> Generally speaking, there are two reasons why people may *not* want an > FMA operation. > 1. They need their results to be reproducible across > compilers/platforms. (the most common reason) > The reproducibility of floating point calculation is very hard to reach a good survey of the problem is https://randomascii.wordpress.com/2013/07/16/floating-point-determinism/ it mention the fma problem but it only a part of a biggest picture
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