fpopcode.c (3016B)
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, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include "qemu/osdep.h" 22 #include "fpa11.h" 23 #include "fpu/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 const_float64(0x0000000000000000ULL), /* double 0.0 */ 42 const_float64(0x3ff0000000000000ULL), /* double 1.0 */ 43 const_float64(0x4000000000000000ULL), /* double 2.0 */ 44 const_float64(0x4008000000000000ULL), /* double 3.0 */ 45 const_float64(0x4010000000000000ULL), /* double 4.0 */ 46 const_float64(0x4014000000000000ULL), /* double 5.0 */ 47 const_float64(0x3fe0000000000000ULL), /* double 0.5 */ 48 const_float64(0x4024000000000000ULL) /* double 10.0 */ 49 }; 50 51 const float32 float32Constant[] = { 52 const_float32(0x00000000), /* single 0.0 */ 53 const_float32(0x3f800000), /* single 1.0 */ 54 const_float32(0x40000000), /* single 2.0 */ 55 const_float32(0x40400000), /* single 3.0 */ 56 const_float32(0x40800000), /* single 4.0 */ 57 const_float32(0x40a00000), /* single 5.0 */ 58 const_float32(0x3f000000), /* single 0.5 */ 59 const_float32(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 }