SH-2A Datasheet, PDF (202/501 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 6 Instruction Descriptions
Operation
DIV1(long m,long n)
/* DIV1 Rm,Rn */
{
unsigned long tmp0;
unsigned char old_q,tmp1;
old_q=Q;
Q=(unsigned char)((0x80000000 & R[n])!=0);
R[n]<<=1;
R[n]|=(unsigned long)T;
switch(old_q){
case 0:switch(M){
case 0:tmp0=R[n];
R[n]-=R[m];
tmp1=(R[n]>tmp0);
switch(Q){
case 0:Q=tmp1;
break;
case 1:Q=(unsigned char)(tmp1==0);
break;
}
break;
case 1:tmp0=R[n];
R[n]+=R[m];
tmp1=(R[n]<tmp0);
switch(Q){
case 0:Q=(unsigned char)(tmp1==0);
break;
case 1:Q=tmp1;
break;
}
break;
}
break;
Rev. 3.00 Jul 08, 2005 page 188 of 484
REJ09B0051-0300