[AC1] Finish aula03

Signed-off-by: TiagoRG <tiago.rgarcia@ua.pt>
This commit is contained in:
Tiago Garcia 2023-11-14 11:27:35 +00:00
parent 50e1710cf3
commit 4382b947ea
Signed by: TiagoRG
GPG Key ID: DFCD48E3F420DB42
3 changed files with 119 additions and 0 deletions

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.data
str1: .asciiz "Introduza um numero: "
str2: .asciiz "\nValor em codigo gray: "
str3: .asciiz "\nValor em binario: "
.eqv print_int, 1
.eqv print_string, 4
.eqv read_int, 5
.text
.globl main
# Mapa de registos
# gray: $t0
# bin: $t1
# mask: $t2
main: li $v0, print_string
la $a0, str1
syscall # print_string("Introduza um numero: ");
li $v0, read_int
syscall # read_int();
move $t0, $v0 # gray = read_int();
srl $t2, $t0, 1 # mask = gray >> 1;
move $t1, $t0 # bin = gray;
while: beq $t2, 0, done # while (mask != 0) {
xor $t1, $t1, $t2 # bin = bin ^ mask;
srl $t2, $t2, 1 # mask = mask >> 1;
j while # }
done:
li $v0, print_string
la $a0, str2
syscall # print_string("\nValor em codigo gray: ");
li $v0, print_int
move $a0, $t0
syscall # print_int(gray);
li $v0, print_string
la $a0, str3
syscall # print_string("\nValor em binario: ");
li $v0, print_int
move $a0, $t1
syscall # print_int(bin);
jr $ra

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.data
str1: .asciiz "Introduza dois numeros: "
str2: .asciiz "Resultado: "
.eqv print_int, 1
.eqv print_string, 4
.eqv read_int, 5
.text
.globl main
# Mapa de registos
# $t0: res
# $t1: mdor
# $t2: mdo
# $t3: i
main: la $a0, str1
li $v0, print_string
syscall # print_string("Introduza dois numeros: ");
li $v0, read_int
syscall # read_int()
move $t1, $v0 # mdor = read_int();
andi $t1, $t1, 0x0000FFFF # mdor = mdor & 0x0000FFFF;
li $v0, read_int
syscall # read_int()
move $t2, $v0 # mdo = read_int();
andi $t2, $t2, 0x0000FFFF # mdo = mdo & 0x0000FFFF;
li $t0, 0 # res = 0;
li $t3, 0 # i = 0;
while: beq $t1, 0, endw # while (mdor != 0)
bge $t3, 16, endw # while (i < 4) {
if: andi $t4, $t1, 0x00000001 # $t4 = mdor & 0x00000001;
beq $t4, 0, else
add $t0, $t0, $t2 # res = res + mdo;
else: sll $t2, $t2, 1 # mdo = mdo << 1;
srl $t1, $t1, 1 # mdor = mdor >> 1;
addi $t3, $t3, 1 # i++;
j while # }
endw: la $a0, str2
li $v0, print_string
syscall # print_string("Resultado: ");
li $v0, print_int
move $a0, $t0 # print_int(res);
syscall
jr $ra # return

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# Alinea b)
| mdor | mdo | i | res | |
|:----:|:----:|:-:|:----:|:-------------------|
| 0x0B | 0x06 | 0 | 0x00 | Valores iniciais |
| 0x05 | 0x0C | 1 | 0x06 | Fim da 1ª iteração |
| 0x02 | 0x18 | 2 | 0x12 | Fim da 2ª iteração |
| 0x01 | 0x30 | 3 | 0x12 | Fim da 3ª iteração |
| 0x00 | 0x60 | 4 | 0x42 | Fim da 4ª iteração |
# Alinea c)
Tudo o que é necessário fazer é alterar a condição do `if` para comparar o `i` a 16 em vez de 4 ([linha 34 no código de assembly](https://github.com/TiagoRG/uaveiro-leci/tree/master/2ano/1semestre/ac1/aula03/ex2-addicional.asm))