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> , as many other embedded cpu do not suport sse instructions

This is true, but they do not support x87 instructions too. (like all
ARM cpus and MIPS cpus who does not have hardware floating-point
support at all)

I'd say 99% embedded cpus support sse or have no hardware
floating-point support at all.

The fact is we could use integer as lua number and avoid
floating-point operations, I don't know if LuaJit works under this
condition without sse, but I think this is a definitely useful
feature: support non-sse CPU when lua number is integer.