bjoernager/rust
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move Option::as_slice to intrinsic

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This commit is contained in:
Andre Bogus 2023-03-15 16:29:52 +01:00
parent cd6c574af3
commit 27e9ee9bae
8 changed files with 152 additions and 72 deletions
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30
compiler/rustc_mir_transform/src/lower_intrinsics.rs
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@ -6,6 +6,7 @@ use rustc_middle::ty::subst::SubstsRef;
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_span::symbol::{sym, Symbol};
use rustc_span::Span;
use rustc_target::abi::VariantIdx;
pub struct LowerIntrinsics;
@ -191,6 +192,35 @@ impl<'tcx> MirPass<'tcx> for LowerIntrinsics {
terminator.kind = TerminatorKind::Goto { target };
}
}
sym::option_payload_ptr => {
if let (Some(target), Some(arg)) = (*target, args[0].place()) {
let ty::RawPtr(ty::TypeAndMut { ty: dest_ty, .. }) =
destination.ty(local_decls, tcx).ty.kind()
else { bug!(); };
block.statements.push(Statement {
source_info: terminator.source_info,
kind: StatementKind::Assign(Box::new((
*destination,
Rvalue::AddressOf(
Mutability::Not,
arg.project_deeper(
&[
PlaceElem::Deref,
PlaceElem::Downcast(
Some(sym::Some),
VariantIdx::from_u32(1),
),
PlaceElem::Field(Field::from_u32(0), *dest_ty),
],
tcx,
),
),
))),
});
terminator.kind = TerminatorKind::Goto { target };
}
}
_ if intrinsic_name.as_str().starts_with("simd_shuffle") => {
validate_simd_shuffle(tcx, args, terminator.source_info.span);
}