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, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include "softfloat.h"
26 floatx80 floatx80_exp(floatx80 Fm);
27 floatx80 floatx80_ln(floatx80 Fm);
28 floatx80 floatx80_sin(floatx80 rFm);
29 floatx80 floatx80_cos(floatx80 rFm);
30 floatx80 floatx80_arcsin(floatx80 rFm);
31 floatx80 floatx80_arctan(floatx80 rFm);
32 floatx80 floatx80_log(floatx80 rFm);
33 floatx80 floatx80_tan(floatx80 rFm);
34 floatx80 floatx80_arccos(floatx80 rFm);
35 floatx80 floatx80_pow(floatx80 rFn, floatx80 rFm);
36 floatx80 floatx80_pol(floatx80 rFn, floatx80 rFm);
38 static floatx80 floatx80_rsf(floatx80 rFn, floatx80 rFm)
40 return floatx80_sub(rFm, rFn);
43 static floatx80 floatx80_rdv(floatx80 rFn, floatx80 rFm)
45 return floatx80_div(rFm, rFn);
48 static floatx80 (*const dyadic_extended[16])(floatx80 rFn, floatx80 rFm) = {
49 [ADF_CODE >> 20] = floatx80_add,
50 [MUF_CODE >> 20] = floatx80_mul,
51 [SUF_CODE >> 20] = floatx80_sub,
52 [RSF_CODE >> 20] = floatx80_rsf,
53 [DVF_CODE >> 20] = floatx80_div,
54 [RDF_CODE >> 20] = floatx80_rdv,
55 [RMF_CODE >> 20] = floatx80_rem,
57 /* strictly, these opcodes should not be implemented */
58 [FML_CODE >> 20] = floatx80_mul,
59 [FDV_CODE >> 20] = floatx80_div,
60 [FRD_CODE >> 20] = floatx80_rdv,
63 static floatx80 floatx80_mvf(floatx80 rFm)
68 static floatx80 floatx80_mnf(floatx80 rFm)
74 static floatx80 floatx80_abs(floatx80 rFm)
80 static floatx80 (*const monadic_extended[16])(floatx80 rFm) = {
81 [MVF_CODE >> 20] = floatx80_mvf,
82 [MNF_CODE >> 20] = floatx80_mnf,
83 [ABS_CODE >> 20] = floatx80_abs,
84 [RND_CODE >> 20] = floatx80_round_to_int,
85 [URD_CODE >> 20] = floatx80_round_to_int,
86 [SQT_CODE >> 20] = floatx80_sqrt,
87 [NRM_CODE >> 20] = floatx80_mvf,
90 unsigned int ExtendedCPDO(const unsigned int opcode, FPREG * rFd)
92 FPA11 *fpa11 = GET_FPA11();
94 unsigned int Fm, opc_mask_shift;
97 if (CONSTANT_FM(opcode)) {
98 rFm = getExtendedConstant(Fm);
100 switch (fpa11->fType[Fm]) {
102 rFm = float32_to_floatx80(fpa11->fpreg[Fm].fSingle);
106 rFm = float64_to_floatx80(fpa11->fpreg[Fm].fDouble);
110 rFm = fpa11->fpreg[Fm].fExtended;
118 opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
119 if (!MONADIC_INSTRUCTION(opcode)) {
120 unsigned int Fn = getFn(opcode);
123 switch (fpa11->fType[Fn]) {
125 rFn = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
129 rFn = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
133 rFn = fpa11->fpreg[Fn].fExtended;
140 if (dyadic_extended[opc_mask_shift]) {
141 rFd->fExtended = dyadic_extended[opc_mask_shift](rFn, rFm);
146 if (monadic_extended[opc_mask_shift]) {
147 rFd->fExtended = monadic_extended[opc_mask_shift](rFm);