local REGS = {
	al = {bits = 8, mask = 0x1},
	ah = {bits = 8, mask = 0x2},
	ax = {bits = 16, mask = 0x3},
	eax = {bits = 32, mask = 0x3},
	
	bl = {bits = 8, mask = 0x4},
	bh = {bits = 8, mask = 0x8},
	bx = {bits = 16, mask = 0xC},
	ebx = {bits = 32, mask = 0xC},
	
	cl = {bits = 8, mask = 0x10},
	ch = {bits = 8, mask = 0x20},
	cx = {bits = 16, mask = 0x30},
	ecx = {bits = 32, mask = 0x30},
	
	dl = {bits = 8, mask = 0x40},
	dh = {bits = 8, mask = 0x80},
	dx = {bits = 16, mask = 0xC0},
	edx = {bits = 32, mask = 0xC0},
	
	di = {bits = 16, mask = 0x100},
	edi = {bits = 32, mask = 0x100},
	
	si = {bits = 16, mask = 0x200},
	esi = {bits = 32, mask = 0x200},
	
	bp = {bits = 16, mask = 0x400},
	ebp = {bits = 32, mask = 0x400},
	
	sp = {bits = 16, mask = 0x800},
	esp = {bits = 32, mask = 0x800},
	
	ds = {bits = 16, mask = 0x100},
	es = {bits = 16, mask = 0x2000},
	fs = {bits = 16, mask = 0x4000},
	gs = {bits = 16, mask = 0x8000},
}

local REG_CLASSES = {
	reg8 = {
		items = {"al", "ah", "bl", "bh", "cl", "ch", "dl", "dh"}
	},
	regn8 = {
		items = {"eax", "ebx", "ecx", "edx", "ax", "bx", "cx", "dx", "di", "si", "bp", "edi", "esi", "ebp"}
	},
	seg = {
		items = {"ds", "es", "fs", "gs"}
	},
	rmptr = {
		items = {"bx", "bp", "di", "si"}
	}
}

for _, reg_class in pairs(REG_CLASSES) do
	local mask = 0
	for _, reg in ipairs(reg_class.items) do
		mask = mask | REGS[reg].mask
	end
	reg_class.mask = mask
end

return {
	GPR_SIZE = 32,
	REGS = REGS,
	REG_CLASSES = REG_CLASSES,
}