re PR tree-optimization/47228 (wrong code with loop)

2011-01-27  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/47228
	* tree-sra.c (sra_modify_assign): Use build_ref_for_model instead of
	build_ref_for_offset.

	* testsuite/gcc.dg/torture/pr47228.c: New test.

From-SVN: r169331

gcc/ChangeLog

+2011-01-27  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/47228
+	* tree-sra.c (sra_modify_assign): Use build_ref_for_model instead of
+	build_ref_for_offset.
+
 2011-01-27  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
 
 	* config/spu/spu-elf.h (ASM_SPEC): Remove.

gcc/testsuite/ChangeLog

+2011-01-27  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/47228
+	* gcc.dg/torture/pr47228.c: New test.
+
 2011-01-27  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
 
 	* gcc.dg/tree-ssa/pr42585.c: Disable on s390 and s390x.

gcc/testsuite/gcc.dg/torture/pr47228.c

+/* { dg-do run } */
+
+struct S4
+{
+  unsigned f0:24;
+} __attribute__((__packed__));
+
+struct S4 g_10 = {
+  6210831
+};
+
+struct S4 func_2 (int x)
+{
+  struct S4 l_8[2] = {
+    {0}, {0}
+  };
+  g_10 = l_8[1];
+  for (; x<2; x++) {
+    struct S4 tmp = {
+      11936567
+    };
+    l_8[x] = tmp;
+  }
+  return g_10;
+}
+
+int main (void)
+{
+  func_2 (0);
+  return 0;
+}

gcc/tree-sra.c

@@ -2739,15 +2739,13 @@ sra_modify_assign (gimple *stmt, gimple_stmt_iterator *gsi)
 	      && !contains_bitfld_comp_ref_p (lhs)
 	      && !access_has_children_p (lacc))
 	    {
-	      lhs = build_ref_for_offset (loc, lhs, 0, TREE_TYPE (rhs),
-					  gsi, false);
+	      lhs = build_ref_for_model (loc, lhs, 0, racc, gsi, false);
 	      gimple_assign_set_lhs (*stmt, lhs);
 	    }
 	  else if (AGGREGATE_TYPE_P (TREE_TYPE (rhs))
 		   && !contains_vce_or_bfcref_p (rhs)
 		   && !access_has_children_p (racc))
-	    rhs = build_ref_for_offset (loc, rhs, 0, TREE_TYPE (lhs),
-					gsi, false);
+	    rhs = build_ref_for_model (loc, rhs, 0, lacc, gsi, false);
 
 	  if (!useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (rhs)))
 	    {