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annotate packages/language/c/libm/current/src/float/portable-api/sf_rint.c @ 3337:77f9d3253c3e

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Add: Complex number header and library (single and double precision floating point), port from Newlib. Add: Single precision floating point library, port from Newlib. [ Bugzilla 1001539 ]
author vae
date Sun, 25 Aug 2013 14:38:57 +0000
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1 //===========================================================================
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2 //
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3 // sf_rint.c
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4 //
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5 // Part of the standard mathematical function library
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6 //
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7 //===========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 2012 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //===========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s):
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43 // Contributors: visar, ilijak
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44 // Date: 2012-03-08
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45 // Purpose:
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46 // Description:
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47 // Usage:
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48 //
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49 //####DESCRIPTIONEND####
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50 //
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51 //===========================================================================
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52
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53 // CONFIGURATION
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54
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55 #include <pkgconf/libm.h> // Configuration header
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56
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57 // Include the Math library?
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58 #ifdef CYGPKG_LIBM
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59
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60 // Derived from code with the following copyright
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61
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62
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63 /* sf_rint.c -- float version of s_rint.c.
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64 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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65 */
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66
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67 /*
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68 * ====================================================
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69 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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70 *
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71 * Developed at SunPro, a Sun Microsystems, Inc. business.
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72 * Permission to use, copy, modify, and distribute this
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73 * software is freely granted, provided that this notice
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74 * is preserved.
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75 * ====================================================
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76 */
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77
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78
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79 #include "mathincl/fdlibm.h"
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80
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81 #ifdef __STDC__
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82 static const float
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83 #else
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84 static float
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85 #endif
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86 TWO23[2]={
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87 8.3886080000e+06, /* 0x4b000000 */
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88 -8.3886080000e+06, /* 0xcb000000 */
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89 };
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90
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91 #ifdef __STDC__
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92 float rintf(float x)
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93 #else
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94 float rintf(x)
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95 float x;
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96 #endif
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97 {
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98 __int32_t i0,j0,sx;
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99 __uint32_t i,i1,ix;
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100 float t;
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101 volatile float w;
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102 i0 = CYG_LIBM_WORD(x);
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103 sx = (i0>>31)&1;
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104 ix = (i0&0x7fffffff);
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105 j0 = (ix>>23)-0x7f;
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106 if(j0<23) {
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107 if(FLT_UWORD_IS_ZERO(ix))
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108 return x;
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109 if(j0<0) {
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110 i1 = (i0&0x07fffff);
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111 i0 &= 0xfff00000;
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112 i0 |= ((i1|-i1)>>9)&0x400000;
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113 SET_FLOAT_WORD(x,i0);
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114 w = TWO23[sx]+x;
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115 t = w-TWO23[sx];
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116 i0 = CYG_LIBM_WORD(t);
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117 SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31));
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118 return t;
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119 } else {
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120 i = (0x007fffff)>>j0;
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121 if((i0&i)==0) return x; /* x is integral */
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122 i>>=1;
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123 if((i0&i)!=0) i0 = (i0&(~i))|((0x200000)>>j0);
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124 }
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125 } else {
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126 if(!FLT_UWORD_IS_FINITE(ix)) return x+x; /* inf or NaN */
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127 else
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128 return x; /* x is integral */
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129 }
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130 SET_FLOAT_WORD(x,i0);
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131 w = TWO23[sx]+x;
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132 return w-TWO23[sx];
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133 }
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134
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135 #endif // ifdef CYGPKG_LIBM
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136
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137 // EOF sf_rint.c