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Do we need StrictMath and if so what is the cost?

See original GitHub issue

I believe out of the box Math allows for things like SSE optimizations etc. which can create slight differences versus using StrictMath. I’m not exactly sure what the amount of difference is and the cost of using one over another.

Any ideas?

Issue Analytics

State:
Created 7 years ago
Comments:5 (5 by maintainers)

Top GitHub Comments

1reaction

MLanghofcommented, Nov 3, 2016

I do believe we are one of the cases where bit-for-bit equivalence of results of floating point operations are required.

Worst case, somebody trains a bot with the Genetics that, for whatever reason, depends on a certain operation returning one particular float NaN (yes, there are millions of floats that represent NaN). Without StrictMath (to my knowledge at least), different implementations/JVMs are all required to return NaN, but their binary representations may differ. I’m not sure if Math allows leeway in the sign of zero, but that would be another thing.

So yes, I think we need StrictMath.

0reactions

MLanghofcommented, Nov 7, 2016

Implemented by #145.

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