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Fix i32 multiplication

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This commit is contained in:
Rerumu 2022-06-26 00:28:03 -04:00
parent f5bd86ccef
commit 43aba1185a
1 changed files with 18 additions and 1 deletions
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17
codegen/luau/runtime/runtime.lua
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@ -1,6 +1,7 @@
local module = {}
local MAX_SIGNED = 0x7fffffff
local BIT_SET_27 = 0x8000000
local BIT_SET_32 = 0x100000000
local to_u32 = bit32.band
@ -44,6 +45,10 @@ do
local assert = assert
local bit_and = bit32.band
local bit_lshift = bit32.lshift
local bit_rshift = bit32.rshift
local math_abs = math.abs
local math_floor = math.floor
local math_round = math.round
@ -67,7 +72,19 @@ do
sub.i64 = I64.subtract
function mul.i32(a, b)
if (a + b) < BIT_SET_27 then
return to_u32(a * b)
else
local a16 = bit_rshift(a, 16)
local a00 = bit_and(a, 0xFFFF)
local b16 = bit_rshift(b, 16)
local b00 = bit_and(b, 0xFFFF)
local c00 = a00 * b00
local c16 = a16 * b00 + a00 * b16
return to_u32(c00 + bit_lshift(c16, 16))
end
end
mul.i64 = I64.multiply