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math: Use wordsize-64 version for isinf

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- 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>
This commit is contained in:
Adhemerval Zanella 2019-03-26 17:32:26 +00:00
parent 2666f96390
commit a8c590f789
3 changed files with 9 additions and 43 deletions
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3
ChangeLog
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@ -1,5 +1,8 @@
2019-06-12 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sysdeps/ieee754/dbl-64/wordsize-64/s_isinf.c: Move to ...
* sysdeps/ieee754/dbl-64/s_isinf.c: ... here and format code.
* sysdeps/powerpc/fpu/s_isnan.c: Remove file.
* sysdeps/powerpc/fpu/s_isnanf.S: Likewise.
* sysdeps/powerpc/powerpc32/fpu/s_isnan.S: Likewise.

15
sysdeps/ieee754/dbl-64/s_isinf.c
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@ -4,10 +4,6 @@
* Public domain.
*/
#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: s_isinf.c,v 1.3 1995/05/11 23:20:14 jtc Exp $";
#endif
/*
* isinf(x) returns 1 is x is inf, -1 if x is -inf, else 0;
* no branching!
@ -21,11 +17,12 @@ static char rcsid[] = "$NetBSD: s_isinf.c,v 1.3 1995/05/11 23:20:14 jtc Exp $";
int
__isinf (double x)
{
int32_t hx, lx;
EXTRACT_WORDS (hx, lx, x);
lx |= (hx & 0x7fffffff) ^ 0x7ff00000;
lx |= -lx;
return ~(lx >> 31) & (hx >> 30);
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)

34
sysdeps/ieee754/dbl-64/wordsize-64/s_isinf.c
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@ -1,34 +0,0 @@
/*
* 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