Re: copy-bit macro
Stefan Monnier (monnier+lists/linux/kernel/news/@TEQUILA.SYSTEMSZ.CS.YALE.EDU)
11 Dec 1997 17:59:10 -0500
"Theodore Y. Ts'o" <tytso@MIT.EDU> writes:
> (1 << OUT_FLAG_NUMBER) : 0") both involve an assembly language
> conditional jump instruction, which is expensive, because it involves
> pipeline stalls, etc.
Has it been measured ? I know that branch prediction is not 100%, but
I'm just trying to make sure we're not trying to solve a non-problem (if the
prediction works well, then the jump costs 0 (zero) cycles).
Stefan