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...ondered whether the AggressiveAntiDepBreaker can properly handle predicated instructions. At the end of PrescanInstruction the "DefIndices" array is updated with the destination register without checking whether the instruction is predicated. That shortens the live range: Later on, in HandleLastUse we check whether the register IsLive, which considers only "KillIndices" and "DefIndices", and therefore returns False for the interval between the predicated instruction and any non-predicated read before it. So that read is considered the last use. In my example this lead...

I saw there is reference to dead def on registers in LLVM source code. I am not aware of this concept from the traditional course material. What are the properties of dead def? Cheers Thomson -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150101/ea39d1e4/attachment.html>