From: Ingo Molnar <mingo@elte.hu>
Date: Thu, 28 Apr 2011 10:19:02 +0000 (+0200)
Subject: hashcmp(): inline memcmp() by hand to optimize
X-Git-Tag: v1.7.6-rc0~95^2
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=1a812f3a701969824caf96803e160cbad6050520;p=git.git

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>
---

diff --git a/cache.h b/cache.h
index d478eff1f..57b297c08 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);