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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-03-26 17:32:26 +0000 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-06-12 14:32:39 -0300 |
| commit | a8c590f7896ab661df873e64ad0cbb559d399dbf (patch) | |
| tree | f1a0bde11bbffb6bb6ce68ed623a00176e475c69 /sysdeps/ieee754/dbl-64/s_isinf.c | |
| parent | 2666f96390b8283cf8dacd0d0f268bf06ff10eb8 (diff) | |
| download | glibc-a8c590f7896ab661df873e64ad0cbb559d399dbf.tar.gz glibc-a8c590f7896ab661df873e64ad0cbb559d399dbf.tar.xz glibc-a8c590f7896ab661df873e64ad0cbb559d399dbf.zip | |
math: Use wordsize-64 version for isinf
- 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>
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_isinf.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_isinf.c | 15 |
1 files changed, 6 insertions, 9 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_isinf.c b/sysdeps/ieee754/dbl-64/s_isinf.c index 93eb65c147..e5300fd2a5 100644 --- a/sysdeps/ieee754/dbl-64/s_isinf.c +++ b/sysdeps/ieee754/dbl-64/s_isinf.c @@ -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) |