From: Martin Jambor <mjambor@suse.cz>
Date: Thu, 2 Oct 2014 16:49:14 +0000 (+0200)
Subject: re PR rtl-optimization/63375 (reordering of reads across fences)
X-Git-Tag: releases/gcc-5.1.0~4326
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=252c1a465c2b12af14649a30fdf73fbd5d24b66d;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: r215804
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6546ff138e28..e330d18ae4b4 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.
+
 2014-10-02  Olivier Hainque  <hainque@adacore.com>
 
 	* Makefile.in (CROSS): Define, to @CROSS.
diff --git a/gcc/tree-sra.c b/gcc/tree-sra.c
index 8259dbaa316d..fb24114fa6b7 100644
--- a/gcc/tree-sra.c
+++ b/gcc/tree-sra.c
@@ -1064,6 +1064,11 @@ 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))
     {