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Re: [PATCH] Kill TREE_OVERFLOW during gimplification
On Thu, Oct 16, 2008 at 3:39 PM, Paolo Bonzini <bonzini@gnu.org> wrote:
>
>> As TREE_OVERFLOW happens to be an optimization
>> barrier in many cases, this helps getting rid of missed optimizations.
>> Still, any folding during gimple passes that doesn't go through gimplifier
>> on the result may introduce again TREE_OVERFLOW constants, but this at least
>> decreases their number. Bootstrapped/regtested on x86_64-linux, during
>> make check this triggered 1355 times.
>
> You can also try changing all the occurrences of
>
> TREE_OVERFLOW (t) = 1;
>
> in fold-const.c into
>
> TREE_OVERFLOW (t) = in_gimple_form;
This will very likely break at least VRP.
Richard.
> And as a reminder to myself, it's time for
> s/TREE_CONSTANT_OVERFLOW/TREE_OVERFLOW/.
>
> Paolo
>