RFA: loop optimization bug

Dale Johannesen dalej@apple.com
Wed Jul 27 17:09:00 GMT 2005


On Jul 27, 2005, at 1:58 AM, Zdenek Dvorak wrote:
>
> tree optimizers in general do not care about order of blocks.  I have
> some patch to change this (more or less only to improve readability of
> dumps), I don't know whether it would help this particular case or
> not.

I actually don't think the tree opts should care.  You've got a CFG and
all these spiffy graph-based algorithms, why not use them?   The problem
as I see it is that the (old) RTL loop opt does care.  If that's 
unavoidable,
IMO a better approach would be to force the blocks into some canonical
order somewhere between RTL conversion and the loop optimizer.



More information about the Gcc-patches mailing list