[Qemu-devel] RFC: Code fetch optimisation

[J. Mayer]

Here's a small patch that allow an optimisation for code fetch, at least
for RISC CPU targets, as suggested by Fabrice Bellard.
The main idea is that a translated block is never to span over a page
boundary. As the tb_find_slow routine already gets the physical address
of the page of code to be translated, the code translator could then
fetch the code using raw host memory accesses instead of doing it
through the softmmu routines.
This patch could also be adapted to RISC CPU targets, with care for the
last instruction of a page. For now, I did implement it for alpha, arm,
mips, PowerPC and SH4.
I don't actually know if the optimsation would bring a sensible speed
gain or if it will be absolutelly marginal.

Please comment.

-- 
J. Mayer <address@hidden>
Never organized

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