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Re: Reload bug & SRA oddness
On May 9, 2007, Bernd Schmidt <bernds_cb1@t-online.de> wrote:
>> - only assignments to BIT_FIELD_REFs are regarded as both input and
>> output now; the use_all machinery is restored
> Sounds like there's room for improvement. Do you think it would be hard
> to solve this accurately?
I'm not sure what kind of improvement you have in mind. Are you
talking about not doing the in/out at all and breaking up the
BIT_FIELD_REF such that it affects the scalarized variables? Or about
doing the in/out only on the fields covered by the BIT_FIELD_REF? Or
something else?
> Is the cost logic in decide_block_copy still correct after this patch?
> It seems like it could be unnecessarily pessimistic.
That's possible. I haven't paid too much attention to that yet. I'm
still busy trying to get it to generate correct code for all targets
;-/
--
Alexandre Oliva http://www.lsd.ic.unicamp.br/~oliva/
FSF Latin America Board Member http://www.fsfla.org/
Red Hat Compiler Engineer aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist oliva@{lsd.ic.unicamp.br, gnu.org}