unittests/ADT/IntEqClassesTest.cpp

   1 //===---- ADT/IntEqClassesTest.cpp - IntEqClasses unit tests ----*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/ADT/IntEqClasses.h"
  10 #include "gtest/gtest.h"
  11
  12 using namespace llvm;
  13
  14 namespace {
  15
  16 TEST(IntEqClasses, Simple) {
  17   IntEqClasses ec(10);
  18
  19   ec.join(0, 1);
  20   ec.join(3, 2);
  21   ec.join(4, 5);
  22   ec.join(7, 6);
  23
  24   EXPECT_EQ(0u, ec.findLeader(0));
  25   EXPECT_EQ(0u, ec.findLeader(1));
  26   EXPECT_EQ(2u, ec.findLeader(2));
  27   EXPECT_EQ(2u, ec.findLeader(3));
  28   EXPECT_EQ(4u, ec.findLeader(4));
  29   EXPECT_EQ(4u, ec.findLeader(5));
  30   EXPECT_EQ(6u, ec.findLeader(6));
  31   EXPECT_EQ(6u, ec.findLeader(7));
  32   EXPECT_EQ(8u, ec.findLeader(8));
  33   EXPECT_EQ(9u, ec.findLeader(9));
  34
  35   // join two non-leaders.
  36   ec.join(1, 3);
  37
  38   EXPECT_EQ(0u, ec.findLeader(0));
  39   EXPECT_EQ(0u, ec.findLeader(1));
  40   EXPECT_EQ(0u, ec.findLeader(2));
  41   EXPECT_EQ(0u, ec.findLeader(3));
  42   EXPECT_EQ(4u, ec.findLeader(4));
  43   EXPECT_EQ(4u, ec.findLeader(5));
  44   EXPECT_EQ(6u, ec.findLeader(6));
  45   EXPECT_EQ(6u, ec.findLeader(7));
  46   EXPECT_EQ(8u, ec.findLeader(8));
  47   EXPECT_EQ(9u, ec.findLeader(9));
  48
  49   // join two leaders.
  50   ec.join(4, 8);
  51
  52   EXPECT_EQ(0u, ec.findLeader(0));
  53   EXPECT_EQ(0u, ec.findLeader(1));
  54   EXPECT_EQ(0u, ec.findLeader(2));
  55   EXPECT_EQ(0u, ec.findLeader(3));
  56   EXPECT_EQ(4u, ec.findLeader(4));
  57   EXPECT_EQ(4u, ec.findLeader(5));
  58   EXPECT_EQ(6u, ec.findLeader(6));
  59   EXPECT_EQ(6u, ec.findLeader(7));
  60   EXPECT_EQ(4u, ec.findLeader(8));
  61   EXPECT_EQ(9u, ec.findLeader(9));
  62
  63   // join mixed.
  64   ec.join(9, 1);
  65
  66   EXPECT_EQ(0u, ec.findLeader(0));
  67   EXPECT_EQ(0u, ec.findLeader(1));
  68   EXPECT_EQ(0u, ec.findLeader(2));
  69   EXPECT_EQ(0u, ec.findLeader(3));
  70   EXPECT_EQ(4u, ec.findLeader(4));
  71   EXPECT_EQ(4u, ec.findLeader(5));
  72   EXPECT_EQ(6u, ec.findLeader(6));
  73   EXPECT_EQ(6u, ec.findLeader(7));
  74   EXPECT_EQ(4u, ec.findLeader(8));
  75   EXPECT_EQ(0u, ec.findLeader(9));
  76
  77   // compressed map.
  78   ec.compress();
  79   EXPECT_EQ(3u, ec.getNumClasses());
  80
  81   EXPECT_EQ(0u, ec[0]);
  82   EXPECT_EQ(0u, ec[1]);
  83   EXPECT_EQ(0u, ec[2]);
  84   EXPECT_EQ(0u, ec[3]);
  85   EXPECT_EQ(1u, ec[4]);
  86   EXPECT_EQ(1u, ec[5]);
  87   EXPECT_EQ(2u, ec[6]);
  88   EXPECT_EQ(2u, ec[7]);
  89   EXPECT_EQ(1u, ec[8]);
  90   EXPECT_EQ(0u, ec[9]);
  91
  92   // uncompressed map.
  93   ec.uncompress();
  94   EXPECT_EQ(0u, ec.findLeader(0));
  95   EXPECT_EQ(0u, ec.findLeader(1));
  96   EXPECT_EQ(0u, ec.findLeader(2));
  97   EXPECT_EQ(0u, ec.findLeader(3));
  98   EXPECT_EQ(4u, ec.findLeader(4));
  99   EXPECT_EQ(4u, ec.findLeader(5));
 100   EXPECT_EQ(6u, ec.findLeader(6));
 101   EXPECT_EQ(6u, ec.findLeader(7));
 102   EXPECT_EQ(4u, ec.findLeader(8));
 103   EXPECT_EQ(0u, ec.findLeader(9));
 104 }
 105
 106 } // end anonymous namespace