[LLVMdev] ISel Pattern Preferences

[someguy]

David,
Would you mind documenting what you did with AddedComplexity for the 'less
fortunate' on the wiki?

Thanks,
Justin.

On Mon, Apr 6, 2009 at 9:47 PM, David Greene <dag at cray.com> wrote:

> On Monday 06 April 2009 13:31, David Greene wrote:
> > What's a reliable way to prefer one patterns over another?  I have two
> > patterns with different predicates.  Pattern A has a very general
> predicate
> > to catch a wide variety of store instructions.  Pattern B has a narrower
> > predicate meant to catch very specific store instructions that would also
> > satisfy the predicate for Pattern A.
> >
> > We used to match Pattern B just fine but after changing .td files a bit
> the
> > selector is always picking Pattern A.
> >
> > Setting AddedComplexity doesn't seem to help.
>
> Urk.  I set AddedComplexity on the wrong thing.  Seems to work now.
>
>                                                -Dave
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