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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-03-26 17:47:54 +0000 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-06-12 14:32:39 -0300 |
| commit | a72186761b2ed913fd5ea3df2de2aa446456aa98 (patch) | |
| tree | 23c6543f27da2882bd7bd53f7d48c389a6bf47b6 /sysdeps/ieee754/dbl-64/s_finite.c | |
| parent | 6427a6ac8cfe6c6e64214db606c5dced67213e8d (diff) | |
| download | glibc-a72186761b2ed913fd5ea3df2de2aa446456aa98.tar.gz glibc-a72186761b2ed913fd5ea3df2de2aa446456aa98.tar.xz glibc-a72186761b2ed913fd5ea3df2de2aa446456aa98.zip | |
math: Use wordsize-64 version for finite
- 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 finite
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_finite.c: Move to ...
* sysdeps/ieee754/dbl-64/s_finite.c: ... here and format code.
Reviewed-by: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com>
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_finite.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_finite.c | 22 |
1 files changed, 7 insertions, 15 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_finite.c b/sysdeps/ieee754/dbl-64/s_finite.c index da1519b1d0..98a40fbff6 100644 --- a/sysdeps/ieee754/dbl-64/s_finite.c +++ b/sysdeps/ieee754/dbl-64/s_finite.c @@ -1,4 +1,3 @@ -/* @(#)s_finite.c 5.1 93/09/24 */ /* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. @@ -10,10 +9,6 @@ * ==================================================== */ -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: s_finite.c,v 1.8 1995/05/10 20:47:17 jtc Exp $"; -#endif - /* * finite(x) returns 1 is x is finite, else 0; * no branching! @@ -23,18 +18,15 @@ static char rcsid[] = "$NetBSD: s_finite.c,v 1.8 1995/05/10 20:47:17 jtc Exp $"; #include <math_private.h> #include <ldbl-classify-compat.h> #include <shlib-compat.h> +#include <stdint.h> -#undef __finite - -#ifndef FINITE -# define FINITE __finite -#endif - -int FINITE(double x) +int +__finite (double x) { - int32_t hx; - GET_HIGH_WORD (hx, x); - return (int) ((uint32_t) ((hx & 0x7ff00000) - 0x7ff00000) >> 31); + int64_t lx; + EXTRACT_WORDS64 (lx,x); + return (int)((uint64_t)((lx & INT64_C(0x7ff0000000000000)) + - INT64_C (0x7ff0000000000000)) >> 63); } hidden_def (__finite) weak_alias (__finite, finite) |