[PATCH] Adding support for NoDuplicate function attribute in CLang

[Marcello Maggioni]

New patch that merges the two separate patches together and also adds 
the NoDuplicate attribute to the ConstructAttributeList functions in 
CGCall.cpp

Cheers,
Marcello

On 15/11/13 10:49, Marcello Maggioni wrote:
> Hi all,
>
> I made a patch that adds the capability of defining the NoDuplicate 
> attribute for a function using both the GNU and CXX11 attribute 
> syntaxes like in:
>
> __attribute__((noduplicate))
> [[noduplicate]]
>
> I also added tests to test out the new addition.
> The NoDuplicate attribute is useful to avoid the application of 
> compiler optimizations like Loop Unswitching to code containing 
> function calls that implement functionality like barriers in OpenCL. 
> These functions could fail if such an optimization is applied on the 
> code that calls them.
>
> I splitted the patch in two files. The "_code" file contains the part 
> that adds the functionality to Clang and the "_tests" part contains 
> the added tests.
>
> Tell me if it is interesting to add this to mainline. If there is a 
> need for corrections I'll be happy to make them.
>
> Cheers,
> Marcello
>
>
>
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