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On May 9, 2013, at 6:34 PM, Nick Lewycky <nlewycky at google.com> wrote: > I'm looking into how we can improve devirtualization in clang, and there a language in C++ feature I'd like to take advantage of which would let us perform elimination of more vptr loads. In this code: > > Cls *p = new Cls; > p->virtual_method1(); > p->method_changing_vptr(); //

I'm looking into how we can improve devirtualization in clang, and there a language in C++ feature I'd like to take advantage of which would let us perform elimination of more vptr loads. In this code: Cls *p = new Cls; p->virtual_method1(); p->method_changing_vptr(); // uses placement new to legally change the vptr p->virtual_method2(); // invalid! Cls *q = p;

...erpret_cast<A*>(buffer); B *b = reinterpret_cast<B*>(buffer); new(buffer) A; a->vfn(); new(buffer) B; b->vfn(); Valid? Nick -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130509/06228a9a/attachment.html>