184 lines
4.0 KiB
C
184 lines
4.0 KiB
C
/****************************************************************
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Copyright (C) 1997, 1998 Lucent Technologies
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of Lucent or any of its entities
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not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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****************************************************************/
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/* Try to deduce arith.h from arithmetic properties. */
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#include <stdio.h>
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static int dalign;
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typedef struct
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Akind {
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char *name;
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int kind;
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} Akind;
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static Akind
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IEEE_8087 = { "IEEE_8087", 1 },
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IEEE_MC68k = { "IEEE_MC68k", 2 },
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IBM = { "IBM", 3 },
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VAX = { "VAX", 4 },
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CRAY = { "CRAY", 5};
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static Akind *
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Lcheck()
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{
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union {
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double d;
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long L[2];
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} u;
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struct {
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double d;
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long L;
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} x[2];
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if (sizeof(x) > 2*(sizeof(double) + sizeof(long)))
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dalign = 1;
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u.L[0] = u.L[1] = 0;
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u.d = 1e13;
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if (u.L[0] == 1117925532 && u.L[1] == -448790528)
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return &IEEE_MC68k;
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if (u.L[1] == 1117925532 && u.L[0] == -448790528)
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return &IEEE_8087;
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if (u.L[0] == -2065213935 && u.L[1] == 10752)
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return &VAX;
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if (u.L[0] == 1267827943 && u.L[1] == 704643072)
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return &IBM;
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return 0;
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}
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static Akind *
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icheck()
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{
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union {
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double d;
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int L[2];
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} u;
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struct {
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double d;
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int L;
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} x[2];
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if (sizeof(x) > 2*(sizeof(double) + sizeof(int)))
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dalign = 1;
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u.L[0] = u.L[1] = 0;
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u.d = 1e13;
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if (u.L[0] == 1117925532 && u.L[1] == -448790528)
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return &IEEE_MC68k;
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if (u.L[1] == 1117925532 && u.L[0] == -448790528)
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return &IEEE_8087;
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if (u.L[0] == -2065213935 && u.L[1] == 10752)
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return &VAX;
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if (u.L[0] == 1267827943 && u.L[1] == 704643072)
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return &IBM;
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return 0;
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}
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char *emptyfmt = ""; /* avoid possible warning message with printf("") */
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static Akind *
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ccheck()
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{
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union {
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double d;
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long L;
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} u;
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long Cray1;
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/* Cray1 = 4617762693716115456 -- without overflow on non-Crays */
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Cray1 = printf(emptyfmt) < 0 ? 0 : 4617762;
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if (printf(emptyfmt, Cray1) >= 0)
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Cray1 = 1000000*Cray1 + 693716;
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if (printf(emptyfmt, Cray1) >= 0)
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Cray1 = 1000000*Cray1 + 115456;
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u.d = 1e13;
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if (u.L == Cray1)
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return &CRAY;
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return 0;
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}
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static int
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fzcheck()
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{
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double a, b;
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int i;
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a = 1.;
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b = .1;
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for(i = 155;; b *= b, i >>= 1) {
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if (i & 1) {
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a *= b;
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if (i == 1)
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break;
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}
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}
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b = a * a;
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return b == 0.;
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}
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int
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main()
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{
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Akind *a = 0;
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int Ldef = 0;
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FILE *f;
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#ifdef WRITE_ARITH_H /* for Symantec's buggy "make" */
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f = fopen("arith.h", "w");
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if (!f) {
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printf("Cannot open arith.h\n");
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return 1;
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}
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#else
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f = stdout;
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#endif
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if (sizeof(double) == 2*sizeof(long))
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a = Lcheck();
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else if (sizeof(double) == 2*sizeof(int)) {
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Ldef = 1;
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a = icheck();
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}
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else if (sizeof(double) == sizeof(long))
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a = ccheck();
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if (a) {
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fprintf(f, "#define %s\n#define Arith_Kind_ASL %d\n",
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a->name, a->kind);
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if (Ldef)
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fprintf(f, "#define Long int\n#define Intcast (int)(long)\n");
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if (dalign)
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fprintf(f, "#define Double_Align\n");
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if (sizeof(char*) == 8)
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fprintf(f, "#define X64_bit_pointers\n");
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#ifndef NO_LONG_LONG
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if (sizeof(long long) < 8)
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#endif
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fprintf(f, "#define NO_LONG_LONG\n");
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if (a->kind <= 2 && fzcheck())
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fprintf(f, "#define Sudden_Underflow\n");
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return 0;
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}
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fprintf(f, "/* Unknown arithmetic */\n");
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return 1;
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}
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