mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 01:40:07 +00:00
54142c44e9
Where glibc code needs to avoid excess range and precision in floating-point arithmetic, code variously uses either asms or volatile to force the results of that arithmetic to memory; mostly this is conditional on FLT_EVAL_METHOD, but in the case of lrint / llrint functions some use of volatile is unconditional (and is present unnecessarily in versions for long double). This patch make such code use the recently-added math_narrow_eval macro consistently, removing the unnecessary uses of volatile in long double lrint / llrint implementations completely. Tested for x86_64, x86, mips64 and powerpc. * math/s_nexttowardf.c (__nexttowardf): Use math_narrow_eval. * stdlib/strtod_l.c: Include <math_private.h>. (overflow_value): Use math_narrow_eval. (underflow_value): Likewise. * sysdeps/i386/fpu/s_nexttoward.c (__nexttoward): Likewise. * sysdeps/i386/fpu/s_nexttowardf.c (__nexttowardf): Likewise. * sysdeps/ieee754/dbl-64/e_gamma_r.c (gamma_positive): Likewise. (__ieee754_gamma_r): Likewise. * sysdeps/ieee754/dbl-64/gamma_productf.c (__gamma_productf): Likewise. * sysdeps/ieee754/dbl-64/k_rem_pio2.c (__kernel_rem_pio2): Likewise. * sysdeps/ieee754/dbl-64/lgamma_neg.c (__lgamma_neg): Likewise. * sysdeps/ieee754/dbl-64/s_erf.c (__erfc): Likewise. * sysdeps/ieee754/dbl-64/s_llrint.c (__llrint): Likewise. * sysdeps/ieee754/dbl-64/s_lrint.c (__lrint): Likewise. * sysdeps/ieee754/flt-32/e_gammaf_r.c (gammaf_positive): Likewise. (__ieee754_gammaf_r): Likewise. * sysdeps/ieee754/flt-32/k_rem_pio2f.c (__kernel_rem_pio2f): Likewise. * sysdeps/ieee754/flt-32/lgamma_negf.c (__lgamma_negf): Likewise. * sysdeps/ieee754/flt-32/s_erff.c (__erfcf): Likewise. * sysdeps/ieee754/flt-32/s_llrintf.c (__llrintf): Likewise. * sysdeps/ieee754/flt-32/s_lrintf.c (__lrintf): Likewise. * sysdeps/ieee754/ldbl-128/s_llrintl.c (__llrintl): Do not use volatile. * sysdeps/ieee754/ldbl-128/s_lrintl.c (__lrintl): Likewise. * sysdeps/ieee754/ldbl-128/s_nexttoward.c (__nexttoward): Use math_narrow_eval. * sysdeps/ieee754/ldbl-128ibm/s_nexttoward.c (__nexttoward): Likewise. * sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c (__nexttowardf): Likewise. * sysdeps/ieee754/ldbl-96/gamma_product.c (__gamma_product): Likewise. * sysdeps/ieee754/ldbl-96/s_llrintl.c (__llrintl): Do not use volatile. * sysdeps/ieee754/ldbl-96/s_lrintl.c (__lrintl): Likewise. * sysdeps/ieee754/ldbl-96/s_nexttoward.c (__nexttoward): Use math_narrow_eval. * sysdeps/ieee754/ldbl-96/s_nexttowardf.c (__nexttowardf): Likewise. * sysdeps/ieee754/ldbl-opt/s_nexttowardfd.c (__nldbl_nexttowardf): Likewise.
93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/* Round argument to nearest integral value according to current rounding
|
|
direction.
|
|
Copyright (C) 1997-2015 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <math.h>
|
|
|
|
#include <math_private.h>
|
|
|
|
static const double two52[2] =
|
|
{
|
|
4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
|
|
-4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */
|
|
};
|
|
|
|
|
|
long long int
|
|
__llrint (double x)
|
|
{
|
|
int32_t j0;
|
|
u_int32_t i1, i0;
|
|
long long int result;
|
|
double w;
|
|
double t;
|
|
int sx;
|
|
|
|
EXTRACT_WORDS (i0, i1, x);
|
|
j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
|
|
sx = i0 >> 31;
|
|
i0 &= 0xfffff;
|
|
i0 |= 0x100000;
|
|
|
|
if (j0 < 20)
|
|
{
|
|
w = math_narrow_eval (two52[sx] + x);
|
|
t = w - two52[sx];
|
|
EXTRACT_WORDS (i0, i1, t);
|
|
j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
|
|
i0 &= 0xfffff;
|
|
i0 |= 0x100000;
|
|
|
|
result = (j0 < 0 ? 0 : i0 >> (20 - j0));
|
|
}
|
|
else if (j0 < (int32_t) (8 * sizeof (long long int)) - 1)
|
|
{
|
|
if (j0 >= 52)
|
|
result = (((long long int) i0 << 32) | i1) << (j0 - 52);
|
|
else
|
|
{
|
|
w = math_narrow_eval (two52[sx] + x);
|
|
t = w - two52[sx];
|
|
EXTRACT_WORDS (i0, i1, t);
|
|
j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
|
|
i0 &= 0xfffff;
|
|
i0 |= 0x100000;
|
|
|
|
if (j0 == 20)
|
|
result = (long long int) i0;
|
|
else
|
|
result = ((long long int) i0 << (j0 - 20)) | (i1 >> (52 - j0));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* The number is too large. It is left implementation defined
|
|
what happens. */
|
|
return (long long int) x;
|
|
}
|
|
|
|
return sx ? -result : result;
|
|
}
|
|
|
|
weak_alias (__llrint, llrint)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__llrint, __llrintl)
|
|
weak_alias (__llrint, llrintl)
|
|
#endif
|