From 2d08e5dd730680f7f8645a6326ec653435e032df Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Tue, 2 May 2006 23:46:51 -0400
Subject: 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>

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;
-- 
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