https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109971
Kewen Lin <linkw at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|testsuite-fail |missed-optimization
Assignee|linkw at gcc dot gnu.org |juzhe.zhong at rivai
dot ai
--- Comment #8 from Kewen Lin <linkw at gcc dot gnu.org> ---
I did SPEC2017 int/fp evaluation on Power10 at Ofast and an extra explicit
--param=vect-partial-vector-usage=2 (the default is 1 on Power), baseline
r14-1241 vs. new r14-1242, the results showed that it can offer some speedups
for 500.perlbench_r 1.12%, 525.x264_r 1.96%, 544.nab_r 1.91%, 549.fotonik3d_r
1.25%, but it degraded 510.parest_r by 5.01%.
I just tested Juzhe's new proposed fix which makes the loop closing iv SCEV-ed,
it can fix the degradation of 510.parest_r, also the miss optimization on
cunroll (in #c5), the test failures are gone as well. One SPEC2017
re-evaluation with that fix is ongoing, I'd expect it won't degrade anything.
