1 /* 2 * Copyright (c) 2012, Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "config.h" 32 33 #include "wtf/SaturatedArithmetic.h" 34 #include <gtest/gtest.h> 35 #include <limits.h> 36 37 namespace { 38 39 TEST(WTF, SaturatedArithmeticAddition) 40 { 41 ASSERT_EQ(saturatedAddition(0, 0), 0); 42 ASSERT_EQ(saturatedAddition(0, 1), 1); 43 ASSERT_EQ(saturatedAddition(0, 100), 100); 44 ASSERT_EQ(saturatedAddition(100, 50), 150); 45 46 ASSERT_EQ(saturatedAddition(0, -1), -1); 47 ASSERT_EQ(saturatedAddition(1, -1), 0); 48 ASSERT_EQ(saturatedAddition(100, -50), 50); 49 ASSERT_EQ(saturatedAddition(50, -100), -50); 50 51 ASSERT_EQ(saturatedAddition(INT_MAX - 1, 0), INT_MAX - 1); 52 ASSERT_EQ(saturatedAddition(INT_MAX - 1, 1), INT_MAX); 53 ASSERT_EQ(saturatedAddition(INT_MAX - 1, 2), INT_MAX); 54 ASSERT_EQ(saturatedAddition(0, INT_MAX - 1), INT_MAX - 1); 55 ASSERT_EQ(saturatedAddition(1, INT_MAX - 1), INT_MAX); 56 ASSERT_EQ(saturatedAddition(2, INT_MAX - 1), INT_MAX); 57 ASSERT_EQ(saturatedAddition(INT_MAX - 1, INT_MAX - 1), INT_MAX); 58 ASSERT_EQ(saturatedAddition(INT_MAX, INT_MAX), INT_MAX); 59 60 ASSERT_EQ(saturatedAddition(INT_MIN, 0), INT_MIN); 61 ASSERT_EQ(saturatedAddition(INT_MIN + 1, 0), INT_MIN + 1); 62 ASSERT_EQ(saturatedAddition(INT_MIN + 1, 1), INT_MIN + 2); 63 ASSERT_EQ(saturatedAddition(INT_MIN + 1, 2), INT_MIN + 3); 64 ASSERT_EQ(saturatedAddition(INT_MIN + 1, -1), INT_MIN); 65 ASSERT_EQ(saturatedAddition(INT_MIN + 1, -2), INT_MIN); 66 ASSERT_EQ(saturatedAddition(0, INT_MIN + 1), INT_MIN + 1); 67 ASSERT_EQ(saturatedAddition(-1, INT_MIN + 1), INT_MIN); 68 ASSERT_EQ(saturatedAddition(-2, INT_MIN + 1), INT_MIN); 69 70 ASSERT_EQ(saturatedAddition(INT_MAX / 2, 10000), INT_MAX / 2 + 10000); 71 ASSERT_EQ(saturatedAddition(INT_MAX / 2 + 1, INT_MAX / 2 + 1), INT_MAX); 72 ASSERT_EQ(saturatedAddition(INT_MIN, INT_MAX), -1); 73 } 74 75 TEST(WTF, SaturatedArithmeticSubtraction) 76 { 77 ASSERT_EQ(saturatedSubtraction(0, 0), 0); 78 ASSERT_EQ(saturatedSubtraction(0, 1), -1); 79 ASSERT_EQ(saturatedSubtraction(0, 100), -100); 80 ASSERT_EQ(saturatedSubtraction(100, 50), 50); 81 82 ASSERT_EQ(saturatedSubtraction(0, -1), 1); 83 ASSERT_EQ(saturatedSubtraction(1, -1), 2); 84 ASSERT_EQ(saturatedSubtraction(100, -50), 150); 85 ASSERT_EQ(saturatedSubtraction(50, -100), 150); 86 87 ASSERT_EQ(saturatedSubtraction(INT_MAX, 0), INT_MAX); 88 ASSERT_EQ(saturatedSubtraction(INT_MAX, 1), INT_MAX - 1); 89 ASSERT_EQ(saturatedSubtraction(INT_MAX - 1, 0), INT_MAX - 1); 90 ASSERT_EQ(saturatedSubtraction(INT_MAX - 1, -1), INT_MAX); 91 ASSERT_EQ(saturatedSubtraction(INT_MAX - 1, -2), INT_MAX); 92 ASSERT_EQ(saturatedSubtraction(0, INT_MAX - 1), -INT_MAX + 1); 93 ASSERT_EQ(saturatedSubtraction(-1, INT_MAX - 1), -INT_MAX); 94 ASSERT_EQ(saturatedSubtraction(-2, INT_MAX - 1), -INT_MAX - 1); 95 ASSERT_EQ(saturatedSubtraction(-3, INT_MAX - 1), -INT_MAX - 1); 96 97 ASSERT_EQ(saturatedSubtraction(INT_MIN, 0), INT_MIN); 98 ASSERT_EQ(saturatedSubtraction(INT_MIN + 1, 0), INT_MIN + 1); 99 ASSERT_EQ(saturatedSubtraction(INT_MIN + 1, 1), INT_MIN); 100 ASSERT_EQ(saturatedSubtraction(INT_MIN + 1, 2), INT_MIN); 101 102 ASSERT_EQ(saturatedSubtraction(INT_MIN, INT_MIN), 0); 103 ASSERT_EQ(saturatedSubtraction(INT_MAX, INT_MAX), 0); 104 ASSERT_EQ(saturatedSubtraction(INT_MAX, INT_MIN), INT_MAX); 105 } 106 107 } // namespace 108
