diff --git a/llvm/include/llvm/CodeGen/MachineSizeOpts.h b/llvm/include/llvm/CodeGen/MachineSizeOpts.h
--- a/llvm/include/llvm/CodeGen/MachineSizeOpts.h
+++ b/llvm/include/llvm/CodeGen/MachineSizeOpts.h
@@ -23,14 +23,16 @@
 class MachineFunction;
 
 /// Returns true if machine function \p MF is suggested to be size-optimized
-/// base on the profile.
+/// based on the profile.
 bool shouldOptimizeForSize(const MachineFunction *MF, ProfileSummaryInfo *PSI,
-                           const MachineBlockFrequencyInfo *BFI);
+                           const MachineBlockFrequencyInfo *BFI,
+                           PGSOQueryType QueryType = PGSOQueryType::Other);
 /// Returns true if machine basic block \p MBB is suggested to be size-optimized
-/// base on the profile.
+/// based on the profile.
 bool shouldOptimizeForSize(const MachineBasicBlock *MBB,
                            ProfileSummaryInfo *PSI,
-                           const MachineBlockFrequencyInfo *MBFI);
+                           const MachineBlockFrequencyInfo *MBFI,
+                           PGSOQueryType QueryType = PGSOQueryType::Other);
 
 } // end namespace llvm
 
diff --git a/llvm/include/llvm/Transforms/Utils/SizeOpts.h b/llvm/include/llvm/Transforms/Utils/SizeOpts.h
--- a/llvm/include/llvm/Transforms/Utils/SizeOpts.h
+++ b/llvm/include/llvm/Transforms/Utils/SizeOpts.h
@@ -33,9 +33,14 @@
 class Function;
 class ProfileSummaryInfo;
 
+enum class PGSOQueryType {
+  IRPass,  // A query call from an IR-level transform pass.
+  Other,   // Others.
+};
+
 template<typename AdapterT, typename FuncT, typename BFIT>
 bool shouldFuncOptimizeForSizeImpl(const FuncT *F, ProfileSummaryInfo *PSI,
-                                   BFIT *BFI) {
+                                   BFIT *BFI, PGSOQueryType QueryType) {
   assert(F);
   if (!PSI || !BFI || !PSI->hasProfileSummary())
     return false;
@@ -55,7 +60,7 @@
 
 template<typename AdapterT, typename BlockT, typename BFIT>
 bool shouldOptimizeForSizeImpl(const BlockT *BB, ProfileSummaryInfo *PSI,
-                               BFIT *BFI) {
+                               BFIT *BFI, PGSOQueryType QueryType) {
   assert(BB);
   if (!PSI || !BFI || !PSI->hasProfileSummary())
     return false;
@@ -73,15 +78,17 @@
       BB, PSI, BFI);
 }
 
-/// Returns true if function \p F is suggested to be size-optimized base on the
+/// Returns true if function \p F is suggested to be size-optimized based on the
 /// profile.
 bool shouldOptimizeForSize(const Function *F, ProfileSummaryInfo *PSI,
-                           BlockFrequencyInfo *BFI);
+                           BlockFrequencyInfo *BFI,
+                           PGSOQueryType QueryType = PGSOQueryType::Other);
 
-/// Returns true if basic block \p BB is suggested to be size-optimized base
-/// on the profile.
+/// Returns true if basic block \p BB is suggested to be size-optimized based on
+/// the profile.
 bool shouldOptimizeForSize(const BasicBlock *BB, ProfileSummaryInfo *PSI,
-                           BlockFrequencyInfo *BFI);
+                           BlockFrequencyInfo *BFI,
+                           PGSOQueryType QueryType = PGSOQueryType::Other);
 
 } // end namespace llvm
 
diff --git a/llvm/lib/CodeGen/MachineSizeOpts.cpp b/llvm/lib/CodeGen/MachineSizeOpts.cpp
--- a/llvm/lib/CodeGen/MachineSizeOpts.cpp
+++ b/llvm/lib/CodeGen/MachineSizeOpts.cpp
@@ -107,14 +107,16 @@
 
 bool llvm::shouldOptimizeForSize(const MachineFunction *MF,
                                  ProfileSummaryInfo *PSI,
-                                 const MachineBlockFrequencyInfo *MBFI) {
+                                 const MachineBlockFrequencyInfo *MBFI,
+                                 PGSOQueryType QueryType) {
   return shouldFuncOptimizeForSizeImpl<MachineBasicBlockBFIAdapter>(
-      MF, PSI, MBFI);
+      MF, PSI, MBFI, QueryType);
 }
 
 bool llvm::shouldOptimizeForSize(const MachineBasicBlock *MBB,
                                  ProfileSummaryInfo *PSI,
-                                 const MachineBlockFrequencyInfo *MBFI) {
+                                 const MachineBlockFrequencyInfo *MBFI,
+                                 PGSOQueryType QueryType) {
   return shouldOptimizeForSizeImpl<MachineBasicBlockBFIAdapter>(
-      MBB, PSI, MBFI);
+      MBB, PSI, MBFI, QueryType);
 }
diff --git a/llvm/lib/Transforms/Scalar/ConstantHoisting.cpp b/llvm/lib/Transforms/Scalar/ConstantHoisting.cpp
--- a/llvm/lib/Transforms/Scalar/ConstantHoisting.cpp
+++ b/llvm/lib/Transforms/Scalar/ConstantHoisting.cpp
@@ -553,7 +553,8 @@
   unsigned NumUses = 0;
 
   bool OptForSize = Entry->getParent()->hasOptSize() ||
-                    llvm::shouldOptimizeForSize(Entry->getParent(), PSI, BFI);
+                    llvm::shouldOptimizeForSize(Entry->getParent(), PSI, BFI,
+                                                PGSOQueryType::IRPass);
   if (!OptForSize || std::distance(S,E) > 100) {
     for (auto ConstCand = S; ConstCand != E; ++ConstCand) {
       NumUses += ConstCand->Uses.size();
diff --git a/llvm/lib/Transforms/Scalar/LoopLoadElimination.cpp b/llvm/lib/Transforms/Scalar/LoopLoadElimination.cpp
--- a/llvm/lib/Transforms/Scalar/LoopLoadElimination.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopLoadElimination.cpp
@@ -545,7 +545,8 @@
       auto *HeaderBB = L->getHeader();
       auto *F = HeaderBB->getParent();
       bool OptForSize = F->hasOptSize() ||
-                        llvm::shouldOptimizeForSize(HeaderBB, PSI, BFI);
+                        llvm::shouldOptimizeForSize(HeaderBB, PSI, BFI,
+                                                    PGSOQueryType::IRPass);
       if (OptForSize) {
         LLVM_DEBUG(
             dbgs() << "Versioning is needed but not allowed when optimizing "
diff --git a/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp b/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
--- a/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
@@ -213,7 +213,8 @@
 
   // Apply size attributes
   bool OptForSize = L->getHeader()->getParent()->hasOptSize() ||
-                    llvm::shouldOptimizeForSize(L->getHeader(), PSI, BFI);
+                    llvm::shouldOptimizeForSize(L->getHeader(), PSI, BFI,
+                                                PGSOQueryType::IRPass);
   if (OptForSize) {
     UP.Threshold = UP.OptSizeThreshold;
     UP.PartialThreshold = UP.PartialOptSizeThreshold;
diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -2755,7 +2755,8 @@
   // Don't rewrite fputs to fwrite when optimising for size because fwrite
   // requires more arguments and thus extra MOVs are required.
   bool OptForSize = CI->getFunction()->hasOptSize() ||
-                    llvm::shouldOptimizeForSize(CI->getParent(), PSI, BFI);
+                    llvm::shouldOptimizeForSize(CI->getParent(), PSI, BFI,
+                                                PGSOQueryType::IRPass);
   if (OptForSize)
     return nullptr;
 
diff --git a/llvm/lib/Transforms/Utils/SizeOpts.cpp b/llvm/lib/Transforms/Utils/SizeOpts.cpp
--- a/llvm/lib/Transforms/Utils/SizeOpts.cpp
+++ b/llvm/lib/Transforms/Utils/SizeOpts.cpp
@@ -70,11 +70,15 @@
 } // end anonymous namespace
 
 bool llvm::shouldOptimizeForSize(const Function *F, ProfileSummaryInfo *PSI,
-                                 BlockFrequencyInfo *BFI) {
-  return shouldFuncOptimizeForSizeImpl<BasicBlockBFIAdapter>(F, PSI, BFI);
+                                 BlockFrequencyInfo *BFI,
+                                 PGSOQueryType QueryType) {
+  return shouldFuncOptimizeForSizeImpl<BasicBlockBFIAdapter>(F, PSI, BFI,
+                                                             QueryType);
 }
 
 bool llvm::shouldOptimizeForSize(const BasicBlock *BB, ProfileSummaryInfo *PSI,
-                                 BlockFrequencyInfo *BFI) {
-  return shouldOptimizeForSizeImpl<BasicBlockBFIAdapter>(BB, PSI, BFI);
+                                 BlockFrequencyInfo *BFI,
+                                 PGSOQueryType QueryType) {
+  return shouldOptimizeForSizeImpl<BasicBlockBFIAdapter>(BB, PSI, BFI,
+                                                         QueryType);
 }
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -7434,7 +7434,8 @@
 
   if (Hints.getForce() != LoopVectorizeHints::FK_Enabled &&
       (F->hasOptSize() ||
-       llvm::shouldOptimizeForSize(L->getHeader(), PSI, BFI)))
+       llvm::shouldOptimizeForSize(L->getHeader(), PSI, BFI,
+                                   PGSOQueryType::IRPass)))
     SEL = CM_ScalarEpilogueNotAllowedOptSize;
   else if (PreferPredicateOverEpilog ||
            Hints.getPredicate() == LoopVectorizeHints::FK_Enabled ||