From 2c703f3a6a2a283318a0678fc8a5eba27b6663df Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@gcc.gnu.org>
Date: Thu, 12 May 2011 13:54:33 +0200
Subject: re PR debug/48967 (ICE during use_narrower_mode)

	PR debug/48967
	* var-tracking.c (use_narrower_mode_test) <case REG>: Return 1
	if validate_subreg fails.

	* g++.dg/opt/pr48967.C: New test.

From-SVN: r173701
---
 gcc/var-tracking.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'gcc/var-tracking.c')

diff --git a/gcc/var-tracking.c b/gcc/var-tracking.c
index 9041112..278f546 100644
--- a/gcc/var-tracking.c
+++ b/gcc/var-tracking.c
@@ -745,6 +745,10 @@ use_narrower_mode_test (rtx *loc, void *data)
     case REG:
       if (cselib_lookup (*loc, GET_MODE (SUBREG_REG (subreg)), 0, VOIDmode))
 	return 1;
+      if (!validate_subreg (GET_MODE (subreg), GET_MODE (*loc),
+			    *loc, subreg_lowpart_offset (GET_MODE (subreg),
+							 GET_MODE (*loc))))
+	return 1;
       return -1;
     case PLUS:
     case MINUS:
-- 
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