From a9b39de805384725f09b3b80c928bdf8aeca8d1f Mon Sep 17 00:00:00 2001
From: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 13 Jan 2010 13:31:13 +0000
Subject: 2010-01-13  Richard Guenther  <rguenther@suse.de>

	PR middle-end/42716
	* fold-const.c (fold_unary_loc): Fold INDIRECT_REFs.

	* gcc.c-torture/compile/pr42716.c: New testcase.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@155859 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/fold-const.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'gcc/fold-const.c')

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index e1126219689..9e40296123c 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -8942,6 +8942,19 @@ fold_unary_loc (location_t loc, enum tree_code code, tree type, tree op0)
 	}
       return NULL_TREE;
 
+    case INDIRECT_REF:
+      /* Fold *&X to X if X is an lvalue.  */
+      if (TREE_CODE (op0) == ADDR_EXPR)
+	{
+	  tree op00 = TREE_OPERAND (op0, 0);
+	  if ((TREE_CODE (op00) == VAR_DECL
+	       || TREE_CODE (op00) == PARM_DECL
+	       || TREE_CODE (op00) == RESULT_DECL)
+	      && !TREE_READONLY (op00))
+	    return op00;
+	}
+      return NULL_TREE;
+
     default:
       return NULL_TREE;
     } /* switch (code) */
-- 
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