From: Michael Haggerty <mhagger@alum.mit.edu>
Date: Fri, 12 Aug 2011 21:43:10 +0000 (+0200)
Subject: Unroll the loop over passes
X-Git-Tag: v1.7.7-rc1~40^2
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/d68e1c183c056ae583a45b610d086ac078886154?hp=e0a5f9aaae4eea67f513e382d9d917388313d2a6

Unroll the loop over passes

The passes no longer share much code, and the unrolled code is easier
to understand.

Use a new index variable instead of num_attr for the second loop, as
we are no longer counting attributes but rather indexing through them.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

diff --git a/attr.c b/attr.c
index b56542e723..6abaaece32 100644
--- a/attr.c
+++ b/attr.c
@@ -191,10 +191,9 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
 					  int lineno, int macro_ok)
 {
 	int namelen;
-	int num_attr;
+	int num_attr, i;
 	const char *cp, *name, *states;
 	struct match_attr *res = NULL;
-	int pass;
 	int is_macro;
 
 	cp = line + strspn(line, blank);
@@ -226,30 +225,32 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
 	states = name + namelen;
 	states += strspn(states, blank);
 
-	for (pass = 0; pass < 2; pass++) {
-		/* pass 0 counts and allocates, pass 1 fills */
-		for (cp = states, num_attr = 0; *cp; num_attr++) {
-			cp = parse_attr(src, lineno, cp,
-				pass ? &(res->state[num_attr]) : NULL);
-			if (!cp)
-				return NULL;
-		}
-		if (pass)
-			break;
-		res = xcalloc(1,
-			      sizeof(*res) +
-			      sizeof(struct attr_state) * num_attr +
-			      (is_macro ? 0 : namelen + 1));
-		if (is_macro)
-			res->u.attr = git_attr_internal(name, namelen);
-		else {
-			res->u.pattern = (char *)&(res->state[num_attr]);
-			memcpy(res->u.pattern, name, namelen);
-			res->u.pattern[namelen] = 0;
-		}
-		res->is_macro = is_macro;
-		res->num_attr = num_attr;
+	/* First pass to count the attr_states */
+	for (cp = states, num_attr = 0; *cp; num_attr++) {
+		cp = parse_attr(src, lineno, cp, NULL);
+		if (!cp)
+			return NULL;
 	}
+
+	res = xcalloc(1,
+		      sizeof(*res) +
+		      sizeof(struct attr_state) * num_attr +
+		      (is_macro ? 0 : namelen + 1));
+	if (is_macro)
+		res->u.attr = git_attr_internal(name, namelen);
+	else {
+		res->u.pattern = (char *)&(res->state[num_attr]);
+		memcpy(res->u.pattern, name, namelen);
+		res->u.pattern[namelen] = 0;
+	}
+	res->is_macro = is_macro;
+	res->num_attr = num_attr;
+
+	/* Second pass to fill the attr_states */
+	for (cp = states, i = 0; *cp; i++) {
+		cp = parse_attr(src, lineno, cp, &(res->state[i]));
+	}
+
 	return res;
 }