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Re: Fix twolf -funroll-loops -O3 miscompilation (a semi-latent web.c bug)
Il 13/10/2012 00:25, Steven Bosscher ha scritto:
> On Fri, Oct 12, 2012 at 11:16 PM, Jan Hubicka <hubicka@ucw.cz> wrote:
>>> On Fri, Oct 12, 2012 at 10:44 PM, Jan Hubicka <hubicka@ucw.cz> wrote:
>>>> 1) computing liveness with REG_EQUAL included prior RD that means a lot
>>>> of shuffling of REG_DEAD notes
>>>
>>> I was already working on a patch for this. I'll send it here later tonight.
>>
>> Great, thanks! This is probably most sensible approach even if we will need to
>> recompute liveness before/after webizer.
>
> I don't think we have to touch the liveness sets. We can compute an
> extra set of registers live only for REG_EQUAL/REG_EQUIV notes.
> Attached is what I had in mind. Untested, etc. it's late (and the
> Yankees are playing) so I'll get back to properly testing this
> tomorrow.
Can we just simulate liveness for web, and drop REG_EQUAL/REG_EQUIV
notes that refer to a dead pseudo?
Paolo