Benchmark memchar (with GCC builtins)

[Dmitry Olshansky via Digitalmars-d]

On 31-Oct-2015 00:29, Iakh wrote:
> I continue to play with SIMD. So I was trying to use std.simd
> But it has lots of thing to be implemented. And I also gave up with
>   core.simd.__simd due to problems with PMOVMSKB instruction (it is not
> implemented).
>
> Today I was playing with memchr for gdc:
> memchr: http://www.cplusplus.com/reference/cstring/memchr/
> My implementations with benchmark:
> http://dpaste.dzfl.pl/4c46c0cf340c
>
> Benchmark results:
> -----
> Naive:        21.9     TickDuration(136456491)
> SIMD:         3.04     TickDuration(18920182)
> SIMDM:        2.44     TickDuration(15232176)
> SIMDU:         1.8     TickDuration(11210454)
> C:               1     TickDuration(6233963)
>

More or less matches my experience with C's memchr vs something else - 
it's fastest portable solution to find a byte in a chunk of memory.

-- 
Dmitry Olshansky