forked from rpms/glibc
42 lines
1.5 KiB
Diff
42 lines
1.5 KiB
Diff
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commit fc54e1fae854e6ee6361cd4ddf900c36fce8158e
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Author: Noah Goldstein <goldstein.w.n@gmail.com>
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Date: Wed Jun 8 21:16:51 2022 -0700
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x86: Align varshift table to 32-bytes
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This ensures the load will never split a cache line.
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(cherry picked from commit 0f91811333f23b61cf681cab2704b35a0a073b97)
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diff --git a/sysdeps/x86_64/multiarch/varshift.c b/sysdeps/x86_64/multiarch/varshift.c
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index 45267b0a6823459a..1f563542666bc4f1 100644
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--- a/sysdeps/x86_64/multiarch/varshift.c
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+++ b/sysdeps/x86_64/multiarch/varshift.c
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@@ -16,9 +16,10 @@
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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-#include "varshift.h"
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+#include <stdint.h>
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-const int8_t ___m128i_shift_right[31] attribute_hidden =
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+const int8_t ___m128i_shift_right[31] attribute_hidden
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+ __attribute__((aligned(32))) =
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{
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
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diff --git a/sysdeps/x86_64/multiarch/varshift.h b/sysdeps/x86_64/multiarch/varshift.h
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index 32f2173dd2a95b3a..745d48fa7c775136 100644
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--- a/sysdeps/x86_64/multiarch/varshift.h
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+++ b/sysdeps/x86_64/multiarch/varshift.h
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@@ -19,7 +19,8 @@
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#include <stdint.h>
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#include <tmmintrin.h>
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-extern const int8_t ___m128i_shift_right[31] attribute_hidden;
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+extern const int8_t ___m128i_shift_right[31] attribute_hidden
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+ __attribute__ ((aligned (32)));
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static __inline__ __m128i
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__m128i_shift_right (__m128i value, unsigned long int offset)
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