Missing host device (#29547)
Summary:
Missing `__device__` and `__host__` annotations in the complex case. Make it less UB.
Note that this still rather unsavory code: `std::real` is only `constexpr` from C++14 on onwards ( https://en.cppreference.com/w/cpp/numeric/complex/real2 ) which is the requirement for `__device__`.
What I am trying to say is: this particular piece of code should not have passed review and not been merged, IMHO, as it tries to codify UB.
Also note that the benchmarks referenced in source were CPU and CUDA-only.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29547
Differential Revision: D18428156
Pulled By: bddppq
fbshipit-source-id: 855ced903ef91bd7f82fcd3a2167ae59bdd30d8b
