From ce79abf32c694488933ef4594f8adfe6317236d7 Mon Sep 17 00:00:00 2001
From: Jim Wilson <wilson@gcc.gnu.org>
Date: Wed, 29 Mar 1995 14:34:41 -0800
Subject: [PATCH] (mark_used_regs, case SUBREG): Only fall through to REG case
 if operand is a REG.

From-SVN: r9247
---
 gcc/flow.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gcc/flow.c b/gcc/flow.c
index 585d240..5ebaf25 100644
--- a/gcc/flow.c
+++ b/gcc/flow.c
@@ -2385,6 +2385,11 @@ mark_used_regs (needed, live, x, final, insn)
       /* While we're here, optimize this case.  */
       x = SUBREG_REG (x);
 
+      /* Must verify that it is a register, since the RS/6000 port has
+	 (subreg:QI (lshift:SI ...)).  */
+      if (GET_CODE (x) != REG)
+	goto retry;
+
       /* ... fall through ... */
 
     case REG:
-- 
2.7.4