diff --git a/clang/test/Misc/loop-opt-setup.c b/clang/test/Misc/loop-opt-setup.c
--- a/clang/test/Misc/loop-opt-setup.c
+++ b/clang/test/Misc/loop-opt-setup.c
@@ -8,5 +8,13 @@
     a[i] = b += 2;
   return b;
 }
+
+int B(void) {
+#pragma clang loop unroll(full)
+  for (int i = 0; i < 16; ++i)
+    a[i] = b += 2;
+  return b;
+}
+
 // CHECK-NOT: br i1
 
diff --git a/llvm/lib/Passes/PassBuilder.cpp b/llvm/lib/Passes/PassBuilder.cpp
--- a/llvm/lib/Passes/PassBuilder.cpp
+++ b/llvm/lib/Passes/PassBuilder.cpp
@@ -478,10 +478,10 @@
   // Do not enable unrolling in PreLinkThinLTO phase during sample PGO
   // because it changes IR to makes profile annotation in back compile
   // inaccurate.
-  if ((Phase != ThinLTOPhase::PreLink || !PGOOpt ||
-       PGOOpt->Action != PGOOptions::SampleUse) &&
-      PTO.LoopUnrolling)
-    LPM2.addPass(LoopFullUnrollPass(Level, /*OnlyWhenForced=*/false,
+  if (Phase != ThinLTOPhase::PreLink || !PGOOpt ||
+      PGOOpt->Action != PGOOptions::SampleUse)
+    LPM2.addPass(LoopFullUnrollPass(Level,
+                                    /*OnlyWhenForced=*/!PTO.LoopUnrolling,
                                     PTO.ForgetAllSCEVInLoopUnroll));
 
   for (auto &C : LoopOptimizerEndEPCallbacks)