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111
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1 /* Software floating-point emulation.
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2 Definitions for IEEE Single Precision.
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145
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3 Copyright (C) 1997-2019 Free Software Foundation, Inc.
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4 This file is part of the GNU C Library.
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5 Contributed by Richard Henderson (rth@cygnus.com),
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6 Jakub Jelinek (jj@ultra.linux.cz),
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7 David S. Miller (davem@redhat.com) and
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8 Peter Maydell (pmaydell@chiark.greenend.org.uk).
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9
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10 The GNU C Library is free software; you can redistribute it and/or
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11 modify it under the terms of the GNU Lesser General Public
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12 License as published by the Free Software Foundation; either
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13 version 2.1 of the License, or (at your option) any later version.
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14
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15 In addition to the permissions in the GNU Lesser General Public
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16 License, the Free Software Foundation gives you unlimited
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17 permission to link the compiled version of this file into
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18 combinations with other programs, and to distribute those
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19 combinations without any restriction coming from the use of this
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20 file. (The Lesser General Public License restrictions do apply in
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21 other respects; for example, they cover modification of the file,
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22 and distribution when not linked into a combine executable.)
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23
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24 The GNU C Library is distributed in the hope that it will be useful,
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25 but WITHOUT ANY WARRANTY; without even the implied warranty of
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26 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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27 Lesser General Public License for more details.
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28
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29 You should have received a copy of the GNU Lesser General Public
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30 License along with the GNU C Library; if not, see
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31 <http://www.gnu.org/licenses/>. */
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32
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33 #ifndef SOFT_FP_SINGLE_H
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34 #define SOFT_FP_SINGLE_H 1
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35
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36 #if _FP_W_TYPE_SIZE < 32
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37 # error "Here's a nickel kid. Go buy yourself a real computer."
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38 #endif
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39
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40 #define _FP_FRACTBITS_S _FP_W_TYPE_SIZE
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41
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42 #if _FP_W_TYPE_SIZE < 64
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43 # define _FP_FRACTBITS_DW_S (2 * _FP_W_TYPE_SIZE)
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44 #else
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45 # define _FP_FRACTBITS_DW_S _FP_W_TYPE_SIZE
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46 #endif
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47
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48 #define _FP_FRACBITS_S 24
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49 #define _FP_FRACXBITS_S (_FP_FRACTBITS_S - _FP_FRACBITS_S)
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50 #define _FP_WFRACBITS_S (_FP_WORKBITS + _FP_FRACBITS_S)
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51 #define _FP_WFRACXBITS_S (_FP_FRACTBITS_S - _FP_WFRACBITS_S)
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52 #define _FP_EXPBITS_S 8
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53 #define _FP_EXPBIAS_S 127
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54 #define _FP_EXPMAX_S 255
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55 #define _FP_QNANBIT_S ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-2))
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56 #define _FP_QNANBIT_SH_S ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-2+_FP_WORKBITS))
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57 #define _FP_IMPLBIT_S ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-1))
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58 #define _FP_IMPLBIT_SH_S ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-1+_FP_WORKBITS))
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59 #define _FP_OVERFLOW_S ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_S))
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60
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61 #define _FP_WFRACBITS_DW_S (2 * _FP_WFRACBITS_S)
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62 #define _FP_WFRACXBITS_DW_S (_FP_FRACTBITS_DW_S - _FP_WFRACBITS_DW_S)
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63 #define _FP_HIGHBIT_DW_S \
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64 ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_S - 1) % _FP_W_TYPE_SIZE)
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65
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66 /* The implementation of _FP_MUL_MEAT_S and _FP_DIV_MEAT_S should be
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67 chosen by the target machine. */
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68
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69 typedef float SFtype __attribute__ ((mode (SF)));
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70
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71 union _FP_UNION_S
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72 {
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73 SFtype flt;
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74 struct _FP_STRUCT_LAYOUT
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75 {
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76 #if __BYTE_ORDER == __BIG_ENDIAN
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77 unsigned sign : 1;
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78 unsigned exp : _FP_EXPBITS_S;
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79 unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
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80 #else
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81 unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
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82 unsigned exp : _FP_EXPBITS_S;
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83 unsigned sign : 1;
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84 #endif
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145
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85 } bits;
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86 };
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87
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88 #define FP_DECL_S(X) _FP_DECL (1, X)
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89 #define FP_UNPACK_RAW_S(X, val) _FP_UNPACK_RAW_1 (S, X, (val))
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90 #define FP_UNPACK_RAW_SP(X, val) _FP_UNPACK_RAW_1_P (S, X, (val))
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91 #define FP_PACK_RAW_S(val, X) _FP_PACK_RAW_1 (S, (val), X)
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92 #define FP_PACK_RAW_SP(val, X) \
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93 do \
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94 { \
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95 if (!FP_INHIBIT_RESULTS) \
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96 _FP_PACK_RAW_1_P (S, (val), X); \
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97 } \
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98 while (0)
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99
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100 #define FP_UNPACK_S(X, val) \
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101 do \
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102 { \
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103 _FP_UNPACK_RAW_1 (S, X, (val)); \
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104 _FP_UNPACK_CANONICAL (S, 1, X); \
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105 } \
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106 while (0)
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107
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108 #define FP_UNPACK_SP(X, val) \
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109 do \
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110 { \
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111 _FP_UNPACK_RAW_1_P (S, X, (val)); \
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112 _FP_UNPACK_CANONICAL (S, 1, X); \
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113 } \
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114 while (0)
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115
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116 #define FP_UNPACK_SEMIRAW_S(X, val) \
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117 do \
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118 { \
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119 _FP_UNPACK_RAW_1 (S, X, (val)); \
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120 _FP_UNPACK_SEMIRAW (S, 1, X); \
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121 } \
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122 while (0)
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123
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124 #define FP_UNPACK_SEMIRAW_SP(X, val) \
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125 do \
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126 { \
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127 _FP_UNPACK_RAW_1_P (S, X, (val)); \
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128 _FP_UNPACK_SEMIRAW (S, 1, X); \
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129 } \
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130 while (0)
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131
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132 #define FP_PACK_S(val, X) \
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133 do \
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134 { \
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135 _FP_PACK_CANONICAL (S, 1, X); \
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136 _FP_PACK_RAW_1 (S, (val), X); \
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137 } \
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138 while (0)
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139
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140 #define FP_PACK_SP(val, X) \
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141 do \
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142 { \
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143 _FP_PACK_CANONICAL (S, 1, X); \
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144 if (!FP_INHIBIT_RESULTS) \
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145 _FP_PACK_RAW_1_P (S, (val), X); \
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146 } \
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147 while (0)
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148
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149 #define FP_PACK_SEMIRAW_S(val, X) \
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150 do \
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151 { \
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152 _FP_PACK_SEMIRAW (S, 1, X); \
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153 _FP_PACK_RAW_1 (S, (val), X); \
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154 } \
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155 while (0)
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156
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157 #define FP_PACK_SEMIRAW_SP(val, X) \
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158 do \
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159 { \
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160 _FP_PACK_SEMIRAW (S, 1, X); \
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161 if (!FP_INHIBIT_RESULTS) \
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162 _FP_PACK_RAW_1_P (S, (val), X); \
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163 } \
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164 while (0)
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165
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166 #define FP_ISSIGNAN_S(X) _FP_ISSIGNAN (S, 1, X)
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167 #define FP_NEG_S(R, X) _FP_NEG (S, 1, R, X)
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168 #define FP_ADD_S(R, X, Y) _FP_ADD (S, 1, R, X, Y)
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169 #define FP_SUB_S(R, X, Y) _FP_SUB (S, 1, R, X, Y)
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170 #define FP_MUL_S(R, X, Y) _FP_MUL (S, 1, R, X, Y)
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171 #define FP_DIV_S(R, X, Y) _FP_DIV (S, 1, R, X, Y)
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172 #define FP_SQRT_S(R, X) _FP_SQRT (S, 1, R, X)
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173 #define _FP_SQRT_MEAT_S(R, S, T, X, Q) _FP_SQRT_MEAT_1 (R, S, T, X, (Q))
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174
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175 #if _FP_W_TYPE_SIZE < 64
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176 # define FP_FMA_S(R, X, Y, Z) _FP_FMA (S, 1, 2, R, X, Y, Z)
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177 #else
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178 # define FP_FMA_S(R, X, Y, Z) _FP_FMA (S, 1, 1, R, X, Y, Z)
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179 #endif
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180
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181 #define FP_CMP_S(r, X, Y, un, ex) _FP_CMP (S, 1, (r), X, Y, (un), (ex))
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182 #define FP_CMP_EQ_S(r, X, Y, ex) _FP_CMP_EQ (S, 1, (r), X, Y, (ex))
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183 #define FP_CMP_UNORD_S(r, X, Y, ex) _FP_CMP_UNORD (S, 1, (r), X, Y, (ex))
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184
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185 #define FP_TO_INT_S(r, X, rsz, rsg) _FP_TO_INT (S, 1, (r), X, (rsz), (rsg))
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186 #define FP_TO_INT_ROUND_S(r, X, rsz, rsg) \
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187 _FP_TO_INT_ROUND (S, 1, (r), X, (rsz), (rsg))
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188 #define FP_FROM_INT_S(X, r, rs, rt) _FP_FROM_INT (S, 1, X, (r), (rs), rt)
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189
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190 #define _FP_FRAC_HIGH_S(X) _FP_FRAC_HIGH_1 (X)
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191 #define _FP_FRAC_HIGH_RAW_S(X) _FP_FRAC_HIGH_1 (X)
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192
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193 #if _FP_W_TYPE_SIZE < 64
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194 # define _FP_FRAC_HIGH_DW_S(X) _FP_FRAC_HIGH_2 (X)
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195 #else
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196 # define _FP_FRAC_HIGH_DW_S(X) _FP_FRAC_HIGH_1 (X)
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197 #endif
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198
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199 #endif /* !SOFT_FP_SINGLE_H */
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