<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Not that I'm aware of.<div><br></div><div>-eric</div><div><br><div><div>On Feb 2, 2012, at 3:47 PM, Ryan Taylor wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">So essentially I'm adding a path inside of the loop. Is there a way to have llvm automatically create new IR and update the PHIs simply by adding a block like this and changing the DomTree?<br><br><div class="gmail_quote">
---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Ryan Taylor</b> <span dir="ltr"><<a href="mailto:ryta1203@gmail.com">ryta1203@gmail.com</a>></span><br>Date: Thu, Feb 2, 2012 at 12:08 PM<br>
Subject: Updating PHI for Instruction Domination?<br>To: <a href="mailto:llvmdev@cs.uiuc.edu">llvmdev@cs.uiuc.edu</a><br><br><br>So I have a loop with two blocks, a header (which points to return and latch) and a latch (which points to return and header). I have inserted a few new blocks, called H and F. <br>
<br>Header now points to H and latch. Latch now points to F. H points to F. F points to Header and return.<br>
<br>The PHI Nodes have been updated in Header accordingly, now coming from the preheader and F (instead of latch).<br><br>My issue is this: The values in the PHI instruction in the Header for F are actually defined in Latch and so if you follow the path: Header->H->F, there becomes an issue with "Instruction does not dominate all uses" (since the Header PHI is getting values defined in Latch coming from F but never going to Latch) since they haven't been defined in that path.<br>
<br>My question is: Is there some call where I can rearrange the basic blocks and call some functions/utils that solve this issue? Or do I have to manually solve this myself?<br><br>Thanks again.<br>
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