diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 30 |
1 files changed, 0 insertions, 30 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index d5c1deeab7b..cb19c0a4e0f 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -19047,36 +19047,6 @@ SDValue DAGCombiner::SimplifySelectCC(const SDLoc &DL, SDValue N0, SDValue N1, getShiftAmountTy(Temp.getValueType()))); } - // Check to see if this is an integer abs. - // select_cc setg[te] X, 0, X, -X -> - // select_cc setgt X, -1, X, -X -> - // select_cc setl[te] X, 0, -X, X -> - // select_cc setlt X, 1, -X, X -> - // Y = sra (X, size(X)-1); xor (add (X, Y), Y) - if (N1C) { - ConstantSDNode *SubC = nullptr; - if (((N1C->isNullValue() && (CC == ISD::SETGT || CC == ISD::SETGE)) || - (N1C->isAllOnesValue() && CC == ISD::SETGT)) && - N0 == N2 && N3.getOpcode() == ISD::SUB && N0 == N3.getOperand(1)) - SubC = dyn_cast<ConstantSDNode>(N3.getOperand(0)); - else if (((N1C->isNullValue() && (CC == ISD::SETLT || CC == ISD::SETLE)) || - (N1C->isOne() && CC == ISD::SETLT)) && - N0 == N3 && N2.getOpcode() == ISD::SUB && N0 == N2.getOperand(1)) - SubC = dyn_cast<ConstantSDNode>(N2.getOperand(0)); - - if (SubC && SubC->isNullValue() && CmpOpVT.isInteger()) { - SDLoc DL(N0); - SDValue Shift = DAG.getNode(ISD::SRA, DL, CmpOpVT, N0, - DAG.getConstant(CmpOpVT.getSizeInBits() - 1, - DL, - getShiftAmountTy(CmpOpVT))); - SDValue Add = DAG.getNode(ISD::ADD, DL, CmpOpVT, N0, Shift); - AddToWorklist(Shift.getNode()); - AddToWorklist(Add.getNode()); - return DAG.getNode(ISD::XOR, DL, CmpOpVT, Add, Shift); - } - } - // select_cc seteq X, 0, sizeof(X), ctlz(X) -> ctlz(X) // select_cc seteq X, 0, sizeof(X), ctlz_zero_undef(X) -> ctlz(X) // select_cc seteq X, 0, sizeof(X), cttz(X) -> cttz(X) |
