Add x86-assembly

x86-assembly/src/control-flow/control-flow.s

@@ -0,0 +1,23 @@
+.data
+stop:
+	.int 3
+
+.text
+	.global _start
+
+_start:
+	mov $0, %rcx
+loop:
+	cmp stop, %rcx
+	# If equal, change RIP to exit.
+	je exit
+	inc %rcx
+	# Unconditionally change RIP to loop.
+	jmp loop
+exit:
+	# Try this: comment out the following three instructions.
+	# What happens if you assemble and link? Why?
+	# Think about RIP and the Fetch-Decode-Execute cycle.
+	mov $231, %rax
+        mov %rcx, %rdi # Exit code -- let's see the value of %rcx.
+        syscall