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They don't really, they tried to glue IEEE semantics onto their complex numbers, so they're largely broken in the modern era of auto-vectorizing compilers.
by gct 8y ago
They don't really, they tried to glue IEEE semantics onto their complex numbers, so they're largely broken in the modern era of auto-vectorizing compilers.
- s-macke 8y agoInteresting. Under what circumstances are they broken?. Inf, NaN?
- gct 8y agoHere's an article on it that was posted awhile back: https://medium.com/@smcallis_71148/complex-arithmetic-is-complicated-873ec0c69fc5 https://medium.com/@smcallis_71148/complex-arithmetic-is-com... The gist is that you can get Nan+jNan for some operations where you wanted "infinity", so to do things their way, you have to insert a NaN check after multiplication for example. This isn't too bad by itself (it's just a bit mask), but it completely borks the vectorizer.