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comparison: media/libopus/celt/float_cast.h
media/libopus/celt/float_cast.h
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| 1 /* Copyright (C) 2001 Erik de Castro Lopo <erikd AT mega-nerd DOT com> */ | |
| 2 /* | |
| 3 Redistribution and use in source and binary forms, with or without | |
| 4 modification, are permitted provided that the following conditions | |
| 5 are met: | |
| 6 | |
| 7 - Redistributions of source code must retain the above copyright | |
| 8 notice, this list of conditions and the following disclaimer. | |
| 9 | |
| 10 - Redistributions in binary form must reproduce the above copyright | |
| 11 notice, this list of conditions and the following disclaimer in the | |
| 12 documentation and/or other materials provided with the distribution. | |
| 13 | |
| 14 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 15 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 16 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 17 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER | |
| 18 OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 19 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 20 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 21 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| 22 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| 23 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 24 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 25 */ | |
| 26 | |
| 27 /* Version 1.1 */ | |
| 28 | |
| 29 #ifndef FLOAT_CAST_H | |
| 30 #define FLOAT_CAST_H | |
| 31 | |
| 32 | |
| 33 #include "arch.h" | |
| 34 | |
| 35 /*============================================================================ | |
| 36 ** On Intel Pentium processors (especially PIII and probably P4), converting | |
| 37 ** from float to int is very slow. To meet the C specs, the code produced by | |
| 38 ** most C compilers targeting Pentium needs to change the FPU rounding mode | |
| 39 ** before the float to int conversion is performed. | |
| 40 ** | |
| 41 ** Changing the FPU rounding mode causes the FPU pipeline to be flushed. It | |
| 42 ** is this flushing of the pipeline which is so slow. | |
| 43 ** | |
| 44 ** Fortunately the ISO C99 specifications define the functions lrint, lrintf, | |
| 45 ** llrint and llrintf which fix this problem as a side effect. | |
| 46 ** | |
| 47 ** On Unix-like systems, the configure process should have detected the | |
| 48 ** presence of these functions. If they weren't found we have to replace them | |
| 49 ** here with a standard C cast. | |
| 50 */ | |
| 51 | |
| 52 /* | |
| 53 ** The C99 prototypes for lrint and lrintf are as follows: | |
| 54 ** | |
| 55 ** long int lrintf (float x) ; | |
| 56 ** long int lrint (double x) ; | |
| 57 */ | |
| 58 | |
| 59 /* The presence of the required functions are detected during the configure | |
| 60 ** process and the values HAVE_LRINT and HAVE_LRINTF are set accordingly in | |
| 61 ** the config.h file. | |
| 62 */ | |
| 63 | |
| 64 #if (HAVE_LRINTF) | |
| 65 | |
| 66 /* These defines enable functionality introduced with the 1999 ISO C | |
| 67 ** standard. They must be defined before the inclusion of math.h to | |
| 68 ** engage them. If optimisation is enabled, these functions will be | |
| 69 ** inlined. With optimisation switched off, you have to link in the | |
| 70 ** maths library using -lm. | |
| 71 */ | |
| 72 | |
| 73 #define _ISOC9X_SOURCE 1 | |
| 74 #define _ISOC99_SOURCE 1 | |
| 75 | |
| 76 #define __USE_ISOC9X 1 | |
| 77 #define __USE_ISOC99 1 | |
| 78 | |
| 79 #include <math.h> | |
| 80 #define float2int(x) lrintf(x) | |
| 81 | |
| 82 #elif (defined(HAVE_LRINT)) | |
| 83 | |
| 84 #define _ISOC9X_SOURCE 1 | |
| 85 #define _ISOC99_SOURCE 1 | |
| 86 | |
| 87 #define __USE_ISOC9X 1 | |
| 88 #define __USE_ISOC99 1 | |
| 89 | |
| 90 #include <math.h> | |
| 91 #define float2int(x) lrint(x) | |
| 92 | |
| 93 #elif (defined(_MSC_VER) && _MSC_VER >= 1400) && (defined (WIN64) || defined (_WIN64)) | |
| 94 #include <xmmintrin.h> | |
| 95 | |
| 96 __inline long int float2int(float value) | |
| 97 { | |
| 98 return _mm_cvtss_si32(_mm_load_ss(&value)); | |
| 99 } | |
| 100 #elif (defined(_MSC_VER) && _MSC_VER >= 1400) && (defined (WIN32) || defined (_WIN32)) | |
| 101 #include <math.h> | |
| 102 | |
| 103 /* Win32 doesn't seem to have these functions. | |
| 104 ** Therefore implement OPUS_INLINE versions of these functions here. | |
| 105 */ | |
| 106 | |
| 107 __inline long int | |
| 108 float2int (float flt) | |
| 109 { int intgr; | |
| 110 | |
| 111 _asm | |
| 112 { fld flt | |
| 113 fistp intgr | |
| 114 } ; | |
| 115 | |
| 116 return intgr ; | |
| 117 } | |
| 118 | |
| 119 #else | |
| 120 | |
| 121 #if (defined(__GNUC__) && defined(__STDC__) && __STDC__ && __STDC_VERSION__ >= 199901L) | |
| 122 /* supported by gcc in C99 mode, but not by all other compilers */ | |
| 123 #warning "Don't have the functions lrint() and lrintf ()." | |
| 124 #warning "Replacing these functions with a standard C cast." | |
| 125 #endif /* __STDC_VERSION__ >= 199901L */ | |
| 126 #include <math.h> | |
| 127 #define float2int(flt) ((int)(floor(.5+flt))) | |
| 128 #endif | |
| 129 | |
| 130 #ifndef DISABLE_FLOAT_API | |
| 131 static OPUS_INLINE opus_int16 FLOAT2INT16(float x) | |
| 132 { | |
| 133 x = x*CELT_SIG_SCALE; | |
| 134 x = MAX32(x, -32768); | |
| 135 x = MIN32(x, 32767); | |
| 136 return (opus_int16)float2int(x); | |
| 137 } | |
| 138 #endif /* DISABLE_FLOAT_API */ | |
| 139 | |
| 140 #endif /* FLOAT_CAST_H */ |
