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annotate DPF-Prymula-audioplugins/dpf/distrho/extra/ScopedDenormalDisable.hpp @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
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3
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1 /*
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2 * DISTRHO Plugin Framework (DPF)
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3 * Copyright (C) 2012-2023 Filipe Coelho <falktx@falktx.com>
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4 *
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5 * Permission to use, copy, modify, and/or distribute this software for any purpose with
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6 * or without fee is hereby granted, provided that the above copyright notice and this
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7 * permission notice appear in all copies.
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8 *
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9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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10 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
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11 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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15 */
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16
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17 #ifndef DISTRHO_SCOPED_DENORMAL_DISABLE_HPP_INCLUDED
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18 #define DISTRHO_SCOPED_DENORMAL_DISABLE_HPP_INCLUDED
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19
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20 #include "../DistrhoUtils.hpp"
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21
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22 #ifdef __SSE2_MATH__
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23 # include <xmmintrin.h>
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24 #endif
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25
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26 START_NAMESPACE_DISTRHO
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27
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28 // --------------------------------------------------------------------------------------------------------------------
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29 // ScopedDenormalDisable class definition
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30
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31 /**
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32 ScopedDenormalDisable is a handy class for disabling denormal numbers during a function scope.
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33 Denormal numbers can happen in IIR or other types of filters, they are often very slow.
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34
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35 Use this class with care! Messing up with the global state is bound to make some hosts unhappy.
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36 */
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37 class ScopedDenormalDisable {
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38 public:
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39 /*
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40 * Constructor.
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41 * Current cpu flags will saved, then denormals-as-zero and flush-to-zero set on top.
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42 */
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43 inline ScopedDenormalDisable() noexcept;
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44
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45 /*
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46 * Destructor.
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47 * CPU flags will be restored to the value obtained in the constructor.
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48 */
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49 inline ~ScopedDenormalDisable() noexcept
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50 {
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51 setFlags(oldflags);
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52 }
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53
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54 private:
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55 #if defined(__SSE2_MATH__)
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56 typedef uint cpuflags_t;
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57 #elif defined(__aarch64__)
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58 typedef uint64_t cpuflags_t;
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59 #elif defined(__arm__) && !defined(__SOFTFP__)
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60 typedef uint32_t cpuflags_t;
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61 #else
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62 typedef char cpuflags_t;
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63 #endif
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64
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65 // retrieved on constructor, reset to it on destructor
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66 cpuflags_t oldflags;
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67
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68 // helper function to set cpu flags
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69 inline void setFlags(cpuflags_t flags) noexcept;
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70
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71 DISTRHO_DECLARE_NON_COPYABLE(ScopedDenormalDisable)
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72 DISTRHO_PREVENT_HEAP_ALLOCATION
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73 };
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74
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75 // --------------------------------------------------------------------------------------------------------------------
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76 // ScopedDenormalDisable class implementation
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77
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78 inline ScopedDenormalDisable::ScopedDenormalDisable() noexcept
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79 : oldflags(0)
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80 {
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81 #if defined(__SSE2_MATH__)
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82 oldflags = _mm_getcsr();
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83 setFlags(oldflags | 0x8040);
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84 #elif defined(__aarch64__)
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85 __asm__ __volatile__("mrs %0, fpcr" : "=r" (oldflags));
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86 setFlags(oldflags | 0x1000000);
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87 __asm__ __volatile__("isb");
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88 #elif defined(__arm__) && !defined(__SOFTFP__)
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89 __asm__ __volatile__("vmrs %0, fpscr" : "=r" (oldflags));
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90 setFlags(oldflags | 0x1000000);
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91 #endif
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92 }
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93
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94 inline void ScopedDenormalDisable::setFlags(const cpuflags_t flags) noexcept
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95 {
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96 #if defined(__SSE2_MATH__)
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97 _mm_setcsr(flags);
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98 #elif defined(__aarch64__)
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99 __asm__ __volatile__("msr fpcr, %0" :: "r" (flags));
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100 #elif defined(__arm__) && !defined(__SOFTFP__)
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101 __asm__ __volatile__("vmsr fpscr, %0" :: "r" (flags));
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102 #else
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103 // unused
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104 (void)flags;
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105 #endif
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106 }
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107
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108 // --------------------------------------------------------------------------------------------------------------------
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109
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110 END_NAMESPACE_DISTRHO
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111
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112 #endif // DISTRHO_SCOPED_DENORMAL_DISABLE_HPP_INCLUDED