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| author | Nicolas Pitre <nico@cam.org> | 2006-05-03 03:46:51 (GMT) |
|---|---|---|
| committer | Junio C Hamano <junkio@cox.net> | 2006-05-03 04:32:32 (GMT) |
| commit | 2d08e5dd730680f7f8645a6326ec653435e032df (patch) | |
| tree | c7ef4bbad6607e767d60b3670c772aee8f056605 /diff-delta.c | |
| parent | 3dc5a9e4cdcc7124c665a050547d1285d86a421f (diff) | |
| download | git-2d08e5dd730680f7f8645a6326ec653435e032df.zip git-2d08e5dd730680f7f8645a6326ec653435e032df.tar.gz git-2d08e5dd730680f7f8645a6326ec653435e032df.tar.bz2 | |
tiny optimization to diff-delta
This is my assembly freak side looking at generated code again. And
since create_delta() is certainly pretty high on the radar every bits
count. In this case shorter code is generated if hash_mask is not
copied to a local variable.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
Diffstat (limited to 'diff-delta.c')
| -rw-r--r-- | diff-delta.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/diff-delta.c b/diff-delta.c index 35e517d..45df786 100644 --- a/diff-delta.c +++ b/diff-delta.c @@ -239,7 +239,7 @@ create_delta(const struct delta_index *index, const void *trg_buf, unsigned long trg_size, unsigned long *delta_size, unsigned long max_size) { - unsigned int i, outpos, outsize, hash_mask, val; + unsigned int i, outpos, outsize, val; int inscnt; const unsigned char *ref_data, *ref_top, *data, *top; unsigned char *out; @@ -275,7 +275,6 @@ create_delta(const struct delta_index *index, ref_top = ref_data + index->src_size; data = trg_buf; top = trg_buf + trg_size; - hash_mask = index->hash_mask; outpos++; val = 0; @@ -290,7 +289,7 @@ create_delta(const struct delta_index *index, struct index_entry *entry; val ^= U[data[-RABIN_WINDOW]]; val = ((val << 8) | *data) ^ T[val >> RABIN_SHIFT]; - i = val & hash_mask; + i = val & index->hash_mask; for (entry = index->hash[i]; entry; entry = entry->next) { const unsigned char *ref = entry->ptr; const unsigned char *src = data; |