mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 17:40:06 +00:00
b8682397ab
Bug 15384 notes that in __finite, two different constants are used that could be the same constant (the result only depends on the exponent of the floating-point representation), and that using the same constant is better for architectures where constants need loading from a constant pool. This patch implements that change. Tested for x86_64, mips64 and powerpc. [BZ #15384] * sysdeps/ieee754/dbl-64/s_finite.c (FINITE): Use same constant as bit-mask as in subtraction. * sysdeps/ieee754/dbl-64/wordsize-64/s_finite.c (__finite): Likewise. * sysdeps/ieee754/flt-32/s_finitef.c (FINITEF): Likewise. * sysdeps/ieee754/ldbl-128/s_finitel.c (__finitel): Likewise. * sysdeps/ieee754/ldbl-128ibm/s_finitel.c (__finitel): Likewise.
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/* s_finitel.c -- long double version of s_finite.c.
|
|
* Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
|
|
*/
|
|
|
|
/*
|
|
* ====================================================
|
|
* 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.
|
|
* ====================================================
|
|
*/
|
|
|
|
#if defined(LIBM_SCCS) && !defined(lint)
|
|
static char rcsid[] = "$NetBSD: $";
|
|
#endif
|
|
|
|
/*
|
|
* finitel(x) returns 1 is x is finite, else 0;
|
|
* no branching!
|
|
*/
|
|
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
#include <math_ldbl_opt.h>
|
|
|
|
int
|
|
___finitel (long double x)
|
|
{
|
|
uint64_t hx;
|
|
double xhi;
|
|
|
|
xhi = ldbl_high (x);
|
|
EXTRACT_WORDS64 (hx, xhi);
|
|
hx &= 0x7ff0000000000000LL;
|
|
hx -= 0x7ff0000000000000LL;
|
|
return hx >> 63;
|
|
}
|
|
hidden_ver (___finitel, __finitel)
|
|
weak_alias (___finitel, ____finitel)
|
|
#if IS_IN (libm)
|
|
long_double_symbol (libm, ____finitel, finitel);
|
|
long_double_symbol (libm, ___finitel, __finitel);
|
|
#else
|
|
long_double_symbol (libc, ____finitel, finitel);
|
|
long_double_symbol (libc, ___finitel, __finitel);
|
|
#endif
|