Remove the very substantial, largely unmaintained legacy PGO

infrastructure.

This was essentially work toward PGO based on a design that had several
flaws, partially dating from a time when LLVM had a different
architecture, and with an effort to modernize it abandoned without being
completed. Since then, it has bitrotted for several years further. The
result is nearly unusable, and isn't helping any of the modern PGO
efforts. Instead, it is getting in the way, adding confusion about PGO
in LLVM and distracting everyone with maintenance on essentially dead
code. Removing it paves the way for modern efforts around PGO.

Among other effects, this removes the last of the runtime libraries from
LLVM. Those are being developed in the separate 'compiler-rt' project
now, with somewhat different licensing specifically more approriate for
runtimes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191835 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 8 deletions

diff --git a/lib/Transforms/Scalar/CodeGenPrepare.cpp b/lib/Transforms/Scalar/CodeGenPrepare.cpp
index 9b56a76962..007e9b79e2 100644
--- a/lib/Transforms/Scalar/CodeGenPrepare.cpp
+++ b/lib/Transforms/Scalar/CodeGenPrepare.cpp
@@ -22,7 +22,6 @@
 #include "llvm/Analysis/DominatorInternals.h"
 #include "llvm/Analysis/Dominators.h"
 #include "llvm/Analysis/InstructionSimplify.h"
-#include "llvm/Analysis/ProfileInfo.h"
 #include "llvm/Assembly/Writer.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DataLayout.h"
@@ -80,7 +79,6 @@ namespace {
     const TargetLowering *TLI;
     const TargetLibraryInfo *TLInfo;
     DominatorTree *DT;
-    ProfileInfo *PFI;
 
     /// CurInstIterator - As we scan instructions optimizing them, this is the
     /// next instruction to optimize.  Xforms that can invalidate this should
@@ -111,7 +109,6 @@ namespace {
 
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.addPreserved<DominatorTree>();
-      AU.addPreserved<ProfileInfo>();
       AU.addRequired<TargetLibraryInfo>();
     }
 
@@ -151,7 +148,6 @@ bool CodeGenPrepare::runOnFunction(Function &F) {
   if (TM) TLI = TM->getTargetLowering();
   TLInfo = &getAnalysis<TargetLibraryInfo>();
   DT = getAnalysisIfAvailable<DominatorTree>();
-  PFI = getAnalysisIfAvailable<ProfileInfo>();
   OptSize = F.getAttributes().hasAttribute(AttributeSet::FunctionIndex,
                                            Attribute::OptimizeForSize);
 
@@ -442,10 +438,6 @@ void CodeGenPrepare::EliminateMostlyEmptyBlock(BasicBlock *BB) {
     DT->changeImmediateDominator(DestBB, NewIDom);
     DT->eraseNode(BB);
   }
-  if (PFI) {
-    PFI->replaceAllUses(BB, DestBB);
-    PFI->removeEdge(ProfileInfo::getEdge(BB, DestBB));
-  }
   BB->eraseFromParent();
   ++NumBlocksElim;