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[CUDA] Update docs to indicate that clang now supports std::complex in CUDA mode. 

The last remaining necessary change was D25403, landed as r287012.

llvm-svn: 287184
This commit is contained in:
Justin Lebar 2016-11-17 01:03:42 +00:00
parent e3b74d3c4d
commit be0cfcc28a
1 changed files with 3 additions and 10 deletions
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13
llvm/docs/CompileCudaWithLLVM.rst
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@ -171,16 +171,9 @@ below). However, we have heard from implementers that it's possible to get
into situations where nvcc will omit a call to an ``std::complex`` function,
especially when compiling without optimizations.
clang does not yet support ``std::complex``. Because we interpret the
"wrong-side rule" more strictly than nvcc, ``std::complex`` doesn't work in
``__device__`` or ``__host__ __device__`` code.
In the meantime, you can get limited ``std::complex`` support in clang by
building your code for C++14. In clang, all ``constexpr`` functions are always
implicitly ``__host__ __device__`` (this corresponds to nvcc's
``--relaxed-constexpr`` flag). In C++14, many ``std::complex`` functions are
``constexpr``, so you can use these with clang. (nvcc does not currently
support C++14.)
As of 2016-11-16, clang supports ``std::complex`` without these caveats. It is
tested with libstdc++ 4.8.5 and newer, but is known to work only with libc++
newer than 2016-11-16.
``<algorithm>``
---------------