Index: llvm/lib/Transforms/Scalar/GuardWidening.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/GuardWidening.cpp
+++ llvm/lib/Transforms/Scalar/GuardWidening.cpp
@@ -495,6 +495,9 @@
     makeAvailableAt(Op, Loc);
 
   Inst->moveBefore(Loc);
+  // If we moved instruction before guard we must clean nuw, nsw flags.
+  Inst->setHasNoUnsignedWrap(false);
+  Inst->setHasNoSignedWrap(false);
 }
 
 bool GuardWideningImpl::widenCondCommon(Value *Cond0, Value *Cond1,
Index: llvm/test/Transforms/GuardWidening/range-check-merging.ll
===================================================================
--- llvm/test/Transforms/GuardWidening/range-check-merging.ll
+++ llvm/test/Transforms/GuardWidening/range-check-merging.ll
@@ -340,7 +340,7 @@
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[LENGTH:%.*]] = load i32, i32* [[LENGTH_BUF:%.*]], align 4, !range [[RNG0]]
 ; CHECK-NEXT:    [[CHK0:%.*]] = icmp ult i32 [[X:%.*]], [[LENGTH]]
-; CHECK-NEXT:    [[X_INC1:%.*]] = add nuw nsw i32 [[X]], 1
+; CHECK-NEXT:    [[X_INC1:%.*]] = add i32 [[X]], 1
 ; CHECK-NEXT:    [[CHK1:%.*]] = icmp ult i32 [[X_INC1]], [[LENGTH]]
 ; CHECK-NEXT:    [[WIDE_CHK:%.*]] = and i1 [[CHK0]], [[CHK1]]
 ; CHECK-NEXT:    call void (i1, ...) @llvm.experimental.guard(i1 [[WIDE_CHK]]) [ "deopt"() ]