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/*
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 "config.h"
#include "softfloat.h"
#include "fpopcode.h"
#include "fpsr.h"
#include "fpa11.h"
#include "fpmodule.h"
#include "fpmodule.inl"
static floatx80 floatx80Constant[] = {
{ 0x0000, 0x0000000000000000ULL}, /* extended 0.0 */
{ 0x3fff, 0x8000000000000000ULL}, /* extended 1.0 */
{ 0x4000, 0x8000000000000000ULL}, /* extended 2.0 */
{ 0x4000, 0xc000000000000000ULL}, /* extended 3.0 */
{ 0x4001, 0x8000000000000000ULL}, /* extended 4.0 */
{ 0x4001, 0xa000000000000000ULL}, /* extended 5.0 */
{ 0x3ffe, 0x8000000000000000ULL}, /* extended 0.5 */
{ 0x4002, 0xa000000000000000ULL} /* extended 10.0 */
};
static 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 */
};
static 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 */
};
floatx80 getExtendedConstant(const unsigned int nIndex)
{
return floatx80Constant[nIndex];
}
float64 getDoubleConstant(const unsigned int nIndex)
{
return float64Constant[nIndex];
}
float32 getSingleConstant(const unsigned int nIndex)
{
return float32Constant[nIndex];
}
unsigned int getTransferLength(const unsigned int opcode)
{
unsigned int nRc;
switch (opcode & MASK_TRANSFER_LENGTH)
{
case 0x00000000: nRc = 1; break; /* single precision */
case 0x00008000: nRc = 2; break; /* double precision */
case 0x00400000: nRc = 3; break; /* extended precision */
default: nRc = 0;
}
return(nRc);
}
unsigned int getRegisterCount(const unsigned int opcode)
{
unsigned int nRc;
switch (opcode & MASK_REGISTER_COUNT)
{
case 0x00000000: nRc = 4; break;
case 0x00008000: nRc = 1; break;
case 0x00400000: nRc = 2; break;
case 0x00408000: nRc = 3; break;
default: nRc = 0;
}
return(nRc);
}
unsigned int getRoundingPrecision(const unsigned int opcode)
{
unsigned int nRc;
switch (opcode & MASK_ROUNDING_PRECISION)
{
case 0x00000000: nRc = 1; break;
case 0x00000080: nRc = 2; break;
case 0x00080000: nRc = 3; break;
default: nRc = 0;
}
return(nRc);
}
unsigned int getDestinationSize(const unsigned int opcode)
{
unsigned int nRc;
switch (opcode & MASK_DESTINATION_SIZE)
{
case 0x00000000: nRc = typeSingle; break;
case 0x00000080: nRc = typeDouble; break;
case 0x00080000: nRc = typeExtended; break;
default: nRc = typeNone;
}
return(nRc);
}
/* contition code lookup table
index into the table is test code: EQ, NE, ... LT, GT, AL, NV
bit position in short is condition code: NZCV */
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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