forked from rpms/glibc
31 lines
1.2 KiB
Diff
31 lines
1.2 KiB
Diff
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commit 6484a92698039c4a7a510f0214e22d067b0d78b3
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Date: Thu Feb 8 10:08:39 2024 -0300
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x86: Do not prefer ERMS for memset on Zen3+
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For AMD Zen3+ architecture, the performance of the vectorized loop is
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slightly better than ERMS.
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Checked on x86_64-linux-gnu on Zen3.
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Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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(cherry picked from commit 272708884cb750f12f5c74a00e6620c19dc6d567)
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diff --git a/sysdeps/x86/dl-cacheinfo.h b/sysdeps/x86/dl-cacheinfo.h
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index f34d12846caf9422..5a98f70364220da4 100644
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--- a/sysdeps/x86/dl-cacheinfo.h
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+++ b/sysdeps/x86/dl-cacheinfo.h
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@@ -1021,6 +1021,11 @@ dl_init_cacheinfo (struct cpu_features *cpu_features)
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minimum value is fixed. */
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rep_stosb_threshold = TUNABLE_GET (x86_rep_stosb_threshold,
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long int, NULL);
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+ if (cpu_features->basic.kind == arch_kind_amd
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+ && !TUNABLE_IS_INITIALIZED (x86_rep_stosb_threshold))
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+ /* For AMD Zen3+ architecture, the performance of the vectorized loop is
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+ slightly better than ERMS. */
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+ rep_stosb_threshold = SIZE_MAX;
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TUNABLE_SET_WITH_BOUNDS (x86_data_cache_size, data, 0, SIZE_MAX);
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TUNABLE_SET_WITH_BOUNDS (x86_shared_cache_size, shared, 0, SIZE_MAX);
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