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authorH.J. Lu <hongjiu.lu@intel.com>2010-04-14 17:53:44 -0700
committerUlrich Drepper <drepper@redhat.com>2010-04-14 17:53:44 -0700
commitdd37cd1a1243fad34d67ea54ebc36fc412da6e88 (patch)
treebb57682d6e1fe7f93f289df1cf206a29433c1224 /malloc
parent404a6e32012cfef041709639e13d200ae0b2c0c6 (diff)
downloadglibc-dd37cd1a1243fad34d67ea54ebc36fc412da6e88.tar.gz
Optimie x86-64 SSE4 memcmp for unaligned data.
Diffstat (limited to 'malloc')
-rw-r--r--malloc/malloc.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 722b1d4961..b067b65bdc 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -3168,6 +3168,10 @@ static Void_t* sYSMALLOc(nb, av) INTERNAL_SIZE_T nb; mstate av;
size = nb + mp_.top_pad + MINSIZE;
+#define TWOM (2*1024*1024)
+ char *cur = (char*)MORECORE(0);
+ size = (char*)((size_t)(cur + size + TWOM - 1)&~(TWOM-1))-cur;
+
/*
If contiguous, we can subtract out existing space that we hope to
combine with new space. We add it back later only if