--- Comment #9 from rguenth at gcc dot gnu dot org 2008-08-22 15:02 ---
*** Bug 36983 has been marked as a duplicate of this bug. ***
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rguenth at gcc dot gnu dot org changed:
What|Removed |Added
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--- Comment #8 from hjl dot tools at gmail dot com 2008-03-06 22:03 ---
This is a known issue with mgrid. The absolute tolerance is too
small. After increasing absolute tolerance from 1.0e-12 to
1.0e-11, the miscomparison is gone.
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hjl dot tools at gmail dot com changed:
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fxcoudert at gcc dot gnu dot org changed:
What|Removed |Added
CC||fxcoudert at gcc dot gnu dot
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--- Comment #7 from rguenth at gcc dot gnu dot org 2008-03-02 11:00 ---
Note the COND_EXRPs will be lowered to control-flow while the MAX_EXPRs will
retain a single BB. Still, on i686 the exactly same inner loop IL is created.
And btw I don't see mgrid miscomparing on our tester that r
--- Comment #6 from rguenth at gcc dot gnu dot org 2008-03-02 10:31 ---
The foldings look legit. I wonder in which dump there starts to be a real
difference? I suppose maybe the vectorizer now can do work if not faced with
a COND_EXPR.
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rguenth at gcc dot gnu dot org changed:
--- Comment #5 from kargl at gcc dot gnu dot org 2008-03-02 01:33 ---
(In reply to comment #4)
> I got
>
> Running 172.mgrid ref base o2 default
> *** Miscompare of mgrid.out, see
> /export/gnu/import/rrs/spec/2000/spec/benchspec
> /CFP2000/172.mgrid/run/0002/mgrid.out.mis
> Inval
--- Comment #4 from hjl dot tools at gmail dot com 2008-03-02 01:11 ---
I got
Running 172.mgrid ref base o2 default
*** Miscompare of mgrid.out, see
/export/gnu/import/rrs/spec/2000/spec/benchspec
/CFP2000/172.mgrid/run/0002/mgrid.out.mis
Invalid run; unable to continue. If you w
--- Comment #3 from tobi at gcc dot gnu dot org 2008-03-01 23:15 ---
I checked the code leading up to this, and if I didn't miss a codepath, stride
will always be of type gfc_array_index_type, so I'm inclined to believe that
the bug, if any, is in fold. It is of course possible that fol
--- Comment #2 from kargl at gcc dot gnu dot org 2008-03-01 22:59 ---
Define "miscompiles"?
Remove -ffast-math?
Add -fbounds-check?
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35418
--- Comment #1 from hjl dot tools at gmail dot com 2008-03-01 22:50 ---
The code looks like
SUBROUTINE RESID(U,V,R,N,A)
INTEGER N
REAL*8 U(N,N,N),V(N,N,N),R(N,N,N),A(0:3)
INTEGER I3, I2, I1
DO 600 I3=2,N-1
DO 600 I2=2,N-1
DO 600 I1=2,N-1
N is
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