xdiff/xmerge.c: use memset() instead of explicit for-loop

memset() is heavily optimized, and resulting assembler code
is about 150 lines less for that file.

Signed-off-by: Alexey Mahotkin <squadette@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/xdiff/xmerge.c b/xdiff/xmerge.c
index 16dd9acd37b431f1e439d9ab051fe2436c54b45c..6d6fc1bc5e01be7305ec5101f43645a1dce69bd3 100644 (file)
--- a/xdiff/xmerge.c
+++ b/xdiff/xmerge.c
@@ -152,7 +152,6 @@ static int fill_conflict_hunk(xdfenv_t *xe1, const char *name1,
        int marker1_size = (name1 ? strlen(name1) + 1 : 0);
        int marker2_size = (name2 ? strlen(name2) + 1 : 0);
        int marker3_size = (name3 ? strlen(name3) + 1 : 0);
-       int j;
 
        if (marker_size <= 0)
                marker_size = DEFAULT_CONFLICT_MARKER_SIZE;
@@ -164,8 +163,8 @@ static int fill_conflict_hunk(xdfenv_t *xe1, const char *name1,
        if (!dest) {
                size += marker_size + 1 + marker1_size;
        } else {
-               for (j = 0; j < marker_size; j++)
-                       dest[size++] = '<';
+               memset(dest + size, '<', marker_size);
+               size += marker_size;
                if (marker1_size) {
                        dest[size] = ' ';
                        memcpy(dest + size + 1, name1, marker1_size - 1);
@@ -183,8 +182,8 @@ static int fill_conflict_hunk(xdfenv_t *xe1, const char *name1,
                if (!dest) {
                        size += marker_size + 1 + marker3_size;
                } else {
-                       for (j = 0; j < marker_size; j++)
-                               dest[size++] = '|';
+                       memset(dest + size, '|', marker_size);
+                       size += marker_size;
                        if (marker3_size) {
                                dest[size] = ' ';
                                memcpy(dest + size + 1, name3, marker3_size - 1);
@@ -199,8 +198,8 @@ static int fill_conflict_hunk(xdfenv_t *xe1, const char *name1,
        if (!dest) {
                size += marker_size + 1;
        } else {
-               for (j = 0; j < marker_size; j++)
-                       dest[size++] = '=';
+               memset(dest + size, '=', marker_size);
+               size += marker_size;
                dest[size++] = '\n';
        }
 
@@ -210,8 +209,8 @@ static int fill_conflict_hunk(xdfenv_t *xe1, const char *name1,
        if (!dest) {
                size += marker_size + 1 + marker2_size;
        } else {
-               for (j = 0; j < marker_size; j++)
-                       dest[size++] = '>';
+               memset(dest + size, '>', marker_size);
+               size += marker_size;
                if (marker2_size) {
                        dest[size] = ' ';
                        memcpy(dest + size + 1, name2, marker2_size - 1);