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....co.uk> wrote: ... > It would be nice to have a __builtin_rotl family in clang, in > my opinion, but it would need back-end support from llvm. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20120729/6a1f68df/attachment.html>

> *NOTE* IIRC compiling this with -O0 on x86-64 can yield the wrong result > since clang will emit shifts and on intel shifts are mod the register > size [...snip...] I remember finding the same thing (although I haven't tried it on a recent clang version) and what I wondered was whether there was mileage in having an explicit intrinsic for rotation (like there is for bit counting,