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 #ifdef CONFIG_FPE_NWFPE_XP
30 const floatx80 floatx80Constant[] = {
31 { .high = 0x0000, .low = 0x0000000000000000ULL},/* extended 0.0 */
32 { .high = 0x3fff, .low = 0x8000000000000000ULL},/* extended 1.0 */
33 { .high = 0x4000, .low = 0x8000000000000000ULL},/* extended 2.0 */
34 { .high = 0x4000, .low = 0xc000000000000000ULL},/* extended 3.0 */
35 { .high = 0x4001, .low = 0x8000000000000000ULL},/* extended 4.0 */
36 { .high = 0x4001, .low = 0xa000000000000000ULL},/* extended 5.0 */
37 { .high = 0x3ffe, .low = 0x8000000000000000ULL},/* extended 0.5 */
38 { .high = 0x4002, .low = 0xa000000000000000ULL},/* extended 10.0 */
39 };
40 #endif
41
42 const float64 float64Constant[] = {
43 0x0000000000000000ULL, /* double 0.0 */
44 0x3ff0000000000000ULL, /* double 1.0 */
45 0x4000000000000000ULL, /* double 2.0 */
46 0x4008000000000000ULL, /* double 3.0 */
47 0x4010000000000000ULL, /* double 4.0 */
48 0x4014000000000000ULL, /* double 5.0 */
49 0x3fe0000000000000ULL, /* double 0.5 */
50 0x4024000000000000ULL /* double 10.0 */
51 };
52
53 const float32 float32Constant[] = {
54 0x00000000, /* single 0.0 */
55 0x3f800000, /* single 1.0 */
56 0x40000000, /* single 2.0 */
57 0x40400000, /* single 3.0 */
58 0x40800000, /* single 4.0 */
59 0x40a00000, /* single 5.0 */
60 0x3f000000, /* single 0.5 */
61 0x41200000 /* single 10.0 */
62 };
63
64 /* condition code lookup table
65 index into the table is test code: EQ, NE, ... LT, GT, AL, NV
66 bit position in short is condition code: NZCV */
67 static const unsigned short aCC[16] = {
68 0xF0F0, // EQ == Z set
69 0x0F0F, // NE
70 0xCCCC, // CS == C set
71 0x3333, // CC
72 0xFF00, // MI == N set
73 0x00FF, // PL
74 0xAAAA, // VS == V set
75 0x5555, // VC
76 0x0C0C, // HI == C set && Z clear
77 0xF3F3, // LS == C clear || Z set
78 0xAA55, // GE == (N==V)
79 0x55AA, // LT == (N!=V)
80 0x0A05, // GT == (!Z && (N==V))
81 0xF5FA, // LE == (Z || (N!=V))
82 0xFFFF, // AL always
83 0 // NV
84 };
85
checkCondition(const unsigned int opcode,const unsigned int ccodes)86 unsigned int checkCondition(const unsigned int opcode, const unsigned int ccodes)
87 {
88 return (aCC[opcode >> 28] >> (ccodes >> 28)) & 1;
89 }
90