Re: Serious SPEC CPU 2006 FP performance regressions on IA32

[Grigory Zagorodnev]

Meissner, Michael wrote:
437.leslie3d    -26%
it was felt that the PPRE patches that were added on November 13th were
the cause of the slowdown:
http://gcc.gnu.org/ml/gcc/2006-12/msg00023.html
Has anybody tried doing a run with just ppre disabled?


Right. PPRE appears to be the reason of slowdown.

-fno-tree-pre gets performance of cpu2006/437.leslie3d back to normal.
This is the worst case. And that will take much longer to verify whole 
set of cpu2006 benchmarks.

- Grigory