24531904_j

操作 : if (PR[qp]) {
if (p1 == p2)
illegal_operation_fault();
tmp_nat = (register_form ? GR[r 2 ].nat : 0) || GR[r 3 ].nat;
if (register_form)
tmp_src = GR[r 2 ];
else if (imm8_form)
tmp_src = sign_ext(imm 8 , 8);
else // parallel_inequality_form
tmp_src = 0;
if (crel == ‘eq’) tmp_rel = tmp_src == GR[r 3 ];
else if (crel == ‘ne’) tmp_rel = tmp_src != GR[r 3 ];
else if (crel == ‘lt’) tmp_rel = lesser_signed(tmp_src, GR[r 3 ]);
else if (crel == ‘le’) tmp_rel = lesser_equal_signed(tmp_src, GR[r 3 ]);
else if (crel == ‘gt’) tmp_rel = greater_signed(tmp_src, GR[r 3 ]);
else if (crel == ‘ge’) tmp_rel = greater_equal_signed(tmp_src, GR[r 3 ]);
else if (crel == ‘ltu’) tmp_rel = lesser(tmp_src, GR[r 3 ]);
else if (crel == ‘leu’) tmp_rel = lesser_equal(tmp_src, GR[r 3 ]);
else if (crel == ‘gtu’) tmp_rel = greater(tmp_src, GR[r 3 ]);
else tmp_rel = greater_equal(tmp_src, GR[r 3 ]);//‘geu’
switch (ctype) {
case ‘and’: // and-type compare
if (tmp_nat || !tmp_rel) {
PR[p 1 ] = 0;
PR[p 2 ] = 0;
}
break;
case ‘or’: // or-type compare
if (!tmp_nat && tmp_rel) {
PR[p 1 ] = 1;
PR[p 2] = 1;
}
break;
case ‘or.andcm’: // or.andcm-type compare
if (!tmp_nat && tmp_rel) {
PR[p 1 ] = 1;
PR[p 2] = 0;
}
break;
case ‘unc’: // unc-type compare
default: // normal compare
if (tmp_nat) {
PR[p 1] = 0;
PR[p 2 ] = 0;
} else {
PR[p 1] = tmp_rel;
PR[p 2 ] = !tmp_rel;
}
break;
}
} else {
if (ctype == ‘unc’) {
if (p1 == p2)
illegal_operation_fault();
PR[p 1] = 0;
PR[p 2 ] = 0;
}
}
割り込み : 無効操作フ ォ ル ト
3:36 第 3 巻 : 命令リファレンス
cmp