/* assembly file for function add3, which adds 3 args on stack
   written directly by Lin Jensen
   to assemble:
   gcc -c add3.s
   the object file is named add3.o
   see also: add3c.s, which is compiled from add3c.c 
   	add3p.s, which also calls printf from assembler 
	add3n.asm -- intel assembler, assembled with nasm
   MARCH 22 2012, b squard - 4ac	
*/
	.global add3
add3:
	movl 4(%esp),%eax	# a  - fetch and add args from stack
	movl 8(%esp),%edx	# b
	imul %edx, %edx		# b squared
	imull 12(%esp),%eax	# a*c
	imull $4, %eax
	sub	%eax, %edx	# edx = b2 - 4ac
	mov	%edx, %eax
	ret			# return with sum in eax