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fpopcode.c

/*
    NetWinder Floating Point Emulator
    (c) Rebel.COM, 1998,1999

    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "fpa11.h"
#include "softfloat.h"
#include "fpopcode.h"
#include "fpsr.h"
#include "fpmodule.h"
#include "fpmodule.inl"

#ifdef CONFIG_FPE_NWFPE_XP
const floatx80 floatx80Constant[] = {
      { .high = 0x0000, .low = 0x0000000000000000ULL},/* extended 0.0 */
      { .high = 0x3fff, .low = 0x8000000000000000ULL},/* extended 1.0 */
      { .high = 0x4000, .low = 0x8000000000000000ULL},/* extended 2.0 */
      { .high = 0x4000, .low = 0xc000000000000000ULL},/* extended 3.0 */
      { .high = 0x4001, .low = 0x8000000000000000ULL},/* extended 4.0 */
      { .high = 0x4001, .low = 0xa000000000000000ULL},/* extended 5.0 */
      { .high = 0x3ffe, .low = 0x8000000000000000ULL},/* extended 0.5 */
      { .high = 0x4002, .low = 0xa000000000000000ULL},/* extended 10.0 */
};
#endif

const float64 float64Constant[] = {
      0x0000000000000000ULL,  /* double 0.0 */
      0x3ff0000000000000ULL,  /* double 1.0 */
      0x4000000000000000ULL,  /* double 2.0 */
      0x4008000000000000ULL,  /* double 3.0 */
      0x4010000000000000ULL,  /* double 4.0 */
      0x4014000000000000ULL,  /* double 5.0 */
      0x3fe0000000000000ULL,  /* double 0.5 */
      0x4024000000000000ULL   /* double 10.0 */
};

const float32 float32Constant[] = {
      0x00000000,       /* single 0.0 */
      0x3f800000,       /* single 1.0 */
      0x40000000,       /* single 2.0 */
      0x40400000,       /* single 3.0 */
      0x40800000,       /* single 4.0 */
      0x40a00000,       /* single 5.0 */
      0x3f000000,       /* single 0.5 */
      0x41200000        /* single 10.0 */
};

/* condition code lookup table
 index into the table is test code: EQ, NE, ... LT, GT, AL, NV
 bit position in short is condition code: NZCV */
static const unsigned short aCC[16] = {
      0xF0F0,                 // EQ == Z set
      0x0F0F,                 // NE
      0xCCCC,                 // CS == C set
      0x3333,                 // CC
      0xFF00,                 // MI == N set
      0x00FF,                 // PL
      0xAAAA,                 // VS == V set
      0x5555,                 // VC
      0x0C0C,                 // HI == C set && Z clear
      0xF3F3,                 // LS == C clear || Z set
      0xAA55,                 // GE == (N==V)
      0x55AA,                 // LT == (N!=V)
      0x0A05,                 // GT == (!Z && (N==V))
      0xF5FA,                 // LE == (Z || (N!=V))
      0xFFFF,                 // AL always
      0                 // NV
};

unsigned int checkCondition(const unsigned int opcode, const unsigned int ccodes)
{
      return (aCC[opcode >> 28] >> (ccodes >> 28)) & 1;
}

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