===================================================================
@@ -2012,9 +2268,11 @@ vn_reference_lookup_3 (ao_ref *ref, tree
if (res && res != (void *)-1)
{
vn_reference_t vnresult = (vn_reference_t) res;
+ tree rhs = gimple_assign_rhs1 (def_stmt);
+ if (TREE_CODE (rhs) == SSA_NAME)
+ rhs = SSA_VAL (rhs);
if (vnresult->result
- && operand_equal_p (vnresult->result,
- gimple_assign_rhs1 (def_stmt), 0))
+ && operand_equal_p (vnresult->result, rhs, 0))
return res;
}
}
===================================================================
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-fre1" } */
+
+int foo (int *p, int *q)
+{
+ int x;
+ *p = 1;
+ x = *p;
+ *q = x;
+ return *p;
+}
+
+/* { dg-final { scan-tree-dump "return 1;" "fre1" } } */