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remove the dead (and terrible) llvm::RemoveSuccessor function.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121753 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-12-14 06:51:55 +00:00
parent 302ba6fc1c
commit 2112bbc42d
2 changed files with 0 additions and 55 deletions
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9
include/llvm/Transforms/Utils/BasicBlockUtils.h
View File

@ -75,15 +75,6 @@ void FindFunctionBackedges(const Function &F,
SmallVectorImpl<std::pair<const BasicBlock*,const BasicBlock*> > &Result);
// RemoveSuccessor - Change the specified terminator instruction such that its
// successor #SuccNum no longer exists. Because this reduces the outgoing
// degree of the current basic block, the actual terminator instruction itself
// may have to be changed. In the case where the last successor of the block is
// deleted, a return instruction is inserted in its place which can cause a
// suprising change in program behavior if it is not expected.
//
void RemoveSuccessor(TerminatorInst *TI, unsigned SuccNum);
/// GetSuccessorNumber - Search for the specified successor of basic block BB
/// and return its position in the terminator instruction's list of
/// successors. It is an error to call this with a block that is not a

46
lib/Transforms/Utils/BasicBlockUtils.cpp
View File

@ -218,52 +218,6 @@ void llvm::ReplaceInstWithInst(Instruction *From, Instruction *To) {
ReplaceInstWithInst(From->getParent()->getInstList(), BI, To);
}
/// RemoveSuccessor - Change the specified terminator instruction such that its
/// successor SuccNum no longer exists. Because this reduces the outgoing
/// degree of the current basic block, the actual terminator instruction itself
/// may have to be changed. In the case where the last successor of the block
/// is deleted, a return instruction is inserted in its place which can cause a
/// surprising change in program behavior if it is not expected.
///
void llvm::RemoveSuccessor(TerminatorInst *TI, unsigned SuccNum) {
assert(SuccNum < TI->getNumSuccessors() &&
"Trying to remove a nonexistant successor!");
// If our old successor block contains any PHI nodes, remove the entry in the
// PHI nodes that comes from this branch...
//
BasicBlock *BB = TI->getParent();
TI->getSuccessor(SuccNum)->removePredecessor(BB);
TerminatorInst *NewTI = 0;
switch (TI->getOpcode()) {
case Instruction::Br:
// If this is a conditional branch... convert to unconditional branch.
if (TI->getNumSuccessors() == 2) {
cast<BranchInst>(TI)->setUnconditionalDest(TI->getSuccessor(1-SuccNum));
} else { // Otherwise convert to a return instruction...
Value *RetVal = 0;
// Create a value to return... if the function doesn't return null...
if (!BB->getParent()->getReturnType()->isVoidTy())
RetVal = Constant::getNullValue(BB->getParent()->getReturnType());
// Create the return...
NewTI = ReturnInst::Create(TI->getContext(), RetVal);
}
break;
case Instruction::Invoke: // Should convert to call
case Instruction::Switch: // Should remove entry
default:
case Instruction::Ret: // Cannot happen, has no successors!
llvm_unreachable("Unhandled terminator inst type in RemoveSuccessor!");
}
if (NewTI) // If it's a different instruction, replace.
ReplaceInstWithInst(TI, NewTI);
}
/// GetSuccessorNumber - Search for the specified successor of basic block BB
/// and return its position in the terminator instruction's list of
/// successors. It is an error to call this with a block that is not a