https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84719
Manuel Lauss <manuel.lauss at googlemail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- 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% )