There is no defensible reason why SIMD code should be harder to write than scalar code. GLSL has been around since 2004 and in GLSL it’s easier to write vector code than scalar code.
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This is somewhat tongue in cheek, but, like, Intel made the move to 256-bit and actually got very little uptake, outside of stuff like memcpy implementations. 128 bit seems to be a sweet spot!
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You may want to look at AVX512 which adds a lot of major functionality to "do vectorisation right".
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I agree. CPUs went wide, trying and failing to compete with GPUs, as if wider is always better. They should have fixed their short vec stories, first. Add fast vec3, vec4 instructions for dot, cross, etc. Offer libraries for everything to above, instead of specialized compilers.
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I think I was getting better performance with my AVX backend compared to the SSE one, but I should look again...
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