#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ValueHandle.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
STATISTIC(NumThreads, "Number of jumps threaded");
JumpThreading() : FunctionPass(&ID) {}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.addRequired<TargetData>();
}
bool runOnFunction(Function &F);
/// runOnFunction - Top level algorithm.
///
bool JumpThreading::runOnFunction(Function &F) {
- DOUT << "Jump threading on function '" << F.getNameStart() << "'\n";
- TD = &getAnalysis<TargetData>();
+ DEBUG(errs() << "Jump threading on function '" << F.getName() << "'\n");
+ TD = getAnalysisIfAvailable<TargetData>();
FindLoopHeaders(F);
// edges which simplifies the CFG.
if (pred_begin(BB) == pred_end(BB) &&
BB != &BB->getParent()->getEntryBlock()) {
- DOUT << " JT: Deleting dead block '" << BB->getNameStart()
- << "' with terminator: " << *BB->getTerminator();
+ DEBUG(errs() << " JT: Deleting dead block '" << BB->getName()
+ << "' with terminator: " << *BB->getTerminator());
LoopHeaders.erase(BB);
DeleteDeadBlock(BB);
Changed = true;
if (CommonPreds.size() == 1)
return CommonPreds[0];
- DOUT << " Factoring out " << CommonPreds.size()
- << " common predecessors.\n";
+ DEBUG(errs() << " Factoring out " << CommonPreds.size()
+ << " common predecessors.\n");
return SplitBlockPredecessors(PN->getParent(),
&CommonPreds[0], CommonPreds.size(),
".thr_comm", this);
// terminator to an unconditional branch. This can occur due to threading in
// other blocks.
if (isa<ConstantInt>(Condition)) {
- DOUT << " In block '" << BB->getNameStart()
- << "' folding terminator: " << *BB->getTerminator();
+ DEBUG(errs() << " In block '" << BB->getName()
+ << "' folding terminator: " << *BB->getTerminator());
++NumFolds;
ConstantFoldTerminator(BB);
return true;
BBTerm->getSuccessor(i)->removePredecessor(BB);
}
- DOUT << " In block '" << BB->getNameStart()
- << "' folding undef terminator: " << *BBTerm;
+ DEBUG(errs() << " In block '" << BB->getName()
+ << "' folding undef terminator: " << *BBTerm);
BranchInst::Create(BBTerm->getSuccessor(MinSucc), BBTerm);
BBTerm->eraseFromParent();
return true;
else if (PredBI->getSuccessor(0) != BB)
BranchDir = false;
else {
- DOUT << " In block '" << PredBB->getNameStart()
- << "' folding terminator: " << *PredBB->getTerminator();
+ DEBUG(errs() << " In block '" << PredBB->getName()
+ << "' folding terminator: " << *PredBB->getTerminator());
++NumFolds;
ConstantFoldTerminator(PredBB);
return true;
// If the dest block has one predecessor, just fix the branch condition to a
// constant and fold it.
if (BB->getSinglePredecessor()) {
- DOUT << " In block '" << BB->getNameStart()
- << "' folding condition to '" << BranchDir << "': "
- << *BB->getTerminator();
+ DEBUG(errs() << " In block '" << BB->getName()
+ << "' folding condition to '" << BranchDir << "': "
+ << *BB->getTerminator());
++NumFolds;
- DestBI->setCondition(Context->getConstantInt(Type::Int1Ty, BranchDir));
+ DestBI->setCondition(ConstantInt::get(Type::Int1Ty, BranchDir));
ConstantFoldTerminator(BB);
return true;
}
// involves code duplication. Check to see if it is worth it.
unsigned JumpThreadCost = getJumpThreadDuplicationCost(BB);
if (JumpThreadCost > Threshold) {
- DOUT << " Not threading BB '" << BB->getNameStart()
- << "' - Cost is too high: " << JumpThreadCost << "\n";
+ DEBUG(errs() << " Not threading BB '" << BB->getName()
+ << "' - Cost is too high: " << JumpThreadCost << "\n");
return false;
}
// Otherwise, we're safe to make the change. Make sure that the edge from
// DestSI to DestSucc is not critical and has no PHI nodes.
- DOUT << "FORWARDING EDGE " << *DestVal << " FROM: " << *PredSI;
- DOUT << "THROUGH: " << *DestSI;
+ DEBUG(errs() << "FORWARDING EDGE " << *DestVal << " FROM: " << *PredSI);
+ DEBUG(errs() << "THROUGH: " << *DestSI);
// If the destination has PHI nodes, just split the edge for updating
// simplicity.
// If the returned value is the load itself, replace with an undef. This can
// only happen in dead loops.
- if (AvailableVal == LI) AvailableVal = Context->getUndef(LI->getType());
+ if (AvailableVal == LI) AvailableVal =
+ AvailableVal->getContext().getUndef(LI->getType());
LI->replaceAllUsesWith(AvailableVal);
LI->eraseFromParent();
return true;
BasicBlock *BB = PN->getParent();
unsigned JumpThreadCost = getJumpThreadDuplicationCost(BB);
if (JumpThreadCost > Threshold) {
- DOUT << " Not threading BB '" << BB->getNameStart()
- << "' - Cost is too high: " << JumpThreadCost << "\n";
+ DEBUG(errs() << " Not threading BB '" << BB->getName()
+ << "' - Cost is too high: " << JumpThreadCost << "\n");
return false;
}
// Next, figure out which successor we are threading to.
BasicBlock *SuccBB;
if (BranchInst *BI = dyn_cast<BranchInst>(BB->getTerminator()))
- SuccBB = BI->getSuccessor(PredCst == Context->getConstantIntFalse());
+ SuccBB = BI->getSuccessor(PredCst == PredBB->getContext().getFalse());
else {
SwitchInst *SI = cast<SwitchInst>(BB->getTerminator());
SuccBB = SI->getSuccessor(SI->findCaseValue(PredCst));
// We can only do the simplification for phi nodes of 'false' with AND or
// 'true' with OR. See if we have any entries in the phi for this.
unsigned PredNo = ~0U;
- ConstantInt *PredCst = Context->getConstantInt(Type::Int1Ty, !isAnd);
+ ConstantInt *PredCst = ConstantInt::get(Type::Int1Ty, !isAnd);
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) {
if (PN->getIncomingValue(i) == PredCst) {
PredNo = i;
// See if the cost of duplicating this block is low enough.
unsigned JumpThreadCost = getJumpThreadDuplicationCost(BB);
if (JumpThreadCost > Threshold) {
- DOUT << " Not threading BB '" << BB->getNameStart()
- << "' - Cost is too high: " << JumpThreadCost << "\n";
+ DEBUG(errs() << " Not threading BB '" << BB->getName()
+ << "' - Cost is too high: " << JumpThreadCost << "\n");
return false;
}
/// result can not be determined, a null pointer is returned.
static Constant *GetResultOfComparison(CmpInst::Predicate pred,
Value *LHS, Value *RHS,
- LLVMContext *Context) {
+ LLVMContext &Context) {
if (Constant *CLHS = dyn_cast<Constant>(LHS))
if (Constant *CRHS = dyn_cast<Constant>(RHS))
- return Context->getConstantExprCompare(pred, CLHS, CRHS);
+ return Context.getConstantExprCompare(pred, CLHS, CRHS);
if (LHS == RHS)
if (isa<IntegerType>(LHS->getType()) || isa<PointerType>(LHS->getType()))
return ICmpInst::isTrueWhenEqual(pred) ?
- Context->getConstantIntTrue() : Context->getConstantIntFalse();
+ Context.getTrue() : Context.getFalse();
return 0;
}
PredVal = PN->getIncomingValue(i);
Constant *Res = GetResultOfComparison(Cmp->getPredicate(), PredVal,
- RHS, Context);
+ RHS, Cmp->getContext());
if (!Res) {
PredVal = 0;
continue;
// See if the cost of duplicating this block is low enough.
unsigned JumpThreadCost = getJumpThreadDuplicationCost(BB);
if (JumpThreadCost > Threshold) {
- DOUT << " Not threading BB '" << BB->getNameStart()
- << "' - Cost is too high: " << JumpThreadCost << "\n";
+ DEBUG(errs() << " Not threading BB '" << BB->getName()
+ << "' - Cost is too high: " << JumpThreadCost << "\n");
return false;
}
// If threading to the same block as we come from, we would infinite loop.
if (SuccBB == BB) {
- DOUT << " Not threading across BB '" << BB->getNameStart()
- << "' - would thread to self!\n";
+ DEBUG(errs() << " Not threading across BB '" << BB->getName()
+ << "' - would thread to self!\n");
return false;
}
// If threading this would thread across a loop header, don't thread the edge.
// See the comments above FindLoopHeaders for justifications and caveats.
if (LoopHeaders.count(BB)) {
- DOUT << " Not threading from '" << PredBB->getNameStart()
- << "' across loop header BB '" << BB->getNameStart()
- << "' to dest BB '" << SuccBB->getNameStart()
- << "' - it might create an irreducible loop!\n";
+ DEBUG(errs() << " Not threading from '" << PredBB->getName()
+ << "' across loop header BB '" << BB->getName()
+ << "' to dest BB '" << SuccBB->getName()
+ << "' - it might create an irreducible loop!\n");
return false;
}
// And finally, do it!
- DOUT << " Threading edge from '" << PredBB->getNameStart() << "' to '"
- << SuccBB->getNameStart() << "' with cost: " << JumpThreadCost
- << ", across block:\n "
- << *BB << "\n";
+ DEBUG(errs() << " Threading edge from '" << PredBB->getName() << "' to '"
+ << SuccBB->getName() << "' with cost: " << JumpThreadCost
+ << ", across block:\n "
+ << *BB << "\n");
// Jump Threading can not update SSA properties correctly if the values
// defined in the duplicated block are used outside of the block itself. For
// Clone the non-phi instructions of BB into NewBB, keeping track of the
// mapping and using it to remap operands in the cloned instructions.
for (; !isa<TerminatorInst>(BI); ++BI) {
- Instruction *New = BI->clone(*Context);
- New->setName(BI->getNameStart());
+ Instruction *New = BI->clone(BI->getContext());
+ New->setName(BI->getName());
NewBB->getInstList().push_back(New);
ValueMapping[BI] = New;
projects / oota-llvm.git / blobdiff