| /* |
| 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[] = { |
| { 0x0000000000000000ULL, 0x0000}, /* extended 0.0 */ |
| { 0x8000000000000000ULL, 0x3fff}, /* extended 1.0 */ |
| { 0x8000000000000000ULL, 0x4000}, /* extended 2.0 */ |
| { 0xc000000000000000ULL, 0x4000}, /* extended 3.0 */ |
| { 0x8000000000000000ULL, 0x4001}, /* extended 4.0 */ |
| { 0xa000000000000000ULL, 0x4001}, /* extended 5.0 */ |
| { 0x8000000000000000ULL, 0x3ffe}, /* extended 0.5 */ |
| { 0xa000000000000000ULL, 0x4002} /* 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 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 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 |
| }; |