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 <linux/config.h> 23 #include "fpa11.h" 24 #include "softfloat.h" 25 #include "fpopcode.h" 26 #include "fpsr.h" 27 #include "fpmodule.h" 28 #include "fpmodule.inl" 29 30 #ifdef CONFIG_FPE_NWFPE_XP 31 const floatx80 floatx80Constant[] = { 32 { .high = 0x0000, .low = 0x0000000000000000ULL},/* extended 0.0 */ 33 { .high = 0x3fff, .low = 0x8000000000000000ULL},/* extended 1.0 */ 34 { .high = 0x4000, .low = 0x8000000000000000ULL},/* extended 2.0 */ 35 { .high = 0x4000, .low = 0xc000000000000000ULL},/* extended 3.0 */ 36 { .high = 0x4001, .low = 0x8000000000000000ULL},/* extended 4.0 */ 37 { .high = 0x4001, .low = 0xa000000000000000ULL},/* extended 5.0 */ 38 { .high = 0x3ffe, .low = 0x8000000000000000ULL},/* extended 0.5 */ 39 { .high = 0x4002, .low = 0xa000000000000000ULL},/* extended 10.0 */ 40 }; 41 #endif 42 43 const float64 float64Constant[] = { 44 0x0000000000000000ULL, /* double 0.0 */ 45 0x3ff0000000000000ULL, /* double 1.0 */ 46 0x4000000000000000ULL, /* double 2.0 */ 47 0x4008000000000000ULL, /* double 3.0 */ 48 0x4010000000000000ULL, /* double 4.0 */ 49 0x4014000000000000ULL, /* double 5.0 */ 50 0x3fe0000000000000ULL, /* double 0.5 */ 51 0x4024000000000000ULL /* double 10.0 */ 52 }; 53 54 const float32 float32Constant[] = { 55 0x00000000, /* single 0.0 */ 56 0x3f800000, /* single 1.0 */ 57 0x40000000, /* single 2.0 */ 58 0x40400000, /* single 3.0 */ 59 0x40800000, /* single 4.0 */ 60 0x40a00000, /* single 5.0 */ 61 0x3f000000, /* single 0.5 */ 62 0x41200000 /* single 10.0 */ 63 }; 64 65 /* condition code lookup table 66 index into the table is test code: EQ, NE, ... LT, GT, AL, NV 67 bit position in short is condition code: NZCV */ 68 static const unsigned short aCC[16] = { 69 0xF0F0, // EQ == Z set 70 0x0F0F, // NE 71 0xCCCC, // CS == C set 72 0x3333, // CC 73 0xFF00, // MI == N set 74 0x00FF, // PL 75 0xAAAA, // VS == V set 76 0x5555, // VC 77 0x0C0C, // HI == C set && Z clear 78 0xF3F3, // LS == C clear || Z set 79 0xAA55, // GE == (N==V) 80 0x55AA, // LT == (N!=V) 81 0x0A05, // GT == (!Z && (N==V)) 82 0xF5FA, // LE == (Z || (N!=V)) 83 0xFFFF, // AL always 84 0 // NV 85 }; 86 87 unsigned int checkCondition(const unsigned int opcode, const unsigned int ccodes) 88 { 89 return (aCC[opcode >> 28] >> (ccodes >> 28)) & 1; 90 } 91