Garrett D'Amore - sun microsystems writes:
> Add inlines for i386/amd64 and sparcv9 for the following types of prefetch:
>
> void prefetch_read_many(void *)
>
> This requests data be loaded into a cache for repeated reading. (This
> equates to a 't0' prefetch on x86 CPUs).
>
> void prefetch_read_once(void *)
>
> This requests data be loaded into a cache for one read only, so it can
> be flushed from the cache immediately after access. (This equates to a
> 'nta' prefetch on x86 CPUs).
Are there SPARC equivalents? Have you considered other CPUs?
On PPC, there are four related instructions that I know about:
dcbt - data cache block touch
dcbtst - data cache block touch for store
dcbz - data cache block set to zero
dcbf - data cache block flush
The first of those sounds like prefetch_read_many(). The others seem
not to match up ... but *perhaps* they're rare enough (buried within
bcopy and bzero) that nobody cares ... ?
--
James Carlson, Solaris Networking <james.d.carlson at sun.com>
Sun Microsystems / 35 Network Drive 71.232W Vox +1 781 442 2084
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