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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
This commit is contained in:
bors 2024-03-16 02:02:00 +00:00
commit c03ea3dfd9
21 changed files with 403 additions and 119 deletions
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8
compiler/rustc_mir_build/src/build/mod.rs
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@ -1,7 +1,7 @@
use crate::build::expr::as_place::PlaceBuilder;
use crate::build::scope::DropKind;
use itertools::Itertools;
use rustc_apfloat::ieee::{Double, Single};
use rustc_apfloat::ieee::{Double, Half, Quad, Single};
use rustc_apfloat::Float;
use rustc_ast::attr;
use rustc_data_structures::fx::FxHashMap;
@ -1060,7 +1060,8 @@ pub(crate) fn parse_float_into_scalar(
) -> Option<Scalar> {
let num = num.as_str();
match float_ty {
ty::FloatTy::F16 => unimplemented!("f16_f128"),
// FIXME(f16_f128): When available, compare to the library parser as with `f32` and `f64`
ty::FloatTy::F16 => num.parse::<Half>().ok().map(Scalar::from_f16),
ty::FloatTy::F32 => {
let Ok(rust_f) = num.parse::<f32>() else { return None };
let mut f = num
@ -1107,7 +1108,8 @@ pub(crate) fn parse_float_into_scalar(
Some(Scalar::from_f64(f))
}
ty::FloatTy::F128 => unimplemented!("f16_f128"),
// FIXME(f16_f128): When available, compare to the library parser as with `f32` and `f64`
ty::FloatTy::F128 => num.parse::<Quad>().ok().map(Scalar::from_f128),
}
}