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[vta, vta4.3] VAR_LOCATION has no side effects
- From: Alexandre Oliva <aoliva at redhat dot com>
- To: gcc-patches at gcc dot gnu dot org
- Date: Tue, 12 Aug 2008 03:21:06 -0300
- Subject: [vta, vta4.3] VAR_LOCATION has no side effects
At some point, while preparing an upcoming patch, I accidentally ended
up with clobbers with modes (other than VOIDmode) in debug
annotations, and this caused such insns to be marked as having side
effects, which was unexpected and IIRC caused differences in codegen.
The need for this change was obviated by using clobbers with VOIDmode
and by other changes that avoid scanning debug insns for side effects,
but I thought I'd check this in anyway.
for gcc/ChangeLog.vta
from Alexandre Oliva <aoliva@redhat.com>
* rtlanal.c (side_effects_p): Not in VAR_LOCATION.
Index: gcc/rtlanal.c
===================================================================
--- gcc/rtlanal.c.orig 2008-02-19 03:28:57.000000000 -0300
+++ gcc/rtlanal.c 2008-08-06 03:47:27.000000000 -0300
@@ -1,6 +1,6 @@
/* Analyze RTL for GNU compiler.
Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software
Foundation, Inc.
This file is part of GCC.
@@ -2116,6 +2116,7 @@ side_effects_p (const_rtx x)
case SCRATCH:
case ADDR_VEC:
case ADDR_DIFF_VEC:
+ case VAR_LOCATION:
return 0;
case CLOBBER:
--
Alexandre Oliva http://www.lsd.ic.unicamp.br/~oliva/
Free Software Evangelist oliva@{lsd.ic.unicamp.br, gnu.org}
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