[patch] Improve loop array prefetch for IA-64

[Steven Bosscher]

On 6/3/06, Steven Bosscher <stevenb.gcc@gmail.com> wrote:
> > For floating point data, the latter is the only interesting case because float loads only
> > access the L2.  Thus using "lfetch" for floating point arrays will unnecessarily wipe out
> > the contents of L1.  (gcc 3.2.3 only seems to generate "lfetch", which is why I ask...)
>
> You could experiment with this for ia64 by hacking issue_prefetch_ref
> in tree-ssa-loop-prefetch.c to issue a prefetch to L2 for floating
> point types.

E.g. something like this, which is (needless to say) untested but
something you could play with.

Gr.
Steven
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