https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96825
Bug ID: 96825
Summary: Commit r11-2645 degrades CPU2017 548.exchange2_r by
35%
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: pthaugen at gcc dot gnu.org
CC: bergner at gcc dot gnu.org, hubicka at gcc dot gnu.org,
segher at gcc dot gnu.org, seurer at gcc dot gnu.org,
wschmidt at gcc dot gnu.org
Target Milestone: ---
Host: powerpc64-unknown-linux-gnu
Target: powerpc64-unknown-linux-gnu
Build: powerpc64-unknown-linux-gnu
The given commit (1118a3ff9d3ad6a64bba25dc01e7703325e23d92) causes a 35%
degradation for exchange2_r on Power9 built with the options "-O2
-mcpu=power9". Switching to -O3 results in a 44% degradation. The degradation
occurs in __brute_force_MOD_digits_2().
