Cours du 3 au 21 novembre

ce qui fait 3 semaines en philo et une semaine en info

1 files changed, 185 insertions, 0 deletions

diff --git a/semestre 3/architecture des ordinateurs/td/25-11-19.md b/semestre 3/architecture des ordinateurs/td/25-11-19.md
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+---
+tags:
+  - sorbonne
+  - informatique
+  - architecture-des-ordinateurs
+  - td
+semestre: 3
+---
+Les partiels ne sont pas très bon en général
+|> moyenne de 7.1, il y a eu une très bonne note
+
+---
+
+`$31` est géré par le CPU lors d'un `jal`
+
+```asm
+.data
+nmt: .word 15, -1, 124
+.text
+# main
+	# moyenne3(n, m, 5)
+	lui $8, $0, 0x1001
+	addiu $29, $29, -16 # pour pouvoir sauvegarder tmp si on ne l'optimise pas
+		# n
+	lw $9, 0($8)
+	sw $9, 0($8)
+	or $4, $0, $9
+		# m
+	lw $9, 4($8)
+	sw $9, 4($8)
+	or $5, $0, $9
+		# 9
+	ori $9, $0, 5
+	sw $9, 8($8)
+	or $6, $0, $9
+	jal moyenne3
+	addiu $29, $29, 12
+	
+	# affichage
+	or $4, $0, $2
+	ori $2, $0, 1
+	syscall
+	
+	# moyenne3(m, 1, m+5)
+	lui $8, $0, 0x1001
+	addiu $29, $29, -12
+		# m
+	lw $9, 4($8)
+	sw $9, 0($8)
+	or $4, $0, $9
+		# m
+	ori $9, $0, 1
+	sw $9, 4($8)
+	or $5, $0, $9
+		# 9
+	lw $9, 4($8)
+	addiu $9, $9, 5
+	sw $9, 8($8)
+	or $6, $0, $9
+	jal moyenne3
+	addiu $29, $29, 12
+	
+	# affichage
+	or $4, $0, $2
+	ori $2, $0, 1
+	syscall
+
+	# exit
+	addui $29, $29, 4
+	ori $2, $0, 10
+	syscall
+
+moyenne3:
+	addiu $29, $29, -12 # pour $31, $16 et pour la variable optimisée en registre
+	sw $31, 4($29)
+	sw $16, 8($29)
+	# $4 = p; $5 = q; $6 = r
+	or $16, $0, $0
+	addu $16, $4, $5
+	addu $16, $16, $6
+	ori $9, $0, 3
+	div $16, 3
+	mflo $2
+	lw $31, 4($29)
+	lw $16, 8($29)
+	addiu $29, $29, 8
+	jr $31
+```
+
+```asm
+.data
+nml: .word 15, -1, 124
+.text
+# main
+	# moyenne3(n, m, 5)
+	lui $8, $0, 0x1001
+	addiu $29, $29, -16 # pour pouvoir sauvegarder tmp si on ne l'optimise pas
+		# n
+	lw $9, 0($8)
+	sw $9, 0($20)
+	or $4, $0, $9
+		# m
+	lw $9, 4($8)
+	sw $9, 4($20)
+	or $5, $0, $9
+		# 9
+	ori $9, $0, 5
+	sw $9, 8($20)
+	or $6, $0, $9
+	jal moyenne3
+	addiu $29, $29, 12
+	
+	# affichage
+	or $4, $0, $2
+	ori $2, $0, 1
+	syscall
+	
+	# moyenne5(m, 1, m+5, 12, 35)
+	lui $8, $0, 0x1001
+	addiu $29, $29, -20
+		# m
+	lw $9, 4($8)
+	sw $9, 0($29)
+	or $4, $0, $9
+		# 1
+	ori $9, $0, 1
+	sw $9, 4($29)
+	or $5, $0, $9
+		# m+5
+	lw $9, 4($8)
+	addiu $9, $9, 5
+	sw $9, 8($29)
+	or $6, $0, $9
+		# 12
+	ori $9, $0, 12
+	sw $9, 12($29)
+	or $7, $0, $9
+		# 35
+	ori $9, $0, 35
+	sw $9, 16($29)
+	# on ne peut pas mettre $9 dans $8 car $8 ne contient pas un paramètre de fonction
+	jal moyenne5
+	addiu $29, $29, 20
+	
+	# affichage
+	or $4, $0, $2
+	ori $2, $0, 1
+	syscall
+
+	# exit
+	addui $29, $29, 4
+	ori $2, $0, 10
+	syscall
+
+moyenne3:
+	addiu $29, $29, -12 # pour $31, $16 et pour la variable optimisée en registre
+	sw $31, 4($29)
+	sw $16, 8($29)
+	# $4 = p; $5 = q; $6 = r
+	or $16, $0, $0
+	addu $16, $4, $5
+	addu $16, $16, $6
+	ori $9, $0, 3
+	div $16, 3
+	mflo $2
+	lw $31, 4($29)
+	lw $16, 8($29)
+	addiu $29, $29, 8
+	jr $31
+
+moyenne5:
+	addiu $29, $29, -12 # pour $31, $16 et pour la variable optimisée en registre
+	sw $31, 4($29)
+	sw $16, 8($29)
+	lw $10, 28($29)
+	addu $16, $4, $5
+	addu $16, $16, $6
+	addu $16, $16, $7
+	addu $16, $16, $10
+	ori $9, $0, 5
+	div $16, 5
+	lw $31, 4($29)
+	lw $16, 8($29)
+	jr $31
+```
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