Re: GIMPLE / induction variable analysis

[Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>]

Hello,

> I'm looking for an induction variable analysis which will operate at the 
> GIMPLE level. So far, I've found...
> 
> loop-iv.c -- RTL induction variable analysis
> tree-ssa-loop-ivopts.c -- GIMPLE induction variable analysis

no, tree-level induction variable analysis is in
tree-scalar-evolution.c.  What you are looking for most likely is
simple_iv function (or if you are adventurous and want to handle
non-affine induction variables or evolutions in several loops at once
as well, analyze_scalar_evolution and instantiate_parameters functions).

Zdenek

> The latter appears to be the right choice but nearly all of the 
> functions - and certainly the key data structures - are placed in the .c 
> file, hidden away from the outside world.
> 
> Is there a reason that this interface hasn't been exposed in a header 
> file? I can certainly duplicate the interface into a header - for 
> private development purposes - but if there's a good reason not do this, 
>  is there a better approach?
> 
> Thanks,
> 
> -- 
> Jay L.T. Cornwall, http://www.esuna.co.uk/~jay/
> PhD Student
> Imperial College London