re PR debug/46150 (-fcompare-debug failure (length) with -fPIC -O2)

	PR debug/46150
	* tree-ssa-loop-ivopts.c (htab_inv_expr_eq): Don't return
	true if expr1->hash != expr2->hash.

From-SVN: r166595

gcc/ChangeLog

+2010-11-11  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/46150
+	* tree-ssa-loop-ivopts.c (htab_inv_expr_eq): Don't return
+	true if expr1->hash != expr2->hash.
+
 2010-11-10  Joseph Myers  <joseph@codesourcery.com>
 
 	* cfgloop.c (verify_loop_structure): Use %' in diagnostics.  Start

gcc/tree-ssa-loop-ivopts.c

@@ -834,7 +834,8 @@ htab_inv_expr_eq (const void *ent1, const void *ent2)
   const struct iv_inv_expr_ent *expr2 =
       (const struct iv_inv_expr_ent *)ent2;
 
-  return operand_equal_p (expr1->expr, expr2->expr, 0);
+  return expr1->hash == expr2->hash
+	 && operand_equal_p (expr1->expr, expr2->expr, 0);
 }
 
 /* Hash function for loop invariant expressions.  */