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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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| 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 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. | 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 29 */ | 29 */ |
| 30 | 30 |
| 31 #ifndef SaturatedArithmetic_h | 31 #ifndef SaturatedArithmetic_h |
| 32 #define SaturatedArithmetic_h | 32 #define SaturatedArithmetic_h |
| 33 | 33 |
| 34 #include "wtf/CPU.h" | 34 #include <stdint.h> |
| 35 #include <limits> | 35 #include <limits> |
| 36 #include <stdint.h> | 36 #include "sky/engine/wtf/CPU.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 "sky/engine/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 { |
| 48 uint32_t ua = a; | 48 uint32_t ua = a; |
| 49 uint32_t ub = b; | 49 uint32_t ub = b; |
| 50 uint32_t result = ua + ub; | 50 uint32_t result = ua + ub; |
| 51 | 51 |
| 52 // Can only overflow if the signed bit of the two values match. If the | 52 // Can only overflow if the signed bit of the two values match. If the |
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| 110 std::numeric_limits<int>::max() >> FractionalShift; | 110 std::numeric_limits<int>::max() >> FractionalShift; |
| 111 | 111 |
| 112 if (value >= intMaxForLayoutUnit) | 112 if (value >= intMaxForLayoutUnit) |
| 113 return std::numeric_limits<int>::max(); | 113 return std::numeric_limits<int>::max(); |
| 114 | 114 |
| 115 return value << FractionalShift; | 115 return value << FractionalShift; |
| 116 } | 116 } |
| 117 | 117 |
| 118 #endif // CPU(ARM) && COMPILER(GCC) | 118 #endif // CPU(ARM) && COMPILER(GCC) |
| 119 #endif // SaturatedArithmetic_h | 119 #endif // SaturatedArithmetic_h |
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