https://sourceware.org/bugzilla/show_bug.cgi?id=22871
--- Comment #19 from Linus Torvalds <torva...@linux-foundation.org> --- (In reply to Linus Torvalds from comment #18) > > Very interesting. I can confirm that testb seems slower on Skylake too. Oh no, I take that back. There's something else going on. Sometimes I get results like this: ./test testb : 98279608 testw : 987334300 testl : 101367392 testq : 100247139 and then those are stable for a while. I think there may be some random instruction queue issues going on too. Doing another loop around the benchmark, I get: Round 0 testb : 24604514 testw : 24822594 testl : 25159723 testq : 25236629 Round 1 testb : 24582167 testw : 26043817 testl : 24716638 testq : 23855638 Round 2 testb : 26776404 testw : 25030268 testl : 24753978 testq : 24595795 Round 3 testb : 23413229 testw : 26248700 testl : 25172790 testq : 24017507 so the numbers simply fluctuate a lot. Using -O2 and making the LOOP count 10x bigger, I get Round 0 testb : 149632125 testw : 149115753 testl : 148144016 testq : 148172064 Round 1 testb : 147595062 testw : 145581017 testl : 146435807 testq : 147235969 Round 2 testb : 146678329 testw : 147896478 testl : 145252248 testq : 147045806 Round 3 testb : 147764220 testw : 150151744 testl : 151424862 testq : 149017052 so it's all really just odd noise. Don't ask me what's going on, but I don't think it's that 'testb' is slower. -- You are receiving this mail because: You are on the CC list for the bug. _______________________________________________ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
