> 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.
If -fno-tree-pre disables PPRE, then it doesn't change much (4.3 relative to 4.2 with -O2): CPU2006 -O2 -O2 -fno-tree-pre 410.bwaves -6% -8% 416.gamess 433.milc 434.zeusmp 435.gromacs 436.cactusADM 437.leslie3d -26% -27% 444.namd 447.dealII 450.soplex 453.povray 454.calculix 459.GemsFDTD -12% -12% 465.tonto 470.lbm 481.wrf 482.sphinx3 Is PPRE enabled at -O2 at all? I couldn't confirm that from the original patches, which enabled PPRE only at -O3. -- _______________________________________________________ Evandro Menezes AMD Austin, TX