Messages in this thread | | | Date | Tue, 24 Dec 2002 10:51:11 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: Intel P6 vs P7 system call performance |
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On Tue, 24 Dec 2002, Rogier Wolff wrote: > > Ehmm, Linus, > > Why do you want to align the return point? Why are jump-targets aligned? > Because they are faster. But why are they faster? Because the > cache-line fill is more efficient: the CPU might execute those > instructions, while it has a smaller chance of hitting the instructions > before the target.
Actually, no. Many CPU's apparently also have issues with instruction decoding etc, where certain alignments (4 or 8-byte aligned) are better simply because they feed the decode logic more efficiently.
Everything here fits in one cache-line, so clearly the cacheline issues don't matter.
Linus
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