[Bug middle-end/66253] New: [6 Regression] 459.GemsFDTD in SPEC CPU 2006 is miscompiled

[Bug middle-end/66253] New: [6 Regression] 459.GemsFDTD in SPEC CPU 2006 is miscompiled

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66253

            Bug ID: 66253
           Summary: [6 Regression] 459.GemsFDTD in SPEC CPU 2006 is
                    miscompiled
           Product: gcc
           Version: 5.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

On Linux/x86-64, 459.GemsFDTD in SPEC CPU 2006 is miscompiled:

gfortran  -O3 -funroll-loops -ffast-math   -DSPEC_CPU_LP64        errorcheck.o
parameter.o globalvar.o excite.o fourier_transf.o huygens.fppized.o posvector.o
NFT.fppized.o readline.o PEC.o UPML.fppized.o calcflops.o progress.o
update.fppized.o leapfrog.o readdata.o GemsFDTD.o timerRoutine.o               
     -o GemsFDTD

Running Benchmarks
  Running 459.GemsFDTD ref peak lnx32e-gcc default

*** Miscompare of sphere_td.nft; for details see

r223425 is OK and r223491 is bad.

[Bug middle-end/66253] [6 Regression] 459.GemsFDTD in SPEC CPU 2006 is miscompiled

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66253

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-05-22
            Version|5.1.1                       |6.0
   Target Milestone|---                         |6.0
     Ever confirmed|0                           |1

[Bug middle-end/66253] [6 Regression] 459.GemsFDTD in SPEC CPU 2006 is miscompiled

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66253

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |matz at gcc dot gnu.org

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Probably related to PR66251 aka strided store support.

[Bug middle-end/66253] [6 Regression] 459.GemsFDTD in SPEC CPU 2006 is miscompiled

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66253

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Richard Biener from comment #1)
> Probably related to PR66251 aka strided store support.

It is caused by r223486.

[Bug middle-end/66253] [6 Regression] 459.GemsFDTD in SPEC CPU 2006 is miscompiled

[matz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66253

--- Comment #3 from Michael Matz <matz at gcc dot gnu.org> ---
Can you check if the patch at
  https://gcc.gnu.org/ml/gcc-patches/2015-05/msg02133.html
helps also gemsfdtd?

[Bug middle-end/66253] [6 Regression] 459.GemsFDTD in SPEC CPU 2006 is miscompiled

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66253

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Michael Matz from comment #3)
> Can you check if the patch at
>   https://gcc.gnu.org/ml/gcc-patches/2015-05/msg02133.html
> helps also gemsfdtd?

I tried and I still got

Running Benchmarks
  Running 459.GemsFDTD ref peak lnx32e-gcc default

*** Miscompare of sphere_td.nft; for details see

[Bug middle-end/66253] [6 Regression] 459.GemsFDTD in SPEC CPU 2006 is miscompiled

[matz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66253

--- Comment #5 from Michael Matz <matz at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #4)
> I tried and I still got
> 
> Running Benchmarks
>   Running 459.GemsFDTD ref peak lnx32e-gcc default
> 
> *** Miscompare of sphere_td.nft; for details see

Hmpf, okay need to analyze it myself then :-/

[Bug middle-end/66253] [6 Regression] 459.GemsFDTD in SPEC CPU 2006 is miscompiled

[matz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66253

Michael Matz <matz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |matz at gcc dot gnu.org

--- Comment #6 from Michael Matz <matz at gcc dot gnu.org> ---
hence, mine

[Bug middle-end/66253] [6 Regression] 459.GemsFDTD in SPEC CPU 2006 is miscompiled

[matz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66253

Michael Matz <matz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #7 from Michael Matz <matz at gcc dot gnu.org> ---
miscompilation must be somewhere in NFT.fppized.

[Bug middle-end/66253] [6 Regression] 459.GemsFDTD in SPEC CPU 2006 is miscompiled

[matz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66253

Michael Matz <matz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #9 from Michael Matz <matz at gcc dot gnu.org> ---
This fixed it indeed on our spec testers at http://gcc.opensuse.org/.