--- Comment #8 from rguenth at gcc dot gnu dot org 2010-01-20 11:42 ---
mgrid now miscompares on i?86 ...
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41879
--- Comment #9 from matz at gcc dot gnu dot org 2010-01-20 14:42 ---
See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35418#c8
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41879
--- Comment #10 from steven at gcc dot gnu dot org 2010-01-20 15:25 ---
Is there an alt.src for this from SPEC?
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41879
--- Comment #11 from rguenther at suse dot de 2010-01-20 15:31 ---
Subject: Re: [4.5 Regression] 172.mgrid
regression, vectorizer prevents predictive commoning
On Wed, 20 Jan 2010, steven at gcc dot gnu dot org wrote:
--- Comment #10 from steven at gcc dot gnu dot org
--- Comment #7 from rguenth at gcc dot gnu dot org 2010-01-19 16:20 ---
Fixed by
Author: matz
Date: Tue Jan 19 16:05:57 2010
New Revision: 156043
URL: http://gcc.gnu.org/viewcvs?root=gccview=revrev=156043
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rguenth at gcc dot gnu dot org changed:
What|Removed
--- Comment #6 from rguenth at gcc dot gnu dot org 2009-11-12 15:17 ---
The idea is to call predcom analysis and hook it into the vectorizer as another
vectorization form for the cost model.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41879
--- Comment #4 from rguenth at gcc dot gnu dot org 2009-11-11 20:38 ---
I didn't check yet. We'll work on a simple cost-model integration of
predcom.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41879
--- Comment #5 from irar at il dot ibm dot com 2009-11-12 07:51 ---
(In reply to comment #4)
I didn't check yet. We'll work on a simple cost-model integration of
predcom.
You mean, vectorizer cost model will take predcom into account?
If the vectorization is not profitable (vs.
--- Comment #3 from irar at il dot ibm dot com 2009-11-10 10:02 ---
(In reply to comment #0)
This causes mgrid score to drop
by almost 40% on x86_64 and the vectorized code is pretty bad because it
uses unaligned accesses.
Is the vectorized code worse than the scalar one even
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rguenth at gcc dot gnu dot org changed:
What|Removed |Added
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
--- Comment #1 from rguenth at gcc dot gnu dot org 2009-10-30 16:57 ---
Testcase:
SUBROUTINE PSINV(R,U,C)
PARAMETER (N=64)
REAL*8 U(N,N,N),R(N,N,N),C(0:3)
INTEGER I3, I2, I1
C
DO 600 I3=2,N-1
DO 600 I2=2,N-1
DO 600 I1=2,N-1
600
--- Comment #2 from rguenth at gcc dot gnu dot org 2009-10-30 17:00 ---
With vectorization enabled I get
Running /home/richard/src/trunk/gcc/testsuite/gcc.dg/tree-ssa/tree-ssa.exp ...
FAIL: gcc.dg/tree-ssa/predcom-1.c scan-tree-dump-times pcom looparound ref 1
FAIL:
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