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Side by Side Diff: third_party/WebKit/Source/wtf/SaturatedArithmetic.h

Issue 1436153002: Apply clang-format with Chromium-style without column limit. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 5 years, 1 month ago
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1 /* 1 /*
2 * Copyright (c) 2012, Google Inc. All rights reserved. 2 * Copyright (c) 2012, Google Inc. All rights reserved.
3 * 3 *
4 * Redistribution and use in source and binary forms, with or without 4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are 5 * modification, are permitted provided that the following conditions are
6 * met: 6 * met:
7 * 7 *
8 * * Redistributions of source code must retain the above copyright 8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer. 9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above 10 * * Redistributions in binary form must reproduce the above
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36 #include <stdint.h> 36 #include <stdint.h>
37 37
38 #if CPU(ARM) && COMPILER(GCC) && __OPTIMIZE__ 38 #if CPU(ARM) && COMPILER(GCC) && __OPTIMIZE__
39 39
40 // If we're building ARM on GCC we replace the C++ versions with some 40 // If we're building ARM on GCC we replace the C++ versions with some
41 // native ARM assembly for speed. 41 // native ARM assembly for speed.
42 #include "wtf/asm/SaturatedArithmeticARM.h" 42 #include "wtf/asm/SaturatedArithmeticARM.h"
43 43
44 #else 44 #else
45 45
46 ALWAYS_INLINE int32_t saturatedAddition(int32_t a, int32_t b) 46 ALWAYS_INLINE int32_t saturatedAddition(int32_t a, int32_t b) {
47 { 47 uint32_t ua = a;
48 uint32_t ua = a; 48 uint32_t ub = b;
49 uint32_t ub = b; 49 uint32_t result = ua + ub;
50 uint32_t result = ua + ub;
51 50
52 // Can only overflow if the signed bit of the two values match. If the 51 // Can only overflow if the signed bit of the two values match. If the
53 // signed bit of the result and one of the values differ it overflowed. 52 // signed bit of the result and one of the values differ it overflowed.
54 53
55 if (~(ua ^ ub) & (result ^ ua) & (1 << 31)) 54 if (~(ua ^ ub) & (result ^ ua) & (1 << 31))
56 return std::numeric_limits<int>::max() + (ua >> 31); 55 return std::numeric_limits<int>::max() + (ua >> 31);
57 56
58 return result; 57 return result;
59 } 58 }
60 59
61 ALWAYS_INLINE int32_t saturatedSubtraction(int32_t a, int32_t b) 60 ALWAYS_INLINE int32_t saturatedSubtraction(int32_t a, int32_t b) {
62 { 61 uint32_t ua = a;
63 uint32_t ua = a; 62 uint32_t ub = b;
64 uint32_t ub = b; 63 uint32_t result = ua - ub;
65 uint32_t result = ua - ub;
66 64
67 // Can only overflow if the signed bit of the two input values differ. If 65 // Can only overflow if the signed bit of the two input values differ. If
68 // the signed bit of the result and the first value differ it overflowed. 66 // the signed bit of the result and the first value differ it overflowed.
69 67
70 if ((ua ^ ub) & (result ^ ua) & (1 << 31)) 68 if ((ua ^ ub) & (result ^ ua) & (1 << 31))
71 return std::numeric_limits<int>::max() + (ua >> 31); 69 return std::numeric_limits<int>::max() + (ua >> 31);
72 70
73 return result; 71 return result;
74 } 72 }
75 73
76 inline int getMaxSaturatedSetResultForTesting(int FractionalShift) 74 inline int getMaxSaturatedSetResultForTesting(int FractionalShift) {
77 { 75 // For C version the set function maxes out to max int, this differs from
78 // For C version the set function maxes out to max int, this differs from 76 // the ARM asm version, see SaturatedArithmetiARM.h for the equivalent asm
79 // the ARM asm version, see SaturatedArithmetiARM.h for the equivalent asm 77 // version.
80 // version. 78 return std::numeric_limits<int>::max();
81 return std::numeric_limits<int>::max();
82 } 79 }
83 80
84 inline int getMinSaturatedSetResultForTesting(int FractionalShift) 81 inline int getMinSaturatedSetResultForTesting(int FractionalShift) {
85 { 82 return std::numeric_limits<int>::min();
86 return std::numeric_limits<int>::min();
87 } 83 }
88 84
89 ALWAYS_INLINE int saturatedSet(int value, int FractionalShift) 85 ALWAYS_INLINE int saturatedSet(int value, int FractionalShift) {
90 { 86 const int intMaxForLayoutUnit =
91 const int intMaxForLayoutUnit = 87 std::numeric_limits<int>::max() >> FractionalShift;
92 std::numeric_limits<int>::max() >> FractionalShift;
93 88
94 const int intMinForLayoutUnit = 89 const int intMinForLayoutUnit =
95 std::numeric_limits<int>::min() >> FractionalShift; 90 std::numeric_limits<int>::min() >> FractionalShift;
96 91
97 if (value > intMaxForLayoutUnit) 92 if (value > intMaxForLayoutUnit)
98 return std::numeric_limits<int>::max(); 93 return std::numeric_limits<int>::max();
99 94
100 if (value < intMinForLayoutUnit) 95 if (value < intMinForLayoutUnit)
101 return std::numeric_limits<int>::min(); 96 return std::numeric_limits<int>::min();
102 97
103 return value << FractionalShift; 98 return value << FractionalShift;
104 } 99 }
105 100
101 ALWAYS_INLINE int saturatedSet(unsigned value, int FractionalShift) {
102 const unsigned intMaxForLayoutUnit =
103 std::numeric_limits<int>::max() >> FractionalShift;
106 104
107 ALWAYS_INLINE int saturatedSet(unsigned value, int FractionalShift) 105 if (value >= intMaxForLayoutUnit)
108 { 106 return std::numeric_limits<int>::max();
109 const unsigned intMaxForLayoutUnit =
110 std::numeric_limits<int>::max() >> FractionalShift;
111 107
112 if (value >= intMaxForLayoutUnit) 108 return value << FractionalShift;
113 return std::numeric_limits<int>::max();
114
115 return value << FractionalShift;
116 } 109 }
117 110
118 #endif // CPU(ARM) && COMPILER(GCC) 111 #endif // CPU(ARM) && COMPILER(GCC)
119 #endif // SaturatedArithmetic_h 112 #endif // SaturatedArithmetic_h
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