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...whether an argument is a byval pointer or not, and instcombine will come along and try to simplify the casts: https://llvm.org/bugs/show_bug.cgi?id=21573 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20161209/2e28d7b8/attachment.html>

On Thu, Dec 8, 2016 at 5:37 PM, Mehdi Amini <mehdi.amini at apple.com> wrote: > So IIUC basically the *only* reason for this IR change is that we don’t > want to pattern match in debug build? > I don't understand right now why we wouldn’t want to do this? > If we need to pattern match such a basic construct, it suggests to me that we have the wrong representation, and we