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So if I create a value with a DAG.getUndef(myVT); call during instruction legalization, how can I access that value as input in another BB/DAG (also during instruction legalization) without worrying about live-ins and/or phi nodes? Can I create a single virtual register and build both a CopyToReg and a CopyFromReg node with it? I assumed that would break SSA. Perhaps I should have said that what

...ted virtual register from one MBB/DAG to another. You have to remember the number somewhere, so you can use CopyFromReg on the vreg. - Matthias -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20160823/6ffffac5/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: graycol.gif Type: image/gif Size: 105 bytes Desc: not available URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20160823/6ffffac5/attachment.gif>