This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
[PATCH] Performance fix for libmpx memmove wrapper
- From: Aleksandra Tsvetkova <astsvetk at gmail dot com>
- To: gcc-patches <gcc-patches at gcc dot gnu dot org>
- Date: Thu, 24 Dec 2015 14:21:43 +0300
- Subject: [PATCH] Performance fix for libmpx memmove wrapper
- Authentication-results: sourceware.org; auth=none
This patch was tested on spec2000, spec2006 and make check. It fixes
regression on vortex.
2015-12-11 Tsvetkova Alexandra <aleksandra.tsvetkova@intel.com>
* libmpxwrap/mpx_wrappers.c (mpx_pointer): New type.
diff --git a/libmpx/mpxwrap/mpx_wrappers.c b/libmpx/mpxwrap/mpx_wrappers.c
old mode 100644
new mode 100755
index ffa7e7e..679e546
--- a/libmpx/mpxwrap/mpx_wrappers.c
+++ b/libmpx/mpxwrap/mpx_wrappers.c
@@ -483,10 +483,20 @@ __mpx_wrapper_memmove (void *dst, const void
*src, size_t n)
__bnd_chk_ptr_bounds (dst, n);
__bnd_chk_ptr_bounds (src, n);
+ /* This is an speedup for size of pointer. */
+ if (n == sizeof (void *))
+ {
+ const void **s = (const void**)src;
+ void **d = (void**)dst;
+ *d = *s;
+ return dst;
+ }
+
memmove (dst, src, n);
+
/* Not necessary to copy bounds if size is less then size of pointer
or SRC==DST. */
- if ((n >= sizeof (void *)) && (src != dst))
+ if ((n > sizeof (void *)) && (src != dst))
move_bounds (dst, src, n);
return dst;