Testing for presence of _Zba and _Zbb

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  • cpu_features

    A cross platform C99 library to get cpu features at runtime.

    I wish it were rolled into something like https://github.com/google/cpu_features and yeah, the vector version detection too.

  • riscv-bitmanip

    Working draft of the proposed RISC-V Bitmanipulation extension

    I guess 0x20a52533 is a specific _zba instruction? Which one? I searched for "001000" (the left 6 bits of 0x20) in https://github.com/riscv/riscv-bitmanip/releases/download/1.0.0/bitmanip-1.0.0-38-g865e7a7.pdf , but couldn't find a match? Might be PEBKAC.

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