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This is for an ARMv8 CPU running a 32bit OS, which identifies its arch
as armv7l. Compile flags must be set before the crypto feature is
exposed by the compiler:
-march=armv8-a+crypto -mfloat-abi=softfp -mfpu=crypto-neon-fp-armv8
Perf gain is actually minimal, probably too much overhead in moving
values between memory and vector registers. This PR is mainly for
documentation, not sure it's worth merging.