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Keep LuaJIT off the native-operator path #14

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Merged
derek-miller merged 1 commit into from
Aug 8, 2026
Merged

Keep LuaJIT off the native-operator path #14

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10 changes: 9 additions & 1 deletion src/bitn/_compat.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -33,10 +33,18 @@ local MASK32 = 0xFFFFFFFF
-- Implementation 1: Native operators (Lua 5.3+)
--------------------------------------------------------------------------------

-- Parsing `a & b` does not mean the result has 64-bit integer semantics. LuaJIT
-- rolling releases from 2026 accept the syntax and return a signed 32-bit number,
-- as from its `bit` library, while this branch assumes 5.3+ integers and skips the
-- to_unsigned() normalisation such a host needs.
--
-- So test the value, not the runtime: 5.3+ answers 0xFFFFFFFF and anything with
-- 32-bit semantics answers -1. Asking the question this way needs no list of which
-- runtimes exist, so it stays correct for whatever grows the syntax next.
local ok, result = pcall(load, "return function(a,b) return a & b end")
if ok and result then
local fn = result()
if fn then
if fn and fn(0xFFFFFFFF, 0xFFFFFFFF) == 0xFFFFFFFF then
-- Native operators available - define all functions using them
local native_band = fn
local native_bor = assert(load("return function(a,b) return a | b end"))()
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