GENERAL PURPOSE

64-bit	32-bit	16-bit	low 8-bit	high 8-bit	comment
rax	eax	ax	al	ah
rbx	ebx	bx	bl	bh
rcx	ecx	cx	cl	ch
rdx	edx	dx	dl	dh
rsi	esi	si	sil	-
rdi	edi	di	dil	-
rbp	ebp	bp	bpl	-	Base pointer
rsp	esp	sp	spl	-	Stack pointer
r8	r8d	r8w	r8b	-
r9	r9d	r9w	r9b	-
r10	r10d	r10w	r10b	-
r11	r11d	r11w	r11b	-
r12	r12d	r12w	r12b	-
r13	r13d	r13w	r13b	-
r14	r14d	r14w	r14b	-
r15	r15d	r15w	r15b	-