[Mono-dev] [PATCH] Optimize Mono.Simd non-accelerated bitwise-ops

Cedric Vivier cedricv at neonux.com
Mon Nov 10 00:50:07 EST 2008

Hi Rodrigo,

While playing with Mono.Simd on a (for now ;( ) non-accelerated x86-64
setup [1], I've
noticed that performance of bitwise-ops on Vector16b and others could
be improved.

This patch implements these ops as two 64-bit bitwise ops [2] instead
of processing
each vector element separately. Giving up to 4X perf increase for
Vector16(s)b and 2X for others.

Please review,

1: any plans about enabling acceleration on x86-64 soon?

2: using two ulong obviously gives the best perf on x86-64, I have no
32-bit setup handy
to test if it would give significantly better perf using four uint
instead on them (at the expense of 64-bit platforms though if it
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