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<div class="title">byte_swap.hpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>  </div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="preprocessor">#include "fly/fly.hpp"</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>  </div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include <cstdint></span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>  </div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#if defined(FLY_LINUX)</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor"># include <byteswap.h></span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#elif defined(FLY_MACOS)</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor"># include <libkern/OSByteOrder.h></span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#elif defined(FLY_WINDOWS)</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor"># include "fly/types/numeric/literals.hpp"</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  </div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor"># include <cstdlib></span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor"># include <type_traits></span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor"># error Unknown byte swapping includes.</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">namespace </span>fly::detail {</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  </div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#if defined(FLY_LINUX)</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  </div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> constexpr std::uint16_t byte_swap(std::uint16_t value)</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> {</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keywordflow">return</span> __builtin_bswap16(value);</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> }</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> constexpr std::uint32_t byte_swap(std::uint32_t value)</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> {</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordflow">return</span> __builtin_bswap32(value);</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> }</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  </div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> constexpr std::uint64_t byte_swap(std::uint64_t value)</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> {</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">return</span> __builtin_bswap64(value);</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> }</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#elif defined(FLY_MACOS)</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> constexpr std::uint16_t byte_swap(std::uint16_t value)</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> {</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">return</span> OSSwapInt16(value);</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> }</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  </div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> constexpr std::uint32_t byte_swap(std::uint32_t value)</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> {</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">return</span> OSSwapInt32(value);</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> }</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  </div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> constexpr std::uint64_t byte_swap(std::uint64_t value)</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> {</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">return</span> OSSwapInt64(value);</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> }</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  </div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor">#elif defined(FLY_WINDOWS)</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  </div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">// Built-in byte swapping methods on Windows are non-constexpr. To enable invoking byte swapping at</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment">// compile time, use shift-based byte swapping methods when evaluated in a constant context. See:</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">//</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment">// https://developercommunity.visualstudio.com/t/constexpr-byte-swapping-optimization/983963</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment">// https://developercommunity.visualstudio.com/t/Mark-some-built-in-functions-as-constexp/362558?entry=myfeedback&refTime=1620723793774&refUserId=f9653689-1bb1-4374-8703-3fb61971d3f5</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  </div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> constexpr std::uint16_t byte_swap(std::uint16_t value)</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> {</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordflow">if</span> (std::is_constant_evaluated())</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  {</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keyword">using namespace </span>fly::literals::numeric_literals;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  </div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">return</span> ((value & 0xff00_u16) >> 8) | ((value & 0x00ff_u16) << 8);</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  }</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  {</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">return</span> _byteswap_ushort(value);</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  }</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> }</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> constexpr std::uint32_t byte_swap(std::uint32_t value)</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> {</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">if</span> (std::is_constant_evaluated())</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  {</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keyword">using namespace </span>fly::literals::numeric_literals;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  </div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">return</span> (</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  ((value & 0xff00'0000_u32) >> 24) | ((value & 0x00ff'0000_u32) >> 8) |</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  ((value & 0x0000'ff00_u32) << 8) | ((value & 0x0000'00ff_u32) << 24));</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  }</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  {</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">return</span> _byteswap_ulong(value);</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  }</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> }</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  </div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> constexpr std::uint64_t byte_swap(std::uint64_t value)</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> {</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">if</span> (std::is_constant_evaluated())</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  {</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keyword">using namespace </span>fly::literals::numeric_literals;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  </div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">return</span> (</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  ((value & 0xff00'0000'0000'0000_u64) >> 56) |</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  ((value & 0x00ff'0000'0000'0000_u64) >> 40) |</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  ((value & 0x0000'ff00'0000'0000_u64) >> 24) |</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  ((value & 0x0000'00ff'0000'0000_u64) >> 8) |</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  ((value & 0x0000'0000'ff00'0000_u64) << 8) |</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  ((value & 0x0000'0000'00ff'0000_u64) << 24) |</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  ((value & 0x0000'0000'0000'ff00_u64) << 40) |</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  ((value & 0x0000'0000'0000'00ff_u64) << 56));</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  }</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  {</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">return</span> _byteswap_uint64(value);</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  }</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> }</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  </div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="preprocessor"># error Unknown byte swapping methods.</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  </div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> } <span class="comment">// namespace fly::detail</span></div>
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