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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 | |
70539e18 | 18 | along with this program; if not, see <http://www.gnu.org/licenses/>. |
00406dff FB |
19 | */ |
20 | ||
21 | #include "fpa11.h" | |
22 | #include "fpopcode.h" | |
23 | ||
00406dff FB |
24 | unsigned int EmulateCPDO(const unsigned int opcode) |
25 | { | |
26 | FPA11 *fpa11 = GET_FPA11(); | |
27 | unsigned int Fd, nType, nDest, nRc = 1; | |
3b46e624 | 28 | |
00406dff FB |
29 | //printk("EmulateCPDO(0x%08x)\n",opcode); |
30 | ||
31 | /* Get the destination size. If not valid let Linux perform | |
32 | an invalid instruction trap. */ | |
33 | nDest = getDestinationSize(opcode); | |
34 | if (typeNone == nDest) return 0; | |
3b46e624 | 35 | |
00406dff | 36 | SetRoundingMode(opcode); |
3b46e624 | 37 | |
00406dff FB |
38 | /* Compare the size of the operands in Fn and Fm. |
39 | Choose the largest size and perform operations in that size, | |
5fafdf24 TS |
40 | in order to make use of all the precision of the operands. |
41 | If Fm is a constant, we just grab a constant of a size | |
00406dff FB |
42 | matching the size of the operand in Fn. */ |
43 | if (MONADIC_INSTRUCTION(opcode)) | |
44 | nType = nDest; | |
45 | else | |
46 | nType = fpa11->fType[getFn(opcode)]; | |
3b46e624 | 47 | |
00406dff FB |
48 | if (!CONSTANT_FM(opcode)) |
49 | { | |
50 | register unsigned int Fm = getFm(opcode); | |
51 | if (nType < fpa11->fType[Fm]) | |
52 | { | |
53 | nType = fpa11->fType[Fm]; | |
54 | } | |
55 | } | |
56 | ||
57 | switch (nType) | |
58 | { | |
59 | case typeSingle : nRc = SingleCPDO(opcode); break; | |
60 | case typeDouble : nRc = DoubleCPDO(opcode); break; | |
61 | case typeExtended : nRc = ExtendedCPDO(opcode); break; | |
62 | default : nRc = 0; | |
63 | } | |
64 | ||
65 | /* If the operation succeeded, check to see if the result in the | |
66 | destination register is the correct size. If not force it | |
67 | to be. */ | |
68 | Fd = getFd(opcode); | |
69 | nType = fpa11->fType[Fd]; | |
70 | if ((0 != nRc) && (nDest != nType)) | |
71 | { | |
72 | switch (nDest) | |
73 | { | |
74 | case typeSingle: | |
75 | { | |
76 | if (typeDouble == nType) | |
5fafdf24 | 77 | fpa11->fpreg[Fd].fSingle = |
20495218 | 78 | float64_to_float32(fpa11->fpreg[Fd].fDouble, &fpa11->fp_status); |
00406dff | 79 | else |
5fafdf24 | 80 | fpa11->fpreg[Fd].fSingle = |
20495218 | 81 | floatx80_to_float32(fpa11->fpreg[Fd].fExtended, &fpa11->fp_status); |
00406dff FB |
82 | } |
83 | break; | |
3b46e624 | 84 | |
00406dff FB |
85 | case typeDouble: |
86 | { | |
87 | if (typeSingle == nType) | |
5fafdf24 | 88 | fpa11->fpreg[Fd].fDouble = |
20495218 | 89 | float32_to_float64(fpa11->fpreg[Fd].fSingle, &fpa11->fp_status); |
00406dff | 90 | else |
5fafdf24 | 91 | fpa11->fpreg[Fd].fDouble = |
20495218 | 92 | floatx80_to_float64(fpa11->fpreg[Fd].fExtended, &fpa11->fp_status); |
00406dff FB |
93 | } |
94 | break; | |
3b46e624 | 95 | |
00406dff FB |
96 | case typeExtended: |
97 | { | |
98 | if (typeSingle == nType) | |
5fafdf24 | 99 | fpa11->fpreg[Fd].fExtended = |
20495218 | 100 | float32_to_floatx80(fpa11->fpreg[Fd].fSingle, &fpa11->fp_status); |
00406dff | 101 | else |
5fafdf24 | 102 | fpa11->fpreg[Fd].fExtended = |
20495218 | 103 | float64_to_floatx80(fpa11->fpreg[Fd].fDouble, &fpa11->fp_status); |
00406dff FB |
104 | } |
105 | break; | |
106 | } | |
3b46e624 | 107 | |
00406dff FB |
108 | fpa11->fType[Fd] = nDest; |
109 | } | |
3b46e624 | 110 | |
00406dff FB |
111 | return nRc; |
112 | } |