rust-lang / rust-lang/rfcs

Provide the llvm.is.constant/__builtin_constant_p intrinsic

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Description

These can be useful for inlining the simple cases of some functions (something like memcpy) without a code size penalty in the more complicated cases.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reviewing the requested llvm.is.constant and __builtin_constant_p intrinsics and determine what Rust-facing scope the proposal requires. The issue names no files or tests, so establish the relevant compiler entry points and define completion as a documented, reviewed proposal for providing these intrinsics.

Written by the indexing model from the issue text.

Assessment

Domain
compilers
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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