//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "loop-idiom"
#include "llvm/Transforms/Scalar.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Transforms/Utils/Local.h"
using namespace llvm;
+#define DEBUG_TYPE "loop-idiom"
+
STATISTIC(NumMemSet, "Number of memset's formed from loop stores");
STATISTIC(NumMemCpy, "Number of memcpy's formed from loop load+stores");
return dyn_cast<BranchInst>(BB->getTerminator());
}
- /// Return the condition of the branch terminating the given basic block.
- static Value *getBrCondtion(BasicBlock *);
-
/// Derive the precondition block (i.e the block that guards the loop
/// preheader) from the given preheader.
static BasicBlock *getPrecondBb(BasicBlock *PreHead);
/// the variable involved in the comparion is returned. This function will
/// be called to see if the precondition and postcondition of the loop
/// are in desirable form.
- Value *matchCondition (BranchInst *Br, BasicBlock *NonZeroTarget) const;
+ Value *matchCondition(BranchInst *Br, BasicBlock *NonZeroTarget) const;
/// Return true iff the idiom is detected in the loop. and 1) \p CntInst
- /// is set to the instruction counting the pupulation bit. 2) \p CntPhi
+ /// is set to the instruction counting the population bit. 2) \p CntPhi
/// is set to the corresponding phi node. 3) \p Var is set to the value
/// whose population bits are being counted.
bool detectIdiom
(Instruction *&CntInst, PHINode *&CntPhi, Value *&Var) const;
/// Insert ctpop intrinsic function and some obviously dead instructions.
- void transform (Instruction *CntInst, PHINode *CntPhi, Value *Var);
+ void transform(Instruction *CntInst, PHINode *CntPhi, Value *Var);
/// Create llvm.ctpop.* intrinsic function.
CallInst *createPopcntIntrinsic(IRBuilderTy &IRB, Value *Val, DebugLoc DL);
static char ID;
explicit LoopIdiomRecognize() : LoopPass(ID) {
initializeLoopIdiomRecognizePass(*PassRegistry::getPassRegistry());
- DL = 0; DT = 0; SE = 0; TLI = 0; TTI = 0;
+ DL = nullptr; DT = nullptr; SE = nullptr; TLI = nullptr; TTI = nullptr;
}
bool runOnLoop(Loop *L, LPPassManager &LPM) override;
if (DL)
return DL;
DataLayoutPass *DLP = getAnalysisIfAvailable<DataLayoutPass>();
- DL = DLP ? &DLP->getDataLayout() : 0;
+ DL = DLP ? &DLP->getDataLayout() : nullptr;
return DL;
}
for (unsigned op = 0, e = DeadInst->getNumOperands(); op != e; ++op) {
Value *Op = DeadInst->getOperand(op);
- DeadInst->setOperand(op, 0);
+ DeadInst->setOperand(op, nullptr);
// If this operand just became dead, add it to the NowDeadInsts list.
if (!Op->use_empty()) continue;
return false;
}
-Value *LIRUtil::getBrCondtion(BasicBlock *BB) {
- BranchInst *Br = getBranch(BB);
- return Br ? Br->getCondition() : 0;
-}
-
BasicBlock *LIRUtil::getPrecondBb(BasicBlock *PreHead) {
if (BasicBlock *BB = PreHead->getSinglePredecessor()) {
BranchInst *Br = getBranch(BB);
- return Br && Br->isConditional() ? BB : 0;
+ return Br && Br->isConditional() ? BB : nullptr;
}
- return 0;
+ return nullptr;
}
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
NclPopcountRecognize::NclPopcountRecognize(LoopIdiomRecognize &TheLIR):
- LIR(TheLIR), CurLoop(TheLIR.getLoop()), PreCondBB(0) {
+ LIR(TheLIR), CurLoop(TheLIR.getLoop()), PreCondBB(nullptr) {
}
bool NclPopcountRecognize::preliminaryScreen() {
return true;
}
-Value *NclPopcountRecognize::matchCondition (BranchInst *Br,
- BasicBlock *LoopEntry) const {
+Value *NclPopcountRecognize::matchCondition(BranchInst *Br,
+ BasicBlock *LoopEntry) const {
if (!Br || !Br->isConditional())
- return 0;
+ return nullptr;
ICmpInst *Cond = dyn_cast<ICmpInst>(Br->getCondition());
if (!Cond)
- return 0;
+ return nullptr;
ConstantInt *CmpZero = dyn_cast<ConstantInt>(Cond->getOperand(1));
if (!CmpZero || !CmpZero->isZero())
- return 0;
+ return nullptr;
ICmpInst::Predicate Pred = Cond->getPredicate();
if ((Pred == ICmpInst::ICMP_NE && Br->getSuccessor(0) == LoopEntry) ||
(Pred == ICmpInst::ICMP_EQ && Br->getSuccessor(1) == LoopEntry))
return Cond->getOperand(0);
- return 0;
+ return nullptr;
}
bool NclPopcountRecognize::detectIdiom(Instruction *&CntInst,
Value *VarX1, *VarX0;
PHINode *PhiX, *CountPhi;
- DefX2 = CountInst = 0;
- VarX1 = VarX0 = 0;
- PhiX = CountPhi = 0;
+ DefX2 = CountInst = nullptr;
+ VarX1 = VarX0 = nullptr;
+ PhiX = CountPhi = nullptr;
LoopEntry = *(CurLoop->block_begin());
// step 1: Check if the loop-back branch is in desirable form.
// step 4: Find the instruction which count the population: cnt2 = cnt1 + 1
{
- CountInst = NULL;
+ CountInst = nullptr;
for (BasicBlock::iterator Iter = LoopEntry->getFirstNonPHI(),
IterE = LoopEntry->end(); Iter != IterE; Iter++) {
Instruction *Inst = Iter;
// Check if the result of the instruction is live of the loop.
bool LiveOutLoop = false;
- for (Value::use_iterator I = Inst->use_begin(), E = Inst->use_end();
- I != E; I++) {
- if ((cast<Instruction>(*I))->getParent() != LoopEntry) {
+ for (User *U : Inst->users()) {
+ if ((cast<Instruction>(U))->getParent() != LoopEntry) {
LiveOutLoop = true; break;
}
}
// __builtin_ctpop().
{
SmallVector<Value *, 4> CntUses;
- for (Value::use_iterator I = CntInst->use_begin(), E = CntInst->use_end();
- I != E; I++) {
- if (cast<Instruction>(*I)->getParent() != Body)
- CntUses.push_back(*I);
- }
+ for (User *U : CntInst->users())
+ if (cast<Instruction>(U)->getParent() != Body)
+ CntUses.push_back(U);
for (unsigned Idx = 0; Idx < CntUses.size(); Idx++) {
(cast<Instruction>(CntUses[Idx]))->replaceUsesOfWith(CntInst, NewCount);
}
// If processing the store invalidated our iterator, start over from the
// top of the block.
- if (InstPtr == 0)
+ if (!InstPtr)
I = BB->begin();
continue;
}
// If processing the memset invalidated our iterator, start over from the
// top of the block.
- if (InstPtr == 0)
+ if (!InstPtr)
I = BB->begin();
continue;
}
// random store we can't handle.
const SCEVAddRecExpr *StoreEv =
dyn_cast<SCEVAddRecExpr>(SE->getSCEV(StorePtr));
- if (StoreEv == 0 || StoreEv->getLoop() != CurLoop || !StoreEv->isAffine())
+ if (!StoreEv || StoreEv->getLoop() != CurLoop || !StoreEv->isAffine())
return false;
// Check to see if the stride matches the size of the store. If so, then we
unsigned StoreSize = (unsigned)SizeInBits >> 3;
const SCEVConstant *Stride = dyn_cast<SCEVConstant>(StoreEv->getOperand(1));
- if (Stride == 0 || StoreSize != Stride->getValue()->getValue()) {
+ if (!Stride || StoreSize != Stride->getValue()->getValue()) {
// TODO: Could also handle negative stride here someday, that will require
// the validity check in mayLoopAccessLocation to be updated though.
// Enable this to print exact negative strides.
// loop, which indicates a strided store. If we have something else, it's a
// random store we can't handle.
const SCEVAddRecExpr *Ev = dyn_cast<SCEVAddRecExpr>(SE->getSCEV(Pointer));
- if (Ev == 0 || Ev->getLoop() != CurLoop || !Ev->isAffine())
+ if (!Ev || Ev->getLoop() != CurLoop || !Ev->isAffine())
return false;
// Reject memsets that are so large that they overflow an unsigned.
// TODO: Could also handle negative stride here someday, that will require the
// validity check in mayLoopAccessLocation to be updated though.
- if (Stride == 0 || MSI->getLength() != Stride->getValue())
+ if (!Stride || MSI->getLength() != Stride->getValue())
return false;
return processLoopStridedStore(Pointer, (unsigned)SizeInBytes,
// array. We could theoretically do a store to an alloca or something, but
// that doesn't seem worthwhile.
Constant *C = dyn_cast<Constant>(V);
- if (C == 0) return 0;
+ if (!C) return nullptr;
// Only handle simple values that are a power of two bytes in size.
uint64_t Size = DL.getTypeSizeInBits(V->getType());
if (Size == 0 || (Size & 7) || (Size & (Size-1)))
- return 0;
+ return nullptr;
// Don't care enough about darwin/ppc to implement this.
if (DL.isBigEndian())
- return 0;
+ return nullptr;
// Convert to size in bytes.
Size /= 8;
// TODO: If CI is larger than 16-bytes, we can try slicing it in half to see
// if the top and bottom are the same (e.g. for vectors and large integers).
- if (Size > 16) return 0;
+ if (Size > 16) return nullptr;
// If the constant is exactly 16 bytes, just use it.
if (Size == 16) return C;
// are stored. A store of i32 0x01020304 can never be turned into a memset,
// but it can be turned into memset_pattern if the target supports it.
Value *SplatValue = isBytewiseValue(StoredVal);
- Constant *PatternValue = 0;
+ Constant *PatternValue = nullptr;
unsigned DestAS = DestPtr->getType()->getPointerAddressSpace();
// promote the memset.
CurLoop->isLoopInvariant(SplatValue)) {
// Keep and use SplatValue.
- PatternValue = 0;
+ PatternValue = nullptr;
} else if (DestAS == 0 &&
TLI->has(LibFunc::memset_pattern16) &&
(PatternValue = getMemSetPatternValue(StoredVal, *DL))) {
// Don't create memset_pattern16s with address spaces.
// It looks like we can use PatternValue!
- SplatValue = 0;
+ SplatValue = nullptr;
} else {
// Otherwise, this isn't an idiom we can transform. For example, we can't
// do anything with a 3-byte store.
Int8PtrTy,
Int8PtrTy,
IntPtr,
- (void*)0);
+ (void*)nullptr);
// Otherwise we should form a memset_pattern16. PatternValue is known to be
// an constant array of 16-bytes. Plop the value into a mergable global.
projects / oota-llvm.git / blobdiff