Assembly Language Programming in Intel 8086: Multiplication, Division, and Array Handling
Assembly Lang. – Intel 8086
Ch. 9 & 10
•
MUL – unsigned multiplication
•
IMUL – integer multiply – for signed
multiplication
•
If 2 bytes r multiplied
product is Word [16
bits]
•
If 2 words …
double-word [32 bits]
•
Byte form –
–
MUL
source ;source= register, mem; not const.
–
One no. is in ‘source’
–
Another no. is in AL
–
Product is in AX
•
Word form
–
Source ; 16-bit reg/mem – not const.
–
AX
–
MSB in DX, LSB in AX [DX:AX]
Q.
A = 5xA – 12xB
A, B = word variables.
No overflow.
MOV
AX, 5
IMUL
A
;AX=5xA
MOV
A,AX
;A=5A
MOV
AX,12
;AX=12
IMUL
B
;AX=12B
SUB
A,AX
;A=5A – 12B
Q. Factorial that will compute N!
DIV, IDIV
•
DIV – divide – unsigned division
•
IDIV – integer divide
–
DIV
divisor
Byte form:
•
Divisor
8-bt reg/mem
•
Dividend
16-bit in AX
•
After division, Quotient
8-bit in AL
•
…, Remainder
8-bit in AH
15 ÷ 3 = 5,
3
is the
divisor
Word form:
•
Divisor
16-bit reg/mem
•
Dividend
32-bit in DX:AX
•
After division, Quotient
16-bit in AX
•
…, Remainder
16-bit in DX
Divide overflow
Ch. 10
•
1-D array
•
DUP – to define arrays whose elements share a
common initial value
•
E.g.,
GAMMA
DW
100
DUP (0)
Sets up an array of 100 words, with each entry –
initialized to 0.
GAMMA
DW
100
DUP (?)
Sets up an array of 100 words, with each entry –
UN
-initialized.
•
DUPs may be nested…
Assembly language programming in Intel 8086 involves operations like unsigned and signed multiplication using MUL and IMUL instructions, respectively, along with division using DIV and IDIV instructions. This programming also encompasses handling arrays through the use of DUP to define arrays with common initial values and the nesting of DUPs for more complex data structures.
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Presentation Transcript
Assembly Lang. Intel 8086 Ch. 9 & 10 MUL unsigned multiplication IMUL integer multiply for signed multiplication If 2 bytes r multiplied product is Word [16 bits] If 2 words double-word [32 bits]
Byte form MUL source ;source= register, mem; not const. One no. is in source Another no. is in AL Product is in AX
Word form Source ; 16-bit reg/mem not const. AX MSB in DX, LSB in AX [DX:AX]
Q. A = 5xA 12xB A, B = word variables. No overflow. MOV IMUL MOV MOV IMUL SUB AX, 5 A A,AX AX,12 B A,AX ;AX=5xA ;A=5A ;AX=12 ;AX=12B ;A=5A 12B
DIV, IDIV DIV divide unsigned division IDIV integer divide DIV divisor 15 3 = 5, 3 is the divisor Byte form: Divisor 8-bt reg/mem Dividend 16-bit in AX After division, Quotient 8-bit in AL , Remainder 8-bit in AH
Word form: Divisor 16-bit reg/mem Dividend 32-bit in DX:AX After division, Quotient 16-bit in AX , Remainder 16-bit in DX
Ch. 10 1-D array DUP to define arrays whose elements share a common initial value E.g., GAMMA DW 100 Sets up an array of 100 words, with each entry initialized to 0. GAMMA DW 100 Sets up an array of 100 words, with each entry UN-initialized. DUP (0) DUP (?)
