On Aug 31, 2011, at 1:27 AM, Artem Shinkarov wrote: >> If you're going to add vector shuffling builtins, you might consider adding >> the same builtin that clang has for compatibility: >> http://clang.llvm.org/docs/LanguageExtensions.html#__builtin_shufflevector >> >> It should be straight-forward to map it into the same IR. >> >> -Chris >> > > Chris > > I am trying to use OpenCL syntax here which says that the mask for > shuffling is a vector. Also I didn't really get from the clang > description if the indexes could be non-constnants? If not, then I > have a problem here, because I want to support this.
Yes, constant elements are required for this builtin. It is an implementation detail, but Clang doesn't implement the OpenCL shuffle operations with builtins. -Chris
