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1.1 root 1: /*
2: NetWinder Floating Point Emulator
3: (c) Rebel.COM, 1998,1999
4:
5: Direct questions, comments to Scott Bambrough <[email protected]>
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
1.1.1.3 root 18: along with this program; if not, see <http://www.gnu.org/licenses/>.
1.1 root 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[] = {
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 */
37: };
38:
39: const float64 float64Constant[] = {
1.1.1.4 ! root 40: const_float64(0x0000000000000000ULL), /* double 0.0 */
! 41: const_float64(0x3ff0000000000000ULL), /* double 1.0 */
! 42: const_float64(0x4000000000000000ULL), /* double 2.0 */
! 43: const_float64(0x4008000000000000ULL), /* double 3.0 */
! 44: const_float64(0x4010000000000000ULL), /* double 4.0 */
! 45: const_float64(0x4014000000000000ULL), /* double 5.0 */
! 46: const_float64(0x3fe0000000000000ULL), /* double 0.5 */
! 47: const_float64(0x4024000000000000ULL) /* double 10.0 */
1.1 root 48: };
49:
50: const float32 float32Constant[] = {
1.1.1.4 ! root 51: const_float32(0x00000000), /* single 0.0 */
! 52: const_float32(0x3f800000), /* single 1.0 */
! 53: const_float32(0x40000000), /* single 2.0 */
! 54: const_float32(0x40400000), /* single 3.0 */
! 55: const_float32(0x40800000), /* single 4.0 */
! 56: const_float32(0x40a00000), /* single 5.0 */
! 57: const_float32(0x3f000000), /* single 0.5 */
! 58: const_float32(0x41200000) /* single 10.0 */
1.1 root 59: };
60:
61: unsigned int getRegisterCount(const unsigned int opcode)
62: {
63: unsigned int nRc;
64:
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: }
73:
74: return(nRc);
75: }
76:
77: unsigned int getDestinationSize(const unsigned int opcode)
78: {
79: unsigned int nRc;
80:
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: }
88:
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: };
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