Cours du 17 au 21 octobre

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diff --git a/semestre 3/architecture des ordinateurs/td/25-10-22.md b/semestre 3/architecture des ordinateurs/td/25-10-22.md
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+---
+tags:
+  - sorbonne
+  - informatique
+  - architecture-des-ordinateurs
+  - td
+semestre: 3
+---
+```asm
+# prologue
+addiu $29, $29, -8
+ori $8, $0, 12
+sw $8, 0($29)
+ori $8, $0, 3
+sw $8, 4($29)
+ori $8, $0, 5
+sw $8, 6($29)
+
+# épilogue
+addiu $29, $29, 8
+
+# @a = 0($29)
+# @b = 4($29)
+# @c = 6($29)
+```
+
+`"AaBb" = 0x41 0x61 0x42 0x62`
+`"0123456789" = 0x30 ... 0x39`
+`"1024" = 0x31 0x30 0x32 0x34`
+
+```asm
+.data
+ch:	.asciiz "1234"
+.text
+#main
+	lui $8, $0, 0x1001
+	ori $12, $0, 10
+while:
+	lbu $9, 0($8)
+	beq $9, $0, while_end
+	andiu $9, $9, 0x0F
+	mult $10, $12
+	mflo $10
+	addu $10, $9
+	addiu $11, 1
+	addiu $8, 1
+	j while
+while_end:
+# 
+```