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  67. <div class="header">

  68.   <div class="headertitle">

  69. <div class="title">ScopedDenormalDisable.hpp</div>  </div>

  70. </div><!--header-->

  71. <div class="contents">

  72. <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div>

  73. <div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * DISTRHO Plugin Framework (DPF)</span></div>

  74. <div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * Copyright (C) 2012-2023 Filipe Coelho &lt;falktx@falktx.com&gt;</span></div>

  75. <div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> *</span></div>

  76. <div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * Permission to use, copy, modify, and/or distribute this software for any purpose with</span></div>

  77. <div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * or without fee is hereby granted, provided that the above copyright notice and this</span></div>

  78. <div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> * permission notice appear in all copies.</span></div>

  79. <div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> *</span></div>

  80. <div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> * THE SOFTWARE IS PROVIDED &quot;AS IS&quot; AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD</span></div>

  81. <div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN</span></div>

  82. <div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"> * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL</span></div>

  83. <div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"> * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER</span></div>

  84. <div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment"> * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN</span></div>

  85. <div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment"> * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>

  86. <div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment"> */</span></div>

  87. <div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160; </div>

  88. <div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#ifndef DISTRHO_SCOPED_DENORMAL_DISABLE_HPP_INCLUDED</span></div>

  89. <div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#define DISTRHO_SCOPED_DENORMAL_DISABLE_HPP_INCLUDED</span></div>

  90. <div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160; </div>

  91. <div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="preprocessor">#include &quot;../DistrhoUtils.hpp&quot;</span></div>

  92. <div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160; </div>

  93. <div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#ifdef __SSE2_MATH__</span></div>

  94. <div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="preprocessor"># include &lt;xmmintrin.h&gt;</span></div>

  95. <div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor">#endif</span></div>

  96. <div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160; </div>

  97. <div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<a class="code" href="group__NamespaceMacros.html#gac4cb97c393d20c28ba19365d844341cd">START_NAMESPACE_DISTRHO</a></div>

  98. <div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160; </div>

  99. <div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment">// --------------------------------------------------------------------------------------------------------------------</span></div>

  100. <div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment">// ScopedDenormalDisable class definition</span></div>

  101. <div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment"></span> </div>

  102. <div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment">/**</span></div>

  103. <div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment">   ScopedDenormalDisable is a handy class for disabling denormal numbers during a function scope.</span></div>

  104. <div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment">   Denormal numbers can happen in IIR or other types of filters, they are often very slow.</span></div>

  105. <div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="comment"></span> </div>

  106. <div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment">   Use this class with care! Messing up with the global state is bound to make some hosts unhappy.</span></div>

  107. <div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="comment"> */</span></div>

  108. <div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="classScopedDenormalDisable.html">   37</a></span>&#160;<span class="keyword">class </span><a class="code" href="classScopedDenormalDisable.html">ScopedDenormalDisable</a> {</div>

  109. <div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="keyword">public</span>:</div>

  110. <div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;    <span class="comment">/*</span></div>

  111. <div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="comment">     * Constructor.</span></div>

  112. <div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">     * Current cpu flags will saved, then denormals-as-zero and flush-to-zero set on top.</span></div>

  113. <div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment">     */</span></div>

  114. <div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;    <span class="keyword">inline</span> <a class="code" href="classScopedDenormalDisable.html">ScopedDenormalDisable</a>() noexcept;</div>

  115. <div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160; </div>

  116. <div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    <span class="comment">/*</span></div>

  117. <div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="comment">     * Destructor.</span></div>

  118. <div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="comment">     * CPU flags will be restored to the value obtained in the constructor.</span></div>

  119. <div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="comment">     */</span></div>

  120. <div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    <span class="keyword">inline</span> ~<a class="code" href="classScopedDenormalDisable.html">ScopedDenormalDisable</a>() noexcept</div>

  121. <div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;    {</div>

  122. <div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;        setFlags(oldflags);</div>

  123. <div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;    }</div>

  124. <div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160; </div>

  125. <div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="keyword">private</span>:</div>

  126. <div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="preprocessor">   #if defined(__SSE2_MATH__)</span></div>

  127. <div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    <span class="keyword">typedef</span> uint cpuflags_t;</div>

  128. <div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="preprocessor">   #elif defined(__aarch64__)</span></div>

  129. <div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;    <span class="keyword">typedef</span> uint64_t cpuflags_t;</div>

  130. <div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="preprocessor">   #elif defined(__arm__) &amp;&amp; !defined(__SOFTFP__)</span></div>

  131. <div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;    <span class="keyword">typedef</span> uint32_t cpuflags_t;</div>

  132. <div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="preprocessor">   #else</span></div>

  133. <div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;    <span class="keyword">typedef</span> <span class="keywordtype">char</span> cpuflags_t;</div>

  134. <div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="preprocessor">   #endif</span></div>

  135. <div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160; </div>

  136. <div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    <span class="comment">// retrieved on constructor, reset to it on destructor</span></div>

  137. <div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    cpuflags_t oldflags;</div>

  138. <div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160; </div>

  139. <div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    <span class="comment">// helper function to set cpu flags</span></div>

  140. <div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">void</span> setFlags(cpuflags_t flags) noexcept;</div>

  141. <div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160; </div>

  142. <div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;    DISTRHO_DECLARE_NON_COPYABLE(<a class="code" href="classScopedDenormalDisable.html">ScopedDenormalDisable</a>)</div>

  143. <div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    DISTRHO_PREVENT_HEAP_ALLOCATION</div>

  144. <div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;};</div>

  145. <div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160; </div>

  146. <div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<span class="comment">// --------------------------------------------------------------------------------------------------------------------</span></div>

  147. <div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="comment">// ScopedDenormalDisable class implementation</span></div>

  148. <div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160; </div>

  149. <div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="keyword">inline</span> ScopedDenormalDisable::ScopedDenormalDisable() noexcept</div>

  150. <div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    : oldflags(0)</div>

  151. <div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;{</div>

  152. <div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="preprocessor">   #if defined(__SSE2_MATH__)</span></div>

  153. <div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    oldflags = _mm_getcsr();</div>

  154. <div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    setFlags(oldflags | 0x8040);</div>

  155. <div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="preprocessor">   #elif defined(__aarch64__)</span></div>

  156. <div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    __asm__ __volatile__(<span class="stringliteral">&quot;mrs %0, fpcr&quot;</span> : <span class="stringliteral">&quot;=r&quot;</span> (oldflags));</div>

  157. <div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    setFlags(oldflags | 0x1000000);</div>

  158. <div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    __asm__ __volatile__(<span class="stringliteral">&quot;isb&quot;</span>);</div>

  159. <div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="preprocessor">   #elif defined(__arm__) &amp;&amp; !defined(__SOFTFP__)</span></div>

  160. <div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    __asm__ __volatile__(<span class="stringliteral">&quot;vmrs %0, fpscr&quot;</span> : <span class="stringliteral">&quot;=r&quot;</span> (oldflags));</div>

  161. <div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    setFlags(oldflags | 0x1000000);</div>

  162. <div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="preprocessor">   #endif</span></div>

  163. <div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;}</div>

  164. <div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160; </div>

  165. <div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> ScopedDenormalDisable::setFlags(<span class="keyword">const</span> cpuflags_t flags) noexcept</div>

  166. <div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;{</div>

  167. <div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;<span class="preprocessor">   #if defined(__SSE2_MATH__)</span></div>

  168. <div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;    _mm_setcsr(flags);</div>

  169. <div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;<span class="preprocessor">   #elif defined(__aarch64__)</span></div>

  170. <div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;    __asm__ __volatile__(<span class="stringliteral">&quot;msr fpcr, %0&quot;</span> :: <span class="stringliteral">&quot;r&quot;</span> (flags));</div>

  171. <div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="preprocessor">   #elif defined(__arm__) &amp;&amp; !defined(__SOFTFP__)</span></div>

  172. <div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    __asm__ __volatile__(<span class="stringliteral">&quot;vmsr fpscr, %0&quot;</span> :: <span class="stringliteral">&quot;r&quot;</span> (flags));</div>

  173. <div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;<span class="preprocessor">   #else</span></div>

  174. <div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;    <span class="comment">// unused</span></div>

  175. <div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    (void)flags;</div>

  176. <div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="preprocessor">   #endif</span></div>

  177. <div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;}</div>

  178. <div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160; </div>

  179. <div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;<span class="comment">// --------------------------------------------------------------------------------------------------------------------</span></div>

  180. <div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160; </div>

  181. <div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;<a class="code" href="group__NamespaceMacros.html#ga3ff541a449593e069a29e92d21e38ef3">END_NAMESPACE_DISTRHO</a></div>

  182. <div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160; </div>

  183. <div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;<span class="preprocessor">#endif </span><span class="comment">// DISTRHO_SCOPED_DENORMAL_DISABLE_HPP_INCLUDED</span></div>

  184. <div class="ttc" id="aclassScopedDenormalDisable_html"><div class="ttname"><a href="classScopedDenormalDisable.html">ScopedDenormalDisable</a></div><div class="ttdef"><b>Definition:</b> ScopedDenormalDisable.hpp:37</div></div>

  185. <div class="ttc" id="agroup__NamespaceMacros_html_ga3ff541a449593e069a29e92d21e38ef3"><div class="ttname"><a href="group__NamespaceMacros.html#ga3ff541a449593e069a29e92d21e38ef3">END_NAMESPACE_DISTRHO</a></div><div class="ttdeci">#define END_NAMESPACE_DISTRHO</div><div class="ttdef"><b>Definition:</b> DistrhoInfo.hpp:949</div></div>

  186. <div class="ttc" id="agroup__NamespaceMacros_html_gac4cb97c393d20c28ba19365d844341cd"><div class="ttname"><a href="group__NamespaceMacros.html#gac4cb97c393d20c28ba19365d844341cd">START_NAMESPACE_DISTRHO</a></div><div class="ttdeci">#define START_NAMESPACE_DISTRHO</div><div class="ttdef"><b>Definition:</b> DistrhoInfo.hpp:943</div></div>

  187. </div><!-- fragment --></div><!-- contents -->

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  190. Generated by&#160;<a href="https://www.doxygen.org/index.html"><img class="footer" src="doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.9.1

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