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#include "fpsr.h" 26#include "fpmodule.h" 27#include "fpmodule.inl" 28 29const floatx80 floatx80Constant[] = { 30 { 0x0000, 0x0000000000000000ULL}, /* extended 0.0 */ 31 { 0x3fff, 0x8000000000000000ULL}, /* extended 1.0 */ 32 { 0x4000, 0x8000000000000000ULL}, /* extended 2.0 */ 33 { 0x4000, 0xc000000000000000ULL}, /* extended 3.0 */ 34 { 0x4001, 0x8000000000000000ULL}, /* extended 4.0 */ 35 { 0x4001, 0xa000000000000000ULL}, /* extended 5.0 */ 36 { 0x3ffe, 0x8000000000000000ULL}, /* extended 0.5 */ 37 { 0x4002, 0xa000000000000000ULL} /* extended 10.0 */ 38}; 39 40const float64 float64Constant[] = { 41 0x0000000000000000ULL, /* double 0.0 */ 42 0x3ff0000000000000ULL, /* double 1.0 */ 43 0x4000000000000000ULL, /* double 2.0 */ 44 0x4008000000000000ULL, /* double 3.0 */ 45 0x4010000000000000ULL, /* double 4.0 */ 46 0x4014000000000000ULL, /* double 5.0 */ 47 0x3fe0000000000000ULL, /* double 0.5 */ 48 0x4024000000000000ULL /* double 10.0 */ 49}; 50 51const float32 float32Constant[] = { 52 0x00000000, /* single 0.0 */ 53 0x3f800000, /* single 1.0 */ 54 0x40000000, /* single 2.0 */ 55 0x40400000, /* single 3.0 */ 56 0x40800000, /* single 4.0 */ 57 0x40a00000, /* single 5.0 */ 58 0x3f000000, /* single 0.5 */ 59 0x41200000 /* single 10.0 */ 60}; 61 62unsigned int getTransferLength(const unsigned int opcode) 63{ 64 unsigned int nRc; 65 66 switch (opcode & MASK_TRANSFER_LENGTH) 67 { 68 case 0x00000000: nRc = 1; break; /* single precision */ 69 case 0x00008000: nRc = 2; break; /* double precision */ 70 case 0x00400000: nRc = 3; break; /* extended precision */ 71 default: nRc = 0; 72 } 73 74 return(nRc); 75} 76 77unsigned int getRegisterCount(const unsigned int opcode) 78{ 79 unsigned int nRc; 80 81 switch (opcode & MASK_REGISTER_COUNT) 82 { 83 case 0x00000000: nRc = 4; break; 84 case 0x00008000: nRc = 1; break; 85 case 0x00400000: nRc = 2; break; 86 case 0x00408000: nRc = 3; break; 87 default: nRc = 0; 88 } 89 90 return(nRc); 91} 92 93unsigned int getRoundingPrecision(const unsigned int opcode) 94{ 95 unsigned int nRc; 96 97 switch (opcode & MASK_ROUNDING_PRECISION) 98 { 99 case 0x00000000: nRc = 1; break; 100 case 0x00000080: nRc = 2; break; 101 case 0x00080000: nRc = 3; break; 102 default: nRc = 0; 103 } 104 105 return(nRc); 106} 107 108unsigned int getDestinationSize(const unsigned int opcode) 109{ 110 unsigned int nRc; 111 112 switch (opcode & MASK_DESTINATION_SIZE) 113 { 114 case 0x00000000: nRc = typeSingle; break; 115 case 0x00000080: nRc = typeDouble; break; 116 case 0x00080000: nRc = typeExtended; break; 117 default: nRc = typeNone; 118 } 119 120 return(nRc); 121} 122 123/* condition code lookup table 124 index into the table is test code: EQ, NE, ... LT, GT, AL, NV 125 bit position in short is condition code: NZCV */ 126static const unsigned short aCC[16] = { 127 0xF0F0, // EQ == Z set 128 0x0F0F, // NE 129 0xCCCC, // CS == C set 130 0x3333, // CC 131 0xFF00, // MI == N set 132 0x00FF, // PL 133 0xAAAA, // VS == V set 134 0x5555, // VC 135 0x0C0C, // HI == C set && Z clear 136 0xF3F3, // LS == C clear || Z set 137 0xAA55, // GE == (N==V) 138 0x55AA, // LT == (N!=V) 139 0x0A05, // GT == (!Z && (N==V)) 140 0xF5FA, // LE == (Z || (N!=V)) 141 0xFFFF, // AL always 142 0 // NV 143}; 144 145unsigned int checkCondition(const unsigned int opcode, const unsigned int ccodes) 146{ 147 return (aCC[opcode>>28] >> (ccodes>>28)) & 1; 148} 149