3、算术运算指令
3.1、加法指令
| 指令的语法 |
举例 |
周期数 |
| ADC reg,reg |
adc dx,cx |
1 |
| ADC mem,reg |
adc word ptr m16[2],dx |
3 |
| ADC reg,mem |
adc dx,dword ptr m32[2] |
2 |
| ADD reg,reg |
add ax,bx |
1 |
| ADD mem,reg |
add total, cx |
3 |
| ADD reg,mem |
add cx,incr |
2 |
| ADD reg,immed |
add bx,6 |
1 |
| ADD mem,immed |
add pointers[bx][si],6 |
3 |
| ADD accum,immed |
add ax,10 |
1 |
| INC reg |
inc bx |
1 |
| INC mem |
inc vpage |
3 |
| XADD reg,reg |
xadd dl,al |
3 |
| XADD mem,reg |
xadd string,bl |
4 |
3.2、减法指令
| SUB reg,reg |
sub ax,bx |
1 |
| SUB mem,reg |
sub array[di],bi |
3 |
| SUB reg,mem |
sub al,[bx] |
2 |
| SUB reg,immed |
sub bl,7 |
1 |
| SUB mem,immed |
sub total,4000 |
3 |
| SUB accum,immed |
sub ax,32000 |
1 |
| SBB accum,immed |
sbb ax,320 |
1 |
| SBB reg,immed |
sbb dx,45 |
1 |
| SBB mem,immed |
sbb word ptr m32[2],40 |
3 |
| SBB reg,reg |
sbb dx,cx |
1 |
| SBB mem,reg |
sbb word ptr m32[2],dx |
3 |
| SBB reg,mem |
sbb dx,word ptr m32[2] |
2 |
| DEC reg |
dec ax |
1 |
| DEC mem |
dec counter |
3 |
| NEG reg |
neg ax |
1 |
| NEG mem |
neg balance |
3 |
3.3、乘法指令
| MUL reg |
mul bx |
|
MUL memX |
mul word ptr [bx] |
8,16-bit=11 |
| 32-bit=10 |
| IMUL reg |
imul dx |
11 |
| IMUL mem |
imul factor |
11 |
| IMUL reg,immed |
imul cx,25 |
10 |
| IMUL reg,reg,immed |
imul dx,ax,18 |
10 |
| IMUL reg,mem,immed |
imul bx,[si],60 |
10 |
| IMUL reg,reg |
imul cx,ax |
10 |
| IMUL reg,mem |
imul dx,[si] |
10 |
3.4、除法指令
| DIV reg |
div cx |
byte=17 word=25 |
| DIV mem |
div [bx] |
dword=41 |
| IDIV reg |
idiv dl |
8-bit=22;16-bit=30 |
| IDIV mem |
idiv itemp |
32-bit=46 |
3.5、类型转换指令
| CBW |
cbw |
3 |
| CWD |
cwd |
2 |
| CWDE |
cwde |
3 |
| CDQ |
cdq |
2 |