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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 | |
23 | #include "fpa11.h" |
24 | #include "fpopcode.h" |
25 | |
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); |
29 | |
30 | unsigned int EmulateCPDO(const unsigned int opcode) |
31 | { |
32 | FPA11 *fpa11 = GET_FPA11(); |
33 | FPREG *rFd; |
34 | unsigned int nType, nDest, nRc; |
35 | struct roundingData roundData; |
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 | |
43 | roundData.mode = SetRoundingMode(opcode); |
44 | roundData.precision = SetRoundingPrecision(opcode); |
45 | roundData.exception = 0; |
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: |
68 | nRc = SingleCPDO(&roundData, opcode, rFd); |
69 | break; |
70 | case typeDouble: |
71 | nRc = DoubleCPDO(&roundData, opcode, rFd); |
72 | break; |
73 | #ifdef CONFIG_FPE_NWFPE_XP |
74 | case typeExtended: |
75 | nRc = ExtendedCPDO(&roundData, opcode, rFd); |
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) |
98 | rFd->fSingle = float64_to_float32(&roundData, rFd->fDouble); |
99 | else |
100 | rFd->fSingle = floatx80_to_float32(&roundData, rFd->fExtended); |
101 | } |
102 | break; |
103 | |
104 | case typeDouble: |
105 | { |
106 | if (typeSingle == nType) |
107 | rFd->fDouble = float32_to_float64(rFd->fSingle); |
108 | else |
109 | rFd->fDouble = floatx80_to_float64(&roundData, rFd->fExtended); |
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) |
126 | rFd->fSingle = float64_to_float32(&roundData, rFd->fDouble); |
127 | else |
128 | rFd->fDouble = float32_to_float64(rFd->fSingle); |
129 | } |
130 | #endif |
131 | } |
132 | |
133 | if (roundData.exception) |
134 | float_raise(roundData.exception); |
135 | |
136 | return nRc; |
137 | } |
138 |
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