re PR tree-optimization/48694 (possible memory hog bug)

2011-04-26  Richard Guenther  <rguenther@suse.de>

	PR middle-end/48694
	* tree.h (OEP_CONSTANT_ADDRESS_OF): New operand_equal_flag.
	* fold-const.c (operand_equal_p): For TREE_CONSTANT ADDR_EXPRs
	compare the operands with OEP_CONSTANT_ADDRESS_OF.  Treat
	trees with TREE_SIDE_EFFECTS equal when OEP_CONSTANT_ADDRESS_OF
	is set.

	* gcc.dg/torture/pr48694-1.c: New testcase.
	* gcc.dg/torture/pr48694-2.c: Likewise.

From-SVN: r172957

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 69132f4bf05c594a04b39df785e561df631727ec..43c6b23f3bdb5a05f6cb448185a3a42b042cb936 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,17 @@
+2011-04-26  Richard Guenther  <rguenther@suse.de>
+
+       * c-typeck.c (build_unary_op): Do not expand array-refs via
+       pointer arithmetic.  Only adjust qualifiers for function types.
+
+2011-04-26  Richard Guenther  <rguenther@suse.de>
+
+       PR middle-end/48694
+       * tree.h (OEP_CONSTANT_ADDRESS_OF): New operand_equal_flag.
+       * fold-const.c (operand_equal_p): For TREE_CONSTANT ADDR_EXPRs
+       compare the operands with OEP_CONSTANT_ADDRESS_OF.  Treat
+       trees with TREE_SIDE_EFFECTS equal when OEP_CONSTANT_ADDRESS_OF
+       is set.
+
 2011-04-25  Paolo Carlini  <paolo.carlini@oracle.com>
 
        * c-family/c-common.c (struct c_common_resword): Add