Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | NetWinder Floating Point Emulator | |
3 | (c) Rebel.COM, 1998,1999 | |
4 | (c) Philip Blundell, 2001 | |
5 | ||
6 | Direct questions, comments to Scott Bambrough <scottb@netwinder.org> | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | */ | |
22 | ||
1da177e4 LT |
23 | #include "fpa11.h" |
24 | #include "fpopcode.h" | |
25 | ||
f148af25 RP |
26 | unsigned int SingleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd); |
27 | unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd); | |
28 | unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd); | |
1da177e4 LT |
29 | |
30 | unsigned int EmulateCPDO(const unsigned int opcode) | |
31 | { | |
32 | FPA11 *fpa11 = GET_FPA11(); | |
33 | FPREG *rFd; | |
34 | unsigned int nType, nDest, nRc; | |
f148af25 | 35 | struct roundingData roundData; |
1da177e4 LT |
36 | |
37 | /* Get the destination size. If not valid let Linux perform | |
38 | an invalid instruction trap. */ | |
39 | nDest = getDestinationSize(opcode); | |
40 | if (typeNone == nDest) | |
41 | return 0; | |
42 | ||
f148af25 RP |
43 | roundData.mode = SetRoundingMode(opcode); |
44 | roundData.precision = SetRoundingPrecision(opcode); | |
45 | roundData.exception = 0; | |
1da177e4 LT |
46 | |
47 | /* Compare the size of the operands in Fn and Fm. | |
48 | Choose the largest size and perform operations in that size, | |
49 | in order to make use of all the precision of the operands. | |
50 | If Fm is a constant, we just grab a constant of a size | |
51 | matching the size of the operand in Fn. */ | |
52 | if (MONADIC_INSTRUCTION(opcode)) | |
53 | nType = nDest; | |
54 | else | |
55 | nType = fpa11->fType[getFn(opcode)]; | |
56 | ||
57 | if (!CONSTANT_FM(opcode)) { | |
58 | register unsigned int Fm = getFm(opcode); | |
59 | if (nType < fpa11->fType[Fm]) { | |
60 | nType = fpa11->fType[Fm]; | |
61 | } | |
62 | } | |
63 | ||
64 | rFd = &fpa11->fpreg[getFd(opcode)]; | |
65 | ||
66 | switch (nType) { | |
67 | case typeSingle: | |
f148af25 | 68 | nRc = SingleCPDO(&roundData, opcode, rFd); |
1da177e4 LT |
69 | break; |
70 | case typeDouble: | |
f148af25 | 71 | nRc = DoubleCPDO(&roundData, opcode, rFd); |
1da177e4 LT |
72 | break; |
73 | #ifdef CONFIG_FPE_NWFPE_XP | |
74 | case typeExtended: | |
f148af25 | 75 | nRc = ExtendedCPDO(&roundData, opcode, rFd); |
1da177e4 LT |
76 | break; |
77 | #endif | |
78 | default: | |
79 | nRc = 0; | |
80 | } | |
81 | ||
82 | /* The CPDO functions used to always set the destination type | |
83 | to be the same as their working size. */ | |
84 | ||
85 | if (nRc != 0) { | |
86 | /* If the operation succeeded, check to see if the result in the | |
87 | destination register is the correct size. If not force it | |
88 | to be. */ | |
89 | ||
90 | fpa11->fType[getFd(opcode)] = nDest; | |
91 | ||
92 | #ifdef CONFIG_FPE_NWFPE_XP | |
93 | if (nDest != nType) { | |
94 | switch (nDest) { | |
95 | case typeSingle: | |
96 | { | |
97 | if (typeDouble == nType) | |
f148af25 | 98 | rFd->fSingle = float64_to_float32(&roundData, rFd->fDouble); |
1da177e4 | 99 | else |
f148af25 | 100 | rFd->fSingle = floatx80_to_float32(&roundData, rFd->fExtended); |
1da177e4 LT |
101 | } |
102 | break; | |
103 | ||
104 | case typeDouble: | |
105 | { | |
106 | if (typeSingle == nType) | |
107 | rFd->fDouble = float32_to_float64(rFd->fSingle); | |
108 | else | |
f148af25 | 109 | rFd->fDouble = floatx80_to_float64(&roundData, rFd->fExtended); |
1da177e4 LT |
110 | } |
111 | break; | |
112 | ||
113 | case typeExtended: | |
114 | { | |
115 | if (typeSingle == nType) | |
116 | rFd->fExtended = float32_to_floatx80(rFd->fSingle); | |
117 | else | |
118 | rFd->fExtended = float64_to_floatx80(rFd->fDouble); | |
119 | } | |
120 | break; | |
121 | } | |
122 | } | |
123 | #else | |
124 | if (nDest != nType) { | |
125 | if (nDest == typeSingle) | |
f148af25 | 126 | rFd->fSingle = float64_to_float32(&roundData, rFd->fDouble); |
1da177e4 LT |
127 | else |
128 | rFd->fDouble = float32_to_float64(rFd->fSingle); | |
129 | } | |
130 | #endif | |
131 | } | |
132 | ||
f148af25 RP |
133 | if (roundData.exception) |
134 | float_raise(roundData.exception); | |
135 | ||
1da177e4 LT |
136 | return nRc; |
137 | } |