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Auto merge of #121926 - tgross35:f16-f128-step3-feature-gate, r=compiler-errors,petrochenkov

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`f16` and `f128` step 3: compiler support & feature gate

Continuation of https://github.com/rust-lang/rust/pull/121841, another portion of https://github.com/rust-lang/rust/pull/114607

This PR exposes the new types to the world and adds a feature gate. Marking this as a draft because I need some feedback on where I did the feature gate check. It also does not yet catch type via suffixed literals (so the feature gate test will fail, probably some others too because I haven't belssed).

If there is a better place to check all types after resolution, I can do that. If not, I figure maybe I can add a second gate location in AST when it checks numeric suffixes.

Unfortunately I still don't think there is much testing to be done for correctness (codegen tests or parsed value checks) until we have basic library support. I think that will be the next step.

Tracking issue: https://github.com/rust-lang/rust/issues/116909

r? `@compiler-errors`
cc `@Nilstrieb`
`@rustbot` label +F-f16_and_f128
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bors 2024-03-16 02:02:00 +00:00
commit c03ea3dfd9
21 changed files with 403 additions and 119 deletions
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4
compiler/rustc_feature/src/unstable.rs
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@ -463,6 +463,10 @@ declare_features! (
(unstable, extended_varargs_abi_support, "1.65.0", Some(100189)),
/// Allows defining `extern type`s.
(unstable, extern_types, "1.23.0", Some(43467)),
/// Allow using 128-bit (quad precision) floating point numbers.
(unstable, f128, "CURRENT_RUSTC_VERSION", Some(116909)),
/// Allow using 16-bit (half precision) floating point numbers.
(unstable, f16, "CURRENT_RUSTC_VERSION", Some(116909)),
/// Allows the use of `#[ffi_const]` on foreign functions.
(unstable, ffi_const, "1.45.0", Some(58328)),
/// Allows the use of `#[ffi_pure]` on foreign functions.