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Side by Side Diff: sky/engine/wtf/BitwiseOperations.h

Issue 746023002: Make absolute and sort all Sky headers (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 6 years, 1 month 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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30 30
31 #ifndef WTF_BitwiseOperations_h 31 #ifndef WTF_BitwiseOperations_h
32 #define WTF_BitwiseOperations_h 32 #define WTF_BitwiseOperations_h
33 33
34 // DESCRIPTION 34 // DESCRIPTION
35 // countLeadingZeros() is a bitwise operation that counts the number of leading 35 // countLeadingZeros() is a bitwise operation that counts the number of leading
36 // zeros in a binary value, starting with the most significant bit. C does not 36 // zeros in a binary value, starting with the most significant bit. C does not
37 // have an operator to do this, but fortunately the various compilers have 37 // have an operator to do this, but fortunately the various compilers have
38 // built-ins that map to fast underlying processor instructions. 38 // built-ins that map to fast underlying processor instructions.
39 39
40 #include "wtf/CPU.h" 40 #include "sky/engine/wtf/CPU.h"
41 #include "wtf/Compiler.h" 41 #include "sky/engine/wtf/Compiler.h"
42 42
43 #include <stdint.h> 43 #include <stdint.h>
44 44
45 namespace WTF { 45 namespace WTF {
46 46
47 #if COMPILER(GCC) 47 #if COMPILER(GCC)
48 48
49 // This is very annoying. __builtin_clz has undefined behaviour for an input of 49 // This is very annoying. __builtin_clz has undefined behaviour for an input of
50 // 0, even though these's clearly a return value that makes sense, and even 50 // 0, even though these's clearly a return value that makes sense, and even
51 // though nascent processor clz instructions have defined behaviour for 0. 51 // though nascent processor clz instructions have defined behaviour for 0.
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69 69
70 #else 70 #else
71 71
72 ALWAYS_INLINE size_t countLeadingZerosSizet(size_t x) { return countLeadingZeros 32(x); } 72 ALWAYS_INLINE size_t countLeadingZerosSizet(size_t x) { return countLeadingZeros 32(x); }
73 73
74 #endif 74 #endif
75 75
76 } // namespace WTF 76 } // namespace WTF
77 77
78 #endif // WTF_BitwiseOperations_h 78 #endif // WTF_BitwiseOperations_h
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