[petsc-dev] Generality of VecScatter

[Jed Brown]

On Tue, Nov 29, 2011 at 12:40, Barry Smith <bsmith at mcs.anl.gov> wrote:

>  The very first google hit for "pause instruction spin loop"


This is documentation for the first chip to use it. They are asserting that
it does not cause illegal-opcode exceptions for prior chips, so it is valid
to use unconditionally, even in software that needs to run on older chips.
I think this is clear from context (certainly if you had been reading the
documented instead of skipping to the end), but it could have been more
explicit.
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