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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 "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[] = { | |
20495218 FB |
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 */ | |
5fafdf24 | 38 | }; |
00406dff FB |
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 */ | |
5fafdf24 | 49 | }; |
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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 */ | |
5fafdf24 | 60 | }; |
00406dff FB |
61 | |
62 | unsigned int getTransferLength(const unsigned int opcode) | |
63 | { | |
64 | unsigned int nRc; | |
5fafdf24 | 65 | |
00406dff FB |
66 | switch (opcode & MASK_TRANSFER_LENGTH) |
67 | { | |
68 | case 0x00000000: nRc = 1; break; /* single precision */ | |
69 | case 0x00008000: nRc = 2; break; /* double precision */ | |
70 | case 0x00400000: nRc = 3; break; /* extended precision */ | |
71 | default: nRc = 0; | |
72 | } | |
5fafdf24 | 73 | |
00406dff FB |
74 | return(nRc); |
75 | } | |
76 | ||
77 | unsigned int getRegisterCount(const unsigned int opcode) | |
78 | { | |
79 | unsigned int nRc; | |
5fafdf24 | 80 | |
00406dff FB |
81 | switch (opcode & MASK_REGISTER_COUNT) |
82 | { | |
83 | case 0x00000000: nRc = 4; break; | |
84 | case 0x00008000: nRc = 1; break; | |
85 | case 0x00400000: nRc = 2; break; | |
86 | case 0x00408000: nRc = 3; break; | |
87 | default: nRc = 0; | |
88 | } | |
5fafdf24 | 89 | |
00406dff FB |
90 | return(nRc); |
91 | } | |
92 | ||
93 | unsigned int getRoundingPrecision(const unsigned int opcode) | |
94 | { | |
95 | unsigned int nRc; | |
5fafdf24 | 96 | |
00406dff FB |
97 | switch (opcode & MASK_ROUNDING_PRECISION) |
98 | { | |
99 | case 0x00000000: nRc = 1; break; | |
100 | case 0x00000080: nRc = 2; break; | |
101 | case 0x00080000: nRc = 3; break; | |
102 | default: nRc = 0; | |
103 | } | |
5fafdf24 | 104 | |
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105 | return(nRc); |
106 | } | |
107 | ||
108 | unsigned int getDestinationSize(const unsigned int opcode) | |
109 | { | |
110 | unsigned int nRc; | |
5fafdf24 | 111 | |
00406dff FB |
112 | switch (opcode & MASK_DESTINATION_SIZE) |
113 | { | |
114 | case 0x00000000: nRc = typeSingle; break; | |
115 | case 0x00000080: nRc = typeDouble; break; | |
116 | case 0x00080000: nRc = typeExtended; break; | |
117 | default: nRc = typeNone; | |
118 | } | |
5fafdf24 | 119 | |
00406dff FB |
120 | return(nRc); |
121 | } | |
122 | ||
123 | /* condition code lookup table | |
124 | index into the table is test code: EQ, NE, ... LT, GT, AL, NV | |
125 | bit position in short is condition code: NZCV */ | |
126 | static const unsigned short aCC[16] = { | |
127 | 0xF0F0, // EQ == Z set | |
128 | 0x0F0F, // NE | |
129 | 0xCCCC, // CS == C set | |
130 | 0x3333, // CC | |
131 | 0xFF00, // MI == N set | |
132 | 0x00FF, // PL | |
133 | 0xAAAA, // VS == V set | |
134 | 0x5555, // VC | |
135 | 0x0C0C, // HI == C set && Z clear | |
136 | 0xF3F3, // LS == C clear || Z set | |
137 | 0xAA55, // GE == (N==V) | |
138 | 0x55AA, // LT == (N!=V) | |
139 | 0x0A05, // GT == (!Z && (N==V)) | |
140 | 0xF5FA, // LE == (Z || (N!=V)) | |
141 | 0xFFFF, // AL always | |
142 | 0 // NV | |
143 | }; | |
144 | ||
145 | unsigned int checkCondition(const unsigned int opcode, const unsigned int ccodes) | |
146 | { | |
147 | return (aCC[opcode>>28] >> (ccodes>>28)) & 1; | |
148 | } |