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Replace a match with an if let #85973

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Merged
merged 1 commit into from
Jun 7, 2021
+22 −25
Merged

Replace a match with an if let #85973

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47 changes: 22 additions & 25 deletions compiler/rustc_mir/src/transform/remove_zsts.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -16,32 +16,29 @@ impl<'tcx> MirPass<'tcx> for RemoveZsts {
let (basic_blocks, local_decls) = body.basic_blocks_and_local_decls_mut();
for block in basic_blocks.iter_mut() {
for statement in block.statements.iter_mut() {
match statement.kind {
StatementKind::Assign(box (place, _)) => {
let place_ty = place.ty(local_decls, tcx).ty;
if !maybe_zst(place_ty) {
continue;
}
let layout = match tcx.layout_of(param_env.and(place_ty)) {
Ok(layout) => layout,
Err(_) => continue,
};
if !layout.is_zst() {
continue;
}
if involves_a_union(place, local_decls, tcx) {
continue;
}
if tcx.consider_optimizing(|| {
format!(
"RemoveZsts - Place: {:?} SourceInfo: {:?}",
place, statement.source_info
)
}) {
statement.make_nop();
}
if let StatementKind::Assign(box (place, _)) = statement.kind {
let place_ty = place.ty(local_decls, tcx).ty;
if !maybe_zst(place_ty) {
continue;
}
let layout = match tcx.layout_of(param_env.and(place_ty)) {
Ok(layout) => layout,
Err(_) => continue,
};
if !layout.is_zst() {
continue;
}
if involves_a_union(place, local_decls, tcx) {
continue;
}
if tcx.consider_optimizing(|| {
format!(
"RemoveZsts - Place: {:?} SourceInfo: {:?}",
place, statement.source_info
)
}) {
statement.make_nop();
}
_ => {}
}
}
}
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