re PR tree-optimization/55920 (ICE in expand_debug_locations, at cfgexpand.c:3753)

	PR tree-optimization/55920
	* tree-sra.c (sra_modify_assign): If for lacc->grp_to_be_debug_replaced
	there is non-useless type conversion needed from debug rhs to lhs,
	use build_debug_ref_for_model and/or VIEW_CONVERT_EXPR.

	* gcc.c-torture/compile/pr55920.c: New test.

From-SVN: r195209

gcc/ChangeLog

+2013-01-15  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/55920
+	* tree-sra.c (sra_modify_assign): If for lacc->grp_to_be_debug_replaced
+	there is non-useless type conversion needed from debug rhs to lhs,
+	use build_debug_ref_for_model and/or VIEW_CONVERT_EXPR.
+
 2013-01-15  Joseph Myers  <joseph@codesourcery.com>
 	    Mikael Pettersson  <mikpe@it.uu.se>
 

gcc/testsuite/ChangeLog

+2013-01-15  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/55920
+	* gcc.c-torture/compile/pr55920.c: New test.
+
 2013-01-15  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/55882

gcc/testsuite/gcc.c-torture/compile/pr55920.c

+/* PR tree-optimization/55920 */
+
+struct A { unsigned a; } __attribute__((packed));
+struct B { int b; unsigned char c[16]; };
+void bar (struct A);
+
+void
+foo (struct B *x)
+{
+  struct A a;
+  if (x->b)
+    __builtin_memcpy (&a, x->c, sizeof a);
+  else
+    a.a = 0;
+  bar (a);
+}

gcc/tree-sra.c

@@ -3108,8 +3108,20 @@ sra_modify_assign (gimple *stmt, gimple_stmt_iterator *gsi)
 
   if (lacc && lacc->grp_to_be_debug_replaced)
     {
-      gimple ds = gimple_build_debug_bind (get_access_replacement (lacc),
-					   unshare_expr (rhs), *stmt);
+      tree dlhs = get_access_replacement (lacc);
+      tree drhs = unshare_expr (rhs);
+      if (!useless_type_conversion_p (TREE_TYPE (dlhs), TREE_TYPE (drhs)))
+	{
+	  if (AGGREGATE_TYPE_P (TREE_TYPE (drhs))
+	      && !contains_vce_or_bfcref_p (drhs))
+	    drhs = build_debug_ref_for_model (loc, drhs, 0, lacc);
+	  if (drhs
+	      && !useless_type_conversion_p (TREE_TYPE (dlhs),
+					     TREE_TYPE (drhs)))
+	    drhs = fold_build1_loc (loc, VIEW_CONVERT_EXPR,
+				    TREE_TYPE (dlhs), drhs);
+	}
+      gimple ds = gimple_build_debug_bind (dlhs, drhs, *stmt);
       gsi_insert_before (gsi, ds, GSI_SAME_STMT);
     }