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...deduce that tmp2 can really take > its value from function call? No, because the callee and caller may be in different translation units. -Chris -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20080516/847ac366/attachment.html>

To me, this "optimization" problem doesn't seem to be a consequence of doing the promotion differently than what is currently being done in llvm. Anyways, I don't agree that the information is completely lost. Shouldn't an llvm pass be able to figure out if the truncated value is coming from a function call, and since it is aware of calling convention, it should be able to