https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84719
Manuel Lauss <manuel.lauss at googlemail dot com> changed:
What |Removed |Added
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CC| |manuel.lauss at googlemail dot
com
--- Comment #12 from Manuel Lauss <manuel.lauss at googlemail dot com> ---
clang-7 achieves an impressive level of ipc (amd zen):
Performance counter stats for './memtime-clangO2' (10 runs):
358,260795 task-clock:u (msec) # 0,999 CPUs utilized
( +- 1,43% )
0 context-switches:u # 0,000 K/sec
0 cpu-migrations:u # 0,000 K/sec
244.191 page-faults:u # 0,682 M/sec
( +- 0,00% )
1.253.573.425 cycles:u # 3,499 GHz
( +- 1,50% )
149.207.036 stalled-cycles-frontend:u # 11,90% frontend cycles
idle ( +- 2,04% )
333.373.414 stalled-cycles-backend:u # 26,59% backend cycles
idle ( +- 0,00% )
4.333.767.562 instructions:u # 3,46 insn per cycle
# 0,08 stalled cycles per
insn ( +- 0,00% )
333.621.304 branches:u # 931,225 M/sec
( +- 0,00% )
248.011 branch-misses:u # 0,07% of all branches
( +- 0,06% )
0,358644336 seconds time elapsed
( +- 1,43% )
compared to gcc-8 as of today:
Performance counter stats for './memtime-gcc8O2' (10 runs):
2087,357431 task-clock:u (msec) # 1,000 CPUs utilized
( +- 0,19% )
0 context-switches:u # 0,000 K/sec
0 cpu-migrations:u # 0,000 K/sec
244.191 page-faults:u # 0,117 M/sec
( +- 0,00% )
8.273.911.027 cycles:u # 3,964 GHz
( +- 0,00% )
3.691.281.142 stalled-cycles-frontend:u # 44,61% frontend cycles
idle ( +- 0,02% )
333.373.414 stalled-cycles-backend:u # 4,03% backend cycles
idle ( +- 0,00% )
3.667.101.412 instructions:u # 0,44 insn per cycle
# 1,01 stalled cycles per
insn ( +- 0,00% )
333.621.824 branches:u # 159,830 M/sec
( +- 0,00% )
248.423 branch-misses:u # 0,07% of all branches
( +- 0,01% )
2,088370519 seconds time elapsed
( +- 0,19% )
