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//===- llvm/unittest/CodeGen/TypeTraitsTest.cpp --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/RDFRegisters.h"
#include "llvm/CodeGen/RegisterPressure.h"
#include "llvm/CodeGen/ScheduleDAG.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/CodeGen/SlotIndexes.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "gtest/gtest.h"
#include <functional>
#include <type_traits>
#include <utility>
using namespace llvm;
static_assert(std::is_trivially_copyable_v<PressureChange>,
"trivially copyable");
static_assert(std::is_trivially_copyable_v<SDep>, "trivially copyable");
static_assert(std::is_trivially_copyable_v<SDValue>, "trivially copyable");
static_assert(std::is_trivially_copyable_v<SlotIndex>, "trivially copyable");
static_assert(std::is_trivially_copyable_v<IdentifyingPassPtr>,
"trivially copyable");
// https://llvm.org/PR105169
// Verify that we won't accidently specialize std::less and std::equal_to in a
// wrong way.
// C++17 [namespace.std]/2, C++20/23 [namespace.std]/5:
// A program may explicitly instantiate a template defined in the standard
// library only if the declaration
// - depends on the name of a user-defined type and
// - the instantiation meets the standard library requirements for the
// original template.
template <class Fn> constexpr bool CheckStdCmpRequirements() {
// std::less and std::equal_to are literal, default constructible, and
// copyable classes.
Fn f1{};
auto f2 = f1;
auto f3 = std::move(f2);
f2 = f3;
f2 = std::move(f3);
// Properties held on all known implementations, although not guaranteed by
// the standard.
static_assert(std::is_empty_v<Fn>);
static_assert(std::is_trivially_default_constructible_v<Fn>);
static_assert(std::is_trivially_copyable_v<Fn>);
return true;
}
static_assert(CheckStdCmpRequirements<std::less<rdf::RegisterRef>>(),
"same as the original template");
static_assert(CheckStdCmpRequirements<std::equal_to<rdf::RegisterRef>>(),
"same as the original template");
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