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Refactor to share code to find the position of a basic block successor in the

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terminator's list of successors.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96377 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2010-02-16 19:49:17 +00:00
parent 7fca2294da
commit adb6f22671
3 changed files with 23 additions and 19 deletions
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28
lib/Transforms/Utils/BasicBlockUtils.cpp
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@ -274,24 +274,30 @@ void llvm::RemoveSuccessor(TerminatorInst *TI, unsigned SuccNum) {
ReplaceInstWithInst(TI, NewTI);
}
/// SplitEdge - Split the edge connecting specified block. Pass P must
/// not be NULL.
BasicBlock *llvm::SplitEdge(BasicBlock *BB, BasicBlock *Succ, Pass *P) {
TerminatorInst *LatchTerm = BB->getTerminator();
unsigned SuccNum = 0;
/// SuccessorNumber - 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 successor.
unsigned llvm::SuccessorNumber(BasicBlock *BB, BasicBlock *Succ) {
TerminatorInst *Term = BB->getTerminator();
#ifndef NDEBUG
unsigned e = LatchTerm->getNumSuccessors();
unsigned e = Term->getNumSuccessors();
#endif
for (unsigned i = 0; ; ++i) {
assert(i != e && "Didn't find edge?");
if (LatchTerm->getSuccessor(i) == Succ) {
SuccNum = i;
break;
}
if (Term->getSuccessor(i) == Succ)
return i;
}
return 0;
}
/// SplitEdge - Split the edge connecting specified block. Pass P must
/// not be NULL.
BasicBlock *llvm::SplitEdge(BasicBlock *BB, BasicBlock *Succ, Pass *P) {
unsigned SuccNum = SuccessorNumber(BB, Succ);
// If this is a critical edge, let SplitCriticalEdge do it.
if (SplitCriticalEdge(BB->getTerminator(), SuccNum, P))
TerminatorInst *LatchTerm = BB->getTerminator();
if (SplitCriticalEdge(LatchTerm, SuccNum, P))
return LatchTerm->getSuccessor(SuccNum);
// If the edge isn't critical, then BB has a single successor or Succ has a