Am 16.06.2015 um 13:41 schrieb Alexey Dobriyan: >> Now strlen() increments a variable for each character it faces, >> hence it will consume more cycles. > > It doesn't matter if there is a dependency in a loop: > > Before: > 520: 48 83 c0 01 add $0x1,%rax > 524: 80 38 00 cmpb $0x0,(%rax) > 527: 75 f7 jne 520 > > After: > 500: 48 83 c0 01 add $0x1,%rax > 504: 80 3c 07 00 cmpb $0x0,(%rdi,%rax,1) > 508: 75 f6 jne 500 >
Hmmm. Thanks for pointing this out! Thanks, //richard -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
