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Auto merge of #117525 - GKFX:remove_option_payload_ptr, r=petrochenkov

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Remove option_payload_ptr; redundant to offset_of

The `option_payload_ptr` intrinsic is no longer required as `offset_of` supports traversing enums (#114208). This PR removes it in order to dogfood offset_of (as suggested at https://github.com/rust-lang/rust/issues/106655#issuecomment-1790907626). However, it will not build until those changes reach beta (which I think is within the next 8 days?) so I've opened it as a draft.
This commit is contained in:
bors 2023-11-18 12:45:42 +00:00
commit 33688d2467
11 changed files with 16 additions and 171 deletions
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32
compiler/rustc_mir_transform/src/lower_intrinsics.rs
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@ -4,7 +4,6 @@ use crate::MirPass;
use rustc_middle::mir::*;
use rustc_middle::ty::{self, TyCtxt};
use rustc_span::symbol::sym;
use rustc_target::abi::{FieldIdx, VariantIdx};
pub struct LowerIntrinsics;
@ -251,37 +250,6 @@ 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(FieldIdx::from_u32(0), *dest_ty),
],
tcx,
),
),
))),
});
terminator.kind = TerminatorKind::Goto { target };
}
}
sym::transmute | sym::transmute_unchecked => {
let dst_ty = destination.ty(local_decls, tcx).ty;
let Ok([arg]) = <[_; 1]>::try_from(std::mem::take(args)) else {