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
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  10  * notice, this list of conditions and the following disclaimer in the
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  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
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  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <gtest/gtest.h>
  30
  31 #include "base/intmath.hh"
  32
  33 TEST(IntmathTest, isPowerOf2)
  34 {
  35     EXPECT_TRUE(isPowerOf2(1));
  36     EXPECT_TRUE(isPowerOf2(65536));
  37     EXPECT_TRUE(isPowerOf2(131072));
  38     EXPECT_TRUE(isPowerOf2(262144));
  39     EXPECT_FALSE(isPowerOf2(0));
  40     EXPECT_FALSE(isPowerOf2(2521));
  41     EXPECT_FALSE(isPowerOf2(1679616));
  42 }
  43
  44 TEST(IntmathTest, power)
  45 {
  46     EXPECT_EQ(65536, power(2, 16));
  47     EXPECT_EQ(9765625, power(5, 10));
  48     EXPECT_EQ(43046721, power(power(3, 4), 4));
  49 }
  50
  51 TEST(IntmathTest, floorLog2)
  52 {
  53     EXPECT_EQ(0, floorLog2(1));
  54     EXPECT_EQ(4, floorLog2(16));
  55     EXPECT_EQ(4, floorLog2(31));
  56     EXPECT_EQ(5, floorLog2(36));
  57     EXPECT_EQ(8, floorLog2(436));
  58     EXPECT_EQ(16, floorLog2(65537));
  59     EXPECT_EQ(20, floorLog2(1783592));
  60     EXPECT_EQ(41, floorLog2(2821109907456));
  61 }
  62
  63 TEST(IntmathTest, ceilLog2)
  64 {
  65     EXPECT_EQ(0, ceilLog2(1));
  66     EXPECT_EQ(4, ceilLog2(16));
  67     EXPECT_EQ(5, ceilLog2(31));
  68     EXPECT_EQ(6, ceilLog2(36));
  69     EXPECT_EQ(9, ceilLog2(436));
  70     EXPECT_EQ(17, ceilLog2(65537));
  71     EXPECT_EQ(21, ceilLog2(1783592));
  72     EXPECT_EQ(42, ceilLog2(2821109907456));
  73 }
  74
  75
  76 TEST(IntmathTest, divCeil)
  77 {
  78     EXPECT_EQ(5, divCeil(55, 13));
  79     EXPECT_EQ(90, divCeil(7922, 89));
  80     EXPECT_EQ(4, divCeil(4800, 1442));
  81     EXPECT_EQ(4, divCeil(75, 24));
  82     EXPECT_EQ(46, divCeil(451, 10));
  83 }
  84
  85 TEST(IntmathTest, roundUp)
  86 {
  87     EXPECT_EQ(4104, roundUp(4101, 4));
  88     EXPECT_EQ(4112, roundUp(4105, 8));
  89     EXPECT_EQ(4112, roundUp(4101, 16));
  90     EXPECT_EQ(8192, roundUp(7991, 256));
  91 }
  92
  93 TEST(IntmathTest, roundDown)
  94 {
  95     EXPECT_EQ(4100, roundDown(4101, 4));
  96     EXPECT_EQ(4104, roundDown(4105, 8));
  97     EXPECT_EQ(4096, roundDown(4101, 16));
  98     EXPECT_EQ(7936, roundDown(7991, 256));
  99 }