Messages in this thread |  | | From | mharris@ican ... | Date | Fri, 12 Dec 1997 13:02:19 -0500 (EST) | Subject | Re: copy-bit macro |
| |
On 11 Dec 1997, Stefan Monnier wrote:
> Date: 11 Dec 1997 17:59:10 -0500 > From: Stefan Monnier <monnier+lists/linux/kernel/news/@TEQUILA.SYSTEMSZ.CS.YALE.EDU> > To: linux-kernel@vger.rutgers.edu > Newsgroups: lists.linux.kernel > Subject: Re: copy-bit macro > > "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).
386/486 processors have branch prediction?
Mike A. Harris | Homepage: http://blackwidow.saultc.on.ca/~mharris Computer Consultant | System/Network Administrator - John Howard Society, Sault Ste. Marie, Ont. Mark should get a sound card and more ISA slots!!!!!!!! ;o)
|  |