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authorSubbaiah Venkata <kvsnaidu@sapnaidu.net>2007-10-16 23:27:06 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 08:42:52 -0700
commit995e4286a047b32aebf8ce540908edb7fbd93f76 (patch)
tree9c8e89d7dd7b33908ce7925df1bf7f67cade01db /lib/sort.c
parente30618cbd1919df61b3f17486af44ac78c24cae5 (diff)
downloadlinux-sh-995e4286a047b32aebf8ce540908edb7fbd93f76.tar.gz
lib/sort.c optimization
Hello, I fixed and tested a small bug in lib/sort.c file, heap sort function. The fix avoids unnecessary swap of contents when i is 0 (saves few loads and stores), which happens every time sort function is called. I felt the fix is worth bringing it to your attention given the importance and frequent use of the sort function. Acked-by: Matt Mackall <mpm@selenic.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/sort.c')
-rw-r--r--lib/sort.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sort.c b/lib/sort.c
index 961567894d16..6abbaf3d5858 100644
--- a/lib/sort.c
+++ b/lib/sort.c
@@ -67,7 +67,7 @@ void sort(void *base, size_t num, size_t size,
}
/* sort */
- for (i = n - size; i >= 0; i -= size) {
+ for (i = n - size; i > 0; i -= size) {
swap(base, base + i, size);
for (r = 0; r * 2 + size < i; r = c) {
c = r * 2 + size;