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The output of TableGen (intrinsics.gen) seems a bit too clunky specifically the switching parts (input the string, output the enum). Moreover, the code makes MSVC barf due to its nesting limit which even applices to if-else statements. One one hand, gperf (http://www.gnu.org/software/gperf/manual/gperf.html) offers a way to map strings to records without much difficulty (and it does its job