https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115438
Bug ID: 115438
Summary: 503.bwaves_r regressed 5-11% on different x86_64
machines at -Ofast -march=native since
r15-1006-gd93353e6423eca
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: jamborm at gcc dot gnu.org
CC: rguenth at gcc dot gnu.org
Blocks: 26163
Target Milestone: ---
The run-tie of 503.bwaves_r from SPEC INTrate 2017 regressed by 5-11%
on different x86_64 machines at -Ofast -march=native (specifically
without LTO) since r15-1006-gd93353e6423eca (Richard Biener: Do
single-lane SLP discovery for reductions). I have bisected the issue
on zen3, the other regressions however appeared around the same time:
- zen3: 11% https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=471.427.0
- zen2: 7% https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=295.427.0
- skylake: 5%
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=801.427.0
- zen4: 5% https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=970.427.0
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
[Bug 26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)
