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avoid use of modf; not portable

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This commit is contained in:
ceriel 1988-04-22 14:17:34 +00:00
parent b68e30f6ff
commit d3da6b76dc
1 changed files with 17 additions and 9 deletions
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26
mach/i86/ncg/mach.c
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@ -64,8 +64,7 @@ con_float() {
double atof(); double atof();
int i; int i;
#ifndef OWNFLOAT #ifndef OWNFLOAT
double f1; double frexp();
double frexp(), modf();
int j; int j;
int sign = 0; int sign = 0;
int fraction[4] ; int fraction[4] ;
@ -107,15 +106,18 @@ con_float() {
f += f; f += f;
i --; i --;
} }
f = modf(2 * f, &f1); /* hidden bit */ f = 2*f - 1.0; /* hidden bit */
#ifdef IEEEFLOAT #ifdef IEEEFLOAT
if (argval == 4) { if (argval == 4) {
#endif IEEEFLOAT #endif IEEEFLOAT
i = (i + 128) & 0377; i = (i + 128) & 0377;
fraction[0] = (sign << 15) | (i << 7); fraction[0] = (sign << 15) | (i << 7);
for (j = 6; j>= 0; j--) { for (j = 6; j>= 0; j--) {
if (f >= 0.5) fraction[0] |= (1 << j); f *= 2;
f = modf(2*f, &f1); if (f >= 1.0) {
f -= 1.0;
fraction[0] |= (1 << j);
}
} }
#ifdef IEEEFLOAT #ifdef IEEEFLOAT
} }
@ -123,16 +125,22 @@ con_float() {
i = (i + 1024) & 03777; i = (i + 1024) & 03777;
fraction[0] = (sign << 15) | (i << 4); fraction[0] = (sign << 15) | (i << 4);
for (j = 3; j>= 0; j--) { for (j = 3; j>= 0; j--) {
if (f >= 0.5) fraction[0] |= (1 << j); f *= 2;
f = modf(2*f, &f1); if (f >= 1.0) {
fraction[0] |= (1 << j);
f -= 1.0;
}
} }
} }
#endif IEEEFLOAT #endif IEEEFLOAT
for (i = 1; i < argval / 2; i++) { for (i = 1; i < argval / 2; i++) {
fraction[i] = 0; fraction[i] = 0;
for (j = 15; j>= 0; j--) { for (j = 15; j>= 0; j--) {
if (f >= 0.5) fraction[i] |= (1 << j); f *= 2;
f = modf(2*f, &f1); if (f >= 1.0) {
fraction[i] |= (1 << j);
f -= 1.0;
}
} }
} }
if (f >= 0.5) { if (f >= 0.5) {