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Auto merge of #88839 - nbdd0121:alignof, r=nagisa

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Introduce NullOp::AlignOf

This PR introduces `Rvalue::NullaryOp(NullOp::AlignOf, ty)`, which will be lowered from `align_of`, similar to `size_of` lowering to `Rvalue::NullaryOp(NullOp::SizeOf, ty)`.

The changes are originally part of #88700 but since it's not dependent on other changes and could have performance impact on its own, it's separated into its own PR.
This commit is contained in:
bors 2021-09-12 23:49:24 +00:00
commit 96dee2825e
21 changed files with 234 additions and 184 deletions
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9
compiler/rustc_mir_transform/src/lower_intrinsics.rs
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@ -92,14 +92,19 @@ impl<'tcx> MirPass<'tcx> for LowerIntrinsics {
// since their semantics depend on the value of overflow-checks flag used
// during codegen. Issue #35310.
}
sym::size_of => {
sym::size_of | sym::min_align_of => {
if let Some((destination, target)) = *destination {
let tp_ty = substs.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(NullOp::SizeOf, tp_ty),
Rvalue::NullaryOp(null_op, tp_ty),
))),
});
terminator.kind = TerminatorKind::Goto { target };