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| author | H.J. Lu <hjl.tools@gmail.com> | 2018-01-08 08:04:26 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2018-01-08 08:04:40 -0800 |
| commit | c70e4e9c9efff9df4c847dd7cfd81bae674219ab (patch) | |
| tree | 46cbbfb74a8c03e933fc4245c66559def374b1a8 /NEWS | |
| parent | 579396ee082565ab5f42ff166a264891223b7b82 (diff) | |
| download | glibc-c70e4e9c9efff9df4c847dd7cfd81bae674219ab.zip glibc-c70e4e9c9efff9df4c847dd7cfd81bae674219ab.tar.gz glibc-c70e4e9c9efff9df4c847dd7cfd81bae674219ab.tar.bz2 | |
x86-64: Add sincosf with vector FMA
Since the x86-64 assembly version of sincosf is higly optimized with
vector instructions, there isn't much room for improvement. However
s_sincosf.c written in C with vector math and intrinsics can be
optimized by GCC with FMA.
On Skylake, bench-sincosf reports performance improvement:
Assembly FMA improvement
max 104.042 101.008 3%
min 9.426 8.586 10%
mean 20.6209 18.2238 13%
* sysdeps/x86_64/fpu/multiarch/Makefile (libm-sysdep_routines):
Add s_sincosf-sse2 and s_sincosf-fma.
(CFLAGS-s_sincosf-fma.c): New.
* sysdeps/x86_64/fpu/multiarch/s_sincosf-fma.c: New file.
* sysdeps/x86_64/fpu/multiarch/s_sincosf-sse2.S: Likewise.
* sysdeps/x86_64/fpu/multiarch/s_sincosf.c: Likewise.
* sysdeps/x86_64/fpu/s_sincosf.S: Don't add alias if
__sincosf is defined.
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 4 |
1 files changed, 2 insertions, 2 deletions
@@ -19,8 +19,8 @@ Major new features: supported on i386, x86_64, x32 and aarch64. * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf, - sinf and tan with FMA, contributed by Arjan van de Ven and H.J. Lu - from Intel. + sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and + H.J. Lu from Intel. * Optimized x86-64 trunc and truncf for processors with SSE4.1. |