code002lover/Wasynth
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Extend LuaJIT bit operations

Browse Source
This commit is contained in:
Rerumu 2021-11-22 17:12:20 -05:00
parent 8f7007cfc6
commit 2160ad2130
1 changed files with 27 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
runtime/luajit.lua
View File

@ -37,30 +37,35 @@ do
module.ctz = ctz
module.popcnt = popcnt
function clz.i32(x)
local n = 0
function clz.i32(num)
for i = 0, 31 do
local mask = bit.lshift(1, 31 - i)
x = u32(x)
if bit.band(num, mask) ~= 0 then return i end
end
if x <= 0x0000ffff then
n = n + 16
x = bit.lshift(x, 16)
return 32
end
if x <= 0x00ffffff then
n = n + 8
x = bit.lshift(x, 8)
end
if x <= 0x0fffffff then
n = n + 4
x = bit.lshift(x, 4)
end
if x <= 0x3fffffff then
n = n + 2
x = bit.lshift(x, 2)
end
if x <= 0x7fffffff then n = n + 1 end
return n
function ctz.i32(num)
for i = 0, 31 do
local mask = bit.lshift(1, i)
if bit.band(num, mask) ~= 0 then return i end
end
return 32
end
function popcnt.i32(num)
local count = 0
while num ~= 0 do
num = bit.band(num, num - 1)
count = count + 1
end
return count
end
end
@ -193,6 +198,7 @@ do
function load.i64(memory, addr) return ffi.cast(ptr_i64, memory.data + addr)[0] end
function store.i32_n8(memory, addr, value) memory.data[addr] = value end
function store.i32(memory, addr, value) ffi.cast(ptr_i32, memory.data + addr)[0] = value end
function store.i64_n32(memory, addr, value) ffi.cast(ptr_i32, memory.data + addr)[0] = value end
function store.i64(memory, addr, value) ffi.cast(ptr_i64, memory.data + addr)[0] = value end
end