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virtual interface on AliasAnalysis only deals with ModRef information. This interface was both computing memory locations by using TLI and other tricks to estimate the size of memory referenced by an operand, and computing ModRef information through similar investigations. This change narrows the scope of the virtual interface on AliasAnalysis slightly. Note that all of this code could live in BasicAA, and be done with a single investigation of the argument, if it weren't for the fact that the generic code in AliasAnalysis::getModRefBehavior for a callsite calls into the virtual aspect of (now) getArgModRefInfo. But this patch's arrangement seems a not terrible way to go for now. The other interesting wrinkle is how we could reasonably extend LLVM with support for custom memory location sizes and mod/ref behavior for library routines. After discussions with Hal on the review, the conclusion is that this would be best done by fleshing out the much desired support for extensions to TLI, and support these types of queries in that interface where we would likely be doing other library API recognition and analysis. Differential Revision: http://reviews.llvm.org/D10259 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239884 91177308-0d34-0410-b5e6-96231b3b80d8
175 lines
6.1 KiB
C++
175 lines
6.1 KiB
C++
//===- MemoryLocation.cpp - Memory location descriptions -------------------==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/MemoryLocation.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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using namespace llvm;
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MemoryLocation MemoryLocation::get(const LoadInst *LI) {
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AAMDNodes AATags;
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LI->getAAMetadata(AATags);
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const auto &DL = LI->getModule()->getDataLayout();
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return MemoryLocation(LI->getPointerOperand(),
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DL.getTypeStoreSize(LI->getType()), AATags);
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}
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MemoryLocation MemoryLocation::get(const StoreInst *SI) {
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AAMDNodes AATags;
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SI->getAAMetadata(AATags);
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const auto &DL = SI->getModule()->getDataLayout();
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return MemoryLocation(SI->getPointerOperand(),
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DL.getTypeStoreSize(SI->getValueOperand()->getType()),
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AATags);
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}
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MemoryLocation MemoryLocation::get(const VAArgInst *VI) {
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AAMDNodes AATags;
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VI->getAAMetadata(AATags);
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return MemoryLocation(VI->getPointerOperand(), UnknownSize, AATags);
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}
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MemoryLocation MemoryLocation::get(const AtomicCmpXchgInst *CXI) {
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AAMDNodes AATags;
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CXI->getAAMetadata(AATags);
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const auto &DL = CXI->getModule()->getDataLayout();
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return MemoryLocation(
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CXI->getPointerOperand(),
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DL.getTypeStoreSize(CXI->getCompareOperand()->getType()), AATags);
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}
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MemoryLocation MemoryLocation::get(const AtomicRMWInst *RMWI) {
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AAMDNodes AATags;
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RMWI->getAAMetadata(AATags);
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const auto &DL = RMWI->getModule()->getDataLayout();
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return MemoryLocation(RMWI->getPointerOperand(),
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DL.getTypeStoreSize(RMWI->getValOperand()->getType()),
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AATags);
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}
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MemoryLocation MemoryLocation::getForSource(const MemTransferInst *MTI) {
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uint64_t Size = UnknownSize;
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if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
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Size = C->getValue().getZExtValue();
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// memcpy/memmove can have AA tags. For memcpy, they apply
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// to both the source and the destination.
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AAMDNodes AATags;
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MTI->getAAMetadata(AATags);
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return MemoryLocation(MTI->getRawSource(), Size, AATags);
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}
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MemoryLocation MemoryLocation::getForDest(const MemIntrinsic *MTI) {
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uint64_t Size = UnknownSize;
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if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
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Size = C->getValue().getZExtValue();
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// memcpy/memmove can have AA tags. For memcpy, they apply
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// to both the source and the destination.
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AAMDNodes AATags;
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MTI->getAAMetadata(AATags);
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return MemoryLocation(MTI->getRawDest(), Size, AATags);
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}
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// FIXME: This code is duplicated with BasicAliasAnalysis and should be hoisted
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// to some common utility location.
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static bool isMemsetPattern16(const Function *MS,
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const TargetLibraryInfo &TLI) {
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if (TLI.has(LibFunc::memset_pattern16) &&
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MS->getName() == "memset_pattern16") {
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FunctionType *MemsetType = MS->getFunctionType();
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if (!MemsetType->isVarArg() && MemsetType->getNumParams() == 3 &&
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isa<PointerType>(MemsetType->getParamType(0)) &&
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isa<PointerType>(MemsetType->getParamType(1)) &&
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isa<IntegerType>(MemsetType->getParamType(2)))
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return true;
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}
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return false;
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}
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MemoryLocation MemoryLocation::getForArgument(ImmutableCallSite CS,
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unsigned ArgIdx,
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const TargetLibraryInfo &TLI) {
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AAMDNodes AATags;
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CS->getAAMetadata(AATags);
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const Value *Arg = CS.getArgument(ArgIdx);
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// We may be able to produce an exact size for known intrinsics.
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if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(CS.getInstruction())) {
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const DataLayout &DL = II->getModule()->getDataLayout();
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switch (II->getIntrinsicID()) {
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default:
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break;
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case Intrinsic::memset:
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case Intrinsic::memcpy:
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case Intrinsic::memmove:
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assert((ArgIdx == 0 || ArgIdx == 1) &&
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"Invalid argument index for memory intrinsic");
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if (ConstantInt *LenCI = dyn_cast<ConstantInt>(II->getArgOperand(2)))
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return MemoryLocation(Arg, LenCI->getZExtValue(), AATags);
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break;
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case Intrinsic::lifetime_start:
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case Intrinsic::lifetime_end:
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case Intrinsic::invariant_start:
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assert(ArgIdx == 1 && "Invalid argument index");
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return MemoryLocation(
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Arg, cast<ConstantInt>(II->getArgOperand(0))->getZExtValue(), AATags);
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case Intrinsic::invariant_end:
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assert(ArgIdx == 2 && "Invalid argument index");
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return MemoryLocation(
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Arg, cast<ConstantInt>(II->getArgOperand(1))->getZExtValue(), AATags);
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case Intrinsic::arm_neon_vld1:
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assert(ArgIdx == 0 && "Invalid argument index");
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// LLVM's vld1 and vst1 intrinsics currently only support a single
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// vector register.
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return MemoryLocation(Arg, DL.getTypeStoreSize(II->getType()), AATags);
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case Intrinsic::arm_neon_vst1:
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assert(ArgIdx == 0 && "Invalid argument index");
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return MemoryLocation(
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Arg, DL.getTypeStoreSize(II->getArgOperand(1)->getType()), AATags);
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}
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}
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// We can bound the aliasing properties of memset_pattern16 just as we can
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// for memcpy/memset. This is particularly important because the
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// LoopIdiomRecognizer likes to turn loops into calls to memset_pattern16
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// whenever possible.
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if (CS.getCalledFunction() &&
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isMemsetPattern16(CS.getCalledFunction(), TLI)) {
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assert((ArgIdx == 0 || ArgIdx == 1) &&
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"Invalid argument index for memset_pattern16");
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if (ArgIdx == 1)
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return MemoryLocation(Arg, 16, AATags);
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if (const ConstantInt *LenCI = dyn_cast<ConstantInt>(CS.getArgument(2)))
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return MemoryLocation(Arg, LenCI->getZExtValue(), AATags);
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}
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// FIXME: Handle memset_pattern4 and memset_pattern8 also.
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return MemoryLocation(CS.getArgument(ArgIdx), UnknownSize, AATags);
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}
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