On 6 March 2013 16:18, Paolo Bonzini <pbonz...@redhat.com> wrote: > Il 06/03/2013 04:47, Peter Maydell ha scritto: >> I think my opinions are still the same -- interesting idea, but getting >> it to work with a set of IR ops which aren't target or host specific >> and getting it to give correct bit-for-bit results, rounding, flags, >> etc, is likely to be tricky. It would also be important to determine >> first whether Neon (or other SIMD) emulation performance is truly >> a major bottleneck. > > SSE operations, while not a bottleneck, are the top helpers in the > profile when booting Linux on x86. > > Using common code to generate the simplest unrolled SIMD operations > (logical operations, add, subtract, compare to zero) would already help > a lot, I think.
Yeah, I don't mean to say it's a bad idea, just that there's a long distance between a neat tech demo/research paper and productised code that can be committed to mainline :-) -- PMM
