113 lines
3.5 KiB
C
113 lines
3.5 KiB
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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "fpa11.h"
|
|
#include "fpu/softfloat.h"
|
|
#include "fpopcode.h"
|
|
#include "fpsr.h"
|
|
//#include "fpmodule.h"
|
|
//#include "fpmodule.inl"
|
|
|
|
const floatx80 floatx80Constant[] = {
|
|
{ 0x0000000000000000ULL, 0x0000}, /* extended 0.0 */
|
|
{ 0x8000000000000000ULL, 0x3fff}, /* extended 1.0 */
|
|
{ 0x8000000000000000ULL, 0x4000}, /* extended 2.0 */
|
|
{ 0xc000000000000000ULL, 0x4000}, /* extended 3.0 */
|
|
{ 0x8000000000000000ULL, 0x4001}, /* extended 4.0 */
|
|
{ 0xa000000000000000ULL, 0x4001}, /* extended 5.0 */
|
|
{ 0x8000000000000000ULL, 0x3ffe}, /* extended 0.5 */
|
|
{ 0xa000000000000000ULL, 0x4002} /* extended 10.0 */
|
|
};
|
|
|
|
const float64 float64Constant[] = {
|
|
const_float64(0x0000000000000000ULL), /* double 0.0 */
|
|
const_float64(0x3ff0000000000000ULL), /* double 1.0 */
|
|
const_float64(0x4000000000000000ULL), /* double 2.0 */
|
|
const_float64(0x4008000000000000ULL), /* double 3.0 */
|
|
const_float64(0x4010000000000000ULL), /* double 4.0 */
|
|
const_float64(0x4014000000000000ULL), /* double 5.0 */
|
|
const_float64(0x3fe0000000000000ULL), /* double 0.5 */
|
|
const_float64(0x4024000000000000ULL) /* double 10.0 */
|
|
};
|
|
|
|
const float32 float32Constant[] = {
|
|
const_float32(0x00000000), /* single 0.0 */
|
|
const_float32(0x3f800000), /* single 1.0 */
|
|
const_float32(0x40000000), /* single 2.0 */
|
|
const_float32(0x40400000), /* single 3.0 */
|
|
const_float32(0x40800000), /* single 4.0 */
|
|
const_float32(0x40a00000), /* single 5.0 */
|
|
const_float32(0x3f000000), /* single 0.5 */
|
|
const_float32(0x41200000) /* single 10.0 */
|
|
};
|
|
|
|
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 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);
|
|
}
|
|
|
|
/* 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
|
|
};
|