Lista de Exercícios de Assembly

bissexto.asm

# Considerando que o ano está em $7

main: # Divisíveis por 400 são bissextos
      addi $8, $0, 400
      div $7, $8
      mfhi $9
      beq $9, 0, bissexto

      # Divisíveis por 100 e não por 400 não são bissextos
      addi $8, $0, 100
      div $7, $8
      mfhi $9
      beq $9, $0, nao_bissexto

      # Divisíveis por 4 e não por 100 são bissextos
      addi $8, $0, 4
      div $7, $8
      mfhi $9
      beq $9, $0, bissexto

      # Todos os outros não são bissextos
      j nao_bissexto

bissexto:     
      addi $11, $0, 1

nao_bissexto:
      nop

fibonacci.asm

main: addi $8, $0, 10 #Calcular os 10 primeiros elementos da série de fibonacci

      addi $7, $0, 1 #Primeiro elemento da série de fibonacci - 1
      addi $8, $8, -1

for:  beq $8, $0, end
      add $9, $10, $0 # $9 = fib(i - 2)
      add $10, $7, $0 # $10 = fib(i - 1)
      add $7, $10, $9 # fib(i) = fib(i - 1) + fib)(i - 2)
      addi $8, $8, -1
      j for
end:  nop

pascoa.asm

# Baseado em http://astro.if.ufrgs.br/pascoa.htm
# Considerando que ano está em $7
#  c = a/100
#  n = a - [19×(a/19)]
#  k = (c - 17)/25
#  i = c - c/4 - [(c-k)/3] +(19×n) + 15
#  i = i - [30×(i/30)]
#  i = i - {(i/28)×[1-(i/28)]×[29/(i+1)]×[(21-n)/11]}
#  j = a + a/4 + i + 2 -c + c/4
#  j = j - [7×(j/7)]
#  l = i - j
#  m = 3 + [(l+40)/44]
#  d = l + 28 - [31×(m/4)]

# $7  = ano
# $8  = mês
# $9  = dia
# $10 = 19
# $11 = c
# $12 = n
# $13 = k
# $14 = i
# $15 = j
# $16 = l

main: addi $7, $0, 2000
      addi $10, $0, 100
      div $7, $10
      mflo $11 # c = a/100

      addi $10, $0, 19
      div $7, $10
      mflo $12 # a/19
      mul $12, $12, $10 # 19 * (a/19)
      sub $12, $7, $12 # n = a - [19 * (a/19)]
      
      addi $13, $0, 25
      addi $14, $11, -17 # c - 17
      div $14, $13 # (c - 17) / 25
      mflo $13 # k = (c - 17) / 25
      
      addi $17, $0, 4
      addi $15, $0, 3
      sub $16, $11, $13 # (c-k)
      div $16, $15
      mflo $15          # (c-k)/3
      mul $16, $10, $12 # (19 * n)
      div $11, $17
      mflo $17          # (c/4)
      sub $14, $11, $17 # c - c/4
      sub $14, $14, $15 # c - (c/4) - [(c - k)/3]
      add $14, $14, $16
      addi $14, $14, 15 # i = c - c/4 - [(c-k)/3] +(19×n) + 15

      # i = i - [30 * (i / 30)]
      addi $15, $0, 30
      div $14, $15
      mflo $16
      mul $16, $15, $16
      sub $14, $14, $16

      #  i = i - { (i/28) × [1- (i/28)] × [29/(i+1)] × [(21-n)/11] }
      addi $15, $0, 21
      sub $15, $15, $12 # 21 - n
      addi $16, $0, 11
      div $15, $11
      mflo $15 # [(21-n)/11]
      
      addi $16, $0, 29
      addi $17, $14, 1
      div $16, $17
      mflo $16 # [29/(i+1)]

      addi $17, $0, 28
      div $14, $17
      mflo $17 # i/28
      addi $18, $0, 1
      sub $18, $18, $17 # 1 - (i/28)

      mul $19, $17, $18 # (i/28) * [1 - i/28]
      mul $19, $19, $16
      mul $19, $19, $15

      sub $14, $14, $19

      #  j = a + a/4 + i + 2 -c + c/4
      addi $15, $0, 4
      div $7, $15
      mflo $16 #a/4

      div $11, $15
      mflo $17 #c/4

      add $15, $7, $16
      add $15, $15, $14
      addi $15, $15, 2
      sub $15, $15, $11
      add $15, $15, $17
      
      #j = j - [7×(j/7)]
      addi $16, $0, 7
      div $15, $16
      mflo $17
      mul $16, $16, $17
      sub $15, $15, $16

      # l = i - j
      sub $16, $14, $15
   
      # mês = 3 + [(l+40)/44]
      addi $8, $16, 40
      addi $18, $0, 44
      div $8, $18
      mflo $8
      addi $8, $8, 3

      # dia = l + 28 - [31×(mês/4)]
      addi $17, $0, 4
      div $8, $17
      mflo $17
      addi $18, $0, 31
      mul $17, $18, $17
      addi $9, $16, 28
      sub $9, $9, $17