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| author | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-10-18 17:44:07 -0700 |
|---|---|---|
| committer | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-10-19 17:31:03 -0700 |
| commit | b412213eee0afa3b51dfe92b736dfc7c981309f5 (patch) | |
| tree | 1f4279f8ab3483f106f43613f6bf066bcbafe8bf /benchtests/bench-strnlen.c | |
| parent | 4af6844aa5d3577e327f15dd877a38a043cb236a (diff) | |
| download | glibc-b412213eee0afa3b51dfe92b736dfc7c981309f5.tar glibc-b412213eee0afa3b51dfe92b736dfc7c981309f5.tar.gz glibc-b412213eee0afa3b51dfe92b736dfc7c981309f5.tar.bz2 glibc-b412213eee0afa3b51dfe92b736dfc7c981309f5.zip | |
x86: Optimize strrchr-evex.S and implement with VMM headers
Optimization is:
1. Cache latest result in "fast path" loop with `vmovdqu` instead of
`kunpckdq`. This helps if there are more than one matches.
Code Size Changes:
strrchr-evex.S : +30 bytes (Same number of cache lines)
Net perf changes:
Reported as geometric mean of all improvements / regressions from N=10
runs of the benchtests. Value as New Time / Old Time so < 1.0 is
improvement and 1.0 is regression.
strrchr-evex.S : 0.932 (From cases with higher match frequency)
Full results attached in email.
Full check passes on x86-64.
Diffstat (limited to 'benchtests/bench-strnlen.c')
0 files changed, 0 insertions, 0 deletions