| OLD | NEW |
| 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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