mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
d8f619b393
This patch makes dbl-64 modf use libm_alias_double. Both the dbl-64 and dbl-64/wordsize-64 versions are changed, and the ldbl-opt version is changed to define the libc compat symbol only. Because of multiarch wrappers, the changed implementations are made not to define aliases at all if __modf is defined as a macro, as with other functions, so avoiding duplicate compat symbols while allowing those wrappers to be simplified. Tested for x86_64, and verified with build-many-glibcs.py that installed stripped shared libraries are unchanged by the patch. * sysdeps/ieee754/dbl-64/s_modf.c: Include <libm-alias-double.h>. (modf): Define using libm_alias_double, only if [!__modf]. * sysdeps/ieee754/dbl-64/wordsize-64/s_modf.c: Include <libm-alias-double.h>. (modf): Define using libm_alias_double, only if [!__modf]. * sysdeps/ieee754/ldbl-opt/s_modf.c (modfl): Only define libc compat symbol here. * sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_modf-ppc32.c (weak_alias): Do not undefine and redefine. (strong_alias): Likewise. * sysdeps/powerpc/powerpc64/fpu/multiarch/s_modf-ppc64.c (weak_alias): Likewise. (strong_alias): Likewise.
86 lines
2.0 KiB
C
86 lines
2.0 KiB
C
/*
|
|
* ====================================================
|
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
|
*
|
|
* Developed at SunPro, a Sun Microsystems, Inc. business.
|
|
* Permission to use, copy, modify, and distribute this
|
|
* software is freely granted, provided that this notice
|
|
* is preserved.
|
|
* ====================================================
|
|
*/
|
|
|
|
/*
|
|
* modf(double x, double *iptr)
|
|
* return fraction part of x, and return x's integral part in *iptr.
|
|
* Method:
|
|
* Bit twiddling.
|
|
*
|
|
* Exception:
|
|
* No exception.
|
|
*/
|
|
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
#include <libm-alias-double.h>
|
|
|
|
static const double one = 1.0;
|
|
|
|
double
|
|
__modf (double x, double *iptr)
|
|
{
|
|
int32_t i0, i1, j0;
|
|
uint32_t i;
|
|
EXTRACT_WORDS (i0, i1, x);
|
|
j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; /* exponent of x */
|
|
if (j0 < 20) /* integer part in high x */
|
|
{
|
|
if (j0 < 0) /* |x|<1 */
|
|
{
|
|
INSERT_WORDS (*iptr, i0 & 0x80000000, 0); /* *iptr = +-0 */
|
|
return x;
|
|
}
|
|
else
|
|
{
|
|
i = (0x000fffff) >> j0;
|
|
if (((i0 & i) | i1) == 0) /* x is integral */
|
|
{
|
|
*iptr = x;
|
|
INSERT_WORDS (x, i0 & 0x80000000, 0); /* return +-0 */
|
|
return x;
|
|
}
|
|
else
|
|
{
|
|
INSERT_WORDS (*iptr, i0 & (~i), 0);
|
|
return x - *iptr;
|
|
}
|
|
}
|
|
}
|
|
else if (__glibc_unlikely (j0 > 51)) /* no fraction part */
|
|
{
|
|
*iptr = x * one;
|
|
/* We must handle NaNs separately. */
|
|
if (j0 == 0x400 && ((i0 & 0xfffff) | i1))
|
|
return x * one;
|
|
INSERT_WORDS (x, i0 & 0x80000000, 0); /* return +-0 */
|
|
return x;
|
|
}
|
|
else /* fraction part in low x */
|
|
{
|
|
i = ((uint32_t) (0xffffffff)) >> (j0 - 20);
|
|
if ((i1 & i) == 0) /* x is integral */
|
|
{
|
|
*iptr = x;
|
|
INSERT_WORDS (x, i0 & 0x80000000, 0); /* return +-0 */
|
|
return x;
|
|
}
|
|
else
|
|
{
|
|
INSERT_WORDS (*iptr, i0, i1 & (~i));
|
|
return x - *iptr;
|
|
}
|
|
}
|
|
}
|
|
#ifndef __modf
|
|
libm_alias_double (__modf, modf)
|
|
#endif
|