From 4dca5ec5b8066d1ba161e3c5c93d6ff383bcf567 Mon Sep 17 00:00:00 2001
From: Richard Kenner <kenner@gcc.gnu.org>
Date: Tue, 18 Oct 1994 19:10:20 -0400
Subject: [PATCH] (can_combine_p): Don't combine into CALL_INSN where DEST is a
 global reg.

From-SVN: r8305
---
 gcc/combine.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gcc/combine.c b/gcc/combine.c
index 27875e51e5e..4399bb0863e 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -875,7 +875,11 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc)
       /* Can't merge a function call.  */
       || GET_CODE (src) == CALL
       /* Don't eliminate a function call argument.  */
-      || (GET_CODE (i3) == CALL_INSN && find_reg_fusage (i3, USE, dest))
+      || (GET_CODE (i3) == CALL_INSN
+	  && (find_reg_fusage (i3, USE, dest)
+	      || (GET_CODE (dest) == REG
+		  && REGNO (dest) < FIRST_PSEUDO_REGISTER
+		  && global_regs[REGNO (dest)])))
       /* Don't substitute into an incremented register.  */
       || FIND_REG_INC_NOTE (i3, dest)
       || (succ && FIND_REG_INC_NOTE (succ, dest))
-- 
2.30.2