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Add back a workaround that fixes some breakages from chris's last change.

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Neither of us have yet figured out why this code is necessary, but stuff
breaks if its not there.  Still tracking this down...

llvm-svn: 23617
This commit is contained in:
Nate Begeman 2005-10-04 00:37:37 +00:00
parent cd43592209
commit 2dcd06e46c
1 changed files with 13 additions and 2 deletions
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13
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -623,9 +623,20 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
// Do not try to legalize the target-specific arguments (#1+)
Tmp2 = Node->getOperand(0);
if (Tmp1 != Tmp2)
if (Tmp1 != Tmp2) {
Node->setAdjCallChain(Tmp1);
// If moving the operand from pointing to Tmp2 dropped its use count to 1,
// this will cause the maps used to memoize results to get confused.
// Create and add a dummy use, just to increase its use count. This will
// be removed at the end of legalize when dead nodes are removed.
if (Tmp2.Val->hasOneUse()) {
// FIXME: find out why this code is necessary
DAG.getNode(ISD::PCMARKER, MVT::Other, Tmp2,
DAG.getConstant(0, MVT::i32));
}
}
// Note that we do not create new CALLSEQ_DOWN/UP nodes here. These
// nodes are treated specially and are mutated in place. This makes the dag
// legalization process more efficient and also makes libcall insertion