development/git
development/git
1
0
Fork 0
mirror of https://github.com/git/git synced 2024-08-24 18:26:02 +00:00
Code Issues Packages Projects Releases Wiki Activity

hashcmp(): inline memcmp() by hand to optimize

Browse source 
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>
This commit is contained in:
Ingo Molnar 2011-04-28 12:19:02 +02:00 committed by Junio C Hamano
parent e923eaeb90
commit 1a812f3a70
1 changed files with 15 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
cache.h
View file

@ -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)
{
return !memcmp(sha1, null_sha1, 20);
}
static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
{
return memcmp(sha1, sha2, 20);
int i;
for (i = 0; i < 20; i++, sha1++, sha2++) {
if (*sha1 != *sha2)
return *sha1 - *sha2;
}
return 0;
}
static inline int is_null_sha1(const unsigned char *sha1)
{
return !hashcmp(sha1, null_sha1);
}
static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
{
memcpy(sha_dst, sha_src, 20);