[cfe-dev] On which option should vector operator ? : depend?

[Daniel Dunbar]

On Wed, Sep 29, 2010 at 11:23 AM, Douglas Gregor <dgregor at apple.com> wrote:
>
> On Sep 29, 2010, at 11:08 AM, Sebastian Redl wrote:
>
>>
>> On Sep 29, 2010, at 11:01 AM, Daniel Dunbar wrote:
>>
>>> On Wed, Sep 29, 2010 at 10:41 AM, Sebastian Redl
>>> <sebastian.redl at getdesigned.at> wrote:
>>>> It seems weird to me too, but I think the question here is not whether to have it - IIUC OpenCL demands it - but whether it makes sense to make it work conditionally only for some language flags. And IMO, if you have ?: mean vector select in one dialect, you might as well make it work in all of them.
>>>
>>> Why? OpenCL is a different language in many ways.
>>
>> AltiVec vector support isn't.
>
> For AltiVec support, we have precedent to follow: what does GCC do? We need to do the same.
>
> Now, Clang's ext_vector_type is a specific vector type that Clang added for OpenCL. It seems reasonable that it would have OpenCL's semantics, regardless of dialect. For example, we permit the OpenCL "vec.xyzw" syntax for ext_vector_type vectors in all dialects.

Yes, but that syntax has no (sensical) precedent in C, so programmers
aren't likely to confuse it with "what C would normally do", at least
in code that compiles.

 - Daniel

>
>        - Doug