/*========================== begin_copyright_notice ============================

Copyright (C) 2025 Intel Corporation

SPDX-License-Identifier: MIT

============================= end_copyright_notice ===========================*/

/*========================== begin_copyright_notice ============================

Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
See https://llvm.org/LICENSE.txt for license information.
SPDX-License-Identifier: Apache-2.0 with LLVM-exception

============================= end_copyright_notice ===========================*/

This comes from patches of LLVM 14 (copy-pasted from there)

diff --git a/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp b/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
index 9beb2281c..a3cc73ca5 100644
--- a/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
@@ -968,7 +968,7 @@ bool llvm::computeUnrollCount(
   // cost of exact full unrolling.  As such, if we have an exact count and
   // found it unprofitable, we'll never chose to bounded unroll.
   if (!TripCount && MaxTripCount && (UP.UpperBound || MaxOrZero) &&
-      MaxTripCount <= UnrollMaxUpperBound) {
+      MaxTripCount < std::max(16U, UnrollMaxUpperBound.getValue())) {
     UP.Count = MaxTripCount;
     if (auto UnrollFactor = shouldFullUnroll(L, TTI, DT, SE, EphValues,
                                              MaxTripCount, UCE, UP)) {
@@ -1042,7 +1042,8 @@ bool llvm::computeUnrollCount(
   }

   // Don't unroll a small upper bound loop unless user or TTI asked to do so.
-  if (MaxTripCount && !UP.Force && MaxTripCount < UnrollMaxUpperBound) {
+  if (MaxTripCount && !UP.Force &&
+      MaxTripCount < std::max(16U, UnrollMaxUpperBound.getValue())) {
     UP.Count = 0;
     return false;
   }