From: Martin Liska <mliska@suse.cz>
Date: Tue, 19 Dec 2017 13:20:07 +0000 (+0100)
Subject: Fix off by one error in loop-unroll.c (PR rtl-optimization/82675).
X-Git-Tag: basepoints/gcc-9~2572
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f389e7983bc89fb3d6041d676de7e313892d5ede;p=thirdparty%2Fgcc.git

Fix off by one error in loop-unroll.c (PR rtl-optimization/82675).

2017-12-19  Martin Liska  <mliska@suse.cz>

	PR rtl-optimization/82675
	* loop-unroll.c (unroll_loop_constant_iterations): Allocate one
	more element in sbitmap.

From-SVN: r255818
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 75c9a222f9f7..63b2ff5406fd 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-12-19  Martin Liska  <mliska@suse.cz>
+
+	PR rtl-optimization/82675
+	* loop-unroll.c (unroll_loop_constant_iterations): Allocate one
+	more element in sbitmap.
+
 2017-12-19  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* gimplify.c (gimplify_expr): Use error_operand_p.
diff --git a/gcc/loop-unroll.c b/gcc/loop-unroll.c
index cc154da9686a..b9d01ffe0664 100644
--- a/gcc/loop-unroll.c
+++ b/gcc/loop-unroll.c
@@ -498,7 +498,7 @@ unroll_loop_constant_iterations (struct loop *loop)
 
   exit_mod = niter % (max_unroll + 1);
 
-  auto_sbitmap wont_exit (max_unroll + 1);
+  auto_sbitmap wont_exit (max_unroll + 2);
   bitmap_ones (wont_exit);
 
   auto_vec<edge> remove_edges;