From 5b2686e66a6a147680082e9dc2877e26b5f4233e Mon Sep 17 00:00:00 2001
From: rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 5 Aug 2011 16:12:16 +0000
Subject: PR rtl-opt/49982         * expr.c (fixup_args_size_notes): Look
 through no-op moves.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@177464 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/expr.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'gcc/expr.c')

diff --git a/gcc/expr.c b/gcc/expr.c
index e5bec34e78c..f170596d330 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -3631,6 +3631,10 @@ fixup_args_size_notes (rtx prev, rtx last, int end_args_size)
 	      && XEXP (SET_SRC (set), 0) == stack_pointer_rtx
 	      && CONST_INT_P (XEXP (SET_SRC (set), 1)))
 	    this_delta = INTVAL (XEXP (SET_SRC (set), 1));
+	  /* ??? Reload can generate no-op moves, which will be cleaned
+	     up later.  Recognize it and continue searching.  */
+	  else if (rtx_equal_p (dest, SET_SRC (set)))
+	    this_delta = 0;
 	  else
 	    saw_unknown = true;
 	}
-- 
cgit v1.2.3