RDSEED and SHA enabled for AMD processors

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RDSEED and SHA enabled for AMD processors

Jeffrey Walton-3
Hi Everyone,

AMD donated a couple of Ryzen 7 machines to the GCC compile farm. The cpu's have both RDSEED and SHA available. The code in cpu.cpp was updated to detect the availability; see https://github.com/weidai11/cryptopp/commit/2f58912fddb2 .

AMD's SHA circuit is fast. Its pushing data at 1.2 cycles per byte. (My Intel test machine is a Celeron J3455, and it moving data at 2.5 cpb. The number should improve as SHA shows up in more-fully-featured Intel cpu's).

Jeff

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