gdtoa-strtopdd-fbsd.c [plain text]
#include "xlocale_private.h"
#include "gdtoaimp.h"
#ifdef __APPLE__
#define fixLDBL(x) ((x) += 0.L)
#endif
int
#ifdef KR_headers
strtopdd(s, sp, dd, loc) CONST char *s; char **sp; double *dd; locale_t loc;
#else
strtopdd(CONST char *s, char **sp, double *dd, locale_t loc)
#endif
{
#ifdef Sudden_Underflow
static FPI fpi0 = { 106, 1-1023, 2046-1023-106+1, 1, 1 };
#else
static FPI fpi0 = { 106, 1-1023-53+1, 2046-1023-106+1, 1, 0 };
#endif
ULong bits[4];
Long exp;
int i, j, rv;
typedef union {
double d[2];
ULong L[4];
#ifdef __APPLE__
long double ld;
#endif
} U;
U *u;
#ifdef Honor_FLT_ROUNDS
#include "gdtoa_fltrnds.h"
#else
#define fpi &fpi0
#endif
rv = strtodg(s, sp, fpi, &exp, bits, loc);
u = (U*)dd;
switch(rv & STRTOG_Retmask) {
case STRTOG_NoNumber:
u->d[0] = u->d[1] = 0.;
return rv;
case STRTOG_Zero:
u->d[0] = u->d[1] = 0.;
break;
case STRTOG_Normal:
u->L[_1] = (bits[1] >> 21 | bits[2] << 11) & 0xffffffffL;
u->L[_0] = bits[2] >> 21 | bits[3] << 11 & 0xfffff
| exp + 0x3ff + 105 << 20;
exp += 0x3ff + 52;
if (bits[1] &= 0x1fffff) {
i = hi0bits(bits[1]) - 11;
if (i >= exp) {
i = exp - 1;
exp = 0;
}
else
exp -= i;
if (i > 0) {
bits[1] = bits[1] << i | bits[0] >> 32-i;
bits[0] = bits[0] << i & 0xffffffffL;
}
}
else if (bits[0]) {
i = hi0bits(bits[0]) + 21;
if (i >= exp) {
i = exp - 1;
exp = 0;
}
else
exp -= i;
if (i < 32) {
bits[1] = bits[0] >> 32 - i;
bits[0] = bits[0] << i & 0xffffffffL;
}
else {
bits[1] = bits[0] << i - 32;
bits[0] = 0;
}
}
else {
u->L[2] = u->L[3] = 0;
break;
}
u->L[2+_1] = bits[0];
u->L[2+_0] = bits[1] & 0xfffff | exp << 20;
#ifdef __APPLE__
fixLDBL(u->ld);
#endif
break;
case STRTOG_Denormal:
if (bits[3])
goto nearly_normal;
if (bits[2])
goto partly_normal;
if (bits[1] & 0xffe00000)
goto hardly_normal;
u->L[2] = u->L[3] = 0;
u->L[_1] = bits[0];
u->L[_0] = bits[1];
break;
nearly_normal:
i = hi0bits(bits[3]) - 11;
j = 32 - i;
u->L[_0] = (bits[3] << i | bits[2] >> j) & 0xfffff
| 65 - i << 20;
u->L[_1] = (bits[2] << i | bits[1] >> j) & 0xffffffffL;
u->L[2+_0] = bits[1] & (1L << j) - 1;
u->L[2+_1] = bits[0];
#ifdef __APPLE__
fixLDBL(u->ld);
#endif
break;
partly_normal:
i = hi0bits(bits[2]) - 11;
if (i < 0) {
j = -i;
i += 32;
u->L[_0] = bits[2] >> j & 0xfffff | (33 + j) << 20;
u->L[_1] = (bits[2] << i | bits[1] >> j) & 0xffffffffL;
u->L[2+_0] = bits[1] & (1L << j) - 1;
u->L[2+_1] = bits[0];
#ifdef __APPLE__
fixLDBL(u->ld);
#endif
break;
}
if (i == 0) {
u->L[_0] = bits[2] & 0xfffff | 33 << 20;
u->L[_1] = bits[1];
u->L[2+_0] = 0;
u->L[2+_1] = bits[0];
#ifdef __APPLE__
fixLDBL(u->ld);
#endif
break;
}
j = 32 - i;
u->L[_0] = (bits[2] << i | bits[1] >> j) & 0xfffff
| j + 1 << 20;
u->L[_1] = (bits[1] << i | bits[0] >> j) & 0xffffffffL;
u->L[2+_0] = 0;
u->L[2+_1] = bits[0] & (1L << j) - 1;
#ifdef __APPLE__
fixLDBL(u->ld);
#endif
break;
hardly_normal:
j = 11 - hi0bits(bits[1]);
i = 32 - j;
u->L[_0] = bits[1] >> j & 0xfffff | j + 1 << 20;
u->L[_1] = (bits[1] << i | bits[0] >> j) & 0xffffffffL;
u->L[2+_0] = 0;
u->L[2+_1] = bits[0] & (1L << j) - 1;
#ifdef __APPLE__
fixLDBL(u->ld);
#endif
break;
case STRTOG_Infinite:
#ifdef __APPLE__
u->L[_0] = 0x7ff00000;
u->L[_1] = u->L[2+_0] = u->L[2+_1] = 0;
#else
u->L[_0] = u->L[2+_0] = 0x7ff00000;
u->L[_1] = u->L[2+_1] = 0;
#endif
break;
case STRTOG_NaN:
#ifdef __APPLE__
u->L[0] = d_QNAN0;
u->L[1] = d_QNAN1;
u->L[2] = u->L[3] = 0;
#else
u->L[0] = u->L[2] = d_QNAN0;
u->L[1] = u->L[3] = d_QNAN1;
#endif
break;
#ifdef __APPLE__
case STRTOG_NaNbits:
u->L[0] = d_QNAN0 | ((bits[2] >> 20 | bits[3] << 12) & 0xfffff);
u->L[1] = d_QNAN1 | bits[1] >> 20 | bits[2] << 12;
u->L[2] = u->L[3] = 0;
#endif
}
if (rv & STRTOG_Neg) {
u->L[ _0] |= 0x80000000L;
#ifdef __APPLE__
u->L[2+_0] ^= 0x80000000L;
#else
u->L[2+_0] |= 0x80000000L;
#endif
}
return rv;
}