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...; </div> <div dir="ltr" >Tim Northover responded with some useful insight but I did not really get a direct answer to my question on how to add MBB inputs (or if it's possible). The solution that I developed myself is to use virtual registers within MBBs and build CopyFrom/ToReg nodes at the BB boundaries with a physreg number, then add this physreg as a live-in where appropriate. This has been working for a few weeks now and, until I discovered this new issue where my live-in is ignored, had no known issues.</div> <div dir="ltr" > </div> <di...

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 stops me is that I don't know how to pass a newly created virtual register from one MBB/DAG to another. Tyler From: Matthias Braun <mbraun at apple.com> To: Tyler Kenney/Marlborough/...

<div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div dir="ltr" > </div> <div dir="ltr" >Hi all,</div> <div dir="ltr" > </div> <div

...g vector value as an input reg for all BBs that reference the original stack object but do not contain it's LIFETIME_START node, and I'd like to add it as an output reg for all BBs that reference the original stack object but do not contain it's LIFETIME_END node. I can create Copy From/ToReg nodes easily enough and I think I can get the reg number using MachineRegisterInfo::createVirtualRegister(). But I don't quite understand how I set up the mapping from the new outputs of some BBs to the new inputs of other BBs. I dug through the code and it looks like I may be able to do this b...