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 29 const floatx80 floatx80Constant[] = { 30 { 0x0000000000000000ULL, 0x0000}, /* extended 0.0 */ 31 { 0x8000000000000000ULL, 0x3fff}, /* extended 1.0 */ 32 { 0x8000000000000000ULL, 0x4000}, /* extended 2.0 */ 33 { 0xc000000000000000ULL, 0x4000}, /* extended 3.0 */ 34 { 0x8000000000000000ULL, 0x4001}, /* extended 4.0 */ 35 { 0xa000000000000000ULL, 0x4001}, /* extended 5.0 */ 36 { 0x8000000000000000ULL, 0x3ffe}, /* extended 0.5 */ 37 { 0xa000000000000000ULL, 0x4002} /* extended 10.0 */ 38 }; 39 40 const 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 51 const 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 62 unsigned int getRegisterCount(const unsigned int opcode) 63 { 64 unsigned int nRc; 65 66 switch (opcode & MASK_REGISTER_COUNT) 67 { 68 case 0x00000000: nRc = 4; break; 69 case 0x00008000: nRc = 1; break; 70 case 0x00400000: nRc = 2; break; 71 case 0x00408000: nRc = 3; break; 72 default: nRc = 0; 73 } 74 75 return(nRc); 76 } 77 78 unsigned int getDestinationSize(const unsigned int opcode) 79 { 80 unsigned int nRc; 81 82 switch (opcode & MASK_DESTINATION_SIZE) 83 { 84 case 0x00000000: nRc = typeSingle; break; 85 case 0x00000080: nRc = typeDouble; break; 86 case 0x00080000: nRc = typeExtended; break; 87 default: nRc = typeNone; 88 } 89 90 return(nRc); 91 } 92 93 /* condition code lookup table 94 index into the table is test code: EQ, NE, ... LT, GT, AL, NV 95 bit position in short is condition code: NZCV */ 96 static const unsigned short aCC[16] = { 97 0xF0F0, // EQ == Z set 98 0x0F0F, // NE 99 0xCCCC, // CS == C set 100 0x3333, // CC 101 0xFF00, // MI == N set 102 0x00FF, // PL 103 0xAAAA, // VS == V set 104 0x5555, // VC 105 0x0C0C, // HI == C set && Z clear 106 0xF3F3, // LS == C clear || Z set 107 0xAA55, // GE == (N==V) 108 0x55AA, // LT == (N!=V) 109 0x0A05, // GT == (!Z && (N==V)) 110 0xF5FA, // LE == (Z || (N!=V)) 111 0xFFFF, // AL always 112 0 // NV 113 }; 114