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Lower intrinsics::offset to mir::BinOp::Offset

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They're semantically the same, so this means the backends don't need to handle the intrinsic and means fewer MIR basic blocks in pointer arithmetic code.
This commit is contained in:
Scott McMurray 2023-04-25 12:10:55 -07:00
parent a7aa20517c
commit 05a665f21a
7 changed files with 66 additions and 20 deletions
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17
compiler/rustc_mir_transform/src/lower_intrinsics.rs
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@ -192,6 +192,23 @@ impl<'tcx> MirPass<'tcx> for LowerIntrinsics {
terminator.kind = TerminatorKind::Goto { target };
}
}
sym::offset => {
let target = target.unwrap();
let Ok([ptr, delta]) = <[_; 2]>::try_from(std::mem::take(args)) else {
span_bug!(
terminator.source_info.span,
"Wrong number of arguments for offset intrinsic",
);
};
block.statements.push(Statement {
source_info: terminator.source_info,
kind: StatementKind::Assign(Box::new((
*destination,
Rvalue::BinaryOp(BinOp::Offset, Box::new((ptr, delta))),
))),
});
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, .. }) =