Assembly Language Implement each design given below. Assume that value is stored
ID: 3809294 • Letter: A
Question
Assembly Language
Implement each design given below. Assume that value is stored as a doubleword in memory, number is in EAX, and count is in ECX.
(a)
number := 0;
value := 500;
while number £ 60 and value > 200 loop
subtract number from value;
add 5 to number;
end while;
(b)
while (count < 100) and (value 500) loop
add count to value;
add 2 to count;
end while;
(c)
while (count < 100) or (value 500) loop
add count to value;
add 2 to count;
end while;
(d)
number := 0;
value := 500;
while number £ 100 or value > 300 loop
subtract number from value;
add 5 to number;
end while;
Explanation / Answer
a.) .LC0:
.string " "
main:
push rbp
mov rbp, rsp
sub rsp, 16
mov DWORD PTR [rbp-4], 0
mov DWORD PTR [rbp-8], 500
.L3:
cmp DWORD PTR [rbp-4], 59
jg .L2
cmp DWORD PTR [rbp-8], 200
jle .L2
mov eax, DWORD PTR [rbp-8]
sub eax, DWORD PTR [rbp-4]
mov DWORD PTR [rbp-12], eax
add DWORD PTR [rbp-4], 5
mov eax, DWORD PTR [rbp-12]
mov esi, eax
mov edi, OFFSET FLAT:std::cout
call std::basic_ostream<char, std::char_traits<char> >::operator<<(int)
mov esi, OFFSET FLAT:.LC0
mov edi, OFFSET FLAT:std::cout
call std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)
jmp .L3
.L2:
mov eax, 0
leave
ret
__static_initialization_and_destruction_0(int, int):
push rbp
mov rbp, rsp
sub rsp, 16
mov DWORD PTR [rbp-4], edi
mov DWORD PTR [rbp-8], esi
cmp DWORD PTR [rbp-4], 1
jne .L7
cmp DWORD PTR [rbp-8], 65535
jne .L7
mov edi, OFFSET FLAT:std::__ioinit
call std::ios_base::Init::Init()
mov edx, OFFSET FLAT:__dso_handle
mov esi, OFFSET FLAT:std::__ioinit
mov edi, OFFSET FLAT:std::ios_base::Init::~Init()
call __cxa_atexit
.L7:
nop
leave
ret
_GLOBAL__sub_I_main:
push rbp
mov rbp, rsp
mov esi, 65535
mov edi, 1
call __static_initialization_and_destruction_0(int, int)
pop rbp
ret
b.) .LC0:
.string " "
main:
push rbp
mov rbp, rsp
sub rsp, 16
mov DWORD PTR [rbp-4], 0
mov DWORD PTR [rbp-8], 500
.L3:
cmp DWORD PTR [rbp-4], 99
jg .L2
cmp DWORD PTR [rbp-8], 500
jg .L2
mov edx, DWORD PTR [rbp-4]
mov eax, DWORD PTR [rbp-8]
add eax, edx
mov DWORD PTR [rbp-12], eax
add DWORD PTR [rbp-4], 2
mov eax, DWORD PTR [rbp-12]
mov esi, eax
mov edi, OFFSET FLAT:std::cout
call std::basic_ostream<char, std::char_traits<char> >::operator<<(int)
mov esi, OFFSET FLAT:.LC0
mov rdi, rax
call std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)
jmp .L3
.L2:
mov eax, 0
leave
ret
__static_initialization_and_destruction_0(int, int):
push rbp
mov rbp, rsp
sub rsp, 16
mov DWORD PTR [rbp-4], edi
mov DWORD PTR [rbp-8], esi
cmp DWORD PTR [rbp-4], 1
jne .L7
cmp DWORD PTR [rbp-8], 65535
jne .L7
mov edi, OFFSET FLAT:std::__ioinit
call std::ios_base::Init::Init()
mov edx, OFFSET FLAT:__dso_handle
mov esi, OFFSET FLAT:std::__ioinit
mov edi, OFFSET FLAT:std::ios_base::Init::~Init()
call __cxa_atexit
.L7:
nop
leave
ret
_GLOBAL__sub_I_main:
push rbp
mov rbp, rsp
mov esi, 65535
mov edi, 1
call __static_initialization_and_destruction_0(int, int)
pop rbp
ret
c.) .LC0:
.string " "
main:
push rbp
mov rbp, rsp
sub rsp, 16
mov DWORD PTR [rbp-4], 0
mov DWORD PTR [rbp-8], 500
.L4:
cmp DWORD PTR [rbp-4], 99
jle .L2
cmp DWORD PTR [rbp-8], 500
jg .L3
.L2:
mov edx, DWORD PTR [rbp-4]
mov eax, DWORD PTR [rbp-8]
add eax, edx
mov DWORD PTR [rbp-12], eax
add DWORD PTR [rbp-4], 2
mov eax, DWORD PTR [rbp-12]
mov esi, eax
mov edi, OFFSET FLAT:std::cout
call std::basic_ostream<char, std::char_traits<char> >::operator<<(int)
mov esi, OFFSET FLAT:.LC0
mov rdi, rax
call std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)
jmp .L4
.L3:
mov eax, 0
leave
ret
__static_initialization_and_destruction_0(int, int):
push rbp
mov rbp, rsp
sub rsp, 16
mov DWORD PTR [rbp-4], edi
mov DWORD PTR [rbp-8], esi
cmp DWORD PTR [rbp-4], 1
jne .L8
cmp DWORD PTR [rbp-8], 65535
jne .L8
mov edi, OFFSET FLAT:std::__ioinit
call std::ios_base::Init::Init()
mov edx, OFFSET FLAT:__dso_handle
mov esi, OFFSET FLAT:std::__ioinit
mov edi, OFFSET FLAT:std::ios_base::Init::~Init()
call __cxa_atexit
.L8:
nop
leave
ret
_GLOBAL__sub_I_main:
push rbp
mov rbp, rsp
mov esi, 65535
mov edi, 1
call __static_initialization_and_destruction_0(int, int)
pop rbp
ret
d.) .LC0:
.string " "
main:
push rbp
mov rbp, rsp
sub rsp, 16
mov DWORD PTR [rbp-4], 0
mov DWORD PTR [rbp-8], 500
.L4:
cmp DWORD PTR [rbp-4], 99
jle .L2
cmp DWORD PTR [rbp-8], 300
jle .L3
.L2:
mov edx, DWORD PTR [rbp-8]
mov eax, DWORD PTR [rbp-4]
add eax, edx
mov DWORD PTR [rbp-12], eax
add DWORD PTR [rbp-4], 5
mov eax, DWORD PTR [rbp-12]
mov esi, eax
mov edi, OFFSET FLAT:std::cout
call std::basic_ostream<char, std::char_traits<char> >::operator<<(int)
mov esi, OFFSET FLAT:.LC0
mov rdi, rax
call std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)
jmp .L4
.L3:
mov eax, 0
leave
ret
__static_initialization_and_destruction_0(int, int):
push rbp
mov rbp, rsp
sub rsp, 16
mov DWORD PTR [rbp-4], edi
mov DWORD PTR [rbp-8], esi
cmp DWORD PTR [rbp-4], 1
jne .L8
cmp DWORD PTR [rbp-8], 65535
jne .L8
mov edi, OFFSET FLAT:std::__ioinit
call std::ios_base::Init::Init()
mov edx, OFFSET FLAT:__dso_handle
mov esi, OFFSET FLAT:std::__ioinit
mov edi, OFFSET FLAT:std::ios_base::Init::~Init()
call __cxa_atexit
.L8:
nop
leave
ret
_GLOBAL__sub_I_main:
push rbp
mov rbp, rsp
mov esi, 65535
mov edi, 1
call __static_initialization_and_destruction_0(int, int)
pop rbp
ret
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