Avoid gating implementations at build time on x86_64
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tarcieri commented
ref10, if built with the CFLAGS that rfc7748_precomputed uses, is optimized with the MULX instruction, which causes illegal instruction errors. This means we can't use ref10 as a deoptimized alternative to rfc7748_precomputed if we detect that we aren't on a 4th gen Core CPU.
It'd be nice to vary CFLAGS for the codebases. One option would be to build rfc7748_precomputed as a static library, and then link with it when building the MRI extension.