Ruan Comelli f8e97badb2 Add const support for float rounding methods ... Add const support for the float rounding methods floor, ceil, trunc, fract, round and round_ties_even. This works by moving the calculation logic from src/tools/miri/src/intrinsics/mod.rs into compiler/rustc_const_eval/src/interpret/intrinsics.rs. All relevant method definitions were adjusted to include the `const` keyword for all supported float types: f16, f32, f64 and f128. The constness is hidden behind the feature gate feature(const_float_round_methods) which is tracked in https://github.com/rust-lang/rust/issues/141555 This commit is a squash of the following commits: - test: add tests that we expect to pass when float rounding becomes const - feat: make float rounding methods `const` - fix: replace `rustc_allow_const_fn_unstable(core_intrinsics)` attribute with `#[rustc_const_unstable(feature = "f128", issue = "116909")]` in `library/core/src/num/f128.rs` - revert: undo update to `library/stdarch` - refactor: replace multiple `float_<mode>_intrinsic` rounding methods with a single, parametrized one - fix: add `#[cfg(not(bootstrap))]` to new const method tests - test: add extra sign tests to check `+0.0` and `-0.0` - revert: undo accidental changes to `round` docs - fix: gate `const` float round method behind `const_float_round_methods` - fix: remove unnecessary `#![feature(const_float_methods)]` - fix: remove unnecessary `#![feature(const_float_methods)]` [2] - revert: undo changes to `tests/ui/consts/const-eval/float_methods.rs` - fix: adjust after rebase - test: fix float tests - test: add tests for `fract` - chore: add commented-out `const_float_round_methods` feature gates to `f16` and `f128` - fix: adjust NaN when rounding floats - chore: add FIXME comment for de-duplicating float tests - test: remove unnecessary test file `tests/ui/consts/const-eval/float_methods.rs` - test: fix tests after upstream simplification of how float tests are run		2025-05-31 15:26:57 -03:00
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src	Add const support for float rounding methods	2025-05-31 15:26:57 -03:00
Cargo.toml	don't depend on rustc_attr_parsing if rustc_data_structures will do	2025-05-09 23:16:55 +02:00
messages.ftl	const-check: stop recommending the use of rustc_allow_const_fn_unstable	2025-05-25 22:47:21 +02:00