https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80838
--- Comment #3 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
bootstrap-lto/PGO:
Performance counter stats for 'g++ -Ofast -w tramp3d-v4.cpp' (10 runs):
16381.906087 task-clock (msec) # 0.998 CPUs utilized
( +- 0.32% )
1,408 context-switches # 0.086
K/sec ( +- 0.31% )
6 cpu-migrations # 0.000 K/sec
( +- 3.45% )
270,871 page-faults # 0.017 M/sec
63,434,476,091 cycles # 3.872 GHz
( +- 0.27% )
13,204,293,203 stalled-cycles-frontend # 20.82% frontend cycles
idle ( +- 0.25% )
13,046,634,059 stalled-cycles-backend # 20.57% backend cycles
idle ( +- 0.03% )
76,669,663,652 instructions # 1.21 insn per cycle
# 0.17 stalled cycles per
insn ( +- 0.03% )
16,930,988,799 branches # 1033.518 M/sec
( +- 0.03% )
619,469,535 branch-misses # 3.66% of all branches
( +- 0.16% )
16.408429260 seconds time elapsed
( +- 0.31% )
pure PGO:
Performance counter stats for 'g++ -Ofast -w tramp3d-v4.cpp' (10 runs):
15688.921067 task-clock (msec) # 0.998 CPUs utilized
( +- 0.11% )
1,345 context-switches # 0.086 K/sec
( +- 0.10% )
6 cpu-migrations # 0.000 K/sec
( +- 6.72% )
269,717 page-faults # 0.017 M/sec
60,747,706,165 cycles # 3.872 GHz
( +- 0.08% )
13,442,559,819 stalled-cycles-frontend # 22.13% frontend cycles
idle ( +- 0.14% )
12,919,375,998 stalled-cycles-backend # 21.27% backend cycles
idle ( +- 0.02% ) (83.31%)
73,128,792,903 instructions # 1.20 insn per cycle
# 0.18 stalled cycles per
insn ( +- 0.02% )
16,607,093,842 branches # 1058.524 M/sec
( +- 0.02% )
617,220,915 branch-misses # 3.72% of all branches
( +- 0.17% )
15.718059194 seconds time elapsed
( +- 0.11% )
