mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-12 22:30:12 +00:00
a8c590f789
- math.h will use compiler builtin for gcc 4.4 when built without
-fsignaling-nans and the builtin is expanded inline for all
support architectures. As an example, there is no intra isinf
call on libm for the architecture I checked, x86, arm, aarch64,
and powerpc.
- The resulting binary difference on 32 bits architecture is minimum
for the non hotspot symbol.
- It helps wordsize-64 architectures that use ldbl-opt.
- It add some code simplification with reduction of duplicated
implementations.
Checked on powerpc-linux-gnu (built without --with-cpu, with
--with-cpu=power4 and with --with-cpu=power5+ and --disable-multi-arch),
powerpc64-linux-gnu (built without --with-cp and with --with-cpu=power5+
and --disable-multi-arch).
* sysdeps/ieee754/dbl-64/wordsize-64/s_isinf.c: Move to ...
* sysdeps/ieee754/dbl-64/s_isinf.c: ... here and format code.
Reviewed-by: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com>
35 lines
773 B
C
35 lines
773 B
C
/*
|
|
* Written by J.T. Conklin <jtc@netbsd.org>.
|
|
* Changed to return -1 for -Inf by Ulrich Drepper <drepper@cygnus.com>.
|
|
* Public domain.
|
|
*/
|
|
|
|
/*
|
|
* isinf(x) returns 1 is x is inf, -1 if x is -inf, else 0;
|
|
* no branching!
|
|
*/
|
|
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
#include <ldbl-classify-compat.h>
|
|
#include <shlib-compat.h>
|
|
|
|
int
|
|
__isinf (double x)
|
|
{
|
|
int64_t ix;
|
|
EXTRACT_WORDS64 (ix,x);
|
|
int64_t t = ix & UINT64_C (0x7fffffffffffffff);
|
|
t ^= UINT64_C (0x7ff0000000000000);
|
|
t |= -t;
|
|
return ~(t >> 63) & (ix >> 62);
|
|
}
|
|
hidden_def (__isinf)
|
|
weak_alias (__isinf, isinf)
|
|
#ifdef NO_LONG_DOUBLE
|
|
# if LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)
|
|
compat_symbol (libc, __isinf, __isinfl, GLIBC_2_0);
|
|
# endif
|
|
weak_alias (__isinf, isinfl)
|
|
#endif
|