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authorIngo Molnar <mingo@elte.hu>2011-04-28 10:19:02 (GMT)
committerJunio C Hamano <gitster@pobox.com>2011-04-28 20:18:30 (GMT)
commit1a812f3a701969824caf96803e160cbad6050520 (patch)
tree8cb85f640c68e9e91cacb1e4cb67e009df66ef61 /cache.h
parente923eaeb901ff056421b9007adcbbce271caa7b6 (diff)
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hashcmp(): inline memcmp() by hand to optimize
This is reported to speed "git gc" by 18%. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'cache.h')
-rw-r--r--cache.h18
1 files changed, 14 insertions, 4 deletions
diff --git a/cache.h b/cache.h
index d478eff..57b297c 100644
--- a/cache.h
+++ b/cache.h
@@ -614,14 +614,24 @@ extern char *sha1_pack_name(const unsigned char *sha1);
extern char *sha1_pack_index_name(const unsigned char *sha1);
extern const char *find_unique_abbrev(const unsigned char *sha1, int);
extern const unsigned char null_sha1[20];
-static inline int is_null_sha1(const unsigned char *sha1)
+
+static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
{
- return !memcmp(sha1, null_sha1, 20);
+ int i;
+
+ for (i = 0; i < 20; i++, sha1++, sha2++) {
+ if (*sha1 != *sha2)
+ return *sha1 - *sha2;
+ }
+
+ return 0;
}
-static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
+
+static inline int is_null_sha1(const unsigned char *sha1)
{
- return memcmp(sha1, sha2, 20);
+ return !hashcmp(sha1, null_sha1);
}
+
static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
{
memcpy(sha_dst, sha_src, 20);