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Mike Pall wrote:
Lua is not at fault here. The Borland/Delphi runtime modifies the
FPU control word and enables FP exceptions. This violates the
Windows ABI and causes plenty of interoperability problems:

Though formally it's not Lua's fault, in practice it leads to problems.
Are the benefits of using those 2 assembly instructions (yet another
piece of non ANSI C) big enough to justify fighting with compatibility

Is there a benchmark showing noticeable gain in performance of this piece versus the other ("non-Microsoft") variant of lua_number2integer, or maybe this was introduced to avoid issues with DirectX?