arch/arm/nwfpe/extended_cpdo.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3     NetWinder Floating Point Emulator
   4     (c) Rebel.COM, 1998,1999
   5
   6     Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
   7
   8 */
   9
  10 #include "fpa11.h"
  11 #include "softfloat.h"
  12 #include "fpopcode.h"
  13
  14 floatx80 floatx80_exp(floatx80 Fm);
  15 floatx80 floatx80_ln(floatx80 Fm);
  16 floatx80 floatx80_sin(floatx80 rFm);
  17 floatx80 floatx80_cos(floatx80 rFm);
  18 floatx80 floatx80_arcsin(floatx80 rFm);
  19 floatx80 floatx80_arctan(floatx80 rFm);
  20 floatx80 floatx80_log(floatx80 rFm);
  21 floatx80 floatx80_tan(floatx80 rFm);
  22 floatx80 floatx80_arccos(floatx80 rFm);
  23 floatx80 floatx80_pow(floatx80 rFn, floatx80 rFm);
  24 floatx80 floatx80_pol(floatx80 rFn, floatx80 rFm);
  25
  26 static floatx80 floatx80_rsf(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
  27 {
  28         return floatx80_sub(roundData, rFm, rFn);
  29 }
  30
  31 static floatx80 floatx80_rdv(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
  32 {
  33         return floatx80_div(roundData, rFm, rFn);
  34 }
  35
  36 static floatx80 (*const dyadic_extended[16])(struct roundingData*, floatx80 rFn, floatx80 rFm) = {
  37         [ADF_CODE >> 20] = floatx80_add,
  38         [MUF_CODE >> 20] = floatx80_mul,
  39         [SUF_CODE >> 20] = floatx80_sub,
  40         [RSF_CODE >> 20] = floatx80_rsf,
  41         [DVF_CODE >> 20] = floatx80_div,
  42         [RDF_CODE >> 20] = floatx80_rdv,
  43         [RMF_CODE >> 20] = floatx80_rem,
  44
  45         /* strictly, these opcodes should not be implemented */
  46         [FML_CODE >> 20] = floatx80_mul,
  47         [FDV_CODE >> 20] = floatx80_div,
  48         [FRD_CODE >> 20] = floatx80_rdv,
  49 };
  50
  51 static floatx80 floatx80_mvf(struct roundingData *roundData, floatx80 rFm)
  52 {
  53         return rFm;
  54 }
  55
  56 static floatx80 floatx80_mnf(struct roundingData *roundData, floatx80 rFm)
  57 {
  58         rFm.high ^= 0x8000;
  59         return rFm;
  60 }
  61
  62 static floatx80 floatx80_abs(struct roundingData *roundData, floatx80 rFm)
  63 {
  64         rFm.high &= 0x7fff;
  65         return rFm;
  66 }
  67
  68 static floatx80 (*const monadic_extended[16])(struct roundingData*, floatx80 rFm) = {
  69         [MVF_CODE >> 20] = floatx80_mvf,
  70         [MNF_CODE >> 20] = floatx80_mnf,
  71         [ABS_CODE >> 20] = floatx80_abs,
  72         [RND_CODE >> 20] = floatx80_round_to_int,
  73         [URD_CODE >> 20] = floatx80_round_to_int,
  74         [SQT_CODE >> 20] = floatx80_sqrt,
  75         [NRM_CODE >> 20] = floatx80_mvf,
  76 };
  77
  78 unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
  79 {
  80         FPA11 *fpa11 = GET_FPA11();
  81         floatx80 rFm;
  82         unsigned int Fm, opc_mask_shift;
  83
  84         Fm = getFm(opcode);
  85         if (CONSTANT_FM(opcode)) {
  86                 rFm = getExtendedConstant(Fm);
  87         } else {
  88                 switch (fpa11->fType[Fm]) {
  89                 case typeSingle:
  90                         rFm = float32_to_floatx80(fpa11->fpreg[Fm].fSingle);
  91                         break;
  92
  93                 case typeDouble:
  94                         rFm = float64_to_floatx80(fpa11->fpreg[Fm].fDouble);
  95                         break;
  96
  97                 case typeExtended:
  98                         rFm = fpa11->fpreg[Fm].fExtended;
  99                         break;
 100
 101                 default:
 102                         return 0;
 103                 }
 104         }
 105
 106         opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
 107         if (!MONADIC_INSTRUCTION(opcode)) {
 108                 unsigned int Fn = getFn(opcode);
 109                 floatx80 rFn;
 110
 111                 switch (fpa11->fType[Fn]) {
 112                 case typeSingle:
 113                         rFn = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
 114                         break;
 115
 116                 case typeDouble:
 117                         rFn = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
 118                         break;
 119
 120                 case typeExtended:
 121                         rFn = fpa11->fpreg[Fn].fExtended;
 122                         break;
 123
 124                 default:
 125                         return 0;
 126                 }
 127
 128                 if (dyadic_extended[opc_mask_shift]) {
 129                         rFd->fExtended = dyadic_extended[opc_mask_shift](roundData, rFn, rFm);
 130                 } else {
 131                         return 0;
 132                 }
 133         } else {
 134                 if (monadic_extended[opc_mask_shift]) {
 135                         rFd->fExtended = monadic_extended[opc_mask_shift](roundData, rFm);
 136                 } else {
 137                         return 0;
 138                 }
 139         }
 140
 141         return 1;
 142 }