com php-src: Second prefetch is useless, because cahce line on modern x86 CPUs is 64 bytes long.: ext/opcache/zend_accelerator_util _funcs.c
| From: | Dmitry Stogov | Date: | Wed, 18 Mar 2015 14:11:21 +0000 |
| Subject: | com php-src: Second prefetch is useless, because cahce line on modern x86 CPUs is 64 bytes long.: ext/opcache/zend_accelerator_util _funcs.c | ||
| Groups: | php.cvs | ||
| Request: | Send a blank email to php-cvs+get-85624@lists.php.net to get a copy of this message | ||
Commit: d092cb6e8ec9afc9c0433fcc42df57d3aa621f02
Author: Dmitry Stogov <dmitry@zend.com> Wed, 18 Mar 2015 17:11:21 +0300
Parents: 5c6db3b0f2a8fdc1ad5221abc9450d0599fc5ece
Branches: master
Link: http://git.php.net/?p=php-src.git;a=commitdiff;h=d092cb6e8ec9afc9c0433fcc42df57d3aa621f02
Log:
Second prefetch is useless, because cahce line on modern x86 CPUs is 64 bytes long.
Changed paths:
M ext/opcache/zend_accelerator_util_funcs.c
Diff:
diff --git a/ext/opcache/zend_accelerator_util_funcs.c b/ext/opcache/zend_accelerator_util_funcs.c
index 8b301bf..20b097b 100644
--- a/ext/opcache/zend_accelerator_util_funcs.c
+++ b/ext/opcache/zend_accelerator_util_funcs.c
@@ -770,7 +770,6 @@ static zend_always_inline void fast_memcpy(void *dest, const void *src, size_t s
do {
_mm_prefetch(dqsrc + 4, _MM_HINT_NTA);
- _mm_prefetch(dqsrc + 6, _MM_HINT_NTA);
__m128i xmm0 = _mm_load_si128(dqsrc + 0);
__m128i xmm1 = _mm_load_si128(dqsrc + 1);