LXR linux/arch/arm/nwfpe/double

   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
  14union float64_components {
  15        float64 f64;
  16        unsigned int i[2];
  17};
  18
  19float64 float64_exp(float64 Fm);
  20float64 float64_ln(float64 Fm);
  21float64 float64_sin(float64 rFm);
  22float64 float64_cos(float64 rFm);
  23float64 float64_arcsin(float64 rFm);
  24float64 float64_arctan(float64 rFm);
  25float64 float64_log(float64 rFm);
  26float64 float64_tan(float64 rFm);
  27float64 float64_arccos(float64 rFm);
  28float64 float64_pow(float64 rFn, float64 rFm);
  29float64 float64_pol(float64 rFn, float64 rFm);
  30
  31static float64 float64_rsf(struct roundingData *roundData, float64 rFn, float64 rFm)
  32{
  33        return float64_sub(roundData, rFm, rFn);
  34}
  35
  36static float64 float64_rdv(struct roundingData *roundData, float64 rFn, float64 rFm)
  37{
  38        return float64_div(roundData, rFm, rFn);
  39}
  40
  41static 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
  56static float64 float64_mvf(struct roundingData *roundData,float64 rFm)
  57{
  58        return rFm;
  59}
  60
  61static 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
  75static 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
  89static 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
  99unsigned 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}
 156