[PATCH] D16593: [CUDA] Implemented device-side support for functions in <cmath>.

[Artem Belevich via cfe-commits]

tra created this revision.
tra added a reviewer: jlebar.
tra added a subscriber: cfe-commits.

CUDA expects math functions in std:: namespace to work on device side.
In order to make it work with clang without allowing device-side code
generation for functions w/o appropriate target attributes, this patch
provides device-side implementations for <cmath> functions. Most of
them call global-scope math functions provided by CUDA headers. In few
cases we use clang builtins.
    
Tested out-of tree by compiling and running thrust's unit_tests.
https://github.com/thrust/thrust/tree/master/testing


http://reviews.llvm.org/D16593

Files:
  lib/Headers/CMakeLists.txt
  lib/Headers/__clang_cuda_cmath.h
  lib/Headers/__clang_cuda_runtime_wrapper.h

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