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Improve bit32 polyfill

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Guldoman 2022-01-12 00:07:14 +01:00
parent 31d448971a
commit 7eb9908f1a
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1 changed files with 12 additions and 11 deletions
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21
data/core/bit.lua
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@ -12,19 +12,20 @@ local function mask(n)
end end
function bit.extract(n, field, width) function bit.extract(n, field, width)
local r = trim(field) local w = width or 1
local f = width assert(w > 0, "width must be positive")
r = (r >> f) & mask(width) assert(field + w < LUA_NBITS and field + w >= 0, "trying to access non-existent bits")
return r local m = trim(n)
return m >> field & mask(w)
end end
function bit.replace(n, v, field, width) function bit.replace(n, v, field, width)
local r = trim(v); local w = width or 1
local v = trim(field); assert(w > 0, "width must be positive")
local f = width assert(field + w < LUA_NBITS and field + w >= 0, "trying to access non-existent bits")
local m = mask(width); local m = trim(n)
r = (r & ~(m << f)) | ((v & m) << f); local x = v & mask(width);
return r return m & ~(mask(w) << field) | (x << field)
end end
return bit return bit