1 /* 2 NetWinder Floating Point Emulator 3 (c) Rebel.COM, 1998,1999 4 (c) Philip Blundell, 2001 5 6 Direct questions, comments to Scott Bambrough <scottb@netwinder.org> 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 */ 22 23 #include "fpa11.h" 24 #include "softfloat.h" 25 #include "fpopcode.h" 26 27 float32 float32_exp(float32 Fm); 28 float32 float32_ln(float32 Fm); 29 float32 float32_sin(float32 rFm); 30 float32 float32_cos(float32 rFm); 31 float32 float32_arcsin(float32 rFm); 32 float32 float32_arctan(float32 rFm); 33 float32 float32_log(float32 rFm); 34 float32 float32_tan(float32 rFm); 35 float32 float32_arccos(float32 rFm); 36 float32 float32_pow(float32 rFn, float32 rFm); 37 float32 float32_pol(float32 rFn, float32 rFm); 38 39 static float32 float32_rsf(struct roundingData *roundData, float32 rFn, float32 rFm) 40 { 41 return float32_sub(roundData, rFm, rFn); 42 } 43 44 static float32 float32_rdv(struct roundingData *roundData, float32 rFn, float32 rFm) 45 { 46 return float32_div(roundData, rFm, rFn); 47 } 48 49 static float32 (*const dyadic_single[16])(struct roundingData *, float32 rFn, float32 rFm) = { 50 [ADF_CODE >> 20] = float32_add, 51 [MUF_CODE >> 20] = float32_mul, 52 [SUF_CODE >> 20] = float32_sub, 53 [RSF_CODE >> 20] = float32_rsf, 54 [DVF_CODE >> 20] = float32_div, 55 [RDF_CODE >> 20] = float32_rdv, 56 [RMF_CODE >> 20] = float32_rem, 57 58 [FML_CODE >> 20] = float32_mul, 59 [FDV_CODE >> 20] = float32_div, 60 [FRD_CODE >> 20] = float32_rdv, 61 }; 62 63 static float32 float32_mvf(struct roundingData *roundData, float32 rFm) 64 { 65 return rFm; 66 } 67 68 static float32 float32_mnf(struct roundingData *roundData, float32 rFm) 69 { 70 return rFm ^ 0x80000000; 71 } 72 73 static float32 float32_abs(struct roundingData *roundData, float32 rFm) 74 { 75 return rFm & 0x7fffffff; 76 } 77 78 static float32 (*const monadic_single[16])(struct roundingData*, float32 rFm) = { 79 [MVF_CODE >> 20] = float32_mvf, 80 [MNF_CODE >> 20] = float32_mnf, 81 [ABS_CODE >> 20] = float32_abs, 82 [RND_CODE >> 20] = float32_round_to_int, 83 [URD_CODE >> 20] = float32_round_to_int, 84 [SQT_CODE >> 20] = float32_sqrt, 85 [NRM_CODE >> 20] = float32_mvf, 86 }; 87 88 unsigned int SingleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd) 89 { 90 FPA11 *fpa11 = GET_FPA11(); 91 float32 rFm; 92 unsigned int Fm, opc_mask_shift; 93 94 Fm = getFm(opcode); 95 if (CONSTANT_FM(opcode)) { 96 rFm = getSingleConstant(Fm); 97 } else if (fpa11->fType[Fm] == typeSingle) { 98 rFm = fpa11->fpreg[Fm].fSingle; 99 } else { 100 return 0; 101 } 102 103 opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20; 104 if (!MONADIC_INSTRUCTION(opcode)) { 105 unsigned int Fn = getFn(opcode); 106 float32 rFn; 107 108 if (fpa11->fType[Fn] == typeSingle && 109 dyadic_single[opc_mask_shift]) { 110 rFn = fpa11->fpreg[Fn].fSingle; 111 rFd->fSingle = dyadic_single[opc_mask_shift](roundData, rFn, rFm); 112 } else { 113 return 0; 114 } 115 } else { 116 if (monadic_single[opc_mask_shift]) { 117 rFd->fSingle = monadic_single[opc_mask_shift](roundData, rFm); 118 } else { 119 return 0; 120 } 121 } 122 123 return 1; 124 } 125