PR19039 causes regression of 3.9% in SPEC int

[Roger Sayle]

On Fri, 24 Dec 2004, Mostafa Hagog wrote:
> Performing the loop-header-copying is a sort of "work around" to this PR,
> I have ported the loop-header-copying from tree's to RTL.  This caused a
> total 3.9% improvements with the rtl loop header copying (lhc).

That's PR tree-optimization/19038, *not* PR target/19039.

Would you mind posting your RTL-based loop header copying patch to
gcc-patches?  Not only might it be catching more optimizations than
out-of-ssa is causing, but as a solution it might be more suitable
for gcc 4.0 (depending upon compile-time performance impact, ugliness,
intrusivenss, corrections to Andrew's "quick fix", etc...).

Very impressive performance numbers though.
Thanks in advance,

Roger
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