Fold trivial two-operand tokenfactors where the operands are equal

immediately.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56921 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index eba3a2a9ce410b27967a5f722fcab37542ccdf11..3d0a2d6e50cce2989bff7099ca5f3d0a6127deff 100644 (file)
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2320,6 +2320,7 @@ SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT,
     // Fold trivial token factors.
     if (N1.getOpcode() == ISD::EntryToken) return N2;
     if (N2.getOpcode() == ISD::EntryToken) return N1;
+    if (N1 == N2) return N1;
     break;
   case ISD::CONCAT_VECTORS:
     // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to