perf(linalg): run SiLU through the fused FMA kernel on AVX-512 hosts - #2567
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perf(linalg): run SiLU through the fused FMA kernel on AVX-512 hosts#2567cverrier wants to merge 2 commits into
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x86 hosts with AVX2+FMA but no AVX-512 ran SiLU through the generic scalar kernel; they now get a vectorized one, which improves the throughput. Accuracy follows the FMA sigmoid.
AVX-512 hosts ran silu_f32 and silu_f16 through a kernel composed over the zmm sigmoid, which pays a scratch copy and an extra traversal that the fused FMA kernel avoids. They now use the fused kernel at both widths. The composed kernel has no remaining users, and is removed.
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