text: //===- llvm/unittest/CodeGen/AllocationOrderTest.cpp - AllocationOrder tests =//
  //
  // 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 "../lib/CodeGen/AllocationOrder.h"
  #include "gtest/gtest.h"
  
  using namespace llvm;
  
  namespace {
  std::vector<MCPhysReg> loadOrder(const AllocationOrder &O, unsigned Limit = 0) {
    std::vector<MCPhysReg> Ret;
    if (Limit == 0)
      for (auto R : O)
        Ret.push_back(R);
    else
      for (auto I = O.begin(), E = O.getOrderLimitEnd(Limit); I != E; ++I)
        Ret.push_back(*I);
    return Ret;
  }
  } // namespace
  
  TEST(AllocationOrderTest, Basic) {
    SmallVector<MCPhysReg, 16> Hints = {1, 2, 3};
    SmallVector<MCPhysReg, 16> Order = {4, 5, 6, 7};
    AllocationOrder O(std::move(Hints), Order, false);
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3, 4, 5, 6, 7}), loadOrder(O));
  }
  
  TEST(AllocationOrderTest, Duplicates) {
    SmallVector<MCPhysReg, 16> Hints = {1, 2, 3};
    SmallVector<MCPhysReg, 16> Order = {4, 1, 5, 6};
    AllocationOrder O(std::move(Hints), Order, false);
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3, 4, 5, 6}), loadOrder(O));
  }
  
  TEST(AllocationOrderTest, HardHints) {
    SmallVector<MCPhysReg, 16> Hints = {1, 2, 3};
    SmallVector<MCPhysReg, 16> Order = {4, 5, 6, 7};
    AllocationOrder O(std::move(Hints), Order, true);
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3}), loadOrder(O));
  }
  
  TEST(AllocationOrderTest, LimitsBasic) {
    SmallVector<MCPhysReg, 16> Hints = {1, 2, 3};
    SmallVector<MCPhysReg, 16> Order = {4, 5, 6, 7};
    AllocationOrder O(std::move(Hints), Order, false);
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3, 4, 5, 6, 7}), loadOrder(O, 0));
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3, 4}), loadOrder(O, 1));
    EXPECT_EQ(O.end(), O.getOrderLimitEnd(0));
  }
  
  TEST(AllocationOrderTest, LimitsDuplicates) {
    SmallVector<MCPhysReg, 16> Hints = {1, 2, 3};
    SmallVector<MCPhysReg, 16> Order = {4, 1, 5, 6};
    AllocationOrder O(std::move(Hints), Order, false);
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3, 4}), loadOrder(O, 1));
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3, 4}), loadOrder(O, 2));
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3, 4, 5}), loadOrder(O, 3));
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3, 4, 5, 6}), loadOrder(O, 4));
  }
  
  TEST(AllocationOrderTest, LimitsHardHints) {
    SmallVector<MCPhysReg, 16> Hints = {1, 2, 3};
    SmallVector<MCPhysReg, 16> Order = {4, 1, 5, 6};
    AllocationOrder O(std::move(Hints), Order, true);
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3}), loadOrder(O, 1));
  }
  
  TEST(AllocationOrderTest, DuplicateIsFirst) {
    SmallVector<MCPhysReg, 16> Hints = {1, 2, 3};
    SmallVector<MCPhysReg, 16> Order = {1, 4, 5, 6};
    AllocationOrder O(std::move(Hints), Order, false);
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3, 4, 5, 6}), loadOrder(O));
  }
  
  TEST(AllocationOrderTest, DuplicateIsFirstWithLimits) {
    SmallVector<MCPhysReg, 16> Hints = {1, 2, 3};
    SmallVector<MCPhysReg, 16> Order = {1, 4, 5, 6};
    AllocationOrder O(std::move(Hints), Order, false);
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3}), loadOrder(O, 1));
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3, 4}), loadOrder(O, 2));
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3, 4, 5}), loadOrder(O, 3));
  }
  
  TEST(AllocationOrderTest, NoHints) {
    SmallVector<MCPhysReg, 16> Hints;
    SmallVector<MCPhysReg, 16> Order = {1, 2, 3, 4};
    AllocationOrder O(std::move(Hints), Order, false);
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3, 4}), loadOrder(O));
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2}), loadOrder(O, 2));
    EXPECT_EQ((std::vector<MCPhysReg>{1, 2, 3}), loadOrder(O, 3));
  }
  
  TEST(AllocationOrderTest, IsHintTest) {
    SmallVector<MCPhysReg, 16> Hints = {1, 2, 3};
    SmallVector<MCPhysReg, 16> Order = {4, 1, 5, 6};
    AllocationOrder O(std::move(Hints), Order, false);
    auto I = O.begin();
    auto V = *I;
    EXPECT_TRUE(I.isHint());
    EXPECT_EQ(V, 1U);
    ++I;
    EXPECT_TRUE(I.isHint());
    ++I;
    EXPECT_TRUE(I.isHint());
    V = *(++I);
    EXPECT_FALSE(I.isHint());
    EXPECT_EQ(V, 4U);
    V = *(++I);
    EXPECT_TRUE(O.isHint(1));
    EXPECT_FALSE(I.isHint());
    EXPECT_EQ(V, 5U);
  }
  