Fix PR 44955: Strip off the real and complex parts.

2010-07-21  Changpeng Fang  <changpeng.fang@amd.com>

	PR tree-optimization/44955
	* tree-ssa-loop-prefetch.c (analyze_ref): Strip off the real
	and imagine parts of a complex, so that they can have the same
	base and fall into the same group.

From-SVN: r162381

gcc/ChangeLog

+2010-07-21  Changpeng Fang  <changpeng.fang@amd.com>
+
+	* tree-ssa-loop-prefetch.c (analyze_ref): Strip off the real
+	and imagine parts of a complex, so that they can have the same
+	base and fall into the same group.
+
 2010-07-21  Richard Guenther  <rguenther@suse.de>
 
 	PR lto/45018

gcc/tree-ssa-loop-prefetch.c

@@ -486,10 +486,18 @@ analyze_ref (struct loop *loop, tree *ref_p, tree *base,
   *step = NULL_TREE;
   *delta = 0;
 
-  /* First strip off the component references.  Ignore bitfields.  */
-  if (TREE_CODE (ref) == COMPONENT_REF
-      && DECL_NONADDRESSABLE_P (TREE_OPERAND (ref, 1)))
-    ref = TREE_OPERAND (ref, 0);
+  /* First strip off the component references.  Ignore bitfields.
+     Also strip off the real and imagine parts of a complex, so that
+     they can have the same base.  */
+  if (TREE_CODE (ref) == REALPART_EXPR
+      || TREE_CODE (ref) == IMAGPART_EXPR
+      || (TREE_CODE (ref) == COMPONENT_REF
+          && DECL_NONADDRESSABLE_P (TREE_OPERAND (ref, 1))))
+    {
+      if (TREE_CODE (ref) == IMAGPART_EXPR)
+        *delta += int_size_in_bytes (TREE_TYPE (ref));
+      ref = TREE_OPERAND (ref, 0);
+    }
 
   *ref_p = ref;