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This commit is contained in:
Rerumu 2022-06-30 17:49:37 -04:00
parent e5fb05b706
commit a0596f45e3
1 changed files with 131 additions and 32 deletions
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171
codegen/luajit/runtime/runtime.lua
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@ -172,38 +172,83 @@ do
local ctz = {}
local popcnt = {}
local lj_band = bit.band
local lj_lshift = bit.lshift
local bit_and = bit.band
local bit_lshift = bit.lshift
local bit_rshift = bit.rshift
function clz.i32(num)
for i = 0, 31 do
local mask = lj_lshift(1, 31 - i)
if lj_band(num, mask) ~= 0 then
return i
end
end
if num == 0 then
return 32
end
local count = 0
if bit_rshift(num, 16) == 0 then
num = bit_lshift(num, 16)
count = count + 16
end
if bit_rshift(num, 24) == 0 then
num = bit_lshift(num, 8)
count = count + 8
end
if bit_rshift(num, 28) == 0 then
num = bit_lshift(num, 4)
count = count + 4
end
if bit_rshift(num, 30) == 0 then
num = bit_lshift(num, 2)
count = count + 2
end
if bit_rshift(num, 31) == 0 then
count = count + 1
end
return count
end
function ctz.i32(num)
for i = 0, 31 do
local mask = lj_lshift(1, i)
if lj_band(num, mask) ~= 0 then
return i
end
end
if num == 0 then
return 32
end
local count = 0
if bit_lshift(num, 16) == 0 then
num = bit_rshift(num, 16)
count = count + 16
end
if bit_lshift(num, 24) == 0 then
num = bit_rshift(num, 8)
count = count + 8
end
if bit_lshift(num, 28) == 0 then
num = bit_rshift(num, 4)
count = count + 4
end
if bit_lshift(num, 30) == 0 then
num = bit_rshift(num, 2)
count = count + 2
end
if bit_lshift(num, 31) == 0 then
count = count + 1
end
return count
end
function popcnt.i32(num)
local count = 0
while num ~= 0 do
num = lj_band(num, num - 1)
num = bit_and(num, num - 1)
count = count + 1
end
@ -211,34 +256,88 @@ do
end
function clz.i64(num)
for i = 0, 63 do
local mask = lj_lshift(ID_ONE, 63 - i)
if lj_band(num, mask) ~= ID_ZERO then
return i * ID_ONE
end
end
if num == 0 then
return 64 * ID_ONE
end
local count = ID_ZERO
if bit_rshift(num, 32) == ID_ZERO then
num = bit_lshift(num, 32)
count = count + 32
end
if bit_rshift(num, 48) == ID_ZERO then
num = bit_lshift(num, 16)
count = count + 16
end
if bit_rshift(num, 56) == ID_ZERO then
num = bit_lshift(num, 8)
count = count + 8
end
if bit_rshift(num, 60) == ID_ZERO then
num = bit_lshift(num, 4)
count = count + 4
end
if bit_rshift(num, 62) == ID_ZERO then
num = bit_lshift(num, 2)
count = count + 2
end
if bit_rshift(num, 63) == ID_ZERO then
count = count + ID_ONE
end
return count
end
function ctz.i64(num)
for i = 0, 63 do
local mask = lj_lshift(ID_ONE, i)
if lj_band(num, mask) ~= ID_ZERO then
return i * ID_ONE
end
end
if num == 0 then
return 64 * ID_ONE
end
local count = ID_ZERO
if bit_lshift(num, 32) == ID_ZERO then
num = bit_rshift(num, 32)
count = count + 32
end
if bit_lshift(num, 48) == ID_ZERO then
num = bit_rshift(num, 16)
count = count + 16
end
if bit_lshift(num, 56) == ID_ZERO then
num = bit_rshift(num, 8)
count = count + 8
end
if bit_lshift(num, 60) == ID_ZERO then
num = bit_rshift(num, 4)
count = count + 4
end
if bit_lshift(num, 62) == ID_ZERO then
num = bit_rshift(num, 2)
count = count + 2
end
if bit_lshift(num, 63) == ID_ZERO then
count = count + ID_ONE
end
return count
end
function popcnt.i64(num)
local count = ID_ZERO
while num ~= ID_ZERO do
num = lj_band(num, num - 1)
num = bit_and(num, num - ID_ONE)
count = count + ID_ONE
end