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[Utils] remove duplicated documentation comments; NFC 

http://llvm.org/docs/CodingStandards.html#doxygen-use-in-documentation-comments

llvm-svn: 367015
This commit is contained in:
Sanjay Patel 2019-07-25 13:11:21 +00:00
parent 447fe31964
commit 38a0200868
1 changed files with 4 additions and 29 deletions
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33
llvm/lib/Transforms/Utils/Local.cpp
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@ -639,17 +639,6 @@ bool llvm::SimplifyInstructionsInBlock(BasicBlock *BB,
// Control Flow Graph Restructuring.
//
/// RemovePredecessorAndSimplify - Like BasicBlock::removePredecessor, this
/// method is called when we're about to delete Pred as a predecessor of BB. If
/// BB contains any PHI nodes, this drops the entries in the PHI nodes for Pred.
///
/// Unlike the removePredecessor method, this attempts to simplify uses of PHI
/// nodes that collapse into identity values. For example, if we have:
/// x = phi(1, 0, 0, 0)
/// y = and x, z
///
/// .. and delete the predecessor corresponding to the '1', this will attempt to
/// recursively fold the and to 0.
void llvm::RemovePredecessorAndSimplify(BasicBlock *BB, BasicBlock *Pred,
DomTreeUpdater *DTU) {
// This only adjusts blocks with PHI nodes.
@ -678,10 +667,6 @@ void llvm::RemovePredecessorAndSimplify(BasicBlock *BB, BasicBlock *Pred,
DTU->applyUpdatesPermissive({{DominatorTree::Delete, Pred, BB}});
}
/// MergeBasicBlockIntoOnlyPred - DestBB is a block with one predecessor and its
/// predecessor is known to have one successor (DestBB!). Eliminate the edge
/// between them, moving the instructions in the predecessor into DestBB and
/// deleting the predecessor block.
void llvm::MergeBasicBlockIntoOnlyPred(BasicBlock *DestBB,
DomTreeUpdater *DTU) {
@ -761,15 +746,14 @@ void llvm::MergeBasicBlockIntoOnlyPred(BasicBlock *DestBB,
}
}
/// CanMergeValues - Return true if we can choose one of these values to use
/// in place of the other. Note that we will always choose the non-undef
/// value to keep.
/// Return true if we can choose one of these values to use in place of the
/// other. Note that we will always choose the non-undef value to keep.
static bool CanMergeValues(Value *First, Value *Second) {
return First == Second || isa<UndefValue>(First) || isa<UndefValue>(Second);
}
/// CanPropagatePredecessorsForPHIs - Return true if we can fold BB, an
/// almost-empty BB ending in an unconditional branch to Succ, into Succ.
/// Return true if we can fold BB, an almost-empty BB ending in an unconditional
/// branch to Succ, into Succ.
///
/// Assumption: Succ is the single successor for BB.
static bool CanPropagatePredecessorsForPHIs(BasicBlock *BB, BasicBlock *Succ) {
@ -962,11 +946,6 @@ static void redirectValuesFromPredecessorsToPhi(BasicBlock *BB,
replaceUndefValuesInPhi(PN, IncomingValues);
}
/// TryToSimplifyUncondBranchFromEmptyBlock - BB is known to contain an
/// unconditional branch, and contains no instructions other than PHI nodes,
/// potential side-effect free intrinsics and the branch. If possible,
/// eliminate BB by rewriting all the predecessors to branch to the successor
/// block and return true. If we can't transform, return false.
bool llvm::TryToSimplifyUncondBranchFromEmptyBlock(BasicBlock *BB,
DomTreeUpdater *DTU) {
assert(BB != &BB->getParent()->getEntryBlock() &&
@ -1094,10 +1073,6 @@ bool llvm::TryToSimplifyUncondBranchFromEmptyBlock(BasicBlock *BB,
return true;
}
/// EliminateDuplicatePHINodes - Check for and eliminate duplicate PHI
/// nodes in this block. This doesn't try to be clever about PHI nodes
/// which differ only in the order of the incoming values, but instcombine
/// orders them so it usually won't matter.
bool llvm::EliminateDuplicatePHINodes(BasicBlock *BB) {
// This implementation doesn't currently consider undef operands
// specially. Theoretically, two phis which are identical except for