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Re: A Bug of gfortran, g77 and g95 on default optimization
- From: Tobias Burnus <burnus at net-b dot de>
- To: Sunjoong Lee <sunjoong at gmail dot com>
- Cc: fortran at gcc dot gnu dot org
- Date: Mon, 18 Jun 2007 16:03:41 +0200
- Subject: Re: A Bug of gfortran, g77 and g95 on default optimization
- References: <963c45680706180629q390ff8d9q461bd08febd8874e@mail.gmail.com> <963c45680706180637v5e3bc18co54005f7c1d201e5a@mail.gmail.com>
Sunjoong Lee wrote:
> I had compiled a legacy fortran77 code and foud a bug;
> $ gfortran -o TMalign TMalign.f
> $ ./TMalign 1aquA.pdb 1avaC.pdb | grep ^Ali
> Aligned length= 89, RMSD= 6.41, TM-score= 0.24257, ID=0.042
> $ gfortran -O0 -o TMalign TMalign.f
> $ ./TMalign 1aquA.pdb 1avaC.pdb | grep ^Ali
> Aligned length= 91, RMSD= 6.35, TM-score=0.24762 , ID=0.024
I find this difference very odd as "-O0" is the default optimization for
gfortran. Other than that I get always the same result ("91") with all
-O levels I tried with gfortran 4.3, 4.2.0, 4.1.3 and ifort.
Which version of the compiler are you using on which platform. (Use
"gfortran -v" to shows this information.)
Can you also show what "alias gfortran" (or "type gfortran") shows? Just
to make sure there is no alias which adds options.
Tobias