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 eba3a2a..3d0a2d6 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2320,6 +2320,7 @@
// 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