/* NetWinder Floating Point Emulator (c) Rebel.COM, 1998,1999 Direct questions, comments to Scott Bambrough <scottb@netwinder.org> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "fpa11.h" #include "softfloat.h" #include "fpopcode.h" #include "fpsr.h" #include "fpmodule.h" #include "fpmodule.inl" const floatx80 floatx80Constant[] = { { 0x0000, 0x0000000000000000ULL}, /* extended 0.0 */ { 0x3fff, 0x8000000000000000ULL}, /* extended 1.0 */ { 0x4000, 0x8000000000000000ULL}, /* extended 2.0 */ { 0x4000, 0xc000000000000000ULL}, /* extended 3.0 */ { 0x4001, 0x8000000000000000ULL}, /* extended 4.0 */ { 0x4001, 0xa000000000000000ULL}, /* extended 5.0 */ { 0x3ffe, 0x8000000000000000ULL}, /* extended 0.5 */ { 0x4002, 0xa000000000000000ULL} /* extended 10.0 */ }; const float64 float64Constant[] = { 0x0000000000000000ULL, /* double 0.0 */ 0x3ff0000000000000ULL, /* double 1.0 */ 0x4000000000000000ULL, /* double 2.0 */ 0x4008000000000000ULL, /* double 3.0 */ 0x4010000000000000ULL, /* double 4.0 */ 0x4014000000000000ULL, /* double 5.0 */ 0x3fe0000000000000ULL, /* double 0.5 */ 0x4024000000000000ULL /* double 10.0 */ }; const float32 float32Constant[] = { 0x00000000, /* single 0.0 */ 0x3f800000, /* single 1.0 */ 0x40000000, /* single 2.0 */ 0x40400000, /* single 3.0 */ 0x40800000, /* single 4.0 */ 0x40a00000, /* single 5.0 */ 0x3f000000, /* single 0.5 */ 0x41200000 /* single 10.0 */ }; unsigned int getTransferLength(const unsigned int opcode) { unsigned int nRc; switch (opcode & MASK_TRANSFER_LENGTH) { case 0x00000000: nRc = 1; break; /* single precision */ case 0x00008000: nRc = 2; break; /* double precision */ case 0x00400000: nRc = 3; break; /* extended precision */ default: nRc = 0; } return(nRc); } unsigned int getRegisterCount(const unsigned int opcode) { unsigned int nRc; switch (opcode & MASK_REGISTER_COUNT) { case 0x00000000: nRc = 4; break; case 0x00008000: nRc = 1; break; case 0x00400000: nRc = 2; break; case 0x00408000: nRc = 3; break; default: nRc = 0; } return(nRc); } unsigned int getRoundingPrecision(const unsigned int opcode) { unsigned int nRc; switch (opcode & MASK_ROUNDING_PRECISION) { case 0x00000000: nRc = 1; break; case 0x00000080: nRc = 2; break; case 0x00080000: nRc = 3; break; default: nRc = 0; } return(nRc); } unsigned int getDestinationSize(const unsigned int opcode) { unsigned int nRc; switch (opcode & MASK_DESTINATION_SIZE) { case 0x00000000: nRc = typeSingle; break; case 0x00000080: nRc = typeDouble; break; case 0x00080000: nRc = typeExtended; break; default: nRc = typeNone; } return(nRc); } /* condition code lookup table index into the table is test code: EQ, NE, ... LT, GT, AL, NV bit position in short is condition code: NZCV */ static const unsigned short aCC[16] = { 0xF0F0, // EQ == Z set 0x0F0F, // NE 0xCCCC, // CS == C set 0x3333, // CC 0xFF00, // MI == N set 0x00FF, // PL 0xAAAA, // VS == V set 0x5555, // VC 0x0C0C, // HI == C set && Z clear 0xF3F3, // LS == C clear || Z set 0xAA55, // GE == (N==V) 0x55AA, // LT == (N!=V) 0x0A05, // GT == (!Z && (N==V)) 0xF5FA, // LE == (Z || (N!=V)) 0xFFFF, // AL always 0 // NV }; unsigned int checkCondition(const unsigned int opcode, const unsigned int ccodes) { return (aCC[opcode>>28] >> (ccodes>>28)) & 1; }