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Side by Side Diff: third_party/WebKit/Source/wtf/BitwiseOperations.h

Issue 1611343002: wtf reformat test Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: pydent Created 4 years, 11 months ago
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1 /* 1 /*
2 * Copyright (C) 2013 Google Inc. All rights reserved. 2 * Copyright (C) 2013 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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43 #include <stdint.h> 43 #include <stdint.h>
44 44
45 #if COMPILER(MSVC) 45 #if COMPILER(MSVC)
46 #include <intrin.h> 46 #include <intrin.h>
47 #endif 47 #endif
48 48
49 namespace WTF { 49 namespace WTF {
50 50
51 #if COMPILER(MSVC) 51 #if COMPILER(MSVC)
52 52
53 ALWAYS_INLINE uint32_t countLeadingZeros32(uint32_t x) 53 ALWAYS_INLINE uint32_t countLeadingZeros32(uint32_t x) {
54 { 54 unsigned long index;
55 unsigned long index; 55 return LIKELY(_BitScanReverse(&index, x)) ? (31 - index) : 32;
56 return LIKELY(_BitScanReverse(&index, x)) ? (31 - index) : 32;
57 } 56 }
58 57
59 #if CPU(64BIT) 58 #if CPU(64BIT)
60 59
61 // MSVC only supplies _BitScanForward64 when building for a 64-bit target. 60 // MSVC only supplies _BitScanForward64 when building for a 64-bit target.
62 ALWAYS_INLINE uint64_t countLeadingZeros64(uint64_t x) 61 ALWAYS_INLINE uint64_t countLeadingZeros64(uint64_t x) {
63 { 62 unsigned long index;
64 unsigned long index; 63 return LIKELY(_BitScanReverse64(&index, x)) ? (63 - index) : 64;
65 return LIKELY(_BitScanReverse64(&index, x)) ? (63 - index) : 64;
66 } 64 }
67 65
68 #endif 66 #endif
69 67
70 #elif COMPILER(GCC) 68 #elif COMPILER(GCC)
71 69
72 // This is very annoying. __builtin_clz has undefined behaviour for an input of 70 // This is very annoying. __builtin_clz has undefined behaviour for an input of
73 // 0, even though these's clearly a return value that makes sense, and even 71 // 0, even though these's clearly a return value that makes sense, and even
74 // though nascent processor clz instructions have defined behaviour for 0. 72 // though nascent processor clz instructions have defined behaviour for 0.
75 // We could drop to raw __asm__ to do better, but we'll avoid doing that unless 73 // We could drop to raw __asm__ to do better, but we'll avoid doing that unless
76 // we see proof that we need to. 74 // we see proof that we need to.
77 ALWAYS_INLINE uint32_t countLeadingZeros32(uint32_t x) 75 ALWAYS_INLINE uint32_t countLeadingZeros32(uint32_t x) {
78 { 76 return LIKELY(x) ? __builtin_clz(x) : 32;
79 return LIKELY(x) ? __builtin_clz(x) : 32;
80 } 77 }
81 78
82 ALWAYS_INLINE uint64_t countLeadingZeros64(uint64_t x) 79 ALWAYS_INLINE uint64_t countLeadingZeros64(uint64_t x) {
83 { 80 return LIKELY(x) ? __builtin_clzll(x) : 64;
84 return LIKELY(x) ? __builtin_clzll(x) : 64;
85 } 81 }
86 82
87 #endif 83 #endif
88 84
89 #if CPU(64BIT) 85 #if CPU(64BIT)
90 86
91 ALWAYS_INLINE size_t countLeadingZerosSizet(size_t x) { return countLeadingZeros 64(x); } 87 ALWAYS_INLINE size_t countLeadingZerosSizet(size_t x) {
88 return countLeadingZeros64(x);
89 }
92 90
93 #else 91 #else
94 92
95 ALWAYS_INLINE size_t countLeadingZerosSizet(size_t x) { return countLeadingZeros 32(x); } 93 ALWAYS_INLINE size_t countLeadingZerosSizet(size_t x) {
94 return countLeadingZeros32(x);
95 }
96 96
97 #endif 97 #endif
98 98
99 } // namespace WTF 99 } // namespace WTF
100 100
101 #endif // WTF_BitwiseOperations_h 101 #endif // WTF_BitwiseOperations_h
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