Mercurial > hg > CbC > CbC_gcc

annotate gcc/config/arm/fp16.c @ 67:f6334be47118

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
author nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
date Tue, 22 Mar 2011 17:18:12 +0900
parents 77e2b8dfacca
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
55
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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diff changeset
1 /* Half-float conversion routines.
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2
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3 Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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4 Contributed by CodeSourcery.
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5
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6 This file is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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8 Free Software Foundation; either version 3, or (at your option) any
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9 later version.
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10
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11 This file is distributed in the hope that it will be useful, but
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12 WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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14 General Public License for more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 static inline unsigned short
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26 __gnu_f2h_internal(unsigned int a, int ieee)
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27 {
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28 unsigned short sign = (a >> 16) & 0x8000;
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29 int aexp = (a >> 23) & 0xff;
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30 unsigned int mantissa = a & 0x007fffff;
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31 unsigned int mask;
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32 unsigned int increment;
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33
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34 if (aexp == 0xff)
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35 {
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36 if (!ieee)
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37 return sign;
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38 return sign | 0x7e00 | (mantissa >> 13);
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39 }
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40
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41 if (aexp == 0 && mantissa == 0)
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42 return sign;
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43
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44 aexp -= 127;
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45
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46 /* Decimal point between bits 22 and 23. */
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47 mantissa |= 0x00800000;
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48 if (aexp < -14)
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49 {
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50 mask = 0x007fffff;
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51 if (aexp < -25)
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52 aexp = -26;
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53 else if (aexp != -25)
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54 mask >>= 24 + aexp;
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55 }
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56 else
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57 mask = 0x00001fff;
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58
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59 /* Round. */
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60 if (mantissa & mask)
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61 {
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62 increment = (mask + 1) >> 1;
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63 if ((mantissa & mask) == increment)
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64 increment = mantissa & (increment << 1);
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65 mantissa += increment;
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66 if (mantissa >= 0x01000000)
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67 {
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68 mantissa >>= 1;
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69 aexp++;
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70 }
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71 }
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72
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73 if (ieee)
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74 {
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75 if (aexp > 15)
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76 return sign | 0x7c00;
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77 }
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78 else
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79 {
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80 if (aexp > 16)
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81 return sign | 0x7fff;
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82 }
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83
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84 if (aexp < -24)
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85 return sign;
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86
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87 if (aexp < -14)
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88 {
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89 mantissa >>= -14 - aexp;
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90 aexp = -14;
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91 }
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92
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93 /* We leave the leading 1 in the mantissa, and subtract one
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94 from the exponent bias to compensate. */
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95 return sign | (((aexp + 14) << 10) + (mantissa >> 13));
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96 }
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97
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98 unsigned int
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99 __gnu_h2f_internal(unsigned short a, int ieee)
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100 {
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101 unsigned int sign = (unsigned int)(a & 0x8000) << 16;
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102 int aexp = (a >> 10) & 0x1f;
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103 unsigned int mantissa = a & 0x3ff;
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104
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105 if (aexp == 0x1f && ieee)
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106 return sign | 0x7f800000 | (mantissa << 13);
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107
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108 if (aexp == 0)
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109 {
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110 int shift;
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111
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112 if (mantissa == 0)
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113 return sign;
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114
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115 shift = __builtin_clz(mantissa) - 21;
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116 mantissa <<= shift;
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117 aexp = -shift;
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118 }
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119
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120 return sign | (((aexp + 0x70) << 23) + (mantissa << 13));
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121 }
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122
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123 unsigned short
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124 __gnu_f2h_ieee(unsigned int a)
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125 {
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126 return __gnu_f2h_internal(a, 1);
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127 }
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128
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129 unsigned int
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130 __gnu_h2f_ieee(unsigned short a)
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131 {
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132 return __gnu_h2f_internal(a, 1);
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133 }
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134
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135 unsigned short
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136 __gnu_f2h_alternative(unsigned int x)
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137 {
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138 return __gnu_f2h_internal(x, 0);
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139 }
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140
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141 unsigned int
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142 __gnu_h2f_alternative(unsigned short a)
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143 {
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144 return __gnu_h2f_internal(a, 0);
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145 }