diff options
| -rw-r--r-- | lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp index a59325e4f2..2250c7f431 100644 --- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp +++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp @@ -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 |