https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112678
Bug ID: 112678
Summary: Massive slowdown of compilation time with PGO
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: compile-time-hog
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: fkastl at suse dot cz
CC: hubicka at gcc dot gnu.org
Target Milestone: ---
Between g:37183018134049a7 and g:af7fa3135b6b046f there is a big increase of
compilation time when compiling with profile guided optimization. Happens on
both O2 and Ofast with lto both disabled or enabled on x86_64 machines and
aarch64 machine.
Some plots that show this:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=474.110.8 (380%
slowdown)
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=589.337.8 (700%
slowdown)
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=286.407.8 (660%
slowdown)
All plots show compilation times of SPEC benchmarks.
