[PATCH] Fix PR52314

[Richard Guenther]

The gimplifier, when forcing a value to a temporary, uses the
type of the value for that temporary variable, making it for
example volatile or const, or puts it in a different address-space
even.  That's odd and not required, we can decay to the main-variant type.

Bootstrapped and tested on x86_64-unknown-linux-gnu, applied to trunk.

Richard.

2012-02-21  Richard Guenther  <rguenther@suse.de>

	PR middle-end/52314
	* gimplify.c (create_tmp_from_val): Use the main variant type
	for the type of the temporary we create.

Index: gcc/gimplify.c
===================================================================
--- gcc/gimplify.c	(revision 184435)
+++ gcc/gimplify.c	(working copy)
@@ -504,7 +504,8 @@ create_tmp_reg (tree type, const char *p
 static inline tree
 create_tmp_from_val (tree val)
 {
-  return create_tmp_var (TREE_TYPE (val), get_name (val));
+  /* Drop all qualifiers and address-space information from the value type.  */
+  return create_tmp_var (TYPE_MAIN_VARIANT (TREE_TYPE (val)), get_name (val));
 }
 
 /* Create a temporary to hold the value of VAL.  If IS_FORMAL, try to reuse