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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.

(cherry picked from commit 0f91811333)
This commit is contained in:
Noah Goldstein 2022-06-08 21:16:51 -07:00 committed by Sunil K Pandey
parent 820504e3ed
commit fc54e1fae8
2 changed files with 5 additions and 3 deletions
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5
sysdeps/x86_64/multiarch/varshift.c
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@ -16,9 +16,10 @@
License along with the GNU C Library; if not, see License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */ <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, 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 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1

3
sysdeps/x86_64/multiarch/varshift.h
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@ -19,7 +19,8 @@
#include <stdint.h> #include <stdint.h>
#include <tmmintrin.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 static __inline__ __m128i
__m128i_shift_right (__m128i value, unsigned long int offset) __m128i_shift_right (__m128i value, unsigned long int offset)