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Improve multiple return value copy-elision

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This commit is contained in:
gingerBill
2020-10-20 17:08:55 +01:00
parent c4dbc88a12
commit feeb342c00
4 changed files with 96 additions and 49 deletions
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src/ir.cpp
+17 -17
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@@ -11296,30 +11296,30 @@ void ir_begin_procedure_body(irProcedure *proc) {
if (proc->type->Proc.has_named_results) {
GB_ASSERT(proc->type->Proc.result_count > 0);
TypeTuple *results = &proc->type->Proc.results->Tuple;
for_array(i, results->variables) {
Entity *e = results->variables[i];
if (e->kind != Entity_Variable) {
continue;
}
GB_ASSERT(e->kind == Entity_Variable);
if (e->token.string != "") {
GB_ASSERT(!is_blank_ident(e->token));
irValue *res = ir_add_local(proc, e, e->identifier, true);
irValue *c = nullptr;
switch (e->Variable.param_value.kind) {
case ParameterValue_Constant:
c = ir_value_constant(e->type, e->Variable.param_value.value);
break;
case ParameterValue_Nil:
c = ir_value_nil(e->type);
break;
case ParameterValue_Location:
GB_PANIC("ParameterValue_Location");
break;
irAddr res = {};
if (proc->type->Proc.return_by_pointer) {
irValue *ptr = proc->return_ptr;
if (results->variables.count != 1) {
ptr = ir_emit_struct_ep(proc, ptr, cast(i32)i);
}
res = ir_addr(ptr);
ir_module_add_value(proc->module, e, ptr);
} else {
res = ir_addr(ir_add_local(proc, e, e->identifier, true));
}
if (c != nullptr) {
ir_emit_store(proc, res, c);
if (e->Variable.param_value.kind != ParameterValue_Invalid) {
irValue *c = ir_handle_param_value(proc, e->type, e->Variable.param_value, e->token.pos);
ir_addr_store(proc, res, c);
}
}
}