From patchwork Fri Sep 16 07:04:54 2011
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: do not copy DEBUG_EXPRs in copy_insn
Date: Thu, 15 Sep 2011 21:04:54 -0000
From: Alexandre Oliva <aoliva@redhat.com>
X-Patchwork-Id: 114893
Message-Id: <orvcst9dd5.fsf@livre.localdomain>
To: gcc-patches@gcc.gnu.org

copy_rtx avoids duplicating DEBUG_EXPRs, so that they map one-to-one to
DEBUG_EXPR_DECLs, but copy_insn lacks these smarts.  This was exposed by
a patch I'm working on, that uses RTL flags in DEBUG_EXPRs to speed up
expansion of var location notes within var-tracking.

Regstrapped on i686-pc-linux-gnu and x86_64-linux-gnu.  Ok to install?


for  gcc/ChangeLog
from  Alexandre Oliva  <aoliva@redhat.com>

	* emit-rtl.c (copy_insn_1): Do not copy DEBUG_EXPRs.

Index: gcc/emit-rtl.c
===================================================================
--- gcc/emit-rtl.c.orig	2011-09-15 03:51:41.982777588 -0300
+++ gcc/emit-rtl.c	2011-09-15 03:51:50.767633680 -0300
@@ -5269,6 +5269,7 @@ copy_insn_1 (rtx orig)
   switch (code)
     {
     case REG:
+    case DEBUG_EXPR:
     case CONST_INT:
     case CONST_DOUBLE:
     case CONST_FIXED: