arch/arm/nwfpe/single_cpdo.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3     NetWinder Floating Point Emulator
   4     (c) Rebel.COM, 1998,1999
   5     (c) Philip Blundell, 2001
   6
   7     Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
   8
   9 */
  10
  11 #include "fpa11.h"
  12 #include "softfloat.h"
  13 #include "fpopcode.h"
  14
  15 float32 float32_exp(float32 Fm);
  16 float32 float32_ln(float32 Fm);
  17 float32 float32_sin(float32 rFm);
  18 float32 float32_cos(float32 rFm);
  19 float32 float32_arcsin(float32 rFm);
  20 float32 float32_arctan(float32 rFm);
  21 float32 float32_log(float32 rFm);
  22 float32 float32_tan(float32 rFm);
  23 float32 float32_arccos(float32 rFm);
  24 float32 float32_pow(float32 rFn, float32 rFm);
  25 float32 float32_pol(float32 rFn, float32 rFm);
  26
  27 static float32 float32_rsf(struct roundingData *roundData, float32 rFn, float32 rFm)
  28 {
  29         return float32_sub(roundData, rFm, rFn);
  30 }
  31
  32 static float32 float32_rdv(struct roundingData *roundData, float32 rFn, float32 rFm)
  33 {
  34         return float32_div(roundData, rFm, rFn);
  35 }
  36
  37 static float32 (*const dyadic_single[16])(struct roundingData *, float32 rFn, float32 rFm) = {
  38         [ADF_CODE >> 20] = float32_add,
  39         [MUF_CODE >> 20] = float32_mul,
  40         [SUF_CODE >> 20] = float32_sub,
  41         [RSF_CODE >> 20] = float32_rsf,
  42         [DVF_CODE >> 20] = float32_div,
  43         [RDF_CODE >> 20] = float32_rdv,
  44         [RMF_CODE >> 20] = float32_rem,
  45
  46         [FML_CODE >> 20] = float32_mul,
  47         [FDV_CODE >> 20] = float32_div,
  48         [FRD_CODE >> 20] = float32_rdv,
  49 };
  50
  51 static float32 float32_mvf(struct roundingData *roundData, float32 rFm)
  52 {
  53         return rFm;
  54 }
  55
  56 static float32 float32_mnf(struct roundingData *roundData, float32 rFm)
  57 {
  58         return rFm ^ 0x80000000;
  59 }
  60
  61 static float32 float32_abs(struct roundingData *roundData, float32 rFm)
  62 {
  63         return rFm & 0x7fffffff;
  64 }
  65
  66 static float32 (*const monadic_single[16])(struct roundingData*, float32 rFm) = {
  67         [MVF_CODE >> 20] = float32_mvf,
  68         [MNF_CODE >> 20] = float32_mnf,
  69         [ABS_CODE >> 20] = float32_abs,
  70         [RND_CODE >> 20] = float32_round_to_int,
  71         [URD_CODE >> 20] = float32_round_to_int,
  72         [SQT_CODE >> 20] = float32_sqrt,
  73         [NRM_CODE >> 20] = float32_mvf,
  74 };
  75
  76 unsigned int SingleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
  77 {
  78         FPA11 *fpa11 = GET_FPA11();
  79         float32 rFm;
  80         unsigned int Fm, opc_mask_shift;
  81
  82         Fm = getFm(opcode);
  83         if (CONSTANT_FM(opcode)) {
  84                 rFm = getSingleConstant(Fm);
  85         } else if (fpa11->fType[Fm] == typeSingle) {
  86                 rFm = fpa11->fpreg[Fm].fSingle;
  87         } else {
  88                 return 0;
  89         }
  90
  91         opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
  92         if (!MONADIC_INSTRUCTION(opcode)) {
  93                 unsigned int Fn = getFn(opcode);
  94                 float32 rFn;
  95
  96                 if (fpa11->fType[Fn] == typeSingle &&
  97                     dyadic_single[opc_mask_shift]) {
  98                         rFn = fpa11->fpreg[Fn].fSingle;
  99                         rFd->fSingle = dyadic_single[opc_mask_shift](roundData, rFn, rFm);
 100                 } else {
 101                         return 0;
 102                 }
 103         } else {
 104                 if (monadic_single[opc_mask_shift]) {
 105                         rFd->fSingle = monadic_single[opc_mask_shift](roundData, rFm);
 106                 } else {
 107                         return 0;
 108                 }
 109         }
 110
 111         return 1;
 112 }