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...So I think the best bet for this optimization for now is to do it based on the knowledge that printf doesn't modify that particular argument. John. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20101011/ee16db77/attachment.html>

On Mon, Oct 11, 2010 at 12:30 PM, John McCall <rjmccall at apple.com> wrote: > On Oct 11, 2010, at 9:12 AM, Kenneth Uildriks wrote: >> 3. The front-end, recognizing that scribbling on an instance's vtbl >> pointer has undefined results, eliminated the loads of the vtbl >> pointer and replaced them with @classvtbl.TestVirtual.  This would >> allow