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276 lines
9.8 KiB
C++
276 lines
9.8 KiB
C++
//===- MemoryLocation.cpp - Memory location descriptions -------------------==//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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/IntrinsicsARM.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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void LocationSize::print(raw_ostream &OS) const {
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OS << "LocationSize::";
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if (*this == beforeOrAfterPointer())
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OS << "beforeOrAfterPointer";
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else if (*this == afterPointer())
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OS << "afterPointer";
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else if (*this == mapEmpty())
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OS << "mapEmpty";
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else if (*this == mapTombstone())
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OS << "mapTombstone";
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else if (isPrecise())
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OS << "precise(" << getValue() << ')';
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else
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OS << "upperBound(" << getValue() << ')';
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}
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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(
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LI->getPointerOperand(),
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LocationSize::precise(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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LocationSize::precise(DL.getTypeStoreSize(
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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(),
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LocationSize::afterPointer(), 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(CXI->getPointerOperand(),
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LocationSize::precise(DL.getTypeStoreSize(
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CXI->getCompareOperand()->getType())),
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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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LocationSize::precise(DL.getTypeStoreSize(
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RMWI->getValOperand()->getType())),
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AATags);
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}
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Optional<MemoryLocation> MemoryLocation::getOrNone(const Instruction *Inst) {
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switch (Inst->getOpcode()) {
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case Instruction::Load:
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return get(cast<LoadInst>(Inst));
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case Instruction::Store:
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return get(cast<StoreInst>(Inst));
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case Instruction::VAArg:
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return get(cast<VAArgInst>(Inst));
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case Instruction::AtomicCmpXchg:
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return get(cast<AtomicCmpXchgInst>(Inst));
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case Instruction::AtomicRMW:
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return get(cast<AtomicRMWInst>(Inst));
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default:
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return None;
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}
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}
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MemoryLocation MemoryLocation::getForSource(const MemTransferInst *MTI) {
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return getForSource(cast<AnyMemTransferInst>(MTI));
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}
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MemoryLocation MemoryLocation::getForSource(const AtomicMemTransferInst *MTI) {
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return getForSource(cast<AnyMemTransferInst>(MTI));
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}
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MemoryLocation MemoryLocation::getForSource(const AnyMemTransferInst *MTI) {
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auto Size = LocationSize::afterPointer();
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if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
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Size = LocationSize::precise(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 *MI) {
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return getForDest(cast<AnyMemIntrinsic>(MI));
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}
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MemoryLocation MemoryLocation::getForDest(const AtomicMemIntrinsic *MI) {
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return getForDest(cast<AnyMemIntrinsic>(MI));
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}
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MemoryLocation MemoryLocation::getForDest(const AnyMemIntrinsic *MI) {
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auto Size = LocationSize::afterPointer();
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if (ConstantInt *C = dyn_cast<ConstantInt>(MI->getLength()))
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Size = LocationSize::precise(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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MI->getAAMetadata(AATags);
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return MemoryLocation(MI->getRawDest(), Size, AATags);
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}
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MemoryLocation MemoryLocation::getForArgument(const CallBase *Call,
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unsigned ArgIdx,
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const TargetLibraryInfo *TLI) {
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AAMDNodes AATags;
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Call->getAAMetadata(AATags);
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const Value *Arg = Call->getArgOperand(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>(Call)) {
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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::memcpy_inline:
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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, LocationSize::precise(LenCI->getZExtValue()),
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AATags);
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return MemoryLocation::getAfter(Arg, AATags);
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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,
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LocationSize::precise(
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cast<ConstantInt>(II->getArgOperand(0))->getZExtValue()),
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AATags);
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case Intrinsic::masked_load:
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assert(ArgIdx == 0 && "Invalid argument index");
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return MemoryLocation(
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Arg,
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LocationSize::upperBound(DL.getTypeStoreSize(II->getType())),
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AATags);
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case Intrinsic::masked_store:
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assert(ArgIdx == 1 && "Invalid argument index");
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return MemoryLocation(
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Arg,
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LocationSize::upperBound(
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DL.getTypeStoreSize(II->getArgOperand(0)->getType())),
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AATags);
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case Intrinsic::invariant_end:
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// The first argument to an invariant.end is a "descriptor" type (e.g. a
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// pointer to a empty struct) which is never actually dereferenced.
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if (ArgIdx == 0)
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return MemoryLocation(Arg, LocationSize::precise(0), AATags);
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assert(ArgIdx == 2 && "Invalid argument index");
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return MemoryLocation(
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Arg,
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LocationSize::precise(
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cast<ConstantInt>(II->getArgOperand(1))->getZExtValue()),
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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(
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Arg, LocationSize::precise(DL.getTypeStoreSize(II->getType())),
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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(Arg,
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LocationSize::precise(DL.getTypeStoreSize(
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II->getArgOperand(1)->getType())),
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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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LibFunc F;
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if (TLI && TLI->getLibFunc(*Call, F) && TLI->has(F)) {
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switch (F) {
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case LibFunc_memset_pattern16:
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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, LocationSize::precise(16), AATags);
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if (const ConstantInt *LenCI =
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dyn_cast<ConstantInt>(Call->getArgOperand(2)))
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return MemoryLocation(Arg, LocationSize::precise(LenCI->getZExtValue()),
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AATags);
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return MemoryLocation::getAfter(Arg, AATags);
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case LibFunc_bcmp:
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case LibFunc_memcmp:
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assert((ArgIdx == 0 || ArgIdx == 1) &&
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"Invalid argument index for memcmp/bcmp");
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if (const ConstantInt *LenCI =
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dyn_cast<ConstantInt>(Call->getArgOperand(2)))
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return MemoryLocation(Arg, LocationSize::precise(LenCI->getZExtValue()),
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AATags);
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return MemoryLocation::getAfter(Arg, AATags);
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case LibFunc_memchr:
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assert((ArgIdx == 0) && "Invalid argument index for memchr");
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if (const ConstantInt *LenCI =
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dyn_cast<ConstantInt>(Call->getArgOperand(2)))
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return MemoryLocation(Arg, LocationSize::precise(LenCI->getZExtValue()),
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AATags);
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return MemoryLocation::getAfter(Arg, AATags);
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case LibFunc_memccpy:
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assert((ArgIdx == 0 || ArgIdx == 1) &&
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"Invalid argument index for memccpy");
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// We only know an upper bound on the number of bytes read/written.
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if (const ConstantInt *LenCI =
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dyn_cast<ConstantInt>(Call->getArgOperand(3)))
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return MemoryLocation(
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Arg, LocationSize::upperBound(LenCI->getZExtValue()), AATags);
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return MemoryLocation::getAfter(Arg, AATags);
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default:
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break;
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};
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}
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// FIXME: Handle memset_pattern4 and memset_pattern8 also.
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return MemoryLocation::getBeforeOrAfter(Call->getArgOperand(ArgIdx), AATags);
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}
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