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| 1 | 1 | 
| 2 /* | 2 /* | 
| 3  * Copyright 2006 The Android Open Source Project | 3  * Copyright 2006 The Android Open Source Project | 
| 4  * | 4  * | 
| 5  * Use of this source code is governed by a BSD-style license that can be | 5  * Use of this source code is governed by a BSD-style license that can be | 
| 6  * found in the LICENSE file. | 6  * found in the LICENSE file. | 
| 7  */ | 7  */ | 
| 8 | 8 | 
| 9 | 9 | 
| 10 #ifndef SkMath_DEFINED | 10 #ifndef SkMath_DEFINED | 
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| 77 | 77 | 
| 78         static inline int SkCLZ(uint32_t mask) { | 78         static inline int SkCLZ(uint32_t mask) { | 
| 79             if (mask) { | 79             if (mask) { | 
| 80                 DWORD index; | 80                 DWORD index; | 
| 81                 _BitScanReverse(&index, mask); | 81                 _BitScanReverse(&index, mask); | 
| 82                 return index ^ 0x1F; | 82                 return index ^ 0x1F; | 
| 83             } else { | 83             } else { | 
| 84                 return 32; | 84                 return 32; | 
| 85             } | 85             } | 
| 86         } | 86         } | 
| 87     #elif defined(SK_CPU_ARM) || defined(__GNUC__) || defined(__clang__) | 87     #elif defined(SK_CPU_ARM32) || defined(__GNUC__) || defined(__clang__) | 
| 88         static inline int SkCLZ(uint32_t mask) { | 88         static inline int SkCLZ(uint32_t mask) { | 
| 89             // __builtin_clz(0) is undefined, so we have to detect that case. | 89             // __builtin_clz(0) is undefined, so we have to detect that case. | 
| 90             return mask ? __builtin_clz(mask) : 32; | 90             return mask ? __builtin_clz(mask) : 32; | 
| 91         } | 91         } | 
| 92     #else | 92     #else | 
| 93         #define SkCLZ(x)    SkCLZ_portable(x) | 93         #define SkCLZ(x)    SkCLZ_portable(x) | 
| 94     #endif | 94     #endif | 
| 95 #endif | 95 #endif | 
| 96 | 96 | 
| 97 /** | 97 /** | 
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| 202     SkASSERT(b <= 32767); | 202     SkASSERT(b <= 32767); | 
| 203     unsigned prod = SkMulS16(a, b) + 128; | 203     unsigned prod = SkMulS16(a, b) + 128; | 
| 204     return (prod + (prod >> 8)) >> 8; | 204     return (prod + (prod >> 8)) >> 8; | 
| 205 } | 205 } | 
| 206 | 206 | 
| 207 /** | 207 /** | 
| 208  * Stores numer/denom and numer%denom into div and mod respectively. | 208  * Stores numer/denom and numer%denom into div and mod respectively. | 
| 209  */ | 209  */ | 
| 210 template <typename In, typename Out> | 210 template <typename In, typename Out> | 
| 211 inline void SkTDivMod(In numer, In denom, Out* div, Out* mod) { | 211 inline void SkTDivMod(In numer, In denom, Out* div, Out* mod) { | 
| 212 #ifdef SK_CPU_ARM | 212 #ifdef SK_CPU_ARM32 | 
| 213     // If we wrote this as in the else branch, GCC won't fuse the two into one | 213     // If we wrote this as in the else branch, GCC won't fuse the two into one | 
| 214     // divmod call, but rather a div call followed by a divmod.  Silly!  This | 214     // divmod call, but rather a div call followed by a divmod.  Silly!  This | 
| 215     // version is just as fast as calling __aeabi_[u]idivmod manually, but with | 215     // version is just as fast as calling __aeabi_[u]idivmod manually, but with | 
| 216     // prettier code. | 216     // prettier code. | 
| 217     // | 217     // | 
| 218     // This benches as around 2x faster than the code in the else branch. | 218     // This benches as around 2x faster than the code in the else branch. | 
| 219     const In d = numer/denom; | 219     const In d = numer/denom; | 
| 220     *div = static_cast<Out>(d); | 220     *div = static_cast<Out>(d); | 
| 221     *mod = static_cast<Out>(numer-d*denom); | 221     *mod = static_cast<Out>(numer-d*denom); | 
| 222 #else | 222 #else | 
| 223     // On x86 this will just be a single idiv. | 223     // On x86 this will just be a single idiv. | 
| 224     *div = static_cast<Out>(numer/denom); | 224     *div = static_cast<Out>(numer/denom); | 
| 225     *mod = static_cast<Out>(numer%denom); | 225     *mod = static_cast<Out>(numer%denom); | 
| 226 #endif  // SK_CPU_ARM | 226 #endif | 
| 227 } | 227 } | 
| 228 | 228 | 
| 229 #endif | 229 #endif | 
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