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Standardize {pred,succ,use,user}_empty()

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The functions {pred,succ,use,user}_{begin,end} exist, but many users
have to check *_begin() with *_end() by hand to determine if the
BasicBlock or User is empty. Fix this with a standard *_empty(),
demonstrating a few usecases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225760 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ramkumar Ramachandra
2015-01-13 03:46:47 +00:00
parent 3423a7b24f
commit 2bcc808cf9
8 changed files with 18 additions and 10 deletions
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6
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -3020,7 +3020,7 @@ bool SimplifyCFGOpt::SimplifyReturn(ReturnInst *RI, IRBuilder<> &Builder) {
}
// If we eliminated all predecessors of the block, delete the block now.
if (pred_begin(BB) == pred_end(BB))
if (pred_empty(BB))
// We know there are no successors, so just nuke the block.
BB->eraseFromParent();
@ -3193,7 +3193,7 @@ bool SimplifyCFGOpt::SimplifyUnreachable(UnreachableInst *UI) {
}
// If this block is now dead, remove it.
if (pred_begin(BB) == pred_end(BB) &&
if (pred_empty(BB) &&
BB != &BB->getParent()->getEntryBlock()) {
// We know there are no successors, so just nuke the block.
BB->eraseFromParent();
@ -4587,7 +4587,7 @@ bool SimplifyCFGOpt::run(BasicBlock *BB) {
// Remove basic blocks that have no predecessors (except the entry block)...
// or that just have themself as a predecessor. These are unreachable.
if ((pred_begin(BB) == pred_end(BB) &&
if ((pred_emtpy(BB) &&
BB != &BB->getParent()->getEntryBlock()) ||
BB->getSinglePredecessor() == BB) {
DEBUG(dbgs() << "Removing BB: \n" << *BB);