| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | {0x0000, 0x0000000000000000ULL}, /* extended 0.0 */ |
| 33 | {0x3fff, 0x8000000000000000ULL}, /* extended 1.0 */ |
| 34 | {0x4000, 0x8000000000000000ULL}, /* extended 2.0 */ |
| 35 | {0x4000, 0xc000000000000000ULL}, /* extended 3.0 */ |
| 36 | {0x4001, 0x8000000000000000ULL}, /* extended 4.0 */ |
| 37 | {0x4001, 0xa000000000000000ULL}, /* extended 5.0 */ |
| 38 | {0x3ffe, 0x8000000000000000ULL}, /* extended 0.5 */ |
| 39 | {0x4002, 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 | } |