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Improve consistency in LowerIntrinsics.
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In some cases `target` and `arg` are obtained fallibly, and in some
cases they are obtained infallibly. This commit changes them all to
infallible.
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@nnethercote
nnethercote committed Sep 3, 2024
1 parent 6305e8a commit 6c39576
Showing 1 changed file with 63 additions and 62 deletions.
125 changes: 63 additions & 62 deletions compiler/rustc_mir_transform/src/lower_intrinsics.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -35,20 +35,19 @@ impl<'tcx> MirPass<'tcx> for LowerIntrinsics {
terminator.kind = TerminatorKind::Goto { target };
}
sym::forget => {
if let Some(target) = *target {
block.statements.push(Statement {
source_info: terminator.source_info,
kind: StatementKind::Assign(Box::new((
*destination,
Rvalue::Use(Operand::Constant(Box::new(ConstOperand {
span: terminator.source_info.span,
user_ty: None,
const_: Const::zero_sized(tcx.types.unit),
}))),
))),
});
terminator.kind = TerminatorKind::Goto { target };
}
let target = target.unwrap();
block.statements.push(Statement {
source_info: terminator.source_info,
kind: StatementKind::Assign(Box::new((
*destination,
Rvalue::Use(Operand::Constant(Box::new(ConstOperand {
span: terminator.source_info.span,
user_ty: None,
const_: Const::zero_sized(tcx.types.unit),
}))),
))),
});
terminator.kind = TerminatorKind::Goto { target };
}
sym::copy_nonoverlapping => {
let target = target.unwrap();
Expand Down Expand Up @@ -121,43 +120,41 @@ impl<'tcx> MirPass<'tcx> for LowerIntrinsics {
terminator.kind = TerminatorKind::Goto { target };
}
sym::add_with_overflow | sym::sub_with_overflow | sym::mul_with_overflow => {
if let Some(target) = *target {
let Ok([lhs, rhs]) = take_array(args) else {
bug!("Wrong arguments for {} intrinsic", intrinsic.name);
};
let bin_op = match intrinsic.name {
sym::add_with_overflow => BinOp::AddWithOverflow,
sym::sub_with_overflow => BinOp::SubWithOverflow,
sym::mul_with_overflow => BinOp::MulWithOverflow,
_ => bug!("unexpected intrinsic"),
};
block.statements.push(Statement {
source_info: terminator.source_info,
kind: StatementKind::Assign(Box::new((
*destination,
Rvalue::BinaryOp(bin_op, Box::new((lhs.node, rhs.node))),
))),
});
terminator.kind = TerminatorKind::Goto { target };
}
let target = target.unwrap();
let Ok([lhs, rhs]) = take_array(args) else {
bug!("Wrong arguments for {} intrinsic", intrinsic.name);
};
let bin_op = match intrinsic.name {
sym::add_with_overflow => BinOp::AddWithOverflow,
sym::sub_with_overflow => BinOp::SubWithOverflow,
sym::mul_with_overflow => BinOp::MulWithOverflow,
_ => bug!("unexpected intrinsic"),
};
block.statements.push(Statement {
source_info: terminator.source_info,
kind: StatementKind::Assign(Box::new((
*destination,
Rvalue::BinaryOp(bin_op, Box::new((lhs.node, rhs.node))),
))),
});
terminator.kind = TerminatorKind::Goto { target };
}
sym::size_of | sym::min_align_of => {
if let Some(target) = *target {
let tp_ty = generic_args.type_at(0);
let null_op = match intrinsic.name {
sym::size_of => NullOp::SizeOf,
sym::min_align_of => NullOp::AlignOf,
_ => bug!("unexpected intrinsic"),
};
block.statements.push(Statement {
source_info: terminator.source_info,
kind: StatementKind::Assign(Box::new((
*destination,
Rvalue::NullaryOp(null_op, tp_ty),
))),
});
terminator.kind = TerminatorKind::Goto { target };
}
let target = target.unwrap();
let tp_ty = generic_args.type_at(0);
let null_op = match intrinsic.name {
sym::size_of => NullOp::SizeOf,
sym::min_align_of => NullOp::AlignOf,
_ => bug!("unexpected intrinsic"),
};
block.statements.push(Statement {
source_info: terminator.source_info,
kind: StatementKind::Assign(Box::new((
*destination,
Rvalue::NullaryOp(null_op, tp_ty),
))),
});
terminator.kind = TerminatorKind::Goto { target };
}
sym::read_via_copy => {
let Ok([arg]) = take_array(args) else {
Expand Down Expand Up @@ -219,17 +216,23 @@ impl<'tcx> MirPass<'tcx> for LowerIntrinsics {
terminator.kind = TerminatorKind::Goto { target };
}
sym::discriminant_value => {
if let (Some(target), Some(arg)) = (*target, args[0].node.place()) {
let arg = tcx.mk_place_deref(arg);
block.statements.push(Statement {
source_info: terminator.source_info,
kind: StatementKind::Assign(Box::new((
*destination,
Rvalue::Discriminant(arg),
))),
});
terminator.kind = TerminatorKind::Goto { target };
}
let target = target.unwrap();
let Ok([arg]) = take_array(args) else {
span_bug!(
terminator.source_info.span,
"Wrong arguments for discriminant_value intrinsic"
);
};
let arg = arg.node.place().unwrap();
let arg = tcx.mk_place_deref(arg);
block.statements.push(Statement {
source_info: terminator.source_info,
kind: StatementKind::Assign(Box::new((
*destination,
Rvalue::Discriminant(arg),
))),
});
terminator.kind = TerminatorKind::Goto { target };
}
sym::offset => {
let target = target.unwrap();
Expand Down Expand Up @@ -267,7 +270,6 @@ impl<'tcx> MirPass<'tcx> for LowerIntrinsics {
Rvalue::Cast(CastKind::Transmute, arg.node, dst_ty),
))),
});

if let Some(target) = *target {
terminator.kind = TerminatorKind::Goto { target };
} else {
Expand Down Expand Up @@ -299,7 +301,6 @@ impl<'tcx> MirPass<'tcx> for LowerIntrinsics {
Rvalue::Aggregate(Box::new(kind), fields.into()),
))),
});

terminator.kind = TerminatorKind::Goto { target };
}
sym::ptr_metadata => {
Expand Down

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