From 0f91811333f23b61cf681cab2704b35a0a073b97 Mon Sep 17 00:00:00 2001
From: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Wed, 8 Jun 2022 21:16:51 -0700
Subject: x86: Align varshift table to 32-bytes

This ensures the load will never split a cache line.
---
 sysdeps/x86_64/multiarch/varshift.c | 5 +++--
 sysdeps/x86_64/multiarch/varshift.h | 3 ++-
 2 files changed, 5 insertions(+), 3 deletions(-)

(limited to 'sysdeps/x86_64/multiarch')

diff --git a/sysdeps/x86_64/multiarch/varshift.c b/sysdeps/x86_64/multiarch/varshift.c
index c8210f0546..d27767520a 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 af30694488..ffd12d79e4 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)
-- 
cgit 1.4.1