From: Martin Jambor <mjambor@suse.cz>
Date: Thu, 2 Oct 2014 17:13:30 +0000 (+0200)
Subject: re PR rtl-optimization/63375 (reordering of reads across fences)
X-Git-Tag: releases/gcc-4.8.4~192
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b71f29afc82a2648afe5d7b9194bf5de60c70f3c;p=thirdparty%2Fgcc.git

re PR rtl-optimization/63375 (reordering of reads across fences)

2014-10-02  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/63375
	* tree-sra.c (build_access_from_expr_1): Disqualify volatile
	references.

From-SVN: r215807
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 8b5d62943d82..24f6128e43e9 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2014-10-02  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/63375
+	* tree-sra.c (build_access_from_expr_1): Disqualify volatile
+	references.
+
 2014-10-01  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/63342
diff --git a/gcc/tree-sra.c b/gcc/tree-sra.c
index 43b2ce683cbe..644861d7f211 100644
--- a/gcc/tree-sra.c
+++ b/gcc/tree-sra.c
@@ -1030,6 +1030,11 @@ build_access_from_expr_1 (tree expr, gimple stmt, bool write)
 			       "component.");
       return NULL;
     }
+  if (TREE_THIS_VOLATILE (expr))
+    {
+      disqualify_base_of_expr (expr, "part of a volatile reference.");
+      return NULL;
+    }
 
   switch (TREE_CODE (expr))
     {