From: Richard Biener <rguenther@suse.de>
Date: Fri, 29 Nov 2013 10:47:52 +0000 (+0000)
Subject: re PR tree-optimization/59334 (r205486 caused many failures)
X-Git-Tag: releases/gcc-4.9.0~2375
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b54fc5b7ee19a2410460a2424a4fb8754a7467cb;p=thirdparty%2Fgcc.git

re PR tree-optimization/59334 (r205486 caused many failures)

2013-11-29  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/59334
	* tree-ssa-dce.c (eliminate_unnecessary_stmts): Fix bug
	in previous commit.

From-SVN: r205515
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 035ab85fef4d..fdd9485adcb6 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2013-11-29  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/59334
+	* tree-ssa-dce.c (eliminate_unnecessary_stmts): Fix bug
+	in previous commit.
+
 2013-11-29  Jakub Jelinek  <jakub@redhat.com>
 	    Richard Biener  <rguenther@suse.de>
 
diff --git a/gcc/tree-ssa-dce.c b/gcc/tree-ssa-dce.c
index e2177fed99c6..8fc6fce3ec28 100644
--- a/gcc/tree-ssa-dce.c
+++ b/gcc/tree-ssa-dce.c
@@ -1200,7 +1200,8 @@ eliminate_unnecessary_stmts (void)
 	      if (TREE_CODE (ptr) == SSA_NAME)
 		{
 		  gimple def_stmt = SSA_NAME_DEF_STMT (ptr);
-		  if (!gimple_plf (def_stmt, STMT_NECESSARY))
+		  if (!gimple_nop_p (def_stmt)
+		      && !gimple_plf (def_stmt, STMT_NECESSARY))
 		    gimple_set_plf (stmt, STMT_NECESSARY, false);
 		}
 	    }