myfunc.s

	.file	"example.c"						# filename
	.text												# store in text section
	.globl	myfunc							# exported symbol
	.type	myfunc, @function			#
myfunc:												# function name
.LFB0:
	.cfi_startproc							#### PROLOGUE
	pushq	%rbp									# push base pointer (64bit) onto the stack
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp						# start a new stack frame, 
                              # move the value of stack pointer to base pointer
	.cfi_def_cfa_register 6
															#### PROLOGUE END

	movl	%edi, -20(%rbp)				# move 32bit reg value onto stack
	movq	$0, -16(%rbp)					# move the 64bit value 0 into the address pointed to by rbp -16
	movl	$0, -4(%rbp)					# zero a few bytes...?
	jmp	.L2											# jump to label
.L5:
	movl	-4(%rbp), %eax				# put 0 in eax
	imull	-20(%rbp), %eax				# multiply src x dest ; i.e. value * 0
	cltq												# sign-extend the value in eax to fill rax
	addq	%rax, -16(%rbp)				# rax + 0
	movl	-4(%rbp), %eax				# reset eax
	andl	$1, %eax							# bitwise AND 0b1 & eax
	testl	%eax, %eax
	je	.L3											# goto L3
	movq	globl_cnt(%rip), %rax	# rdx = (&rip + globl_cnt)
	subq	-16(%rbp), %rax				# result = rax - (&rbp - 16)
	movq	%rax, globl_cnt(%rip) # store result
	jmp	.L4
.L3:													# globl_cnt is a global counter of the type “long int” external to the function.
	movq	globl_cnt(%rip), %rdx # offset globl_cnt bytes from intruction pointer and move value to rdx
	movq	-16(%rbp), %rax				# move basepointer -16 bytes to rax
	addq	%rdx, %rax						# rdx + rax
	movq	%rax, globl_cnt(%rip) # move result to offset instruction pointer
.L4:
	addl	$1, -4(%rbp)					# (rbp add -4 bytes) + 1 ;  i.e. increment some variable
.L2:													#
	movl	-4(%rbp), %eax				# move the value 4 bytes below the base pointer to eax register
	cmpl	-20(%rbp), %eax				# compare the value 0x20 bytes below the base pointer with the value in eax register (0?)
	jl	.L5											# jump to L5 if value < 0
	nop
	popq	%rbp									# pop the parent stack frame address
	.cfi_def_cfa 7, 8
	ret													# pop return address and jump there
	.cfi_endproc
.LFE0:
	.size	myfunc, .-myfunc
	.ident	"GCC: (GNU) 6.1.0"
	.section	.note.GNU-stack,"",@progbits