[PATCH] D20602: Add .rgba syntax extension to ext_vector_type types

[Alexey Bader via cfe-commits]

bader added a subscriber: bader.
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In http://reviews.llvm.org/D20602#438667, @rsmith wrote:

> I'm not suggesting it be treated as invalid. This extension is part of at least OpenCL 2.1, but it's not part of OpenCL 1.0. `ext_vector_type` is Clang's implementation of the OpenCL vector type. Therefore if the user asks us to support OpenCL 1.0, we should give them a warning if they use this syntax.
>
> If we're not building an OpenCL source file, then yes, this is our extension and it makes sense for it to be available unconditionally (without a warning).


To avoid confusion, I'd like to note that rgba selector was first introduced in OpenCL C++ kernel language, which is currently in provisional state and will be part of OpenCL version 2.2. 
https://www.khronos.org/registry/cl/specs/opencl-2.2-cplusplus.pdf (page 18).

OpenCL version 2.1 uses OpenCL C 2.0 kernel language, which doesn't support rgba selector.

https://www.khronos.org/registry/cl/ - latest versions of OpenCL specs.


http://reviews.llvm.org/D20602