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1 /* |
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2 NetWinder Floating Point Emulator |
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3 (c) Rebel.COM, 1998,1999 |
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4 |
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5 Direct questions, comments to Scott Bambrough <scottb@netwinder.org> |
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6 |
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7 This program is free software; you can redistribute it and/or modify |
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8 it under the terms of the GNU General Public License as published by |
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9 the Free Software Foundation; either version 2 of the License, or |
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10 (at your option) any later version. |
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11 |
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12 This program is distributed in the hope that it will be useful, |
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 GNU General Public License for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with this program; if not, write to the Free Software |
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19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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20 */ |
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21 |
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22 #include "fpa11.h" |
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23 #include "softfloat.h" |
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24 #include "fpopcode.h" |
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25 #include "fpsr.h" |
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26 //#include "fpmodule.h" |
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27 //#include "fpmodule.inl" |
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28 |
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29 const floatx80 floatx80Constant[] = { |
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30 { 0x0000000000000000ULL, 0x0000}, /* extended 0.0 */ |
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31 { 0x8000000000000000ULL, 0x3fff}, /* extended 1.0 */ |
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32 { 0x8000000000000000ULL, 0x4000}, /* extended 2.0 */ |
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33 { 0xc000000000000000ULL, 0x4000}, /* extended 3.0 */ |
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34 { 0x8000000000000000ULL, 0x4001}, /* extended 4.0 */ |
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35 { 0xa000000000000000ULL, 0x4001}, /* extended 5.0 */ |
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36 { 0x8000000000000000ULL, 0x3ffe}, /* extended 0.5 */ |
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37 { 0xa000000000000000ULL, 0x4002} /* extended 10.0 */ |
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38 }; |
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39 |
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40 const float64 float64Constant[] = { |
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41 0x0000000000000000ULL, /* double 0.0 */ |
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42 0x3ff0000000000000ULL, /* double 1.0 */ |
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43 0x4000000000000000ULL, /* double 2.0 */ |
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44 0x4008000000000000ULL, /* double 3.0 */ |
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45 0x4010000000000000ULL, /* double 4.0 */ |
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46 0x4014000000000000ULL, /* double 5.0 */ |
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47 0x3fe0000000000000ULL, /* double 0.5 */ |
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48 0x4024000000000000ULL /* double 10.0 */ |
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49 }; |
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50 |
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51 const float32 float32Constant[] = { |
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52 0x00000000, /* single 0.0 */ |
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53 0x3f800000, /* single 1.0 */ |
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54 0x40000000, /* single 2.0 */ |
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55 0x40400000, /* single 3.0 */ |
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56 0x40800000, /* single 4.0 */ |
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57 0x40a00000, /* single 5.0 */ |
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58 0x3f000000, /* single 0.5 */ |
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59 0x41200000 /* single 10.0 */ |
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60 }; |
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61 |
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62 unsigned int getTransferLength(const unsigned int opcode) |
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63 { |
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64 unsigned int nRc; |
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65 |
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66 switch (opcode & MASK_TRANSFER_LENGTH) |
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67 { |
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68 case 0x00000000: nRc = 1; break; /* single precision */ |
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69 case 0x00008000: nRc = 2; break; /* double precision */ |
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70 case 0x00400000: nRc = 3; break; /* extended precision */ |
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71 default: nRc = 0; |
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72 } |
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73 |
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74 return(nRc); |
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75 } |
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76 |
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77 unsigned int getRegisterCount(const unsigned int opcode) |
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78 { |
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79 unsigned int nRc; |
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80 |
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81 switch (opcode & MASK_REGISTER_COUNT) |
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82 { |
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83 case 0x00000000: nRc = 4; break; |
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84 case 0x00008000: nRc = 1; break; |
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85 case 0x00400000: nRc = 2; break; |
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86 case 0x00408000: nRc = 3; break; |
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87 default: nRc = 0; |
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88 } |
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89 |
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90 return(nRc); |
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91 } |
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92 |
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93 unsigned int getRoundingPrecision(const unsigned int opcode) |
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94 { |
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95 unsigned int nRc; |
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96 |
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97 switch (opcode & MASK_ROUNDING_PRECISION) |
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98 { |
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99 case 0x00000000: nRc = 1; break; |
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100 case 0x00000080: nRc = 2; break; |
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101 case 0x00080000: nRc = 3; break; |
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102 default: nRc = 0; |
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103 } |
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104 |
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105 return(nRc); |
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106 } |
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107 |
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108 unsigned int getDestinationSize(const unsigned int opcode) |
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109 { |
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110 unsigned int nRc; |
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111 |
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112 switch (opcode & MASK_DESTINATION_SIZE) |
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113 { |
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114 case 0x00000000: nRc = typeSingle; break; |
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115 case 0x00000080: nRc = typeDouble; break; |
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116 case 0x00080000: nRc = typeExtended; break; |
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117 default: nRc = typeNone; |
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118 } |
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119 |
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120 return(nRc); |
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121 } |
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122 |
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123 /* condition code lookup table |
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124 index into the table is test code: EQ, NE, ... LT, GT, AL, NV |
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125 bit position in short is condition code: NZCV */ |
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126 static const unsigned short aCC[16] = { |
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127 0xF0F0, // EQ == Z set |
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128 0x0F0F, // NE |
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129 0xCCCC, // CS == C set |
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130 0x3333, // CC |
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131 0xFF00, // MI == N set |
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132 0x00FF, // PL |
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133 0xAAAA, // VS == V set |
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134 0x5555, // VC |
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135 0x0C0C, // HI == C set && Z clear |
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136 0xF3F3, // LS == C clear || Z set |
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137 0xAA55, // GE == (N==V) |
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138 0x55AA, // LT == (N!=V) |
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139 0x0A05, // GT == (!Z && (N==V)) |
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140 0xF5FA, // LE == (Z || (N!=V)) |
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141 0xFFFF, // AL always |
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142 0 // NV |
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143 }; |
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144 |
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145 unsigned int checkCondition(const unsigned int opcode, const unsigned int ccodes) |
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146 { |
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147 return (aCC[opcode>>28] >> (ccodes>>28)) & 1; |
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148 } |