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Enable f16 for MIPS #137311

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Enable f16 for MIPS #137311

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@martn3 martn3 commented Feb 20, 2025

Blocked on rust-lang/compiler-builtins#762

It seems as if f16 works on MIPS now according to my testing on Rust master with LLVM 20, and I was asked here to create PRs with my changes.

I only tested on the flavour of mipsel-unknown-linux-gnu hardware that happens to be available to me, so I can't say anything about other MIPS hardware, but from a casual skimming of the LLVM code (1, 2) it seems like f16 should work on all MIPS hardware. So enable it for all MIPS hardware.

@rustbot label +O-MIPS +F-f16_and_f128 +S-blocked

Tracking issue for f16: #116909

r? @tgross35

It seems as if `f16` works on MIPS now according to my
testing on Rust master with LLVM 20, and I was asked to
create PRs with my changes.

I only tested on the flavour of `mipsel-unknown-linux-gnu`
hardware that happens to be available to me, so I can't say
anything about other MIPS hardware, but from a casual
skimming of the LLVM code ([1], [2]) it seems like `f16`
should work on all MIPS hardware. So enable it for all MIPS
hardware.

[1]: https://github.com/rust-lang/llvm-project/blob/rustc/20.1-2025-02-13/llvm/lib/Target/Mips/MipsISelLowering.h#L370
[2]: https://github.com/rust-lang/llvm-project/blob/rustc/20.1-2025-02-13/llvm/lib/CodeGen/TargetLoweringBase.cpp#L1367-L1388
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rustbot commented Feb 20, 2025

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @tgross35 (or someone else) some time within the next two weeks.

Please see the contribution instructions for more information. Namely, in order to ensure the minimum review times lag, PR authors and assigned reviewers should ensure that the review label (S-waiting-on-review and S-waiting-on-author) stays updated, invoking these commands when appropriate:

  • @rustbot author: the review is finished, PR author should check the comments and take action accordingly
  • @rustbot review: the author is ready for a review, this PR will be queued again in the reviewer's queue

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. F-f16_and_f128 `#![feature(f16)]`, `#![feature(f128)]` O-MIPS Target: MIPS processors S-blocked Status: Blocked on something else such as an RFC or other implementation work. labels Feb 20, 2025
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LGTM after the builtins update goes through, thanks!

@tgross35 tgross35 removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Feb 20, 2025
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F-f16_and_f128 `#![feature(f16)]`, `#![feature(f128)]` O-MIPS Target: MIPS processors S-blocked Status: Blocked on something else such as an RFC or other implementation work. T-libs Relevant to the library team, which will review and decide on the PR/issue.
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