diff options
author | Dale Johannesen <dalej@apple.com> | 2007-12-06 01:43:46 +0000 |
---|---|---|
committer | Dale Johannesen <dalej@apple.com> | 2007-12-06 01:43:46 +0000 |
commit | a37fd09121d16fbaf6e8c4501a49b2b157390f51 (patch) | |
tree | 8992cd753939e13dcca980a167df0db181539dc6 | |
parent | 4db98aafcd5e4a7e80933110cd64d4cc79300a0a (diff) | |
download | external_llvm-a37fd09121d16fbaf6e8c4501a49b2b157390f51.zip external_llvm-a37fd09121d16fbaf6e8c4501a49b2b157390f51.tar.gz external_llvm-a37fd09121d16fbaf6e8c4501a49b2b157390f51.tar.bz2 |
Fix PR1842.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44649 91177308-0d34-0410-b5e6-96231b3b80d8
-rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 3be1fdd..27709b3 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -2396,6 +2396,10 @@ SDOperand DAGCombiner::visitSELECT(SDNode *N) { MVT::ValueType VT = N->getValueType(0); MVT::ValueType VT0 = N0.getValueType(); + + // Some targets have SETCC types bigger than 1 bit, but do not set all the + // bits to 1; identified by getSetCCResultContents. Watch out for these. + // fold select C, X, X -> X if (N1 == N2) return N1; @@ -2420,14 +2424,22 @@ SDOperand DAGCombiner::visitSELECT(SDNode *N) { return DAG.getNode(ISD::TRUNCATE, VT, XORNode); } // fold select C, 0, X -> ~C & X - if (VT == VT0 && N1C && N1C->isNullValue()) { - SDOperand XORNode = DAG.getNode(ISD::XOR, VT, N0, DAG.getConstant(1, VT)); + if (VT == VT0 && N1C && N1C->isNullValue() && + (N0.Val->getOpcode()!=ISD::SETCC || VT==MVT::i1 || + TLI.getSetCCResultContents()== + TargetLowering::ZeroOrNegativeOneSetCCResult)) { + SDOperand XORNode; + XORNode = DAG.getNode(ISD::XOR, VT, N0, DAG.getConstant(~0UL, VT)); AddToWorkList(XORNode.Val); return DAG.getNode(ISD::AND, VT, XORNode, N2); } // fold select C, X, 1 -> ~C | X - if (VT == VT0 && N2C && N2C->getValue() == 1) { - SDOperand XORNode = DAG.getNode(ISD::XOR, VT, N0, DAG.getConstant(1, VT)); + if (VT == VT0 && N2C && N2C->getValue() == 1 && + (N0.Val->getOpcode()!=ISD::SETCC || VT==MVT::i1 || + TLI.getSetCCResultContents()== + TargetLowering::ZeroOrNegativeOneSetCCResult)) { + SDOperand XORNode; + XORNode = DAG.getNode(ISD::XOR, VT, N0, DAG.getConstant(~0UL, VT)); AddToWorkList(XORNode.Val); return DAG.getNode(ISD::OR, VT, XORNode, N1); } |