x86: Align varshift table to 32-bytes

This ensures the load will never split a cache line.

diff --git a/sysdeps/x86_64/multiarch/varshift.c b/sysdeps/x86_64/multiarch/varshift.c
index c8210f0546c87e0442361db300001cdb617fa0dc..d27767520aafbf75fc2c17b34605f82ae099bef7 100644 (file)
--- 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 af306944887af7401686404d28b31fb4aba40a07..ffd12d79e42fcdc9d1db8094550fb58558ad09cc 100644 (file)
--- 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)