const DataLayout &DL, LoopInfo *LI = nullptr,
unsigned MaxLookup = 6);
+ /// This is a wrapper around GetUnderlyingObjects and adds support for basic
+ /// ptrtoint+arithmetic+inttoptr sequences.
+ void getUnderlyingObjectsForCodeGen(const Value *V,
+ SmallVectorImpl<Value *> &Objects,
+ const DataLayout &DL);
+
/// Return true if the only users of this pointer are lifetime markers.
bool onlyUsedByLifetimeMarkers(const Value *V);
MachineMemOperand *getMachineMemOperand(const MachineMemOperand *MMO,
int64_t Offset, uint64_t Size);
+ /// Allocate a new MachineMemOperand by copying an existing one,
+ /// replacing only AliasAnalysis information. MachineMemOperands are owned
+ /// by the MachineFunction and need not be explicitly deallocated.
+ MachineMemOperand *getMachineMemOperand(const MachineMemOperand *MMO,
+ const AAMDNodes &AAInfo);
+
using OperandCapacity = ArrayRecycler<MachineOperand>::Capacity;
/// Allocate an array of MachineOperands. This is only intended for use by
return NumMemRefs == 1;
}
+ /// Return the number of memory operands.
+ unsigned getNumMemOperands() const { return NumMemRefs; }
+
/// API for querying MachineInstr properties. They are the same as MCInstrDesc
/// queries but they are bundle aware.
} while (!Worklist.empty());
}
+/// This is the function that does the work of looking through basic
+/// ptrtoint+arithmetic+inttoptr sequences.
+static const Value *getUnderlyingObjectFromInt(const Value *V) {
+ do {
+ if (const Operator *U = dyn_cast<Operator>(V)) {
+ // If we find a ptrtoint, we can transfer control back to the
+ // regular getUnderlyingObjectFromInt.
+ if (U->getOpcode() == Instruction::PtrToInt)
+ return U->getOperand(0);
+ // If we find an add of a constant, a multiplied value, or a phi, it's
+ // likely that the other operand will lead us to the base
+ // object. We don't have to worry about the case where the
+ // object address is somehow being computed by the multiply,
+ // because our callers only care when the result is an
+ // identifiable object.
+ if (U->getOpcode() != Instruction::Add ||
+ (!isa<ConstantInt>(U->getOperand(1)) &&
+ Operator::getOpcode(U->getOperand(1)) != Instruction::Mul &&
+ !isa<PHINode>(U->getOperand(1))))
+ return V;
+ V = U->getOperand(0);
+ } else {
+ return V;
+ }
+ assert(V->getType()->isIntegerTy() && "Unexpected operand type!");
+ } while (true);
+}
+
+/// This is a wrapper around GetUnderlyingObjects and adds support for basic
+/// ptrtoint+arithmetic+inttoptr sequences.
+void llvm::getUnderlyingObjectsForCodeGen(const Value *V,
+ SmallVectorImpl<Value *> &Objects,
+ const DataLayout &DL) {
+ SmallPtrSet<const Value *, 16> Visited;
+ SmallVector<const Value *, 4> Working(1, V);
+ do {
+ V = Working.pop_back_val();
+
+ SmallVector<Value *, 4> Objs;
+ GetUnderlyingObjects(const_cast<Value *>(V), Objs, DL);
+
+ for (Value *V : Objs) {
+ // If GetUnderlyingObjects fails to find an identifiable object,
+ // getUnderlyingObjectsForCodeGen also fails for safety.
+ if (!isIdentifiedObject(V)) {
+ Objects.clear();
+ return;
+ }
+
+ if (!Visited.insert(V).second)
+ continue;
+ if (Operator::getOpcode(V) == Instruction::IntToPtr) {
+ const Value *O =
+ getUnderlyingObjectFromInt(cast<User>(V)->getOperand(0));
+ if (O->getType()->isPointerTy()) {
+ Working.push_back(O);
+ continue;
+ }
+ }
+ Objects.push_back(const_cast<Value *>(V));
+ }
+ } while (!Working.empty());
+}
+
/// Return true if the only users of this pointer are lifetime markers.
bool llvm::onlyUsedByLifetimeMarkers(const Value *V) {
for (const User *U : V->users()) {
MMO->getOrdering(), MMO->getFailureOrdering());
}
+MachineMemOperand *
+MachineFunction::getMachineMemOperand(const MachineMemOperand *MMO,
+ const AAMDNodes &AAInfo) {
+ MachinePointerInfo MPI = MMO->getValue() ?
+ MachinePointerInfo(MMO->getValue(), MMO->getOffset()) :
+ MachinePointerInfo(MMO->getPseudoValue(), MMO->getOffset());
+
+ return new (Allocator)
+ MachineMemOperand(MPI, MMO->getFlags(), MMO->getSize(),
+ MMO->getBaseAlignment(), AAInfo,
+ MMO->getRanges(), MMO->getSyncScopeID(),
+ MMO->getOrdering(), MMO->getFailureOrdering());
+}
+
MachineInstr::mmo_iterator
MachineFunction::allocateMemRefsArray(unsigned long Num) {
return Allocator.Allocate<MachineMemOperand *>(Num);
SchedModel.init(ST.getSchedModel(), &ST, TII);
}
-/// This is the function that does the work of looking through basic
-/// ptrtoint+arithmetic+inttoptr sequences.
-static const Value *getUnderlyingObjectFromInt(const Value *V) {
- do {
- if (const Operator *U = dyn_cast<Operator>(V)) {
- // If we find a ptrtoint, we can transfer control back to the
- // regular getUnderlyingObjectFromInt.
- if (U->getOpcode() == Instruction::PtrToInt)
- return U->getOperand(0);
- // If we find an add of a constant, a multiplied value, or a phi, it's
- // likely that the other operand will lead us to the base
- // object. We don't have to worry about the case where the
- // object address is somehow being computed by the multiply,
- // because our callers only care when the result is an
- // identifiable object.
- if (U->getOpcode() != Instruction::Add ||
- (!isa<ConstantInt>(U->getOperand(1)) &&
- Operator::getOpcode(U->getOperand(1)) != Instruction::Mul &&
- !isa<PHINode>(U->getOperand(1))))
- return V;
- V = U->getOperand(0);
- } else {
- return V;
- }
- assert(V->getType()->isIntegerTy() && "Unexpected operand type!");
- } while (true);
-}
-
-/// This is a wrapper around GetUnderlyingObjects and adds support for basic
-/// ptrtoint+arithmetic+inttoptr sequences.
-static void getUnderlyingObjects(const Value *V,
- SmallVectorImpl<Value *> &Objects,
- const DataLayout &DL) {
- SmallPtrSet<const Value *, 16> Visited;
- SmallVector<const Value *, 4> Working(1, V);
- do {
- V = Working.pop_back_val();
-
- SmallVector<Value *, 4> Objs;
- GetUnderlyingObjects(const_cast<Value *>(V), Objs, DL);
-
- for (Value *V : Objs) {
- if (!Visited.insert(V).second)
- continue;
- if (Operator::getOpcode(V) == Instruction::IntToPtr) {
- const Value *O =
- getUnderlyingObjectFromInt(cast<User>(V)->getOperand(0));
- if (O->getType()->isPointerTy()) {
- Working.push_back(O);
- continue;
- }
- }
- Objects.push_back(const_cast<Value *>(V));
- }
- } while (!Working.empty());
-}
-
/// If this machine instr has memory reference information and it can be tracked
/// to a normal reference to a known object, return the Value for that object.
static void getUnderlyingObjectsForInstr(const MachineInstr *MI,
Objects.push_back(UnderlyingObjectsVector::value_type(PSV, MayAlias));
} else if (const Value *V = MMO->getValue()) {
SmallVector<Value *, 4> Objs;
- getUnderlyingObjects(V, Objs, DL);
+ getUnderlyingObjectsForCodeGen(V, Objs, DL);
for (Value *V : Objs) {
- if (!isIdentifiedObject(V))
- return false;
-
+ assert(isIdentifiedObject(V));
Objects.push_back(UnderlyingObjectsVector::value_type(V, true));
}
} else
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
+#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/CodeGen/SlotIndexes.h"
#include "llvm/CodeGen/StackProtector.h"
#include "llvm/CodeGen/WinEHFuncInfo.h"
// Keep a list of *allocas* which need to be remapped.
DenseMap<const AllocaInst*, const AllocaInst*> Allocas;
+
+ // Keep a list of allocas which has been affected by the remap.
+ SmallPtrSet<const AllocaInst*, 32> MergedAllocas;
+
for (const std::pair<int, int> &SI : SlotRemap) {
const AllocaInst *From = MFI->getObjectAllocation(SI.first);
const AllocaInst *To = MFI->getObjectAllocation(SI.second);
Inst = Cast;
}
+ // We keep both slots to maintain AliasAnalysis metadata later.
+ MergedAllocas.insert(From);
+ MergedAllocas.insert(To);
+
// Allow the stack protector to adjust its value map to account for the
// upcoming replacement.
SP->adjustForColoring(From, To);
// Update the MachineMemOperand to use the new alloca.
for (MachineMemOperand *MMO : I.memoperands()) {
- // FIXME: In order to enable the use of TBAA when using AA in CodeGen,
- // we'll also need to update the TBAA nodes in MMOs with values
- // derived from the merged allocas. When doing this, we'll need to use
- // the same variant of GetUnderlyingObjects that is used by the
- // instruction scheduler (that can look through ptrtoint/inttoptr
- // pairs).
-
// We've replaced IR-level uses of the remapped allocas, so we only
// need to replace direct uses here.
const AllocaInst *AI = dyn_cast_or_null<AllocaInst>(MMO->getValue());
MO.setIndex(ToSlot);
FixedInstr++;
}
+
+ // We adjust AliasAnalysis information for merged stack slots.
+ MachineSDNode::mmo_iterator MemOps =
+ MF->allocateMemRefsArray(I.getNumMemOperands());
+ unsigned MemOpIdx = 0;
+ bool ReplaceMemOps = false;
+ for (MachineMemOperand *MMO : I.memoperands()) {
+ // If this memory location can be a slot remapped here,
+ // we remove AA information.
+ bool MayHaveConflictingAAMD = false;
+ if (MMO->getAAInfo()) {
+ if (const Value *MMOV = MMO->getValue()) {
+ SmallVector<Value *, 4> Objs;
+ getUnderlyingObjectsForCodeGen(MMOV, Objs, MF->getDataLayout());
+
+ if (Objs.empty())
+ MayHaveConflictingAAMD = true;
+ else
+ for (Value *V : Objs) {
+ // If this memory location comes from a known stack slot
+ // that is not remapped, we continue checking.
+ // Otherwise, we need to invalidate AA infomation.
+ const AllocaInst *AI = dyn_cast_or_null<AllocaInst>(V);
+ if (AI && MergedAllocas.count(AI)) {
+ MayHaveConflictingAAMD = true;
+ break;
+ }
+ }
+ }
+ }
+ if (MayHaveConflictingAAMD) {
+ MemOps[MemOpIdx++] = MF->getMachineMemOperand(MMO, AAMDNodes());
+ ReplaceMemOps = true;
+ }
+ else
+ MemOps[MemOpIdx++] = MMO;
+ }
+
+ // If any memory operand is updated, set memory references of
+ // this instruction.
+ if (ReplaceMemOps)
+ I.setMemRefs(std::make_pair(MemOps, I.getNumMemOperands()));
}
// Update the location of C++ catch objects for the MSVC personality routine.
projects / llvm / commitdiff