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Refactor some numeric operations

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This commit is contained in:
Rerumu 2022-05-17 22:16:10 -04:00
parent c7d640b17e
commit 81fbbd455f
1 changed files with 23 additions and 16 deletions
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39
codegen-luau/runtime/numeric.lua
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@ -3,7 +3,7 @@ local Numeric = {}
local BIT_SET_31 = 0x80000000
local BIT_SET_32 = 0x100000000
local K_ZERO, K_ONE, K_BIT_SET_24
local K_ZERO, K_ONE, K_BIT_SET_26
local bit_lshift = bit32.lshift
local bit_rshift = bit32.rshift
@ -14,6 +14,8 @@ 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
@ -111,9 +113,9 @@ function Numeric.multiply(lhs, rhs)
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_24) and num_is_less_unsigned(rhs, K_BIT_SET_24) then
local data_l_1 = into_u32(lhs)
local data_r_1 = into_u32(rhs)
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
@ -138,19 +140,22 @@ function Numeric.multiply(lhs, rhs)
local b16 = bit_rshift(data_r_1, 16)
local b00 = bit_and(data_r_1, 0xFFFF)
local c48, c32, c16, c00 = 0, 0, 0, 0
local c00 = a00 * b00
local c16 = bit_rshift(c00, 16)
c00 = c00 + a00 * b00
c16 = c16 + bit_rshift(c00, 16)
c00 = bit_and(c00, 0xFFFF)
c16 = c16 + a16 * b00
c32 = c32 + bit_rshift(c16, 16)
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
c48 = c48 + bit_rshift(c32, 16)
local c48 = bit_rshift(c32, 16)
c32 = bit_and(c32, 0xFFFF)
c32 = c32 + a16 * b16
c48 = c48 + bit_rshift(c32, 16)
@ -161,8 +166,8 @@ function Numeric.multiply(lhs, rhs)
c48 = c48 + a48 * b00 + a32 * b16 + a16 * b32 + a00 * b48
c48 = bit_and(c48, 0xFFFF)
local data_1 = bit_or(bit_lshift(c16, 16), c00)
local data_2 = bit_or(bit_lshift(c48, 16), c32)
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
@ -268,12 +273,14 @@ function Numeric.shift_left(lhs, rhs)
local data_2 = bit_or(bit_lshift(data_l_2, count), bit_rshift(data_l_1, 32 - count))
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_2 = into_u32(lhs)
local data_l_1, _ = into_u32(lhs)
local data_2 = bit_lshift(data_l_2, count - 32)
return from_u32(0, data_2)
return from_u32(0, bit_lshift(data_l_1, count - 32))
end
end
@ -396,7 +403,7 @@ num_is_greater_unsigned = Numeric.is_greater_unsigned
K_ZERO = from_u64(0)
K_ONE = from_u64(1)
K_BIT_SET_24 = from_u64(0x1000000)
K_BIT_SET_26 = from_u64(0x4000000)
Numeric.K_ZERO = K_ZERO
Numeric.K_ONE = K_ONE