GCC compiled output of fibonacci.c

fibonacci.s

  .file	"fibonacci.c"
	.text
.globl fib
	.type	fib, @function
fib:
	pushl	%ebx
	subl	$24, %esp
	cmpl	$1, 32(%esp)
	jg	.L2
	movl	32(%esp), %eax
	jmp	.L3
.L2:
	movl	32(%esp), %eax
	subl	$1, %eax
	movl	%eax, (%esp)
	call	fib
	movl	%eax, %ebx
	movl	32(%esp), %eax
	subl	$2, %eax
	movl	%eax, (%esp)
	call	fib
	leal	(%ebx,%eax), %eax
.L3:
	addl	$24, %esp
	popl	%ebx
	ret
	.size	fib, .-fib
	.ident	"GCC: (Ubuntu 4.4.3-4ubuntu5) 4.4.3"
	.section	.note.GNU-stack,"",@progbits