.text
.type fun, @function
.global fun

#a - rdi
#b - rsi
#pcs - rdx
#count - rcx
fun:
	PUSH %rbx
	XOR %rbx, %rbx
	XOR %r9, %r9
	XOR %r10, %r10
	XOR %rax, %rax
	MOV $1, %rbx # (i+1)
	MOV $0, %r9 # how Many 1
	CMP $1, %rsi # which bit
	JE sum
	CMP $2, %rsi
	JE mul
	JMP nothing
loop:
	PUSH %rdi
	AND $1, %rdi
	JMP count
afterCount:
	CMP $0, %rsi
	JE afterOp
	PUSH %rax
	MOV %rdi, %rax
	MUL %rbx
	MOV %rax, %r8
	POP %rax
	CMP $1, %rsi
	JE sumOp
	CMP $2, %rsi
	JE mulOp
afterOp:
	POP %rdi
	INC %rbx
	SHR $1, %rdi
	CMP $64, %rbx
	JNE loop
afterLoop:
	POP %rbx
	MOVL %r9d, (%rcx)
	MOVL %r10d, (%rdx)
	RET

sum:
	MOV $0, %rax #starting value
	JMP loop

mul:
	MOV $1, %rax #starting value
	JMP loop

nothing:
	MOV $0, %rax
	JMP loop

sumOp:
	ADD %r8, %rax #xi in rax
	JMP afterOp

mulOp:
	MUL %r8 #xi in rax
	JMP afterOp

count:
	CMP $0, %rdi
	JE afterCount
	INC %r9
	MOV %rbx, %r10
	JMP afterCount