Q1:Convert the following C codes to equivalent IA-64 assembly codes as per the G
ID: 3717844 • Letter: Q
Question
Q1:Convert the following C codes to equivalent IA-64 assembly codes as per the GCC conventions.:
a) If else if else :
int compare(int a, int *b, int c) {
if (a > *b) return 1;
else if (a < *b)
if (c != a)
return 0;
else if (c > *b)
return -1;
else
return 0;
else return -1;}
===
b) Assume the functions get(), test(), and set() are already defined.
char ch1, ch2; // assume their values are taken from user input
switch (ch1) {
case ‘s’:
set(ch1);
case ‘t’:
ch2 = get(ch1);
switch(ch2) {
case 0:
test(0);
break;
default:
test(1);
}
break;}
====
c) Assume given a matrix A with number of rows N = 5 and number of columns M = 4.
int i, j, product = 1;
for (i=0; i<N; i++) {
for (j=0; j<M; j++)
product *= A[i][j];}
===
d) Factorial numbers
int factorial(int n) {
if (n == 1)
return 1;
else
return n * factorial (n-1);}
____________________________
( convert these code from c to assembly )
in simply assembly
like this example:
pushl %rbp
movl %rsp, %rbp
subl $4, %rsp
movl $0, -4(%rbp)
.L2:
movl -4(%rbp), %rax
cmpl 8(%rbp), %rax
jl .L5
jmp .L3
.L5:
decl 8(%rbp)
movl 12(%rbp), %rdx
leal -4(%rbp), %rax
addl %rdx, (%rax)
jmp .L2
.L3:
movl 8(%rbp), %rax
leave
ret
and stuff pls help
(in computer system language)
ASSEMBLY
Explanation / Answer
ANS:-
Given that,
PROGRAM:-
//a.
compare:
push rbp
mov rbp, rsp
mov DWORD PTR [rbp-4], edi
mov QWORD PTR [rbp-16], rsi
mov DWORD PTR [rbp-8], edx
mov rax, QWORD PTR [rbp-16]
mov eax, DWORD PTR [rax]
cmp DWORD PTR [rbp-4], eax
jle .L2
mov eax, 1
jmp .L3
.L2:
mov rax, QWORD PTR [rbp-16]
mov eax, DWORD PTR [rax]
cmp DWORD PTR [rbp-4], eax
jge .L4
mov eax, DWORD PTR [rbp-8]
cmp eax, DWORD PTR [rbp-4]
je .L5
mov eax, 0
jmp .L3
.L5:
mov rax, QWORD PTR [rbp-16]
mov eax, DWORD PTR [rax]
cmp DWORD PTR [rbp-8], eax
jle .L6
mov eax, -1
jmp .L3
.L6:
mov eax, 0
jmp .L3
.L4:
mov eax, -1
.L3:
pop rbp
ret
//b.
function:
push rbp
mov rbp, rsp
sub rsp, 16
movsx eax, BYTE PTR [rbp-1]
cmp eax, 115
je .L2
cmp eax, 116
je .L3
jmp .L7
.L2:
movsx eax, BYTE PTR [rbp-1]
mov edi, eax
mov eax, 0
call set
.L3:
movsx eax, BYTE PTR [rbp-1]
mov edi, eax
mov eax, 0
call get
mov BYTE PTR [rbp-2], al
movsx eax, BYTE PTR [rbp-2]
test eax, eax
jne .L5
mov edi, 0
mov eax, 0
call test
jmp .L6
.L5:
mov edi, 1
mov eax, 0
call test
.L6:
nop
.L7:
nop
leave
ret
//c.
func:
push rbp
mov rbp, rsp
push r15
push r14
push r13
push r12
push rbx
sub rsp, 56
mov rcx, rsp
mov r15, rcx
mov DWORD PTR [rbp-52], 1
mov DWORD PTR [rbp-64], 5
mov DWORD PTR [rbp-68], 4
mov ecx, DWORD PTR [rbp-68]
mov ebx, DWORD PTR [rbp-64]
movsx r12, ecx
sub r12, 1
mov QWORD PTR [rbp-80], r12
movsx r12, ecx
mov r13, r12
mov r14d, 0
movsx r12, ecx
lea r14, [0+r12*4]
movsx r12, ebx
sub r12, 1
mov QWORD PTR [rbp-88], r12
movsx r12, ecx
mov r10, r12
mov r11d, 0
movsx r12, ebx
mov rax, r12
mov edx, 0
mov r13, r11
imul r13, rax
mov r12, rdx
imul r12, r10
add r12, r13
mul r10
lea r10, [r12+rdx]
mov rdx, r10
movsx rax, ecx
mov r8, rax
mov r9d, 0
movsx rax, ebx
mov rsi, rax
mov edi, 0
mov rdx, r9
imul rdx, rsi
mov rax, rdi
imul rax, r8
lea r10, [rdx+rax]
mov rax, r8
mul rsi
lea rsi, [r10+rdx]
mov rdx, rsi
movsx rdx, ecx
movsx rax, ebx
imul rax, rdx
lea rdx, [0+rax*4]
mov eax, 16
sub rax, 1
add rax, rdx
mov edi, 16
mov edx, 0
div rdi
imul rax, rax, 16
sub rsp, rax
mov rax, rsp
add rax, 3
shr rax, 2
sal rax, 2
mov QWORD PTR [rbp-96], rax
mov DWORD PTR [rbp-60], 0
jmp .L2
.L5:
mov DWORD PTR [rbp-56], 1
jmp .L3
.L4:
mov rsi, r14
shr rsi, 2
mov rax, QWORD PTR [rbp-96]
mov edx, DWORD PTR [rbp-56]
movsx rcx, edx
mov edx, DWORD PTR [rbp-60]
movsx rdx, edx
imul rdx, rsi
add rdx, rcx
mov eax, DWORD PTR [rax+rdx*4]
mov edx, DWORD PTR [rbp-52]
imul eax, edx
mov DWORD PTR [rbp-52], eax
add DWORD PTR [rbp-56], 1
.L3:
mov eax, DWORD PTR [rbp-56]
cmp eax, DWORD PTR [rbp-68]
jl .L4
add DWORD PTR [rbp-60], 1
.L2:
mov eax, DWORD PTR [rbp-60]
cmp eax, DWORD PTR [rbp-64]
jl .L5
mov rsp, r15
nop
lea rsp, [rbp-40]
pop rbx
pop r12
pop r13
pop r14
pop r15
pop rbp
ret
//d.
factorial:
push rbp
mov rbp, rsp
sub rsp, 16
mov DWORD PTR [rbp-4], edi
cmp DWORD PTR [rbp-4], 1
jne .L2
mov eax, 1
jmp .L3
.L2:
mov eax, DWORD PTR [rbp-4]
sub eax, 1
mov edi, eax
call factorial
imul eax, DWORD PTR [rbp-4]
.L3:
leave
ret
Q3.
No assembly code generating for structures
struct r1{
int array[4];
int sum;
char ch1;
};
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