From: ja2morri at csclub dot uwaterloo dot ca (James A dot  Morrison)
Date: Mon, 25 Jul 2005 10:37:52 -0400

Hi,

This fixes PR22550 by simply returning COND in vrp_evaluate_condition if
it is an INTEGER_CST.  In PR22550 I believe the if (0) comes from
merge_seq_blocks which is called after cleanup_control_flow in
cleanup_tree_cfg.  This patch has been bootstrapped and regtested on ia64-linux
with no new regressions, ok for mainline?

Thanks,
Jim

2005-07-25  James A. Morrison  <phython@gcc.gnu.org>

	PR tree-optimization/22550
	* tree-vrp.c (vrp_evaluate_condition): Return COND if it is an
	INTEGER_CST.

--- gcc/gcc/tree-vrp.c	20 Jul 2005 20:26:00 -0000	2.42
+++ gcc/gcc/tree-vrp.c	25 Jul 2005 14:22:55 -0000
@@ -3014,6 +3072,9 @@ compare_names (enum tree_code comp, tree
 tree
 vrp_evaluate_conditional (tree cond, bool use_equiv_p)
 {
+  if (TREE_CODE (cond) == INTEGER_CST)
+    return cond;
+
   gcc_assert (TREE_CODE (cond) == SSA_NAME
               || TREE_CODE_CLASS (TREE_CODE (cond)) == tcc_comparison);