diff --git a/llvm/include/llvm/Analysis/TargetTransformInfo.h b/llvm/include/llvm/Analysis/TargetTransformInfo.h
--- a/llvm/include/llvm/Analysis/TargetTransformInfo.h
+++ b/llvm/include/llvm/Analysis/TargetTransformInfo.h
@@ -95,7 +95,7 @@
 /// Attributes of a target dependent hardware loop.
 struct HardwareLoopInfo {
   HardwareLoopInfo() = delete;
-  HardwareLoopInfo(Loop *L) : L(L) {}
+  HardwareLoopInfo(Loop *L);
   Loop *L = nullptr;
   BasicBlock *ExitBlock = nullptr;
   BranchInst *ExitBranch = nullptr;
diff --git a/llvm/lib/Analysis/TargetTransformInfo.cpp b/llvm/lib/Analysis/TargetTransformInfo.cpp
--- a/llvm/lib/Analysis/TargetTransformInfo.cpp
+++ b/llvm/lib/Analysis/TargetTransformInfo.cpp
@@ -108,6 +108,14 @@
   Arguments.insert(Arguments.begin(), Args.begin(), Args.end());
 }
 
+HardwareLoopInfo::HardwareLoopInfo(Loop *L) : L(L) {
+  // Match default options:
+  // - hardware-loop-counter-bitwidth = 32
+  // - hardware-loop-decrement = 1
+  CountType = Type::getInt32Ty(L->getHeader()->getContext());
+  LoopDecrement = ConstantInt::get(CountType, 1);
+}
+
 bool HardwareLoopInfo::isHardwareLoopCandidate(ScalarEvolution &SE,
                                                LoopInfo &LI, DominatorTree &DT,
                                                bool ForceNestedLoop,
diff --git a/llvm/test/Transforms/HardwareLoops/unexpected-inputs.ll b/llvm/test/Transforms/HardwareLoops/unexpected-inputs.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/Transforms/HardwareLoops/unexpected-inputs.ll
@@ -0,0 +1,37 @@
+; RUN: opt -passes='hardware-loops<force-hardware-loops>' -S %s -o - | FileCheck %s --check-prefix=CHECK
+; RUN: opt -passes='hardware-loops<force-hardware-loops;hardware-loop-decrement=1>' -S %s -o - | FileCheck %s --check-prefix=CHECK
+; RUN: opt -passes='hardware-loops<force-hardware-loops;hardware-loop-counter-bitwidth=32>' -S %s -o - | FileCheck %s --check-prefix=CHECK
+
+define void @while_lt(i32 %i, i32 %N, ptr nocapture %A) {
+; CHECK-LABEL: @while_lt(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP4:%.*]] = icmp ult i32 [[I:%.*]], [[N:%.*]]
+; CHECK-NEXT:    br i1 [[CMP4]], label [[WHILE_BODY_PREHEADER:%.*]], label [[WHILE_END:%.*]]
+; CHECK:       while.body.preheader:
+; CHECK-NEXT:    [[TMP0:%.*]] = sub i32 [[N]], [[I]]
+; CHECK-NEXT:    call void @llvm.set.loop.iterations.i32(i32 [[TMP0]])
+; CHECK-NEXT:    br label [[WHILE_BODY:%.*]]
+; CHECK:       while.body:
+; CHECK-NEXT:    [[I_ADDR_05:%.*]] = phi i32 [ [[INC:%.*]], [[WHILE_BODY]] ], [ [[I]], [[WHILE_BODY_PREHEADER]] ]
+; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i32 [[I_ADDR_05]]
+; CHECK-NEXT:    store i32 [[I_ADDR_05]], ptr [[ARRAYIDX]], align 4
+; CHECK-NEXT:    [[INC]] = add nuw i32 [[I_ADDR_05]], 1
+; CHECK-NEXT:    [[TMP1:%.*]] = call i1 @llvm.loop.decrement.i32(i32 1)
+; CHECK-NEXT:    br i1 [[TMP1]], label [[WHILE_BODY]], label [[WHILE_END]]
+; CHECK:       while.end:
+; CHECK-NEXT:    ret void
+entry:
+  %cmp4 = icmp ult i32 %i, %N
+  br i1 %cmp4, label %while.body, label %while.end
+
+while.body:
+  %i.addr.05 = phi i32 [ %inc, %while.body ], [ %i, %entry ]
+  %arrayidx = getelementptr inbounds i32, ptr %A, i32 %i.addr.05
+  store i32 %i.addr.05, ptr %arrayidx, align 4
+  %inc = add nuw i32 %i.addr.05, 1
+  %exitcond = icmp eq i32 %inc, %N
+  br i1 %exitcond, label %while.end, label %while.body
+
+while.end:
+  ret void
+}