15825d5b78
Currently all the primitives are waiting for a rewrite, tidy them up in the meantime. Vast majority of cases pass sizes which are multiple of 8. Which means the following rep stosb/movb has nothing to do. Turns out testing first if there is anything to do is a big win across the board (cpus with and without ERMS, Intel and AMD) while not pessimizing the case where there is work to do. Sample results for zeroing 64 bytes (ops/second): Ryzen Threadripper 1950X 91433212 -> 147265741 Intel(R) Xeon(R) CPU X5675 @ 3.07GHz 90714044 -> 121992888 bzero and bcopy are on their way out and were not modified. Nothing in the tree uses them.
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