mirror of git://sourceware.org/git/glibc.git
c19457aec6
This patch optimizes large size copy using normal store when src > dst and overlap. Make it the same as the logic in memmove-vec-unaligned-erms.S. Current memmove-ssse3 use '__x86_shared_cache_size_half' as the non- temporal threshold, this patch updates that value to '__x86_shared_non_temporal_threshold'. Currently, the __x86_shared_non_temporal_threshold is cpu-specific, and different CPUs will have different values based on the related nt-benchmark results. However, in memmove-ssse3, the nontemporal threshold uses '__x86_shared_cache_size_half', which sounds unreasonable. The performance is not changed drastically although shows overall improvements without any major regressions or gains. Results on Zhaoxin KX-7000: bench-memcpy geometric_mean(N=20) New / Original: 0.999 bench-memcpy-random geometric_mean(N=20) New / Original: 0.999 bench-memcpy-large geometric_mean(N=20) New / Original: 0.978 bench-memmove geometric_mean(N=20) New / Original: 1.000 bench-memmmove-large geometric_mean(N=20) New / Original: 0.962 Results on Intel Core i5-6600K: bench-memcpy geometric_mean(N=20) New / Original: 1.001 bench-memcpy-random geometric_mean(N=20) New / Original: 0.999 bench-memcpy-large geometric_mean(N=20) New / Original: 1.001 bench-memmove geometric_mean(N=20) New / Original: 0.995 bench-memmmove-large geometric_mean(N=20) New / Original: 0.936 Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com> |
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| sh | ||
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| wordsize-32 | ||
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| x86_64 | ||