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Do not transmute immediates to non-immediates.

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This commit is contained in:
Camille GILLOT 2023-09-23 07:23:14 +00:00
parent db9bd9bd8c
commit 9389373127
1 changed files with 10 additions and 0 deletions
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10
compiler/rustc_mir_transform/src/gvn.rs
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@ -443,6 +443,16 @@ impl<'body, 'tcx> VnState<'body, 'tcx> {
CastKind::Transmute => {
let value = self.evaluated[value].as_ref()?;
let to = self.ecx.layout_of(to).ok()?;
// `offset` for immediates only supports scalar/scalar-pair ABIs,
// so bail out if the target is not one.
if value.as_mplace_or_imm().is_right() {
match to.abi {
Abi::Scalar(..) | Abi::ScalarPair(..) => {}
_ if to.is_zst() => {}
Abi::Aggregate { .. } if to.fields.count() == 0 => {}
_ => return None,
}
}
value.offset(Size::ZERO, to, &self.ecx).ok()?
}
_ => return None,