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annotate include/llvm/Support/SwapByteOrder.h @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children afa8332a0e37
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1 //===- SwapByteOrder.h - Generic and optimized byte swaps -------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file declares generic and optimized functions to swap the byte order of
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11 // an integral type.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #ifndef LLVM_SUPPORT_SWAPBYTEORDER_H
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16 #define LLVM_SUPPORT_SWAPBYTEORDER_H
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17
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18 #include "llvm/Support/Compiler.h"
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19 #include "llvm/Support/DataTypes.h"
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20 #include <cstddef>
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21 #include <limits>
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22
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23 namespace llvm {
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24 namespace sys {
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25
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26 /// SwapByteOrder_16 - This function returns a byte-swapped representation of
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27 /// the 16-bit argument.
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28 inline uint16_t SwapByteOrder_16(uint16_t value) {
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29 #if defined(_MSC_VER) && !defined(_DEBUG)
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30 // The DLL version of the runtime lacks these functions (bug!?), but in a
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31 // release build they're replaced with BSWAP instructions anyway.
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32 return _byteswap_ushort(value);
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33 #else
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34 uint16_t Hi = value << 8;
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35 uint16_t Lo = value >> 8;
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36 return Hi | Lo;
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37 #endif
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38 }
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39
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40 /// SwapByteOrder_32 - This function returns a byte-swapped representation of
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41 /// the 32-bit argument.
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42 inline uint32_t SwapByteOrder_32(uint32_t value) {
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43 #if defined(__llvm__) || (LLVM_GNUC_PREREQ(4, 3, 0) && !defined(__ICC))
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44 return __builtin_bswap32(value);
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45 #elif defined(_MSC_VER) && !defined(_DEBUG)
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46 return _byteswap_ulong(value);
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47 #else
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48 uint32_t Byte0 = value & 0x000000FF;
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49 uint32_t Byte1 = value & 0x0000FF00;
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50 uint32_t Byte2 = value & 0x00FF0000;
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51 uint32_t Byte3 = value & 0xFF000000;
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52 return (Byte0 << 24) | (Byte1 << 8) | (Byte2 >> 8) | (Byte3 >> 24);
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53 #endif
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54 }
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55
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56 /// SwapByteOrder_64 - This function returns a byte-swapped representation of
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57 /// the 64-bit argument.
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58 inline uint64_t SwapByteOrder_64(uint64_t value) {
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59 #if defined(__llvm__) || (LLVM_GNUC_PREREQ(4, 3, 0) && !defined(__ICC))
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60 return __builtin_bswap64(value);
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61 #elif defined(_MSC_VER) && !defined(_DEBUG)
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62 return _byteswap_uint64(value);
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63 #else
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64 uint64_t Hi = SwapByteOrder_32(uint32_t(value));
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65 uint32_t Lo = SwapByteOrder_32(uint32_t(value >> 32));
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66 return (Hi << 32) | Lo;
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67 #endif
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68 }
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69
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70 inline unsigned char getSwappedBytes(unsigned char C) { return C; }
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71 inline signed char getSwappedBytes(signed char C) { return C; }
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72 inline char getSwappedBytes(char C) { return C; }
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73
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74 inline unsigned short getSwappedBytes(unsigned short C) { return SwapByteOrder_16(C); }
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75 inline signed short getSwappedBytes( signed short C) { return SwapByteOrder_16(C); }
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76
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77 inline unsigned int getSwappedBytes(unsigned int C) { return SwapByteOrder_32(C); }
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78 inline signed int getSwappedBytes( signed int C) { return SwapByteOrder_32(C); }
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79
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80 #if __LONG_MAX__ == __INT_MAX__
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81 inline unsigned long getSwappedBytes(unsigned long C) { return SwapByteOrder_32(C); }
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82 inline signed long getSwappedBytes( signed long C) { return SwapByteOrder_32(C); }
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83 #elif __LONG_MAX__ == __LONG_LONG_MAX__
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84 inline unsigned long getSwappedBytes(unsigned long C) { return SwapByteOrder_64(C); }
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85 inline signed long getSwappedBytes( signed long C) { return SwapByteOrder_64(C); }
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86 #else
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87 #error "Unknown long size!"
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88 #endif
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89
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90 inline unsigned long long getSwappedBytes(unsigned long long C) {
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91 return SwapByteOrder_64(C);
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92 }
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93 inline signed long long getSwappedBytes(signed long long C) {
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94 return SwapByteOrder_64(C);
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95 }
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96
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97 inline float getSwappedBytes(float C) {
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98 union {
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99 uint32_t i;
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100 float f;
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101 } in, out;
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102 in.f = C;
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103 out.i = SwapByteOrder_32(in.i);
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104 return out.f;
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105 }
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106
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107 inline float getSwappedBytes(double C) {
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108 union {
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109 uint64_t i;
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110 double d;
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111 } in, out;
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112 in.d = C;
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113 out.i = SwapByteOrder_64(in.i);
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114 return out.d;
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115 }
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116
77
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117 template<typename T>
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118 inline void swapByteOrder(T &Value) {
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119 Value = getSwappedBytes(Value);
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120 }
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121
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122 } // end namespace sys
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123 } // end namespace llvm
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124
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125 #endif