From 9b04c6a896b81889fb94e7878cef705b1ef716c4 Mon Sep 17 00:00:00 2001
From: Richard Kenner <kenner@gcc.gnu.org>
Date: Fri, 8 Nov 1996 18:55:41 -0500
Subject: [PATCH] (change_address): If MEMREF isn't changing, return the old
 one.

From-SVN: r13115
---
 gcc/emit-rtl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index 337e9732f52..66b5d22696e 100644
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -1376,6 +1376,9 @@ change_address (memref, mode, addr)
   else
     addr = memory_address (mode, addr);
 	
+  if (rtx_equal_p (addr, XEXP (memref, 0)) && mode == GET_MODE (memref))
+    return memref;
+
   new = gen_rtx (MEM, mode, addr);
   MEM_VOLATILE_P (new) = MEM_VOLATILE_P (memref);
   RTX_UNCHANGING_P (new) = RTX_UNCHANGING_P (memref);
-- 
2.30.2