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...t.group !0 <-- Per state rules, this value forwards from previous vtable load %foo2 = load %vtable2 + X, !invariant.group !1 call %foo2(%a) Philip -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150731/e35aa01c/attachment.html>

On Fri, Jul 31, 2015 at 3:53 PM, Philip Reames <listmail at philipreames.com> wrote: > > Quoting from the google doc: "If we don’t know definition of some > function, we assume that it will not call @llvm.invariant.group.barrier(). > " > This part really really bugs me. We generally try to assume minimal > knowledge of external functions (i.e. they can do