From: Kyrylo Tkachov <kyrylo.tkachov@arm.com>
Date: Tue, 8 Nov 2016 12:31:31 +0000 (+0000)
Subject: [1/2] Fix off-by-one error in clear_bit_region in store merging (PR tree-optimization... 
X-Git-Tag: basepoints/gcc-8~3307
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1f069ef5a1899e119979b755c6627bb19176a4f0;p=thirdparty%2Fgcc.git

[1/2] Fix off-by-one error in clear_bit_region in store merging (PR tree-optimization/78234 ?)

	PR tree-optimization/78234
	* gimple-ssa-store-merging.c (clear_bit_region): Fix off-by-one error
	in start != 0 case.

From-SVN: r241962
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f06b68e856d6..b4169edded38 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2016-11-08  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	PR tree-optimization/78234
+	* gimple-ssa-store-merging.c (clear_bit_region): Fix off-by-one error
+	in start != 0 case.
+
 2016-11-08  Martin Liska  <mliska@suse.cz>
 
 	PR testsuite/78242
diff --git a/gcc/gimple-ssa-store-merging.c b/gcc/gimple-ssa-store-merging.c
index 57b855671dbb..727ed9fb6a24 100644
--- a/gcc/gimple-ssa-store-merging.c
+++ b/gcc/gimple-ssa-store-merging.c
@@ -337,7 +337,7 @@ clear_bit_region (unsigned char *ptr, unsigned int start,
   else if (start != 0)
     {
       clear_bit_region (ptr, start, BITS_PER_UNIT - start);
-      clear_bit_region (ptr + 1, 0, len - (BITS_PER_UNIT - start) + 1);
+      clear_bit_region (ptr + 1, 0, len - (BITS_PER_UNIT - start));
     }
   /* Whole bytes need to be cleared.  */
   else if (start == 0 && len > BITS_PER_UNIT)