From dce4a407a24b04eebc6a376f8e62b41aaa7b071f Mon Sep 17 00:00:00 2001 From: Stephen Hines Date: Thu, 29 May 2014 02:49:00 -0700 Subject: Update LLVM for 3.5 rebase (r209712). Change-Id: I149556c940fb7dc92d075273c87ff584f400941f --- lib/Transforms/Scalar/MemCpyOptimizer.cpp | 41 ++++++++++++++++--------------- 1 file changed, 21 insertions(+), 20 deletions(-) (limited to 'lib/Transforms/Scalar/MemCpyOptimizer.cpp') diff --git a/lib/Transforms/Scalar/MemCpyOptimizer.cpp b/lib/Transforms/Scalar/MemCpyOptimizer.cpp index 2603c96..b6bc792 100644 --- a/lib/Transforms/Scalar/MemCpyOptimizer.cpp +++ b/lib/Transforms/Scalar/MemCpyOptimizer.cpp @@ -12,7 +12,6 @@ // //===----------------------------------------------------------------------===// -#define DEBUG_TYPE "memcpyopt" #include "llvm/Transforms/Scalar.h" #include "llvm/ADT/SmallVector.h" #include "llvm/ADT/Statistic.h" @@ -33,6 +32,8 @@ #include using namespace llvm; +#define DEBUG_TYPE "memcpyopt" + STATISTIC(NumMemCpyInstr, "Number of memcpy instructions deleted"); STATISTIC(NumMemSetInfer, "Number of memsets inferred"); STATISTIC(NumMoveToCpy, "Number of memmoves converted to memcpy"); @@ -49,7 +50,7 @@ static int64_t GetOffsetFromIndex(const GEPOperator *GEP, unsigned Idx, int64_t Offset = 0; for (unsigned i = Idx, e = GEP->getNumOperands(); i != e; ++i, ++GTI) { ConstantInt *OpC = dyn_cast(GEP->getOperand(i)); - if (OpC == 0) + if (!OpC) return VariableIdxFound = true; if (OpC->isZero()) continue; // No offset. @@ -89,12 +90,12 @@ static bool IsPointerOffset(Value *Ptr1, Value *Ptr2, int64_t &Offset, // If one pointer is a GEP and the other isn't, then see if the GEP is a // constant offset from the base, as in "P" and "gep P, 1". - if (GEP1 && GEP2 == 0 && GEP1->getOperand(0)->stripPointerCasts() == Ptr2) { + if (GEP1 && !GEP2 && GEP1->getOperand(0)->stripPointerCasts() == Ptr2) { Offset = -GetOffsetFromIndex(GEP1, 1, VariableIdxFound, TD); return !VariableIdxFound; } - if (GEP2 && GEP1 == 0 && GEP2->getOperand(0)->stripPointerCasts() == Ptr1) { + if (GEP2 && !GEP1 && GEP2->getOperand(0)->stripPointerCasts() == Ptr1) { Offset = GetOffsetFromIndex(GEP2, 1, VariableIdxFound, TD); return !VariableIdxFound; } @@ -317,9 +318,9 @@ namespace { static char ID; // Pass identification, replacement for typeid MemCpyOpt() : FunctionPass(ID) { initializeMemCpyOptPass(*PassRegistry::getPassRegistry()); - MD = 0; - TLI = 0; - DL = 0; + MD = nullptr; + TLI = nullptr; + DL = nullptr; } bool runOnFunction(Function &F) override; @@ -373,7 +374,7 @@ INITIALIZE_PASS_END(MemCpyOpt, "memcpyopt", "MemCpy Optimization", /// attempts to merge them together into a memcpy/memset. Instruction *MemCpyOpt::tryMergingIntoMemset(Instruction *StartInst, Value *StartPtr, Value *ByteVal) { - if (DL == 0) return 0; + if (!DL) return nullptr; // Okay, so we now have a single store that can be splatable. Scan to find // all subsequent stores of the same value to offset from the same pointer. @@ -426,7 +427,7 @@ Instruction *MemCpyOpt::tryMergingIntoMemset(Instruction *StartInst, // If we have no ranges, then we just had a single store with nothing that // could be merged in. This is a very common case of course. if (Ranges.empty()) - return 0; + return nullptr; // If we had at least one store that could be merged in, add the starting // store as well. We try to avoid this unless there is at least something @@ -440,7 +441,7 @@ Instruction *MemCpyOpt::tryMergingIntoMemset(Instruction *StartInst, // Now that we have full information about ranges, loop over the ranges and // emit memset's for anything big enough to be worthwhile. - Instruction *AMemSet = 0; + Instruction *AMemSet = nullptr; for (MemsetRanges::const_iterator I = Ranges.begin(), E = Ranges.end(); I != E; ++I) { const MemsetRange &Range = *I; @@ -491,7 +492,7 @@ Instruction *MemCpyOpt::tryMergingIntoMemset(Instruction *StartInst, bool MemCpyOpt::processStore(StoreInst *SI, BasicBlock::iterator &BBI) { if (!SI->isSimple()) return false; - if (DL == 0) return false; + if (!DL) return false; // Detect cases where we're performing call slot forwarding, but // happen to be using a load-store pair to implement it, rather than @@ -500,7 +501,7 @@ bool MemCpyOpt::processStore(StoreInst *SI, BasicBlock::iterator &BBI) { if (LI->isSimple() && LI->hasOneUse() && LI->getParent() == SI->getParent()) { MemDepResult ldep = MD->getDependency(LI); - CallInst *C = 0; + CallInst *C = nullptr; if (ldep.isClobber() && !isa(ldep.getInst())) C = dyn_cast(ldep.getInst()); @@ -512,7 +513,7 @@ bool MemCpyOpt::processStore(StoreInst *SI, BasicBlock::iterator &BBI) { for (BasicBlock::iterator I = --BasicBlock::iterator(SI), E = C; I != E; --I) { if (AA.getModRefInfo(&*I, StoreLoc) != AliasAnalysis::NoModRef) { - C = 0; + C = nullptr; break; } } @@ -603,7 +604,7 @@ bool MemCpyOpt::performCallSlotOptzn(Instruction *cpy, return false; // Check that all of src is copied to dest. - if (DL == 0) return false; + if (!DL) return false; ConstantInt *srcArraySize = dyn_cast(srcAlloca->getArraySize()); if (!srcArraySize) @@ -846,7 +847,7 @@ bool MemCpyOpt::processMemCpy(MemCpyInst *M) { // The optimizations after this point require the memcpy size. ConstantInt *CopySize = dyn_cast(M->getLength()); - if (CopySize == 0) return false; + if (!CopySize) return false; // The are three possible optimizations we can do for memcpy: // a) memcpy-memcpy xform which exposes redundance for DSE. @@ -929,7 +930,7 @@ bool MemCpyOpt::processMemMove(MemMoveInst *M) { /// processByValArgument - This is called on every byval argument in call sites. bool MemCpyOpt::processByValArgument(CallSite CS, unsigned ArgNo) { - if (DL == 0) return false; + if (!DL) return false; // Find out what feeds this byval argument. Value *ByValArg = CS.getArgument(ArgNo); @@ -946,13 +947,13 @@ bool MemCpyOpt::processByValArgument(CallSite CS, unsigned ArgNo) { // a memcpy, see if we can byval from the source of the memcpy instead of the // result. MemCpyInst *MDep = dyn_cast(DepInfo.getInst()); - if (MDep == 0 || MDep->isVolatile() || + if (!MDep || MDep->isVolatile() || ByValArg->stripPointerCasts() != MDep->getDest()) return false; // The length of the memcpy must be larger or equal to the size of the byval. ConstantInt *C1 = dyn_cast(MDep->getLength()); - if (C1 == 0 || C1->getValue().getZExtValue() < ByValSize) + if (!C1 || C1->getValue().getZExtValue() < ByValSize) return false; // Get the alignment of the byval. If the call doesn't specify the alignment, @@ -1043,7 +1044,7 @@ bool MemCpyOpt::runOnFunction(Function &F) { bool MadeChange = false; MD = &getAnalysis(); DataLayoutPass *DLP = getAnalysisIfAvailable(); - DL = DLP ? &DLP->getDataLayout() : 0; + DL = DLP ? &DLP->getDataLayout() : nullptr; TLI = &getAnalysis(); // If we don't have at least memset and memcpy, there is little point of doing @@ -1058,6 +1059,6 @@ bool MemCpyOpt::runOnFunction(Function &F) { MadeChange = true; } - MD = 0; + MD = nullptr; return MadeChange; } -- cgit v1.1