projects / qemu.git / blame
| Commit | Line | Data |
|---|---|---|
| 00406dff FB |
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 | |
| 70539e18 | 18 | along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 00406dff FB |
19 | */ |
| 20 | ||
| 21 | #include "fpa11.h" | |
| 22 | #include "softfloat.h" | |
| 23 | #include "fpopcode.h" | |
| 24 | #include "fpsr.h" | |
| 25 | //#include "fpmodule.h" | |
| 26 | //#include "fpmodule.inl" | |
| 27 | ||
| 28 | const floatx80 floatx80Constant[] = { | |
| 20495218 FB |
29 | { 0x0000000000000000ULL, 0x0000}, /* extended 0.0 */ |
| 30 | { 0x8000000000000000ULL, 0x3fff}, /* extended 1.0 */ | |
| 31 | { 0x8000000000000000ULL, 0x4000}, /* extended 2.0 */ | |
| 32 | { 0xc000000000000000ULL, 0x4000}, /* extended 3.0 */ | |
| 33 | { 0x8000000000000000ULL, 0x4001}, /* extended 4.0 */ | |
| 34 | { 0xa000000000000000ULL, 0x4001}, /* extended 5.0 */ | |
| 35 | { 0x8000000000000000ULL, 0x3ffe}, /* extended 0.5 */ | |
| 36 | { 0xa000000000000000ULL, 0x4002} /* extended 10.0 */ | |
| 3b46e624 | 37 | }; |
| 00406dff FB |
38 | |
| 39 | const float64 float64Constant[] = { | |
| 40 | 0x0000000000000000ULL, /* double 0.0 */ | |
| 41 | 0x3ff0000000000000ULL, /* double 1.0 */ | |
| 42 | 0x4000000000000000ULL, /* double 2.0 */ | |
| 43 | 0x4008000000000000ULL, /* double 3.0 */ | |
| 44 | 0x4010000000000000ULL, /* double 4.0 */ | |
| 45 | 0x4014000000000000ULL, /* double 5.0 */ | |
| 46 | 0x3fe0000000000000ULL, /* double 0.5 */ | |
| 47 | 0x4024000000000000ULL /* double 10.0 */ | |
| 3b46e624 | 48 | }; |
| 00406dff FB |
49 | |
| 50 | const float32 float32Constant[] = { | |
| 51 | 0x00000000, /* single 0.0 */ | |
| 52 | 0x3f800000, /* single 1.0 */ | |
| 53 | 0x40000000, /* single 2.0 */ | |
| 54 | 0x40400000, /* single 3.0 */ | |
| 55 | 0x40800000, /* single 4.0 */ | |
| 56 | 0x40a00000, /* single 5.0 */ | |
| 57 | 0x3f000000, /* single 0.5 */ | |
| 58 | 0x41200000 /* single 10.0 */ | |
| 3b46e624 | 59 | }; |
| 00406dff | 60 | |
| 00406dff FB |
61 | unsigned int getRegisterCount(const unsigned int opcode) |
| 62 | { | |
| 63 | unsigned int nRc; | |
| 3b46e624 | 64 | |
| 00406dff FB |
65 | switch (opcode & MASK_REGISTER_COUNT) |
| 66 | { | |
| 67 | case 0x00000000: nRc = 4; break; | |
| 68 | case 0x00008000: nRc = 1; break; | |
| 69 | case 0x00400000: nRc = 2; break; | |
| 70 | case 0x00408000: nRc = 3; break; | |
| 71 | default: nRc = 0; | |
| 72 | } | |
| 3b46e624 | 73 | |
| 00406dff FB |
74 | return(nRc); |
| 75 | } | |
| 76 | ||
| 00406dff FB |
77 | unsigned int getDestinationSize(const unsigned int opcode) |
| 78 | { | |
| 79 | unsigned int nRc; | |
| 3b46e624 | 80 | |
| 00406dff FB |
81 | switch (opcode & MASK_DESTINATION_SIZE) |
| 82 | { | |
| 83 | case 0x00000000: nRc = typeSingle; break; | |
| 84 | case 0x00000080: nRc = typeDouble; break; | |
| 85 | case 0x00080000: nRc = typeExtended; break; | |
| 86 | default: nRc = typeNone; | |
| 87 | } | |
| 3b46e624 | 88 | |
| 00406dff FB |
89 | return(nRc); |
| 90 | } | |
| 91 | ||
| 92 | /* condition code lookup table | |
| 93 | index into the table is test code: EQ, NE, ... LT, GT, AL, NV | |
| 94 | bit position in short is condition code: NZCV */ | |
| 95 | static const unsigned short aCC[16] = { | |
| 96 | 0xF0F0, // EQ == Z set | |
| 97 | 0x0F0F, // NE | |
| 98 | 0xCCCC, // CS == C set | |
| 99 | 0x3333, // CC | |
| 100 | 0xFF00, // MI == N set | |
| 101 | 0x00FF, // PL | |
| 102 | 0xAAAA, // VS == V set | |
| 103 | 0x5555, // VC | |
| 104 | 0x0C0C, // HI == C set && Z clear | |
| 105 | 0xF3F3, // LS == C clear || Z set | |
| 106 | 0xAA55, // GE == (N==V) | |
| 107 | 0x55AA, // LT == (N!=V) | |
| 108 | 0x0A05, // GT == (!Z && (N==V)) | |
| 109 | 0xF5FA, // LE == (Z || (N!=V)) | |
| 110 | 0xFFFF, // AL always | |
| 111 | 0 // NV | |
| 112 | }; |