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Re: [Fortran] Improved dependency analysis of pointer variables
- From: Tobias Schlüter <Tobias dot Schlueter at Physik dot Uni-Muenchen dot DE>
- To: Tobias Schlüter <Tobias dot Schlueter at Physik dot Uni-Muenchen dot DE>
- Cc: Roger Sayle <roger at eyesopen dot com>, Paul Brook <paul at codesourcery dot com>, gcc-patches at gcc dot gnu dot org, FX Coudert <fxcoudert at gmail dot com>, fortran at gcc dot gnu dot org
- Date: Thu, 16 Mar 2006 16:45:22 +0100
- Subject: Re: [Fortran] Improved dependency analysis of pointer variables
- References: <Pine.LNX.4.44.0603160816160.10705-100000@www.eyesopen.com> <1142523781.4419878524309@www.cip.physik.uni-muenchen.de>
Quoting Tobias Schlüter <Tobias.Schlueter@Physik.Uni-Muenchen.DE>:
> I marveled at that line earlier myself. I think it's wrong. If offset is
> the
> number of storage units / bytes / whatever that the object is into the common
> block, then the inequality would not be correct for a dependency where the
> stride is negative (i.e. a(5:1:-1)), so I think the right course of action is
> to remove that check, and only do smart stuff if there are no equivalences
> involved.
Forgot to say: if we decide to keep it, the comment in front of the function
should be enhanced, I couldn't tell from it which argument represents the
source, and which the destination.
- Tobi