diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 1926c2adb5..6790adb9d2 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -436,11 +436,18 @@ SDOperand SelectionDAG::getSetCC(ISD::CondCode Cond, MVT::ValueType VT, N2C = cast<ConstantSDNode>(N2.Val); } + if ((Cond == ISD::SETLT || Cond == ISD::SETULT) && C2 == MinVal) + return getConstant(0, VT); // X < MIN --> false + + // Canonicalize setgt X, Min --> setne X, Min + if ((Cond == ISD::SETGT || Cond == ISD::SETUGT) && C2 == MinVal) + return getSetCC(ISD::SETNE, VT, N1, N2); + // If we have setult X, 1, turn it into seteq X, 0 if ((Cond == ISD::SETLT || Cond == ISD::SETULT) && C2 == MinVal+1) return getSetCC(ISD::SETEQ, VT, N1, getConstant(MinVal, N1.getValueType())); - // If we have setult X, 1, turn it into seteq X, 0 + // If we have setugt X, Max-1, turn it into seteq X, Max else if ((Cond == ISD::SETGT || Cond == ISD::SETUGT) && C2 == MaxVal-1) return getSetCC(ISD::SETEQ, VT, N1, getConstant(MaxVal, N1.getValueType())); |