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Basic copy elision support for multiple return values

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gingerBill
2022-11-24 01:27:39 +00:00
parent aef8b25a8e
commit 0befadde1d
4 changed files with 160 additions and 76 deletions
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src/llvm_backend_stmt.cpp
+24 -24
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@@ -698,13 +698,13 @@ void lb_build_range_tuple(lbProcedure *p, Ast *expr, Type *val0_type, Type *val1
i32 tuple_count = cast(i32)tuple->Tuple.variables.count;
i32 cond_index = tuple_count-1;
lbValue cond = lb_emit_struct_ev(p, tuple_value, cond_index);
lbValue cond = lb_emit_tuple_ev(p, tuple_value, cond_index);
lb_emit_if(p, cond, body, done);
lb_start_block(p, body);
if (val0_) *val0_ = lb_emit_struct_ev(p, tuple_value, 0);
if (val1_) *val1_ = lb_emit_struct_ev(p, tuple_value, 1);
if (val0_) *val0_ = lb_emit_tuple_ev(p, tuple_value, 0);
if (val1_) *val1_ = lb_emit_tuple_ev(p, tuple_value, 1);
if (loop_) *loop_ = loop;
if (done_) *done_ = done;
}
@@ -1543,6 +1543,24 @@ void lb_build_static_variables(lbProcedure *p, AstValueDecl *vd) {
lb_add_member(p->module, mangled_name, global_val);
}
}
void lb_append_tuple_values(lbProcedure *p, Array<lbValue> *dst_values, lbValue src_value) {
Type *t = src_value.type;
if (t->kind == Type_Tuple) {
lbTupleFix *tf = map_get(&p->tuple_fix_map, src_value.value);
if (tf) {
for_array(j, tf->values) {
array_add(dst_values, tf->values[j]);
}
} else {
for_array(i, t->Tuple.variables) {
lbValue v = lb_emit_tuple_ev(p, src_value, cast(i32)i);
array_add(dst_values, v);
}
}
} else {
array_add(dst_values, src_value);
}
}
void lb_build_assignment(lbProcedure *p, Array<lbAddr> &lvals, Slice<Ast *> const &values) {
@@ -1554,18 +1572,8 @@ void lb_build_assignment(lbProcedure *p, Array<lbAddr> &lvals, Slice<Ast *> cons
for_array(i, values) {
Ast *rhs = values[i];
if (is_type_tuple(type_of_expr(rhs))) {
lbValue init = lb_build_expr(p, rhs);
Type *t = init.type;
GB_ASSERT(t->kind == Type_Tuple);
for_array(i, t->Tuple.variables) {
lbValue v = lb_emit_struct_ev(p, init, cast(i32)i);
array_add(&inits, v);
}
} else {
lbValue init = lb_build_expr(p, rhs);
array_add(&inits, init);
}
lbValue init = lb_build_expr(p, rhs);
lb_append_tuple_values(p, &inits, init);
}
GB_ASSERT(lvals.count == inits.count);
@@ -1655,15 +1663,7 @@ void lb_build_return_stmt(lbProcedure *p, Slice<Ast *> const &return_results) {
if (res_count != 0) {
for (isize res_index = 0; res_index < res_count; res_index++) {
lbValue res = lb_build_expr(p, return_results[res_index]);
Type *t = res.type;
if (t->kind == Type_Tuple) {
for_array(i, t->Tuple.variables) {
lbValue v = lb_emit_struct_ev(p, res, cast(i32)i);
array_add(&results, v);
}
} else {
array_add(&results, res);
}
lb_append_tuple_values(p, &results, res);
}
} else {
for (isize res_index = 0; res_index < return_count; res_index++) {