From b81fd0f4f23b8a207fd2ac04f88b995843d67b6f Mon Sep 17 00:00:00 2001
From: Richard Stallman <rms@gnu.org>
Date: Wed, 23 Sep 1992 03:46:26 +0000
Subject: [PATCH] (basic_induction_var): Inside PLUS, when looking for promoted
 var, make sure it's a REG.

From-SVN: r2210
---
 gcc/loop.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/loop.c b/gcc/loop.c
index e4b47db3cdf..87509be4b14 100644
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -4693,7 +4693,8 @@ basic_induction_var (x, dest_reg, p, inc_val, mult_val)
  	arg = XEXP (x, 1);
       else if (XEXP (x, 1) == dest_reg
 	       || (GET_CODE (XEXP (x, 1)) == SUBREG
-		   && SUBREG_PROMOTED_VAR_P (XEXP (x, 1))))
+		   && SUBREG_PROMOTED_VAR_P (XEXP (x, 1))
+		   && SUBREG_REG (XEXP (x, 1)) == dest_reg))
 	arg = XEXP (x, 0);
       else
  	return 0;
-- 
2.30.2