[1/*] I wanted to post a brief illustration of how hard it is to use CLANG when you're trying to write anything that needs to be carefully optimized. I am not cherry-picking this - this happens to me literally all the time with CLANG.
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It does, and maybe comparing ISPC to intrisics isn't the best way to describe the value one can get out from ISPC. I would often see plain C++ code optimization fail miserably and ISPC grants me just enough extra control over vectorization and other goodies.
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I do like the idea of ISPC (although I've never used it myself), but most of the time these LLVM disasters really don't have much to do with vectorization. So it's kind of a separate problem. C++ is definitely terrible at expressing vectorization, though, that is true!
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