3 ms·

I see something rather different with that example, using GCC 10 on SKX with that code and program argument, bound to a core, +/- ~2%: -O2 -g: 1.07s -O3 -g: 1

by gnufx 5y ago

I see something rather different with that example, using GCC 10 on SKX with that code and program argument, bound to a core, +/- ~2%: -O2 -g: 1.07s -O3 -g: 1.17s -O3 -g -fprofile-generate/use: 0.84s (maqao cqa from https://maqao.org https://maqao.org would give comprehensive info on the generated code.) -- /* Tom, don't let me ever catch you using bubblesort again! -- Don */ — Knuth in dvips/afm2tfm.c

Ballas 5y ago
Are you also on Ryzen? I get: clang -O3 -march=native: 0.769s clang -O3 : 0.830s clang -O2 -march=native : 0.904s gcc -O2 -march=native :1.007s gcc -Os -march=native : 1.148s gcc -O3 -march=native : 1.928s gcc (GCC) 11.1.0 clang version 12.0.1 On Ryzen 3700x