1 files changed, 8 insertions, 15 deletions

diff --git a/llvm/tools/llvm-mca/CodeRegion.h b/llvm/tools/llvm-mca/CodeRegion.h
index 1cdfeabfef4..cc474b78ca7 100644
--- a/llvm/tools/llvm-mca/CodeRegion.h
+++ b/llvm/tools/llvm-mca/CodeRegion.h
@@ -34,6 +34,7 @@
 #define LLVM_TOOLS_LLVM_MCA_CODEREGION_H
 
 #include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/MC/MCInst.h"
 #include "llvm/Support/SMLoc.h"
@@ -50,7 +51,7 @@ class CodeRegion {
   // An optional descriptor for this region.
   llvm::StringRef Description;
   // Instructions that form this region.
-  std::vector<llvm::MCInst> Instructions;
+  llvm::SmallVector<llvm::MCInst, 8> Instructions;
   // Source location range.
   llvm::SMLoc RangeStart;
   llvm::SMLoc RangeEnd;
@@ -82,20 +83,15 @@ class CodeRegions {
   // A source manager. Used by the tool to generate meaningful warnings.
   llvm::SourceMgr &SM;
 
-  std::vector<std::unique_ptr<CodeRegion>> Regions;
-
-  // Construct a new region of code guarded by LLVM-MCA comments.
-  void addRegion(llvm::StringRef Description, llvm::SMLoc Loc) {
-    Regions.emplace_back(llvm::make_unique<CodeRegion>(Description, Loc));
-  }
+  using UniqueCodeRegion = std::unique_ptr<CodeRegion>;
+  std::vector<UniqueCodeRegion> Regions;
 
   CodeRegions(const CodeRegions &) = delete;
   CodeRegions &operator=(const CodeRegions &) = delete;
 
 public:
-  typedef std::vector<std::unique_ptr<CodeRegion>>::iterator iterator;
-  typedef std::vector<std::unique_ptr<CodeRegion>>::const_iterator
-      const_iterator;
+  typedef std::vector<UniqueCodeRegion>::iterator iterator;
+  typedef std::vector<UniqueCodeRegion>::const_iterator const_iterator;
 
   iterator begin() { return Regions.begin(); }
   iterator end() { return Regions.end(); }
@@ -107,17 +103,14 @@ public:
   void addInstruction(const llvm::MCInst &Instruction);
   llvm::SourceMgr &getSourceMgr() const { return SM; }
 
-  CodeRegions(llvm::SourceMgr &S) : SM(S) {
-    // Create a default region for the input code sequence.
-    addRegion("Default", llvm::SMLoc());
-  }
+  CodeRegions(llvm::SourceMgr &S);
 
   llvm::ArrayRef<llvm::MCInst> getInstructionSequence(unsigned Idx) const {
     return Regions[Idx]->getInstructions();
   }
 
   bool empty() const {
-    return llvm::all_of(Regions, [](const std::unique_ptr<CodeRegion> &Region) {
+    return llvm::all_of(Regions, [](const UniqueCodeRegion &Region) {
       return Region->empty();
     });
   }