diff options
Diffstat (limited to 'llvm')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 30 |
1 files changed, 14 insertions, 16 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 2863ec39421..6b6a1d97282 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -30007,7 +30007,7 @@ static SDValue combineOr(SDNode *N, SelectionDAG &DAG, return SDValue(); } -// Generate NEG and CMOV for integer abs. +/// Generate NEG and CMOV for integer abs. static SDValue combineIntegerAbs(SDNode *N, SelectionDAG &DAG) { EVT VT = N->getValueType(0); @@ -30023,21 +30023,19 @@ static SDValue combineIntegerAbs(SDNode *N, SelectionDAG &DAG) { // Check pattern of XOR(ADD(X,Y), Y) where Y is SRA(X, size(X)-1) // and change it to SUB and CMOV. if (VT.isInteger() && N->getOpcode() == ISD::XOR && - N0.getOpcode() == ISD::ADD && - N0.getOperand(1) == N1 && - N1.getOpcode() == ISD::SRA && - N1.getOperand(0) == N0.getOperand(0)) - if (ConstantSDNode *Y1C = dyn_cast<ConstantSDNode>(N1.getOperand(1))) - if (Y1C->getAPIntValue() == VT.getSizeInBits()-1) { - // Generate SUB & CMOV. - SDValue Neg = DAG.getNode(X86ISD::SUB, DL, DAG.getVTList(VT, MVT::i32), - DAG.getConstant(0, DL, VT), N0.getOperand(0)); - - SDValue Ops[] = { N0.getOperand(0), Neg, - DAG.getConstant(X86::COND_GE, DL, MVT::i8), - SDValue(Neg.getNode(), 1) }; - return DAG.getNode(X86ISD::CMOV, DL, DAG.getVTList(VT, MVT::Glue), Ops); - } + N0.getOpcode() == ISD::ADD && N0.getOperand(1) == N1 && + N1.getOpcode() == ISD::SRA && N1.getOperand(0) == N0.getOperand(0)) { + auto *Y1C = dyn_cast<ConstantSDNode>(N1.getOperand(1)); + if (Y1C && Y1C->getAPIntValue() == VT.getSizeInBits() - 1) { + // Generate SUB & CMOV. + SDValue Neg = DAG.getNode(X86ISD::SUB, DL, DAG.getVTList(VT, MVT::i32), + DAG.getConstant(0, DL, VT), N0.getOperand(0)); + SDValue Ops[] = {N0.getOperand(0), Neg, + DAG.getConstant(X86::COND_GE, DL, MVT::i8), + SDValue(Neg.getNode(), 1)}; + return DAG.getNode(X86ISD::CMOV, DL, DAG.getVTList(VT, MVT::Glue), Ops); + } + } return SDValue(); } |
