glibc/SOURCES/glibc-upstream-2.34-289.patch

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2022-09-27 14:07:57 +00:00
commit fc54e1fae854e6ee6361cd4ddf900c36fce8158e
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Wed Jun 8 21:16:51 2022 -0700
x86: Align varshift table to 32-bytes
This ensures the load will never split a cache line.
(cherry picked from commit 0f91811333f23b61cf681cab2704b35a0a073b97)
diff --git a/sysdeps/x86_64/multiarch/varshift.c b/sysdeps/x86_64/multiarch/varshift.c
index 45267b0a6823459a..1f563542666bc4f1 100644
--- a/sysdeps/x86_64/multiarch/varshift.c
+++ b/sysdeps/x86_64/multiarch/varshift.c
@@ -16,9 +16,10 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#include "varshift.h"
+#include <stdint.h>
-const int8_t ___m128i_shift_right[31] attribute_hidden =
+const int8_t ___m128i_shift_right[31] attribute_hidden
+ __attribute__((aligned(32))) =
{
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
diff --git a/sysdeps/x86_64/multiarch/varshift.h b/sysdeps/x86_64/multiarch/varshift.h
index 32f2173dd2a95b3a..745d48fa7c775136 100644
--- a/sysdeps/x86_64/multiarch/varshift.h
+++ b/sysdeps/x86_64/multiarch/varshift.h
@@ -19,7 +19,8 @@
#include <stdint.h>
#include <tmmintrin.h>
-extern const int8_t ___m128i_shift_right[31] attribute_hidden;
+extern const int8_t ___m128i_shift_right[31] attribute_hidden
+ __attribute__ ((aligned (32)));
static __inline__ __m128i
__m128i_shift_right (__m128i value, unsigned long int offset)