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From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/19580] [4.0/4.1/4.2/4.3 Regression] missed load/store motion
Date: Wed, 12 Sep 2007 14:44:00 -0000 [thread overview]
Message-ID: <20070912144407.13632.qmail@sourceware.org> (raw)
In-Reply-To: <bug-19580-7958@http.gcc.gnu.org/bugzilla/>
------- Comment #32 from rguenth at gcc dot gnu dot org 2007-09-12 14:44 -------
load-store motion at the tree level should really catch this. For this it
needs to be extended to disambiguate aliases by looking at the actual memory
references:
<bb 4>:
# r_8 = PHI <r_29(5), r_23(D)(3)>
# n_11 = PHI <n_3(5), n_14(3)>
# VUSE <r_8>
D.1137_4 = r[0];
# VUSE <r_8>
D.1138_5 = r[5];
D.1139_6 = D.1138_5 + D.1137_4;
# r_24 = VDEF <r_8>
r[0] = D.1139_6;
# VUSE <r_24>
D.1140_7 = r[1];
D.1141_9 = D.1139_6 + D.1140_7;
...
# r_29 = VDEF <r_28>
r[5] = D.1148_21;
n_3 = n_11 + -1;
if (n_3 != 0)
goto <bb 5>;
else
goto <bb 6>;
Zdenek, I think you had a patch to make lim more precise in this regard?
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rakdver at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19580
next prev parent reply other threads:[~2007-09-12 14:44 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-19580-7958@http.gcc.gnu.org/bugzilla/>
2005-10-16 22:14 ` [Bug rtl-optimization/19580] [3.4/4.0/4.1 " pinskia at gcc dot gnu dot org
2005-10-17 10:28 ` uros at kss-loka dot si
2005-10-31 2:34 ` mmitchel at gcc dot gnu dot org
2006-02-03 16:44 ` [Bug rtl-optimization/19580] [3.4/4.0/4.1/4.2 " steven at gcc dot gnu dot org
2006-02-04 13:52 ` rguenth at gcc dot gnu dot org
2006-02-04 21:30 ` dberlin at gcc dot gnu dot org
2006-02-14 16:48 ` rguenth at gcc dot gnu dot org
2006-02-24 0:25 ` mmitchel at gcc dot gnu dot org
2006-05-25 2:34 ` [Bug rtl-optimization/19580] [4.0/4.1/4.2 " mmitchel at gcc dot gnu dot org
2007-02-14 9:05 ` [Bug rtl-optimization/19580] [4.0/4.1/4.2/4.3 " mmitchel at gcc dot gnu dot org
2007-04-17 5:53 ` dberlin at gcc dot gnu dot org
2007-04-17 8:22 ` rguenth at gcc dot gnu dot org
2007-09-12 14:44 ` rguenth at gcc dot gnu dot org [this message]
2007-09-12 14:49 ` rakdver at gcc dot gnu dot org
2007-09-12 15:09 ` eres at il dot ibm dot com
2007-09-13 4:45 ` eres at il dot ibm dot com
2008-01-23 9:28 ` steven at gcc dot gnu dot org
2008-01-23 10:35 ` rguenth at gcc dot gnu dot org
2008-03-28 13:41 ` [Bug rtl-optimization/19580] [4.1/4.2/4.3 " rguenth at gcc dot gnu dot org
2008-03-28 13:46 ` rguenth at gcc dot gnu dot org
2008-07-04 16:49 ` [Bug rtl-optimization/19580] [4.2/4.3 " jsm28 at gcc dot gnu dot org
2009-03-31 16:46 ` [Bug rtl-optimization/19580] [4.3 " jsm28 at gcc dot gnu dot org
2009-04-22 15:09 ` rguenth at gcc dot gnu dot org
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