Question

Convert the high level language programming statementts to 80x86 assembly, Assume X=AX and y=BX

for (i=1; i<10; ++i){

x=x+1;

y=y-1;

}

if(x>=y)

y=x-1;

else

y=x+1;

Answer 1

Question:

Convert the high level language programming statementts to 80x86 assembly, Assume X=AX and y=BX

for (i=1; i<10; ++i){

x=x+1;

y=y-1;

}

if(x>=y)

y=x-1;

else

y=x+1;

Answer with Clear Information:

Above High Level Code need to be modified as shown below to make it compatible with gcc/g++ compiler options.

Modified code is mentioned in bold

void main()

{

int i,x,y;

for (i=1; i<10; ++i){

x=x+1;

y=y-1;

}

if(x>=y)

y=x-1;

else

y=x+1;

}

After changing the above code, it was compiled and executed properly.

8086 Assembly Code for the same is written as follows:

==============================================

_i$ = -12 ; size = 4

_y$ = -8 ; size = 4

_x$ = -4 ; size = 4

_main PROC

push ebp

mov ebp, esp

sub esp, 12 ; 0000000cH

mov DWORD PTR _i$[ebp], 1

jmp SHORT $LN4@main

$LN2@main:

mov eax, DWORD PTR _i$[ebp]

add eax, 1

mov DWORD PTR _i$[ebp], eax

$LN4@main:

cmp DWORD PTR _i$[ebp], 10 ; 0000000aH

jge SHORT $LN3@main

mov ecx, DWORD PTR _x$[ebp]

add ecx, 1

mov DWORD PTR _x$[ebp], ecx

mov edx, DWORD PTR _y$[ebp]

sub edx, 1

mov DWORD PTR _y$[ebp], edx

jmp SHORT $LN2@main

$LN3@main:

mov eax, DWORD PTR _x$[ebp]

cmp eax, DWORD PTR _y$[ebp]

jl SHORT $LN5@main

mov ecx, DWORD PTR _x$[ebp]

sub ecx, 1

mov DWORD PTR _y$[ebp], ecx

jmp SHORT $LN1@main

$LN5@main:

mov edx, DWORD PTR _x$[ebp]

add edx, 1

mov DWORD PTR _y$[ebp], edx

$LN1@main:

xor eax, eax

mov esp, ebp

pop ebp

ret 0

_main ENDP

==============================================

Compile and Execute the above 8086 Assembly Code in 8085/8086 compatible operating systems. Validate and Verify the output results.