[LVer] Fix FIXME: hide addPHINodes, NFC

Since Ashutosh made findDefsUsedOutsideOfLoop public, we can clean this
up.

Now clients that don't compute DefsUsedOutsideOfLoop can just call
versionLoop() and computing DefsUsedOutsideOfLoop will happen
implicitly.  With that there is no reason to expose addPHINodes anymore.

Ashutosh, you can now drop the calls to findDefsUsedOutsideOfLoop and
addPHINodes in LVerLICM and things should just work.

llvm-svn: 245579

llvm/include/llvm/Transforms/Utils/LoopVersioning.h

@@ -17,6 +17,7 @@
 #define LLVM_TRANSFORMS_UTILS_LOOPVERSIONING_H
 
 #include "llvm/Transforms/Utils/ValueMapper.h"
+#include "llvm/Transforms/Utils/LoopUtils.h"
 
 namespace llvm {
 
@@ -55,15 +56,11 @@ public:
   ///        analyze L
   ///        if versioning is necessary version L
   ///        transform L
-  void versionLoop();
+  void versionLoop() { versionLoop(findDefsUsedOutsideOfLoop(VersionedLoop)); }
 
-  /// \brief Adds the necessary PHI nodes for the versioned loops based on the
-  /// loop-defined values used outside of the loop.
-  ///
-  /// This needs to be called after versionLoop if there are defs in the loop
-  /// that are used outside the loop.  FIXME: this should be invoked internally
-  /// by versionLoop and made private.
-  void addPHINodes(const SmallVectorImpl<Instruction *> &DefsUsedOutside);
+  /// \brief Same but if the client has already precomputed the set of values
+  /// used outside the loop, this API will allows passing that.
+  void versionLoop(const SmallVectorImpl<Instruction *> &DefsUsedOutside);
 
   /// \brief Returns the versioned loop.  Control flows here if pointers in the
   /// loop don't alias (i.e. all memchecks passed).  (This loop is actually the
@@ -75,6 +72,13 @@ public:
   Loop *getNonVersionedLoop() { return NonVersionedLoop; }
 
 private:
+  /// \brief Adds the necessary PHI nodes for the versioned loops based on the
+  /// loop-defined values used outside of the loop.
+  ///
+  /// This needs to be called after versionLoop if there are defs in the loop
+  /// that are used outside the loop.
+  void addPHINodes(const SmallVectorImpl<Instruction *> &DefsUsedOutside);
+
   /// \brief The original loop.  This becomes the "versioned" one.  I.e.,
   /// control flows here if pointers in the loop don't alias.
   Loop *VersionedLoop;

llvm/lib/Transforms/Scalar/LoopDistribute.cpp

@@ -776,8 +776,7 @@ private:
       DEBUG(dbgs() << "\nPointers:\n");
       DEBUG(LAI.getRuntimePointerChecking()->printChecks(dbgs(), Checks));
       LoopVersioning LVer(std::move(Checks), LAI, L, LI, DT);
-      LVer.versionLoop();
-      LVer.addPHINodes(DefsUsedOutside);
+      LVer.versionLoop(DefsUsedOutside);
     }
 
     // Create identical copies of the original loop for each partition and hook

llvm/lib/Transforms/Utils/LoopVersioning.cpp

@@ -40,7 +40,8 @@ LoopVersioning::LoopVersioning(const LoopAccessInfo &LAInfo, Loop *L,
   assert(L->getLoopPreheader() && "No preheader");
 }
 
-void LoopVersioning::versionLoop() {
+void LoopVersioning::versionLoop(
+    const SmallVectorImpl<Instruction *> &DefsUsedOutside) {
   Instruction *FirstCheckInst;
   Instruction *MemRuntimeCheck;
   // Add the memcheck in the original preheader (this is empty initially).
@@ -77,6 +78,10 @@ void LoopVersioning::versionLoop() {
   // The loops merge in the original exit block.  This is now dominated by the
   // memchecking block.
   DT->changeImmediateDominator(VersionedLoop->getExitBlock(), MemCheckBB);
+
+  // Adds the necessary PHI nodes for the versioned loops based on the
+  // loop-defined values used outside of the loop.
+  addPHINodes(DefsUsedOutside);
 }
 
 void LoopVersioning::addPHINodes(