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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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146 // Compare function to compare the object pointer value of two | 146 // Compare function to compare the object pointer value of two |
147 // handlified objects. The handles are passed as pointers to the | 147 // handlified objects. The handles are passed as pointers to the |
148 // handles. | 148 // handles. |
149 template<typename T> class Handle; // Forward declaration. | 149 template<typename T> class Handle; // Forward declaration. |
150 template <typename T> | 150 template <typename T> |
151 int HandleObjectPointerCompare(const Handle<T>* a, const Handle<T>* b) { | 151 int HandleObjectPointerCompare(const Handle<T>* a, const Handle<T>* b) { |
152 return Compare<T*>(*(*a), *(*b)); | 152 return Compare<T*>(*(*a), *(*b)); |
153 } | 153 } |
154 | 154 |
155 | 155 |
156 // Returns the smallest power of two which is >= x. If you pass in a | 156 template<typename int_type> |
157 // number that is already a power of two, it is returned as is. | 157 inline int RoundUpToPowerOf2(int_type x_argument) { |
158 // Implementation is from "Hacker's Delight" by Henry S. Warren, Jr., | 158 uintptr_t x = static_cast<uintptr_t>(x_argument); |
159 // figure 3-3, page 48, where the function is called clp2. | |
160 inline uint32_t RoundUpToPowerOf2(uint32_t x) { | |
161 ASSERT(x <= 0x80000000u); | 159 ASSERT(x <= 0x80000000u); |
162 x = x - 1; | 160 x = x - 1; |
163 x = x | (x >> 1); | 161 x = x | (x >> 1); |
164 x = x | (x >> 2); | 162 x = x | (x >> 2); |
165 x = x | (x >> 4); | 163 x = x | (x >> 4); |
166 x = x | (x >> 8); | 164 x = x | (x >> 8); |
167 x = x | (x >> 16); | 165 x = x | (x >> 16); |
168 return x + 1; | 166 return static_cast<int_type>(x + 1); |
169 } | 167 } |
170 | 168 |
171 | 169 |
172 inline uint32_t RoundDownToPowerOf2(uint32_t x) { | 170 inline uint32_t RoundDownToPowerOf2(uint32_t x) { |
173 uint32_t rounded_up = RoundUpToPowerOf2(x); | 171 uint32_t rounded_up = RoundUpToPowerOf2(x); |
174 if (rounded_up > x) return rounded_up >> 1; | 172 if (rounded_up > x) return rounded_up >> 1; |
175 return rounded_up; | 173 return rounded_up; |
176 } | 174 } |
177 | 175 |
178 | 176 |
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950 ASSERT(element < static_cast<int>(sizeof(T) * CHAR_BIT)); | 948 ASSERT(element < static_cast<int>(sizeof(T) * CHAR_BIT)); |
951 return 1 << element; | 949 return 1 << element; |
952 } | 950 } |
953 | 951 |
954 T bits_; | 952 T bits_; |
955 }; | 953 }; |
956 | 954 |
957 } } // namespace v8::internal | 955 } } // namespace v8::internal |
958 | 956 |
959 #endif // V8_UTILS_H_ | 957 #endif // V8_UTILS_H_ |
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