Use a more aggressive approach to unrolling in simd_gemm
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For most architectures the compiler unrolls the main GEMM loop as requested. For AVX-512 however it didn't. To fix this, swap out the unroll macro for one which uses a more aggressive method to force unrolling: duplicating the body 4x. See https://gist.github.com/robertknight/948170d4edb048804105a99cb4831b4b for a before/after comparison.
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For most architectures the compiler unrolls the main GEMM loop as requested. For AVX-512 however it didn't. To fix this, swap out the unroll macro for one which uses a more aggressive method to force unrolling.
See https://gist.github.com/robertknight/948170d4edb048804105a99cb4831b4b for a before/after comparison of the assembly.