From 3fa39831668c00d32632f72860cbacbcf8bef1cb Mon Sep 17 00:00:00 2001
From: Richard Guenther <rguenther@suse.de>
Date: Fri, 2 Jul 2010 09:14:03 +0000
Subject: [PATCH] re PR tree-optimization/44748 (ICE: in
 fold_convert_const_int_from_real, at fold-const.c:1548)

2010-07-02  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/44748
	* tree-ssa-ccp.c (fold_const_aggregate_ref): Properly handle
	the embedded conversion in MEM_REFs.

	* gcc.dg/tree-ssa/ssa-ccp-29.c: New testcase.

From-SVN: r161689
---
 gcc/ChangeLog                              |  6 ++++++
 gcc/testsuite/ChangeLog                    |  5 +++++
 gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-29.c | 11 +++++++++++
 gcc/tree-ssa-ccp.c                         |  9 ++++++++-
 4 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-29.c

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 40522695b583..365a719ed81d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2010-07-02  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/44748
+	* tree-ssa-ccp.c (fold_const_aggregate_ref): Properly handle
+	the embedded conversion in MEM_REFs.
+
 2010-07-01  López-Ibáñez  <manu@gcc.gnu.org>
 
 	* reload.c: Include toplev.h.
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 8d84acde1807..d9c0a99a7bd0 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2010-07-02  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/44748
+	* gcc.dg/tree-ssa/ssa-ccp-29.c: New testcase.
+
 2010-07-02  Iain Sandoe  <iains@gcc.gnu.org>
 
 	* objc-obj-c++-shared/next-abi.h: Remove dependency on system
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-29.c b/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-29.c
new file mode 100644
index 000000000000..44d2945a311f
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/ssa-ccp-29.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-ccp2" } */
+
+static double num;
+int foo (void)
+{
+  return *(unsigned *)&num;
+}
+
+/* { dg-final { scan-tree-dump "return 0;" "ccp2" } } */
+/* { dg-final { cleanup-tree-dump "ccp2" } } */
diff --git a/gcc/tree-ssa-ccp.c b/gcc/tree-ssa-ccp.c
index 912c5059363a..1e2309acb167 100644
--- a/gcc/tree-ssa-ccp.c
+++ b/gcc/tree-ssa-ccp.c
@@ -1317,7 +1317,14 @@ fold_const_aggregate_ref (tree t)
 	  if (DECL_P (base)
 	      && !AGGREGATE_TYPE_P (TREE_TYPE (base))
 	      && integer_zerop (TREE_OPERAND (t, 1)))
-	    return get_symbol_constant_value (base);
+	    {
+	      tree res = get_symbol_constant_value (base);
+	      if (res
+		  && !useless_type_conversion_p
+		        (TREE_TYPE (t), TREE_TYPE (res)))
+		res = fold_unary (VIEW_CONVERT_EXPR, TREE_TYPE (t), res);
+	      return res;
+	    }
 
 	  if (!TREE_READONLY (base)
 	      || TREE_CODE (TREE_TYPE (base)) != ARRAY_TYPE
-- 
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