Restructure and compartmentalize the project

This commit is contained in:
Rerumu
2022-06-23 20:14:04 -04:00
parent 59a5a3219f
commit 223895e617
34 changed files with 105 additions and 93 deletions
+411
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@@ -0,0 +1,411 @@
local Numeric = {}
local BIT_SET_31 = 0x80000000
local BIT_SET_32 = 0x100000000
local K_ZERO, K_ONE, K_BIT_SET_26
local bit_lshift = bit32.lshift
local bit_rshift = bit32.rshift
local bit_arshift = bit32.arshift
local bit_and = bit32.band
local bit_or = bit32.bor
local bit_xor = bit32.bxor
local bit_not = bit32.bnot
local bit_replace = bit32.replace
local math_ceil = math.ceil
local math_floor = math.floor
local math_log = math.log
local math_max = math.max
local math_pow = math.pow
local table_freeze = table.freeze
local from_u32, into_u32, from_u64, into_u64
local num_add, num_subtract, num_multiply, num_divide_unsigned, num_negate, num_bit_not
local num_is_negative, num_is_zero, num_is_equal, num_is_less_unsigned, num_is_greater_unsigned
-- TODO: Eventually support Vector3
function Numeric.from_u32(data_1, data_2)
return table_freeze({ data_1, data_2 })
end
function Numeric.into_u32(data)
return data[1], data[2]
end
function Numeric.from_u64(value)
return from_u32(bit_and(value), math_floor(value / BIT_SET_32))
end
function Numeric.into_u64(value)
local data_1, data_2 = into_u32(value)
return data_1 + data_2 * BIT_SET_32
end
function Numeric.add(lhs, rhs)
local data_l_1, data_l_2 = into_u32(lhs)
local data_r_1, data_r_2 = into_u32(rhs)
local data_1 = data_l_1 + data_r_1
local data_2 = data_l_2 + data_r_2
if data_1 >= BIT_SET_32 then
data_1 = data_1 - BIT_SET_32
data_2 = data_2 + 1
end
if data_2 >= BIT_SET_32 then
data_2 = data_2 - BIT_SET_32
end
return from_u32(data_1, data_2)
end
function Numeric.subtract(lhs, rhs)
local data_l_1, data_l_2 = into_u32(lhs)
local data_r_1, data_r_2 = into_u32(rhs)
local data_1 = data_l_1 - data_r_1
local data_2 = data_l_2 - data_r_2
if data_1 < 0 then
data_1 = data_1 + BIT_SET_32
data_2 = data_2 - 1
end
if data_2 < 0 then
data_2 = data_2 + BIT_SET_32
end
return from_u32(data_1, data_2)
end
local function set_absolute(lhs, rhs)
local has_negative = false
if num_is_negative(lhs) then
lhs = num_negate(lhs)
has_negative = not has_negative
end
if num_is_negative(rhs) then
rhs = num_negate(rhs)
has_negative = not has_negative
end
return has_negative, lhs, rhs
end
function Numeric.multiply(lhs, rhs)
if num_is_zero(lhs) or num_is_zero(rhs) then
return K_ZERO
end
local has_negative
has_negative, lhs, rhs = set_absolute(lhs, rhs)
-- If both longs are small, use float multiplication
if num_is_less_unsigned(lhs, K_BIT_SET_26) and num_is_less_unsigned(rhs, K_BIT_SET_26) then
local data_l_1, _ = into_u32(lhs)
local data_r_1, _ = into_u32(rhs)
local result = from_u64(data_l_1 * data_r_1)
if has_negative then
result = num_negate(result)
end
return result
end
-- Divide each long into 4 chunks of 16 bits, and then add up 4x4 products.
-- We can skip products that would overflow.
local data_l_1, data_l_2 = into_u32(lhs)
local data_r_1, data_r_2 = into_u32(rhs)
local a48 = bit_rshift(data_l_2, 16)
local a32 = bit_and(data_l_2, 0xFFFF)
local a16 = bit_rshift(data_l_1, 16)
local a00 = bit_and(data_l_1, 0xFFFF)
local b48 = bit_rshift(data_r_2, 16)
local b32 = bit_and(data_r_2, 0xFFFF)
local b16 = bit_rshift(data_r_1, 16)
local b00 = bit_and(data_r_1, 0xFFFF)
local c00 = a00 * b00
local c16 = bit_rshift(c00, 16)
c00 = bit_and(c00, 0xFFFF)
c16 = c16 + a16 * b00
local c32 = bit_rshift(c16, 16)
c16 = bit_and(c16, 0xFFFF)
c16 = c16 + a00 * b16
c32 = c32 + bit_rshift(c16, 16)
c16 = bit_and(c16, 0xFFFF)
c32 = c32 + a32 * b00
local c48 = bit_rshift(c32, 16)
c32 = bit_and(c32, 0xFFFF)
c32 = c32 + a16 * b16
c48 = c48 + bit_rshift(c32, 16)
c32 = bit_and(c32, 0xFFFF)
c32 = c32 + a00 * b32
c48 = c48 + bit_rshift(c32, 16)
c32 = bit_and(c32, 0xFFFF)
c48 = c48 + a48 * b00 + a32 * b16 + a16 * b32 + a00 * b48
c48 = bit_and(c48, 0xFFFF)
local data_1 = bit_replace(c00, c16, 16, 16)
local data_2 = bit_replace(c32, c48, 16, 16)
local result = from_u32(data_1, data_2)
if has_negative then
result = num_negate(result)
end
return result
end
local function get_approx_delta(rem, rhs)
local approx = math_max(1, math_floor(rem / rhs))
local log = math_ceil(math_log(approx, 2))
local delta = log <= 48 and 1 or math_pow(2, log - 48)
return approx, delta
end
function Numeric.divide_unsigned(lhs, rhs)
if num_is_zero(rhs) then
error("division by zero")
elseif num_is_zero(lhs) then
return 0
end
local rhs_number = into_u64(rhs)
local rem = lhs
local res = K_ZERO
while num_is_greater_unsigned(rem, rhs) or num_is_equal(rem, rhs) do
local res_approx, delta = get_approx_delta(into_u64(rem), rhs_number)
local res_temp = from_u64(res_approx)
local rem_temp = num_multiply(res_temp, rhs)
while num_is_negative(rem_temp) or num_is_greater_unsigned(rem_temp, rem) do
res_approx = res_approx - delta
res_temp = from_u64(res_approx)
rem_temp = num_multiply(res_temp, rhs)
end
if num_is_zero(res_temp) then
res_temp = K_ONE
end
res = num_add(res, res_temp)
rem = num_subtract(rem, rem_temp)
end
return res
end
function Numeric.divide_signed(lhs, rhs)
local has_negative
has_negative, lhs, rhs = set_absolute(lhs, rhs)
local result = num_divide_unsigned(lhs, rhs)
if has_negative then
result = num_negate(result)
end
return result
end
function Numeric.negate(value)
return num_add(num_bit_not(value), K_ONE)
end
function Numeric.bit_and(lhs, rhs)
local data_l_1, data_l_2 = into_u32(lhs)
local data_r_1, data_r_2 = into_u32(rhs)
return from_u32(bit_and(data_l_1, data_r_1), bit_and(data_l_2, data_r_2))
end
function Numeric.bit_not(value)
local data_1, data_2 = into_u32(value)
return from_u32(bit_not(data_1), bit_not(data_2))
end
function Numeric.bit_or(lhs, rhs)
local data_l_1, data_l_2 = into_u32(lhs)
local data_r_1, data_r_2 = into_u32(rhs)
return from_u32(bit_or(data_l_1, data_r_1), bit_or(data_l_2, data_r_2))
end
function Numeric.bit_xor(lhs, rhs)
local data_l_1, data_l_2 = into_u32(lhs)
local data_r_1, data_r_2 = into_u32(rhs)
return from_u32(bit_xor(data_l_1, data_r_1), bit_xor(data_l_2, data_r_2))
end
function Numeric.shift_left(lhs, rhs)
local count = into_u64(rhs)
if count < 32 then
local pad = 32 - count
local data_l_1, data_l_2 = into_u32(lhs)
local data_1 = bit_lshift(data_l_1, count)
local data_2 = bit_replace(bit_rshift(data_l_1, pad), data_l_2, count, pad)
return from_u32(data_1, data_2)
elseif count == 32 then
local data_l_1, _ = into_u32(lhs)
return from_u32(0, data_l_1)
else
local data_l_1, _ = into_u32(lhs)
return from_u32(0, bit_lshift(data_l_1, count - 32))
end
end
function Numeric.shift_right_unsigned(lhs, rhs)
local count = into_u64(rhs)
if count < 32 then
local data_l_1, data_l_2 = into_u32(lhs)
local data_1 = bit_replace(bit_rshift(data_l_1, count), data_l_2, 32 - count, count)
local data_2 = bit_rshift(data_l_2, count)
return from_u32(data_1, data_2)
elseif count == 32 then
local _, data_l_2 = into_u32(lhs)
return from_u32(data_l_2, 0)
else
local _, data_l_2 = into_u32(lhs)
return from_u32(bit_rshift(data_l_2, count - 32), 0)
end
end
function Numeric.shift_right_signed(lhs, rhs)
local count = into_u64(rhs)
if count < 32 then
local data_l_1, data_l_2 = into_u32(lhs)
local data_1 = bit_replace(bit_rshift(data_l_1, count), data_l_2, 32 - count, count)
local data_2 = bit_arshift(data_l_2, count)
return from_u32(data_1, data_2)
else
local _, data_l_2 = into_u32(lhs)
local data_1 = bit_arshift(data_l_2, count - 32)
local data_2 = data_l_2 > BIT_SET_31 and BIT_SET_32 - 1 or 0
return from_u32(data_1, data_2)
end
end
function Numeric.is_negative(value)
local _, data_2 = into_u32(value)
return data_2 > BIT_SET_31
end
function Numeric.is_zero(value)
local data_1, data_2 = into_u32(value)
return data_1 == 0 and data_2 == 0
end
function Numeric.is_equal(lhs, rhs)
local data_l_1, data_l_2 = into_u32(lhs)
local data_r_1, data_r_2 = into_u32(rhs)
return data_l_1 == data_r_1 and data_l_2 == data_r_2
end
function Numeric.is_less_unsigned(lhs, rhs)
local data_l_1, data_l_2 = into_u32(lhs)
local data_r_1, data_r_2 = into_u32(rhs)
return data_l_2 < data_r_2 or (data_l_2 == data_r_2 and data_l_1 < data_r_1)
end
function Numeric.is_greater_unsigned(lhs, rhs)
local data_l_1, data_l_2 = into_u32(lhs)
local data_r_1, data_r_2 = into_u32(rhs)
return data_l_2 > data_r_2 or (data_l_2 == data_r_2 and data_l_1 > data_r_1)
end
function Numeric.is_less_signed(lhs, rhs)
local neg_a = num_is_negative(lhs)
local neg_b = num_is_negative(rhs)
if neg_a and not neg_b then
return true
elseif not neg_a and neg_b then
return false
else
return num_is_negative(num_subtract(lhs, rhs))
end
end
function Numeric.is_greater_signed(lhs, rhs)
local neg_a = num_is_negative(lhs)
local neg_b = num_is_negative(rhs)
if neg_a and not neg_b then
return false
elseif not neg_a and neg_b then
return true
else
return num_is_negative(num_subtract(rhs, lhs))
end
end
from_u32 = Numeric.from_u32
into_u32 = Numeric.into_u32
from_u64 = Numeric.from_u64
into_u64 = Numeric.into_u64
num_add = Numeric.add
num_subtract = Numeric.subtract
num_multiply = Numeric.multiply
num_divide_unsigned = Numeric.divide_unsigned
num_negate = Numeric.negate
num_bit_not = Numeric.bit_not
num_is_negative = Numeric.is_negative
num_is_zero = Numeric.is_zero
num_is_equal = Numeric.is_equal
num_is_less_unsigned = Numeric.is_less_unsigned
num_is_greater_unsigned = Numeric.is_greater_unsigned
K_ZERO = from_u64(0)
K_ONE = from_u64(1)
K_BIT_SET_26 = from_u64(0x4000000)
Numeric.K_ZERO = K_ZERO
Numeric.K_ONE = K_ONE
return table_freeze(Numeric)
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local module = {}
local MAX_SIGNED = 0x7fffffff
local BIT_SET_32 = 0x100000000
local to_u32 = bit32.band
local num_from_u32 = I64.from_u32
local num_into_u32 = I64.into_u32
local function to_i32(num)
if num > MAX_SIGNED then
num = num - BIT_SET_32
end
return num
end
local function no_op(num)
return num
end
do
local temp = {}
temp.K_ZERO = I64.K_ZERO
temp.K_ONE = I64.K_ONE
temp.from_u32 = num_from_u32
module.i64 = temp
end
do
local add = {}
local sub = {}
local mul = {}
local div = {}
local neg = {}
local min = {}
local max = {}
local copysign = {}
local nearest = {}
local assert = assert
local math_abs = math.abs
local math_round = math.round
local math_floor = math.floor
local math_sign = math.sign
local math_min = math.min
local math_max = math.max
function add.i32(a, b)
return to_u32(a + b)
end
add.i64 = I64.add
function sub.i32(a, b)
return to_u32(a - b)
end
sub.i64 = I64.subtract
function mul.i32(a, b)
return to_u32(a * b)
end
mul.i64 = I64.multiply
function div.i32(lhs, rhs)
assert(rhs ~= 0, "division by zero")
lhs = to_i32(lhs)
rhs = to_i32(rhs)
return to_u32(lhs / rhs)
end
div.i64 = I64.divide_signed
function div.u32(lhs, rhs)
assert(rhs ~= 0, "division by zero")
return to_u32(lhs / rhs)
end
div.u64 = I64.divide_unsigned
function neg.num(num)
return -num
end
function min.num(a, b)
if b ~= b then
return b
end
return math_min(a, b)
end
function max.num(a, b)
if b ~= b then
return b
end
return math_max(a, b)
end
function copysign.num(lhs, rhs)
if rhs >= 0 then
return (math_abs(lhs))
else
return -math_abs(lhs)
end
end
function nearest.num(num)
local result = math_round(num)
if math_abs(num) % 1 == 0.5 and math_floor(math_abs(num) % 2) == 0 then
result -= math_sign(result)
end
return result
end
module.add = add
module.sub = sub
module.mul = mul
module.div = div
module.neg = neg
module.min = min
module.max = max
module.copysign = copysign
module.nearest = nearest
end
do
local clz = {}
local ctz = {}
local popcnt = {}
local bit_and = bit32.band
clz.i32 = bit32.countlz
ctz.i32 = bit32.countrz
function popcnt.i32(num)
local count = 0
while num ~= 0 do
num = bit_and(num, num - 1)
count = count + 1
end
return count
end
module.clz = clz
module.ctz = ctz
module.popcnt = popcnt
end
do
local eq = {}
local ne = {}
local le = {}
local lt = {}
local ge = {}
local gt = {}
local num_is_equal = I64.is_equal
local num_is_greater_signed = I64.is_greater_signed
local num_is_greater_unsigned = I64.is_greater_unsigned
local num_is_less_signed = I64.is_less_signed
local num_is_less_unsigned = I64.is_less_unsigned
eq.i64 = num_is_equal
function ne.i64(lhs, rhs)
return not num_is_equal(lhs, rhs)
end
function ge.i32(lhs, rhs)
return to_i32(lhs) >= to_i32(rhs)
end
function ge.i64(lhs, rhs)
return num_is_greater_signed(lhs, rhs) or num_is_equal(lhs, rhs)
end
function ge.u64(lhs, rhs)
return num_is_greater_unsigned(lhs, rhs) or num_is_equal(lhs, rhs)
end
function gt.i32(lhs, rhs)
return to_i32(lhs) > to_i32(rhs)
end
gt.i64 = num_is_greater_signed
gt.u64 = num_is_greater_unsigned
function le.i32(lhs, rhs)
return to_i32(lhs) <= to_i32(rhs)
end
function le.i64(lhs, rhs)
return num_is_less_signed(lhs, rhs) or num_is_equal(lhs, rhs)
end
function le.u64(lhs, rhs)
return num_is_less_unsigned(lhs, rhs) or num_is_equal(lhs, rhs)
end
function lt.i32(lhs, rhs)
return to_i32(lhs) < to_i32(rhs)
end
lt.i64 = num_is_less_signed
lt.u64 = num_is_less_unsigned
module.eq = eq
module.ne = ne
module.le = le
module.lt = lt
module.ge = ge
module.gt = gt
end
do
local band = {}
local bor = {}
local bxor = {}
local bnot = {}
band.i64 = I64.bit_and
bnot.i32 = bit32.bnot
bnot.i64 = I64.bit_not
bor.i64 = I64.bit_or
bxor.i64 = I64.bit_xor
module.band = band
module.bor = bor
module.bxor = bxor
module.bnot = bnot
end
do
local shl = {}
local shr = {}
local rotl = {}
local rotr = {}
rotl.i32 = bit32.lrotate
rotl.i64 = bit32.lrotate
rotr.i32 = bit32.rrotate
rotr.i64 = bit32.rrotate
shl.i32 = bit32.lshift
shl.i64 = bit32.lshift
shl.u32 = bit32.lshift
shl.u64 = bit32.lshift
shr.i32 = bit32.arshift
shr.i64 = bit32.arshift
shr.u32 = bit32.rshift
shr.u64 = bit32.rshift
module.shl = shl
module.shr = shr
module.rotl = rotl
module.rotr = rotr
end
do
local wrap = {}
local trunc = {}
local extend = {}
local convert = {}
local demote = {}
local promote = {}
local reinterpret = {}
local math_ceil = math.ceil
local math_floor = math.floor
local string_pack = string.pack
local string_unpack = string.unpack
local num_from_u64 = I64.from_u64
local num_into_u64 = I64.into_u64
local num_negate = I64.negate
local num_is_negative = I64.is_negative
function wrap.i32_i64(num)
local data_1, _ = num_into_u32(num)
return data_1
end
trunc.i32_f32 = to_u32
trunc.i32_f64 = to_u32
trunc.u32_f32 = no_op
trunc.u32_f64 = no_op
function trunc.i64_f32(num)
if num < 0 then
local temp = num_from_u64(-math_ceil(num))
return num_negate(temp)
else
local temp = math_floor(num)
return num_from_u64(temp)
end
end
function trunc.i64_f64(num)
if num < 0 then
local temp = num_from_u64(-math_ceil(num))
return num_negate(temp)
else
local temp = math_floor(num)
return num_from_u64(temp)
end
end
function trunc.num(num)
return if num >= 0 then math.floor(num) else math.ceil(num)
end
trunc.u64_f32 = num_from_u64
trunc.u64_f64 = num_from_u64
function extend.i64_i32(num)
if num > MAX_SIGNED then
local temp = num_from_u32(-num + BIT_SET_32, 0)
return num_negate(temp)
else
return num_from_u32(num, 0)
end
end
function extend.u64_i32(num)
return num_from_u32(num, 0)
end
convert.f32_i32 = no_op
convert.f32_u32 = no_op
function convert.f32_i64(num)
if num_is_negative(num) then
local temp = num_negate(num)
return -num_into_u64(temp)
else
return num_into_u64(num)
end
end
convert.f32_u64 = num_into_u64
convert.f64_i32 = to_i32
convert.f64_u32 = no_op
function convert.f64_i64(num)
if num_is_negative(num) then
local temp = num_negate(num)
return -num_into_u64(temp)
else
return num_into_u64(num)
end
end
convert.f64_u64 = num_into_u64
demote.f32_f64 = no_op
promote.f64_f32 = no_op
function reinterpret.i32_f32(num)
local packed = string_pack("f", num)
return string_unpack("<I4", packed)
end
function reinterpret.i64_f64(num)
local packed = string_pack("d", num)
local data_1, data_2 = string_unpack("<I4I4", packed)
return num_from_u32(data_1, data_2)
end
function reinterpret.f32_i32(num)
local packed = string_pack("<I4", num)
return string_unpack("f", packed)
end
function reinterpret.f64_i64(num)
local data_1, data_2 = num_into_u32(num)
local packed = string_pack("<I4I4", data_1, data_2)
return string_unpack("d", packed)
end
module.wrap = wrap
module.trunc = trunc
module.extend = extend
module.convert = convert
module.demote = demote
module.promote = promote
module.reinterpret = reinterpret
end
do
local load = {}
local store = {}
local allocator = {}
local bit_extract = bit32.extract
local bit_replace = bit32.replace
local bit_bor = bit32.bor
local bit_band = bit32.band
local bit_lshift = bit32.lshift
local bit_rshift = bit32.rshift
local math_floor = math.floor
local string_byte = string.byte
local string_unpack = string.unpack
local reinterpret_f32_i32 = module.reinterpret.f32_i32
local reinterpret_f64_i64 = module.reinterpret.f64_i64
local reinterpret_i32_f32 = module.reinterpret.i32_f32
local reinterpret_i64_f64 = module.reinterpret.i64_f64
local function load_byte(data, addr)
local value = data[math_floor(addr / 4)] or 0
return bit_extract(value, addr % 4 * 8, 8)
end
local function store_byte(data, addr, value)
local adjust = math_floor(addr / 4)
data[adjust] = bit_replace(data[adjust] or 0, value, addr % 4 * 8, 8)
end
function load.i32_i8(memory, addr)
local b = load_byte(memory.data, addr)
if b >= 0x80 then
return to_u32(b - 0x100)
else
return b
end
end
function load.i32_u8(memory, addr)
return load_byte(memory.data, addr)
end
function load.i32_i16(memory, addr)
local data = memory.data
local num
if addr % 4 == 0 then
num = bit_band(data[addr / 4] or 0, 0xFFFF)
else
local b1 = load_byte(data, addr)
local b2 = bit_lshift(load_byte(data, addr + 1), 8)
num = bit_bor(b1, b2)
end
if num >= 0x8000 then
return to_u32(num - 0x10000)
else
return num
end
end
function load.i32(memory, addr)
local data = memory.data
if addr % 4 == 0 then
-- aligned read
return data[addr / 4] or 0
else
-- unaligned read
local b1 = load_byte(data, addr)
local b2 = bit_lshift(load_byte(data, addr + 1), 8)
local b3 = bit_lshift(load_byte(data, addr + 2), 16)
local b4 = bit_lshift(load_byte(data, addr + 3), 24)
return bit_bor(b1, b2, b3, b4)
end
end
local load_i32 = load.i32
function load.i64(memory, addr)
local data_1 = load_i32(memory, addr)
local data_2 = load_i32(memory, addr + 4)
return num_from_u32(data_1, data_2)
end
local load_i64 = load.i64
function load.f32(memory, addr)
local raw = load_i32(memory, addr)
return reinterpret_f32_i32(raw)
end
function load.f64(memory, addr)
local raw = load_i64(memory, addr)
return reinterpret_f64_i64(raw)
end
function store.i32_n8(memory, addr, value)
store_byte(memory.data, addr, value)
end
local store_i8 = store.i32_n8
function store.i32_n16(memory, addr, value)
store_byte(memory.data, addr, value)
store_byte(memory.data, addr + 1, bit_rshift(value, 8))
end
function store.i32(memory, addr, value)
local data = memory.data
if addr % 4 == 0 then
-- aligned write
data[addr / 4] = value
else
-- unaligned write
store_byte(data, addr, value)
store_byte(data, addr + 1, bit_rshift(value, 8))
store_byte(data, addr + 2, bit_rshift(value, 16))
store_byte(data, addr + 3, bit_rshift(value, 24))
end
end
local store_i32 = store.i32
local store_i32_n8 = store.i32_n8
local store_i32_n16 = store.i32_n16
function store.i64_n8(memory, addr, value)
local data_1, _ = num_into_u32(value)
store_i32_n8(memory, addr, data_1)
end
function store.i64_n16(memory, addr, value)
local data_1, _ = num_into_u32(value)
store_i32_n16(memory, addr, data_1)
end
function store.i64_n32(memory, addr, value)
local data_1, _ = num_into_u32(value)
store_i32(memory, addr, data_1)
end
function store.i64(memory, addr, value)
local data_1, data_2 = num_into_u32(value)
store_i32(memory, addr, data_1)
store_i32(memory, addr + 4, data_2)
end
local store_i64 = store.i64
function store.f32(memory, addr, value)
store_i32(memory, addr, reinterpret_i32_f32(value))
end
function store.f64(memory, addr, value)
store_i64(memory, addr, reinterpret_i64_f64(value))
end
function store.string(memory, offset, data, len)
len = len or #data
local rem = len % 4
for i = 1, len - rem, 4 do
local v = string_unpack("<I4", data, i)
store_i32(memory, offset + i - 1, v)
end
for i = len - rem + 1, len do
local v = string_byte(data, i)
store_i8(memory, offset + i - 1, v)
end
end
function allocator.new(min, max)
return { min = min, max = max, data = {} }
end
function allocator.grow(memory, num)
local old = memory.min
local new = old + num
if new > memory.max then
return -1
else
memory.min = new
return old
end
end
module.load = load
module.store = store
module.allocator = allocator
end
return module