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#include "xc88x.h"
#include "mdu88x.h"
static uint16_t v;
static uint32_t d;
/* unsigned OPs */
uint8_t
mdu_32udiv16(uint32_t op1, uint16_t op2, uint32_t *res, uint16_t *rem)
__reentrant
{
MD0= op1 & 0xff;
MD1= (op1 >> 8) & 0xff;
MD2= (op1 >> 16) & 0xff;
MD3= (op1 >> 24) & 0xff;
MD4= op2 & 0xff;
MD5= (op2 >> 8) & 0xff;
MDUCON= 0x10 + 0x02;
while (MDUSTAT & 0x04) ;
d= (uint32_t)MD0 + (uint32_t)MD1*256l + (uint32_t)MD2*256l*256l + (uint32_t)MD3*256l*256l*256l;
if (res)
*res= d;
v= MD5*256 + MD4;
if (rem)
*rem= v;
return MDUSTAT & 0x02;
}
uint8_t
mdu_16udiv16(uint16_t op1, uint16_t op2, uint16_t *res, uint16_t *rem)
__reentrant
{
MD0= op1 & 0xff;
MD1= (op1 >> 8) & 0xff;
MD4= op2 & 0xff;
MD5= (op2 >> 8) & 0xff;
MDUCON= 0x10 + 0x01;
while (MDUSTAT & 0x04) ;
v= MD1*256 + MD0;
if (res)
*res= v;
v= MD5*256 + MD4;
if (rem)
*rem= v;
return MDUSTAT & 0x02;
}
uint8_t
mdu_16umul16(uint16_t op1, uint16_t op2, uint32_t *res)
__reentrant
{
MD0= op1 & 0xff;
MD4= op2 & 0xff;
MD1= (op1 >> 8) & 0xff;
MD5= (op2 >> 8) & 0xff;
MDUCON= 0x10 + 0x00;
while (MDUSTAT & 0x04) ;
d= (uint32_t)MD0 + (uint32_t)MD1*256l + (uint32_t)MD2*256l*256l + (uint32_t)MD3*256l*256l*256l;
if (res)
*res= d;
return MDUSTAT & 0x02;
}
/* signed OPs */
uint8_t
mdu_32sdiv16(int32_t op1, int16_t op2, int32_t *res, int16_t *rem)
__reentrant
{
MD0= op1 & 0xff;
MD1= (op1 >> 8) & 0xff;
MD2= (op1 >> 16) & 0xff;
MD3= (op1 >> 24) & 0xff;
MD4= op2 & 0xff;
MD5= (op2 >> 8) & 0xff;
MDUCON= 0x10 + 0x06;
while (MDUSTAT & 0x04) ;
d= (uint32_t)MD0 + (uint32_t)MD1*256l + (uint32_t)MD2*256l*256l + (uint32_t)MD3*256l*256l*256l;
if (res)
*res= d;
v= MD5*256 + MD4;
if (rem)
*rem= v;
return MDUSTAT & 0x02;
}
uint8_t
mdu_16sdiv16(int16_t op1, int16_t op2, int16_t *res, int16_t *rem)
__reentrant
{
MD0= op1 & 0xff;
MD1= (op1 >> 8) & 0xff;
MD4= op2 & 0xff;
MD5= (op2 >> 8) & 0xff;
MDUCON= 0x10 + 0x05;
while (MDUSTAT & 0x04) ;
v= MD1*256 + MD0;
if (res)
*res= v;
v= MD5*256 + MD4;
if (rem)
*rem= v;
return MDUSTAT & 0x02;
}
uint8_t
mdu_16smul16(int16_t op1, int16_t op2, int32_t *res)
__reentrant
{
MD0= op1 & 0xff;
MD4= op2 & 0xff;
MD1= (op1 >> 8) & 0xff;
MD5= (op2 >> 8) & 0xff;
MDUCON= 0x10 + 0x04;
while (MDUSTAT & 0x04) ;
d= (uint32_t)MD0 + (uint32_t)MD1*256l + (uint32_t)MD2*256l*256l + (uint32_t)MD3*256l*256l*256l;
if (res)
*res= d;
return MDUSTAT & 0x02;
}
/* normalize */
uint8_t
mdu_norm(uint32_t op, uint32_t *res, uint8_t *nuof_shifts)
__reentrant
{
MD0= op & 0xff;
MD1= (op >> 8) & 0xff;
MD2= (op >> 16) & 0xff;
MD3= (op >> 24) & 0xff;
MDUCON= 0x10 + 0x08;
while (MDUSTAT & 0x04) ;
d= (uint32_t)MD0 + (uint32_t)MD1*256l + (uint32_t)MD2*256l*256l + (uint32_t)MD3*256l*256l*256l;
if (res)
*res= d;
if (nuof_shifts)
*nuof_shifts= MD4 & 0x1f;
return MDUSTAT & 0x02;
}
/* logical shifts */
uint8_t
mdu_lshift(uint32_t op, uint8_t shifts, uint8_t right, uint32_t *res)
__reentrant
{
MD0= op & 0xff;
MD1= (op >> 8) & 0xff;
MD2= (op >> 16) & 0xff;
MD3= (op >> 24) & 0xff;
MD4= (right?0x20:0) + (shifts&0x1f);
MDUCON= 0x10 + 0x03;
while (MDUSTAT & 0x04) ;
d= (uint32_t)MD0 + (uint32_t)MD1*256l + (uint32_t)MD2*256l*256l + (uint32_t)MD3*256l*256l*256l;
if (res)
*res= d;
return MDUSTAT & 0x02;
}
uint8_t
mdu_lshift_left(uint32_t op, uint8_t shifts, uint32_t *res)
__reentrant
{
return mdu_lshift(op, shifts, 0, res);
}
uint8_t
mdu_lshift_right(uint32_t op, uint8_t shifts, uint32_t *res)
__reentrant
{
return mdu_lshift(op, shifts, 1, res);
}
/* arithmetic shifts */
uint8_t
mdu_ashift(int32_t op, int8_t shifts, int8_t right, int32_t *res)
__reentrant
{
MD0= op & 0xff;
MD1= (op >> 8) & 0xff;
MD2= (op >> 16) & 0xff;
MD3= (op >> 24) & 0xff;
MD4= (right?0x20:0) + (shifts&0x1f);
MDUCON= 0x10 + 0x07;
while (MDUSTAT & 0x04) ;
d= (uint32_t)MD0 + (uint32_t)MD1*256l + (uint32_t)MD2*256l*256l + (uint32_t)MD3*256l*256l*256l;
if (res)
*res= d;
return MDUSTAT & 0x02;
}
uint8_t
mdu_ashift_left(int32_t op, int8_t shifts, int32_t *res)
__reentrant
{
return mdu_lshift(op, shifts, 0, res);
}
uint8_t
mdu_ashift_right(int32_t op, int8_t shifts, int32_t *res)
__reentrant
{
return mdu_lshift(op, shifts, 1, res);
}
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