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Re: [PATCH] Kill TREE_OVERFLOW during gimplification


> 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;

And as a reminder to myself, it's time for
s/TREE_CONSTANT_OVERFLOW/TREE_OVERFLOW/.

Paolo


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