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x86: Enable non-temporal memset for Hygon processors
This patch uses 'Avoid_Non_Temporal_Memset' flag to access the non-temporal memset implementation for hygon processors. Test Results: hygon1 arch x86_memset_non_temporal_threshold = 8MB size new performance time / old performance time 1MB 0.994 4MB 0.996 8MB 0.670 16MB 0.343 32MB 0.355 hygon2 arch x86_memset_non_temporal_threshold = 8MB size new performance time / old performance time 1MB 1 4MB 1 8MB 1.312 16MB 0.822 32MB 0.830 hygon3 arch x86_memset_non_temporal_threshold = 8MB size new performance time / old performance time 1MB 1 4MB 0.990 8MB 0.737 16MB 0.390 32MB 0.401 For hygon arch with this patch, non-temporal stores can improve performance by 20% - 65%. Signed-off-by: Feifei Wang <wangfeifei@hygon.cn> Reviewed-by: Jing Li <lijing@hygon.cn> Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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@ -756,9 +756,9 @@ init_cpu_features (struct cpu_features *cpu_features)
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unsigned int stepping = 0;
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enum cpu_features_kind kind;
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/* Default is avoid non-temporal memset for non Intel/AMD hardware. This is,
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/* Default is avoid non-temporal memset for non Intel/AMD/Hygon hardware. This is,
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as of writing this, we only have benchmarks indicatings it profitability
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on Intel/AMD. */
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on Intel/AMD/Hygon. */
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cpu_features->preferred[index_arch_Avoid_Non_Temporal_Memset]
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|= bit_arch_Avoid_Non_Temporal_Memset;
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@ -1116,6 +1116,11 @@ https://www.intel.com/content/www/us/en/support/articles/000059422/processors.ht
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get_extended_indices (cpu_features);
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update_active (cpu_features);
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/* Benchmarks indicate non-temporal memset can be profitable on Hygon
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hardware. */
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cpu_features->preferred[index_arch_Avoid_Non_Temporal_Memset]
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&= ~bit_arch_Avoid_Non_Temporal_Memset;
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}
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else
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{
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@ -1071,7 +1071,7 @@ dl_init_cacheinfo (struct cpu_features *cpu_features)
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/* Non-temporal stores are more performant on some hardware above
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non_temporal_threshold. Currently Prefer_Non_Temporal is set for for both
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Intel and AMD hardware. */
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Intel, AMD and Hygon hardware. */
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unsigned long int memset_non_temporal_threshold = SIZE_MAX;
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if (!CPU_FEATURES_ARCH_P (cpu_features, Avoid_Non_Temporal_Memset))
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memset_non_temporal_threshold = non_temporal_threshold;
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