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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm26/nwfpe/fpopcode.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/arm26/nwfpe/fpopcode.c')
-rw-r--r--arch/arm26/nwfpe/fpopcode.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/arch/arm26/nwfpe/fpopcode.c b/arch/arm26/nwfpe/fpopcode.c
new file mode 100644
index 000000000000..d81ddd188322
--- /dev/null
+++ b/arch/arm26/nwfpe/fpopcode.c
@@ -0,0 +1,148 @@
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
29const floatx80 floatx80Constant[] = {
30 { 0x0000, 0x0000000000000000ULL}, /* extended 0.0 */
31 { 0x3fff, 0x8000000000000000ULL}, /* extended 1.0 */
32 { 0x4000, 0x8000000000000000ULL}, /* extended 2.0 */
33 { 0x4000, 0xc000000000000000ULL}, /* extended 3.0 */
34 { 0x4001, 0x8000000000000000ULL}, /* extended 4.0 */
35 { 0x4001, 0xa000000000000000ULL}, /* extended 5.0 */
36 { 0x3ffe, 0x8000000000000000ULL}, /* extended 0.5 */
37 { 0x4002, 0xa000000000000000ULL} /* extended 10.0 */
38};
39
40const 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
51const 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
62unsigned int getTransferLength(const unsigned int opcode)
63{
64 unsigned int nRc;
65
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 }
73
74 return(nRc);
75}
76
77unsigned int getRegisterCount(const unsigned int opcode)
78{
79 unsigned int nRc;
80
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 }
89
90 return(nRc);
91}
92
93unsigned int getRoundingPrecision(const unsigned int opcode)
94{
95 unsigned int nRc;
96
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 }
104
105 return(nRc);
106}
107
108unsigned int getDestinationSize(const unsigned int opcode)
109{
110 unsigned int nRc;
111
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 }
119
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 */
126static 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
145unsigned int checkCondition(const unsigned int opcode, const unsigned int ccodes)
146{
147 return (aCC[opcode>>28] >> (ccodes>>28)) & 1;
148}