Continuing (and forking :-)) the discussion started by Renato (http://lists.cs.uiuc.edu/pipermail/cfe-dev/2014-February/035162.html), what is the community’s opinion on introducing pragma simd support in clang?
One possibility is to commit “#pragma omp simd” implementation, which is a part of OpenMP 4 standard (http://www.openmp.org/mp-documents/OpenMP4.0.0.pdf, section 2.8). I see two downsides here: a) “omp” prefix (which might be confusing to some) and b) necessity to add -fopenmp to enable support (this also automatically links OpenMP RTL, which has nothing to do with this particular pragma).
Another possibility is to drop omp prefix – this removes the downsides mentioned above (and yes, makes the pragma similar to what is proposed in CilkPlus – not necessarily a bad thing in itself).
IMHO, both alternatives provide a useful, standards-based tool to control vectorization in clang / llvm compiler – while also advancing clang’s compatibility with existing standards.
We (Intel) can contribute all required code – implementation is ready, just needs some massaging before submission to clang trunk.