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/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 062b9d9..f7c1d06 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -2759,15 +2759,15 @@
}
// fold select C, 0, X -> ~C & X
if (VT == VT0 && VT == MVT::i1 && N1C && N1C->isNullValue()) {
- SDValue XORNode = DAG.getNode(ISD::XOR, VT, N0, DAG.getConstant(1, VT));
- AddToWorkList(XORNode.getNode());
- return DAG.getNode(ISD::AND, VT, XORNode, N2);
+ SDValue NOTNode = DAG.getNOT(N0, VT);
+ AddToWorkList(NOTNode.getNode());
+ return DAG.getNode(ISD::AND, VT, NOTNode, N2);
}
// fold select C, X, 1 -> ~C | X
if (VT == VT0 && VT == MVT::i1 && N2C && N2C->getAPIntValue() == 1) {
- SDValue XORNode = DAG.getNode(ISD::XOR, VT, N0, DAG.getConstant(1, VT));
- AddToWorkList(XORNode.getNode());
- return DAG.getNode(ISD::OR, VT, XORNode, N1);
+ SDValue NOTNode = DAG.getNOT(N0, VT);
+ AddToWorkList(NOTNode.getNode());
+ return DAG.getNode(ISD::OR, VT, NOTNode, N1);
}
// fold select C, X, 0 -> C & X
// FIXME: this should check for C type == X type, not i1?
@@ -5574,8 +5574,7 @@
if (N1C && N1C->isNullValue() && CC == ISD::SETGT) {
SDValue NegN0 = DAG.getNode(ISD::SUB, XType, DAG.getConstant(0, XType),
N0);
- SDValue NotN0 = DAG.getNode(ISD::XOR, XType, N0,
- DAG.getConstant(~0ULL, XType));
+ SDValue NotN0 = DAG.getNOT(N0, XType);
return DAG.getNode(ISD::SRL, XType,
DAG.getNode(ISD::AND, XType, NegN0, NotN0),
DAG.getConstant(XType.getSizeInBits()-1,