arch/arm/nwfpe/single_cpdo.c

   1 /*
   2     NetWinder Floating Point Emulator
   3     (c) Rebel.COM, 1998,1999
   4     (c) Philip Blundell, 2001
   5
   6     Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "fpa11.h"
  24 #include "softfloat.h"
  25 #include "fpopcode.h"
  26
  27 float32 float32_exp(float32 Fm);
  28 float32 float32_ln(float32 Fm);
  29 float32 float32_sin(float32 rFm);
  30 float32 float32_cos(float32 rFm);
  31 float32 float32_arcsin(float32 rFm);
  32 float32 float32_arctan(float32 rFm);
  33 float32 float32_log(float32 rFm);
  34 float32 float32_tan(float32 rFm);
  35 float32 float32_arccos(float32 rFm);
  36 float32 float32_pow(float32 rFn, float32 rFm);
  37 float32 float32_pol(float32 rFn, float32 rFm);
  38
  39 static float32 float32_rsf(float32 rFn, float32 rFm)
  40 {
  41         return float32_sub(rFm, rFn);
  42 }
  43
  44 static float32 float32_rdv(float32 rFn, float32 rFm)
  45 {
  46         return float32_div(rFm, rFn);
  47 }
  48
  49 static float32 (*const dyadic_single[16])(float32 rFn, float32 rFm) = {
  50         [ADF_CODE >> 20] = float32_add,
  51         [MUF_CODE >> 20] = float32_mul,
  52         [SUF_CODE >> 20] = float32_sub,
  53         [RSF_CODE >> 20] = float32_rsf,
  54         [DVF_CODE >> 20] = float32_div,
  55         [RDF_CODE >> 20] = float32_rdv,
  56         [RMF_CODE >> 20] = float32_rem,
  57
  58         [FML_CODE >> 20] = float32_mul,
  59         [FDV_CODE >> 20] = float32_div,
  60         [FRD_CODE >> 20] = float32_rdv,
  61 };
  62
  63 static float32 float32_mvf(float32 rFm)
  64 {
  65         return rFm;
  66 }
  67
  68 static float32 float32_mnf(float32 rFm)
  69 {
  70         return rFm ^ 0x80000000;
  71 }
  72
  73 static float32 float32_abs(float32 rFm)
  74 {
  75         return rFm & 0x7fffffff;
  76 }
  77
  78 static float32 (*const monadic_single[16])(float32 rFm) = {
  79         [MVF_CODE >> 20] = float32_mvf,
  80         [MNF_CODE >> 20] = float32_mnf,
  81         [ABS_CODE >> 20] = float32_abs,
  82         [RND_CODE >> 20] = float32_round_to_int,
  83         [URD_CODE >> 20] = float32_round_to_int,
  84         [SQT_CODE >> 20] = float32_sqrt,
  85         [NRM_CODE >> 20] = float32_mvf,
  86 };
  87
  88 unsigned int SingleCPDO(const unsigned int opcode, FPREG * rFd)
  89 {
  90         FPA11 *fpa11 = GET_FPA11();
  91         float32 rFm;
  92         unsigned int Fm, opc_mask_shift;
  93
  94         Fm = getFm(opcode);
  95         if (CONSTANT_FM(opcode)) {
  96                 rFm = getSingleConstant(Fm);
  97         } else if (fpa11->fType[Fm] == typeSingle) {
  98                 rFm = fpa11->fpreg[Fm].fSingle;
  99         } else {
 100                 return 0;
 101         }
 102
 103         opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
 104         if (!MONADIC_INSTRUCTION(opcode)) {
 105                 unsigned int Fn = getFn(opcode);
 106                 float32 rFn;
 107
 108                 if (fpa11->fType[Fn] == typeSingle &&
 109                     dyadic_single[opc_mask_shift]) {
 110                         rFn = fpa11->fpreg[Fn].fSingle;
 111                         rFd->fSingle = dyadic_single[opc_mask_shift](rFn, rFm);
 112                 } else {
 113                         return 0;
 114                 }
 115         } else {
 116                 if (monadic_single[opc_mask_shift]) {
 117                         rFd->fSingle = monadic_single[opc_mask_shift](rFm);
 118                 } else {
 119                         return 0;
 120                 }
 121         }
 122
 123         return 1;
 124 }