* [Bug middle-end/42181] -fgraphite-identity miscompiles or ICEs on air.f90
2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
@ 2009-11-26 17:03 ` jv244 at cam dot ac dot uk
2009-11-26 17:04 ` jv244 at cam dot ac dot uk
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From: jv244 at cam dot ac dot uk @ 2009-11-26 17:03 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from jv244 at cam dot ac dot uk 2009-11-26 17:02 -------
*** Bug 41051 has been marked as a duplicate of this bug. ***
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
2009-11-26 17:03 ` [Bug middle-end/42181] " jv244 at cam dot ac dot uk
@ 2009-11-26 17:04 ` jv244 at cam dot ac dot uk
2009-11-26 17:05 ` [Bug middle-end/42181] [4.5 Regression] " jv244 at cam dot ac dot uk
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From: jv244 at cam dot ac dot uk @ 2009-11-26 17:04 UTC (permalink / raw)
To: gcc-bugs
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 1069 bytes --]
------- Comment #2 from jv244 at cam dot ac dot uk 2009-11-26 17:04 -------
the following is a testcase for the ICE (derived from CP2K bug crashes in the
same place):
> cat bug.f90
MODULE powell
INTEGER, PARAMETER :: dp=8
CONTAINS
SUBROUTINE newuob (n,npt,x,rhobeg,rhoend,maxfun,xbase,&
xopt,xnew,xpt,fval,gq,hq,pq,bmat,zmat,ndim,d,vlag,w,opt)
REAL(dp), DIMENSION(npt, *), &
INTENT(inout) :: xpt
REAL(dp), DIMENSION(*), INTENT(inout) :: fval, gq, hq, pq
120 IF (dsq <= 1.0e-3_dp*xoptsq) THEN
DO k=1,npt
DO i=1,n
gq(i)=gq(i)+temp*xpt(k,i)
END DO
END DO
END IF
END SUBROUTINE newuob
END MODULE powell
gfortran -fgraphite -O1 bug.f90
bug.f90: In function ‘__powell_MOD_newuob’:
bug.f90:4:0: internal compiler error: in scan_tree_for_params, at
graphite-sese-to-poly.c:853
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
2009-11-26 17:03 ` [Bug middle-end/42181] " jv244 at cam dot ac dot uk
2009-11-26 17:04 ` jv244 at cam dot ac dot uk
@ 2009-11-26 17:05 ` jv244 at cam dot ac dot uk
2009-11-27 11:32 ` rguenth at gcc dot gnu dot org
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From: jv244 at cam dot ac dot uk @ 2009-11-26 17:05 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from jv244 at cam dot ac dot uk 2009-11-26 17:05 -------
the ice is absent in 4.4 but present in 4.5 trunk
--
jv244 at cam dot ac dot uk changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2009-11-26 17:05:43
date| |
Summary|-fgraphite-identity |[4.5 Regression] -fgraphite-
|miscompiles or ICEs on |identity miscompiles or ICEs
|air.f90 |on air.f90
Target Milestone|--- |4.5.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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` (2 preceding siblings ...)
2009-11-26 17:05 ` [Bug middle-end/42181] [4.5 Regression] " jv244 at cam dot ac dot uk
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To: gcc-bugs
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code, wrong-
| |code
Priority|P3 |P1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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2009-11-27 11:32 ` rguenth at gcc dot gnu dot org
@ 2009-12-14 19:03 ` spop at gcc dot gnu dot org
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From: spop at gcc dot gnu dot org @ 2009-12-14 19:03 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from spop at gcc dot gnu dot org 2009-12-14 19:03 -------
Fixed in the Graphite branch. I will commit it to trunk after test.
--
spop at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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` (4 preceding siblings ...)
2009-12-14 19:03 ` spop at gcc dot gnu dot org
@ 2009-12-14 19:03 ` spop at gcc dot gnu dot org
2009-12-23 7:50 ` spop at gcc dot gnu dot org
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From: spop at gcc dot gnu dot org @ 2009-12-14 19:03 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from spop at gcc dot gnu dot org 2009-12-14 19:02 -------
Subject: Bug 42181
Author: spop
Date: Mon Dec 14 19:02:37 2009
New Revision: 155233
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=155233
Log:
Fix PR42181.
2009-12-14 Sebastian Pop <sebastian.pop@amd.com>
PR middle-end/42181
* graphite-scop-detection.c (graphite_can_represent_scev): Handle more
carefully PLUS_EXPR, MINUS_EXPR, and MULT_EXPR.
* testsuite/gfortran.dg/graphite/pr42181.f90: New.
Added:
branches/graphite/gcc/testsuite/gfortran.dg/graphite/pr42181.f90
Modified:
branches/graphite/gcc/ChangeLog.graphite
branches/graphite/gcc/graphite-scop-detection.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread* [Bug middle-end/42181] [4.5 Regression] -fgraphite-identity miscompiles or ICEs on air.f90
2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
` (5 preceding siblings ...)
2009-12-14 19:03 ` spop at gcc dot gnu dot org
@ 2009-12-23 7:50 ` spop at gcc dot gnu dot org
2009-12-24 0:14 ` howarth at nitro dot med dot uc dot edu
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From: spop at gcc dot gnu dot org @ 2009-12-23 7:50 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from spop at gcc dot gnu dot org 2009-12-23 07:50 -------
Subject: Bug 42181
Author: spop
Date: Wed Dec 23 07:50:00 2009
New Revision: 155417
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=155417
Log:
Fix PR42181.
2009-12-14 Sebastian Pop <sebastian.pop@amd.com>
PR middle-end/42181
* graphite-scop-detection.c (graphite_can_represent_scev): Handle more
carefully PLUS_EXPR, MINUS_EXPR, and MULT_EXPR.
* testsuite/gfortran.dg/graphite/pr42181.f90: New.
Added:
trunk/gcc/testsuite/gfortran.dg/graphite/pr42181.f90
Modified:
trunk/gcc/ChangeLog.graphite
trunk/gcc/graphite-scop-detection.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
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2009-12-23 7:50 ` spop at gcc dot gnu dot org
@ 2009-12-24 0:14 ` howarth at nitro dot med dot uc dot edu
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From: howarth at nitro dot med dot uc dot edu @ 2009-12-24 0:14 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from howarth at nitro dot med dot uc dot edu 2009-12-24 00:14 -------
This still appears to be broken at r155434 on x86_64-apple-darwin10 with...
gfortran -O2 -fgraphite-identity air.f90 -o air
./air
AIRFLOW IN A BOX
Version 2.0
(c) Hanley Innovations 1995
1.00000000000000002E-002 0.29999999999999999 10.000000000000000
0.10000000000000001 0
272.76999999999998 272.76999999999998 272.76999999999998
272.76999999999998 0.0000000000000000
11 12
X-DATA
1 0.0000000000000000 0.10000000000000001 4
2 5.00000000000000028E-002 0.22000000000000000 4
3 0.10000000000000001 0.29999999999999999 4
4 0.20000000000000001 0.40000000000000002 4
5 0.29999999999999999 0.50000000000000000 4
6 0.40000000000000002 0.59999999999999998 4
7 0.50000000000000000 0.69999999999999996 4
8 0.59999999999999998 0.80000000000000004 4
9 0.69999999999999996 0.90000000000000002 4
10 0.80000000000000004 0.96999999999999997 4
11 0.90000000000000002 1.0000000000000000 4
Y-DATA
0.0000000000000000 0.10000000000000001 4
4.00000000000000008E-002 0.14999999999999999 4
8.00000000000000017E-002 0.20000000000000001 4
0.14999999999999999 0.29999999999999999 4
0.20000000000000001 0.40000000000000002 4
0.29999999999999999 0.50000000000000000 4
0.40000000000000002 0.59999999999999998 4
0.50000000000000000 0.69999999999999996 4
0.59999999999999998 0.80000000000000004 4
0.69999999999999996 0.89000000000000001 4
0.80000000000000004 0.94999999999999996 4
0.94999999999999996 1.0000000000000000 4
ITERATION# TIME FINAL MASS RESIDUAL
14 100.000043187820 0.01000000 NaN
deltat, final t, iterations
100.00000000000000 100.00004318782042 14
14 NaN
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
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2009-12-24 0:14 ` howarth at nitro dot med dot uc dot edu
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2009-12-24 0:18 ` howarth at nitro dot med dot uc dot edu
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From: howarth at nitro dot med dot uc dot edu @ 2009-12-24 0:15 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from howarth at nitro dot med dot uc dot edu 2009-12-24 00:15 -------
Still broke on x86_64-apple-darwin10.
--
howarth at nitro dot med dot uc dot edu changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread* [Bug middle-end/42181] [4.5 Regression] -fgraphite-identity miscompiles or ICEs on air.f90
2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
` (8 preceding siblings ...)
2009-12-24 0:15 ` howarth at nitro dot med dot uc dot edu
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From: howarth at nitro dot med dot uc dot edu @ 2009-12-24 0:18 UTC (permalink / raw)
To: gcc-bugs
------- Comment #9 from howarth at nitro dot med dot uc dot edu 2009-12-24 00:18 -------
Created an attachment (id=19380)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19380&action=view)
assembly from 'gfortran -O2 -fgraphite-identity air.f90 --save-temps -o air' on
x86_64-apple-darwin10 at r155434
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread* [Bug middle-end/42181] [4.5 Regression] -fgraphite-identity miscompiles or ICEs on air.f90
2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
` (9 preceding siblings ...)
2009-12-24 0:18 ` howarth at nitro dot med dot uc dot edu
@ 2009-12-24 0:20 ` howarth at nitro dot med dot uc dot edu
2009-12-24 8:13 ` dominiq at lps dot ens dot fr
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From: howarth at nitro dot med dot uc dot edu @ 2009-12-24 0:20 UTC (permalink / raw)
To: gcc-bugs
------- Comment #10 from howarth at nitro dot med dot uc dot edu 2009-12-24 00:20 -------
Problem doesn't exist for -O1 -fgraphite-identity on x86_64-apple-darwin10.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
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2009-12-24 0:20 ` howarth at nitro dot med dot uc dot edu
@ 2009-12-24 8:13 ` dominiq at lps dot ens dot fr
2010-01-14 16:57 ` trifunovic at gcc dot gnu dot org
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From: dominiq at lps dot ens dot fr @ 2009-12-24 8:13 UTC (permalink / raw)
To: gcc-bugs
------- Comment #11 from dominiq at lps dot ens dot fr 2009-12-24 08:12 -------
*** Bug 42480 has been marked as a duplicate of this bug. ***
--
dominiq at lps dot ens dot fr changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dominiq at lps dot ens dot
| |fr
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread* [Bug middle-end/42181] [4.5 Regression] -fgraphite-identity miscompiles or ICEs on air.f90
2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
` (11 preceding siblings ...)
2009-12-24 8:13 ` dominiq at lps dot ens dot fr
@ 2010-01-14 16:57 ` trifunovic at gcc dot gnu dot org
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From: trifunovic at gcc dot gnu dot org @ 2010-01-14 16:57 UTC (permalink / raw)
To: gcc-bugs
--
trifunovic at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |trifunovic at gcc dot gnu
|dot org |dot org
Status|REOPENED |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
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2010-01-14 16:57 ` trifunovic at gcc dot gnu dot org
@ 2010-01-14 19:25 ` spop at gcc dot gnu dot org
2010-02-06 17:44 ` [Bug middle-end/42181] [4.5 Regression][graphite] " spop at gcc dot gnu dot org
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From: spop at gcc dot gnu dot org @ 2010-01-14 19:25 UTC (permalink / raw)
To: gcc-bugs
------- Comment #12 from spop at gcc dot gnu dot org 2010-01-14 19:24 -------
The kernel from Comment #2 looks identical to the kernel from PR42637 that is
also miscompiled.
These two PRs may be the same.
Konrad, could you look at the testcase from PR42637 that is more precise?
Thanks,
Sebastian
--
spop at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn| |42637
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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` (13 preceding siblings ...)
2010-01-14 19:25 ` spop at gcc dot gnu dot org
@ 2010-02-06 17:44 ` spop at gcc dot gnu dot org
2010-03-08 23:09 ` [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90 howarth at nitro dot med dot uc dot edu
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From: spop at gcc dot gnu dot org @ 2010-02-06 17:44 UTC (permalink / raw)
To: gcc-bugs
------- Comment #13 from spop at gcc dot gnu dot org 2010-02-06 17:44 -------
Still fails after PR42637 has been fixed.
NB: that this miscompile is for -fgraphite-identity not with the loop opts.
--
spop at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn|42637 |
AssignedTo|trifunovic at gcc dot gnu |spop at gcc dot gnu dot org
|dot org |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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` (14 preceding siblings ...)
2010-02-06 17:44 ` [Bug middle-end/42181] [4.5 Regression][graphite] " spop at gcc dot gnu dot org
@ 2010-03-08 23:09 ` howarth at nitro dot med dot uc dot edu
2010-03-08 23:16 ` spop at gcc dot gnu dot org
` (18 subsequent siblings)
34 siblings, 0 replies; 39+ messages in thread
From: howarth at nitro dot med dot uc dot edu @ 2010-03-08 23:09 UTC (permalink / raw)
To: gcc-bugs
------- Comment #14 from howarth at nitro dot med dot uc dot edu 2010-03-08 23:09 -------
Is this issue to be fixed for gcc 4.5?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
` (15 preceding siblings ...)
2010-03-08 23:09 ` [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90 howarth at nitro dot med dot uc dot edu
@ 2010-03-08 23:16 ` spop at gcc dot gnu dot org
2010-03-09 2:26 ` howarth at nitro dot med dot uc dot edu
` (17 subsequent siblings)
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From: spop at gcc dot gnu dot org @ 2010-03-08 23:16 UTC (permalink / raw)
To: gcc-bugs
------- Comment #15 from spop at gcc dot gnu dot org 2010-03-08 23:16 -------
Yes.
I think it is important to understand what is miscompiled with the graphite
identity.
I will try to reduce this.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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` (16 preceding siblings ...)
2010-03-08 23:16 ` spop at gcc dot gnu dot org
@ 2010-03-09 2:26 ` howarth at nitro dot med dot uc dot edu
2010-03-09 2:34 ` howarth at nitro dot med dot uc dot edu
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From: howarth at nitro dot med dot uc dot edu @ 2010-03-09 2:26 UTC (permalink / raw)
To: gcc-bugs
------- Comment #16 from howarth at nitro dot med dot uc dot edu 2010-03-09 02:26 -------
The miscompiled code in air.f90 is the subroutine SPECTOP. If I pull that
subroutine out into a separate file and compile it at -O3 without
-fgraphite-identity, the remainder of the code can be compiled with
-fgraphite-identity at -O3 and the resulting binary runs fine on
x86_64-apple-darwin10.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
` (17 preceding siblings ...)
2010-03-09 2:26 ` howarth at nitro dot med dot uc dot edu
@ 2010-03-09 2:34 ` howarth at nitro dot med dot uc dot edu
2010-03-09 2:35 ` howarth at nitro dot med dot uc dot edu
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From: howarth at nitro dot med dot uc dot edu @ 2010-03-09 2:34 UTC (permalink / raw)
To: gcc-bugs
------- Comment #17 from howarth at nitro dot med dot uc dot edu 2010-03-09 02:34 -------
Created an attachment (id=20049)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20049&action=view)
assembly for spectop subroutine compiled at -O2 on x86_64-apple-darwin10
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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` (18 preceding siblings ...)
2010-03-09 2:34 ` howarth at nitro dot med dot uc dot edu
@ 2010-03-09 2:35 ` howarth at nitro dot med dot uc dot edu
2010-03-09 2:37 ` howarth at nitro dot med dot uc dot edu
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From: howarth at nitro dot med dot uc dot edu @ 2010-03-09 2:35 UTC (permalink / raw)
To: gcc-bugs
------- Comment #18 from howarth at nitro dot med dot uc dot edu 2010-03-09 02:35 -------
Created an attachment (id=20050)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20050&action=view)
assembly for spectop subroutine compiled at -graphite-identity -O2 on
x86_64-apple-darwin10
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread* [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
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From: howarth at nitro dot med dot uc dot edu @ 2010-03-09 2:37 UTC (permalink / raw)
To: gcc-bugs
------- Comment #19 from howarth at nitro dot med dot uc dot edu 2010-03-09 02:37 -------
Created an attachment (id=20051)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20051&action=view)
diff between assembly for spectop subroutine at -O2 without and with
-fgraphite-identity
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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From: howarth at nitro dot med dot uc dot edu @ 2010-03-09 3:45 UTC (permalink / raw)
To: gcc-bugs
------- Comment #20 from howarth at nitro dot med dot uc dot edu 2010-03-09 03:45 -------
The offending optimization for the spectop subroutine at -O2
-fgraphite-identity appears to be -fstrict-overflow. I can compile...
gfortran -fgraphite-identity -O3 -fno-strict-overflow -c spectop.f90
gfortran -O3 -fgraphite-identity air_sans_spectop.f90 spectop.o
and the resulting air benchmark runs fine.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread* [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
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2010-03-09 3:45 ` howarth at nitro dot med dot uc dot edu
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From: howarth at nitro dot med dot uc dot edu @ 2010-03-09 3:49 UTC (permalink / raw)
To: gcc-bugs
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 1425 bytes --]
------- Comment #21 from howarth at nitro dot med dot uc dot edu 2010-03-09 03:48 -------
Interestingly, I get...
gfortran -fgraphite-identity -O3 -Wstrict-overflow=5 -c spectop.f90
spectop.f90: In function ‘spectop’:
spectop.f90:5:0: warning: assuming signed overflow does not occur when changing
X +- C1 cmp C2 to X cmp C1 +- C2
spectop.f90:5:0: warning: assuming signed overflow does not occur when changing
X +- C1 cmp C2 to X cmp C1 +- C2
spectop.f90:5:0: warning: assuming signed overflow does not occur when reducing
constant in comparison
spectop.f90:5:0: warning: assuming signed overflow does not occur when changing
X +- C1 cmp C2 to X cmp C1 +- C2
spectop.f90:5:0: warning: assuming signed overflow does not occur when changing
X +- C1 cmp C2 to X cmp C1 +- C2
spectop.f90:5:0: warning: assuming signed overflow does not occur when changing
X +- C1 cmp C2 to X cmp C1 +- C2
spectop.f90:5:0: warning: assuming signed overflow does not occur when changing
X +- C1 cmp C2 to X cmp C1 +- C2
spectop.f90:5:0: warning: assuming signed overflow does not occur when changing
X +- C1 cmp C2 to X cmp C1 +- C2
whereas without -fgraphite-identity, I get...
gfortran -O3 -Wstrict-overflow=5 -c spectop.f90
spectop.f90: In function ‘spectop’:
spectop.f90:23:0: warning: assuming signed overflow does not occur when
changing X +- C1 cmp C2 to X cmp C1 +- C2
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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From: dominiq at lps dot ens dot fr @ 2010-03-09 13:32 UTC (permalink / raw)
To: gcc-bugs
------- Comment #22 from dominiq at lps dot ens dot fr 2010-03-09 13:32 -------
The following variant of spectop.f90 is miscompiled with '-fgraphite-identity
-O3':
SUBROUTINE SPECTOP(Dr,N)
IMPLICIT REAL*8(A-H,o-Z)
DIMENSION d1(0:32,0:32) , Dr(0:32,0:32) , x(0:32)
REAL*8 Dr
!
! PROGRAM TO COMPUTE THE CHEBYSHEV SPECTRAL OPERATOR
!
ang = DBLE(1)
s = DBLE(6)
o = DBLE(1)
t = DBLE(2)
pi = t*DASIN(ang)
DO i = 0 , N
x(i) = DCOS(pi*DBLE(i)/DBLE(N))
ENDDO
!
! IF J=K
!
DO j = 1 , N - 1
d1(j,j) = -x(j)/(t*(o-x(j)**2))
ENDDO
d1(0,0) = (t*DBLE(N)**2+o)/s
d1(N,N) = -d1(0,0)
!
! IF J.NE.K
!
fctr = -t
DO j = 1 , N-1
d1(0,j) = fctr/(x(0)-x(j))
fctr = -fctr
ENDDO
d1(0,N) = fctr/(t*(x(0)-x(N)))
fctr1 = -1.0D0
DO k = 1 , N-1
d1(k,0) = fctr1/(t*(x(k)-x(0)))
fctr = -fctr1
DO j = 1 , N-1
if (j.ne.k) d1(k,j) = fctr/(x(k)-x(j))
fctr = -fctr
ENDDO
d1(k,N) = fctr/(t*(x(k)-x(N)))
fctr1 = -fctr1
ENDDO
d1(N,0) = fctr1/(x(N)-x(0))
fctr = -t*fctr1
DO j = 1 , N-1
d1(N,j) = fctr/(x(N)-x(j))
fctr = -fctr
ENDDO
DO k = 0 , N
DO j = 0 , N
Dr(k,j) = d1(N-k,N-j)
ENDDO
ENDDO
CONTINUE
END
but is correctly compiled if
DO j = 1 , N-1
if (j.ne.k) d1(k,j) = fctr/(x(k)-x(j))
fctr = -fctr
ENDDO
is replaced with
DO j = 1 , k-1
d1(k,j) = fctr/(x(k)-x(j))
fctr = -fctr
ENDDO
fctr = -fctr
DO j = k+1 , N-1
d1(k,j) = fctr/(x(k)-x(j))
fctr = -fctr
ENDDO
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread* [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
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2010-03-09 13:32 ` dominiq at lps dot ens dot fr
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From: spop at gcc dot gnu dot org @ 2010-03-09 22:31 UTC (permalink / raw)
To: gcc-bugs
------- Comment #23 from spop at gcc dot gnu dot org 2010-03-09 22:31 -------
Thanks for reducing this testcase.
On the further reduced kernel:
SUBROUTINE SPECTOP(Dr,N)
IMPLICIT REAL*8(A-H,o-Z)
DIMENSION d1(0:32,0:32) , Dr(0:32,0:32) , x(0:32)
REAL*8 Dr
DO k = 1 , N-1
d1(k,0) = fctr1/(t*(x(k)-x(0)))
fctr = -fctr1
DO j = 1 , N-1
if (j.ne.k) d1(k,j) = fctr/(x(k)-x(j))
fctr = -fctr
ENDDO
d1(k,N) = fctr/(t*(x(k)-x(N)))
fctr1 = -fctr1
ENDDO
Dr(k,j) = d1(N-k,N-j)
CONTINUE
END
We have this CLAST generated by CLooG:
if (T_10 >= 3) {
S4(0) ;
S5(0,0) ;
S7(0,0) ;
for (scat_3=1;scat_3<=T_10-2;scat_3++) {
S5(0,scat_3) ;
S6(0,scat_3) ;
S7(0,scat_3) ;
}
S9(0) ;
S14(0) ;
}
for (scat_1=1;scat_1<=T_10-3;scat_1++) {
S4(scat_1) ;
S5(scat_1,scat_1) ;
S7(scat_1,scat_1) ;
for (scat_3=scat_1+1;scat_3<=T_10-2;scat_3++) {
S5(scat_1,scat_3) ;
S6(scat_1,scat_3) ;
S7(scat_1,scat_3) ;
}
for (scat_3=0;scat_3<=scat_1-1;scat_3++) {
S5(scat_1,scat_3) ;
S6(scat_1,scat_3) ;
S7(scat_1,scat_3) ;
}
S9(scat_1) ;
S14(scat_1) ;
}
if (T_10 >= 3) {
S4(T_10-2) ;
S5(T_10-2,T_10-2) ;
S7(T_10-2,T_10-2) ;
for (scat_3=0;scat_3<=T_10-3;scat_3++) {
S5(T_10-2,scat_3) ;
S6(T_10-2,scat_3) ;
S7(T_10-2,scat_3) ;
}
S9(T_10-2) ;
S14(T_10-2) ;
}
if (T_10 == 2) {
S4(0) ;
S5(0,0) ;
S7(0,0) ;
S9(0) ;
S14(0) ;
}
Where T_10 stands for the parameter N,
S4 stands for
d1(k,0) = fctr1/(t*(x(k)-x(0)))
fctr = -fctr1
S5 stands for "if (j.ne.k)"
S6 stands for "d1(k,j) = fctr/(x(k)-x(j))"
S7 stands for "fctr = -fctr".
S14 stands for
d1(k,N) = fctr/(t*(x(k)-x(N)))
fctr1 = -fctr1
So the error seems to be that we are splitting the index scat_3 into
two ranges that are not ordered in the same way as in the original
loop nest:
for (scat_1=1;scat_1<=T_10-3;scat_1++) {
S4(scat_1) ;
S5(scat_1,scat_1) ;
S7(scat_1,scat_1) ;
for (scat_3=scat_1+1;scat_3<=T_10-2;scat_3++) {
S5(scat_1,scat_3) ;
S6(scat_1,scat_3) ;
S7(scat_1,scat_3) ;
}
for (scat_3=0;scat_3<=scat_1-1;scat_3++) {
S5(scat_1,scat_3) ;
S6(scat_1,scat_3) ;
S7(scat_1,scat_3) ;
}
S9(scat_1) ;
S14(scat_1) ;
}
We are executing the range [scat_1+1, T_10-2] before executing the
range [0, scat_1-1].
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread* [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
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From: dominiq at lps dot ens dot fr @ 2010-03-14 11:40 UTC (permalink / raw)
To: gcc-bugs
------- Comment #24 from dominiq at lps dot ens dot fr 2010-03-14 11:40 -------
> We are executing the range [scat_1+1, T_10-2] before executing the
> range [0, scat_1-1].
This would be OK if fctr had been initialized with the right value. Failing to
do so leads to an early NAN.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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2010-03-14 11:40 ` dominiq at lps dot ens dot fr
@ 2010-03-20 10:45 ` dominiq at lps dot ens dot fr
2010-03-21 16:28 ` Sebastian Pop
2010-03-21 16:28 ` sebpop at gmail dot com
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From: dominiq at lps dot ens dot fr @ 2010-03-20 10:45 UTC (permalink / raw)
To: gcc-bugs
------- Comment #25 from dominiq at lps dot ens dot fr 2010-03-20 10:45 -------
> We are executing the range [scat_1+1, T_10-2] before executing the
> range [0, scat_1-1].
Do you understand why graphite does not detect that the loop for [scat_1+1,
T_10-2] depends on the one for [0, scat_1-1]?
Second question why does graphite exchange the order of the split loops?
Note also that in the original loop handling the loop for [0, scat_1-1] is
tricky when scat_1==1 (fctr = fctr1*fctr2 and fctr2 = -o*fctr2 must be handled
correctly).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread* Re: [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
2010-03-20 10:45 ` dominiq at lps dot ens dot fr
@ 2010-03-21 16:28 ` Sebastian Pop
0 siblings, 0 replies; 39+ messages in thread
From: Sebastian Pop @ 2010-03-21 16:28 UTC (permalink / raw)
To: gcc-bugzilla; +Cc: gcc-bugs
On Sat, Mar 20, 2010 at 05:45, dominiq at lps dot ens dot fr wrote:
> Do you understand why graphite does not detect that the loop for [scat_1+1,
> T_10-2] depends on the one for [0, scat_1-1]?
Graphite does know this, but it does not ask CLooG to generate
[0, scat_1-1] after [scat_1+1, T_10-2], however CLooG does
generate it, so I am thinking that this is a problem in CLooG.
> Second question why does graphite exchange the order of the split loops?
>
CLooG does that.
^ permalink raw reply [flat|nested] 39+ messages in thread
* [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
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@ 2010-03-21 16:28 ` sebpop at gmail dot com
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From: sebpop at gmail dot com @ 2010-03-21 16:28 UTC (permalink / raw)
To: gcc-bugs
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 705 bytes --]
------- Comment #26 from sebpop at gmail dot com 2010-03-21 16:28 -------
Subject: Re: [4.5 Regression][graphite]
-fgraphite-identity miscompiles air.f90
On Sat, Mar 20, 2010 at 05:45, dominiq at lps dot ens dot fr wrote:
> Do you understand why graphite does not detect that the loop for [scat_1+1,
> T_10-2] depends on the one for [0, scat_1-1]?
Graphite does know this, but it does not ask CLooG to generate
[0, scat_1-1] after [scat_1+1, T_10-2], however CLooG does
generate it, so I am thinking that this is a problem in CLooG.
> Second question why does graphite exchange the order of the split loops?
>
CLooG does that.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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From: spop at gcc dot gnu dot org @ 2010-03-23 20:08 UTC (permalink / raw)
To: gcc-bugs
------- Comment #27 from spop at gcc dot gnu dot org 2010-03-23 20:08 -------
I just verified that the problem is well in CLooG-PPL.
With CLooG-ISL we generate a correct code that looks like this:
for (c2=1;c2<=D.1554_10-3;c2++) {
S1(c2);
for (c4=0;c4<=c2-1;c4++) {
S2(c2,c4);
S3(c2,c4);
S4(c2,c4);
}
S2(c2,c2);
S4(c2,c2);
for (c4=c2+1;c4<=D.1554_10-2;c4++) {
S2(c2,c4);
S3(c2,c4);
S4(c2,c4);
}
S5(c2);
S6(c2);
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread* [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
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2010-03-23 20:08 ` spop at gcc dot gnu dot org
@ 2010-03-23 21:24 ` spop at gcc dot gnu dot org
2010-03-23 21:28 ` spop at gcc dot gnu dot org
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From: spop at gcc dot gnu dot org @ 2010-03-23 21:24 UTC (permalink / raw)
To: gcc-bugs
------- Comment #28 from spop at gcc dot gnu dot org 2010-03-23 21:24 -------
I fixed this problem in CLooG-PPL: the code generated with
the new version looks like the code generated by CLooG-ISL:
for (c2=1;c2<=D.1554_10-3;c2++) {
S1(c2);
for (c4=0;c4<=c2-1;c4++) {
S2(c2,c4);
S3(c2,c4);
S4(c2,c4);
}
S2(c2,c2);
S4(c2,c2);
for (c4=c2+1;c4<=D.1554_10-2;c4++) {
S2(c2,c4);
S3(c2,c4);
S4(c2,c4);
}
S5(c2);
S6(c2);
}
I will bootstrap and test the graphite branch with the modified
version of CLooG-PPL and then if everything looks good,
I will prepare a new version CLooG-PPL-0.15.9 and I will
upload it on ftp://gcc.gnu.org/pub/gcc/infrastructure/
Sebastian
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread* [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
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2010-03-23 21:24 ` spop at gcc dot gnu dot org
@ 2010-03-23 21:28 ` spop at gcc dot gnu dot org
2010-03-24 20:18 ` spop at gcc dot gnu dot org
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From: spop at gcc dot gnu dot org @ 2010-03-23 21:28 UTC (permalink / raw)
To: gcc-bugs
------- Comment #29 from spop at gcc dot gnu dot org 2010-03-23 21:27 -------
Also note that with the fix in CLooG-PPL,
gfortran -O2 -fgraphite-identity air.f90 -o air
./air
passes without error.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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` (30 preceding siblings ...)
2010-03-23 21:28 ` spop at gcc dot gnu dot org
@ 2010-03-24 20:18 ` spop at gcc dot gnu dot org
2010-03-24 21:35 ` howarth at nitro dot med dot uc dot edu
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From: spop at gcc dot gnu dot org @ 2010-03-24 20:18 UTC (permalink / raw)
To: gcc-bugs
------- Comment #30 from spop at gcc dot gnu dot org 2010-03-24 20:17 -------
Fixed.
Please use ftp://gcc.gnu.org/pub/gcc/infrastructure/cloog-ppl-0.15.9.tar.gz
--
spop at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
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` (31 preceding siblings ...)
2010-03-24 20:18 ` spop at gcc dot gnu dot org
@ 2010-03-24 21:35 ` howarth at nitro dot med dot uc dot edu
2010-03-25 17:43 ` Sebastian Pop
2010-03-25 17:44 ` sebpop at gmail dot com
2010-03-26 9:58 ` rguenther at suse dot de
34 siblings, 1 reply; 39+ messages in thread
From: howarth at nitro dot med dot uc dot edu @ 2010-03-24 21:35 UTC (permalink / raw)
To: gcc-bugs
------- Comment #31 from howarth at nitro dot med dot uc dot edu 2010-03-24 21:35 -------
(In reply to comment #30)
> Fixed.
>
> Please use ftp://gcc.gnu.org/pub/gcc/infrastructure/cloog-ppl-0.15.9.tar.gz
>
Shouldn't the required cloog-ppl version in configure be bumped from 0.15.5 to
0.15.9?
#if CLOOG_VERSION_MAJOR != 0 || CLOOG_VERSION_MINOR != 15 ||
CLOOG_VERSION_REVISION < 5
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread* Re: [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
2010-03-24 21:35 ` howarth at nitro dot med dot uc dot edu
@ 2010-03-25 17:43 ` Sebastian Pop
2010-03-26 9:58 ` Richard Guenther
0 siblings, 1 reply; 39+ messages in thread
From: Sebastian Pop @ 2010-03-25 17:43 UTC (permalink / raw)
To: gcc-bugzilla, Richard Guenther; +Cc: gcc-bugs
On Wed, Mar 24, 2010 at 16:35, howarth at nitro dot med dot uc dot edu
<gcc-bugzilla@gcc.gnu.org> wrote:
>> Fixed.
>>
>> Please use ftp://gcc.gnu.org/pub/gcc/infrastructure/cloog-ppl-0.15.9.tar.gz
>>
>
> Shouldn't the required cloog-ppl version in configure be bumped from 0.15.5 to
> 0.15.9?
>
Richi what do you think?
^ permalink raw reply [flat|nested] 39+ messages in thread
* Re: [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
2010-03-25 17:43 ` Sebastian Pop
@ 2010-03-26 9:58 ` Richard Guenther
0 siblings, 0 replies; 39+ messages in thread
From: Richard Guenther @ 2010-03-26 9:58 UTC (permalink / raw)
To: Sebastian Pop; +Cc: gcc-bugzilla, gcc-bugs
On Thu, 25 Mar 2010, Sebastian Pop wrote:
> On Wed, Mar 24, 2010 at 16:35, howarth at nitro dot med dot uc dot edu
> <gcc-bugzilla@gcc.gnu.org> wrote:
> >> Fixed.
> >>
> >> Please use ftp://gcc.gnu.org/pub/gcc/infrastructure/cloog-ppl-0.15.9.tar.gz
> >>
> >
> > Shouldn't the required cloog-ppl version in configure be bumped from 0.15.5 to
> > 0.15.9?
> >
>
> Richi what do you think?
It's a bit late for that change. You could warn at configure time if
a "broken but acceptable" version is detected, like we do for
gmp or mpfr (I don't remember which one).
Thanks,
Richard.
^ permalink raw reply [flat|nested] 39+ messages in thread
* [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
` (32 preceding siblings ...)
2010-03-24 21:35 ` howarth at nitro dot med dot uc dot edu
@ 2010-03-25 17:44 ` sebpop at gmail dot com
2010-03-26 9:58 ` rguenther at suse dot de
34 siblings, 0 replies; 39+ messages in thread
From: sebpop at gmail dot com @ 2010-03-25 17:44 UTC (permalink / raw)
To: gcc-bugs
------- Comment #32 from sebpop at gmail dot com 2010-03-25 17:43 -------
Subject: Re: [4.5 Regression][graphite]
-fgraphite-identity miscompiles air.f90
On Wed, Mar 24, 2010 at 16:35, howarth at nitro dot med dot uc dot edu
<gcc-bugzilla@gcc.gnu.org> wrote:
>> Fixed.
>>
>> Please use ftp://gcc.gnu.org/pub/gcc/infrastructure/cloog-ppl-0.15.9.tar.gz
>>
>
> Shouldn't the required cloog-ppl version in configure be bumped from 0.15.5 to
> 0.15.9?
>
Richi what do you think?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread* [Bug middle-end/42181] [4.5 Regression][graphite] -fgraphite-identity miscompiles air.f90
2009-11-26 2:53 [Bug middle-end/42181] New: -fgraphite-identity miscompiles or ICEs on air.f90 howarth at nitro dot med dot uc dot edu
` (33 preceding siblings ...)
2010-03-25 17:44 ` sebpop at gmail dot com
@ 2010-03-26 9:58 ` rguenther at suse dot de
34 siblings, 0 replies; 39+ messages in thread
From: rguenther at suse dot de @ 2010-03-26 9:58 UTC (permalink / raw)
To: gcc-bugs
------- Comment #33 from rguenther at suse dot de 2010-03-26 09:58 -------
Subject: Re: [4.5 Regression][graphite] -fgraphite-identity
miscompiles air.f90
On Thu, 25 Mar 2010, Sebastian Pop wrote:
> On Wed, Mar 24, 2010 at 16:35, howarth at nitro dot med dot uc dot edu
> <gcc-bugzilla@gcc.gnu.org> wrote:
> >> Fixed.
> >>
> >> Please use ftp://gcc.gnu.org/pub/gcc/infrastructure/cloog-ppl-0.15.9.tar.gz
> >>
> >
> > Shouldn't the required cloog-ppl version in configure be bumped from 0.15.5 to
> > 0.15.9?
> >
>
> Richi what do you think?
It's a bit late for that change. You could warn at configure time if
a "broken but acceptable" version is detected, like we do for
gmp or mpfr (I don't remember which one).
Thanks,
Richard.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42181
^ permalink raw reply [flat|nested] 39+ messages in thread