src/base/intmath.test.cc

   1 /*
   2  * Copyright (c) 2019 The Regents of the University of California
   3  * All rights reserved
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Bobby R. Bruce
  29             Mahyar Samani
  30  */
  31
  32 #include <gtest/gtest.h>
  33
  34 #include "base/intmath.hh"
  35
  36 TEST(IntmathTest, isPowerOf2)
  37 {
  38     EXPECT_TRUE(isPowerOf2(1));
  39     EXPECT_TRUE(isPowerOf2(65536));
  40     EXPECT_TRUE(isPowerOf2(131072));
  41     EXPECT_TRUE(isPowerOf2(262144));
  42     EXPECT_FALSE(isPowerOf2(0));
  43     EXPECT_FALSE(isPowerOf2(2521));
  44     EXPECT_FALSE(isPowerOf2(1679616));
  45 }
  46
  47 TEST(IntmathTest, power)
  48 {
  49     EXPECT_EQ(65536, power(2, 16));
  50     EXPECT_EQ(9765625, power(5, 10));
  51     EXPECT_EQ(43046721, power(power(3, 4), 4));
  52 }
  53
  54 TEST(IntmathTest, floorLog2)
  55 {
  56     EXPECT_EQ(0, floorLog2(1));
  57     EXPECT_EQ(4, floorLog2(16));
  58     EXPECT_EQ(4, floorLog2(31));
  59     EXPECT_EQ(5, floorLog2(36));
  60     EXPECT_EQ(8, floorLog2(436));
  61     EXPECT_EQ(16, floorLog2(65537));
  62     EXPECT_EQ(20, floorLog2(1783592));
  63     EXPECT_EQ(41, floorLog2(2821109907456));
  64 }
  65
  66 TEST(IntmathTest, ceilLog2)
  67 {
  68     EXPECT_EQ(0, ceilLog2(1));
  69     EXPECT_EQ(4, ceilLog2(16));
  70     EXPECT_EQ(5, ceilLog2(31));
  71     EXPECT_EQ(6, ceilLog2(36));
  72     EXPECT_EQ(9, ceilLog2(436));
  73     EXPECT_EQ(17, ceilLog2(65537));
  74     EXPECT_EQ(21, ceilLog2(1783592));
  75     EXPECT_EQ(42, ceilLog2(2821109907456));
  76 }
  77
  78
  79 TEST(IntmathTest, divCeil)
  80 {
  81     EXPECT_EQ(5, divCeil(55, 13));
  82     EXPECT_EQ(90, divCeil(7922, 89));
  83     EXPECT_EQ(4, divCeil(4800, 1442));
  84     EXPECT_EQ(4, divCeil(75, 24));
  85     EXPECT_EQ(46, divCeil(451, 10));
  86 }
  87
  88 TEST(IntmathTest, roundUp)
  89 {
  90     EXPECT_EQ(4104, roundUp(4101, 4));
  91     EXPECT_EQ(4112, roundUp(4105, 8));
  92     EXPECT_EQ(4112, roundUp(4101, 16));
  93     EXPECT_EQ(8192, roundUp(7991, 256));
  94 }
  95
  96 TEST(IntmathTest, roundDown)
  97 {
  98     EXPECT_EQ(4100, roundDown(4101, 4));
  99     EXPECT_EQ(4104, roundDown(4105, 8));
 100     EXPECT_EQ(4096, roundDown(4101, 16));
 101     EXPECT_EQ(7936, roundDown(7991, 256));
 102 }