mirror of
https://github.com/jart/cosmopolitan.git
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d5312b60f7
This change makes pthread_mutex_lock() as fast as _spinlock() by default. Thread instability issues on NetBSD have been resolved. Improvements made to gdtoa thread code. Crash reporting will now synchronize between threads in a slightly better way.
134 lines
5.1 KiB
C
134 lines
5.1 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│vi: set et ft=c ts=8 tw=8 fenc=utf-8 :vi│
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ The author of this software is David M. Gay. │
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│ Please send bug reports to David M. Gay <dmg@acm.org> │
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│ or Justine Tunney <jtunney@gmail.com> │
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│ │
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│ Copyright (C) 1998, 1999 by Lucent Technologies │
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│ All Rights Reserved │
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│ │
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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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│ │
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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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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "third_party/gdtoa/gdtoa.internal.h"
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/* clang-format off */
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int
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__gdtoa_strtoIg(const char *s00, char **se, const FPI *fpi, Long *exp, Bigint **B, int *rvp)
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{
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Bigint *b, *b1;
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int i, nb, nw, nw1, rv, rv1, swap;
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unsigned int nb1, nb11;
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Long e1;
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ThInfo *TI = 0;
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b = *B;
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rv = strtodg(s00, se, fpi, exp, b->x);
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if (!(rv & STRTOG_Inexact)) {
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B[1] = 0;
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return *rvp = rv;
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}
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e1 = exp[0];
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rv1 = rv ^ STRTOG_Inexact;
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b1 = __gdtoa_Balloc(b->k, &TI);
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Bcopy(b1, b);
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nb = fpi->nbits;
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nb1 = nb & 31;
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nb11 = (nb1 - 1) & 31;
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nw = b->wds;
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nw1 = nw - 1;
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if (rv & STRTOG_Inexlo) {
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swap = 0;
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b1 = __gdtoa_increment(b1, &TI);
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if ((rv & STRTOG_Retmask) == STRTOG_Zero) {
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if (fpi->sudden_underflow) {
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b1->x[0] = 0;
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b1->x[nw1] = 1L << nb11;
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rv1 += STRTOG_Normal - STRTOG_Zero;
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rv1 &= ~STRTOG_Underflow;
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goto swapcheck;
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}
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rv1 &= STRTOG_Inexlo | STRTOG_Underflow | STRTOG_Zero | STRTOG_Neg;
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rv1 |= STRTOG_Inexhi | STRTOG_Denormal;
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goto swapcheck;
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}
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if (b1->wds > nw
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|| (nb1 && b1->x[nw1] & 1L << nb1)) {
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if (++e1 > fpi->emax)
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rv1 = STRTOG_Infinite | STRTOG_Inexhi;
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__gdtoa_rshift(b1, 1);
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}
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else if ((rv & STRTOG_Retmask) == STRTOG_Denormal) {
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if (b1->x[nw1] & 1L << nb11) {
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rv1 += STRTOG_Normal - STRTOG_Denormal;
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rv1 &= ~STRTOG_Underflow;
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}
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}
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}
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else {
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swap = STRTOG_Neg;
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if ((rv & STRTOG_Retmask) == STRTOG_Infinite) {
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b1 = __gdtoa_set_ones(b1, nb, &TI);
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e1 = fpi->emax;
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rv1 = STRTOG_Normal | STRTOG_Inexlo | (rv & STRTOG_Neg);
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goto swapcheck;
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}
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__gdtoa_decrement(b1);
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if ((rv & STRTOG_Retmask) == STRTOG_Denormal) {
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for(i = nw1; !b1->x[i]; --i)
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if (!i) {
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rv1 = STRTOG_Zero | STRTOG_Inexlo | (rv & STRTOG_Neg);
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break;
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}
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goto swapcheck;
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}
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if (!(b1->x[nw1] & 1L << nb11)) {
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if (e1 == fpi->emin) {
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if (fpi->sudden_underflow)
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rv1 += STRTOG_Zero - STRTOG_Normal;
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else
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rv1 += STRTOG_Denormal - STRTOG_Normal;
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rv1 |= STRTOG_Underflow;
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}
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else {
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b1 = __gdtoa_lshift(b1, 1, &TI);
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b1->x[0] |= 1;
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--e1;
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}
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}
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}
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swapcheck:
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if (swap ^ (rv & STRTOG_Neg)) {
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rvp[0] = rv1;
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rvp[1] = rv;
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B[0] = b1;
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B[1] = b;
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exp[1] = exp[0];
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exp[0] = e1;
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}
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else {
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rvp[0] = rv;
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rvp[1] = rv1;
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B[1] = b1;
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exp[1] = e1;
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}
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return rv;
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}
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