mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
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.
686 lines
19 KiB
C
686 lines
19 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set et ft=c ts=8 tw=8 fenc=utf-8 :vi│
|
|
╚──────────────────────────────────────────────────────────────────────────────╝
|
|
│ │
|
|
│ The author of this software is David M. Gay. │
|
|
│ Please send bug reports to David M. Gay <dmg@acm.org> │
|
|
│ or Justine Tunney <jtunney@gmail.com> │
|
|
│ │
|
|
│ Copyright (C) 1998, 1999 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. │
|
|
│ │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "third_party/gdtoa/gdtoa.internal.h"
|
|
/* clang-format off */
|
|
|
|
static Bigint *
|
|
bitstob(ULong *bits, int nbits, int *bbits, ThInfo **PTI)
|
|
{
|
|
int i, k;
|
|
Bigint *b;
|
|
ULong *be, *x, *x0;
|
|
i = ULbits;
|
|
k = 0;
|
|
while(i < nbits) {
|
|
i <<= 1;
|
|
k++;
|
|
}
|
|
b = __gdtoa_Balloc(k, PTI);
|
|
be = bits + ((nbits - 1) >> kshift);
|
|
x = x0 = b->x;
|
|
do {
|
|
*x++ = *bits & ALL_ON;
|
|
} while(++bits <= be);
|
|
i = x - x0;
|
|
while(!x0[--i])
|
|
if (!i) {
|
|
b->wds = 0;
|
|
*bbits = 0;
|
|
goto ret;
|
|
}
|
|
b->wds = i + 1;
|
|
*bbits = i*ULbits + 32 - hi0bits(b->x[i]);
|
|
ret:
|
|
return b;
|
|
}
|
|
|
|
/* dtoa for IEEE arithmetic (dmg): convert double to ASCII string.
|
|
*
|
|
* Inspired by "How to Print Floating-Point Numbers Accurately" by
|
|
* Guy L. Steele, Jr. and Jon L. White [Proc. ACM SIGPLAN '90, pp. 112-126].
|
|
*
|
|
* Modifications:
|
|
* 1. Rather than iterating, we use a simple numeric overestimate
|
|
* to determine k = floor(log10(d)). We scale relevant
|
|
* quantities using O(log2(k)) rather than O(k) __gdtoa_multiplications.
|
|
* 2. For some modes > 2 (corresponding to ecvt and fcvt), we don't
|
|
* try to generate digits strictly left to right. Instead, we
|
|
* compute with fewer bits and propagate the carry if necessary
|
|
* when rounding the final digit up. This is often faster.
|
|
* 3. Under the as__gdtoa_sumption that input will be rounded nearest,
|
|
* mode 0 renders 1e23 as 1e23 rather than 9.999999999999999e22.
|
|
* That is, we allow equality in stopping tests when the
|
|
* round-nearest rule will give the same floating-point value
|
|
* as would satisfaction of the stopping test with strict
|
|
* inequality.
|
|
* 4. We remove common factors of powers of 2 from relevant
|
|
* quantities.
|
|
* 5. When converting floating-point integers less than 1e16,
|
|
* we use floating-point arithmetic rather than resorting
|
|
* to __gdtoa_multiple-precision integers.
|
|
* 6. When asked to produce fewer than 15 digits, we first try
|
|
* to get by with floating-point arithmetic; we resort to
|
|
* __gdtoa_multiple-precision integer arithmetic only if we cannot
|
|
* guarantee that the floating-point calculation has given
|
|
* the correctly rounded result. For k requested digits and
|
|
* "uniformly" distributed input, the probability is
|
|
* something like 10^(k-15) that we must resort to the Long
|
|
* calculation.
|
|
*/
|
|
|
|
char *
|
|
gdtoa(const FPI *fpi, int be, ULong *bits, int *kindp, int mode, int ndigits, int *decpt, char **rve)
|
|
{
|
|
/* Arguments ndigits and decpt are similar to the second and third
|
|
arguments of ecvt and fcvt; trailing zeros are suppressed from
|
|
the returned string. If not null, *rve is set to point
|
|
to the end of the return value. If d is +-Infinity or NaN,
|
|
then *decpt is set to 9999.
|
|
be = exponent: value = (integer represented by bits) * (2 to the power of be).
|
|
|
|
mode:
|
|
0 ==> shortest string that yields d when read in
|
|
and rounded to nearest.
|
|
1 ==> like 0, but with Steele & White stopping rule;
|
|
e.g. with IEEE P754 arithmetic , mode 0 gives
|
|
1e23 whereas mode 1 gives 9.999999999999999e22.
|
|
2 ==> max(1,ndigits) significant digits. This gives a
|
|
return value similar to that of ecvt, except
|
|
that trailing zeros are suppressed.
|
|
3 ==> through ndigits past the decimal point. This
|
|
gives a return value similar to that from fcvt,
|
|
except that trailing zeros are suppressed, and
|
|
ndigits can be negative.
|
|
4-9 should give the same return values as 2-3, i.e.,
|
|
4 <= mode <= 9 ==> same return as mode
|
|
2 + (mode & 1). These modes are mainly for
|
|
debugging; often they run slower but sometimes
|
|
faster than modes 2-3.
|
|
4,5,8,9 ==> left-to-right digit gene__gdtoa_ration.
|
|
6-9 ==> don't try fast floating-point estimate
|
|
(if applicable).
|
|
|
|
Values of mode other than 0-9 are treated as mode 0.
|
|
|
|
Sufficient space is allocated to the return value
|
|
to hold the suppressed trailing zeros.
|
|
*/
|
|
|
|
ThInfo *TI = 0;
|
|
int bbits, b2, b5, be0, dig, i, ieps, ilim, ilim0, ilim1, inex;
|
|
int j, j1, k, k0, k_check, kind, leftright, m2, m5, nbits;
|
|
int rdir, s2, s5, spec_case, try_quick;
|
|
Long L;
|
|
Bigint *b, *b1, *delta, *mlo, *mhi, *mhi1, *S;
|
|
double d2, ds;
|
|
char *s, *s0;
|
|
U d, eps;
|
|
inex = 0;
|
|
kind = *kindp &= ~STRTOG_Inexact;
|
|
switch(kind & STRTOG_Retmask) {
|
|
case STRTOG_Zero:
|
|
goto ret_zero;
|
|
case STRTOG_Normal:
|
|
case STRTOG_Denormal:
|
|
break;
|
|
case STRTOG_Infinite:
|
|
*decpt = -32768;
|
|
return __gdtoa_nrv_alloc("Infinity", rve, 8, &TI);
|
|
case STRTOG_NaN:
|
|
*decpt = -32768;
|
|
return __gdtoa_nrv_alloc("NaN", rve, 3, &TI);
|
|
default:
|
|
return 0;
|
|
}
|
|
b = bitstob(bits, nbits = fpi->nbits, &bbits, &TI);
|
|
be0 = be;
|
|
if ( (i = __gdtoa_trailz(b)) !=0) {
|
|
__gdtoa_rshift(b, i);
|
|
be += i;
|
|
bbits -= i;
|
|
}
|
|
if (!b->wds) {
|
|
__gdtoa_Bfree(b, &TI);
|
|
ret_zero:
|
|
*decpt = 1;
|
|
return __gdtoa_nrv_alloc("0", rve, 1, &TI);
|
|
}
|
|
dval(&d) = __gdtoa_b2d(b, &i);
|
|
i = be + bbits - 1;
|
|
word0(&d) &= Frac_mask1;
|
|
word0(&d) |= Exp_11;
|
|
/* log(x) ~=~ log(1.5) + (x-1.5)/1.5
|
|
* log10(x) = log(x) / log(10)
|
|
* ~=~ log(1.5)/log(10) + (x-1.5)/(1.5*log(10))
|
|
* log10(&d) = (i-Bias)*log(2)/log(10) + log10(d2)
|
|
*
|
|
* This suggests computing an approximation k to log10(&d) by
|
|
*
|
|
* k = (i - Bias)*0.301029995663981
|
|
* + ( (d2-1.5)*0.289529654602168 + 0.176091259055681 );
|
|
*
|
|
* We want k to be too large rather than too small.
|
|
* The error in the first-order Taylor series approximation
|
|
* is in our favor, so we just round up the constant enough
|
|
* to compensate for any error in the __gdtoa_multiplication of
|
|
* (i - Bias) by 0.301029995663981; since |i - Bias| <= 1077,
|
|
* and 1077 * 0.30103 * 2^-52 ~=~ 7.2e-14,
|
|
* adding 1e-13 to the constant term more than suffices.
|
|
* Hence we adjust the constant term to 0.1760912590558.
|
|
* (We could get a more accurate k by invoking log10,
|
|
* but this is probably not worthwhile.)
|
|
*/
|
|
ds = (dval(&d)-1.5)*0.289529654602168 + 0.1760912590558 + i*0.301029995663981;
|
|
/* correct as__gdtoa_sumption about exponent range */
|
|
if ((j = i) < 0)
|
|
j = -j;
|
|
if ((j -= 1077) > 0)
|
|
ds += j * 7e-17;
|
|
k = (int)ds;
|
|
if (ds < 0. && ds != k)
|
|
k--; /* want k = floor(ds) */
|
|
k_check = 1;
|
|
// TODO: word0(&d) += (be + bbits - 1) << Exp_shift;
|
|
// error: third_party/gdtoa/gdtoa.c:244: left shift of negative value -6 'int' 20 'int'
|
|
// 4161d8: __die at libc/log/die.c:33
|
|
// 463165: __ubsan_abort at libc/intrin/ubsan.c:270
|
|
// 4632d6: __ubsan_handle_shift_out_of_bounds at libc/intrin/ubsan.c:299
|
|
// 421d42: gdtoa at third_party/gdtoa/gdtoa.c:244
|
|
// 420449: g_dfmt_p at third_party/gdtoa/g_dfmt_p.c:105
|
|
// 413947: ConvertMatrixToStringTable at tool/viz/lib/formatmatrix-double.c:40
|
|
// 413a5f: FormatMatrixDouble at tool/viz/lib/formatmatrix-double.c:55
|
|
// 413b13: StringifyMatrixDouble at tool/viz/lib/formatmatrix-double.c:65
|
|
// 464923: GetChromaticAdaptationMatrix_testD65ToD50_soWeCanCieLab at test/dsp/core/illumination_test.c:39
|
|
// 4650c2: testlib_runtestcases at libc/testlib/testrunner.c:94
|
|
// 464676: testlib_runalltests at libc/testlib/runner.c:37
|
|
// 46455e: main at libc/testlib/testmain.c:84
|
|
// 401d30: cosmo at libc/runtime/cosmo.S:65
|
|
// 401173: _start at libc/crt/crt.S:67
|
|
word0(&d) += (unsigned)(be + bbits - 1) << Exp_shift;
|
|
if (k >= 0 && k <= Ten_pmax) {
|
|
if (dval(&d) < __gdtoa_tens[k])
|
|
k--;
|
|
k_check = 0;
|
|
}
|
|
j = bbits - i - 1;
|
|
if (j >= 0) {
|
|
b2 = 0;
|
|
s2 = j;
|
|
}
|
|
else {
|
|
b2 = -j;
|
|
s2 = 0;
|
|
}
|
|
if (k >= 0) {
|
|
b5 = 0;
|
|
s5 = k;
|
|
s2 += k;
|
|
}
|
|
else {
|
|
b2 -= k;
|
|
b5 = -k;
|
|
s5 = 0;
|
|
}
|
|
if (mode < 0 || mode > 9)
|
|
mode = 0;
|
|
try_quick = 1;
|
|
if (mode > 5) {
|
|
mode -= 4;
|
|
try_quick = 0;
|
|
}
|
|
else if (i >= -4 - Emin || i < Emin)
|
|
try_quick = 0;
|
|
leftright = 1;
|
|
ilim = ilim1 = -1; /* Values for cases 0 and 1; done here to */
|
|
/* silence erroneous "gcc -Wall" warning. */
|
|
switch(mode) {
|
|
case 0:
|
|
case 1:
|
|
i = (int)(nbits * .30103) + 3;
|
|
ndigits = 0;
|
|
break;
|
|
case 2:
|
|
leftright = 0;
|
|
/* no break */
|
|
case 4:
|
|
if (ndigits <= 0)
|
|
ndigits = 1;
|
|
ilim = ilim1 = i = ndigits;
|
|
break;
|
|
case 3:
|
|
leftright = 0;
|
|
/* no break */
|
|
case 5:
|
|
i = ndigits + k + 1;
|
|
ilim = i;
|
|
ilim1 = i - 1;
|
|
if (i <= 0)
|
|
i = 1;
|
|
}
|
|
s = s0 = __gdtoa_rv_alloc(i, &TI);
|
|
if (mode <= 1)
|
|
rdir = 0;
|
|
else if ( (rdir = fpi->rounding - 1) !=0) {
|
|
if (rdir < 0)
|
|
rdir = 2;
|
|
if (kind & STRTOG_Neg)
|
|
rdir = 3 - rdir;
|
|
}
|
|
/* Now rdir = 0 ==> round near, 1 ==> round up, 2 ==> round down. */
|
|
if (ilim >= 0 && ilim <= Quick_max && try_quick && !rdir && k == 0) {
|
|
/* Try to get by with floating-point arithmetic. */
|
|
i = 0;
|
|
d2 = dval(&d);
|
|
k0 = k;
|
|
ilim0 = ilim;
|
|
ieps = 2; /* conservative */
|
|
if (k > 0) {
|
|
ds = __gdtoa_tens[k&0xf];
|
|
j = k >> 4;
|
|
if (j & Bletch) {
|
|
/* prevent overflows */
|
|
j &= Bletch - 1;
|
|
dval(&d) /= __gdtoa_bigtens[n___gdtoa_bigtens-1];
|
|
ieps++;
|
|
}
|
|
for(; j; j >>= 1, i++)
|
|
if (j & 1) {
|
|
ieps++;
|
|
ds *= __gdtoa_bigtens[i];
|
|
}
|
|
}
|
|
else {
|
|
ds = 1.;
|
|
if ( (j1 = -k) !=0) {
|
|
dval(&d) *= __gdtoa_tens[j1 & 0xf];
|
|
for(j = j1 >> 4; j; j >>= 1, i++)
|
|
if (j & 1) {
|
|
ieps++;
|
|
dval(&d) *= __gdtoa_bigtens[i];
|
|
}
|
|
}
|
|
}
|
|
if (k_check && dval(&d) < 1. && ilim > 0) {
|
|
if (ilim1 <= 0)
|
|
goto fast_failed;
|
|
ilim = ilim1;
|
|
k--;
|
|
dval(&d) *= 10.;
|
|
ieps++;
|
|
}
|
|
dval(&eps) = ieps*dval(&d) + 7.;
|
|
word0(&eps) -= (P-1)*Exp_msk1;
|
|
if (ilim == 0) {
|
|
S = mhi = 0;
|
|
dval(&d) -= 5.;
|
|
if (dval(&d) > dval(&eps))
|
|
goto one_digit;
|
|
if (dval(&d) < -dval(&eps))
|
|
goto no_digits;
|
|
goto fast_failed;
|
|
}
|
|
if (leftright) {
|
|
/* Use Steele & White method of only
|
|
* generating digits needed.
|
|
*/
|
|
dval(&eps) = ds*0.5/__gdtoa_tens[ilim-1] - dval(&eps);
|
|
for(i = 0;;) {
|
|
L = (Long)(dval(&d)/ds);
|
|
dval(&d) -= L*ds;
|
|
*s++ = '0' + (int)L;
|
|
if (dval(&d) < dval(&eps)) {
|
|
if (dval(&d))
|
|
inex = STRTOG_Inexlo;
|
|
goto ret1;
|
|
}
|
|
if (ds - dval(&d) < dval(&eps))
|
|
goto bump_up;
|
|
if (++i >= ilim)
|
|
break;
|
|
dval(&eps) *= 10.;
|
|
dval(&d) *= 10.;
|
|
}
|
|
}
|
|
else {
|
|
/* Generate ilim digits, then fix them up. */
|
|
dval(&eps) *= __gdtoa_tens[ilim-1];
|
|
for(i = 1;; i++, dval(&d) *= 10.) {
|
|
if ( (L = (Long)(dval(&d)/ds)) !=0)
|
|
dval(&d) -= L*ds;
|
|
*s++ = '0' + (int)L;
|
|
if (i == ilim) {
|
|
ds *= 0.5;
|
|
if (dval(&d) > ds + dval(&eps))
|
|
goto bump_up;
|
|
else if (dval(&d) < ds - dval(&eps)) {
|
|
if (dval(&d))
|
|
inex = STRTOG_Inexlo;
|
|
goto ret1;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
fast_failed:
|
|
s = s0;
|
|
dval(&d) = d2;
|
|
k = k0;
|
|
ilim = ilim0;
|
|
}
|
|
/* Do we have a "small" integer? */
|
|
if (be >= 0 && k <= fpi->int_max) {
|
|
/* Yes. */
|
|
ds = __gdtoa_tens[k];
|
|
if (ndigits < 0 && ilim <= 0) {
|
|
S = mhi = 0;
|
|
if (ilim < 0 || dval(&d) <= 5*ds)
|
|
goto no_digits;
|
|
goto one_digit;
|
|
}
|
|
for(i = 1;; i++, dval(&d) *= 10.) {
|
|
L = dval(&d) / ds;
|
|
dval(&d) -= L*ds;
|
|
/* If FLT_ROUNDS == 2, L will usually be high by 1 */
|
|
if (dval(&d) < 0) {
|
|
L--;
|
|
dval(&d) += ds;
|
|
}
|
|
*s++ = '0' + (int)L;
|
|
if (dval(&d) == 0.)
|
|
break;
|
|
if (i == ilim) {
|
|
if (rdir) {
|
|
if (rdir == 1)
|
|
goto bump_up;
|
|
inex = STRTOG_Inexlo;
|
|
goto ret1;
|
|
}
|
|
dval(&d) += dval(&d);
|
|
if (dval(&d) > ds || (dval(&d) == ds && L & 1))
|
|
{
|
|
bump_up:
|
|
inex = STRTOG_Inexhi;
|
|
while(*--s == '9')
|
|
if (s == s0) {
|
|
k++;
|
|
*s = '0';
|
|
break;
|
|
}
|
|
++*s++;
|
|
}
|
|
else
|
|
inex = STRTOG_Inexlo;
|
|
break;
|
|
}
|
|
}
|
|
goto ret1;
|
|
}
|
|
m2 = b2;
|
|
m5 = b5;
|
|
mhi = mlo = 0;
|
|
if (leftright) {
|
|
i = nbits - bbits;
|
|
if (be - i++ < fpi->emin && mode != 3 && mode != 5) {
|
|
/* denormal */
|
|
i = be - fpi->emin + 1;
|
|
if (mode >= 2 && ilim > 0 && ilim < i)
|
|
goto small_ilim;
|
|
}
|
|
else if (mode >= 2) {
|
|
small_ilim:
|
|
j = ilim - 1;
|
|
if (m5 >= j)
|
|
m5 -= j;
|
|
else {
|
|
s5 += j -= m5;
|
|
b5 += j;
|
|
m5 = 0;
|
|
}
|
|
if ((i = ilim) < 0) {
|
|
m2 -= i;
|
|
i = 0;
|
|
}
|
|
}
|
|
b2 += i;
|
|
s2 += i;
|
|
mhi = __gdtoa_i2b(1, &TI);
|
|
}
|
|
if (m2 > 0 && s2 > 0) {
|
|
i = m2 < s2 ? m2 : s2;
|
|
b2 -= i;
|
|
m2 -= i;
|
|
s2 -= i;
|
|
}
|
|
if (b5 > 0) {
|
|
if (leftright) {
|
|
if (m5 > 0) {
|
|
mhi = __gdtoa_pow5mult(mhi, m5, &TI);
|
|
b1 = __gdtoa_mult(mhi, b, &TI);
|
|
__gdtoa_Bfree(b, &TI);
|
|
b = b1;
|
|
}
|
|
if ( (j = b5 - m5) !=0)
|
|
b = __gdtoa_pow5mult(b, j, &TI);
|
|
}
|
|
else
|
|
b = __gdtoa_pow5mult(b, b5, &TI);
|
|
}
|
|
S = __gdtoa_i2b(1, &TI);
|
|
if (s5 > 0)
|
|
S = __gdtoa_pow5mult(S, s5, &TI);
|
|
/* Check for special case that d is a normalized power of 2. */
|
|
spec_case = 0;
|
|
if (mode < 2) {
|
|
if (bbits == 1 && be0 > fpi->emin + 1) {
|
|
/* The special case */
|
|
b2++;
|
|
s2++;
|
|
spec_case = 1;
|
|
}
|
|
}
|
|
/* Arrange for convenient computation of quotients:
|
|
* shift left if necessary so divisor has 4 leading 0 bits.
|
|
*
|
|
* Perhaps we should just compute leading 28 bits of S once
|
|
* and for all and pass them and a shift to __gdtoa_quorem, so it
|
|
* can do shifts and ors to compute the numerator for q.
|
|
*/
|
|
i = ((s5 ? hi0bits(S->x[S->wds-1]) : ULbits - 1) - s2 - 4) & kmask;
|
|
m2 += i;
|
|
if ((b2 += i) > 0)
|
|
b = __gdtoa_lshift(b, b2, &TI);
|
|
if ((s2 += i) > 0)
|
|
S = __gdtoa_lshift(S, s2, &TI);
|
|
if (k_check) {
|
|
if (__gdtoa_cmp(b,S) < 0) {
|
|
k--;
|
|
b = __gdtoa_multadd(b, 10, 0, &TI); /* we botched the k estimate */
|
|
if (leftright)
|
|
mhi = __gdtoa_multadd(mhi, 10, 0, &TI);
|
|
ilim = ilim1;
|
|
}
|
|
}
|
|
if (ilim <= 0 && mode > 2) {
|
|
if (ilim < 0 || __gdtoa_cmp(b,S = __gdtoa_multadd(S,5,0,&TI)) <= 0) {
|
|
/* no digits, fcvt style */
|
|
no_digits:
|
|
k = -1 - ndigits;
|
|
inex = STRTOG_Inexlo;
|
|
goto ret;
|
|
}
|
|
one_digit:
|
|
inex = STRTOG_Inexhi;
|
|
*s++ = '1';
|
|
k++;
|
|
goto ret;
|
|
}
|
|
if (leftright) {
|
|
if (m2 > 0)
|
|
mhi = __gdtoa_lshift(mhi, m2, &TI);
|
|
/* Compute mlo -- check for special case
|
|
* that d is a normalized power of 2.
|
|
*/
|
|
mlo = mhi;
|
|
if (spec_case) {
|
|
mhi = __gdtoa_Balloc(mhi->k, &TI);
|
|
Bcopy(mhi, mlo);
|
|
mhi = __gdtoa_lshift(mhi, 1, &TI);
|
|
}
|
|
for(i = 1;;i++) {
|
|
dig = __gdtoa_quorem(b,S) + '0';
|
|
/* Do we yet have the shortest decimal string
|
|
* that will round to d?
|
|
*/
|
|
j = __gdtoa_cmp(b, mlo);
|
|
delta = __gdtoa_diff(S, mhi, &TI);
|
|
j1 = delta->sign ? 1 : __gdtoa_cmp(b, delta);
|
|
__gdtoa_Bfree(delta, &TI);
|
|
if (j1 == 0 && !mode && !(bits[0] & 1) && !rdir) {
|
|
if (dig == '9')
|
|
goto round_9_up;
|
|
if (j <= 0) {
|
|
if (b->wds > 1 || b->x[0])
|
|
inex = STRTOG_Inexlo;
|
|
}
|
|
else {
|
|
dig++;
|
|
inex = STRTOG_Inexhi;
|
|
}
|
|
*s++ = dig;
|
|
goto ret;
|
|
}
|
|
if (j < 0 || (j == 0 && !mode && !(bits[0] & 1))) {
|
|
if (rdir && (b->wds > 1 || b->x[0])) {
|
|
if (rdir == 2) {
|
|
inex = STRTOG_Inexlo;
|
|
goto accept;
|
|
}
|
|
while (__gdtoa_cmp(S,mhi) > 0) {
|
|
*s++ = dig;
|
|
mhi1 = __gdtoa_multadd(mhi, 10, 0, &TI);
|
|
if (mlo == mhi)
|
|
mlo = mhi1;
|
|
mhi = mhi1;
|
|
b = __gdtoa_multadd(b, 10, 0, &TI);
|
|
dig = __gdtoa_quorem(b,S) + '0';
|
|
}
|
|
if (dig++ == '9')
|
|
goto round_9_up;
|
|
inex = STRTOG_Inexhi;
|
|
goto accept;
|
|
}
|
|
if (j1 > 0) {
|
|
b = __gdtoa_lshift(b, 1, &TI);
|
|
j1 = __gdtoa_cmp(b, S);
|
|
if ((j1 > 0 || (j1 == 0 && dig & 1)) && dig++ == '9')
|
|
goto round_9_up;
|
|
inex = STRTOG_Inexhi;
|
|
}
|
|
if (b->wds > 1 || b->x[0])
|
|
inex = STRTOG_Inexlo;
|
|
accept:
|
|
*s++ = dig;
|
|
goto ret;
|
|
}
|
|
if (j1 > 0 && rdir != 2) {
|
|
if (dig == '9') { /* possible if i == 1 */
|
|
round_9_up:
|
|
*s++ = '9';
|
|
inex = STRTOG_Inexhi;
|
|
goto roundoff;
|
|
}
|
|
inex = STRTOG_Inexhi;
|
|
*s++ = dig + 1;
|
|
goto ret;
|
|
}
|
|
*s++ = dig;
|
|
if (i == ilim)
|
|
break;
|
|
b = __gdtoa_multadd(b, 10, 0, &TI);
|
|
if (mlo == mhi)
|
|
mlo = mhi = __gdtoa_multadd(mhi, 10, 0, &TI);
|
|
else {
|
|
mlo = __gdtoa_multadd(mlo, 10, 0, &TI);
|
|
mhi = __gdtoa_multadd(mhi, 10, 0, &TI);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
for(i = 1;; i++) {
|
|
*s++ = dig = __gdtoa_quorem(b,S) + '0';
|
|
if (i >= ilim)
|
|
break;
|
|
b = __gdtoa_multadd(b, 10, 0, &TI);
|
|
}
|
|
/* Round off last digit */
|
|
if (rdir) {
|
|
if (rdir == 2 || (b->wds <= 1 && !b->x[0]))
|
|
goto chopzeros;
|
|
goto roundoff;
|
|
}
|
|
b = __gdtoa_lshift(b, 1, &TI);
|
|
j = __gdtoa_cmp(b, S);
|
|
if (j > 0 || (j == 0 && dig & 1))
|
|
{
|
|
roundoff:
|
|
inex = STRTOG_Inexhi;
|
|
while(*--s == '9')
|
|
if (s == s0) {
|
|
k++;
|
|
*s++ = '1';
|
|
goto ret;
|
|
}
|
|
++*s++;
|
|
}
|
|
else {
|
|
chopzeros:
|
|
if (b->wds > 1 || b->x[0])
|
|
inex = STRTOG_Inexlo;
|
|
}
|
|
ret:
|
|
__gdtoa_Bfree(S, &TI);
|
|
if (mhi) {
|
|
if (mlo && mlo != mhi)
|
|
__gdtoa_Bfree(mlo, &TI);
|
|
__gdtoa_Bfree(mhi, &TI);
|
|
}
|
|
ret1:
|
|
while(s > s0 && s[-1] == '0')
|
|
--s;
|
|
__gdtoa_Bfree(b, &TI);
|
|
*s = 0;
|
|
*decpt = k + 1;
|
|
if (rve)
|
|
*rve = s;
|
|
*kindp |= inex;
|
|
return s0;
|
|
}
|