From 263e77cbb2185c86c9604558f0cd126873f51676 Mon Sep 17 00:00:00 2001
From: Arnaud Giersch <arnaud.giersch@iut-bm.univ-fcomte.fr>
Date: Wed, 23 Nov 2011 15:54:14 +0100
Subject: [PATCH] Avoid to clear mem for the last element.

And save a few calls to memset.
---
 src/xbt/dynar.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/xbt/dynar.c b/src/xbt/dynar.c
index 85687a2e59..3de29e1230 100644
--- a/src/xbt/dynar.c
+++ b/src/xbt/dynar.c
@@ -360,8 +360,10 @@ static XBT_INLINE void *_xbt_dynar_set_at_ptr(const xbt_dynar_t dynar,
 
   if (idx >= dynar->used) {
     _xbt_dynar_expand(dynar, idx + 1);
-    memset(((char * const)dynar->data) + dynar->used * dynar->elmsize, 0,
-           (idx + 1 - dynar->used)*dynar->elmsize);
+    if (idx > dynar->used) {
+      memset(_xbt_dynar_elm(dynar, dynar->used), 0,
+             (idx - dynar->used) * dynar->elmsize);
+    }
     dynar->used = idx + 1;
   }
   return _xbt_dynar_elm(dynar, idx);
-- 
2.20.1