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IR: memoize compile-time evaluated fn invocations

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This commit is contained in:
Andrew Kelley
2016-12-18 18:23:46 -05:00
parent 4816121e00
commit f12fbce0f5
4 changed files with 69 additions and 7 deletions
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23
src/ir.cpp
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@@ -6049,13 +6049,22 @@ static TypeTableEntry *ir_analyze_fn_call(IrAnalyze *ira, IrInstructionCall *cal
if (return_type->id == TypeTableEntryIdInvalid)
return ira->codegen->builtin_types.entry_invalid;
// Analyze the fn body block like any other constant expression.
AstNode *body_node = fn_entry->fn_def_node->data.fn_def.body;
IrInstruction *result = ir_eval_const_value(ira->codegen, exec_scope, body_node, return_type,
ira->new_irb.exec->backward_branch_count, ira->new_irb.exec->backward_branch_quota, fn_entry,
nullptr, call_instruction->base.source_node, nullptr);
if (result->type_entry->id == TypeTableEntryIdInvalid)
return ira->codegen->builtin_types.entry_invalid;
IrInstruction *result;
auto entry = ira->codegen->memoized_fn_eval_table.maybe_get(exec_scope);
if (entry) {
result = entry->value;
} else {
// Analyze the fn body block like any other constant expression.
AstNode *body_node = fn_entry->fn_def_node->data.fn_def.body;
result = ir_eval_const_value(ira->codegen, exec_scope, body_node, return_type,
ira->new_irb.exec->backward_branch_count, ira->new_irb.exec->backward_branch_quota, fn_entry,
nullptr, call_instruction->base.source_node, nullptr);
if (result->type_entry->id == TypeTableEntryIdInvalid)
return ira->codegen->builtin_types.entry_invalid;
ira->codegen->memoized_fn_eval_table.put(exec_scope, result);
}
ConstExprValue *out_val = ir_build_const_from(ira, &call_instruction->base,
result->static_value.depends_on_compile_var);