1 /* 2 NetWinder Floating Point Emulator 3 (c) Rebel.COM, 1998,1999 4 5 Direct questions, comments to Scott Bambrough <scottb@netwinder.org> 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #include "fpa11.h" 23 #include "softfloat.h" 24 #include "fpopcode.h" 25 26 floatx80 floatx80_exp(floatx80 Fm); 27 floatx80 floatx80_ln(floatx80 Fm); 28 floatx80 floatx80_sin(floatx80 rFm); 29 floatx80 floatx80_cos(floatx80 rFm); 30 floatx80 floatx80_arcsin(floatx80 rFm); 31 floatx80 floatx80_arctan(floatx80 rFm); 32 floatx80 floatx80_log(floatx80 rFm); 33 floatx80 floatx80_tan(floatx80 rFm); 34 floatx80 floatx80_arccos(floatx80 rFm); 35 floatx80 floatx80_pow(floatx80 rFn, floatx80 rFm); 36 floatx80 floatx80_pol(floatx80 rFn, floatx80 rFm); 37 38 static floatx80 floatx80_rsf(struct roundingData *roundData, floatx80 rFn, floatx80 rFm) 39 { 40 return floatx80_sub(roundData, rFm, rFn); 41 } 42 43 static floatx80 floatx80_rdv(struct roundingData *roundData, floatx80 rFn, floatx80 rFm) 44 { 45 return floatx80_div(roundData, rFm, rFn); 46 } 47 48 static floatx80 (*const dyadic_extended[16])(struct roundingData*, floatx80 rFn, floatx80 rFm) = { 49 [ADF_CODE >> 20] = floatx80_add, 50 [MUF_CODE >> 20] = floatx80_mul, 51 [SUF_CODE >> 20] = floatx80_sub, 52 [RSF_CODE >> 20] = floatx80_rsf, 53 [DVF_CODE >> 20] = floatx80_div, 54 [RDF_CODE >> 20] = floatx80_rdv, 55 [RMF_CODE >> 20] = floatx80_rem, 56 57 /* strictly, these opcodes should not be implemented */ 58 [FML_CODE >> 20] = floatx80_mul, 59 [FDV_CODE >> 20] = floatx80_div, 60 [FRD_CODE >> 20] = floatx80_rdv, 61 }; 62 63 static floatx80 floatx80_mvf(struct roundingData *roundData, floatx80 rFm) 64 { 65 return rFm; 66 } 67 68 static floatx80 floatx80_mnf(struct roundingData *roundData, floatx80 rFm) 69 { 70 rFm.high ^= 0x8000; 71 return rFm; 72 } 73 74 static floatx80 floatx80_abs(struct roundingData *roundData, floatx80 rFm) 75 { 76 rFm.high &= 0x7fff; 77 return rFm; 78 } 79 80 static floatx80 (*const monadic_extended[16])(struct roundingData*, floatx80 rFm) = { 81 [MVF_CODE >> 20] = floatx80_mvf, 82 [MNF_CODE >> 20] = floatx80_mnf, 83 [ABS_CODE >> 20] = floatx80_abs, 84 [RND_CODE >> 20] = floatx80_round_to_int, 85 [URD_CODE >> 20] = floatx80_round_to_int, 86 [SQT_CODE >> 20] = floatx80_sqrt, 87 [NRM_CODE >> 20] = floatx80_mvf, 88 }; 89 90 unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd) 91 { 92 FPA11 *fpa11 = GET_FPA11(); 93 floatx80 rFm; 94 unsigned int Fm, opc_mask_shift; 95 96 Fm = getFm(opcode); 97 if (CONSTANT_FM(opcode)) { 98 rFm = getExtendedConstant(Fm); 99 } else { 100 switch (fpa11->fType[Fm]) { 101 case typeSingle: 102 rFm = float32_to_floatx80(fpa11->fpreg[Fm].fSingle); 103 break; 104 105 case typeDouble: 106 rFm = float64_to_floatx80(fpa11->fpreg[Fm].fDouble); 107 break; 108 109 case typeExtended: 110 rFm = fpa11->fpreg[Fm].fExtended; 111 break; 112 113 default: 114 return 0; 115 } 116 } 117 118 opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20; 119 if (!MONADIC_INSTRUCTION(opcode)) { 120 unsigned int Fn = getFn(opcode); 121 floatx80 rFn; 122 123 switch (fpa11->fType[Fn]) { 124 case typeSingle: 125 rFn = float32_to_floatx80(fpa11->fpreg[Fn].fSingle); 126 break; 127 128 case typeDouble: 129 rFn = float64_to_floatx80(fpa11->fpreg[Fn].fDouble); 130 break; 131 132 case typeExtended: 133 rFn = fpa11->fpreg[Fn].fExtended; 134 break; 135 136 default: 137 return 0; 138 } 139 140 if (dyadic_extended[opc_mask_shift]) { 141 rFd->fExtended = dyadic_extended[opc_mask_shift](roundData, rFn, rFm); 142 } else { 143 return 0; 144 } 145 } else { 146 if (monadic_extended[opc_mask_shift]) { 147 rFd->fExtended = monadic_extended[opc_mask_shift](roundData, rFm); 148 } else { 149 return 0; 150 } 151 } 152 153 return 1; 154 } 155