Index: llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
===================================================================
--- llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
+++ llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
@@ -437,6 +437,7 @@
   }
 
   void visitOperandShadowInst(Instruction &I);
+  void visitUnaryOperator(UnaryOperator &UO);
   void visitBinaryOperator(BinaryOperator &BO);
   void visitCastInst(CastInst &CI);
   void visitCmpInst(CmpInst &CI);
@@ -1398,6 +1399,10 @@
   DFSF.storeShadow(SI.getPointerOperand(), Size, Align, Shadow, &SI);
 }
 
+void DFSanVisitor::visitUnaryOperator(UnaryOperator &UO) {
+  visitOperandShadowInst(UO);
+}
+
 void DFSanVisitor::visitBinaryOperator(BinaryOperator &BO) {
   visitOperandShadowInst(BO);
 }
Index: llvm/test/Instrumentation/DataFlowSanitizer/arith.ll
===================================================================
--- llvm/test/Instrumentation/DataFlowSanitizer/arith.ll
+++ llvm/test/Instrumentation/DataFlowSanitizer/arith.ll
@@ -62,3 +62,13 @@
   %c = udiv i8 %a, %b
   ret i8 %c
 }
+
+define double @fneg(double %a) {
+  ; CHECK: @"dfs$fneg"
+  ; CHECK: load{{.*}}__dfsan_arg_tls
+  ; CHECK: fneg double
+  ; CHECK: store{{.*}}__dfsan_retval_tls
+  ; CHECK: ret double
+  %c = fneg double %a
+  ret double %c
+}