Add SelectionDAG::getNOT method to construct bitwise NOT operations,
corresponding to the "not" and "vnot" PatFrags. Use the new method
in some places where it seems appropriate.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62768 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 364a121..cd5df4f 100644
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -1798,39 +1798,39 @@
if (N0.getValueType() == MVT::i1 && foldBooleans) {
switch (Cond) {
default: assert(0 && "Unknown integer setcc!");
- case ISD::SETEQ: // X == Y -> (X^Y)^1
+ case ISD::SETEQ: // X == Y -> ~(X^Y)
Temp = DAG.getNode(ISD::XOR, MVT::i1, N0, N1);
- N0 = DAG.getNode(ISD::XOR, MVT::i1, Temp, DAG.getConstant(1, MVT::i1));
+ N0 = DAG.getNOT(Temp, MVT::i1);
if (!DCI.isCalledByLegalizer())
DCI.AddToWorklist(Temp.getNode());
break;
case ISD::SETNE: // X != Y --> (X^Y)
N0 = DAG.getNode(ISD::XOR, MVT::i1, N0, N1);
break;
- case ISD::SETGT: // X >s Y --> X == 0 & Y == 1 --> X^1 & Y
- case ISD::SETULT: // X <u Y --> X == 0 & Y == 1 --> X^1 & Y
- Temp = DAG.getNode(ISD::XOR, MVT::i1, N0, DAG.getConstant(1, MVT::i1));
+ case ISD::SETGT: // X >s Y --> X == 0 & Y == 1 --> ~X & Y
+ case ISD::SETULT: // X <u Y --> X == 0 & Y == 1 --> ~X & Y
+ Temp = DAG.getNOT(N0, MVT::i1);
N0 = DAG.getNode(ISD::AND, MVT::i1, N1, Temp);
if (!DCI.isCalledByLegalizer())
DCI.AddToWorklist(Temp.getNode());
break;
- case ISD::SETLT: // X <s Y --> X == 1 & Y == 0 --> Y^1 & X
- case ISD::SETUGT: // X >u Y --> X == 1 & Y == 0 --> Y^1 & X
- Temp = DAG.getNode(ISD::XOR, MVT::i1, N1, DAG.getConstant(1, MVT::i1));
+ case ISD::SETLT: // X <s Y --> X == 1 & Y == 0 --> ~Y & X
+ case ISD::SETUGT: // X >u Y --> X == 1 & Y == 0 --> ~Y & X
+ Temp = DAG.getNOT(N1, MVT::i1);
N0 = DAG.getNode(ISD::AND, MVT::i1, N0, Temp);
if (!DCI.isCalledByLegalizer())
DCI.AddToWorklist(Temp.getNode());
break;
- case ISD::SETULE: // X <=u Y --> X == 0 | Y == 1 --> X^1 | Y
- case ISD::SETGE: // X >=s Y --> X == 0 | Y == 1 --> X^1 | Y
- Temp = DAG.getNode(ISD::XOR, MVT::i1, N0, DAG.getConstant(1, MVT::i1));
+ case ISD::SETULE: // X <=u Y --> X == 0 | Y == 1 --> ~X | Y
+ case ISD::SETGE: // X >=s Y --> X == 0 | Y == 1 --> ~X | Y
+ Temp = DAG.getNOT(N0, MVT::i1);
N0 = DAG.getNode(ISD::OR, MVT::i1, N1, Temp);
if (!DCI.isCalledByLegalizer())
DCI.AddToWorklist(Temp.getNode());
break;
- case ISD::SETUGE: // X >=u Y --> X == 1 | Y == 0 --> Y^1 | X
- case ISD::SETLE: // X <=s Y --> X == 1 | Y == 0 --> Y^1 | X
- Temp = DAG.getNode(ISD::XOR, MVT::i1, N1, DAG.getConstant(1, MVT::i1));
+ case ISD::SETUGE: // X >=u Y --> X == 1 | Y == 0 --> ~Y | X
+ case ISD::SETLE: // X <=s Y --> X == 1 | Y == 0 --> ~Y | X
+ Temp = DAG.getNOT(N1, MVT::i1);
N0 = DAG.getNode(ISD::OR, MVT::i1, N0, Temp);
break;
}