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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-03-26 13:32:19 +0000 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-06-12 14:32:18 -0300 |
| commit | 197dbda1a155324bfc52ae1bc3cc26e57955c1cf (patch) | |
| tree | f1f086a11f7ae0fa4847b30f160ce02f142e1569 /sysdeps/ieee754/dbl-64/wordsize-64 | |
| parent | 2731a326b10ba6d1646043cf28290584238b7ce4 (diff) | |
| download | glibc-197dbda1a155324bfc52ae1bc3cc26e57955c1cf.tar.gz glibc-197dbda1a155324bfc52ae1bc3cc26e57955c1cf.tar.xz glibc-197dbda1a155324bfc52ae1bc3cc26e57955c1cf.zip | |
math: Use wordsize-64 version for isnan
- 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 isnan
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_isnan.c: Move to ...
* sysdeps/ieee754/dbl-64/s_isnan.c: ... here and format code.
Reviewed-by: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com>
Diffstat (limited to 'sysdeps/ieee754/dbl-64/wordsize-64')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c | 40 |
1 files changed, 0 insertions, 40 deletions
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c deleted file mode 100644 index cd805d157b..0000000000 --- a/sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c +++ /dev/null @@ -1,40 +0,0 @@ -/* @(#)s_isnan.c 5.1 93/09/24 */ -/* - * ==================================================== - * 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. - * ==================================================== - */ - -/* - * isnan(x) returns 1 is x is nan, else 0; - * no branching! - */ - -#include <math.h> -#include <math_private.h> -#include <ldbl-classify-compat.h> -#include <shlib-compat.h> -#include <stdint.h> - -#undef __isnan -int __isnan(double x) -{ - int64_t hx; - EXTRACT_WORDS64(hx,x); - hx &= UINT64_C(0x7fffffffffffffff); - hx = UINT64_C(0x7ff0000000000000) - hx; - return (int)(((uint64_t)hx)>>63); -} -hidden_def (__isnan) -weak_alias (__isnan, isnan) -#ifdef NO_LONG_DOUBLE -# if LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23) -compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0); -# endif -weak_alias (__isnan, isnanl) -#endif |