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Recover performance of non-hardware assisted SBGEMM - #6223
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#5373 had replaced the local bfloat16-to-float conversion with a call to our sbf16tos BLAS extension in a different translation unit, reducing performance on Haswell generation targets by a factor of 20 as noted in #5647 (comment)
This PR restores the previous code (since moved to conversion_macros.h) and pre-0.3.31 performance