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Re: [RFA] expand from SSA form (1/2)
Hi,
On Mon, 27 Apr 2009, Luis Machado wrote:
> Speaking about powerpc, i've tracked down a 19% degradation on cpu2000's
> 32-bit sixtrack and found that revision 146817 caused/revealed it.
>
> I'll have more details on it soon.
It seems also x86_64 is affected, so anything you find is very welcome.
If I may speculate it could be related to the half TER we're now doing.
As in, we're not feeding large trees to expand anymore, so there're no
opportunities to cleverly expand them to short insn sequences. For
cross-checking try to build with -fno-tree-ter (before the patch) and see
if it's resulting in the same slowdown.
Ciao,
Michael.