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Rollup merge of #129555 - RalfJung:const_float_bits_conv, r=dtolnay

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stabilize const_float_bits_conv

This stabilizes `const_float_bits_conv`, and thus fixes https://github.com/rust-lang/rust/issues/72447. With https://github.com/rust-lang/rust/pull/128596 having landed, this is entirely a libs-only question now.

```rust
impl f32 {
    pub const fn to_bits(self) -> u32;
    pub const fn from_bits(v: u32) -> Self;
    pub const fn to_be_bytes(self) -> [u8; 4];
    pub const fn to_le_bytes(self) -> [u8; 4]
    pub const fn to_ne_bytes(self) -> [u8; 4];
    pub const fn from_be_bytes(bytes: [u8; 4]) -> Self;
    pub const fn from_le_bytes(bytes: [u8; 4]) -> Self;
    pub const fn from_ne_bytes(bytes: [u8; 4]) -> Self;
}

impl f64 {
    pub const fn to_bits(self) -> u64;
    pub const fn from_bits(v: u64) -> Self;
    pub const fn to_be_bytes(self) -> [u8; 8];
    pub const fn to_le_bytes(self) -> [u8; 8]
    pub const fn to_ne_bytes(self) -> [u8; 8];
    pub const fn from_be_bytes(bytes: [u8; 8]) -> Self;
    pub const fn from_le_bytes(bytes: [u8; 8]) -> Self;
    pub const fn from_ne_bytes(bytes: [u8; 8]) -> Self;
}
````

Cc `@rust-lang/wg-const-eval` `@rust-lang/libs-api`
This commit is contained in:
Matthias Krüger 2024-09-07 23:30:11 +02:00 • committed by GitHub
commit c8f5136fe8
9 changed files with 186 additions and 46 deletions
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6
clippy_lints/src/transmute/mod.rs
View file

@ -619,10 +619,10 @@ impl<'tcx> LateLintPass<'tcx> for Transmute {
| transmute_ref_to_ref::check(cx, e, from_ty, to_ty, arg, const_context)
| transmute_ptr_to_ptr::check(cx, e, from_ty, to_ty, arg, &self.msrv)
| transmute_int_to_bool::check(cx, e, from_ty, to_ty, arg)
| transmute_int_to_float::check(cx, e, from_ty, to_ty, arg, const_context)
| transmute_int_to_float::check(cx, e, from_ty, to_ty, arg)
| transmute_int_to_non_zero::check(cx, e, from_ty, to_ty, arg)
| transmute_float_to_int::check(cx, e, from_ty, to_ty, arg, const_context)
| transmute_num_to_bytes::check(cx, e, from_ty, to_ty, arg, const_context)
| transmute_float_to_int::check(cx, e, from_ty, to_ty, arg)
| transmute_num_to_bytes::check(cx, e, from_ty, to_ty, arg)
| (unsound_collection_transmute::check(cx, e, from_ty, to_ty)
|| transmute_undefined_repr::check(cx, e, from_ty, to_ty))
| (eager_transmute::check(cx, e, arg, from_ty, to_ty));

3
clippy_lints/src/transmute/transmute_float_to_int.rs
View file

@ -15,10 +15,9 @@ pub(super) fn check<'tcx>(
from_ty: Ty<'tcx>,
to_ty: Ty<'tcx>,
mut arg: &'tcx Expr<'_>,
const_context: bool,
) -> bool {
match (&from_ty.kind(), &to_ty.kind()) {
(ty::Float(float_ty), ty::Int(_) | ty::Uint(_)) if !const_context => {
(ty::Float(float_ty), ty::Int(_) | ty::Uint(_)) => {
span_lint_and_then(
cx,
TRANSMUTE_FLOAT_TO_INT,

3
clippy_lints/src/transmute/transmute_int_to_float.rs
View file

@ -14,10 +14,9 @@ pub(super) fn check<'tcx>(
from_ty: Ty<'tcx>,
to_ty: Ty<'tcx>,
arg: &'tcx Expr<'_>,
const_context: bool,
) -> bool {
match (&from_ty.kind(), &to_ty.kind()) {
(ty::Int(_) | ty::Uint(_), ty::Float(_)) if !const_context => {
(ty::Int(_) | ty::Uint(_), ty::Float(_)) => {
span_lint_and_then(
cx,
TRANSMUTE_INT_TO_FLOAT,

6
clippy_lints/src/transmute/transmute_num_to_bytes.rs
View file

@ -14,18 +14,12 @@ pub(super) fn check<'tcx>(
from_ty: Ty<'tcx>,
to_ty: Ty<'tcx>,
arg: &'tcx Expr<'_>,
const_context: bool,
) -> bool {
match (&from_ty.kind(), &to_ty.kind()) {
(ty::Int(_) | ty::Uint(_) | ty::Float(_), ty::Array(arr_ty, _)) => {
if !matches!(arr_ty.kind(), ty::Uint(UintTy::U8)) {
return false;
}
if matches!(from_ty.kind(), ty::Float(_)) && const_context {
// TODO: Remove when const_float_bits_conv is stabilized
// rust#72447
return false;
}
span_lint_and_then(
cx,