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emit less MultiTagUnion

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This commit is contained in:
Folkert 2021-06-21 20:56:03 +02:00
parent 5734cce250
commit cc93da006d
5 changed files with 31 additions and 18 deletions
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7
compiler/mono/src/decision_tree.rs
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@ -1036,8 +1036,8 @@ fn path_to_expr_help<'a>(
let mut it = instructions.iter().peekable();
while let Some(PathInstruction { index, tag_id }) = it.next() {
match Wrapped::opt_from_layout(&layout) {
None => {
match Wrapped::is_indexable(&layout) {
false => {
// this MUST be an index into a single-element (hence unwrapped) record
debug_assert_eq!(*index, 0, "{:?}", &layout);
@ -1063,7 +1063,7 @@ fn path_to_expr_help<'a>(
break;
}
Some(wrapped) => {
true => {
let index = *index;
let (inner_layout, inner_expr) = match layout {
@ -1078,6 +1078,7 @@ fn path_to_expr_help<'a>(
(union_layout.layout_at(*tag_id as u8, index as usize), expr)
}
Layout::Struct(field_layouts) => {
let wrapped = Wrapped::opt_from_layout(&layout).unwrap();
debug_assert!(field_layouts.len() > 1);
debug_assert_eq!(wrapped, Wrapped::RecordOrSingleTagUnion);