Quick assembly demo

same_in_c.c

int myFunc(int x, int y) {
  return x + y
}

int main() {
  int x = 1;
  int y = 2;
  int z = myFunc(x,y);
}

test.asm

myFunc:
	movl	%edi, -4(%rbp) #grab x off stack
	movl	%esi, -8(%rbp) #grab y off stack
	add     %esi, %edi     #add x and y
	movl	%esi, %eax	   #return x + y
	ret

.globl main
main:
	movl	$1, -4(%rbp) #x = 1
	movl	$2, -8(%rbp) #y = 2

	call	myFunc
	ret