From 1281fc99115392eb3f19f5e0a5c9b604fc72b27a Mon Sep 17 00:00:00 2001
From: Richard Biener <rguenther@suse.de>
Date: Thu, 1 Dec 2016 18:18:30 +0000
Subject: vec.h (vec<T, [...]): Guard call to memset if len-oldlen != 0.

2016-12-01  Richard Biener  <rguenther@suse.de>
	    Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

	* vec.h (vec<T, A, vl_embed>::quick_grow_cleared): Guard call to
	memset if len-oldlen != 0.
	(vec<T, va_heap, vl_ptr>::safe_grow_cleared): Likewise.

Co-Authored-By: Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>

From-SVN: r243125
---
 gcc/vec.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'gcc/vec.h')

diff --git a/gcc/vec.h b/gcc/vec.h
index 14fb2a6..aa93411 100644
--- a/gcc/vec.h
+++ b/gcc/vec.h
@@ -1092,8 +1092,10 @@ inline void
 vec<T, A, vl_embed>::quick_grow_cleared (unsigned len)
 {
   unsigned oldlen = length ();
+  size_t sz = sizeof (T) * (len - oldlen);
   quick_grow (len);
-  memset (&(address ()[oldlen]), 0, sizeof (T) * (len - oldlen));
+  if (sz != 0)
+    memset (&(address ()[oldlen]), 0, sz);
 }
 
 
@@ -1605,8 +1607,10 @@ inline void
 vec<T, va_heap, vl_ptr>::safe_grow_cleared (unsigned len MEM_STAT_DECL)
 {
   unsigned oldlen = length ();
+  size_t sz = sizeof (T) * (len - oldlen);
   safe_grow (len PASS_MEM_STAT);
-  memset (&(address ()[oldlen]), 0, sizeof (T) * (len - oldlen));
+  if (sz != 0)
+    memset (&(address ()[oldlen]), 0, sz);
 }
 
 
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