# At&t compiles basic mathematical functions

Source: Internet
Author: User

. Section. Data
VAL:

Val1:

Output:

. Asciz "the RES is % QD \ n"

. Section. Text
. Globl _ start

_ Start:

Movl Val, % eax

Movl Val + 4, % EBX

Movl val1, % ECx

Movl val1 + 4, % edX

Addl % eax, % ECx

Adcl % EBX, % edX

Pushl % edX

Pushl % ECx

Pushl \$ output

Call printf

Movl \$1, % eax

Movl \$0, % EBX

Int \$0x80

Subtraction:

. Section. Data
VAL:

Val1:

Output:

. Asciz "the RES is % QD \ n"

. Section. Text
. Globl _ start
_ Start:

Movl val1, % eax

Movl val1 + 4, % EBX

Movl Val, % ECx

Movl Val + 4, % edX

Subl % eax, % ECx

Sbbl % EBX, % edX

Pushl % edX

Pushl % ECx

Pushl \$ output

Call printf

Movl \$1, % eax

Movl \$0, % EBX

Int \$0x80

Multiplication:

1. The Mul command can only be used for unsigned integers:

. Section. Data
VAL:

. Int 316722

Val1:

. Int 129907

Result:

Output:

. Asciz "the RES is % QD \ n"

. Section. Text
. Globl _ start
_ Start:

Movl Val, % eax

Mull val1

Movl % eax, result

Movl % edX, result + 4

Pushl result + 4

Pushl result

Pushl \$ output

Call printf

Movl \$1, % eax

Movl \$0, % EBX

Int \$0x80

2. imul can be used for signed and unsigned integers:

Imul des (Al, ax, eax is the implicit operand, and the product result is stored in the ax register or DX: ax register pair or edX: eax register pair)

Imul SRC, des (SRC can be a 16 or 32-bit register or memory, des must be a 16 or 32-bit general-purpose register)

Imul multi, SRC, des (the result of rapid multiplication between Multi and SRC is stored in des)

. Section. Data
VAL:

. Int 10

Val1:

. Int 12

Val2:

. Int 100

Output:

. Asciz "the RES is % QD \ n"

. Section. Text
. Globl _ start
_ Start:

Movl Val, % eax

Movl val1, % EBX

Imull % eax, % EBX

Movl val2, % edX

Imull \$4, % edX, % ECx

Movl \$1, % eax

Movl \$0, % EBX

Int \$0x80

Division:

1. Unsigned Division

 Divisor Divisor Length Vendors Remainder Ax 16-bit Al Ah DX: ax 32-bit Ax DX EdX: eax 64-bit Eax EdX

Div Divisor

. Section. Data
Dividend:

Divisor:

. Int 35

Quotient:

. Int 0

Remainder:

. Int 0

Output:

. Asciz "quotient is % d, remainder is % d \ n"

. Section. Text
. Globl _ start
_ Start:

Movl dividend, % eax

Movl dividend + 4, % edX

Divl Divisor

Movl % eax, quotient

Movl % edX, remainder

Pushl Remainder

Pushl quotient

Pushl \$ output

Call printf

Addl \$12, % ESP

Movl \$1, % eax

Movl \$0, % EBX

Int \$0x80

2. The idiv divisor division with symbols is similar

At&t compiles basic mathematical functions

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