[PATCH] Adding support for NoDuplicate function attribute in CLang

[Marcello Maggioni]

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

-- 
Marcello Maggioni

Compiler Engineer

  

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