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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_NUMERICS_SATURATED_ARITHMETIC_H_ | 5 #ifndef BASE_NUMERICS_SATURATED_ARITHMETIC_H_ |
6 #define BASE_NUMERICS_SATURATED_ARITHMETIC_H_ | 6 #define BASE_NUMERICS_SATURATED_ARITHMETIC_H_ |
7 | 7 |
8 #include <stdint.h> | 8 #include <stdint.h> |
9 | 9 |
10 #include <limits> | 10 #include <limits> |
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49 | 49 |
50 return result; | 50 return result; |
51 } | 51 } |
52 | 52 |
53 ALWAYS_INLINE int32_t SaturatedNegative(int32_t a) { | 53 ALWAYS_INLINE int32_t SaturatedNegative(int32_t a) { |
54 if (UNLIKELY(a == std::numeric_limits<int>::min())) | 54 if (UNLIKELY(a == std::numeric_limits<int>::min())) |
55 return std::numeric_limits<int>::max(); | 55 return std::numeric_limits<int>::max(); |
56 return -a; | 56 return -a; |
57 } | 57 } |
58 | 58 |
| 59 ALWAYS_INLINE int32_t SaturatedAbsolute(int32_t a) { |
| 60 if (a >= 0) |
| 61 return a; |
| 62 return SaturatedNegative(a); |
| 63 } |
| 64 |
59 ALWAYS_INLINE int GetMaxSaturatedSetResultForTesting(int fractional_shift) { | 65 ALWAYS_INLINE int GetMaxSaturatedSetResultForTesting(int fractional_shift) { |
60 // For C version the set function maxes out to max int, this differs from | 66 // For C version the set function maxes out to max int, this differs from |
61 // the ARM asm version, see saturated_arithmetic_arm.h for the equivalent asm | 67 // the ARM asm version, see saturated_arithmetic_arm.h for the equivalent asm |
62 // version. | 68 // version. |
63 return std::numeric_limits<int>::max(); | 69 return std::numeric_limits<int>::max(); |
64 } | 70 } |
65 | 71 |
66 ALWAYS_INLINE int GetMinSaturatedSetResultForTesting(int fractional_shift) { | 72 ALWAYS_INLINE int GetMinSaturatedSetResultForTesting(int fractional_shift) { |
67 return std::numeric_limits<int>::min(); | 73 return std::numeric_limits<int>::min(); |
68 } | 74 } |
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92 if (value >= kIntMaxForLayoutUnit) | 98 if (value >= kIntMaxForLayoutUnit) |
93 return std::numeric_limits<int>::max(); | 99 return std::numeric_limits<int>::max(); |
94 | 100 |
95 return value << fractional_shift; | 101 return value << fractional_shift; |
96 } | 102 } |
97 | 103 |
98 } // namespace base | 104 } // namespace base |
99 | 105 |
100 #endif // CPU(ARM) && COMPILER(GCC) | 106 #endif // CPU(ARM) && COMPILER(GCC) |
101 #endif // BASE_NUMERICS_SATURATED_ARITHMETIC_H_ | 107 #endif // BASE_NUMERICS_SATURATED_ARITHMETIC_H_ |
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