__builtin_riscv_pause not listed in document

riscv-non-isa / riscv-c-api-doc

Documentation of the RISC-V C API

https://jira.riscv.org/browse/RVG-4

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__builtin_riscv_pause not listed in document #81

Open KaiYG opened 2 months ago

KaiYG commented 2 months ago

I notice that __builtin_riscv_pause has been supported on GCC for a while but not listed in risc-c-api-doc. Is it an official api and just not yet updated to the document?

cmuellner commented 2 months ago

The name __builtin_riscv_pause does not conform with the naming convention of RISC-V intrinsics (which need a prefix __riscv_).

In other words, there is no defined interoperable intrinsic function to emit a PAUSE instruction.

To introduce one, the following steps could be taken:

make a proposal for the intrinsic in a PR for this repo
create and publish patches for GCC and LLVM (if necessary) that reference the PR