From 57368425d82fbccd8487e1e3aad5e6af9a97cd10 Mon Sep 17 00:00:00 2001
From: TiagoRG <tiago.rgarcia@ua.pt>
Date: Tue, 14 Nov 2023 11:27:35 +0000
Subject: [PATCH] [AC1] Finish aula03

Signed-off-by: TiagoRG <tiago.rgarcia@ua.pt>
---
 2ano/1semestre/ac1/aula03/ex1-addicional.asm | 51 ++++++++++++++++++
 2ano/1semestre/ac1/aula03/ex2-addicional.asm | 55 ++++++++++++++++++++
 2ano/1semestre/ac1/aula03/ex2-addicional.md  | 13 +++++
 3 files changed, 119 insertions(+)
 create mode 100644 2ano/1semestre/ac1/aula03/ex1-addicional.asm
 create mode 100644 2ano/1semestre/ac1/aula03/ex2-addicional.asm
 create mode 100644 2ano/1semestre/ac1/aula03/ex2-addicional.md

diff --git a/2ano/1semestre/ac1/aula03/ex1-addicional.asm b/2ano/1semestre/ac1/aula03/ex1-addicional.asm
new file mode 100644
index 0000000..25255a4
--- /dev/null
+++ b/2ano/1semestre/ac1/aula03/ex1-addicional.asm
@@ -0,0 +1,51 @@
+	.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
diff --git a/2ano/1semestre/ac1/aula03/ex2-addicional.asm b/2ano/1semestre/ac1/aula03/ex2-addicional.asm
new file mode 100644
index 0000000..ffe0143
--- /dev/null
+++ b/2ano/1semestre/ac1/aula03/ex2-addicional.asm
@@ -0,0 +1,55 @@
+	.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
diff --git a/2ano/1semestre/ac1/aula03/ex2-addicional.md b/2ano/1semestre/ac1/aula03/ex2-addicional.md
new file mode 100644
index 0000000..865fb97
--- /dev/null
+++ b/2ano/1semestre/ac1/aula03/ex2-addicional.md
@@ -0,0 +1,13 @@
+# 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))