arch/arm/nwfpe/fpopcode.c

   1 /*
   2     NetWinder Floating Point Emulator
   3     (c) Rebel.COM, 1998,1999
   4
   5     Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include <linux/config.h>
  23 #include "fpa11.h"
  24 #include "softfloat.h"
  25 #include "fpopcode.h"
  26 #include "fpsr.h"
  27 #include "fpmodule.h"
  28 #include "fpmodule.inl"
  29
  30 #ifdef CONFIG_FPE_NWFPE_XP
  31 const floatx80 floatx80Constant[] = {
  32         {0x0000, 0x0000000000000000ULL},        /* extended 0.0 */
  33         {0x3fff, 0x8000000000000000ULL},        /* extended 1.0 */
  34         {0x4000, 0x8000000000000000ULL},        /* extended 2.0 */
  35         {0x4000, 0xc000000000000000ULL},        /* extended 3.0 */
  36         {0x4001, 0x8000000000000000ULL},        /* extended 4.0 */
  37         {0x4001, 0xa000000000000000ULL},        /* extended 5.0 */
  38         {0x3ffe, 0x8000000000000000ULL},        /* extended 0.5 */
  39         {0x4002, 0xa000000000000000ULL}         /* extended 10.0 */
  40 };
  41 #endif
  42
  43 const float64 float64Constant[] = {
  44         0x0000000000000000ULL,  /* double 0.0 */
  45         0x3ff0000000000000ULL,  /* double 1.0 */
  46         0x4000000000000000ULL,  /* double 2.0 */
  47         0x4008000000000000ULL,  /* double 3.0 */
  48         0x4010000000000000ULL,  /* double 4.0 */
  49         0x4014000000000000ULL,  /* double 5.0 */
  50         0x3fe0000000000000ULL,  /* double 0.5 */
  51         0x4024000000000000ULL   /* double 10.0 */
  52 };
  53
  54 const float32 float32Constant[] = {
  55         0x00000000,             /* single 0.0 */
  56         0x3f800000,             /* single 1.0 */
  57         0x40000000,             /* single 2.0 */
  58         0x40400000,             /* single 3.0 */
  59         0x40800000,             /* single 4.0 */
  60         0x40a00000,             /* single 5.0 */
  61         0x3f000000,             /* single 0.5 */
  62         0x41200000              /* single 10.0 */
  63 };
  64
  65 /* condition code lookup table
  66  index into the table is test code: EQ, NE, ... LT, GT, AL, NV
  67  bit position in short is condition code: NZCV */
  68 static const unsigned short aCC[16] = {
  69         0xF0F0,                 // EQ == Z set
  70         0x0F0F,                 // NE
  71         0xCCCC,                 // CS == C set
  72         0x3333,                 // CC
  73         0xFF00,                 // MI == N set
  74         0x00FF,                 // PL
  75         0xAAAA,                 // VS == V set
  76         0x5555,                 // VC
  77         0x0C0C,                 // HI == C set && Z clear
  78         0xF3F3,                 // LS == C clear || Z set
  79         0xAA55,                 // GE == (N==V)
  80         0x55AA,                 // LT == (N!=V)
  81         0x0A05,                 // GT == (!Z && (N==V))
  82         0xF5FA,                 // LE == (Z || (N!=V))
  83         0xFFFF,                 // AL always
  84         0                       // NV
  85 };
  86
  87 unsigned int checkCondition(const unsigned int opcode, const unsigned int ccodes)
  88 {
  89         return (aCC[opcode >> 28] >> (ccodes >> 28)) & 1;
  90 }