re PR tree-optimization/51466 (ICE in gimple_rhs_has_side_effects,)

	PR tree-optimization/51466
	* tree-ssa-forwprop.c (forward_propagate_addr_expr_1): Also copy
	TREE_SIDE_EFFECTS.

	* gcc.c-torture/execute/pr51466.c: New test.

From-SVN: r182136

gcc/ChangeLog

+2011-12-08  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/51466
+	* tree-ssa-forwprop.c (forward_propagate_addr_expr_1): Also copy
+	TREE_SIDE_EFFECTS.
+
 2011-12-08  Richard Guenther  <rguenther@suse.de>
 
 	* tree-ssa-operands.c (add_stmt_operand): Do not mark stmts

gcc/testsuite/ChangeLog

+2011-12-08  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/51466
+	* gcc.c-torture/execute/pr51466.c: New test.
+
 2011-12-08  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/50815

gcc/testsuite/gcc.c-torture/execute/pr51466.c

+/* PR tree-optimization/51466 */
+
+extern void abort (void);
+
+__attribute__((noinline, noclone)) int
+foo (int i)
+{
+  volatile int v[4];
+  int *p;
+  v[i] = 6;
+  p = (int *) &v[i];
+  return *p;
+}
+
+__attribute__((noinline, noclone)) int
+bar (int i)
+{
+  volatile int v[4];
+  int *p;
+  v[i] = 6;
+  p = (int *) &v[i];
+  *p = 8;
+  return v[i];
+}
+
+__attribute__((noinline, noclone)) int
+baz (int i)
+{
+  volatile int v[4];
+  int *p;
+  v[i] = 6;
+  p = (int *) &v[0];
+  *p = 8;
+  return v[i];
+}
+
+int
+main ()
+{
+  if (foo (3) != 6 || bar (2) != 8 || baz (0) != 8 || baz (1) != 6)
+    abort ();
+  return 0;
+}

gcc/tree-ssa-forwprop.c

@@ -929,10 +929,12 @@ forward_propagate_addr_expr_1 (tree name, tree def_rhs,
 	  *def_rhs_basep = build2 (MEM_REF, TREE_TYPE (*def_rhs_basep),
 				   new_base, new_offset);
 	  TREE_THIS_VOLATILE (*def_rhs_basep) = TREE_THIS_VOLATILE (lhs);
+	  TREE_SIDE_EFFECTS (*def_rhs_basep) = TREE_SIDE_EFFECTS (lhs);
 	  TREE_THIS_NOTRAP (*def_rhs_basep) = TREE_THIS_NOTRAP (lhs);
 	  new_lhs = unshare_expr (TREE_OPERAND (def_rhs, 0));
 	  gimple_assign_set_lhs (use_stmt, new_lhs);
 	  TREE_THIS_VOLATILE (new_lhs) = TREE_THIS_VOLATILE (lhs);
+	  TREE_SIDE_EFFECTS (new_lhs) = TREE_SIDE_EFFECTS (lhs);
 	  *def_rhs_basep = saved;
 	  tidy_after_forward_propagate_addr (use_stmt);
 	  /* Continue propagating into the RHS if this was not the
@@ -1011,10 +1013,12 @@ forward_propagate_addr_expr_1 (tree name, tree def_rhs,
 	  *def_rhs_basep = build2 (MEM_REF, TREE_TYPE (*def_rhs_basep),
 				   new_base, new_offset);
 	  TREE_THIS_VOLATILE (*def_rhs_basep) = TREE_THIS_VOLATILE (rhs);
+	  TREE_SIDE_EFFECTS (*def_rhs_basep) = TREE_SIDE_EFFECTS (rhs);
 	  TREE_THIS_NOTRAP (*def_rhs_basep) = TREE_THIS_NOTRAP (rhs);
 	  new_rhs = unshare_expr (TREE_OPERAND (def_rhs, 0));
 	  gimple_assign_set_rhs1 (use_stmt, new_rhs);
 	  TREE_THIS_VOLATILE (new_rhs) = TREE_THIS_VOLATILE (rhs);
+	  TREE_SIDE_EFFECTS (new_rhs) = TREE_SIDE_EFFECTS (rhs);
 	  *def_rhs_basep = saved;
 	  fold_stmt_inplace (use_stmt_gsi);
 	  tidy_after_forward_propagate_addr (use_stmt);