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[CodeGenPrepare] Remove broken, dead, code.

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NFC.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232690 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Quentin Colombet 2015-03-18 23:17:28 +00:00
parent 64d662ba93
commit 3f503c807d
1 changed files with 6 additions and 26 deletions
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32
lib/CodeGen/CodeGenPrepare.cpp
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@ -124,7 +124,6 @@ class TypePromotionTransaction;
const TargetLowering *TLI;
const TargetTransformInfo *TTI;
const TargetLibraryInfo *TLInfo;
DominatorTree *DT;
/// CurInstIterator - As we scan instructions optimizing them, this is the
/// next instruction to optimize. Xforms that can invalidate this should
@ -142,8 +141,7 @@ class TypePromotionTransaction;
/// promotion for the current function.
InstrToOrigTy PromotedInsts;
/// ModifiedDT - If CFG is modified in anyway, dominator tree may need to
/// be updated.
/// ModifiedDT - If CFG is modified in anyway.
bool ModifiedDT;
/// OptSize - True if optimizing for size.
@ -214,9 +212,6 @@ bool CodeGenPrepare::runOnFunction(Function &F) {
TLI = TM->getSubtargetImpl(F)->getTargetLowering();
TLInfo = &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
TTI = &getAnalysis<TargetTransformInfoWrapperPass>().getTTI(F);
DominatorTreeWrapperPass *DTWP =
getAnalysisIfAvailable<DominatorTreeWrapperPass>();
DT = DTWP ? &DTWP->getDomTree() : nullptr;
OptSize = F.hasFnAttribute(Attribute::OptimizeForSize);
/// This optimization identifies DIV instructions that can be
@ -255,7 +250,6 @@ bool CodeGenPrepare::runOnFunction(Function &F) {
MadeChange |= OptimizeBlock(*BB, ModifiedDTOnIteration);
// Restart BB iteration if the dominator tree of the Function was changed
ModifiedDT |= ModifiedDTOnIteration;
if (ModifiedDTOnIteration)
break;
}
@ -298,8 +292,6 @@ bool CodeGenPrepare::runOnFunction(Function &F) {
if (EverMadeChange || MadeChange)
MadeChange |= EliminateFallThrough(F);
if (MadeChange)
ModifiedDT = true;
EverMadeChange |= MadeChange;
}
@ -313,9 +305,6 @@ bool CodeGenPrepare::runOnFunction(Function &F) {
EverMadeChange |= simplifyOffsetableRelocate(*I);
}
if (ModifiedDT && DT)
DT->recalculate(F);
return EverMadeChange;
}
@ -341,7 +330,7 @@ bool CodeGenPrepare::EliminateFallThrough(Function &F) {
// Remember if SinglePred was the entry block of the function.
// If so, we will need to move BB back to the entry position.
bool isEntry = SinglePred == &SinglePred->getParent()->getEntryBlock();
MergeBasicBlockIntoOnlyPred(BB, DT);
MergeBasicBlockIntoOnlyPred(BB, nullptr);
if (isEntry && BB != &BB->getParent()->getEntryBlock())
BB->moveBefore(&BB->getParent()->getEntryBlock());
@ -481,7 +470,7 @@ void CodeGenPrepare::EliminateMostlyEmptyBlock(BasicBlock *BB) {
// Remember if SinglePred was the entry block of the function. If so, we
// will need to move BB back to the entry position.
bool isEntry = SinglePred == &SinglePred->getParent()->getEntryBlock();
MergeBasicBlockIntoOnlyPred(DestBB, DT);
MergeBasicBlockIntoOnlyPred(DestBB, nullptr);
if (isEntry && BB != &BB->getParent()->getEntryBlock())
BB->moveBefore(&BB->getParent()->getEntryBlock());
@ -523,13 +512,6 @@ void CodeGenPrepare::EliminateMostlyEmptyBlock(BasicBlock *BB) {
// The PHIs are now updated, change everything that refers to BB to use
// DestBB and remove BB.
BB->replaceAllUsesWith(DestBB);
if (DT && !ModifiedDT) {
BasicBlock *BBIDom = DT->getNode(BB)->getIDom()->getBlock();
BasicBlock *DestBBIDom = DT->getNode(DestBB)->getIDom()->getBlock();
BasicBlock *NewIDom = DT->findNearestCommonDominator(BBIDom, DestBBIDom);
DT->changeImmediateDominator(DestBB, NewIDom);
DT->eraseNode(BB);
}
BB->eraseFromParent();
++NumBlocksElim;
@ -1280,7 +1262,7 @@ bool CodeGenPrepare::OptimizeCallInst(CallInst *CI, bool& ModifiedDT) {
WeakVH IterHandle(CurInstIterator);
replaceAndRecursivelySimplify(CI, RetVal,
TLInfo, ModifiedDT ? nullptr : DT);
TLInfo, nullptr);
// If the iterator instruction was recursively deleted, start over at the
// start of the block.
@ -4244,7 +4226,7 @@ bool CodeGenPrepare::OptimizeInst(Instruction *I, bool& ModifiedDT) {
// to introduce PHI nodes too late to be cleaned up. If we detect such a
// trivial PHI, go ahead and zap it here.
const DataLayout &DL = I->getModule()->getDataLayout();
if (Value *V = SimplifyInstruction(P, DL, TLInfo, DT)) {
if (Value *V = SimplifyInstruction(P, DL, TLInfo, nullptr)) {
P->replaceAllUsesWith(V);
P->eraseFromParent();
++NumPHIsElim;
@ -4674,10 +4656,8 @@ bool CodeGenPrepare::splitBranchCondition(Function &F) {
}
}
// Request DOM Tree update.
// Note: No point in getting fancy here, since the DT info is never
// available to CodeGenPrepare and the existing update code is broken
// anyways.
// available to CodeGenPrepare.
ModifiedDT = true;
MadeChange = true;