Thiago Macieira wrote:
However, the div and mul are much more interesting. Those ought to be the same, so I am actually wondering how it is possible that the div and mul on x86-64 can be so slow.
Divide by x and multiply by 1/x are not exactly the same because 1/x may not be exactly represented in the floating point format. So I think this is the reason the compiler is not producing the optimization. Though 1/256 can be represented exactly so it does not apply to this specific case.
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