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Re: [PATCH] PR fortran/31593: Speed up loops with DO variables as procedure arguments

From: Tobias Schlüter <Tobias dot Schlueter at physik dot uni-muenchen dot de>
To: Dominique Dhumieres <dominiq at lps dot ens dot fr>
Cc: fortran at gcc dot gnu dot org
Date: Tue, 25 Aug 2009 12:52:57 +0200
Subject: Re: [PATCH] PR fortran/31593: Speed up loops with DO variables as procedure arguments
References: <20090825103200.942FD3BE85@mailhost.lps.ens.fr>

Hi Dominique,

Dominique Dhumieres wrote:

I have tested your patch on the polyhedron suite and have found
a slowdown (~15%) on the air.f90 test. As far as I can tell, it
is another incarnation of pr40106: a significant increase of the
call to pow:

I assume the slowdown happens only with -fwhole-file? I didn't use that option in my benchmarks which is why I didn't see it. I did see lots of weird collateral damage with other speedup patches that I tried.

I'm not sure how to deal with this.

Cheers,
- Tobi

--
Tobias Schlüter
Am Coulombwall 1, Zi. 326
85748 Garching b. München
Tel.: +49/89/289-14139

References:
- Re: [PATCH] PR fortran/31593: Speed up loops with DO variables as procedure arguments
  - From: Dominique Dhumieres

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