diff options
| author | Ling Ma <ling.ml@alibaba-inc.com> | 2014-06-19 13:00:56 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2014-06-19 15:14:08 -0700 |
| commit | 5c74e47cd628a6fcd2e4eba021301e275f8a95a3 (patch) | |
| tree | b85959ae1a65bc526d683807213027115886d96d /ChangeLog | |
| parent | 4d43ef1e7434d7d419afbcd754931cb0c794763c (diff) | |
| download | glibc-5c74e47cd628a6fcd2e4eba021301e275f8a95a3.tar glibc-5c74e47cd628a6fcd2e4eba021301e275f8a95a3.tar.gz glibc-5c74e47cd628a6fcd2e4eba021301e275f8a95a3.tar.bz2 glibc-5c74e47cd628a6fcd2e4eba021301e275f8a95a3.zip | |
Add x86_64 memset optimized for AVX2
In this patch we take advantage of HSW memory bandwidth, manage to
reduce miss branch prediction by avoiding using branch instructions and
force destination to be aligned with avx & avx2 instruction.
The CPU2006 403.gcc benchmark indicates this patch improves performance
from 26% to 59%.
* sysdeps/x86_64/multiarch/Makefile: Add memset-avx2.
* sysdeps/x86_64/multiarch/memset-avx2.S: New file.
* sysdeps/x86_64/multiarch/memset.S: Likewise.
* sysdeps/x86_64/multiarch/memset_chk.S: Likewise.
* sysdeps/x86_64/multiarch/rtld-memset.S: Likewise.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 9 |
1 files changed, 9 insertions, 0 deletions
@@ -1,3 +1,12 @@ +2014-06-19 Ling Ma <ling.ml@alibaba-inc.com> + H.J. Lu <hongjiu.lu@intel.com> + + * sysdeps/x86_64/multiarch/Makefile: Add memset-avx2. + * sysdeps/x86_64/multiarch/memset-avx2.S: New file. + * sysdeps/x86_64/multiarch/memset.S: Likewise. + * sysdeps/x86_64/multiarch/memset_chk.S: Likewise. + * sysdeps/x86_64/multiarch/rtld-memset.S: Likewise. + 2014-06-19 Andreas Schwab <schwab@linux-m68k.org> [BZ #17069] |