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...edge and removed the preheader from the loop. for (BasicBlock::iterator II = loopHeaderBB->begin(); (PN=dyn_cast<PHINode>(II)); ++II) { // remove loop back PHI and add it to split BB errs()<<*II<<"\n"; PHINode *newPHIvalue = PHINode::Create(PN->getType(), 2, PN->getName().str(), splitBB->getFirstInsertionPt()); int IDX = PN->getBasicBlockIndex(splitBB); while (IDX != -1) { Value *oldValue = PN->getIncomingValue((unsigned(IDX))); PN->...

...r from the loop. > > for (BasicBlock::iterator II = loopHeaderBB->begin(); > (PN=dyn_cast<PHINode>(II)); ++II) { > // remove loop back PHI and add it to split BB > errs()<<*II<<"\n"; > PHINode *newPHIvalue = PHINode::Create(PN->getType(), 2, > PN->getName().str(), splitBB->getFirstInsertionPt()); > int IDX = PN->getBasicBlockIndex(splitBB); > while (IDX != -1) { > Value *oldValue = PN->getIncomingValue((unsigned(IDX))); >...

I have attached a case of what I am trying to do, I'm pretty sure I'm just missing some simple API call. In the cfg you can see that although Im setting "lsr.iv441" as "lsr.iv44" from for.body.387.i it's not propagating that through the block or graph. On Wed, Mar 7, 2012 at 12:03 PM, Ryan Taylor <ryta1203 at gmail.com> wrote: > I am splitting a one BB

I am splitting a one BB loop into two BB. Basically, the one loop BB has 3 incoming values, one form back edge two from other edges. I want to extract the PHIs from the other two edges out into it's own BB and delete that from the loop, then redirect the backedge to the loopbody (non extracted portion) and create a new PHI coming from the extracted BB and the backedge. I can do this;