how do do unsigned int multiply without it rounding on ARM processors? I have encountered a very tricky issue, that I AM SURE has bitten many a person in the ass, and that is assuming that you can multiply two 32-bit unsigned numbers, and get the 32 bit quotient, (the 32 least significant bits) without any rounding going on. It works fine on Intel chips, because A*B is converted to a floating multiply by the Ecmascript spec (why did they do this one wonders!), and since on intel chips you have 80 bits of precision, there is no problem with the conversion to and from 80 bit floating point. But when you try running your code on android, you get a rounding error, and if like me you are trying to do a hashing function that depends on perfect arithmetic, you are screwed!Unfortunately, on ARM tablets such as Trasnformer Prime, and others, there is a loss of precision. This is deadly for hashing algorithms, random number generators, any other function that is expecting full 32 bit x 32 bit = 32 bit result with higher order bits ignored. var a
AdChoices