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special-case properly

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Folkert 2021-09-08 13:10:44 +02:00
parent 0d1cc3844e
commit bdd07b0968
1 changed files with 45 additions and 13 deletions
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58
compiler/mono/src/ir.rs
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@ -3739,35 +3739,67 @@ pub fn with_hole<'a>(
debug_assert_eq!(field_layouts.len(), symbols.len());
debug_assert_eq!(fields.len(), symbols.len());
let expr = Expr::Struct(symbols);
let mut stmt = Stmt::Let(assigned, expr, record_layout, hole);
if symbols.len() == 1 {
// TODO we can probably special-case this more, skippiing the generation of
// UpdateExisting
let mut stmt = hole.clone();
let it = field_layouts.iter().zip(symbols.iter()).zip(fields);
let what_to_do = &fields[0];
for ((field_layout, symbol), what_to_do) in it {
match what_to_do {
UpdateExisting(field) => {
substitute_in_exprs(env.arena, &mut stmt, assigned, symbols[0]);
stmt = assign_to_symbol(
env,
procs,
layout_cache,
field.var,
*field.loc_expr.clone(),
*symbol,
symbols[0],
stmt,
);
}
CopyExisting(index) => {
let access_expr = Expr::StructAtIndex {
structure,
index,
field_layouts,
};
stmt = Stmt::Let(*symbol, access_expr, *field_layout, arena.alloc(stmt));
CopyExisting(_) => {
unreachable!(
r"when a record has just one field and is updated, it must update that one field"
);
}
}
stmt
} else {
let expr = Expr::Struct(symbols);
let mut stmt = Stmt::Let(assigned, expr, record_layout, hole);
let it = field_layouts.iter().zip(symbols.iter()).zip(fields);
for ((field_layout, symbol), what_to_do) in it {
match what_to_do {
UpdateExisting(field) => {
stmt = assign_to_symbol(
env,
procs,
layout_cache,
field.var,
*field.loc_expr.clone(),
*symbol,
stmt,
);
}
CopyExisting(index) => {
let access_expr = Expr::StructAtIndex {
structure,
index,
field_layouts,
};
stmt =
Stmt::Let(*symbol, access_expr, *field_layout, arena.alloc(stmt));
}
}
}
stmt
}
stmt
}
Closure {