2 NetWinder Floating Point Emulator
3 (c) Rebel.COM, 1998,1999
5 Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
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.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, see <http://www.gnu.org/licenses/>.
22 #include "softfloat.h"
25 //#include "fpmodule.h"
26 //#include "fpmodule.inl"
28 const floatx80 floatx80Constant
[] = {
29 { 0x0000000000000000ULL
, 0x0000}, /* extended 0.0 */
30 { 0x8000000000000000ULL
, 0x3fff}, /* extended 1.0 */
31 { 0x8000000000000000ULL
, 0x4000}, /* extended 2.0 */
32 { 0xc000000000000000ULL
, 0x4000}, /* extended 3.0 */
33 { 0x8000000000000000ULL
, 0x4001}, /* extended 4.0 */
34 { 0xa000000000000000ULL
, 0x4001}, /* extended 5.0 */
35 { 0x8000000000000000ULL
, 0x3ffe}, /* extended 0.5 */
36 { 0xa000000000000000ULL
, 0x4002} /* extended 10.0 */
39 const float64 float64Constant
[] = {
40 const_float64(0x0000000000000000ULL
), /* double 0.0 */
41 const_float64(0x3ff0000000000000ULL
), /* double 1.0 */
42 const_float64(0x4000000000000000ULL
), /* double 2.0 */
43 const_float64(0x4008000000000000ULL
), /* double 3.0 */
44 const_float64(0x4010000000000000ULL
), /* double 4.0 */
45 const_float64(0x4014000000000000ULL
), /* double 5.0 */
46 const_float64(0x3fe0000000000000ULL
), /* double 0.5 */
47 const_float64(0x4024000000000000ULL
) /* double 10.0 */
50 const float32 float32Constant
[] = {
51 const_float32(0x00000000), /* single 0.0 */
52 const_float32(0x3f800000), /* single 1.0 */
53 const_float32(0x40000000), /* single 2.0 */
54 const_float32(0x40400000), /* single 3.0 */
55 const_float32(0x40800000), /* single 4.0 */
56 const_float32(0x40a00000), /* single 5.0 */
57 const_float32(0x3f000000), /* single 0.5 */
58 const_float32(0x41200000) /* single 10.0 */
61 unsigned int getRegisterCount(const unsigned int opcode
)
65 switch (opcode
& MASK_REGISTER_COUNT
)
67 case 0x00000000: nRc
= 4; break;
68 case 0x00008000: nRc
= 1; break;
69 case 0x00400000: nRc
= 2; break;
70 case 0x00408000: nRc
= 3; break;
77 unsigned int getDestinationSize(const unsigned int opcode
)
81 switch (opcode
& MASK_DESTINATION_SIZE
)
83 case 0x00000000: nRc
= typeSingle
; break;
84 case 0x00000080: nRc
= typeDouble
; break;
85 case 0x00080000: nRc
= typeExtended
; break;
86 default: nRc
= typeNone
;
92 /* condition code lookup table
93 index into the table is test code: EQ, NE, ... LT, GT, AL, NV
94 bit position in short is condition code: NZCV */
95 static const unsigned short aCC
[16] = {
96 0xF0F0, // EQ == Z set
98 0xCCCC, // CS == C set
100 0xFF00, // MI == N set
102 0xAAAA, // VS == V set
104 0x0C0C, // HI == C set && Z clear
105 0xF3F3, // LS == C clear || Z set
106 0xAA55, // GE == (N==V)
107 0x55AA, // LT == (N!=V)
108 0x0A05, // GT == (!Z && (N==V))
109 0xF5FA, // LE == (Z || (N!=V))