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