root/arch/arm/nwfpe/double_cpdo.c

DEFINITIONS

1. float64_rsf
2. float64_rdv
3. float64_mvf
4. float64_mnf
5. float64_abs
6. DoubleCPDO

   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 union float64_components {
  15         float64 f64;
  16         unsigned int i[2];
  17 };
  18 
  19 float64 float64_exp(float64 Fm);
  20 float64 float64_ln(float64 Fm);
  21 float64 float64_sin(float64 rFm);
  22 float64 float64_cos(float64 rFm);
  23 float64 float64_arcsin(float64 rFm);
  24 float64 float64_arctan(float64 rFm);
  25 float64 float64_log(float64 rFm);
  26 float64 float64_tan(float64 rFm);
  27 float64 float64_arccos(float64 rFm);
  28 float64 float64_pow(float64 rFn, float64 rFm);
  29 float64 float64_pol(float64 rFn, float64 rFm);
  30 
  31 static float64 float64_rsf(struct roundingData *roundData, float64 rFn, float64 rFm)
  32 {
  33         return float64_sub(roundData, rFm, rFn);
  34 }
  35 
  36 static float64 float64_rdv(struct roundingData *roundData, float64 rFn, float64 rFm)
  37 {
  38         return float64_div(roundData, rFm, rFn);
  39 }
  40 
  41 static float64 (*const dyadic_double[16])(struct roundingData*, float64 rFn, float64 rFm) = {
  42         [ADF_CODE >> 20] = float64_add,
  43         [MUF_CODE >> 20] = float64_mul,
  44         [SUF_CODE >> 20] = float64_sub,
  45         [RSF_CODE >> 20] = float64_rsf,
  46         [DVF_CODE >> 20] = float64_div,
  47         [RDF_CODE >> 20] = float64_rdv,
  48         [RMF_CODE >> 20] = float64_rem,
  49 
  50         /* strictly, these opcodes should not be implemented */
  51         [FML_CODE >> 20] = float64_mul,
  52         [FDV_CODE >> 20] = float64_div,
  53         [FRD_CODE >> 20] = float64_rdv,
  54 };
  55 
  56 static float64 float64_mvf(struct roundingData *roundData,float64 rFm)
  57 {
  58         return rFm;
  59 }
  60 
  61 static float64 float64_mnf(struct roundingData *roundData,float64 rFm)
  62 {
  63         union float64_components u;
  64 
  65         u.f64 = rFm;
  66 #ifdef __ARMEB__
  67         u.i[0] ^= 0x80000000;
  68 #else
  69         u.i[1] ^= 0x80000000;
  70 #endif
  71 
  72         return u.f64;
  73 }
  74 
  75 static float64 float64_abs(struct roundingData *roundData,float64 rFm)
  76 {
  77         union float64_components u;
  78 
  79         u.f64 = rFm;
  80 #ifdef __ARMEB__
  81         u.i[0] &= 0x7fffffff;
  82 #else
  83         u.i[1] &= 0x7fffffff;
  84 #endif
  85 
  86         return u.f64;
  87 }
  88 
  89 static float64 (*const monadic_double[16])(struct roundingData *, float64 rFm) = {
  90         [MVF_CODE >> 20] = float64_mvf,
  91         [MNF_CODE >> 20] = float64_mnf,
  92         [ABS_CODE >> 20] = float64_abs,
  93         [RND_CODE >> 20] = float64_round_to_int,
  94         [URD_CODE >> 20] = float64_round_to_int,
  95         [SQT_CODE >> 20] = float64_sqrt,
  96         [NRM_CODE >> 20] = float64_mvf,
  97 };
  98 
  99 unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
 100 {
 101         FPA11 *fpa11 = GET_FPA11();
 102         float64 rFm;
 103         unsigned int Fm, opc_mask_shift;
 104 
 105         Fm = getFm(opcode);
 106         if (CONSTANT_FM(opcode)) {
 107                 rFm = getDoubleConstant(Fm);
 108         } else {
 109                 switch (fpa11->fType[Fm]) {
 110                 case typeSingle:
 111                         rFm = float32_to_float64(fpa11->fpreg[Fm].fSingle);
 112                         break;
 113 
 114                 case typeDouble:
 115                         rFm = fpa11->fpreg[Fm].fDouble;
 116                         break;
 117 
 118                 default:
 119                         return 0;
 120                 }
 121         }
 122 
 123         opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
 124         if (!MONADIC_INSTRUCTION(opcode)) {
 125                 unsigned int Fn = getFn(opcode);
 126                 float64 rFn;
 127 
 128                 switch (fpa11->fType[Fn]) {
 129                 case typeSingle:
 130                         rFn = float32_to_float64(fpa11->fpreg[Fn].fSingle);
 131                         break;
 132 
 133                 case typeDouble:
 134                         rFn = fpa11->fpreg[Fn].fDouble;
 135                         break;
 136 
 137                 default:
 138                         return 0;
 139                 }
 140 
 141                 if (dyadic_double[opc_mask_shift]) {
 142                         rFd->fDouble = dyadic_double[opc_mask_shift](roundData, rFn, rFm);
 143                 } else {
 144                         return 0;
 145                 }
 146         } else {
 147                 if (monadic_double[opc_mask_shift]) {
 148                         rFd->fDouble = monadic_double[opc_mask_shift](roundData, rFm);
 149                 } else {
 150                         return 0;
 151                 }
 152         }
 153 
 154         return 1;
 155 }