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40d1e2f8c7
Presently, igammac_impl::Run calls igamma_impl::Run, which in turn calls igammac_impl::Run. This isn't actually mutual recursion; the calls are guarded such that we never get into a loop. Nonetheless, it's a stretch for clang to prove this. As a result, clang emits a recursive call in both igammac_impl::Run and igamma_impl::Run. That this is suboptimal code is bad enough, but it's particularly bad when compiling for CUDA/nvptx. nvptx allows recursion, but only begrudgingly: If you have recursive calls in a kernel, it's on you to manually specify the kernel's stack size. Otherwise, ptxas will dump a warning, make a guess, and who knows if it's right. This change explicitly eliminates the mutual recursion in igammac_impl::Run and igamma_impl::Run.
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
For more information go to http://eigen.tuxfamily.org/.