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David Burgess wrote:
> I presume the number2int that fails is the arithmetic version not
> the inline assembler. Or do both fail?

Right. Because adding the magic constant 2^52 + 2^51 cuts off
small integers when single-precision (24 bits) is selected.

The inline assembler variant would still work, but I guess it
was too problematic with different compilers.

And this doesn't solve other failures caused by DirectX messing
with the FPCW (signalling and denormals handling).

I guess even something trivial like:
  for i=1,1e9 do end
won't terminate due to the precision loss (I haven't tried