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Re: [PATCH] Kill TREE_OVERFLOW during gimplification
Richard Guenther wrote:
> On Thu, Oct 16, 2008 at 3:39 PM, Paolo Bonzini <email@example.com> 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.
But VRP sets TREE_OVERFLOW in vrp_int_const_binop, doesn't it?