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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
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 "fpa11.h"
23: #include "softfloat.h"
24: #include "fpopcode.h"
25: #include "fpsr.h"
26: //#include "fpmodule.h"
27: //#include "fpmodule.inl"
28:
29: const floatx80 floatx80Constant[] = {
30: { 0x0000000000000000ULL, 0x0000}, /* extended 0.0 */
31: { 0x8000000000000000ULL, 0x3fff}, /* extended 1.0 */
32: { 0x8000000000000000ULL, 0x4000}, /* extended 2.0 */
33: { 0xc000000000000000ULL, 0x4000}, /* extended 3.0 */
34: { 0x8000000000000000ULL, 0x4001}, /* extended 4.0 */
35: { 0xa000000000000000ULL, 0x4001}, /* extended 5.0 */
36: { 0x8000000000000000ULL, 0x3ffe}, /* extended 0.5 */
37: { 0xa000000000000000ULL, 0x4002} /* extended 10.0 */
38: };
39:
40: const float64 float64Constant[] = {
41: 0x0000000000000000ULL, /* double 0.0 */
42: 0x3ff0000000000000ULL, /* double 1.0 */
43: 0x4000000000000000ULL, /* double 2.0 */
44: 0x4008000000000000ULL, /* double 3.0 */
45: 0x4010000000000000ULL, /* double 4.0 */
46: 0x4014000000000000ULL, /* double 5.0 */
47: 0x3fe0000000000000ULL, /* double 0.5 */
48: 0x4024000000000000ULL /* double 10.0 */
49: };
50:
51: const float32 float32Constant[] = {
52: 0x00000000, /* single 0.0 */
53: 0x3f800000, /* single 1.0 */
54: 0x40000000, /* single 2.0 */
55: 0x40400000, /* single 3.0 */
56: 0x40800000, /* single 4.0 */
57: 0x40a00000, /* single 5.0 */
58: 0x3f000000, /* single 0.5 */
59: 0x41200000 /* single 10.0 */
60: };
61:
62: unsigned int getRegisterCount(const unsigned int opcode)
63: {
64: unsigned int nRc;
65:
66: switch (opcode & MASK_REGISTER_COUNT)
67: {
68: case 0x00000000: nRc = 4; break;
69: case 0x00008000: nRc = 1; break;
70: case 0x00400000: nRc = 2; break;
71: case 0x00408000: nRc = 3; break;
72: default: nRc = 0;
73: }
74:
75: return(nRc);
76: }
77:
78: unsigned int getDestinationSize(const unsigned int opcode)
79: {
80: unsigned int nRc;
81:
82: switch (opcode & MASK_DESTINATION_SIZE)
83: {
84: case 0x00000000: nRc = typeSingle; break;
85: case 0x00000080: nRc = typeDouble; break;
86: case 0x00080000: nRc = typeExtended; break;
87: default: nRc = typeNone;
88: }
89:
90: return(nRc);
91: }
92:
93: /* condition code lookup table
94: index into the table is test code: EQ, NE, ... LT, GT, AL, NV
95: bit position in short is condition code: NZCV */
96: static const unsigned short aCC[16] = {
97: 0xF0F0, // EQ == Z set
98: 0x0F0F, // NE
99: 0xCCCC, // CS == C set
100: 0x3333, // CC
101: 0xFF00, // MI == N set
102: 0x00FF, // PL
103: 0xAAAA, // VS == V set
104: 0x5555, // VC
105: 0x0C0C, // HI == C set && Z clear
106: 0xF3F3, // LS == C clear || Z set
107: 0xAA55, // GE == (N==V)
108: 0x55AA, // LT == (N!=V)
109: 0x0A05, // GT == (!Z && (N==V))
110: 0xF5FA, // LE == (Z || (N!=V))
111: 0xFFFF, // AL always
112: 0 // NV
113: };
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