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Adding SGEMM tiny path for Zen architectures. Needed to cover some performance gaps seen wrt MKL Only allowing matrices that all fit into the L1 cache to the tiny path Only tuned for single threaded operation at the moment Todo: Tune cases where AVX2 performs better than AVX512 on Zen4 Todo: The current ranges are very conservative, there may be scope to increase the matrix sizes that go into the tiny path AMD-Internal: CPUPL-7555 Co-authored-by: Rohan Rayan rohrayan@amd.com