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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 0213 9 , USA .
*/
# include "fpa11.h"
# include "softfloat.h"
# include "fpopcode.h"
# include "fpsr.h"
// # include "fpmodule.h"
// # include "fpmodule.inl"
const floatx80 floatx80Constant [] = {
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{ 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 */
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};
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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 */
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};
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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 */
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};
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unsigned int getTransferLength ( const unsigned int opcode )
{
unsigned int nRc ;
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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 ;
}
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return ( nRc );
}
unsigned int getRegisterCount ( const unsigned int opcode )
{
unsigned int nRc ;
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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 ;
}
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return ( nRc );
}
unsigned int getRoundingPrecision ( const unsigned int opcode )
{
unsigned int nRc ;
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switch ( opcode & MASK_ROUNDING_PRECISION )
{
case 0x00000000 : nRc = 1 ; break ;
case 0x00000080 : nRc = 2 ; break ;
case 0x00080000 : nRc = 3 ; break ;
default : nRc = 0 ;
}
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return ( nRc );
}
unsigned int getDestinationSize ( const unsigned int opcode )
{
unsigned int nRc ;
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switch ( opcode & MASK_DESTINATION_SIZE )
{
case 0x00000000 : nRc = typeSingle ; break ;
case 0x00000080 : nRc = typeDouble ; break ;
case 0x00080000 : nRc = typeExtended ; break ;
default : nRc = typeNone ;
}
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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
};
unsigned int checkCondition ( const unsigned int opcode , const unsigned int ccodes )
{
return ( aCC [ opcode >> 28 ] >> ( ccodes >> 28 )) & 1 ;
}