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Doxygen-ify comments.

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llvm-svn: 62546
This commit is contained in:
Bill Wendling 2009-01-19 23:43:56 +00:00
parent 7c2157602d
commit 5281f4fb64
1 changed files with 43 additions and 45 deletions
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88
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -74,11 +74,11 @@ static void AddPredecessorToBlock(BasicBlock *Succ, BasicBlock *NewPred,
PN->addIncoming(PN->getIncomingValueForBlock(ExistPred), NewPred);
}
// CanPropagatePredecessorsForPHIs - 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.
//
/// CanPropagatePredecessorsForPHIs - 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) {
assert(*succ_begin(BB) == Succ && "Succ is not successor of BB!");
@ -347,15 +347,15 @@ static Value *GetIfCondition(BasicBlock *BB,
}
// If we have a merge point of an "if condition" as accepted above, return true
// if the specified value dominates the block. We don't handle the true
// generality of domination here, just a special case which works well enough
// for us.
//
// If AggressiveInsts is non-null, and if V does not dominate BB, we check to
// see if V (which must be an instruction) is cheap to compute and is
// non-trapping. If both are true, the instruction is inserted into the set and
// true is returned.
/// DominatesMergePoint - If we have a merge point of an "if condition" as
/// accepted above, return true if the specified value dominates the block. We
/// don't handle the true generality of domination here, just a special case
/// which works well enough for us.
///
/// If AggressiveInsts is non-null, and if V does not dominate BB, we check to
/// see if V (which must be an instruction) is cheap to compute and is
/// non-trapping. If both are true, the instruction is inserted into the set
/// and true is returned.
static bool DominatesMergePoint(Value *V, BasicBlock *BB,
std::set<Instruction*> *AggressiveInsts) {
Instruction *I = dyn_cast<Instruction>(V);
@ -426,9 +426,9 @@ static bool DominatesMergePoint(Value *V, BasicBlock *BB,
return true;
}
// GatherConstantSetEQs - Given a potentially 'or'd together collection of
// icmp_eq instructions that compare a value against a constant, return the
// value being compared, and stick the constant into the Values vector.
/// GatherConstantSetEQs - Given a potentially 'or'd together collection of
/// icmp_eq instructions that compare a value against a constant, return the
/// value being compared, and stick the constant into the Values vector.
static Value *GatherConstantSetEQs(Value *V, std::vector<ConstantInt*> &Values){
if (Instruction *Inst = dyn_cast<Instruction>(V)) {
if (Inst->getOpcode() == Instruction::ICmp &&
@ -450,9 +450,9 @@ static Value *GatherConstantSetEQs(Value *V, std::vector<ConstantInt*> &Values){
return 0;
}
// GatherConstantSetNEs - Given a potentially 'and'd together collection of
// setne instructions that compare a value against a constant, return the value
// being compared, and stick the constant into the Values vector.
/// GatherConstantSetNEs - Given a potentially 'and'd together collection of
/// setne instructions that compare a value against a constant, return the value
/// being compared, and stick the constant into the Values vector.
static Value *GatherConstantSetNEs(Value *V, std::vector<ConstantInt*> &Values){
if (Instruction *Inst = dyn_cast<Instruction>(V)) {
if (Inst->getOpcode() == Instruction::ICmp &&
@ -474,8 +474,6 @@ static Value *GatherConstantSetNEs(Value *V, std::vector<ConstantInt*> &Values){
return 0;
}
/// GatherValueComparisons - If the specified Cond is an 'and' or 'or' of a
/// bunch of comparisons of one value against constants, return the value and
/// the constants being compared.
@ -532,8 +530,8 @@ static Value *isValueEqualityComparison(TerminatorInst *TI) {
return 0;
}
/// Given a value comparison instruction, decode all of the 'cases' that it
/// represents and return the 'default' block.
/// GetValueEqualityComparisonCases - Given a value comparison instruction,
/// decode all of the 'cases' that it represents and return the 'default' block.
static BasicBlock *
GetValueEqualityComparisonCases(TerminatorInst *TI,
std::vector<std::pair<ConstantInt*,
@ -554,8 +552,8 @@ GetValueEqualityComparisonCases(TerminatorInst *TI,
}
// EliminateBlockCases - Given a vector of bb/value pairs, remove any entries
// in the list that match the specified block.
/// EliminateBlockCases - Given a vector of bb/value pairs, remove any entries
/// in the list that match the specified block.
static void EliminateBlockCases(BasicBlock *BB,
std::vector<std::pair<ConstantInt*, BasicBlock*> > &Cases) {
for (unsigned i = 0, e = Cases.size(); i != e; ++i)
@ -565,8 +563,8 @@ static void EliminateBlockCases(BasicBlock *BB,
}
}
// ValuesOverlap - Return true if there are any keys in C1 that exist in C2 as
// well.
/// ValuesOverlap - Return true if there are any keys in C1 that exist in C2 as
/// well.
static bool
ValuesOverlap(std::vector<std::pair<ConstantInt*, BasicBlock*> > &C1,
std::vector<std::pair<ConstantInt*, BasicBlock*> > &C2) {
@ -600,12 +598,12 @@ ValuesOverlap(std::vector<std::pair<ConstantInt*, BasicBlock*> > &C1,
return false;
}
// SimplifyEqualityComparisonWithOnlyPredecessor - If TI is known to be a
// terminator instruction and its block is known to only have a single
// predecessor block, check to see if that predecessor is also a value
// comparison with the same value, and if that comparison determines the outcome
// of this comparison. If so, simplify TI. This does a very limited form of
// jump threading.
/// SimplifyEqualityComparisonWithOnlyPredecessor - If TI is known to be a
/// terminator instruction and its block is known to only have a single
/// predecessor block, check to see if that predecessor is also a value
/// comparison with the same value, and if that comparison determines the
/// outcome of this comparison. If so, simplify TI. This does a very limited
/// form of jump threading.
static bool SimplifyEqualityComparisonWithOnlyPredecessor(TerminatorInst *TI,
BasicBlock *Pred) {
Value *PredVal = isValueEqualityComparison(Pred->getTerminator());
@ -716,10 +714,10 @@ static bool SimplifyEqualityComparisonWithOnlyPredecessor(TerminatorInst *TI,
return false;
}
// FoldValueComparisonIntoPredecessors - The specified terminator is a value
// equality comparison instruction (either a switch or a branch on "X == c").
// See if any of the predecessors of the terminator block are value comparisons
// on the same value. If so, and if safe to do so, fold them together.
/// FoldValueComparisonIntoPredecessors - The specified terminator is a value
/// equality comparison instruction (either a switch or a branch on "X == c").
/// See if any of the predecessors of the terminator block are value comparisons
/// on the same value. If so, and if safe to do so, fold them together.
static bool FoldValueComparisonIntoPredecessors(TerminatorInst *TI) {
BasicBlock *BB = TI->getParent();
Value *CV = isValueEqualityComparison(TI); // CondVal
@ -1684,13 +1682,13 @@ namespace {
};
}
// SimplifyCFG - This function is used to do simplification of a CFG. For
// example, it adjusts branches to branches to eliminate the extra hop, it
// eliminates unreachable basic blocks, and does other "peephole" optimization
// of the CFG. It returns true if a modification was made.
//
// WARNING: The entry node of a function may not be simplified.
//
/// SimplifyCFG - This function is used to do simplification of a CFG. For
/// example, it adjusts branches to branches to eliminate the extra hop, it
/// eliminates unreachable basic blocks, and does other "peephole" optimization
/// of the CFG. It returns true if a modification was made.
///
/// WARNING: The entry node of a function may not be simplified.
///
bool llvm::SimplifyCFG(BasicBlock *BB) {
bool Changed = false;
Function *M = BB->getParent();