[8833] | 1 | /* Everything you wanted to know about your machine and C compiler, |
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| 2 | but didn't know who to ask. */ |
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| 3 | |
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| 4 | #ifndef VERSION |
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| 5 | #define VERSION "4.3" |
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| 6 | #endif |
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| 7 | |
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| 8 | /* Author: Steven Pemberton, CWI, Amsterdam; steven@cwi.nl |
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| 9 | Bugfixes and upgrades gratefully received. |
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| 10 | |
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| 11 | Copyright (c) 1988, 1989, 1990 Steven Pemberton, CWI, Amsterdam. |
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| 12 | All rights reserved. |
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| 13 | |
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| 14 | Changes by Richard Stallman: |
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| 15 | Undef CHAR_BIT, etc., if defined in stdio.h, Richard Stallman, Aug 90. |
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| 16 | In EPROP, avoid a <= old if bad is set, Richard Stallman, May 91. |
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| 17 | Use gstddef.h, not stddef.h, Richard Stallman, Nov 91. |
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| 18 | Don't declare malloc, instead cast the value, Richard Stallman, Nov 91. |
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| 19 | Include sys/types.h before signal.h, Apr 92. |
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| 20 | Support NO_LONG_DOUBLE_IO in f_define and f_rep; new fn fake_f_rep, Apr 92. |
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| 21 | Enclose -f output in #ifndef _FLOAT_H___, Richard Stallman, May 92. |
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| 22 | |
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| 23 | Change by Jim Wilson: |
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| 24 | Add #undef before every #define, Dec 92. |
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| 25 | Use stddef.h not gstddef.h, Mar 94. |
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| 26 | |
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| 27 | Changes by Paul Eggert, installed Feb 93: |
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| 28 | (fake_f_rep): Clear all of u, initially. Make the ints in u unsigned. |
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| 29 | (f_define): Use ordinary constants for long double |
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| 30 | if it's same width as double. Make __convert_long_double_i unsigned. |
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| 31 | Richard Stallman, May 93: |
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| 32 | In F_check, check NO_LONG_DOUBLE_IO. |
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| 33 | |
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| 34 | Changes by Stephen Moshier, installed Sep 93: |
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| 35 | (FPROP): Recognize 80387 or 68881 XFmode format. |
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| 36 | |
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| 37 | |
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| 38 | COMPILING |
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| 39 | With luck and a following wind, just the following will work: |
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| 40 | cc enquire.c -o enquire |
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| 41 | You may get some messages about unreachable code, which you can ignore. |
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| 42 | |
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| 43 | If your compiler doesn't support: add flag: |
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| 44 | signed char (eg pcc) -DNO_SC |
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| 45 | unsigned char -DNO_UC |
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| 46 | unsigned short and long -DNO_UI |
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| 47 | void -DNO_VOID |
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| 48 | signal(), or setjmp/longjmp() -DNO_SIG |
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| 49 | %Lf in printf -DNO_LONG_DOUBLE_IO |
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| 50 | |
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| 51 | Try to compile first with no flags, and see if you get any errors - |
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| 52 | you might be surprised. (Most non-ANSI compilers need -DNO_SC, though.) |
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| 53 | Some compilers need a -f flag for floating point. |
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| 54 | |
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| 55 | Don't use any optimisation flags: the program may not work if you do. |
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| 56 | Though "while (a+1.0-a-1.0 == 0.0)" may look like "while(1)" to an |
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| 57 | optimiser, to a floating-point unit there's a world of difference. |
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| 58 | |
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| 59 | Some compilers offer various flags for different floating point |
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| 60 | modes; it's worth trying all possible combinations of these. |
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| 61 | |
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| 62 | Add -DID=\"name\" if you want the machine/flags identified in the output. |
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| 63 | |
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| 64 | FAULTY COMPILERS |
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| 65 | Because of bugs and/or inadequacies, some compilers need the following |
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| 66 | defines: |
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| 67 | |
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| 68 | If your C preprocessor doesn't have the predefined __FILE__ macro, and |
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| 69 | you don't want to call this file enquire.c but, say, tell.c, add the |
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| 70 | flag -DFILENAME=\"tell.c\" . |
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| 71 | |
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| 72 | Some compilers won't accept the line "#include FILENAME". |
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| 73 | Add flag -DNO_FILE. In that case, this file *must* be called enquire.c. |
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| 74 | |
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| 75 | Some compilers can't cope with "#ifdef __FILE__". Use -DFILENAME= |
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| 76 | or -DNO_FILE as above. |
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| 77 | |
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| 78 | Some naughty compilers define __STDC__, but don't really support it. |
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| 79 | Some define it as 0, in which case we treat it as undefined. |
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| 80 | But if your compiler defines it, and isn't really ANSI C, |
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| 81 | add flag -DNO_STDC. (To those compiler writers: for shame). |
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| 82 | |
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| 83 | Some naughty compilers define __STDC__, but don't have the stddef.h |
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| 84 | include file. Add flag -DNO_STDDEF. |
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| 85 | |
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| 86 | Summary of naughty-compiler flags: |
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| 87 | If your compiler doesn't support: add flag: |
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| 88 | __FILE__ (and you changed the filename) -DFILENAME=\"name.c\" |
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| 89 | #ifdef __FILE__ -DNO_FILE or -DFILENAME=... |
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| 90 | #include FILENAME -DNO_FILE |
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| 91 | __STDC__ (properly) -DNO_STDC |
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| 92 | stddef.h -DNO_STDDEF |
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| 93 | |
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| 94 | Some systems crash when you try to malloc all store. To save users of |
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| 95 | such defective systems too much grief, they may compile with -DNO_MEM, |
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| 96 | which ignores that bit of the code. |
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| 97 | |
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| 98 | While it is not our policy to support defective compilers, pity has been |
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| 99 | taken on people with compilers that can't produce object files bigger than |
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| 100 | 32k (especially since it was an easy addition). Compile the program |
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| 101 | into separate parts like this: |
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| 102 | cc -DSEP -DPASS0 -o p0.o <other flags> enquire.c |
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| 103 | cc -DSEP -DPASS1 -o p1.o <other flags> enquire.c |
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| 104 | cc -DSEP -DPASS2 -o p2.o <other flags> enquire.c |
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| 105 | cc -DSEP -DPASS3 -o p3.o <other flags> enquire.c |
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| 106 | cc -o enquire p0.o p1.o p2.o p3.o |
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| 107 | |
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| 108 | SYSTEM DEPENDENCIES |
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| 109 | You may possibly need to add some calls to signal() for other sorts of |
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| 110 | exception on your machine than SIGFPE, and SIGOVER. See lines beginning |
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| 111 | #ifdef SIGxxx in main() (and communicate the differences to me!). |
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| 112 | |
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| 113 | OUTPUT |
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| 114 | Run without argument to get the information as English text. If run |
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| 115 | with argument -l (e.g. enquire -l), output is a series of #define's for |
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| 116 | the ANSI standard limits.h include file, excluding MB_MAX_CHAR. If run |
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| 117 | with argument -f, output is a series of #define's for the ANSI standard |
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| 118 | float.h include file (according to ANSI C Draft of Dec 7, 1988). |
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| 119 | Flag -v gives verbose output: output includes the English text above |
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| 120 | as C comments. The program exit(0)'s if everything went ok, otherwise |
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| 121 | it exits with a positive number, telling how many problems there were. |
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| 122 | |
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| 123 | VERIFYING THE COMPILER |
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| 124 | If, having produced the float.h and limits.h header files, you want to |
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| 125 | verify that the compiler reads them back correctly (there are a lot of |
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| 126 | boundary cases, of course, like minimum and maximum numbers), you can |
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| 127 | recompile enquire.c with -DVERIFY set (plus the other flags that you used |
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| 128 | when compiling the version that produced the header files). This then |
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| 129 | recompiles the program so that it #includes "limits.h" and "float.h", |
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| 130 | and checks that the constants it finds there are the same as the |
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| 131 | constants it produces. Run the resulting program with enquire -fl. |
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| 132 | Very few compilers have passed without error. |
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| 133 | NB: You *must* recompile with the same compiler and flags, otherwise |
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| 134 | you may get odd results. |
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| 135 | |
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| 136 | You can also use this option if your compiler already has both files, |
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| 137 | and you want to confirm that this program produces the right results. |
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| 138 | |
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| 139 | TROUBLESHOOTING. |
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| 140 | This program is now quite trustworthy, and suspicious and wrong output |
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| 141 | may well be caused by bugs in the compiler, not in the program (however |
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| 142 | of course, this is not guaranteed, and no responsibility can be |
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| 143 | accepted, etc.) |
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| 144 | |
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| 145 | The program only works if overflows are ignored by the C system or |
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| 146 | are catchable with signal(). |
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| 147 | |
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| 148 | If the program fails to run to completion (often with the error message |
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| 149 | "Unexpected signal at point x"), this often turns out to be a bug in the |
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| 150 | C compiler's run-time system. Check what was about to be printed, and |
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| 151 | try to narrow the problem down. |
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| 152 | |
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| 153 | Another possible problem is that you have compiled the program to produce |
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| 154 | loss-of-precision arithmetic traps. The program cannot cope with these, |
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| 155 | and you should re-compile without them. (They should never be the default). |
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| 156 | |
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| 157 | Make sure you compiled with optimisation turned off. |
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| 158 | |
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| 159 | Output preceded by *** WARNING: identifies behaviour of the C system |
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| 160 | deemed incorrect by the program. Likely problems are that printf or |
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| 161 | scanf don't cope properly with certain boundary numbers: this program |
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| 162 | goes to a lot of trouble to calculate its values, and these values |
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| 163 | are mostly boundary numbers. Experience has shown that often printf |
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| 164 | cannot cope with these values, and so in an attempt to increase |
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| 165 | confidence in the output, for each float and double that is printed, |
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| 166 | the printed value is checked by using sscanf to read it back. |
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| 167 | Care is taken that numbers are printed with enough digits to uniquely |
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| 168 | identify them, and therefore that they can be read back identically. |
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| 169 | If the number read back is different, then there is probably a bug in |
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| 170 | printf or sscanf, and the program prints the warning message. |
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| 171 | If the two numbers in the warning look identical, then printf is more |
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| 172 | than likely rounding the last digit(s) incorrectly. To put you at ease |
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| 173 | that the two really are different, the bit patterns of the two numbers |
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| 174 | are also printed. The difference is very likely in the last bit. |
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| 175 | Many scanf's read the minimum double back as 0.0, and similarly cause |
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| 176 | overflow when reading the maximum double. This program quite ruthlessly |
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| 177 | declares all these behaviours faulty. The point is that if you get |
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| 178 | one of these warnings, the output may be wrong, so you should check |
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| 179 | the result carefully if you intend to use the results. Of course, printf |
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| 180 | and sscanf may both be wrong, and cancel each other out, so you should |
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| 181 | check the output carefully anyway. |
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| 182 | |
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| 183 | The warning that "a cast didn't work" refers to cases like this: |
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| 184 | |
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| 185 | float f; |
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| 186 | #define C 1.234567890123456789 |
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| 187 | f= C; |
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| 188 | if (f != (float) C) printf ("Wrong!"); |
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| 189 | |
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| 190 | A faulty compiler will widen f to double and ignore the cast to float, |
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| 191 | and because there is more accuracy in a double than a float, fail to |
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| 192 | recognise that they are the same. In the actual case in point, f and C |
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| 193 | are passed as parameters to a function that discovers they are not equal, |
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| 194 | so it's just possible that the error was in the parameter passing, |
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| 195 | not in the cast (see function Validate()). |
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| 196 | For ANSI C, which has float constants, the error message is "constant has |
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| 197 | wrong precision". |
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| 198 | |
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| 199 | REPORTING PROBLEMS |
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| 200 | If the program doesn't work for you for any reason that can't be |
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| 201 | narrowed down to a problem in the C compiler, or it has to be changed in |
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| 202 | order to get it to compile, or it produces suspicious output (like a very |
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| 203 | low maximum float, for instance), please mail the problem and an example |
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| 204 | of the incorrect output to steven@cwi.nl or ..!hp4nl!cwi.nl!steven, so that |
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| 205 | improvements can be worked into future versions; cwi.nl is the European |
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| 206 | backbone, and is connected to uunet and other fine hosts. |
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| 207 | |
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| 208 | The program tries to catch and diagnose bugs in the compiler/run-time |
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| 209 | system. I would be especially pleased to have reports of failures so |
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| 210 | that I can improve this service. |
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| 211 | |
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| 212 | I apologise unreservedly for the contorted use of the preprocessor... |
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| 213 | |
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| 214 | THE SMALL PRINT |
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| 215 | You may copy and distribute verbatim copies of this source file. |
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| 216 | |
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| 217 | You may modify this source file, and copy and distribute such |
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| 218 | modified versions, provided that you leave the copyright notice |
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| 219 | at the top of the file and also cause the modified file to carry |
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| 220 | prominent notices stating that you changed the files and the date |
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| 221 | of any change; and cause the whole of any work that you distribute |
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| 222 | or publish, that in whole or in part contains or is a derivative of |
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| 223 | this program or any part thereof, to be licensed at no charge to |
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| 224 | all third parties on terms identical to those here. |
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| 225 | |
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| 226 | If you do have a fix to any problem, please send it to me, so that |
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| 227 | other people can have the benefits. |
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| 228 | |
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| 229 | While every effort has been taken to make this program as reliable as |
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| 230 | possible, no responsibility can be taken for the correctness of the |
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| 231 | output, nor suitability for any particular use. |
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| 232 | |
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| 233 | This program is an offshoot of a project funded by public funds. |
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| 234 | If you use this program for research or commercial use (i.e. more |
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| 235 | than just for the fun of knowing about your compiler) mailing a short |
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| 236 | note of acknowledgement may help keep enquire.c supported. |
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| 237 | |
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| 238 | ACKNOWLEDGEMENTS |
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| 239 | Many people have given time and ideas to making this program what it is. |
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| 240 | To all of them thanks, and apologies for not mentioning them by name. |
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| 241 | |
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| 242 | HISTORY |
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| 243 | Originally started as a program to generate configuration constants |
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| 244 | for a large piece of software we were writing, which later took on |
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| 245 | a life of its own... |
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| 246 | 1.0 Length 6658!; end 1984? |
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| 247 | Unix only. Only printed a dozen maximum int/double values. |
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| 248 | 2.0 Length 10535; Spring 1985 |
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| 249 | Prints values as #defines (about 20 of them) |
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| 250 | More extensive floating point, using Cody and Waite |
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| 251 | Handles signals better |
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| 252 | Programs around optimisations |
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| 253 | Handles Cybers |
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| 254 | 3.0 Length 12648; Aug 1987; prints about 42 values |
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| 255 | Added PASS stuff, so treats float as well as double |
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| 256 | 4.0 Length 33891; Feb 1989; prints around 85 values |
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| 257 | First GNU version (for gcc, where they call it hard-params.c) |
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| 258 | Generates float.h and limits.h files |
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| 259 | Handles long double |
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| 260 | Generates warnings for dubious output |
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| 261 | 4.1 Length 47738; April 1989 |
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| 262 | Added VERIFY and TEST |
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| 263 | 4.2 Length 63442; Feb 1990 |
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| 264 | Added SEP |
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| 265 | Fixed eps/epsneg |
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| 266 | Added check for pseudo-unsigned chars |
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| 267 | Added description for each #define output |
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| 268 | Added check for absence of defines during verify |
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| 269 | Added prototypes |
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| 270 | Added NO_STDC and NO_FILE |
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| 271 | Fixed alignments output |
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| 272 | 4.3 Length 75000; Oct 1990; around 114 lines of output |
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| 273 | Function xmalloc defined, Richard Stallman, June 89. |
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| 274 | Alignments computed from member offsets rather than structure sizes, |
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| 275 | Richard Stallman, Oct 89. |
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| 276 | Print whether char* and int* pointers have the same format; |
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| 277 | also char * and function *. |
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| 278 | Update to Draft C version Dec 7, 1988 |
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| 279 | - types of constants produced in limits.h |
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| 280 | (whether to put a U after unsigned shorts and chars and |
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| 281 | whether to output -1024 as (-1023-1)) |
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| 282 | - values of SCHAR_MIN/MAX |
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| 283 | - values of *_EPSILON (not the smallest but the effective smallest) |
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| 284 | Added FILENAME, since standard C doesn't allow #define __FILE__ |
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| 285 | Renamed from config.c to enquire.c |
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| 286 | Added size_t and ptrdiff_t enquiries |
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| 287 | Added promotion enquiries |
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| 288 | Added type checks of #defines |
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| 289 | Added NO_STDDEF |
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| 290 | Changed endian to allow for cases where not all bits are used |
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| 291 | Sanity check for max integrals |
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| 292 | Fixed definition of setjmp for -DNO_SIG |
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| 293 | Moved #define ... 0.0L inside #ifdef STDC, in case some cpp's tokenize |
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| 294 | Added NO_MEM |
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| 295 | */ |
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| 296 | |
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| 297 | /* Set FILENAME to the name of this file */ |
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| 298 | #ifndef FILENAME |
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| 299 | #ifdef NO_FILE |
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| 300 | #define FILENAME "enquire.c" |
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| 301 | #else |
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| 302 | #ifdef __FILE__ /* It's a compiler bug if this fails. Compile with -DNO_FILE */ |
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| 303 | #define FILENAME __FILE__ |
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| 304 | #else |
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| 305 | #define FILENAME "enquire.c" |
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| 306 | #endif /* __FILE__ */ |
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| 307 | #endif /* NO_FILE */ |
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| 308 | #endif /* FILENAME */ |
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| 309 | |
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| 310 | /* If PASS isn't defined, then this is the first pass over this file. */ |
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| 311 | #ifndef PASS |
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| 312 | #ifndef SEP |
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| 313 | #define PASS 1 |
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| 314 | #define PASS0 1 |
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| 315 | #define PASS1 1 |
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| 316 | #endif /* SEP */ |
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| 317 | |
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| 318 | /* A description of the ANSI constants */ |
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| 319 | #define D_CHAR_BIT "Number of bits in a storage unit" |
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| 320 | #define D_CHAR_MAX "Maximum char" |
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| 321 | #define D_CHAR_MIN "Minimum char" |
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| 322 | #define D_SCHAR_MAX "Maximum signed char" |
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| 323 | #define D_SCHAR_MIN "Minimum signed char" |
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| 324 | #define D_UCHAR_MAX "Maximum unsigned char (minimum is always 0)" |
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| 325 | |
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| 326 | #define D_INT_MAX "Maximum %s" |
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| 327 | #define D_INT_MIN "Minimum %s" |
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| 328 | #define D_UINT_MAX "Maximum unsigned %s (minimum is always 0)" |
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| 329 | |
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| 330 | #define D_FLT_ROUNDS "Addition rounds to 0: zero, 1: nearest, 2: +inf, 3: -inf, -1: unknown" |
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| 331 | #define D_FLT_RADIX "Radix of exponent representation" |
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| 332 | #define D_MANT_DIG "Number of base-FLT_RADIX digits in the significand of a %s" |
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| 333 | #define D_DIG "Number of decimal digits of precision in a %s" |
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| 334 | #define D_MIN_EXP "Minimum int x such that FLT_RADIX**(x-1) is a normalised %s" |
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| 335 | #define D_MIN_10_EXP "Minimum int x such that 10**x is a normalised %s" |
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| 336 | #define D_MAX_EXP "Maximum int x such that FLT_RADIX**(x-1) is a representable %s" |
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| 337 | #define D_MAX_10_EXP "Maximum int x such that 10**x is a representable %s" |
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| 338 | #define D_MAX "Maximum %s" |
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| 339 | #define D_EPSILON "Difference between 1.0 and the minimum %s greater than 1.0" |
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| 340 | #define D_MIN "Minimum normalised %s" |
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| 341 | |
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| 342 | /* Procedure just marks the functions that don't return a result */ |
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| 343 | #ifdef NO_VOID |
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| 344 | #define Procedure int |
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| 345 | #else |
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| 346 | #define Procedure void |
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| 347 | #endif |
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| 348 | |
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| 349 | /* Some bad compilers define __STDC__, when they don't support it. |
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| 350 | Compile with -DNO_STDC to get round this. |
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| 351 | */ |
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| 352 | #ifndef NO_STDC |
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| 353 | #ifdef __STDC__ |
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| 354 | #if __STDC__ /* If __STDC__ is 0, assume it isn't supported */ |
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| 355 | #define STDC |
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| 356 | #endif |
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| 357 | #endif |
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| 358 | #endif |
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| 359 | |
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| 360 | /* Stuff different for ANSI C, and old C: |
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| 361 | ARGS and NOARGS are used for function prototypes. |
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| 362 | Volatile is used to reduce the chance of optimisation, |
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| 363 | and to prevent variables being put in registers (when setjmp/longjmp |
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| 364 | wouldn't work as we want) |
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| 365 | Long_double is the longest floating point type available. |
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| 366 | stdc is used in tests like "if (stdc)", which is less ugly than #ifdef. |
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| 367 | U is output after unsigned constants. |
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| 368 | */ |
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| 369 | #ifdef STDC |
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| 370 | |
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| 371 | #define ARGS(x) x |
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| 372 | #define NOARGS (void) |
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| 373 | #define Volatile volatile |
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| 374 | #define Long_double long double |
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| 375 | #define stdc 1 |
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| 376 | #define U "U" |
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| 377 | |
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| 378 | #else /* Old style C */ |
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| 379 | |
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| 380 | #define ARGS(x) () |
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| 381 | #define NOARGS () |
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| 382 | #define Volatile static |
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| 383 | #define Long_double double |
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| 384 | #define stdc 0 |
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| 385 | #define U "" |
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| 386 | |
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| 387 | #endif /* STDC */ |
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| 388 | |
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| 389 | /* include files */ |
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| 390 | #include <stdio.h> |
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| 391 | |
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| 392 | #ifdef STDC |
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| 393 | #ifndef NO_STDDEF |
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| 394 | #include <stddef.h> /* for size_t: if this fails, define NO_STDDEF */ |
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| 395 | #endif |
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| 396 | #endif |
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| 397 | |
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| 398 | #ifdef NO_SIG |
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| 399 | #define jmp_buf int |
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| 400 | #else |
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| 401 | #include <sys/types.h> |
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| 402 | #include <signal.h> |
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| 403 | #include <setjmp.h> |
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| 404 | #endif |
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| 405 | |
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| 406 | /* Kludge around the possibility that <stdio.h> includes <limits.h> */ |
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| 407 | #ifdef CHAR_BIT |
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| 408 | #undef CHAR_BIT |
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| 409 | #undef CHAR_MAX |
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| 410 | #undef CHAR_MIN |
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| 411 | #undef SCHAR_MAX |
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| 412 | #undef SCHAR_MIN |
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| 413 | #undef UCHAR_MAX |
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| 414 | #undef UCHAR_MIN |
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| 415 | #endif |
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| 416 | |
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| 417 | #ifdef VERIFY |
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| 418 | #include "limits.h" |
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| 419 | #include "float.h" |
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| 420 | #endif |
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| 421 | |
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| 422 | #define Vprintf if (V) printf |
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| 423 | #define Unexpected(place) if (setjmp(lab)!=0) croak(place) |
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| 424 | #define fabs(x) (((x)<0.0)?(-x):(x)) |
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| 425 | |
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| 426 | #endif /* PASS */ |
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| 427 | |
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| 428 | #ifdef PASS0 |
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| 429 | |
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| 430 | /* Prototypes for what's to come: */ |
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| 431 | |
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| 432 | int false NOARGS; |
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| 433 | |
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| 434 | #ifdef NO_STDDEF |
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| 435 | char *malloc (); /* Old style prototype */ |
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| 436 | #else |
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| 437 | char *malloc ARGS((size_t size)); |
---|
| 438 | #endif |
---|
| 439 | |
---|
| 440 | Procedure exit ARGS((int status)); |
---|
| 441 | |
---|
| 442 | char *f_rep ARGS((int precision, Long_double val)); |
---|
| 443 | char *fake_f_rep ARGS((char *type, Long_double val)); |
---|
| 444 | |
---|
| 445 | int maximum_int NOARGS; |
---|
| 446 | int cprop NOARGS; |
---|
| 447 | int basic NOARGS; |
---|
| 448 | Procedure sprop NOARGS; |
---|
| 449 | Procedure iprop NOARGS; |
---|
| 450 | Procedure lprop NOARGS; |
---|
| 451 | Procedure usprop NOARGS; |
---|
| 452 | Procedure uiprop NOARGS; |
---|
| 453 | Procedure ulprop NOARGS; |
---|
| 454 | int fprop ARGS((int bits_per_byte)); |
---|
| 455 | int dprop ARGS((int bits_per_byte)); |
---|
| 456 | int ldprop ARGS((int bits_per_byte)); |
---|
| 457 | Procedure efprop ARGS((int fprec, int dprec, int lprec)); |
---|
| 458 | Procedure edprop ARGS((int fprec, int dprec, int lprec)); |
---|
| 459 | Procedure eldprop ARGS((int fprec, int dprec, int lprec)); |
---|
| 460 | |
---|
| 461 | int setmode ARGS((char *s)); |
---|
| 462 | Procedure farewell ARGS((int bugs)); |
---|
| 463 | Procedure describe ARGS((char *description, char *extra)); |
---|
| 464 | Procedure missing ARGS((char *s)); |
---|
| 465 | Procedure fmissing ARGS((char *s)); |
---|
| 466 | Procedure check_defines NOARGS; |
---|
| 467 | Procedure bitpattern ARGS((char *p, unsigned int size)); |
---|
| 468 | int ceil_log ARGS((int base, Long_double x)); |
---|
| 469 | Procedure croak ARGS((int place)); |
---|
| 470 | Procedure eek_a_bug ARGS((char *problem)); |
---|
| 471 | Procedure endian ARGS((int bits_per_byte)); |
---|
| 472 | int exponent ARGS((Long_double x, double *fract, int *exp)); |
---|
| 473 | int floor_log ARGS((int base, Long_double x)); |
---|
| 474 | Procedure f_define ARGS((char *desc, char *extra, char *sort, char *name, |
---|
| 475 | int prec, Long_double val, char *mark)); |
---|
| 476 | Procedure i_define ARGS((char *desc, char *extra, char *sort, char *name, |
---|
| 477 | long val, long lim, long req, char *mark)); |
---|
| 478 | Procedure u_define ARGS((char *desc, char *extra, char *sort, char *name, |
---|
| 479 | unsigned long val, unsigned long req, char *mark)); |
---|
| 480 | |
---|
| 481 | #ifdef NO_SIG /* There's no signal(), or setjmp/longjmp() */ |
---|
| 482 | |
---|
| 483 | /* Dummy routines instead */ |
---|
| 484 | |
---|
| 485 | int setjmp ARGS((int lab)); |
---|
| 486 | |
---|
| 487 | int lab=1; |
---|
| 488 | int setjmp(lab) int lab; { return(0); } |
---|
| 489 | Procedure signal(i, p) int i, (*p)(); {} |
---|
| 490 | |
---|
| 491 | #else |
---|
| 492 | jmp_buf lab; |
---|
| 493 | Procedure overflow(sig) int sig; { /* what to do on over/underflow */ |
---|
| 494 | signal(sig, overflow); |
---|
| 495 | longjmp(lab, 1); |
---|
| 496 | } |
---|
| 497 | |
---|
| 498 | #endif /*NO_SIG*/ |
---|
| 499 | |
---|
| 500 | int V= 0, /* verbose */ |
---|
| 501 | L= 0, /* produce limits.h */ |
---|
| 502 | F= 0, /* produce float.h */ |
---|
| 503 | bugs=0; /* The number of (possible) bugs in the output */ |
---|
| 504 | |
---|
| 505 | char co[4], oc[4]; /* Comment starter and ender symbols */ |
---|
| 506 | |
---|
| 507 | int bits_per_byte; /* the number of bits per unit returned by sizeof() */ |
---|
| 508 | int flt_rounds; /* The calculated value of FLT_ROUNDS */ |
---|
| 509 | int flt_radix; /* The calculated value of FLT_RADIX */ |
---|
| 510 | |
---|
| 511 | #ifdef TEST |
---|
| 512 | /* Set the fp modes on a SUN with 68881 chip, to check that different |
---|
| 513 | rounding modes etc. get properly detected. |
---|
| 514 | Compile with -f68881 for cc, -m68881 for gcc, and with additional flag |
---|
| 515 | -DTEST. Run with additional parameter +hex-number, to set the 68881 mode |
---|
| 516 | register to hex-number |
---|
| 517 | */ |
---|
| 518 | |
---|
| 519 | /* Bits 0x30 = rounding mode */ |
---|
| 520 | #define ROUND_BITS 0x30 |
---|
| 521 | #define TO_NEAREST 0x00 |
---|
| 522 | #define TO_ZERO 0x10 |
---|
| 523 | #define TO_MINUS_INF 0x20 |
---|
| 524 | #define TO_PLUS_INF 0x30 /* The SUN FP user's guide seems to be wrong here */ |
---|
| 525 | |
---|
| 526 | /* Bits 0xc0 = extended rounding */ |
---|
| 527 | #define EXT_BITS 0xc0 |
---|
| 528 | #define ROUND_EXTENDED 0x00 |
---|
| 529 | #define ROUND_SINGLE 0x40 |
---|
| 530 | #define ROUND_DOUBLE 0x80 |
---|
| 531 | |
---|
| 532 | /* Enabled traps */ |
---|
| 533 | #define EXE_INEX1 0x100 |
---|
| 534 | #define EXE_INEX2 0x200 |
---|
| 535 | #define EXE_DZ 0x400 |
---|
| 536 | #define EXE_UNFL 0x800 |
---|
| 537 | #define EXE_OVFL 0x1000 |
---|
| 538 | #define EXE_OPERR 0x2000 |
---|
| 539 | #define EXE_SNAN 0x4000 |
---|
| 540 | #define EXE_BSUN 0x8000 |
---|
| 541 | |
---|
| 542 | /* Only used for testing, on a Sun with 68881 chip */ |
---|
| 543 | /* Print the FP mode */ |
---|
| 544 | printmode(new) unsigned new; { |
---|
| 545 | fpmode_(&new); |
---|
| 546 | printf("New fp mode:\n"); |
---|
| 547 | printf(" Round toward "); |
---|
| 548 | switch (new & ROUND_BITS) { |
---|
| 549 | case TO_NEAREST: printf("nearest"); break; |
---|
| 550 | case TO_ZERO: printf("zero"); break; |
---|
| 551 | case TO_MINUS_INF: printf("minus infinity"); break; |
---|
| 552 | case TO_PLUS_INF: printf("plus infinity"); break; |
---|
| 553 | default: printf("???"); break; |
---|
| 554 | } |
---|
| 555 | |
---|
| 556 | printf("\n Extended rounding precision: "); |
---|
| 557 | |
---|
| 558 | switch (new & EXT_BITS) { |
---|
| 559 | case ROUND_EXTENDED: printf("extended"); break; |
---|
| 560 | case ROUND_SINGLE: printf("single"); break; |
---|
| 561 | case ROUND_DOUBLE: printf("double"); break; |
---|
| 562 | default: printf("???"); break; |
---|
| 563 | } |
---|
| 564 | |
---|
| 565 | printf("\n Enabled exceptions:"); |
---|
| 566 | if (new & (unsigned) EXE_INEX1) printf(" inex1"); |
---|
| 567 | if (new & (unsigned) EXE_INEX2) printf(" inex2"); |
---|
| 568 | if (new & (unsigned) EXE_DZ) printf(" dz"); |
---|
| 569 | if (new & (unsigned) EXE_UNFL) printf(" unfl"); |
---|
| 570 | if (new & (unsigned) EXE_OVFL) printf(" ovfl"); |
---|
| 571 | if (new & (unsigned) EXE_OPERR) printf(" operr"); |
---|
| 572 | if (new & (unsigned) EXE_SNAN) printf(" snan"); |
---|
| 573 | if (new & (unsigned) EXE_BSUN) printf(" bsun"); |
---|
| 574 | printf("\n"); |
---|
| 575 | } |
---|
| 576 | |
---|
| 577 | /* Only used for testing, on a Sun with 68881 chip */ |
---|
| 578 | /* Set the FP mode */ |
---|
| 579 | int setmode(s) char *s; { |
---|
| 580 | unsigned mode=0, dig; |
---|
| 581 | char c; |
---|
| 582 | |
---|
| 583 | while (*s) { |
---|
| 584 | c= *s++; |
---|
| 585 | if (c>='0' && c<='9') dig= c-'0'; |
---|
| 586 | else if (c>='a' && c<='f') dig= c-'a'+10; |
---|
| 587 | else if (c>='A' && c<='F') dig= c-'A'+10; |
---|
| 588 | else return 1; |
---|
| 589 | mode= mode<<4 | dig; |
---|
| 590 | } |
---|
| 591 | printmode(mode); |
---|
| 592 | return 0; |
---|
| 593 | } |
---|
| 594 | #else |
---|
| 595 | /* ARGSUSED */ |
---|
| 596 | int setmode(s) char *s; { |
---|
| 597 | fprintf(stderr, "Can't set mode: not compiled with TEST\n"); |
---|
| 598 | return(1); |
---|
| 599 | } |
---|
| 600 | #endif |
---|
| 601 | |
---|
| 602 | Procedure farewell(bugs) int bugs; { |
---|
| 603 | if (bugs == 0) exit(0); |
---|
| 604 | printf("\n%sFor hints on dealing with the ", co); |
---|
| 605 | if (bugs == 1) printf("problem"); |
---|
| 606 | else printf("%d problems", bugs); |
---|
| 607 | printf(" above\n see the section 'TROUBLESHOOTING' in the file "); |
---|
| 608 | printf("%s%s\n", FILENAME, oc); |
---|
| 609 | exit(bugs); |
---|
| 610 | } |
---|
| 611 | |
---|
| 612 | /* The program has received a signal where it wasn't expecting one */ |
---|
| 613 | Procedure croak(place) int place; { |
---|
| 614 | printf("*** Unexpected signal at point %d\n", place); |
---|
| 615 | farewell(bugs+1); /* An exit isn't essential here, but avoids loops */ |
---|
| 616 | } |
---|
| 617 | |
---|
| 618 | /* This is here in case alloca.c is used, which calls this. */ |
---|
| 619 | char *xmalloc(size) unsigned size; { |
---|
| 620 | char *value = (char *)malloc(size); |
---|
| 621 | if (value == 0) { |
---|
| 622 | fprintf(stderr, "Virtual memory exceeded\n"); |
---|
| 623 | exit(bugs+1); |
---|
| 624 | } |
---|
| 625 | return value; |
---|
| 626 | } |
---|
| 627 | |
---|
| 628 | int maxint; |
---|
| 629 | |
---|
| 630 | int maximum_int() { |
---|
| 631 | /* Find the maximum integer */ |
---|
| 632 | Volatile int newi, int_max, two=2; |
---|
| 633 | |
---|
| 634 | /* Calculate maxint ***********************************/ |
---|
| 635 | /* Calculate 2**n-1 until overflow - then use the previous value */ |
---|
| 636 | |
---|
| 637 | newi=1; int_max=0; |
---|
| 638 | |
---|
| 639 | if (setjmp(lab)==0) { /* Yields int_max */ |
---|
| 640 | while(newi>int_max) { |
---|
| 641 | int_max=newi; |
---|
| 642 | newi=newi*two+1; |
---|
| 643 | } |
---|
| 644 | } |
---|
| 645 | Unexpected(0); |
---|
| 646 | return int_max; |
---|
| 647 | } |
---|
| 648 | |
---|
| 649 | int main(argc, argv) int argc; char *argv[]; { |
---|
| 650 | int dprec, fprec, lprec; |
---|
| 651 | int i; char *s; int bad; |
---|
| 652 | |
---|
| 653 | #ifdef SIGFPE |
---|
| 654 | signal(SIGFPE, overflow); |
---|
| 655 | #endif |
---|
| 656 | #ifdef SIGOVER |
---|
| 657 | signal(SIGOVER, overflow); |
---|
| 658 | #endif |
---|
| 659 | /* Add more calls as necessary */ |
---|
| 660 | |
---|
| 661 | Unexpected(1); |
---|
| 662 | |
---|
| 663 | bad=0; |
---|
| 664 | for (i=1; i < argc; i++) { |
---|
| 665 | s= argv[i]; |
---|
| 666 | if (*s == '-') { |
---|
| 667 | s++; |
---|
| 668 | while (*s) { |
---|
| 669 | switch (*(s++)) { |
---|
| 670 | case 'v': V=1; break; |
---|
| 671 | case 'l': L=1; break; |
---|
| 672 | case 'f': F=1; break; |
---|
| 673 | default: bad=1; break; |
---|
| 674 | } |
---|
| 675 | } |
---|
| 676 | } else if (*s == '+') { |
---|
| 677 | s++; |
---|
| 678 | bad= setmode(s); |
---|
| 679 | } else bad= 1; |
---|
| 680 | } |
---|
| 681 | if (bad) { |
---|
| 682 | fprintf(stderr, |
---|
| 683 | "Usage: %s [-vlf]\n v=Verbose l=Limits.h f=Float.h\n", |
---|
| 684 | argv[0]); |
---|
| 685 | exit(1); |
---|
| 686 | } |
---|
| 687 | if (L || F) { |
---|
| 688 | co[0]= '/'; oc[0]= ' '; |
---|
| 689 | co[1]= '*'; oc[1]= '*'; |
---|
| 690 | co[2]= ' '; oc[2]= '/'; |
---|
| 691 | co[3]= '\0'; oc[3]= '\0'; |
---|
| 692 | } else { |
---|
| 693 | co[0]= '\0'; oc[0]= '\0'; |
---|
| 694 | V=1; |
---|
| 695 | } |
---|
| 696 | |
---|
| 697 | if (L) printf("%slimits.h%s\n", co, oc); |
---|
| 698 | if (F) printf("%sfloat.h%s\n", co, oc); |
---|
| 699 | if (F) { |
---|
| 700 | printf ("#ifndef _FLOAT_H___\n"); |
---|
| 701 | printf ("#define _FLOAT_H___\n"); |
---|
| 702 | } |
---|
| 703 | #ifdef ID |
---|
| 704 | printf("%sProduced on %s by enquire version %s, CWI, Amsterdam%s\n", |
---|
| 705 | co, ID, VERSION, oc); |
---|
| 706 | #else |
---|
| 707 | printf("%sProduced by enquire version %s, CWI, Amsterdam%s\n", |
---|
| 708 | co, VERSION, oc); |
---|
| 709 | #endif |
---|
| 710 | |
---|
| 711 | #ifdef VERIFY |
---|
| 712 | printf("%sVerification phase%s\n", co, oc); |
---|
| 713 | #endif |
---|
| 714 | |
---|
| 715 | #ifdef NO_SIG |
---|
| 716 | Vprintf("%sCompiled without signal(): %s%s\n", |
---|
| 717 | co, |
---|
| 718 | "there's nothing that can be done if overflow occurs", |
---|
| 719 | oc); |
---|
| 720 | #endif |
---|
| 721 | #ifdef NO_SC |
---|
| 722 | Vprintf("%sCompiled without signed char%s\n", co, oc); |
---|
| 723 | #endif |
---|
| 724 | #ifdef NO_UC |
---|
| 725 | Vprintf("%Compiled without unsigned char%s\n", co, oc); |
---|
| 726 | #endif |
---|
| 727 | #ifdef NO_UI |
---|
| 728 | Vprintf("%Compiled without unsigned short or long%s\n", co, oc); |
---|
| 729 | #endif |
---|
| 730 | #ifdef __STDC__ |
---|
| 731 | Vprintf("%sCompiler claims to be ANSI C level %d%s\n", |
---|
| 732 | co, __STDC__, oc); |
---|
| 733 | #else |
---|
| 734 | Vprintf("%sCompiler does not claim to be ANSI C%s\n", co, oc); |
---|
| 735 | #endif |
---|
| 736 | printf("\n"); |
---|
| 737 | check_defines(); |
---|
| 738 | |
---|
| 739 | maxint= maximum_int(); |
---|
| 740 | bits_per_byte= basic(); |
---|
| 741 | Vprintf("\n"); |
---|
| 742 | if (F||V) { |
---|
| 743 | fprec= fprop(bits_per_byte); |
---|
| 744 | dprec= dprop(bits_per_byte); |
---|
| 745 | lprec= ldprop(bits_per_byte); |
---|
| 746 | efprop(fprec, dprec, lprec); |
---|
| 747 | edprop(fprec, dprec, lprec); |
---|
| 748 | eldprop(fprec, dprec, lprec); |
---|
| 749 | } |
---|
| 750 | #ifndef NO_MEM |
---|
| 751 | if (V) { |
---|
| 752 | unsigned int size; |
---|
| 753 | long total; |
---|
| 754 | /* An extra goody: the approximate amount of data-space */ |
---|
| 755 | /* Allocate store until no more available */ |
---|
| 756 | /* Different implementations have a different argument type |
---|
| 757 | to malloc. Here we assume that it's the same type as |
---|
| 758 | that which sizeof() returns */ |
---|
| 759 | size=1<<((bits_per_byte*sizeof(int))-2); |
---|
| 760 | total=0; |
---|
| 761 | while (size!=0) { |
---|
| 762 | while ( malloc((false()?sizeof(int):size)) != |
---|
| 763 | (char *)NULL |
---|
| 764 | ) { |
---|
| 765 | total+=(size/2); |
---|
| 766 | } |
---|
| 767 | size/=2; |
---|
| 768 | } |
---|
| 769 | |
---|
| 770 | Vprintf("%sMemory mallocatable ~= %ld Kbytes%s\n", |
---|
| 771 | co, (total+511)/512, oc); |
---|
| 772 | } |
---|
| 773 | #endif |
---|
| 774 | if (F) { |
---|
| 775 | printf ("#endif %s _FLOAT_H___%s\n", co, oc); |
---|
| 776 | } |
---|
| 777 | farewell(bugs); |
---|
| 778 | return bugs; /* To keep compilers and lint happy */ |
---|
| 779 | } |
---|
| 780 | |
---|
| 781 | Procedure eek_a_bug(problem) char *problem; { |
---|
| 782 | /* The program has discovered a problem */ |
---|
| 783 | printf("\n%s*** WARNING: %s%s\n", co, problem, oc); |
---|
| 784 | bugs++; |
---|
| 785 | } |
---|
| 786 | |
---|
| 787 | Procedure describe(description, extra) char *description, *extra; { |
---|
| 788 | /* Produce the description for a #define */ |
---|
| 789 | printf(" %s", co); |
---|
| 790 | printf(description, extra); |
---|
| 791 | printf("%s\n", oc); |
---|
| 792 | } |
---|
| 793 | |
---|
| 794 | Procedure i_define(desc, extra, sort, name, val, lim, req, mark) |
---|
| 795 | char *desc, *extra, *sort, *name; long val, lim, req; char *mark; { |
---|
| 796 | /* Produce a #define for a signed int type */ |
---|
| 797 | describe(desc, extra); |
---|
| 798 | printf("#undef %s%s\n", sort, name); |
---|
| 799 | if (val >= 0) { |
---|
| 800 | printf("#define %s%s %ld%s\n", sort, name, val, mark); |
---|
| 801 | } else if (val + lim < 0) { |
---|
| 802 | /* We may not produce a constant like -1024 if the max |
---|
| 803 | allowable value is 1023. It has then to be output as |
---|
| 804 | -1023-1. lim is the max allowable value. */ |
---|
| 805 | printf("#define %s%s (%ld%s%ld%s)\n", |
---|
| 806 | sort, name, -lim, mark, val+lim, mark); |
---|
| 807 | } else { |
---|
| 808 | printf("#define %s%s (%ld%s)\n", sort, name, val, mark); |
---|
| 809 | } |
---|
| 810 | /* If VERIFY is not set, val and req are just the same value; |
---|
| 811 | if it is set, val is the value as calculated, and req is |
---|
| 812 | the #defined constant |
---|
| 813 | */ |
---|
| 814 | if (val != req) { |
---|
| 815 | printf("%s*** Verify failed for above #define!\n", co); |
---|
| 816 | printf(" Compiler has %ld for value%s\n\n", req, oc); |
---|
| 817 | bugs++; |
---|
| 818 | } |
---|
| 819 | Vprintf("\n"); |
---|
| 820 | } |
---|
| 821 | |
---|
| 822 | Procedure u_define(desc, extra, sort, name, val, req, mark) |
---|
| 823 | char *desc, *extra, *sort, *name; unsigned long val, req; char *mark; { |
---|
| 824 | /* Produce a #define for an unsigned value */ |
---|
| 825 | describe(desc, extra); |
---|
| 826 | printf("#undef %s%s\n", sort, name); |
---|
| 827 | printf("#define %s%s %lu%s%s\n", sort, name, val, U, mark); |
---|
| 828 | if (val != req) { |
---|
| 829 | printf("%s*** Verify failed for above #define!\n", co); |
---|
| 830 | printf(" Compiler has %lu for value%s\n\n", req, oc); |
---|
| 831 | bugs++; |
---|
| 832 | } |
---|
| 833 | Vprintf("\n"); |
---|
| 834 | } |
---|
| 835 | |
---|
| 836 | Procedure f_define(desc, extra, sort, name, precision, val, mark) |
---|
| 837 | char *desc, *extra, *sort, *name; int precision; |
---|
| 838 | Long_double val; char *mark; { |
---|
| 839 | /* Produce a #define for a float/double/long double */ |
---|
| 840 | describe(desc, extra); |
---|
| 841 | printf ("#undef %s%s\n", sort, name); |
---|
| 842 | if (stdc) { |
---|
| 843 | #ifdef NO_LONG_DOUBLE_IO |
---|
| 844 | static int union_defined = 0; |
---|
| 845 | if (sizeof(double) != sizeof(Long_double) |
---|
| 846 | && !strcmp(sort, "LDBL")) { |
---|
| 847 | if (!union_defined) { |
---|
| 848 | printf("#ifndef __LDBL_UNION__\n"); |
---|
| 849 | printf("#define __LDBL_UNION__\n"); |
---|
| 850 | printf("union __convert_long_double {\n"); |
---|
| 851 | printf(" unsigned __convert_long_double_i[4];\n"); |
---|
| 852 | printf(" long double __convert_long_double_d;\n"); |
---|
| 853 | printf("};\n"); |
---|
| 854 | printf("#endif\n"); |
---|
| 855 | union_defined = 1; |
---|
| 856 | } |
---|
| 857 | printf("#define %s%s %s\n", |
---|
| 858 | sort, name, fake_f_rep("long double", val)); |
---|
| 859 | } else { |
---|
| 860 | printf("#define %s%s %s%s\n", |
---|
| 861 | sort, name, f_rep(precision, val), mark); |
---|
| 862 | } |
---|
| 863 | #else |
---|
| 864 | printf("#define %s%s %s%s\n", |
---|
| 865 | sort, name, f_rep(precision, val), mark); |
---|
| 866 | #endif |
---|
| 867 | } else if (*mark == 'F') { |
---|
| 868 | /* non-ANSI C has no float constants, so cast the constant */ |
---|
| 869 | printf("#define %s%s ((float)%s)\n", |
---|
| 870 | sort, name, f_rep(precision, val)); |
---|
| 871 | } else { |
---|
| 872 | printf("#define %s%s %s\n", sort, name, f_rep(precision, val)); |
---|
| 873 | } |
---|
| 874 | Vprintf("\n"); |
---|
| 875 | } |
---|
| 876 | |
---|
| 877 | int floor_log(base, x) int base; Long_double x; { |
---|
| 878 | /* return floor(log base(x)) */ |
---|
| 879 | int r=0; |
---|
| 880 | while (x>=base) { r++; x/=base; } |
---|
| 881 | return r; |
---|
| 882 | } |
---|
| 883 | |
---|
| 884 | int ceil_log(base, x) int base; Long_double x; { |
---|
| 885 | int r=0; |
---|
| 886 | while (x>1.0) { r++; x/=base; } |
---|
| 887 | return r; |
---|
| 888 | } |
---|
| 889 | |
---|
| 890 | int exponent(x, fract, exp) Long_double x; double *fract; int *exp; { |
---|
| 891 | /* Split x into a fraction and a power of ten; |
---|
| 892 | returns 0 if x is unusable, 1 otherwise. |
---|
| 893 | Only used for error messages about faulty output. |
---|
| 894 | */ |
---|
| 895 | int r=0, neg=0; |
---|
| 896 | Long_double old; |
---|
| 897 | *fract=0.0; *exp=0; |
---|
| 898 | if (x<0.0) { |
---|
| 899 | x= -x; |
---|
| 900 | neg= 1; |
---|
| 901 | } |
---|
| 902 | if (x==0.0) return 1; |
---|
| 903 | if (x>=10.0) { |
---|
| 904 | while (x>=10.0) { |
---|
| 905 | old=x; r++; x/=10.0; |
---|
| 906 | if (old==x) return 0; |
---|
| 907 | } |
---|
| 908 | } else { |
---|
| 909 | while (x<1.0) { |
---|
| 910 | old=x; r--; x*=10.0; |
---|
| 911 | if (old==x) return 0; |
---|
| 912 | } |
---|
| 913 | } |
---|
| 914 | if (neg) *fract= (double) -x; |
---|
| 915 | else *fract=(double) x; |
---|
| 916 | *exp=r; |
---|
| 917 | return 1; |
---|
| 918 | } |
---|
| 919 | |
---|
| 920 | /* Print a value of type TYPE with value VAL, |
---|
| 921 | assuming that sprintf can't handle this type properly (without truncation). |
---|
| 922 | We create an expression that uses type casting to create the value from |
---|
| 923 | a bit pattern. */ |
---|
| 924 | |
---|
| 925 | char *fake_f_rep(type, val) char *type; Long_double val; { |
---|
| 926 | static char buf[1024]; |
---|
| 927 | union { unsigned int i[4]; Long_double ld;} u; |
---|
| 928 | u.i[0] = u.i[1] = u.i[2] = u.i[3] = 0; |
---|
| 929 | u.ld = val; |
---|
| 930 | sprintf(buf, "(__extension__ ((union __convert_long_double) {0x%x, 0x%x, 0x%x, 0x%x}).__convert_long_double_d)", |
---|
| 931 | u.i[0], u.i[1], u.i[2], u.i[3]); |
---|
| 932 | return buf; |
---|
| 933 | } |
---|
| 934 | |
---|
| 935 | char *f_rep(precision, val) int precision; Long_double val; { |
---|
| 936 | /* Return the floating representation of val */ |
---|
| 937 | static char buf[1024]; |
---|
| 938 | #ifdef NO_LONG_DOUBLE_IO |
---|
| 939 | if (1) |
---|
| 940 | #else |
---|
| 941 | if (sizeof(double) == sizeof(Long_double)) |
---|
| 942 | #endif |
---|
| 943 | { |
---|
| 944 | double d = val; |
---|
| 945 | /* Assume they're the same, and use non-stdc format */ |
---|
| 946 | /* This is for stdc compilers using non-stdc libraries */ |
---|
| 947 | sprintf(buf, "%.*e", precision, d); |
---|
| 948 | } else { |
---|
| 949 | /* It had better support Le then */ |
---|
| 950 | sprintf(buf, "%.*Le", precision, val); |
---|
| 951 | } |
---|
| 952 | return buf; |
---|
| 953 | } |
---|
| 954 | |
---|
| 955 | Procedure bitpattern(p, size) char *p; unsigned int size; { |
---|
| 956 | /* Printf the bit-pattern of p */ |
---|
| 957 | char c; |
---|
| 958 | int i, j; |
---|
| 959 | |
---|
| 960 | for (i=1; i<=size; i++) { |
---|
| 961 | c= *p; |
---|
| 962 | p++; |
---|
| 963 | for (j=bits_per_byte-1; j>=0; j--) |
---|
| 964 | printf("%c", (c>>j)&1 ? '1' : '0'); |
---|
| 965 | if (i!=size) printf(" "); |
---|
| 966 | } |
---|
| 967 | } |
---|
| 968 | |
---|
| 969 | #define Order(x, px, mode)\ |
---|
| 970 | printf("%s%s ", co, mode); for (i=0; i<sizeof(x); i++) px[i]= ab[i]; \ |
---|
| 971 | for (i=1; i<=sizeof(x); i++) { c=((x>>(bits_per_byte*(sizeof(x)-i)))&mask);\ |
---|
| 972 | putchar(c==0 ? '?' : (char)c); }\ |
---|
| 973 | printf("%s\n", oc); |
---|
| 974 | |
---|
| 975 | Procedure endian(bits_per_byte) int bits_per_byte; { |
---|
| 976 | /* Printf the byte-order used on this machine */ |
---|
| 977 | /*unsigned*/ short s=0; |
---|
| 978 | /*unsigned*/ int j=0; |
---|
| 979 | /*unsigned*/ long l=0; |
---|
| 980 | |
---|
| 981 | char *ps= (char *) &s, |
---|
| 982 | *pj= (char *) &j, |
---|
| 983 | *pl= (char *) &l, |
---|
| 984 | *ab= "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
---|
| 985 | unsigned int mask, i, c; |
---|
| 986 | |
---|
| 987 | mask=0; |
---|
| 988 | for (i=1; i<=(unsigned)bits_per_byte; i++) mask= (mask<<1)|1; |
---|
| 989 | |
---|
| 990 | if (V) { |
---|
| 991 | printf("%sCHARACTER ORDER%s\n", co, oc); |
---|
| 992 | Order(s, ps, "short:"); |
---|
| 993 | Order(j, pj, "int: "); |
---|
| 994 | Order(l, pl, "long: "); |
---|
| 995 | } |
---|
| 996 | } |
---|
| 997 | |
---|
| 998 | Procedure missing(s) char *s; { |
---|
| 999 | printf("%s*** #define %s missing from limits.h%s\n", co, s, oc); |
---|
| 1000 | bugs++; |
---|
| 1001 | } |
---|
| 1002 | |
---|
| 1003 | Procedure fmissing(s) char *s; { |
---|
| 1004 | printf("%s*** #define %s missing from float.h%s\n", co, s, oc); |
---|
| 1005 | bugs++; |
---|
| 1006 | } |
---|
| 1007 | |
---|
| 1008 | /* To try and fool optimisers */ |
---|
| 1009 | int false() { return 0; } |
---|
| 1010 | |
---|
| 1011 | #define Promoted(x) (false()?(x):(-1)) |
---|
| 1012 | #define is_signed(x) (Promoted(x) < 0) |
---|
| 1013 | #define sign_of(x) ((x)?"signed":"unsigned") |
---|
| 1014 | #define Signed 1 |
---|
| 1015 | #define Unsigned 0 |
---|
| 1016 | #define sgn(x) ((is_signed(x))?Signed:Unsigned) |
---|
| 1017 | |
---|
| 1018 | #define showtype(t, x) Vprintf("%s%s %s %s%s\n", co, t, sign_of(is_signed(x)), type_of(sizeof(x)), oc) |
---|
| 1019 | |
---|
| 1020 | char *type_of(x) int x; { |
---|
| 1021 | if (x == sizeof(char)) { |
---|
| 1022 | if (sizeof(char) == sizeof(int)) return "char/short/int"; |
---|
| 1023 | if (sizeof(char) == sizeof(short)) return "char/short"; |
---|
| 1024 | return "char"; |
---|
| 1025 | } |
---|
| 1026 | if (x == sizeof(short)) { |
---|
| 1027 | if (sizeof(short) == sizeof(int)) return "short/int"; |
---|
| 1028 | return "short"; |
---|
| 1029 | } |
---|
| 1030 | if (x == sizeof(int)) { |
---|
| 1031 | if (sizeof(int) == sizeof(long)) return "int/long"; |
---|
| 1032 | return "int"; |
---|
| 1033 | } |
---|
| 1034 | if (x == sizeof(long)) return "long"; |
---|
| 1035 | return "unknown-type"; |
---|
| 1036 | } |
---|
| 1037 | |
---|
| 1038 | char *ftype_of(x) int x; { |
---|
| 1039 | if (x == sizeof(float)) { |
---|
| 1040 | return "float"; |
---|
| 1041 | } |
---|
| 1042 | if (x == sizeof(double)) { |
---|
| 1043 | if (sizeof(double) == sizeof(Long_double)) |
---|
| 1044 | return "(long)double"; |
---|
| 1045 | return "double"; |
---|
| 1046 | } |
---|
| 1047 | if (x == sizeof(Long_double)) { |
---|
| 1048 | return "long double"; |
---|
| 1049 | } |
---|
| 1050 | return "unknown-type"; |
---|
| 1051 | } |
---|
| 1052 | |
---|
| 1053 | Procedure typerr(name, esign, esize, sign, size) |
---|
| 1054 | char *name; int esign, esize, sign, size; |
---|
| 1055 | { |
---|
| 1056 | Vprintf("*** %s has wrong type: expected %s %s, found %s %s\n", |
---|
| 1057 | name, sign_of(esign), type_of(esize), |
---|
| 1058 | sign_of(sign), type_of(size)); |
---|
| 1059 | } |
---|
| 1060 | |
---|
| 1061 | Procedure ftyperr(name, esize, size) char *name; int esize, size; { |
---|
| 1062 | Vprintf("*** %s has wrong type: expected %s, found %s\n", |
---|
| 1063 | name, ftype_of(esize), ftype_of(size)); |
---|
| 1064 | } |
---|
| 1065 | |
---|
| 1066 | int promotions() { |
---|
| 1067 | int si = 0; long sl = 0; |
---|
| 1068 | unsigned int ui; unsigned long ul; |
---|
| 1069 | short ss; unsigned short us; |
---|
| 1070 | |
---|
| 1071 | Vprintf("\n%sPROMOTIONS%s\n", co, oc); |
---|
| 1072 | |
---|
| 1073 | if ( |
---|
| 1074 | /* Possible warnings here; no problem */ |
---|
| 1075 | (sizeof(Promoted(si)) != sizeof(int)) || |
---|
| 1076 | (sizeof(Promoted(sl)) != sizeof(long)) || |
---|
| 1077 | (sizeof(Promoted(ss)) != sizeof(int)) || |
---|
| 1078 | (sizeof(Promoted(ui)) != sizeof(int)) || |
---|
| 1079 | (sizeof(Promoted(ul)) != sizeof(long)) || |
---|
| 1080 | (sizeof(Promoted(us)) != sizeof(int)) || |
---|
| 1081 | is_signed(ui) || is_signed(ul) || |
---|
| 1082 | !is_signed(si) || !is_signed(sl) |
---|
| 1083 | ) |
---|
| 1084 | { |
---|
| 1085 | eek_a_bug("promotions don't work properly in conditional expressions\n"); |
---|
| 1086 | } |
---|
| 1087 | |
---|
| 1088 | showtype("unsigned short promotes to", Promoted((unsigned short)0)); |
---|
| 1089 | showtype("long+unsigned gives", sl+ui); |
---|
| 1090 | return 0; |
---|
| 1091 | } |
---|
| 1092 | |
---|
| 1093 | #define checktype(x, n, s, t) if((sgn(x)!=s)||(sizeof(x)!=sizeof(t))) typerr(n, s, sizeof(t), sign_of(x), sizeof(x)); |
---|
| 1094 | |
---|
| 1095 | #define fchecktype(x, n, t) if (sizeof(x) != sizeof(t)) ftyperr(n, sizeof(x), sizeof(t)); |
---|
| 1096 | |
---|
| 1097 | Procedure check_defines() { |
---|
| 1098 | /* ensure that all #defines are present and have the correct type */ |
---|
| 1099 | #ifdef VERIFY |
---|
| 1100 | int usign; |
---|
| 1101 | |
---|
| 1102 | #ifdef NO_UI |
---|
| 1103 | usign= Signed; |
---|
| 1104 | #else |
---|
| 1105 | /* Implementations promote unsigned short differently */ |
---|
| 1106 | usign= is_signed((unsigned short)0); |
---|
| 1107 | #endif |
---|
| 1108 | |
---|
| 1109 | if (L) { |
---|
| 1110 | #ifdef CHAR_BIT |
---|
| 1111 | checktype(CHAR_BIT, "CHAR_BIT", Signed, int); |
---|
| 1112 | #else |
---|
| 1113 | missing("CHAR_BIT"); |
---|
| 1114 | #endif |
---|
| 1115 | #ifdef CHAR_MAX |
---|
| 1116 | checktype(CHAR_MAX, "CHAR_MAX", Signed, int); |
---|
| 1117 | #else |
---|
| 1118 | missing("CHAR_MAX"); |
---|
| 1119 | #endif |
---|
| 1120 | #ifdef CHAR_MIN |
---|
| 1121 | checktype(CHAR_MIN, "CHAR_MIN", Signed, int); |
---|
| 1122 | #else |
---|
| 1123 | missing("CHAR_MIN"); |
---|
| 1124 | #endif |
---|
| 1125 | #ifdef SCHAR_MAX |
---|
| 1126 | checktype(SCHAR_MAX, "SCHAR_MAX", Signed, int); |
---|
| 1127 | #else |
---|
| 1128 | missing("SCHAR_MAX"); |
---|
| 1129 | #endif |
---|
| 1130 | #ifdef SCHAR_MIN |
---|
| 1131 | checktype(SCHAR_MIN, "SCHAR_MIN", Signed, int); |
---|
| 1132 | #else |
---|
| 1133 | missing("SCHAR_MIN"); |
---|
| 1134 | #endif |
---|
| 1135 | #ifdef UCHAR_MAX |
---|
| 1136 | checktype(UCHAR_MAX, "UCHAR_MAX", Signed, int); |
---|
| 1137 | #else |
---|
| 1138 | missing("UCHAR_MAX"); |
---|
| 1139 | #endif |
---|
| 1140 | #ifdef SHRT_MAX |
---|
| 1141 | checktype(SHRT_MAX, "SHRT_MAX", Signed, int); |
---|
| 1142 | #else |
---|
| 1143 | missing("SHRT_MAX"); |
---|
| 1144 | #endif |
---|
| 1145 | #ifdef SHRT_MIN |
---|
| 1146 | checktype(SHRT_MIN, "SHRT_MIN", Signed, int); |
---|
| 1147 | #else |
---|
| 1148 | missing("SHRT_MIN"); |
---|
| 1149 | #endif |
---|
| 1150 | #ifdef INT_MAX |
---|
| 1151 | checktype(INT_MAX, "INT_MAX", Signed, int); |
---|
| 1152 | #else |
---|
| 1153 | missing("INT_MAX"); |
---|
| 1154 | #endif |
---|
| 1155 | #ifdef INT_MIN |
---|
| 1156 | checktype(INT_MIN, "INT_MIN", Signed, int); |
---|
| 1157 | #else |
---|
| 1158 | missing("INT_MIN"); |
---|
| 1159 | #endif |
---|
| 1160 | #ifdef LONG_MAX |
---|
| 1161 | checktype(LONG_MAX, "LONG_MAX", Signed, long); |
---|
| 1162 | #else |
---|
| 1163 | missing("LONG_MAX"); |
---|
| 1164 | #endif |
---|
| 1165 | #ifdef LONG_MIN |
---|
| 1166 | checktype(LONG_MIN, "LONG_MIN", Signed, long); |
---|
| 1167 | #else |
---|
| 1168 | missing("LONG_MIN"); |
---|
| 1169 | #endif |
---|
| 1170 | #ifdef USHRT_MAX |
---|
| 1171 | checktype(USHRT_MAX, "USHRT_MAX", usign, int); |
---|
| 1172 | #else |
---|
| 1173 | missing("USHRT_MAX"); |
---|
| 1174 | #endif |
---|
| 1175 | #ifdef UINT_MAX |
---|
| 1176 | checktype(UINT_MAX, "UINT_MAX", Unsigned, int); |
---|
| 1177 | #else |
---|
| 1178 | missing("UINT_MAX"); |
---|
| 1179 | #endif |
---|
| 1180 | #ifdef ULONG_MAX |
---|
| 1181 | checktype(ULONG_MAX, "ULONG_MAX", Unsigned, long); |
---|
| 1182 | #else |
---|
| 1183 | missing("ULONG_MAX"); |
---|
| 1184 | #endif |
---|
| 1185 | } /* if (L) */ |
---|
| 1186 | |
---|
| 1187 | if (F) { |
---|
| 1188 | #ifdef FLT_RADIX |
---|
| 1189 | checktype(FLT_RADIX, "FLT_RADIX", Signed, int); |
---|
| 1190 | #else |
---|
| 1191 | fmissing("FLT_RADIX"); |
---|
| 1192 | #endif |
---|
| 1193 | #ifdef FLT_MANT_DIG |
---|
| 1194 | checktype(FLT_MANT_DIG, "FLT_MANT_DIG", Signed, int); |
---|
| 1195 | #else |
---|
| 1196 | fmissing("FLT_MANT_DIG"); |
---|
| 1197 | #endif |
---|
| 1198 | #ifdef FLT_DIG |
---|
| 1199 | checktype(FLT_DIG, "FLT_DIG", Signed, int); |
---|
| 1200 | #else |
---|
| 1201 | fmissing("FLT_DIG"); |
---|
| 1202 | #endif |
---|
| 1203 | #ifdef FLT_ROUNDS |
---|
| 1204 | checktype(FLT_ROUNDS, "FLT_ROUNDS", Signed, int); |
---|
| 1205 | #else |
---|
| 1206 | fmissing("FLT_ROUNDS"); |
---|
| 1207 | #endif |
---|
| 1208 | #ifdef FLT_EPSILON |
---|
| 1209 | fchecktype(FLT_EPSILON, "FLT_EPSILON", float); |
---|
| 1210 | #else |
---|
| 1211 | fmissing("FLT_EPSILON"); |
---|
| 1212 | #endif |
---|
| 1213 | #ifdef FLT_MIN_EXP |
---|
| 1214 | checktype(FLT_MIN_EXP, "FLT_MIN_EXP", Signed, int); |
---|
| 1215 | #else |
---|
| 1216 | fmissing("FLT_MIN_EXP"); |
---|
| 1217 | #endif |
---|
| 1218 | #ifdef FLT_MIN |
---|
| 1219 | fchecktype(FLT_MIN, "FLT_MIN", float); |
---|
| 1220 | #else |
---|
| 1221 | fmissing("FLT_MIN"); |
---|
| 1222 | #endif |
---|
| 1223 | #ifdef FLT_MIN_10_EXP |
---|
| 1224 | checktype(FLT_MIN_10_EXP, "FLT_MIN_10_EXP", Signed, int); |
---|
| 1225 | #else |
---|
| 1226 | fmissing("FLT_MIN_10_EXP"); |
---|
| 1227 | #endif |
---|
| 1228 | #ifdef FLT_MAX_EXP |
---|
| 1229 | checktype(FLT_MAX_EXP, "FLT_MAX_EXP", Signed, int); |
---|
| 1230 | #else |
---|
| 1231 | fmissing("FLT_MAX_EXP"); |
---|
| 1232 | #endif |
---|
| 1233 | #ifdef FLT_MAX |
---|
| 1234 | fchecktype(FLT_MAX, "FLT_MAX", float); |
---|
| 1235 | #else |
---|
| 1236 | fmissing("FLT_MAX"); |
---|
| 1237 | #endif |
---|
| 1238 | #ifdef FLT_MAX_10_EXP |
---|
| 1239 | checktype(FLT_MAX_10_EXP, "FLT_MAX_10_EXP", Signed, int); |
---|
| 1240 | #else |
---|
| 1241 | fmissing("FLT_MAX_10_EXP"); |
---|
| 1242 | #endif |
---|
| 1243 | #ifdef DBL_MANT_DIG |
---|
| 1244 | checktype(DBL_MANT_DIG, "DBL_MANT_DIG", Signed, int); |
---|
| 1245 | #else |
---|
| 1246 | fmissing("DBL_MANT_DIG"); |
---|
| 1247 | #endif |
---|
| 1248 | #ifdef DBL_DIG |
---|
| 1249 | checktype(DBL_DIG, "DBL_DIG", Signed, int); |
---|
| 1250 | #else |
---|
| 1251 | fmissing("DBL_DIG"); |
---|
| 1252 | #endif |
---|
| 1253 | #ifdef DBL_EPSILON |
---|
| 1254 | fchecktype(DBL_EPSILON, "DBL_EPSILON", double); |
---|
| 1255 | #else |
---|
| 1256 | fmissing("DBL_EPSILON"); |
---|
| 1257 | #endif |
---|
| 1258 | #ifdef DBL_MIN_EXP |
---|
| 1259 | checktype(DBL_MIN_EXP, "DBL_MIN_EXP", Signed, int); |
---|
| 1260 | #else |
---|
| 1261 | fmissing("DBL_MIN_EXP"); |
---|
| 1262 | #endif |
---|
| 1263 | #ifdef DBL_MIN |
---|
| 1264 | fchecktype(DBL_MIN, "DBL_MIN", double); |
---|
| 1265 | #else |
---|
| 1266 | fmissing("DBL_MIN"); |
---|
| 1267 | #endif |
---|
| 1268 | #ifdef DBL_MIN_10_EXP |
---|
| 1269 | checktype(DBL_MIN_10_EXP, "DBL_MIN_10_EXP", Signed, int); |
---|
| 1270 | #else |
---|
| 1271 | fmissing("DBL_MIN_10_EXP"); |
---|
| 1272 | #endif |
---|
| 1273 | #ifdef DBL_MAX_EXP |
---|
| 1274 | checktype(DBL_MAX_EXP, "DBL_MAX_EXP", Signed, int); |
---|
| 1275 | #else |
---|
| 1276 | fmissing("DBL_MAX_EXP"); |
---|
| 1277 | #endif |
---|
| 1278 | #ifdef DBL_MAX |
---|
| 1279 | fchecktype(DBL_MAX, "DBL_MAX", double); |
---|
| 1280 | #else |
---|
| 1281 | fmissing("DBL_MAX"); |
---|
| 1282 | #endif |
---|
| 1283 | #ifdef DBL_MAX_10_EXP |
---|
| 1284 | checktype(DBL_MAX_10_EXP, "DBL_MAX_10_EXP", Signed, int); |
---|
| 1285 | #else |
---|
| 1286 | fmissing("DBL_MAX_10_EXP"); |
---|
| 1287 | #endif |
---|
| 1288 | #ifdef STDC |
---|
| 1289 | #ifdef LDBL_MANT_DIG |
---|
| 1290 | checktype(LDBL_MANT_DIG, "LDBL_MANT_DIG", Signed, int); |
---|
| 1291 | #else |
---|
| 1292 | fmissing("LDBL_MANT_DIG"); |
---|
| 1293 | #endif |
---|
| 1294 | #ifdef LDBL_DIG |
---|
| 1295 | checktype(LDBL_DIG, "LDBL_DIG", Signed, int); |
---|
| 1296 | #else |
---|
| 1297 | fmissing("LDBL_DIG"); |
---|
| 1298 | #endif |
---|
| 1299 | #ifdef LDBL_EPSILON |
---|
| 1300 | fchecktype(LDBL_EPSILON, "LDBL_EPSILON", long double); |
---|
| 1301 | #else |
---|
| 1302 | fmissing("LDBL_EPSILON"); |
---|
| 1303 | #endif |
---|
| 1304 | #ifdef LDBL_MIN_EXP |
---|
| 1305 | checktype(LDBL_MIN_EXP, "LDBL_MIN_EXP", Signed, int); |
---|
| 1306 | #else |
---|
| 1307 | fmissing("LDBL_MIN_EXP"); |
---|
| 1308 | #endif |
---|
| 1309 | #ifdef LDBL_MIN |
---|
| 1310 | fchecktype(LDBL_MIN, "LDBL_MIN", long double); |
---|
| 1311 | #else |
---|
| 1312 | fmissing("LDBL_MIN"); |
---|
| 1313 | #endif |
---|
| 1314 | #ifdef LDBL_MIN_10_EXP |
---|
| 1315 | checktype(LDBL_MIN_10_EXP, "LDBL_MIN_10_EXP", Signed, int); |
---|
| 1316 | #else |
---|
| 1317 | fmissing("LDBL_MIN_10_EXP"); |
---|
| 1318 | #endif |
---|
| 1319 | #ifdef LDBL_MAX_EXP |
---|
| 1320 | checktype(LDBL_MAX_EXP, "LDBL_MAX_EXP", Signed, int); |
---|
| 1321 | #else |
---|
| 1322 | fmissing("LDBL_MAX_EXP"); |
---|
| 1323 | #endif |
---|
| 1324 | #ifdef LDBL_MAX |
---|
| 1325 | fchecktype(LDBL_MAX, "LDBL_MAX", long double); |
---|
| 1326 | #else |
---|
| 1327 | fmissing("LDBL_MAX"); |
---|
| 1328 | #endif |
---|
| 1329 | #ifdef LDBL_MAX_10_EXP |
---|
| 1330 | checktype(LDBL_MAX_10_EXP, "LDBL_MAX_10_EXP", Signed, int); |
---|
| 1331 | #else |
---|
| 1332 | fmissing("LDBL_MAX_10_EXP"); |
---|
| 1333 | #endif |
---|
| 1334 | #endif /* STDC */ |
---|
| 1335 | } /* if (F) */ |
---|
| 1336 | #endif /* VERIFY */ |
---|
| 1337 | } |
---|
| 1338 | |
---|
| 1339 | #ifdef VERIFY |
---|
| 1340 | #ifndef SCHAR_MAX |
---|
| 1341 | #define SCHAR_MAX char_max |
---|
| 1342 | #endif |
---|
| 1343 | #ifndef SCHAR_MIN |
---|
| 1344 | #define SCHAR_MIN char_min |
---|
| 1345 | #endif |
---|
| 1346 | #ifndef UCHAR_MAX |
---|
| 1347 | #define UCHAR_MAX char_max |
---|
| 1348 | #endif |
---|
| 1349 | #endif /* VERIFY */ |
---|
| 1350 | |
---|
| 1351 | #ifndef CHAR_BIT |
---|
| 1352 | #define CHAR_BIT char_bit |
---|
| 1353 | #endif |
---|
| 1354 | #ifndef CHAR_MAX |
---|
| 1355 | #define CHAR_MAX char_max |
---|
| 1356 | #endif |
---|
| 1357 | #ifndef CHAR_MIN |
---|
| 1358 | #define CHAR_MIN char_min |
---|
| 1359 | #endif |
---|
| 1360 | #ifndef SCHAR_MAX |
---|
| 1361 | #define SCHAR_MAX char_max |
---|
| 1362 | #endif |
---|
| 1363 | #ifndef SCHAR_MIN |
---|
| 1364 | #define SCHAR_MIN char_min |
---|
| 1365 | #endif |
---|
| 1366 | #ifndef UCHAR_MAX |
---|
| 1367 | #define UCHAR_MAX char_max |
---|
| 1368 | #endif |
---|
| 1369 | |
---|
| 1370 | int cprop() { |
---|
| 1371 | /* Properties of type char */ |
---|
| 1372 | Volatile char c, char_max, char_min; |
---|
| 1373 | Volatile int bits_per_byte, c_signed; |
---|
| 1374 | long char_bit; |
---|
| 1375 | |
---|
| 1376 | Unexpected(2); |
---|
| 1377 | |
---|
| 1378 | /* Calculate number of bits per character *************************/ |
---|
| 1379 | c=1; bits_per_byte=0; |
---|
| 1380 | do { c=c<<1; bits_per_byte++; } while(c!=0); |
---|
| 1381 | c= (char)(-1); |
---|
| 1382 | if (((int)c)<0) c_signed=1; |
---|
| 1383 | else c_signed=0; |
---|
| 1384 | Vprintf("%schar = %d bits, %ssigned%s\n", |
---|
| 1385 | co, (int)sizeof(c)*bits_per_byte, (c_signed?"":"un"), oc); |
---|
| 1386 | char_bit=(long)(sizeof(c)*bits_per_byte); |
---|
| 1387 | if (L) i_define(D_CHAR_BIT, "", "CHAR", "_BIT", |
---|
| 1388 | char_bit, 0L, (long) CHAR_BIT, ""); |
---|
| 1389 | |
---|
| 1390 | c=0; char_max=0; |
---|
| 1391 | c++; |
---|
| 1392 | if (setjmp(lab)==0) { /* Yields char_max */ |
---|
| 1393 | while (c>char_max) { |
---|
| 1394 | char_max=c; |
---|
| 1395 | c++; |
---|
| 1396 | } |
---|
| 1397 | } else { |
---|
| 1398 | Vprintf("%sCharacter overflow generates a trap!%s\n", co, oc); |
---|
| 1399 | } |
---|
| 1400 | c=0; char_min=0; |
---|
| 1401 | c--; |
---|
| 1402 | if (setjmp(lab)==0) { /* Yields char_min */ |
---|
| 1403 | while (c<char_min) { |
---|
| 1404 | char_min=c; |
---|
| 1405 | c--; |
---|
| 1406 | } |
---|
| 1407 | } |
---|
| 1408 | if (c_signed && char_min == 0) { |
---|
| 1409 | Vprintf("%sBEWARE! Chars are pseudo-unsigned:%s\n", co, oc); |
---|
| 1410 | Vprintf("%s %s%s%s\n", |
---|
| 1411 | "They contain only nonnegative values, ", |
---|
| 1412 | "but sign extend when used as integers.", co, oc); |
---|
| 1413 | } |
---|
| 1414 | Unexpected(3); |
---|
| 1415 | |
---|
| 1416 | if (L) { |
---|
| 1417 | /* Because of the integer promotions, you must use a U after |
---|
| 1418 | the MAX_CHARS in the following cases */ |
---|
| 1419 | if ((sizeof(char) == sizeof(int)) && !c_signed) { |
---|
| 1420 | u_define(D_CHAR_MAX, "", "CHAR", "_MAX", |
---|
| 1421 | (long) char_max, |
---|
| 1422 | (long) CHAR_MAX, ""); |
---|
| 1423 | } else { |
---|
| 1424 | i_define(D_CHAR_MAX, "", "CHAR", "_MAX", |
---|
| 1425 | (long) char_max, 0L, |
---|
| 1426 | (long) CHAR_MAX, ""); |
---|
| 1427 | } |
---|
| 1428 | i_define(D_CHAR_MIN, "", "CHAR", "_MIN", |
---|
| 1429 | (long) char_min, (long) maxint, |
---|
| 1430 | (long) CHAR_MIN, ""); |
---|
| 1431 | if (c_signed) { |
---|
| 1432 | i_define(D_SCHAR_MAX, "", "SCHAR", "_MAX", |
---|
| 1433 | (long) char_max, 0L, |
---|
| 1434 | (long) SCHAR_MAX, ""); |
---|
| 1435 | i_define(D_SCHAR_MIN, "", "SCHAR", "_MIN", |
---|
| 1436 | (long) char_min, (long) maxint, |
---|
| 1437 | (long) SCHAR_MIN, ""); |
---|
| 1438 | } else { |
---|
| 1439 | if (sizeof(char) == sizeof(int)) { |
---|
| 1440 | u_define(D_UCHAR_MAX, "", "UCHAR", "_MAX", |
---|
| 1441 | (long) char_max, |
---|
| 1442 | (long) UCHAR_MAX, ""); |
---|
| 1443 | } else { |
---|
| 1444 | i_define(D_UCHAR_MAX, "", "UCHAR", "_MAX", |
---|
| 1445 | (long) char_max, 0L, |
---|
| 1446 | (long) UCHAR_MAX, ""); |
---|
| 1447 | } |
---|
| 1448 | } |
---|
| 1449 | |
---|
| 1450 | if (c_signed) { |
---|
| 1451 | #ifndef NO_UC |
---|
| 1452 | Volatile unsigned char c, char_max; |
---|
| 1453 | c=0; char_max=0; |
---|
| 1454 | c++; |
---|
| 1455 | if (setjmp(lab)==0) { /* Yields char_max */ |
---|
| 1456 | while (c>char_max) { |
---|
| 1457 | char_max=c; |
---|
| 1458 | c++; |
---|
| 1459 | } |
---|
| 1460 | } |
---|
| 1461 | Unexpected(4); |
---|
| 1462 | if (sizeof(char) == sizeof(int)) { |
---|
| 1463 | u_define(D_UCHAR_MAX, "", "UCHAR", "_MAX", |
---|
| 1464 | (long) char_max, |
---|
| 1465 | (long) UCHAR_MAX, ""); |
---|
| 1466 | } else { |
---|
| 1467 | i_define(D_UCHAR_MAX, "", "UCHAR", "_MAX", |
---|
| 1468 | (long) char_max, 0L, |
---|
| 1469 | (long) UCHAR_MAX, ""); |
---|
| 1470 | } |
---|
| 1471 | #endif |
---|
| 1472 | } else { |
---|
| 1473 | #ifndef NO_SC |
---|
| 1474 | /* Define NO_SC if this gives a syntax error */ Volatile signed char c, char_max, char_min; |
---|
| 1475 | c=0; char_max=0; |
---|
| 1476 | c++; |
---|
| 1477 | if (setjmp(lab)==0) { /* Yields char_max */ |
---|
| 1478 | while (c>char_max) { |
---|
| 1479 | char_max=c; |
---|
| 1480 | c++; |
---|
| 1481 | } |
---|
| 1482 | } |
---|
| 1483 | c=0; char_min=0; |
---|
| 1484 | c--; |
---|
| 1485 | if (setjmp(lab)==0) { /* Yields char_min */ |
---|
| 1486 | while (c<char_min) { |
---|
| 1487 | char_min=c; |
---|
| 1488 | c--; |
---|
| 1489 | } |
---|
| 1490 | } |
---|
| 1491 | Unexpected(5); |
---|
| 1492 | i_define(D_SCHAR_MIN, "", "SCHAR", "_MIN", |
---|
| 1493 | (long) char_min, (long) maxint, |
---|
| 1494 | (long) SCHAR_MIN, ""); |
---|
| 1495 | i_define(D_SCHAR_MAX, "", "SCHAR", "_MAX", |
---|
| 1496 | (long) char_max, 0L, |
---|
| 1497 | (long) SCHAR_MAX, ""); |
---|
| 1498 | #endif /* NO_SC */ |
---|
| 1499 | } |
---|
| 1500 | } |
---|
| 1501 | return bits_per_byte; |
---|
| 1502 | } |
---|
| 1503 | |
---|
| 1504 | int basic() { |
---|
| 1505 | /* The properties of the basic types. |
---|
| 1506 | Returns number of bits per sizeof unit */ |
---|
| 1507 | Volatile int bits_per_byte; |
---|
| 1508 | typedef int function (); |
---|
| 1509 | int variable; |
---|
| 1510 | int *p, *q; |
---|
| 1511 | |
---|
| 1512 | Vprintf("%sSIZES%s\n", co, oc); |
---|
| 1513 | bits_per_byte= cprop(); |
---|
| 1514 | |
---|
| 1515 | /* Shorts, ints and longs *****************************************/ |
---|
| 1516 | Vprintf("%sshort=%d int=%d long=%d float=%d double=%d bits %s\n", |
---|
| 1517 | co, |
---|
| 1518 | (int) sizeof(short)*bits_per_byte, |
---|
| 1519 | (int) sizeof(int)*bits_per_byte, |
---|
| 1520 | (int) sizeof(long)*bits_per_byte, |
---|
| 1521 | (int) sizeof(float)*bits_per_byte, |
---|
| 1522 | (int) sizeof(double)*bits_per_byte, oc); |
---|
| 1523 | if (stdc) { |
---|
| 1524 | Vprintf("%slong double=%d bits%s\n", |
---|
| 1525 | co, (int) sizeof(Long_double)*bits_per_byte, oc); |
---|
| 1526 | } |
---|
| 1527 | Vprintf("%schar*=%d bits%s%s\n", |
---|
| 1528 | co, (int)sizeof(char *)*bits_per_byte, |
---|
| 1529 | sizeof(char *)>sizeof(int)?" BEWARE! larger than int!":"", |
---|
| 1530 | oc); |
---|
| 1531 | Vprintf("%sint* =%d bits%s%s\n", |
---|
| 1532 | co, (int)sizeof(int *)*bits_per_byte, |
---|
| 1533 | sizeof(int *)>sizeof(int)?" BEWARE! larger than int!":"", |
---|
| 1534 | oc); |
---|
| 1535 | Vprintf("%sfunc*=%d bits%s%s\n", |
---|
| 1536 | co, (int)sizeof(function *)*bits_per_byte, |
---|
| 1537 | sizeof(function *)>sizeof(int)?" BEWARE! larger than int!":"", |
---|
| 1538 | oc); |
---|
| 1539 | if (V) printf ("%s%s %s %s%s\n", co, "Type size_t is", |
---|
| 1540 | ((((false()?( sizeof(int)):(-1)) < 0) )? |
---|
| 1541 | "signed":"unsigned") , |
---|
| 1542 | type_of(sizeof( |
---|
| 1543 | sizeof(int)+0 |
---|
| 1544 | ) |
---|
| 1545 | ), |
---|
| 1546 | oc); |
---|
| 1547 | showtype("Type size_t is", sizeof(0)); |
---|
| 1548 | |
---|
| 1549 | /* Alignment constants ********************************************/ |
---|
| 1550 | |
---|
| 1551 | #define alignment(TYPE) \ |
---|
| 1552 | ((long)((char *)&((struct{char c; TYPE d;}*)0)->d - (char *)0)) |
---|
| 1553 | |
---|
| 1554 | Vprintf("\n%sALIGNMENTS%s\n", co, oc); |
---|
| 1555 | |
---|
| 1556 | Vprintf("%schar=%ld short=%ld int=%ld long=%ld%s\n", |
---|
| 1557 | co, |
---|
| 1558 | alignment(char), alignment(short), |
---|
| 1559 | alignment(int), alignment(long), |
---|
| 1560 | oc); |
---|
| 1561 | |
---|
| 1562 | Vprintf("%sfloat=%ld double=%ld%s\n", |
---|
| 1563 | co, |
---|
| 1564 | alignment(float), alignment(double), |
---|
| 1565 | oc); |
---|
| 1566 | |
---|
| 1567 | if (stdc) { |
---|
| 1568 | Vprintf("%slong double=%ld%s\n", |
---|
| 1569 | co, |
---|
| 1570 | alignment(Long_double), |
---|
| 1571 | oc); |
---|
| 1572 | } |
---|
| 1573 | Vprintf("%schar*=%ld int*=%ld func*=%ld%s\n", |
---|
| 1574 | co, |
---|
| 1575 | alignment(char *), alignment(int *), alignment(function *), |
---|
| 1576 | oc); |
---|
| 1577 | |
---|
| 1578 | Vprintf("\n"); |
---|
| 1579 | |
---|
| 1580 | /* Ten little endians *********************************************/ |
---|
| 1581 | |
---|
| 1582 | endian(bits_per_byte); |
---|
| 1583 | |
---|
| 1584 | /* Pointers *******************************************************/ |
---|
| 1585 | |
---|
| 1586 | Vprintf("\n%sPROPERTIES OF POINTERS%s\n", co, oc); |
---|
| 1587 | |
---|
| 1588 | if ((long) (char *) &variable == (long) (int *) &variable) |
---|
| 1589 | Vprintf("%sChar and int pointer formats seem identical%s\n", |
---|
| 1590 | co, oc); |
---|
| 1591 | else |
---|
| 1592 | Vprintf("%sChar and int pointer formats are different%s\n", |
---|
| 1593 | co, oc); |
---|
| 1594 | if ((long) (char *) &variable == (long) (function *) &variable) |
---|
| 1595 | Vprintf("%sChar and function pointer formats seem identical%s\n", |
---|
| 1596 | co, oc); |
---|
| 1597 | else |
---|
| 1598 | Vprintf("%sChar and function pointer formats are different%s\n", |
---|
| 1599 | co, oc); |
---|
| 1600 | |
---|
| 1601 | if (V) { |
---|
| 1602 | if ("abcd"=="abcd") |
---|
| 1603 | printf("%sStrings are shared%s\n", co, oc); |
---|
| 1604 | else printf("%sStrings are not shared%s\n", co, oc); |
---|
| 1605 | } |
---|
| 1606 | |
---|
| 1607 | p=0; q=0; |
---|
| 1608 | showtype("Type ptrdiff_t is", p-q); |
---|
| 1609 | |
---|
| 1610 | Vprintf("\n%sPROPERTIES OF INTEGRAL TYPES%s\n", co, oc); |
---|
| 1611 | |
---|
| 1612 | sprop(); |
---|
| 1613 | iprop(); |
---|
| 1614 | lprop(); |
---|
| 1615 | usprop(); |
---|
| 1616 | uiprop(); |
---|
| 1617 | ulprop(); |
---|
| 1618 | |
---|
| 1619 | promotions(); |
---|
| 1620 | |
---|
| 1621 | Unexpected(6); |
---|
| 1622 | |
---|
| 1623 | return bits_per_byte; |
---|
| 1624 | } |
---|
| 1625 | |
---|
| 1626 | #else /* not PASS0 */ |
---|
| 1627 | |
---|
| 1628 | #ifdef SEP |
---|
| 1629 | extern jmp_buf lab; |
---|
| 1630 | extern int V, L, F, bugs, bits_per_byte; |
---|
| 1631 | extern char co[], oc[]; |
---|
| 1632 | extern char *f_rep(); |
---|
| 1633 | #endif /* SEP */ |
---|
| 1634 | #endif /* ifdef PASS0 */ |
---|
| 1635 | |
---|
| 1636 | /* As I said, I apologise for the contortions below. The functions are |
---|
| 1637 | expanded by the preprocessor twice or three times (for float and double, |
---|
| 1638 | and maybe for long double, and for short, int and long). That way, |
---|
| 1639 | I never make a change to one that I forget to make to the other. |
---|
| 1640 | You can look on it as C's fault for not supporting multi-line macro's. |
---|
| 1641 | This whole file is read 3 times by the preprocessor, with PASSn set for |
---|
| 1642 | n=1, 2 or 3, to decide which parts to reprocess. |
---|
| 1643 | */ |
---|
| 1644 | |
---|
| 1645 | /* #undef on an already undefined thing is (wrongly) flagged as an error |
---|
| 1646 | by some compilers, therefore the #ifdef that follows: |
---|
| 1647 | */ |
---|
| 1648 | #ifdef Number |
---|
| 1649 | #undef Number |
---|
| 1650 | #undef THING |
---|
| 1651 | #undef Thing |
---|
| 1652 | #undef thing |
---|
| 1653 | #undef FPROP |
---|
| 1654 | #undef Fname |
---|
| 1655 | #undef Store |
---|
| 1656 | #undef Sum |
---|
| 1657 | #undef Diff |
---|
| 1658 | #undef Mul |
---|
| 1659 | #undef Div |
---|
| 1660 | #undef ZERO |
---|
| 1661 | #undef HALF |
---|
| 1662 | #undef ONE |
---|
| 1663 | #undef TWO |
---|
| 1664 | #undef THREE |
---|
| 1665 | #undef FOUR |
---|
| 1666 | #undef Self |
---|
| 1667 | #undef F_check |
---|
| 1668 | #undef Validate |
---|
| 1669 | #undef EPROP |
---|
| 1670 | #undef MARK |
---|
| 1671 | |
---|
| 1672 | /* These are the float.h constants */ |
---|
| 1673 | #undef F_RADIX |
---|
| 1674 | #undef F_MANT_DIG |
---|
| 1675 | #undef F_DIG |
---|
| 1676 | #undef F_ROUNDS |
---|
| 1677 | #undef F_EPSILON |
---|
| 1678 | #undef F_MIN_EXP |
---|
| 1679 | #undef F_MIN |
---|
| 1680 | #undef F_MIN_10_EXP |
---|
| 1681 | #undef F_MAX_EXP |
---|
| 1682 | #undef F_MAX |
---|
| 1683 | #undef F_MAX_10_EXP |
---|
| 1684 | #endif |
---|
| 1685 | |
---|
| 1686 | #ifdef Integer |
---|
| 1687 | #undef Integer |
---|
| 1688 | #undef INT |
---|
| 1689 | #undef IPROP |
---|
| 1690 | #undef Iname |
---|
| 1691 | #undef UPROP |
---|
| 1692 | #undef Uname |
---|
| 1693 | #undef OK_UI |
---|
| 1694 | #undef IMARK |
---|
| 1695 | |
---|
| 1696 | #undef I_MAX |
---|
| 1697 | #undef I_MIN |
---|
| 1698 | #undef U_MAX |
---|
| 1699 | #endif |
---|
| 1700 | |
---|
| 1701 | #ifdef PASS1 |
---|
| 1702 | |
---|
| 1703 | /* Define the things we're going to use this pass */ |
---|
| 1704 | |
---|
| 1705 | #define Number float |
---|
| 1706 | #define THING "FLOAT" |
---|
| 1707 | #define Thing "Float" |
---|
| 1708 | #define thing "float" |
---|
| 1709 | #define Fname "FLT" |
---|
| 1710 | #define FPROP fprop |
---|
| 1711 | #define Store fStore |
---|
| 1712 | #define Sum fSum |
---|
| 1713 | #define Diff fDiff |
---|
| 1714 | #define Mul fMul |
---|
| 1715 | #define Div fDiv |
---|
| 1716 | #define ZERO 0.0 |
---|
| 1717 | #define HALF 0.5 |
---|
| 1718 | #define ONE 1.0 |
---|
| 1719 | #define TWO 2.0 |
---|
| 1720 | #define THREE 3.0 |
---|
| 1721 | #define FOUR 4.0 |
---|
| 1722 | #define Self fSelf |
---|
| 1723 | #define F_check fCheck |
---|
| 1724 | #define MARK "F" |
---|
| 1725 | #ifdef VERIFY |
---|
| 1726 | #define Validate(prec, val, req, same) fValidate(prec, val, req, same) |
---|
| 1727 | #endif |
---|
| 1728 | |
---|
| 1729 | #define EPROP efprop |
---|
| 1730 | |
---|
| 1731 | #define Integer short |
---|
| 1732 | #define INT "short" |
---|
| 1733 | #define IPROP sprop |
---|
| 1734 | #define Iname "SHRT" |
---|
| 1735 | #ifndef NO_UI |
---|
| 1736 | #define OK_UI 1 |
---|
| 1737 | #endif |
---|
| 1738 | #define IMARK "" |
---|
| 1739 | |
---|
| 1740 | #define UPROP usprop |
---|
| 1741 | #define Uname "USHRT" |
---|
| 1742 | |
---|
| 1743 | #ifdef VERIFY |
---|
| 1744 | #ifdef SHRT_MAX |
---|
| 1745 | #define I_MAX SHRT_MAX |
---|
| 1746 | #endif |
---|
| 1747 | #ifdef SHRT_MIN |
---|
| 1748 | #define I_MIN SHRT_MIN |
---|
| 1749 | #endif |
---|
| 1750 | #ifdef USHRT_MAX |
---|
| 1751 | #define U_MAX USHRT_MAX |
---|
| 1752 | #endif |
---|
| 1753 | |
---|
| 1754 | #ifdef FLT_RADIX |
---|
| 1755 | #define F_RADIX FLT_RADIX |
---|
| 1756 | #endif |
---|
| 1757 | #ifdef FLT_MANT_DIG |
---|
| 1758 | #define F_MANT_DIG FLT_MANT_DIG |
---|
| 1759 | #endif |
---|
| 1760 | #ifdef FLT_DIG |
---|
| 1761 | #define F_DIG FLT_DIG |
---|
| 1762 | #endif |
---|
| 1763 | #ifdef FLT_ROUNDS |
---|
| 1764 | #define F_ROUNDS FLT_ROUNDS |
---|
| 1765 | #endif |
---|
| 1766 | #ifdef FLT_EPSILON |
---|
| 1767 | #define F_EPSILON FLT_EPSILON |
---|
| 1768 | #endif |
---|
| 1769 | #ifdef FLT_MIN_EXP |
---|
| 1770 | #define F_MIN_EXP FLT_MIN_EXP |
---|
| 1771 | #endif |
---|
| 1772 | #ifdef FLT_MIN |
---|
| 1773 | #define F_MIN FLT_MIN |
---|
| 1774 | #endif |
---|
| 1775 | #ifdef FLT_MIN_10_EXP |
---|
| 1776 | #define F_MIN_10_EXP FLT_MIN_10_EXP |
---|
| 1777 | #endif |
---|
| 1778 | #ifdef FLT_MAX_EXP |
---|
| 1779 | #define F_MAX_EXP FLT_MAX_EXP |
---|
| 1780 | #endif |
---|
| 1781 | #ifdef FLT_MAX |
---|
| 1782 | #define F_MAX FLT_MAX |
---|
| 1783 | #endif |
---|
| 1784 | #ifdef FLT_MAX_10_EXP |
---|
| 1785 | #define F_MAX_10_EXP FLT_MAX_10_EXP |
---|
| 1786 | #endif |
---|
| 1787 | #endif /* VERIFY */ |
---|
| 1788 | |
---|
| 1789 | #endif /* PASS1 */ |
---|
| 1790 | |
---|
| 1791 | #ifdef PASS2 |
---|
| 1792 | |
---|
| 1793 | #define Number double |
---|
| 1794 | #define THING "DOUBLE" |
---|
| 1795 | #define Thing "Double" |
---|
| 1796 | #define thing "double" |
---|
| 1797 | #define Fname "DBL" |
---|
| 1798 | #define FPROP dprop |
---|
| 1799 | #define Store dStore |
---|
| 1800 | #define Sum dSum |
---|
| 1801 | #define Diff dDiff |
---|
| 1802 | #define Mul dMul |
---|
| 1803 | #define Div dDiv |
---|
| 1804 | #define ZERO 0.0 |
---|
| 1805 | #define HALF 0.5 |
---|
| 1806 | #define ONE 1.0 |
---|
| 1807 | #define TWO 2.0 |
---|
| 1808 | #define THREE 3.0 |
---|
| 1809 | #define FOUR 4.0 |
---|
| 1810 | #define Self dSelf |
---|
| 1811 | #define F_check dCheck |
---|
| 1812 | #define MARK "" |
---|
| 1813 | #ifdef VERIFY |
---|
| 1814 | #define Validate(prec, val, req, same) dValidate(prec, val, req, same) |
---|
| 1815 | #endif |
---|
| 1816 | |
---|
| 1817 | #define EPROP edprop |
---|
| 1818 | |
---|
| 1819 | #define Integer int |
---|
| 1820 | #define INT "int" |
---|
| 1821 | #define IPROP iprop |
---|
| 1822 | #define Iname "INT" |
---|
| 1823 | #define OK_UI 1 /* Unsigned int is always possible */ |
---|
| 1824 | #define IMARK "" |
---|
| 1825 | |
---|
| 1826 | #define UPROP uiprop |
---|
| 1827 | #define Uname "UINT" |
---|
| 1828 | |
---|
| 1829 | #ifdef VERIFY |
---|
| 1830 | #ifdef INT_MAX |
---|
| 1831 | #define I_MAX INT_MAX |
---|
| 1832 | #endif |
---|
| 1833 | #ifdef INT_MIN |
---|
| 1834 | #define I_MIN INT_MIN |
---|
| 1835 | #endif |
---|
| 1836 | #ifdef UINT_MAX |
---|
| 1837 | #define U_MAX UINT_MAX |
---|
| 1838 | #endif |
---|
| 1839 | |
---|
| 1840 | #ifdef DBL_MANT_DIG |
---|
| 1841 | #define F_MANT_DIG DBL_MANT_DIG |
---|
| 1842 | #endif |
---|
| 1843 | #ifdef DBL_DIG |
---|
| 1844 | #define F_DIG DBL_DIG |
---|
| 1845 | #endif |
---|
| 1846 | #ifdef DBL_EPSILON |
---|
| 1847 | #define F_EPSILON DBL_EPSILON |
---|
| 1848 | #endif |
---|
| 1849 | #ifdef DBL_MIN_EXP |
---|
| 1850 | #define F_MIN_EXP DBL_MIN_EXP |
---|
| 1851 | #endif |
---|
| 1852 | #ifdef DBL_MIN |
---|
| 1853 | #define F_MIN DBL_MIN |
---|
| 1854 | #endif |
---|
| 1855 | #ifdef DBL_MIN_10_EXP |
---|
| 1856 | #define F_MIN_10_EXP DBL_MIN_10_EXP |
---|
| 1857 | #endif |
---|
| 1858 | #ifdef DBL_MAX_EXP |
---|
| 1859 | #define F_MAX_EXP DBL_MAX_EXP |
---|
| 1860 | #endif |
---|
| 1861 | #ifdef DBL_MAX |
---|
| 1862 | #define F_MAX DBL_MAX |
---|
| 1863 | #endif |
---|
| 1864 | #ifdef DBL_MAX_10_EXP |
---|
| 1865 | #define F_MAX_10_EXP DBL_MAX_10_EXP |
---|
| 1866 | #endif |
---|
| 1867 | #endif /* VERIFY */ |
---|
| 1868 | |
---|
| 1869 | #endif /* PASS2 */ |
---|
| 1870 | |
---|
| 1871 | #ifdef PASS3 |
---|
| 1872 | |
---|
| 1873 | #ifdef STDC |
---|
| 1874 | #define Number long double |
---|
| 1875 | |
---|
| 1876 | #define ZERO 0.0L |
---|
| 1877 | #define HALF 0.5L |
---|
| 1878 | #define ONE 1.0L |
---|
| 1879 | #define TWO 2.0L |
---|
| 1880 | #define THREE 3.0L |
---|
| 1881 | #define FOUR 4.0L |
---|
| 1882 | #endif |
---|
| 1883 | |
---|
| 1884 | #define THING "LONG DOUBLE" |
---|
| 1885 | #define Thing "Long double" |
---|
| 1886 | #define thing "long double" |
---|
| 1887 | #define Fname "LDBL" |
---|
| 1888 | #define FPROP ldprop |
---|
| 1889 | #define Store ldStore |
---|
| 1890 | #define Sum ldSum |
---|
| 1891 | #define Diff ldDiff |
---|
| 1892 | #define Mul ldMul |
---|
| 1893 | #define Div ldDiv |
---|
| 1894 | #define Self ldSelf |
---|
| 1895 | #define F_check ldCheck |
---|
| 1896 | #define MARK "L" |
---|
| 1897 | #ifdef VERIFY |
---|
| 1898 | #define Validate(prec, val, req, same) ldValidate(prec, val, req, same) |
---|
| 1899 | #endif |
---|
| 1900 | |
---|
| 1901 | #define EPROP eldprop |
---|
| 1902 | |
---|
| 1903 | #define Integer long |
---|
| 1904 | #define INT "long" |
---|
| 1905 | #define IPROP lprop |
---|
| 1906 | #define Iname "LONG" |
---|
| 1907 | #ifndef NO_UI |
---|
| 1908 | #define OK_UI 1 |
---|
| 1909 | #endif |
---|
| 1910 | #define IMARK "L" |
---|
| 1911 | |
---|
| 1912 | #define UPROP ulprop |
---|
| 1913 | #define Uname "ULONG" |
---|
| 1914 | |
---|
| 1915 | #ifdef VERIFY |
---|
| 1916 | #ifdef LONG_MAX |
---|
| 1917 | #define I_MAX LONG_MAX |
---|
| 1918 | #endif |
---|
| 1919 | #ifdef LONG_MIN |
---|
| 1920 | #define I_MIN LONG_MIN |
---|
| 1921 | #endif |
---|
| 1922 | #ifdef ULONG_MAX |
---|
| 1923 | #define U_MAX ULONG_MAX |
---|
| 1924 | #endif |
---|
| 1925 | |
---|
| 1926 | #ifdef LDBL_MANT_DIG |
---|
| 1927 | #define F_MANT_DIG LDBL_MANT_DIG |
---|
| 1928 | #endif |
---|
| 1929 | #ifdef LDBL_DIG |
---|
| 1930 | #define F_DIG LDBL_DIG |
---|
| 1931 | #endif |
---|
| 1932 | #ifdef LDBL_EPSILON |
---|
| 1933 | #define F_EPSILON LDBL_EPSILON |
---|
| 1934 | #endif |
---|
| 1935 | #ifdef LDBL_MIN_EXP |
---|
| 1936 | #define F_MIN_EXP LDBL_MIN_EXP |
---|
| 1937 | #endif |
---|
| 1938 | #ifdef LDBL_MIN |
---|
| 1939 | #define F_MIN LDBL_MIN |
---|
| 1940 | #endif |
---|
| 1941 | #ifdef LDBL_MIN_10_EXP |
---|
| 1942 | #define F_MIN_10_EXP LDBL_MIN_10_EXP |
---|
| 1943 | #endif |
---|
| 1944 | #ifdef LDBL_MAX_EXP |
---|
| 1945 | #define F_MAX_EXP LDBL_MAX_EXP |
---|
| 1946 | #endif |
---|
| 1947 | #ifdef LDBL_MAX |
---|
| 1948 | #define F_MAX LDBL_MAX |
---|
| 1949 | #endif |
---|
| 1950 | #ifdef LDBL_MAX_10_EXP |
---|
| 1951 | #define F_MAX_10_EXP LDBL_MAX_10_EXP |
---|
| 1952 | #endif |
---|
| 1953 | #endif /* VERIFY */ |
---|
| 1954 | |
---|
| 1955 | #endif /* PASS3 */ |
---|
| 1956 | |
---|
| 1957 | #ifndef I_MAX |
---|
| 1958 | #define I_MAX int_max |
---|
| 1959 | #endif |
---|
| 1960 | #ifndef I_MIN |
---|
| 1961 | #define I_MIN int_min |
---|
| 1962 | #endif |
---|
| 1963 | #ifndef U_MAX |
---|
| 1964 | #define U_MAX u_max |
---|
| 1965 | #endif |
---|
| 1966 | |
---|
| 1967 | #ifndef F_RADIX |
---|
| 1968 | #define F_RADIX f_radix |
---|
| 1969 | #endif |
---|
| 1970 | #ifndef F_MANT_DIG |
---|
| 1971 | #define F_MANT_DIG f_mant_dig |
---|
| 1972 | #endif |
---|
| 1973 | #ifndef F_DIG |
---|
| 1974 | #define F_DIG f_dig |
---|
| 1975 | #endif |
---|
| 1976 | #ifndef F_ROUNDS |
---|
| 1977 | #define F_ROUNDS f_rounds |
---|
| 1978 | #endif |
---|
| 1979 | #ifndef F_EPSILON |
---|
| 1980 | #define F_EPSILON f_epsilon |
---|
| 1981 | #endif |
---|
| 1982 | #ifndef F_MIN_EXP |
---|
| 1983 | #define F_MIN_EXP f_min_exp |
---|
| 1984 | #endif |
---|
| 1985 | #ifndef F_MIN |
---|
| 1986 | #define F_MIN f_min |
---|
| 1987 | #endif |
---|
| 1988 | #ifndef F_MIN_10_EXP |
---|
| 1989 | #define F_MIN_10_EXP f_min_10_exp |
---|
| 1990 | #endif |
---|
| 1991 | #ifndef F_MAX_EXP |
---|
| 1992 | #define F_MAX_EXP f_max_exp |
---|
| 1993 | #endif |
---|
| 1994 | #ifndef F_MAX |
---|
| 1995 | #define F_MAX f_max |
---|
| 1996 | #endif |
---|
| 1997 | #ifndef F_MAX_10_EXP |
---|
| 1998 | #define F_MAX_10_EXP f_max_10_exp |
---|
| 1999 | #endif |
---|
| 2000 | |
---|
| 2001 | #ifndef VERIFY |
---|
| 2002 | #define Validate(prec, val, req, same) {;} |
---|
| 2003 | #endif |
---|
| 2004 | |
---|
| 2005 | #ifdef Integer |
---|
| 2006 | |
---|
| 2007 | Procedure IPROP() { |
---|
| 2008 | /* the properties of short, int, and long */ |
---|
| 2009 | Volatile Integer newi, int_max, maxeri, int_min, minneri; |
---|
| 2010 | Volatile int ibits, ipower, two=2; |
---|
| 2011 | |
---|
| 2012 | /* Calculate max short/int/long ***********************************/ |
---|
| 2013 | /* Calculate 2**n-1 until overflow - then use the previous value */ |
---|
| 2014 | |
---|
| 2015 | newi=1; int_max=0; |
---|
| 2016 | |
---|
| 2017 | if (setjmp(lab)==0) { /* Yields int_max */ |
---|
| 2018 | for(ipower=0; newi>int_max; ipower++) { |
---|
| 2019 | int_max=newi; |
---|
| 2020 | newi=newi*two+1; |
---|
| 2021 | } |
---|
| 2022 | Vprintf("%sOverflow of a%s %s does not generate a trap%s\n", |
---|
| 2023 | co, INT[0]=='i'?"n":"", INT, oc); |
---|
| 2024 | } else { |
---|
| 2025 | Vprintf("%sOverflow of a%s %s generates a trap%s\n", |
---|
| 2026 | co, INT[0]=='i'?"n":"", INT, oc); |
---|
| 2027 | } |
---|
| 2028 | Unexpected(7); |
---|
| 2029 | |
---|
| 2030 | /* Minimum value: assume either two's or one's complement *********/ |
---|
| 2031 | int_min= -int_max; |
---|
| 2032 | if (setjmp(lab)==0) { /* Yields int_min */ |
---|
| 2033 | if (int_min-1 < int_min) int_min--; |
---|
| 2034 | } |
---|
| 2035 | Unexpected(8); |
---|
| 2036 | |
---|
| 2037 | /* Now for those daft Cybers */ |
---|
| 2038 | |
---|
| 2039 | maxeri=0; newi=int_max; |
---|
| 2040 | |
---|
| 2041 | if (setjmp(lab)==0) { /* Yields maxeri */ |
---|
| 2042 | for(ibits=ipower; newi>maxeri; ibits++) { |
---|
| 2043 | maxeri=newi; |
---|
| 2044 | newi=newi+newi+1; |
---|
| 2045 | } |
---|
| 2046 | } |
---|
| 2047 | Unexpected(9); |
---|
| 2048 | |
---|
| 2049 | minneri= -maxeri; |
---|
| 2050 | if (setjmp(lab)==0) { /* Yields minneri */ |
---|
| 2051 | if (minneri-1 < minneri) minneri--; |
---|
| 2052 | } |
---|
| 2053 | Unexpected(10); |
---|
| 2054 | |
---|
| 2055 | Vprintf("%sMaximum %s = %ld (= 2**%d-1)%s\n", |
---|
| 2056 | co, INT, (long)int_max, ipower, oc); |
---|
| 2057 | Vprintf("%sMinimum %s = %ld%s\n", co, INT, (long)int_min, oc); |
---|
| 2058 | |
---|
| 2059 | if (L) i_define(D_INT_MAX, INT, Iname, "_MAX", |
---|
| 2060 | (long) int_max, 0L, |
---|
| 2061 | (long) I_MAX, IMARK); |
---|
| 2062 | if (L) i_define(D_INT_MIN, INT, Iname, "_MIN", |
---|
| 2063 | (long) int_min, (long) (PASS==1?maxint:int_max), |
---|
| 2064 | (long) I_MIN, IMARK); |
---|
| 2065 | |
---|
| 2066 | if(int_max < 0) { /* It has happened */ |
---|
| 2067 | eek_a_bug("signed integral comparison faulty?"); |
---|
| 2068 | } |
---|
| 2069 | |
---|
| 2070 | if (maxeri>int_max) { |
---|
| 2071 | Vprintf("%sThere is a larger %s, %ld (= 2**%d-1), %s %s%s\n", |
---|
| 2072 | co, INT, (long)maxeri, ibits, |
---|
| 2073 | "but only for addition, not multiplication", |
---|
| 2074 | "(I smell a Cyber!)", |
---|
| 2075 | oc); |
---|
| 2076 | } |
---|
| 2077 | |
---|
| 2078 | if (minneri<int_min) { |
---|
| 2079 | Vprintf("%sThere is a smaller %s, %ld, %s %s%s\n", |
---|
| 2080 | co, INT, (long)minneri, |
---|
| 2081 | "but only for addition, not multiplication", |
---|
| 2082 | "(I smell a Cyber!)", |
---|
| 2083 | oc); |
---|
| 2084 | } |
---|
| 2085 | } |
---|
| 2086 | |
---|
| 2087 | Procedure UPROP () { |
---|
| 2088 | /* The properties of unsigned short/int/long */ |
---|
| 2089 | #ifdef OK_UI |
---|
| 2090 | Volatile unsigned Integer u_max, newi, two; |
---|
| 2091 | newi=1; u_max=0; two=2; |
---|
| 2092 | |
---|
| 2093 | if (setjmp(lab)==0) { /* Yields u_max */ |
---|
| 2094 | while(newi>u_max) { |
---|
| 2095 | u_max=newi; |
---|
| 2096 | newi=newi*two+1; |
---|
| 2097 | } |
---|
| 2098 | } |
---|
| 2099 | Unexpected(11); |
---|
| 2100 | Vprintf("%sMaximum unsigned %s = %lu%s\n", |
---|
| 2101 | co, INT, (unsigned long) u_max, oc); |
---|
| 2102 | |
---|
| 2103 | /* Oh woe: new standard C defines value preserving promotions */ |
---|
| 2104 | if (L) { |
---|
| 2105 | if (PASS == 1 && sizeof(short) < sizeof(int)) { |
---|
| 2106 | /* Special only for short */ |
---|
| 2107 | i_define(D_UINT_MAX, INT, Uname, "_MAX", |
---|
| 2108 | (unsigned long) u_max, 0L, |
---|
| 2109 | (unsigned long) U_MAX, IMARK); |
---|
| 2110 | } else { |
---|
| 2111 | u_define(D_UINT_MAX, INT, Uname, "_MAX", |
---|
| 2112 | (unsigned long) u_max, |
---|
| 2113 | (unsigned long) U_MAX, IMARK); |
---|
| 2114 | } |
---|
| 2115 | } |
---|
| 2116 | #endif |
---|
| 2117 | } |
---|
| 2118 | |
---|
| 2119 | #endif /* Integer */ |
---|
| 2120 | |
---|
| 2121 | #ifdef Number |
---|
| 2122 | |
---|
| 2123 | /* The following routines are intended to defeat any attempt at optimisation |
---|
| 2124 | or use of extended precision, and to defeat faulty narrowing casts. |
---|
| 2125 | The weird prototypes are because of widening incompatibilities. |
---|
| 2126 | */ |
---|
| 2127 | #ifdef STDC |
---|
| 2128 | #define ARGS1(atype, a) (atype a) |
---|
| 2129 | #define ARGS2(atype, a, btype, b) (atype a, btype b) |
---|
| 2130 | #else |
---|
| 2131 | #define ARGS1(atype, a) (a) atype a; |
---|
| 2132 | #define ARGS2(atype, a, btype, b) (a, b) atype a; btype b; |
---|
| 2133 | #endif |
---|
| 2134 | |
---|
| 2135 | Procedure Store ARGS2(Number, a, Number *, b) { *b=a; } |
---|
| 2136 | Number Sum ARGS2(Number, a, Number, b) {Number r; Store(a+b, &r); return (r); } |
---|
| 2137 | Number Diff ARGS2(Number, a, Number, b){Number r; Store(a-b, &r); return (r); } |
---|
| 2138 | Number Mul ARGS2(Number, a, Number, b) {Number r; Store(a*b, &r); return (r); } |
---|
| 2139 | Number Div ARGS2(Number, a, Number, b) {Number r; Store(a/b, &r); return (r); } |
---|
| 2140 | Number Self ARGS1(Number, a) {Number r; Store(a, &r); return (r); } |
---|
| 2141 | |
---|
| 2142 | Procedure F_check ARGS((int precision, Long_double val1)); |
---|
| 2143 | |
---|
| 2144 | Procedure F_check(precision, val1) int precision; Long_double val1; { |
---|
| 2145 | /* You don't think I'm going to go to all the trouble of writing |
---|
| 2146 | a program that works out what all sorts of values are, only to |
---|
| 2147 | have printf go and print the wrong values out, do you? |
---|
| 2148 | No, you're right, so this function tries to see if printf |
---|
| 2149 | has written the right value, by reading it back again. |
---|
| 2150 | This introduces a new problem of course: suppose printf writes |
---|
| 2151 | the correct value, and scanf reads it back wrong... oh well. |
---|
| 2152 | But I'm adamant about this: the precision given is enough |
---|
| 2153 | to uniquely identify the printed number, therefore I insist |
---|
| 2154 | that sscanf read the number back identically. Harsh yes, but |
---|
| 2155 | sometimes you've got to be cruel to be kind. |
---|
| 2156 | */ |
---|
| 2157 | Number val, new, diff; |
---|
| 2158 | double rem; |
---|
| 2159 | int e; |
---|
| 2160 | char *rep; |
---|
| 2161 | char *f2; |
---|
| 2162 | |
---|
| 2163 | #ifdef NO_LONG_DOUBLE_IO |
---|
| 2164 | double new1; |
---|
| 2165 | /* On the Sun 3, sscanf clobbers 4 words, |
---|
| 2166 | which leads to a crash when this function tries to return. */ |
---|
| 2167 | f2= "%le"; /* Input */ |
---|
| 2168 | /* It is no use checking long doubles if we can't |
---|
| 2169 | read and write them. */ |
---|
| 2170 | if (sizeof (Number) > sizeof(double)) |
---|
| 2171 | return; |
---|
| 2172 | #else |
---|
| 2173 | Long_double new1; |
---|
| 2174 | if (sizeof(double) == sizeof(Long_double)) { |
---|
| 2175 | /* Assume they're the same, and use non-stdc format */ |
---|
| 2176 | /* This is for stdc compilers using non-stdc libraries */ |
---|
| 2177 | f2= "%le"; /* Input */ |
---|
| 2178 | } else { |
---|
| 2179 | /* It had better support Le then */ |
---|
| 2180 | f2= "%Le"; |
---|
| 2181 | } |
---|
| 2182 | #endif |
---|
| 2183 | val= val1; |
---|
| 2184 | rep= f_rep(precision, (Long_double) val); |
---|
| 2185 | if (setjmp(lab)==0) { |
---|
| 2186 | sscanf(rep, f2, &new1); |
---|
| 2187 | } else { |
---|
| 2188 | eek_a_bug("sscanf caused a trap"); |
---|
| 2189 | printf("%s scanning: %s format: %s%s\n\n", co, rep, f2, oc); |
---|
| 2190 | Unexpected(12); |
---|
| 2191 | return; |
---|
| 2192 | } |
---|
| 2193 | |
---|
| 2194 | if (setjmp(lab)==0) { /* See if new is usable */ |
---|
| 2195 | new= new1; |
---|
| 2196 | if (new != 0.0) { |
---|
| 2197 | diff= val/new - 1.0; |
---|
| 2198 | if (diff < 0.1) diff= 1.0; |
---|
| 2199 | /* That should be enough to generate a trap */ |
---|
| 2200 | } |
---|
| 2201 | } else { |
---|
| 2202 | eek_a_bug("sscanf returned an unusable number"); |
---|
| 2203 | printf("%s scanning: %s with format: %s%s\n\n", |
---|
| 2204 | co, rep, f2, oc); |
---|
| 2205 | Unexpected(13); |
---|
| 2206 | return; |
---|
| 2207 | } |
---|
| 2208 | |
---|
| 2209 | Unexpected(14); |
---|
| 2210 | if (new != val) { |
---|
| 2211 | eek_a_bug("Possibly bad output from printf above"); |
---|
| 2212 | if (!exponent((Long_double)val, &rem, &e)) { |
---|
| 2213 | printf("%s but value was an unusable number%s\n\n", |
---|
| 2214 | co, oc); |
---|
| 2215 | return; |
---|
| 2216 | } |
---|
| 2217 | printf("%s expected value around %.*fe%d, bit pattern:\n ", |
---|
| 2218 | co, precision, rem, e); |
---|
| 2219 | bitpattern((char *) &val, (unsigned)sizeof(val)); |
---|
| 2220 | printf ("%s\n", oc); |
---|
| 2221 | printf("%s sscanf gave %s, bit pattern:\n ", |
---|
| 2222 | co, f_rep(precision, (Long_double) new)); |
---|
| 2223 | bitpattern((char *) &new, (unsigned)sizeof(new)); |
---|
| 2224 | printf ("%s\n", oc); |
---|
| 2225 | if (setjmp(lab) == 0) { |
---|
| 2226 | diff= val-new; |
---|
| 2227 | printf("%s difference= %s%s\n\n", |
---|
| 2228 | co, f_rep(precision, (Long_double) diff), oc); |
---|
| 2229 | } /* else forget it */ |
---|
| 2230 | Unexpected(15); |
---|
| 2231 | } |
---|
| 2232 | } |
---|
| 2233 | |
---|
| 2234 | #ifdef VERIFY |
---|
| 2235 | Procedure Validate(prec, val, req, same) int prec, same; Long_double val, req; { |
---|
| 2236 | /* Check that the compiler has read a #define value correctly */ |
---|
| 2237 | Unexpected(16); |
---|
| 2238 | if (!same) { |
---|
| 2239 | printf("%s*** Verify failed for above #define!\n", co); |
---|
| 2240 | if (setjmp(lab) == 0) { /* for the case that req == nan */ |
---|
| 2241 | printf(" Compiler has %s for value%s\n", |
---|
| 2242 | f_rep(prec, req), oc); |
---|
| 2243 | } else { |
---|
| 2244 | printf(" Compiler has %s for value%s\n", |
---|
| 2245 | "an unusable number", oc); |
---|
| 2246 | } |
---|
| 2247 | if (setjmp(lab) == 0) { |
---|
| 2248 | F_check(prec, (Long_double) req); |
---|
| 2249 | } /*else forget it*/ |
---|
| 2250 | if (setjmp(lab) == 0) { |
---|
| 2251 | if (req > 0.0 && val > 0.0) { |
---|
| 2252 | printf("%s difference= %s%s\n", |
---|
| 2253 | co, f_rep(prec, val-req), oc); |
---|
| 2254 | } |
---|
| 2255 | } /*else forget it*/ |
---|
| 2256 | Unexpected(17); |
---|
| 2257 | printf("\n"); |
---|
| 2258 | bugs++; |
---|
| 2259 | } else if (val != req) { |
---|
| 2260 | if (stdc) eek_a_bug("constant has the wrong precision"); |
---|
| 2261 | else eek_a_bug("the cast didn't work"); |
---|
| 2262 | printf("\n"); |
---|
| 2263 | } |
---|
| 2264 | } |
---|
| 2265 | #endif /* VERIFY */ |
---|
| 2266 | |
---|
| 2267 | int FPROP(bits_per_byte) int bits_per_byte; { |
---|
| 2268 | /* Properties of floating types, using algorithms by Cody and Waite |
---|
| 2269 | from MA Malcolm, as modified by WM Gentleman and SB Marovich. |
---|
| 2270 | Further extended by S Pemberton. |
---|
| 2271 | |
---|
| 2272 | Returns the number of digits in the fraction. |
---|
| 2273 | */ |
---|
| 2274 | |
---|
| 2275 | Volatile int |
---|
| 2276 | i, f_radix, iexp, irnd, mrnd, f_rounds, f_mant_dig, |
---|
| 2277 | iz, k, inf, machep, f_max_exp, f_min_exp, mx, negeps, |
---|
| 2278 | mantbits, digs, f_dig, trap, |
---|
| 2279 | hidden, normal, f_min_10_exp, f_max_10_exp; |
---|
| 2280 | Volatile Number |
---|
| 2281 | a, b, base, basein, basem1, f_epsilon, epsneg, |
---|
| 2282 | eps, epsp1, etop, ebot, |
---|
| 2283 | f_max, newxmax, f_min, xminner, y, y1, z, z1, z2; |
---|
| 2284 | |
---|
| 2285 | Unexpected(18); |
---|
| 2286 | |
---|
| 2287 | Vprintf("%sPROPERTIES OF %s%s\n", co, THING, oc); |
---|
| 2288 | |
---|
| 2289 | /* Base and size of significand **************************************/ |
---|
| 2290 | /* First repeatedly double until adding 1 has no effect. */ |
---|
| 2291 | /* For instance, if base is 10, with 3 significant digits */ |
---|
| 2292 | /* it will try 1, 2, 4, 8, ... 512, 1024, and stop there, */ |
---|
| 2293 | /* since 1024 is only representable as 1020. */ |
---|
| 2294 | a=1.0; |
---|
| 2295 | if (setjmp(lab)==0) { /* inexact trap? */ |
---|
| 2296 | do { a=Sum(a, a); } |
---|
| 2297 | while (Diff(Diff(Sum(a, ONE), a), ONE) == ZERO); |
---|
| 2298 | } else { |
---|
| 2299 | fprintf(stderr, "*** Program got loss-of-precision trap!\n"); |
---|
| 2300 | /* And supporting those is just TOO much trouble! */ |
---|
| 2301 | farewell(bugs+1); |
---|
| 2302 | } |
---|
| 2303 | Unexpected(19); |
---|
| 2304 | /* Now double until you find a number that can be added to the */ |
---|
| 2305 | /* above number. For 1020 this is 8 or 16, depending whether the */ |
---|
| 2306 | /* result is rounded or truncated. */ |
---|
| 2307 | /* In either case the result is 1030. 1030-1020= the base, 10. */ |
---|
| 2308 | b=1.0; |
---|
| 2309 | do { b=Sum(b, b); } while ((base=Diff(Sum(a, b), a)) == ZERO); |
---|
| 2310 | f_radix=base; |
---|
| 2311 | Vprintf("%sBase = %d%s\n", co, f_radix, oc); |
---|
| 2312 | |
---|
| 2313 | /* Sanity check; if base<2, I can't guarantee the rest will work */ |
---|
| 2314 | if (f_radix < 2) { |
---|
| 2315 | eek_a_bug("Function return or parameter passing faulty? (This is a guess.)"); |
---|
| 2316 | printf("\n"); |
---|
| 2317 | return(0); |
---|
| 2318 | } |
---|
| 2319 | |
---|
| 2320 | if (PASS == 1) { /* only for FLT */ |
---|
| 2321 | flt_radix= f_radix; |
---|
| 2322 | if (F) i_define(D_FLT_RADIX, "", "FLT", "_RADIX", |
---|
| 2323 | (long) f_radix, 0L, (long) F_RADIX, ""); |
---|
| 2324 | } else if (f_radix != flt_radix) { |
---|
| 2325 | printf("\n%s*** WARNING: %s %s (%d) %s%s\n", |
---|
| 2326 | co, thing, "arithmetic has a different radix", |
---|
| 2327 | f_radix, "from float", oc); |
---|
| 2328 | bugs++; |
---|
| 2329 | } |
---|
| 2330 | |
---|
| 2331 | /* Now the number of digits precision */ |
---|
| 2332 | f_mant_dig=0; b=1.0; |
---|
| 2333 | do { f_mant_dig++; b=Mul(b, base); } |
---|
| 2334 | while (Diff(Diff(Sum(b, ONE), b), ONE) == ZERO); |
---|
| 2335 | f_dig=floor_log(10, (Long_double)(b/base)) + (base==10?1:0); |
---|
| 2336 | Vprintf("%sSignificant base digits = %d %s %d %s%s\n", |
---|
| 2337 | co, f_mant_dig, "(= at least", f_dig, "decimal digits)", oc); |
---|
| 2338 | if (F) i_define(D_MANT_DIG, thing, Fname, "_MANT_DIG", |
---|
| 2339 | (long) f_mant_dig, 0L, (long) F_MANT_DIG, ""); |
---|
| 2340 | if (F) i_define(D_DIG, thing, Fname, "_DIG", |
---|
| 2341 | (long) f_dig, 0L, (long) F_DIG, ""); |
---|
| 2342 | digs= ceil_log(10, (Long_double)b); /* the number of digits to printf */ |
---|
| 2343 | |
---|
| 2344 | /* Rounding *******************************************************/ |
---|
| 2345 | basem1=Diff(base, HALF); |
---|
| 2346 | if (Diff(Sum(a, basem1), a) != ZERO) { |
---|
| 2347 | if (f_radix == 2) basem1=0.375; |
---|
| 2348 | else basem1=1.0; |
---|
| 2349 | if (Diff(Sum(a, basem1), a) != ZERO) irnd=2; /* away from 0 */ |
---|
| 2350 | else irnd=1; /* to nearest */ |
---|
| 2351 | } else irnd=0; /* towards 0 */ |
---|
| 2352 | |
---|
| 2353 | basem1=Diff(base, HALF); |
---|
| 2354 | |
---|
| 2355 | if (Diff(Diff(-a, basem1), -a) != ZERO) { |
---|
| 2356 | if (f_radix == 2) basem1=0.375; |
---|
| 2357 | else basem1=1.0; |
---|
| 2358 | if (Diff(Diff(-a, basem1), -a) != ZERO) mrnd=2; /* away from 0*/ |
---|
| 2359 | else mrnd=1; /* to nearest */ |
---|
| 2360 | } else mrnd=0; /* towards 0 */ |
---|
| 2361 | |
---|
| 2362 | f_rounds= -1; /* Unknown rounding */ |
---|
| 2363 | if (irnd==0 && mrnd==0) f_rounds=0; /* zero = chops */ |
---|
| 2364 | if (irnd==1 && mrnd==1) f_rounds=1; /* nearest */ |
---|
| 2365 | if (irnd==2 && mrnd==0) f_rounds=2; /* +inf */ |
---|
| 2366 | if (irnd==0 && mrnd==2) f_rounds=3; /* -inf */ |
---|
| 2367 | |
---|
| 2368 | if (f_rounds != -1) { |
---|
| 2369 | Vprintf("%sArithmetic rounds towards ", co); |
---|
| 2370 | switch (f_rounds) { |
---|
| 2371 | case 0: Vprintf("zero (i.e. it chops)"); break; |
---|
| 2372 | case 1: Vprintf("nearest"); break; |
---|
| 2373 | case 2: Vprintf("+infinity"); break; |
---|
| 2374 | case 3: Vprintf("-infinity"); break; |
---|
| 2375 | default: Vprintf("???"); break; |
---|
| 2376 | } |
---|
| 2377 | Vprintf("%s\n", oc); |
---|
| 2378 | } else { /* Hmm, try to give some help here */ |
---|
| 2379 | Vprintf("%sArithmetic rounds oddly: %s\n", co, oc); |
---|
| 2380 | Vprintf("%s Negative numbers %s%s\n", |
---|
| 2381 | co, mrnd==0 ? "towards zero" : |
---|
| 2382 | mrnd==1 ? "to nearest" : |
---|
| 2383 | "away from zero", |
---|
| 2384 | oc); |
---|
| 2385 | Vprintf("%s Positive numbers %s%s\n", |
---|
| 2386 | co, irnd==0 ? "towards zero" : |
---|
| 2387 | irnd==1 ? "to nearest" : |
---|
| 2388 | "away from zero", |
---|
| 2389 | oc); |
---|
| 2390 | } |
---|
| 2391 | /* An extra goody */ |
---|
| 2392 | if (f_radix == 2 && f_rounds == 1) { |
---|
| 2393 | if (Diff(Sum(a, ONE), a) != ZERO) { |
---|
| 2394 | Vprintf("%s Tie breaking rounds up%s\n", co, oc); |
---|
| 2395 | } else if (Diff(Sum(a, THREE), a) == FOUR) { |
---|
| 2396 | Vprintf("%s Tie breaking rounds to even%s\n", co, oc); |
---|
| 2397 | } else { |
---|
| 2398 | Vprintf("%s Tie breaking rounds down%s\n", co, oc); |
---|
| 2399 | } |
---|
| 2400 | } |
---|
| 2401 | if (PASS == 1) { /* only for FLT */ |
---|
| 2402 | flt_rounds= f_rounds; |
---|
| 2403 | if (F) |
---|
| 2404 | i_define(D_FLT_ROUNDS, "", "FLT", "_ROUNDS", |
---|
| 2405 | (long) f_rounds, 1L, (long) F_ROUNDS, ""); |
---|
| 2406 | } else if (f_rounds != flt_rounds) { |
---|
| 2407 | printf("\n%s*** WARNING: %s %s (%d) %s%s\n", |
---|
| 2408 | co, thing, "arithmetic rounds differently", |
---|
| 2409 | f_rounds, "from float", oc); |
---|
| 2410 | bugs++; |
---|
| 2411 | } |
---|
| 2412 | |
---|
| 2413 | /* Various flavours of epsilon ************************************/ |
---|
| 2414 | negeps=f_mant_dig+f_mant_dig; |
---|
| 2415 | basein=1.0/base; |
---|
| 2416 | a=1.0; |
---|
| 2417 | for(i=1; i<=negeps; i++) a*=basein; |
---|
| 2418 | |
---|
| 2419 | b=a; |
---|
| 2420 | while (Diff(Diff(ONE, a), ONE) == ZERO) { |
---|
| 2421 | a*=base; |
---|
| 2422 | negeps--; |
---|
| 2423 | } |
---|
| 2424 | negeps= -negeps; |
---|
| 2425 | Vprintf("%sSmallest x such that 1.0-base**x != 1.0 = %d%s\n", |
---|
| 2426 | co, negeps, oc); |
---|
| 2427 | |
---|
| 2428 | etop = ONE; |
---|
| 2429 | ebot = ZERO; |
---|
| 2430 | eps = Sum(ebot, Div(Diff(etop, ebot), TWO)); |
---|
| 2431 | /* find the smallest epsneg (1-epsneg != 1) by binary search. |
---|
| 2432 | ebot and etop are the current bounds */ |
---|
| 2433 | while (eps != ebot && eps != etop) { |
---|
| 2434 | epsp1 = Diff(ONE, eps); |
---|
| 2435 | if (epsp1 < ONE) etop = eps; |
---|
| 2436 | else ebot = eps; |
---|
| 2437 | eps = Sum(ebot, Div(Diff(etop, ebot), TWO)); |
---|
| 2438 | } |
---|
| 2439 | eps= etop; |
---|
| 2440 | /* Sanity check */ |
---|
| 2441 | if (Diff(ONE, etop) >= ONE || Diff(ONE, ebot) != ONE) { |
---|
| 2442 | eek_a_bug("internal error calculating epsneg"); |
---|
| 2443 | } |
---|
| 2444 | Vprintf("%sSmallest x such that 1.0-x != 1.0 = %s%s\n", |
---|
| 2445 | co, f_rep(digs, (Long_double) eps), oc); |
---|
| 2446 | if (V) F_check(digs, (Long_double) eps); |
---|
| 2447 | |
---|
| 2448 | epsneg=a; |
---|
| 2449 | if ((f_radix!=2) && irnd) { |
---|
| 2450 | /* a=(a*(1.0+a))/(1.0+1.0); => */ |
---|
| 2451 | a=Div(Mul(a, Sum(ONE, a)), Sum(ONE, ONE)); |
---|
| 2452 | /* if ((1.0-a)-1.0 != 0.0) epsneg=a; => */ |
---|
| 2453 | if (Diff(Diff(ONE, a), ONE) != ZERO) epsneg=a; |
---|
| 2454 | } |
---|
| 2455 | /* epsneg is used later */ |
---|
| 2456 | Unexpected(20); |
---|
| 2457 | |
---|
| 2458 | machep= -f_mant_dig-f_mant_dig; |
---|
| 2459 | a=b; |
---|
| 2460 | while (Diff(Sum(ONE, a), ONE) == ZERO) { a*=base; machep++; } |
---|
| 2461 | Vprintf("%sSmallest x such that 1.0+base**x != 1.0 = %d%s\n", |
---|
| 2462 | co, machep, oc); |
---|
| 2463 | |
---|
| 2464 | etop = ONE; |
---|
| 2465 | ebot = ZERO; |
---|
| 2466 | eps = Sum(ebot, Div(Diff(etop, ebot), TWO)); |
---|
| 2467 | /* find the smallest eps (1+eps != 1) by binary search. |
---|
| 2468 | ebot and etop are the current bounds */ |
---|
| 2469 | while (eps != ebot && eps != etop) { |
---|
| 2470 | epsp1 = Sum(ONE, eps); |
---|
| 2471 | if (epsp1 > ONE) etop = eps; |
---|
| 2472 | else ebot = eps; |
---|
| 2473 | eps = Sum(ebot, Div(Diff(etop, ebot), TWO)); |
---|
| 2474 | } |
---|
| 2475 | /* Sanity check */ |
---|
| 2476 | if (Sum(ONE, etop) <= ONE || Sum(ONE, ebot) != ONE) { |
---|
| 2477 | eek_a_bug("internal error calculating eps"); |
---|
| 2478 | } |
---|
| 2479 | f_epsilon=etop; |
---|
| 2480 | |
---|
| 2481 | Vprintf("%sSmallest x such that 1.0+x != 1.0 = %s%s\n", |
---|
| 2482 | co, f_rep(digs, (Long_double) f_epsilon), oc); |
---|
| 2483 | |
---|
| 2484 | f_epsilon= Diff(Sum(ONE, f_epsilon), ONE); /* New C standard defn */ |
---|
| 2485 | Vprintf("%s(Above number + 1.0) - 1.0 = %s%s\n", |
---|
| 2486 | co, f_rep(digs, (Long_double) (f_epsilon)), oc); |
---|
| 2487 | |
---|
| 2488 | /* Possible loss of precision warnings here from non-stdc compilers */ |
---|
| 2489 | if (F) f_define(D_EPSILON, thing, |
---|
| 2490 | Fname, "_EPSILON", digs, (Long_double) f_epsilon, MARK); |
---|
| 2491 | if (V || F) F_check(digs, (Long_double) f_epsilon); |
---|
| 2492 | Unexpected(21); |
---|
| 2493 | if (F) Validate(digs, (Long_double) f_epsilon, (Long_double) F_EPSILON, |
---|
| 2494 | f_epsilon == Self(F_EPSILON)); |
---|
| 2495 | Unexpected(22); |
---|
| 2496 | |
---|
| 2497 | /* Extra chop info *************************************************/ |
---|
| 2498 | if (f_rounds == 0) { |
---|
| 2499 | if (Diff(Mul(Sum(ONE,f_epsilon),ONE),ONE) != ZERO) { |
---|
| 2500 | Vprintf("%sAlthough arithmetic chops, it uses guard digits%s\n", co, oc); |
---|
| 2501 | } |
---|
| 2502 | } |
---|
| 2503 | |
---|
| 2504 | /* Size of and minimum normalised exponent ************************/ |
---|
| 2505 | y=0; i=0; k=1; z=basein; z1=(1.0+f_epsilon)/base; |
---|
| 2506 | |
---|
| 2507 | /* Coarse search for the largest power of two */ |
---|
| 2508 | if (setjmp(lab)==0) { /* for underflow trap */ /* Yields i, k, y, y1 */ |
---|
| 2509 | do { |
---|
| 2510 | y=z; y1=z1; |
---|
| 2511 | z=Mul(y,y); z1=Mul(z1, y); |
---|
| 2512 | a=Mul(z,ONE); |
---|
| 2513 | z2=Div(z1,y); |
---|
| 2514 | if (z2 != y1) break; |
---|
| 2515 | if ((Sum(a,a) == ZERO) || (fabs(z) >= y)) break; |
---|
| 2516 | i++; |
---|
| 2517 | k+=k; |
---|
| 2518 | } while(1); |
---|
| 2519 | } else { |
---|
| 2520 | Vprintf("%s%s underflow generates a trap%s\n", co, Thing, oc); |
---|
| 2521 | } |
---|
| 2522 | Unexpected(23); |
---|
| 2523 | |
---|
| 2524 | if (f_radix != 10) { |
---|
| 2525 | iexp=i+1; /* for the sign */ |
---|
| 2526 | mx=k+k; |
---|
| 2527 | } else { |
---|
| 2528 | iexp=2; |
---|
| 2529 | iz=f_radix; |
---|
| 2530 | while (k >= iz) { iz*=f_radix; iexp++; } |
---|
| 2531 | mx=iz+iz-1; |
---|
| 2532 | } |
---|
| 2533 | |
---|
| 2534 | /* Fine tune starting with y and y1 */ |
---|
| 2535 | if (setjmp(lab)==0) { /* for underflow trap */ /* Yields k, f_min */ |
---|
| 2536 | do { |
---|
| 2537 | f_min=y; z1=y1; |
---|
| 2538 | y=Div(y,base); y1=Div(y1,base); |
---|
| 2539 | a=Mul(y,ONE); |
---|
| 2540 | z2=Mul(y1,base); |
---|
| 2541 | if (z2 != z1) break; |
---|
| 2542 | if ((Sum(a,a) == ZERO) || (fabs(y) >= f_min)) break; |
---|
| 2543 | k++; |
---|
| 2544 | } while (1); |
---|
| 2545 | } |
---|
| 2546 | Unexpected(24); |
---|
| 2547 | |
---|
| 2548 | f_min_exp=(-k)+1; |
---|
| 2549 | |
---|
| 2550 | if ((mx <= k+k-3) && (f_radix != 10)) { mx+=mx; iexp+=1; } |
---|
| 2551 | Vprintf("%sNumber of bits used for exponent = %d%s\n", co, iexp, oc); |
---|
| 2552 | Vprintf("%sMinimum normalised exponent = %d%s\n", co, f_min_exp-1, oc); |
---|
| 2553 | if (F) |
---|
| 2554 | i_define(D_MIN_EXP, thing, Fname, "_MIN_EXP", |
---|
| 2555 | (long) f_min_exp, (long) maxint, (long) F_MIN_EXP, ""); |
---|
| 2556 | |
---|
| 2557 | if (setjmp(lab)==0) { |
---|
| 2558 | Vprintf("%sMinimum normalised positive number = %s%s\n", |
---|
| 2559 | co, f_rep(digs, (Long_double) f_min), oc); |
---|
| 2560 | } else { |
---|
| 2561 | eek_a_bug("printf can't print the smallest normalised number"); |
---|
| 2562 | printf("\n"); |
---|
| 2563 | } |
---|
| 2564 | Unexpected(25); |
---|
| 2565 | /* Possible loss of precision warnings here from non-stdc compilers */ |
---|
| 2566 | if (setjmp(lab) == 0) { |
---|
| 2567 | if (F) f_define(D_MIN, thing, |
---|
| 2568 | Fname, "_MIN", digs, (Long_double) f_min, MARK); |
---|
| 2569 | if (V || F) F_check(digs, (Long_double) f_min); |
---|
| 2570 | } else { |
---|
| 2571 | eek_a_bug("xxx_MIN caused a trap"); |
---|
| 2572 | printf("\n"); |
---|
| 2573 | } |
---|
| 2574 | |
---|
| 2575 | if (setjmp(lab) == 0) { |
---|
| 2576 | if (F) Validate(digs, (Long_double) f_min, (Long_double) F_MIN, |
---|
| 2577 | f_min == Self(F_MIN)); |
---|
| 2578 | } else { |
---|
| 2579 | printf("%s*** Verify failed for above #define!\n %s %s\n\n", |
---|
| 2580 | co, "Compiler has an unusable number for value", oc); |
---|
| 2581 | bugs++; |
---|
| 2582 | } |
---|
| 2583 | Unexpected(26); |
---|
| 2584 | |
---|
| 2585 | a=1.0; f_min_10_exp=0; |
---|
| 2586 | while (a > f_min*10.0) { a/=10.0; f_min_10_exp--; } |
---|
| 2587 | if (F) i_define(D_MIN_10_EXP, thing, Fname, "_MIN_10_EXP", |
---|
| 2588 | (long) f_min_10_exp, (long) maxint, |
---|
| 2589 | (long) F_MIN_10_EXP, ""); |
---|
| 2590 | |
---|
| 2591 | /* Minimum exponent ************************************************/ |
---|
| 2592 | if (setjmp(lab)==0) { /* for underflow trap */ /* Yields xminner */ |
---|
| 2593 | do { |
---|
| 2594 | xminner=y; |
---|
| 2595 | y=Div(y,base); |
---|
| 2596 | a=Mul(y,ONE); |
---|
| 2597 | if ((Sum(a,a) == ZERO) || (fabs(y) >= xminner)) break; |
---|
| 2598 | } while (1); |
---|
| 2599 | } |
---|
| 2600 | Unexpected(27); |
---|
| 2601 | |
---|
| 2602 | if (xminner != 0.0 && xminner != f_min) { |
---|
| 2603 | normal= 0; |
---|
| 2604 | Vprintf("%sThe smallest numbers are not kept normalised%s\n", |
---|
| 2605 | co, oc); |
---|
| 2606 | if (setjmp(lab)==0) { |
---|
| 2607 | Vprintf("%sSmallest unnormalised positive number = %s%s\n", |
---|
| 2608 | co, f_rep(digs, (Long_double) xminner), oc); |
---|
| 2609 | if (V) F_check(digs, (Long_double) xminner); |
---|
| 2610 | } else { |
---|
| 2611 | eek_a_bug("printf can't print the smallest unnormalised number."); |
---|
| 2612 | printf("\n"); |
---|
| 2613 | } |
---|
| 2614 | Unexpected(28); |
---|
| 2615 | } else { |
---|
| 2616 | normal= 1; |
---|
| 2617 | Vprintf("%sThe smallest numbers are normalised%s\n", co, oc); |
---|
| 2618 | } |
---|
| 2619 | |
---|
| 2620 | /* Maximum exponent ************************************************/ |
---|
| 2621 | f_max_exp=2; f_max=1.0; newxmax=base+1.0; |
---|
| 2622 | inf=0; trap=0; |
---|
| 2623 | while (f_max<newxmax) { |
---|
| 2624 | f_max=newxmax; |
---|
| 2625 | if (setjmp(lab) == 0) { /* Yields inf, f_max_exp */ |
---|
| 2626 | newxmax=Mul(newxmax, base); |
---|
| 2627 | } else { |
---|
| 2628 | trap=1; |
---|
| 2629 | break; |
---|
| 2630 | } |
---|
| 2631 | if (Div(newxmax, base) != f_max) { |
---|
| 2632 | inf=1; /* ieee infinity */ |
---|
| 2633 | break; |
---|
| 2634 | } |
---|
| 2635 | f_max_exp++; |
---|
| 2636 | } |
---|
| 2637 | Unexpected(29); |
---|
| 2638 | if (trap) { |
---|
| 2639 | Vprintf("%s%s overflow generates a trap%s\n", co, Thing, oc); |
---|
| 2640 | } |
---|
| 2641 | |
---|
| 2642 | if (inf) Vprintf("%sThere is an 'infinite' value%s\n", co, oc); |
---|
| 2643 | Vprintf("%sMaximum exponent = %d%s\n", co, f_max_exp, oc); |
---|
| 2644 | if (F) i_define(D_MAX_EXP, thing, Fname, "_MAX_EXP", |
---|
| 2645 | (long) f_max_exp, 0L, (long) F_MAX_EXP, ""); |
---|
| 2646 | |
---|
| 2647 | /* Largest number ***************************************************/ |
---|
| 2648 | f_max=Diff(ONE, epsneg); |
---|
| 2649 | if (Mul(f_max,ONE) != f_max) f_max=Diff(ONE, Mul(base,epsneg)); |
---|
| 2650 | for (i=1; i<=f_max_exp; i++) f_max=Mul(f_max, base); |
---|
| 2651 | |
---|
| 2652 | if (setjmp(lab)==0) { |
---|
| 2653 | Vprintf("%sMaximum number = %s%s\n", |
---|
| 2654 | co, f_rep(digs, (Long_double) f_max), oc); |
---|
| 2655 | } else { |
---|
| 2656 | eek_a_bug("printf can't print the largest double."); |
---|
| 2657 | printf("\n"); |
---|
| 2658 | } |
---|
| 2659 | if (setjmp(lab)==0) { |
---|
| 2660 | /* Possible loss of precision warnings here from non-stdc compilers */ |
---|
| 2661 | if (F) f_define(D_MAX, thing, |
---|
| 2662 | Fname, "_MAX", digs, (Long_double) f_max, MARK); |
---|
| 2663 | if (V || F) F_check(digs, (Long_double) f_max); |
---|
| 2664 | } else { |
---|
| 2665 | eek_a_bug("xxx_MAX caused a trap"); |
---|
| 2666 | printf("\n"); |
---|
| 2667 | } |
---|
| 2668 | if (setjmp(lab)==0) { |
---|
| 2669 | if (F) Validate(digs, (Long_double) f_max, (Long_double) F_MAX, |
---|
| 2670 | f_max == Self(F_MAX)); |
---|
| 2671 | } else { |
---|
| 2672 | printf("%s*** Verify failed for above #define!\n %s %s\n\n", |
---|
| 2673 | co, "Compiler has an unusable number for value", oc); |
---|
| 2674 | bugs++; |
---|
| 2675 | } |
---|
| 2676 | Unexpected(30); |
---|
| 2677 | |
---|
| 2678 | a=1.0; f_max_10_exp=0; |
---|
| 2679 | while (a < f_max/10.0) { a*=10.0; f_max_10_exp++; } |
---|
| 2680 | if (F) i_define(D_MAX_10_EXP, thing, Fname, "_MAX_10_EXP", |
---|
| 2681 | (long) f_max_10_exp, 0L, (long) F_MAX_10_EXP, ""); |
---|
| 2682 | |
---|
| 2683 | /* Hidden bit + sanity check ****************************************/ |
---|
| 2684 | if (f_radix != 10) { |
---|
| 2685 | hidden=0; |
---|
| 2686 | mantbits=floor_log(2, (Long_double)f_radix)*f_mant_dig; |
---|
| 2687 | if (mantbits == 64 |
---|
| 2688 | && iexp == 15 |
---|
| 2689 | && f_max_exp+f_min_exp > 0 /* ??? f_min_exp may be wrong. */ |
---|
| 2690 | && mantbits+iexp+17 == (int)sizeof(Number)*bits_per_byte) { |
---|
| 2691 | Vprintf("%sArithmetic probably doesn't use a hidden bit%s\n", co, oc); |
---|
| 2692 | Vprintf("%sIt's probably 80387 or 68881 extended real%s\n", co, oc); |
---|
| 2693 | goto is_extended; |
---|
| 2694 | } |
---|
| 2695 | if (mantbits+iexp == (int)sizeof(Number)*bits_per_byte) { |
---|
| 2696 | hidden=1; |
---|
| 2697 | Vprintf("%sArithmetic uses a hidden bit%s\n", co, oc); |
---|
| 2698 | } else if (mantbits+iexp+1 == (int)sizeof(Number)*bits_per_byte) { |
---|
| 2699 | Vprintf("%sArithmetic doesn't use a hidden bit%s\n", |
---|
| 2700 | co, oc); |
---|
| 2701 | } else { |
---|
| 2702 | printf("\n%s%s\n %s %s %s!%s\n\n", |
---|
| 2703 | co, |
---|
| 2704 | "*** Something fishy here!", |
---|
| 2705 | "Exponent size + significand size doesn't match", |
---|
| 2706 | "with the size of a", thing, |
---|
| 2707 | oc); |
---|
| 2708 | } |
---|
| 2709 | if (hidden && f_radix == 2 && f_max_exp+f_min_exp==3) { |
---|
| 2710 | Vprintf("%sIt looks like %s length IEEE format%s\n", |
---|
| 2711 | co, f_mant_dig==24 ? "single" : |
---|
| 2712 | f_mant_dig==53 ? "double" : |
---|
| 2713 | f_mant_dig >53 ? "extended" : |
---|
| 2714 | "some", oc); |
---|
| 2715 | is_extended: |
---|
| 2716 | if (f_rounds != 1 || normal) { |
---|
| 2717 | Vprintf("%s though ", co); |
---|
| 2718 | if (f_rounds != 1) { |
---|
| 2719 | Vprintf("the rounding is unusual"); |
---|
| 2720 | if (normal) Vprintf(" and "); |
---|
| 2721 | } |
---|
| 2722 | if (normal) Vprintf("the normalisation is unusual"); |
---|
| 2723 | Vprintf("%s\n", oc); |
---|
| 2724 | } |
---|
| 2725 | } else { |
---|
| 2726 | Vprintf("%sIt doesn't look like IEEE format%s\n", |
---|
| 2727 | co, oc); |
---|
| 2728 | } |
---|
| 2729 | } |
---|
| 2730 | printf("\n"); /* regardless of verbosity */ |
---|
| 2731 | return f_mant_dig; |
---|
| 2732 | } |
---|
| 2733 | |
---|
| 2734 | Procedure EPROP(fprec, dprec, lprec) int fprec, dprec, lprec; { |
---|
| 2735 | /* See if expressions are evaluated in extended precision. |
---|
| 2736 | Some compilers optimise even if you don't want it, |
---|
| 2737 | and then this function fails to produce the right result. |
---|
| 2738 | We try to diagnose this if it happens. |
---|
| 2739 | */ |
---|
| 2740 | Volatile int eprec; |
---|
| 2741 | Volatile double a, b, base, old; |
---|
| 2742 | Volatile Number d, oldd, dbase, one, zero; |
---|
| 2743 | Volatile int bad=0; |
---|
| 2744 | |
---|
| 2745 | /* Size of significand **************************************/ |
---|
| 2746 | a=1.0; |
---|
| 2747 | if (setjmp(lab) == 0) { /* Yields nothing */ |
---|
| 2748 | do { old=a; a=a+a; } |
---|
| 2749 | while ((((a+1.0)-a)-1.0) == 0.0 && a>old); |
---|
| 2750 | } else bad=1; |
---|
| 2751 | |
---|
| 2752 | /* Avoid the comparison if bad is set, |
---|
| 2753 | to avoid trouble on the convex. */ |
---|
| 2754 | if (!bad && (a <= old)) bad=1; |
---|
| 2755 | |
---|
| 2756 | if (!bad) { |
---|
| 2757 | b=1.0; |
---|
| 2758 | if (setjmp(lab) == 0) { /* Yields nothing */ |
---|
| 2759 | do { old=b; b=b+b; } |
---|
| 2760 | while ((base=((a+b)-a)) == 0.0 && b>old); |
---|
| 2761 | if (b <= old) bad=1; |
---|
| 2762 | } else bad=1; |
---|
| 2763 | } |
---|
| 2764 | |
---|
| 2765 | if (!bad) { |
---|
| 2766 | eprec=0; d=1.0; dbase=base; one=1.0; zero=0.0; |
---|
| 2767 | if (setjmp(lab) == 0) { /* Yields nothing */ |
---|
| 2768 | do { eprec++; oldd=d; d=d*dbase; } |
---|
| 2769 | while ((((d+one)-d)-one) == zero && d>oldd); |
---|
| 2770 | if (d <= oldd) bad=1; |
---|
| 2771 | } else bad=1; |
---|
| 2772 | } |
---|
| 2773 | |
---|
| 2774 | Unexpected(31); |
---|
| 2775 | |
---|
| 2776 | if (bad) { |
---|
| 2777 | Vprintf("%sCan't determine precision for %s expressions:\n%s%s\n", |
---|
| 2778 | co, thing, " check that you compiled without optimisation!", |
---|
| 2779 | oc); |
---|
| 2780 | } else if (eprec==dprec) { |
---|
| 2781 | Vprintf("%s%s expressions are evaluated in double precision%s\n", |
---|
| 2782 | co, Thing, oc); |
---|
| 2783 | } else if (eprec==fprec) { |
---|
| 2784 | Vprintf("%s%s expressions are evaluated in float precision%s\n", |
---|
| 2785 | co, Thing, oc); |
---|
| 2786 | } else if (eprec==lprec) { |
---|
| 2787 | Vprintf("%s%s expressions are evaluated in long double precision%s\n", |
---|
| 2788 | co, Thing, oc); |
---|
| 2789 | } else { |
---|
| 2790 | Vprintf("%s%s expressions are evaluated in a %s %s %d %s%s\n", |
---|
| 2791 | co, Thing, eprec>dprec ? "higher" : "lower", |
---|
| 2792 | "precision than double,\n using", |
---|
| 2793 | eprec, "base digits", |
---|
| 2794 | oc); |
---|
| 2795 | } |
---|
| 2796 | } |
---|
| 2797 | |
---|
| 2798 | #else /* not Number */ |
---|
| 2799 | |
---|
| 2800 | #ifdef FPROP /* Then create dummy routines for long double */ |
---|
| 2801 | /* ARGSUSED */ |
---|
| 2802 | int FPROP(bits_per_byte) int bits_per_byte; { return 0; } |
---|
| 2803 | #endif |
---|
| 2804 | #ifdef EPROP |
---|
| 2805 | /* ARGSUSED */ |
---|
| 2806 | Procedure EPROP(fprec, dprec, lprec) int fprec, dprec, lprec; {} |
---|
| 2807 | #endif |
---|
| 2808 | |
---|
| 2809 | #endif /* ifdef Number */ |
---|
| 2810 | |
---|
| 2811 | /* Increment the pass number */ |
---|
| 2812 | #undef PASS |
---|
| 2813 | |
---|
| 2814 | #ifdef PASS2 |
---|
| 2815 | #undef PASS2 |
---|
| 2816 | #define PASS 3 |
---|
| 2817 | #define PASS3 1 |
---|
| 2818 | #endif |
---|
| 2819 | |
---|
| 2820 | #ifdef PASS1 |
---|
| 2821 | #undef PASS1 |
---|
| 2822 | #define PASS 2 |
---|
| 2823 | #define PASS2 1 |
---|
| 2824 | #endif |
---|
| 2825 | |
---|
| 2826 | #ifdef PASS0 |
---|
| 2827 | #undef PASS0 |
---|
| 2828 | #endif |
---|
| 2829 | |
---|
| 2830 | #ifdef PASS /* then rescan this file */ |
---|
| 2831 | #ifdef NO_FILE |
---|
| 2832 | #include "enquire.c" |
---|
| 2833 | #else |
---|
| 2834 | #include FILENAME /* if this line fails to compile, define NO_FILE */ |
---|
| 2835 | #endif |
---|
| 2836 | #endif /* PASS */ |
---|
| 2837 | |
---|