Pengcheng Wang 875b10f7d0 [RISCV] Support __builtin_cpu_is ...

We have defined `__riscv_cpu_model` variable in #101449. It contains
`mvendorid`, `marchid` and `mimpid` fields which are read via system
call `sys_riscv_hwprobe`.

We can support `__builtin_cpu_is` via comparing values in compiler's
CPU definitions and `__riscv_cpu_model`.

This depends on #116202.

Reviewers: lenary, BeMg, kito-cheng, preames, lukel97

Reviewed By: lenary

Pull Request: https://github.com/llvm/llvm-project/pull/116231

2024-11-22 22:58:54 +08:00

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