2003-03-12 20:18:32 +00:00
|
|
|
/****************************************************************
|
|
|
|
|
|
|
|
|
|
The author of this software is David M. Gay.
|
|
|
|
|
|
|
|
|
|
Copyright (C) 1998 by 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.
|
|
|
|
|
|
|
|
|
|
****************************************************************/
|
|
|
|
|
|
2007-01-03 04:58:54 +00:00
|
|
|
/* Please send bug reports to David M. Gay (dmg at acm dot org,
|
|
|
|
|
* with " at " changed at "@" and " dot " changed to "."). */
|
2003-03-12 20:18:32 +00:00
|
|
|
|
|
|
|
|
#include "gdtoaimp.h"
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
#ifdef KR_headers
|
|
|
|
|
strtoIg(s00, se, fpi, exp, B, rvp) CONST char *s00; char **se; FPI *fpi; Long *exp; Bigint **B; int *rvp;
|
|
|
|
|
#else
|
|
|
|
|
strtoIg(CONST char *s00, char **se, FPI *fpi, Long *exp, Bigint **B, int *rvp)
|
|
|
|
|
#endif
|
|
|
|
|
{
|
|
|
|
|
Bigint *b, *b1;
|
|
|
|
|
int i, nb, nw, nw1, rv, rv1, swap;
|
|
|
|
|
unsigned int nb1, nb11;
|
|
|
|
|
Long e1;
|
|
|
|
|
|
|
|
|
|
b = *B;
|
|
|
|
|
rv = strtodg(s00, se, fpi, exp, b->x);
|
|
|
|
|
if (!(rv & STRTOG_Inexact)) {
|
|
|
|
|
B[1] = 0;
|
|
|
|
|
return *rvp = rv;
|
|
|
|
|
}
|
|
|
|
|
e1 = exp[0];
|
|
|
|
|
rv1 = rv ^ STRTOG_Inexact;
|
|
|
|
|
b1 = Balloc(b->k);
|
|
|
|
|
Bcopy(b1, b);
|
|
|
|
|
nb = fpi->nbits;
|
|
|
|
|
nb1 = nb & 31;
|
|
|
|
|
nb11 = (nb1 - 1) & 31;
|
|
|
|
|
nw = b->wds;
|
|
|
|
|
nw1 = nw - 1;
|
|
|
|
|
if (rv & STRTOG_Inexlo) {
|
|
|
|
|
swap = 0;
|
|
|
|
|
b1 = increment(b1);
|
|
|
|
|
if (fpi->sudden_underflow
|
|
|
|
|
&& (rv & STRTOG_Retmask) == STRTOG_Zero) {
|
|
|
|
|
b1->x[0] = 0;
|
|
|
|
|
b1->x[nw1] = 1L << nb11;
|
|
|
|
|
rv1 += STRTOG_Normal - STRTOG_Zero;
|
|
|
|
|
rv1 &= ~STRTOG_Underflow;
|
|
|
|
|
goto swapcheck;
|
|
|
|
|
}
|
|
|
|
|
if (b1->wds > nw
|
|
|
|
|
|| nb1 && b1->x[nw1] & 1L << nb1) {
|
|
|
|
|
if (++e1 > fpi->emax)
|
|
|
|
|
rv1 = STRTOG_Infinite | STRTOG_Inexhi;
|
|
|
|
|
rshift(b1, 1);
|
|
|
|
|
}
|
|
|
|
|
else if ((rv & STRTOG_Retmask) == STRTOG_Denormal) {
|
|
|
|
|
if (b1->x[nw1] & 1L << nb11) {
|
|
|
|
|
rv1 += STRTOG_Normal - STRTOG_Denormal;
|
|
|
|
|
rv1 &= ~STRTOG_Underflow;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
else {
|
|
|
|
|
swap = STRTOG_Neg;
|
|
|
|
|
if ((rv & STRTOG_Retmask) == STRTOG_Infinite) {
|
|
|
|
|
b1 = set_ones(b1, nb);
|
|
|
|
|
e1 = fpi->emax;
|
|
|
|
|
rv1 = STRTOG_Normal | STRTOG_Inexlo;
|
|
|
|
|
goto swapcheck;
|
|
|
|
|
}
|
|
|
|
|
decrement(b1);
|
|
|
|
|
if ((rv & STRTOG_Retmask) == STRTOG_Denormal) {
|
|
|
|
|
for(i = nw1; !b1->x[i]; --i)
|
|
|
|
|
if (!i) {
|
|
|
|
|
rv1 = STRTOG_Zero | STRTOG_Inexlo;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
goto swapcheck;
|
|
|
|
|
}
|
|
|
|
|
if (!(b1->x[nw1] & 1L << nb11)) {
|
|
|
|
|
if (e1 == fpi->emin) {
|
|
|
|
|
if (fpi->sudden_underflow)
|
|
|
|
|
rv1 += STRTOG_Zero - STRTOG_Normal;
|
|
|
|
|
else
|
|
|
|
|
rv1 += STRTOG_Denormal - STRTOG_Normal;
|
|
|
|
|
rv1 |= STRTOG_Underflow;
|
|
|
|
|
}
|
|
|
|
|
else {
|
|
|
|
|
b1 = lshift(b1, 1);
|
|
|
|
|
b1->x[0] |= 1;
|
|
|
|
|
--e1;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
swapcheck:
|
|
|
|
|
if (swap ^ (rv & STRTOG_Neg)) {
|
|
|
|
|
rvp[0] = rv1;
|
|
|
|
|
rvp[1] = rv;
|
|
|
|
|
B[0] = b1;
|
|
|
|
|
B[1] = b;
|
|
|
|
|
exp[1] = exp[0];
|
|
|
|
|
exp[0] = e1;
|
|
|
|
|
}
|
|
|
|
|
else {
|
|
|
|
|
rvp[0] = rv;
|
|
|
|
|
rvp[1] = rv1;
|
|
|
|
|
B[1] = b1;
|
|
|
|
|
exp[1] = e1;
|
|
|
|
|
}
|
|
|
|
|
return rv;
|
|
|
|
|
}
|
