Delete the SimplifyHalfPowrLibCalls pass, which was unused, and

only existed as the result of a misunderstanding.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126669 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 0 insertions, 161 deletions

diff --git a/lib/Transforms/Scalar/Scalar.cpp b/lib/Transforms/Scalar/Scalar.cpp
index bf9ca6d803..bb34a9eb4f 100644
--- a/lib/Transforms/Scalar/Scalar.cpp
+++ b/lib/Transforms/Scalar/Scalar.cpp
@@ -56,7 +56,6 @@ void llvm::initializeScalarOpts(PassRegistry &Registry) {
   initializeSROA_DTPass(Registry);
   initializeSROA_SSAUpPass(Registry);
   initializeCFGSimplifyPassPass(Registry);
-  initializeSimplifyHalfPowrLibCallsPass(Registry);
   initializeSimplifyLibCallsPass(Registry);
   initializeSinkingPass(Registry);
   initializeTailDupPass(Registry);
diff --git a/lib/Transforms/Scalar/SimplifyHalfPowrLibCalls.cpp b/lib/Transforms/Scalar/SimplifyHalfPowrLibCalls.cpp
deleted file mode 100644
index 70ff32e023..0000000000
--- a/lib/Transforms/Scalar/SimplifyHalfPowrLibCalls.cpp
+++ /dev/null
@@ -1,160 +0,0 @@
-//===- SimplifyHalfPowrLibCalls.cpp - Optimize specific half_powr calls ---===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements a simple pass that applies an experimental
-// transformation on calls to specific functions.
-//
-//===----------------------------------------------------------------------===//
-
-#define DEBUG_TYPE "simplify-libcalls-halfpowr"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/Instructions.h"
-#include "llvm/Intrinsics.h"
-#include "llvm/Module.h"
-#include "llvm/Pass.h"
-#include "llvm/Transforms/Utils/BasicBlockUtils.h"
-#include "llvm/Transforms/Utils/Cloning.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/Support/Debug.h"
-using namespace llvm;
-
-namespace {
-  /// This pass optimizes well half_powr function calls.
-  ///
-  class SimplifyHalfPowrLibCalls : public FunctionPass {
-    const TargetData *TD;
-  public:
-    static char ID; // Pass identification
-    SimplifyHalfPowrLibCalls() : FunctionPass(ID) {
-      initializeSimplifyHalfPowrLibCallsPass(*PassRegistry::getPassRegistry());
-    }
-
-    bool runOnFunction(Function &F);
-
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-    }
-
-    Instruction *
-    InlineHalfPowrs(const std::vector<Instruction *> &HalfPowrs,
-                    Instruction *InsertPt);
-  };
-  char SimplifyHalfPowrLibCalls::ID = 0;
-} // end anonymous namespace.
-
-INITIALIZE_PASS(SimplifyHalfPowrLibCalls, "simplify-libcalls-halfpowr",
-                "Simplify half_powr library calls", false, false)
-
-// Public interface to the Simplify HalfPowr LibCalls pass.
-FunctionPass *llvm::createSimplifyHalfPowrLibCallsPass() {
-  return new SimplifyHalfPowrLibCalls(); 
-}
-
-/// InlineHalfPowrs - Inline a sequence of adjacent half_powr calls, rearranging
-/// their control flow to better facilitate subsequent optimization.
-Instruction *
-SimplifyHalfPowrLibCalls::
-InlineHalfPowrs(const std::vector<Instruction *> &HalfPowrs,
-                Instruction *InsertPt) {
-  std::vector<BasicBlock *> Bodies;
-  BasicBlock *NewBlock = 0;
-
-  for (unsigned i = 0, e = HalfPowrs.size(); i != e; ++i) {
-    CallInst *Call = cast<CallInst>(HalfPowrs[i]);
-    Function *Callee = Call->getCalledFunction();
-
-    // Minimally sanity-check the CFG of half_powr to ensure that it contains
-    // the kind of code we expect.  If we're running this pass, we have
-    // reason to believe it will be what we expect.
-    Function::iterator I = Callee->begin();
-    BasicBlock *Prologue = I++;
-    if (I == Callee->end()) break;
-    BasicBlock *SubnormalHandling = I++;
-    if (I == Callee->end()) break;
-    BasicBlock *Body = I++;
-    if (I != Callee->end()) break;
-    if (SubnormalHandling->getSinglePredecessor() != Prologue)
-      break;
-    BranchInst *PBI = dyn_cast<BranchInst>(Prologue->getTerminator());
-    if (!PBI || !PBI->isConditional())
-      break;
-    BranchInst *SNBI = dyn_cast<BranchInst>(SubnormalHandling->getTerminator());
-    if (!SNBI || SNBI->isConditional())
-      break;
-    if (!isa<ReturnInst>(Body->getTerminator()))
-      break;
-
-    Instruction *NextInst = llvm::next(BasicBlock::iterator(Call));
-
-    // Inline the call, taking care of what code ends up where.
-    NewBlock = SplitBlock(NextInst->getParent(), NextInst, this);
-
-    InlineFunctionInfo IFI(0, TD);
-    bool B = InlineFunction(Call, IFI);
-    assert(B && "half_powr didn't inline?");
-    (void)B;
-
-    BasicBlock *NewBody = NewBlock->getSinglePredecessor();
-    assert(NewBody);
-    Bodies.push_back(NewBody);
-  }
-
-  if (!NewBlock)
-    return InsertPt;
-
-  // Put the code for all the bodies into one block, to facilitate
-  // subsequent optimization.
-  (void)SplitEdge(NewBlock->getSinglePredecessor(), NewBlock, this);
-  for (unsigned i = 0, e = Bodies.size(); i != e; ++i) {
-    BasicBlock *Body = Bodies[i];
-    Instruction *FNP = Body->getFirstNonPHI();
-    // Splice the insts from body into NewBlock.
-    NewBlock->getInstList().splice(NewBlock->begin(), Body->getInstList(),
-                                   FNP, Body->getTerminator());
-  }
-
-  return NewBlock->begin();
-}
-
-/// runOnFunction - Top level algorithm.
-///
-bool SimplifyHalfPowrLibCalls::runOnFunction(Function &F) {
-  TD = getAnalysisIfAvailable<TargetData>();
-  
-  bool Changed = false;
-  std::vector<Instruction *> HalfPowrs;
-  for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
-    for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) {
-      // Look for calls.
-      bool IsHalfPowr = false;
-      if (CallInst *CI = dyn_cast<CallInst>(I)) {
-        // Look for direct calls and calls to non-external functions.
-        Function *Callee = CI->getCalledFunction();
-        if (Callee && Callee->hasExternalLinkage()) {
-          // Look for calls with well-known names.
-          if (Callee->getName() == "__half_powrf4")
-            IsHalfPowr = true;
-        }
-      }
-      if (IsHalfPowr)
-        HalfPowrs.push_back(I);
-      // We're looking for sequences of up to three such calls, which we'll
-      // simplify as a group.
-      if ((!IsHalfPowr && !HalfPowrs.empty()) || HalfPowrs.size() == 3) {
-        I = InlineHalfPowrs(HalfPowrs, I);
-        E = I->getParent()->end();
-        HalfPowrs.clear();
-        Changed = true;
-      }
-    }
-    assert(HalfPowrs.empty() && "Block had no terminator!");
-  }
-
-  return Changed;
-}