Don't bother merging when there are no pending elements

1 files changed, 6 insertions, 3 deletions

diff --git a/wikisort.c b/wikisort.c
index b2de063..4d69582 100644
--- a/wikisort.c
+++ b/wikisort.c
@@ -204,15 +204,18 @@ void wikisort(void *unsorted, size_t nmel, size_t width, cmpfun cmp)
 
 			/* merge any previous pending as and bs */
 			nmel_pend_b -= offset;
-			if (nmel_pend_a) {
+			if (nmel_pend_a && nmel_pend_b) {
 				merge_blocks(base, penda, nmel_pend_a, nmel_pend_b, width, cmp);
 			}
+
+			nmel_pend_a = bnmel;
+			nmel_pend_b = offset;
 		} else {
+			nmel_pend_a = 0;
+			nmel_pend_b = 0;
 			offset = 0;
 		}
 
-		nmel_pend_a = bnmel;
-		nmel_pend_b = offset;
 		penda = a.base - offset * width;
 		a.base += bwidth;
 		if (--a.blocks) {