#include "llvm/Transforms/Utils/PromoteMemToReg.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/IRBuilder.h"
#include "llvm/Support/MathExtras.h"
-#include "llvm/Support/Compiler.h"
+#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
-#include "llvm/ADT/StringExtras.h"
using namespace llvm;
STATISTIC(NumReplaced, "Number of allocas broken up");
STATISTIC(NumGlobals, "Number of allocas copied from constant global");
namespace {
- struct VISIBILITY_HIDDEN SROA : public FunctionPass {
+ struct SROA : public FunctionPass {
static char ID; // Pass identification, replacement for typeid
explicit SROA(signed T = -1) : FunctionPass(&ID) {
if (T == -1)
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<DominatorTree>();
AU.addRequired<DominanceFrontier>();
- AU.addRequired<TargetData>();
AU.setPreservesCFG();
}
private:
TargetData *TD;
+ /// DeadInsts - Keep track of instructions we have made dead, so that
+ /// we can remove them after we are done working.
+ SmallVector<Value*, 32> DeadInsts;
+
/// AllocaInfo - When analyzing uses of an alloca instruction, this captures
/// information about the uses. All these fields are initialized to false
/// and set to true when something is learned.
void MarkUnsafe(AllocaInfo &I) { I.isUnsafe = true; }
- int isSafeAllocaToScalarRepl(AllocationInst *AI);
-
- void isSafeUseOfAllocation(Instruction *User, AllocationInst *AI,
- AllocaInfo &Info);
- void isSafeElementUse(Value *Ptr, bool isFirstElt, AllocationInst *AI,
- AllocaInfo &Info);
- void isSafeMemIntrinsicOnAllocation(MemIntrinsic *MI, AllocationInst *AI,
- unsigned OpNo, AllocaInfo &Info);
- void isSafeUseOfBitCastedAllocation(BitCastInst *User, AllocationInst *AI,
- AllocaInfo &Info);
-
- void DoScalarReplacement(AllocationInst *AI,
- std::vector<AllocationInst*> &WorkList);
- void CleanupGEP(GetElementPtrInst *GEP);
- void CleanupAllocaUsers(AllocationInst *AI);
- AllocaInst *AddNewAlloca(Function &F, const Type *Ty, AllocationInst *Base);
+ int isSafeAllocaToScalarRepl(AllocaInst *AI);
+
+ void isSafeForScalarRepl(Instruction *I, AllocaInst *AI, uint64_t Offset,
+ AllocaInfo &Info);
+ void isSafeGEP(GetElementPtrInst *GEPI, AllocaInst *AI, uint64_t &Offset,
+ AllocaInfo &Info);
+ void isSafeMemAccess(AllocaInst *AI, uint64_t Offset, uint64_t MemSize,
+ const Type *MemOpType, bool isStore, AllocaInfo &Info);
+ bool TypeHasComponent(const Type *T, uint64_t Offset, uint64_t Size);
+ uint64_t FindElementAndOffset(const Type *&T, uint64_t &Offset,
+ const Type *&IdxTy);
- void RewriteBitCastUserOfAlloca(Instruction *BCInst, AllocationInst *AI,
- SmallVector<AllocaInst*, 32> &NewElts);
+ void DoScalarReplacement(AllocaInst *AI,
+ std::vector<AllocaInst*> &WorkList);
+ void DeleteDeadInstructions();
+ void CleanupAllocaUsers(Value *V);
+ AllocaInst *AddNewAlloca(Function &F, const Type *Ty, AllocaInst *Base);
- void RewriteMemIntrinUserOfAlloca(MemIntrinsic *MI, Instruction *BCInst,
- AllocationInst *AI,
+ void RewriteForScalarRepl(Instruction *I, AllocaInst *AI, uint64_t Offset,
+ SmallVector<AllocaInst*, 32> &NewElts);
+ void RewriteBitCast(BitCastInst *BC, AllocaInst *AI, uint64_t Offset,
+ SmallVector<AllocaInst*, 32> &NewElts);
+ void RewriteGEP(GetElementPtrInst *GEPI, AllocaInst *AI, uint64_t Offset,
+ SmallVector<AllocaInst*, 32> &NewElts);
+ void RewriteMemIntrinUserOfAlloca(MemIntrinsic *MI, Instruction *Inst,
+ AllocaInst *AI,
SmallVector<AllocaInst*, 32> &NewElts);
- void RewriteStoreUserOfWholeAlloca(StoreInst *SI, AllocationInst *AI,
+ void RewriteStoreUserOfWholeAlloca(StoreInst *SI, AllocaInst *AI,
SmallVector<AllocaInst*, 32> &NewElts);
- void RewriteLoadUserOfWholeAlloca(LoadInst *LI, AllocationInst *AI,
+ void RewriteLoadUserOfWholeAlloca(LoadInst *LI, AllocaInst *AI,
SmallVector<AllocaInst*, 32> &NewElts);
bool CanConvertToScalar(Value *V, bool &IsNotTrivial, const Type *&VecTy,
uint64_t Offset, IRBuilder<> &Builder);
Value *ConvertScalar_InsertValue(Value *StoredVal, Value *ExistingVal,
uint64_t Offset, IRBuilder<> &Builder);
- static Instruction *isOnlyCopiedFromConstantGlobal(AllocationInst *AI);
+ static Instruction *isOnlyCopiedFromConstantGlobal(AllocaInst *AI);
};
}
bool SROA::runOnFunction(Function &F) {
- TD = &getAnalysis<TargetData>();
-
+ TD = getAnalysisIfAvailable<TargetData>();
+
bool Changed = performPromotion(F);
+
+ // FIXME: ScalarRepl currently depends on TargetData more than it
+ // theoretically needs to. It should be refactored in order to support
+ // target-independent IR. Until this is done, just skip the actual
+ // scalar-replacement portion of this pass.
+ if (!TD) return Changed;
+
while (1) {
bool LocalChange = performScalarRepl(F);
if (!LocalChange) break; // No need to repromote if no scalarrepl
// them if they are only used by getelementptr instructions.
//
bool SROA::performScalarRepl(Function &F) {
- std::vector<AllocationInst*> WorkList;
+ std::vector<AllocaInst*> WorkList;
// Scan the entry basic block, adding any alloca's and mallocs to the worklist
BasicBlock &BB = F.getEntryBlock();
for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I)
- if (AllocationInst *A = dyn_cast<AllocationInst>(I))
+ if (AllocaInst *A = dyn_cast<AllocaInst>(I))
WorkList.push_back(A);
// Process the worklist
bool Changed = false;
while (!WorkList.empty()) {
- AllocationInst *AI = WorkList.back();
+ AllocaInst *AI = WorkList.back();
WorkList.pop_back();
// Handle dead allocas trivially. These can be formed by SROA'ing arrays
// constructs like "void foo() { int A[] = {1,2,3,4,5,6,7,8,9...}; }" if 'A'
// is only subsequently read.
if (Instruction *TheCopy = isOnlyCopiedFromConstantGlobal(AI)) {
- DOUT << "Found alloca equal to global: " << *AI;
- DOUT << " memcpy = " << *TheCopy;
+ DEBUG(dbgs() << "Found alloca equal to global: " << *AI << '\n');
+ DEBUG(dbgs() << " memcpy = " << *TheCopy << '\n');
Constant *TheSrc = cast<Constant>(TheCopy->getOperand(2));
- AI->replaceAllUsesWith(
- Context->getConstantExprBitCast(TheSrc, AI->getType()));
+ AI->replaceAllUsesWith(ConstantExpr::getBitCast(TheSrc, AI->getType()));
TheCopy->eraseFromParent(); // Don't mutate the global.
AI->eraseFromParent();
++NumGlobals;
// value cannot be decomposed at all.
uint64_t AllocaSize = TD->getTypeAllocSize(AI->getAllocatedType());
+ // Do not promote [0 x %struct].
+ if (AllocaSize == 0) continue;
+
// Do not promote any struct whose size is too big.
if (AllocaSize > SRThreshold) continue;
-
+
if ((isa<StructType>(AI->getAllocatedType()) ||
isa<ArrayType>(AI->getAllocatedType())) &&
// Do not promote any struct into more than "32" separate vars.
// Check that all of the users of the allocation are capable of being
// transformed.
switch (isSafeAllocaToScalarRepl(AI)) {
- default: assert(0 && "Unexpected value!");
+ default: llvm_unreachable("Unexpected value!");
case 0: // Not safe to scalar replace.
break;
case 1: // Safe, but requires cleanup/canonicalizations first
// we just get a lot of insert/extracts. If at least one vector is
// involved, then we probably really do have a union of vector/array.
if (VectorTy && isa<VectorType>(VectorTy) && HadAVector) {
- DOUT << "CONVERT TO VECTOR: " << *AI << " TYPE = " << *VectorTy <<"\n";
+ DEBUG(dbgs() << "CONVERT TO VECTOR: " << *AI << "\n TYPE = "
+ << *VectorTy << '\n');
// Create and insert the vector alloca.
- NewAI = new AllocaInst(VectorTy, 0, "", AI->getParent()->begin());
+ NewAI = new AllocaInst(VectorTy, 0, "", AI->getParent()->begin());
ConvertUsesToScalar(AI, NewAI, 0);
} else {
- DOUT << "CONVERT TO SCALAR INTEGER: " << *AI << "\n";
+ DEBUG(dbgs() << "CONVERT TO SCALAR INTEGER: " << *AI << "\n");
// Create and insert the integer alloca.
- const Type *NewTy = Context->getIntegerType(AllocaSize*8);
+ const Type *NewTy = IntegerType::get(AI->getContext(), AllocaSize*8);
NewAI = new AllocaInst(NewTy, 0, "", AI->getParent()->begin());
ConvertUsesToScalar(AI, NewAI, 0);
}
/// DoScalarReplacement - This alloca satisfied the isSafeAllocaToScalarRepl
/// predicate, do SROA now.
-void SROA::DoScalarReplacement(AllocationInst *AI,
- std::vector<AllocationInst*> &WorkList) {
- DOUT << "Found inst to SROA: " << *AI;
+void SROA::DoScalarReplacement(AllocaInst *AI,
+ std::vector<AllocaInst*> &WorkList) {
+ DEBUG(dbgs() << "Found inst to SROA: " << *AI << '\n');
SmallVector<AllocaInst*, 32> ElementAllocas;
if (const StructType *ST = dyn_cast<StructType>(AI->getAllocatedType())) {
ElementAllocas.reserve(ST->getNumContainedTypes());
for (unsigned i = 0, e = ST->getNumContainedTypes(); i != e; ++i) {
AllocaInst *NA = new AllocaInst(ST->getContainedType(i), 0,
AI->getAlignment(),
- AI->getName() + "." + utostr(i), AI);
+ AI->getName() + "." + Twine(i), AI);
ElementAllocas.push_back(NA);
WorkList.push_back(NA); // Add to worklist for recursive processing
}
const Type *ElTy = AT->getElementType();
for (unsigned i = 0, e = AT->getNumElements(); i != e; ++i) {
AllocaInst *NA = new AllocaInst(ElTy, 0, AI->getAlignment(),
- AI->getName() + "." + utostr(i), AI);
+ AI->getName() + "." + Twine(i), AI);
ElementAllocas.push_back(NA);
WorkList.push_back(NA); // Add to worklist for recursive processing
}
}
- // Now that we have created the alloca instructions that we want to use,
- // expand the getelementptr instructions to use them.
- //
- while (!AI->use_empty()) {
- Instruction *User = cast<Instruction>(AI->use_back());
- if (BitCastInst *BCInst = dyn_cast<BitCastInst>(User)) {
- RewriteBitCastUserOfAlloca(BCInst, AI, ElementAllocas);
- BCInst->eraseFromParent();
- continue;
- }
-
- // Replace:
- // %res = load { i32, i32 }* %alloc
- // with:
- // %load.0 = load i32* %alloc.0
- // %insert.0 insertvalue { i32, i32 } zeroinitializer, i32 %load.0, 0
- // %load.1 = load i32* %alloc.1
- // %insert = insertvalue { i32, i32 } %insert.0, i32 %load.1, 1
- // (Also works for arrays instead of structs)
- if (LoadInst *LI = dyn_cast<LoadInst>(User)) {
- Value *Insert = Context->getUndef(LI->getType());
- for (unsigned i = 0, e = ElementAllocas.size(); i != e; ++i) {
- Value *Load = new LoadInst(ElementAllocas[i], "load", LI);
- Insert = InsertValueInst::Create(Insert, Load, i, "insert", LI);
- }
- LI->replaceAllUsesWith(Insert);
- LI->eraseFromParent();
- continue;
- }
+ // Now that we have created the new alloca instructions, rewrite all the
+ // uses of the old alloca.
+ RewriteForScalarRepl(AI, AI, 0, ElementAllocas);
- // Replace:
- // store { i32, i32 } %val, { i32, i32 }* %alloc
- // with:
- // %val.0 = extractvalue { i32, i32 } %val, 0
- // store i32 %val.0, i32* %alloc.0
- // %val.1 = extractvalue { i32, i32 } %val, 1
- // store i32 %val.1, i32* %alloc.1
- // (Also works for arrays instead of structs)
- if (StoreInst *SI = dyn_cast<StoreInst>(User)) {
- Value *Val = SI->getOperand(0);
- for (unsigned i = 0, e = ElementAllocas.size(); i != e; ++i) {
- Value *Extract = ExtractValueInst::Create(Val, i, Val->getName(), SI);
- new StoreInst(Extract, ElementAllocas[i], SI);
- }
- SI->eraseFromParent();
- continue;
- }
-
- GetElementPtrInst *GEPI = cast<GetElementPtrInst>(User);
- // We now know that the GEP is of the form: GEP <ptr>, 0, <cst>
- unsigned Idx =
- (unsigned)cast<ConstantInt>(GEPI->getOperand(2))->getZExtValue();
-
- assert(Idx < ElementAllocas.size() && "Index out of range?");
- AllocaInst *AllocaToUse = ElementAllocas[Idx];
-
- Value *RepValue;
- if (GEPI->getNumOperands() == 3) {
- // Do not insert a new getelementptr instruction with zero indices, only
- // to have it optimized out later.
- RepValue = AllocaToUse;
- } else {
- // We are indexing deeply into the structure, so we still need a
- // getelement ptr instruction to finish the indexing. This may be
- // expanded itself once the worklist is rerun.
- //
- SmallVector<Value*, 8> NewArgs;
- NewArgs.push_back(Context->getNullValue(Type::Int32Ty));
- NewArgs.append(GEPI->op_begin()+3, GEPI->op_end());
- RepValue = GetElementPtrInst::Create(AllocaToUse, NewArgs.begin(),
- NewArgs.end(), "", GEPI);
- RepValue->takeName(GEPI);
- }
-
- // If this GEP is to the start of the aggregate, check for memcpys.
- if (Idx == 0 && GEPI->hasAllZeroIndices())
- RewriteBitCastUserOfAlloca(GEPI, AI, ElementAllocas);
-
- // Move all of the users over to the new GEP.
- GEPI->replaceAllUsesWith(RepValue);
- // Delete the old GEP
- GEPI->eraseFromParent();
- }
-
- // Finally, delete the Alloca instruction
+ // Now erase any instructions that were made dead while rewriting the alloca.
+ DeleteDeadInstructions();
AI->eraseFromParent();
+
NumReplaced++;
}
-
-/// isSafeElementUse - Check to see if this use is an allowed use for a
-/// getelementptr instruction of an array aggregate allocation. isFirstElt
-/// indicates whether Ptr is known to the start of the aggregate.
-///
-void SROA::isSafeElementUse(Value *Ptr, bool isFirstElt, AllocationInst *AI,
- AllocaInfo &Info) {
- for (Value::use_iterator I = Ptr->use_begin(), E = Ptr->use_end();
- I != E; ++I) {
- Instruction *User = cast<Instruction>(*I);
- switch (User->getOpcode()) {
- case Instruction::Load: break;
- case Instruction::Store:
- // Store is ok if storing INTO the pointer, not storing the pointer
- if (User->getOperand(0) == Ptr) return MarkUnsafe(Info);
- break;
- case Instruction::GetElementPtr: {
- GetElementPtrInst *GEP = cast<GetElementPtrInst>(User);
- bool AreAllZeroIndices = isFirstElt;
- if (GEP->getNumOperands() > 1) {
- if (!isa<ConstantInt>(GEP->getOperand(1)) ||
- !cast<ConstantInt>(GEP->getOperand(1))->isZero())
- // Using pointer arithmetic to navigate the array.
- return MarkUnsafe(Info);
-
- if (AreAllZeroIndices)
- AreAllZeroIndices = GEP->hasAllZeroIndices();
- }
- isSafeElementUse(GEP, AreAllZeroIndices, AI, Info);
- if (Info.isUnsafe) return;
- break;
- }
- case Instruction::BitCast:
- if (isFirstElt) {
- isSafeUseOfBitCastedAllocation(cast<BitCastInst>(User), AI, Info);
- if (Info.isUnsafe) return;
- break;
+/// DeleteDeadInstructions - Erase instructions on the DeadInstrs list,
+/// recursively including all their operands that become trivially dead.
+void SROA::DeleteDeadInstructions() {
+ while (!DeadInsts.empty()) {
+ Instruction *I = cast<Instruction>(DeadInsts.pop_back_val());
+
+ for (User::op_iterator OI = I->op_begin(), E = I->op_end(); OI != E; ++OI)
+ if (Instruction *U = dyn_cast<Instruction>(*OI)) {
+ // Zero out the operand and see if it becomes trivially dead.
+ // (But, don't add allocas to the dead instruction list -- they are
+ // already on the worklist and will be deleted separately.)
+ *OI = 0;
+ if (isInstructionTriviallyDead(U) && !isa<AllocaInst>(U))
+ DeadInsts.push_back(U);
}
- DOUT << " Transformation preventing inst: " << *User;
- return MarkUnsafe(Info);
- case Instruction::Call:
- if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(User)) {
- if (isFirstElt) {
- isSafeMemIntrinsicOnAllocation(MI, AI, I.getOperandNo(), Info);
- if (Info.isUnsafe) return;
- break;
- }
- }
- DOUT << " Transformation preventing inst: " << *User;
- return MarkUnsafe(Info);
- default:
- DOUT << " Transformation preventing inst: " << *User;
- return MarkUnsafe(Info);
- }
- }
- return; // All users look ok :)
-}
-
-/// AllUsersAreLoads - Return true if all users of this value are loads.
-static bool AllUsersAreLoads(Value *Ptr) {
- for (Value::use_iterator I = Ptr->use_begin(), E = Ptr->use_end();
- I != E; ++I)
- if (cast<Instruction>(*I)->getOpcode() != Instruction::Load)
- return false;
- return true;
-}
-/// isSafeUseOfAllocation - Check to see if this user is an allowed use for an
-/// aggregate allocation.
-///
-void SROA::isSafeUseOfAllocation(Instruction *User, AllocationInst *AI,
- AllocaInfo &Info) {
- if (BitCastInst *C = dyn_cast<BitCastInst>(User))
- return isSafeUseOfBitCastedAllocation(C, AI, Info);
-
- if (LoadInst *LI = dyn_cast<LoadInst>(User))
- if (!LI->isVolatile())
- return;// Loads (returning a first class aggregrate) are always rewritable
-
- if (StoreInst *SI = dyn_cast<StoreInst>(User))
- if (!SI->isVolatile() && SI->getOperand(0) != AI)
- return;// Store is ok if storing INTO the pointer, not storing the pointer
-
- GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(User);
- if (GEPI == 0)
- return MarkUnsafe(Info);
-
- gep_type_iterator I = gep_type_begin(GEPI), E = gep_type_end(GEPI);
-
- // The GEP is not safe to transform if not of the form "GEP <ptr>, 0, <cst>".
- if (I == E ||
- I.getOperand() != Context->getNullValue(I.getOperand()->getType())) {
- return MarkUnsafe(Info);
+ I->eraseFromParent();
}
+}
+
+/// isSafeForScalarRepl - Check if instruction I is a safe use with regard to
+/// performing scalar replacement of alloca AI. The results are flagged in
+/// the Info parameter. Offset indicates the position within AI that is
+/// referenced by this instruction.
+void SROA::isSafeForScalarRepl(Instruction *I, AllocaInst *AI, uint64_t Offset,
+ AllocaInfo &Info) {
+ for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI!=E; ++UI) {
+ Instruction *User = cast<Instruction>(*UI);
- ++I;
- if (I == E) return MarkUnsafe(Info); // ran out of GEP indices??
-
- bool IsAllZeroIndices = true;
-
- // If the first index is a non-constant index into an array, see if we can
- // handle it as a special case.
- if (const ArrayType *AT = dyn_cast<ArrayType>(*I)) {
- if (!isa<ConstantInt>(I.getOperand())) {
- IsAllZeroIndices = 0;
- uint64_t NumElements = AT->getNumElements();
-
- // If this is an array index and the index is not constant, we cannot
- // promote... that is unless the array has exactly one or two elements in
- // it, in which case we CAN promote it, but we have to canonicalize this
- // out if this is the only problem.
- if ((NumElements == 1 || NumElements == 2) &&
- AllUsersAreLoads(GEPI)) {
+ if (BitCastInst *BC = dyn_cast<BitCastInst>(User)) {
+ isSafeForScalarRepl(BC, AI, Offset, Info);
+ } else if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(User)) {
+ uint64_t GEPOffset = Offset;
+ isSafeGEP(GEPI, AI, GEPOffset, Info);
+ if (!Info.isUnsafe)
+ isSafeForScalarRepl(GEPI, AI, GEPOffset, Info);
+ } else if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(UI)) {
+ ConstantInt *Length = dyn_cast<ConstantInt>(MI->getLength());
+ if (Length)
+ isSafeMemAccess(AI, Offset, Length->getZExtValue(), 0,
+ UI.getOperandNo() == 1, Info);
+ else
+ MarkUnsafe(Info);
+ } else if (LoadInst *LI = dyn_cast<LoadInst>(User)) {
+ if (!LI->isVolatile()) {
+ const Type *LIType = LI->getType();
+ isSafeMemAccess(AI, Offset, TD->getTypeAllocSize(LIType),
+ LIType, false, Info);
+ } else
+ MarkUnsafe(Info);
+ } else if (StoreInst *SI = dyn_cast<StoreInst>(User)) {
+ // Store is ok if storing INTO the pointer, not storing the pointer
+ if (!SI->isVolatile() && SI->getOperand(0) != I) {
+ const Type *SIType = SI->getOperand(0)->getType();
+ isSafeMemAccess(AI, Offset, TD->getTypeAllocSize(SIType),
+ SIType, true, Info);
+ } else
+ MarkUnsafe(Info);
+ } else if (isa<DbgInfoIntrinsic>(UI)) {
+ // If one user is DbgInfoIntrinsic then check if all users are
+ // DbgInfoIntrinsics.
+ if (OnlyUsedByDbgInfoIntrinsics(I)) {
Info.needsCleanup = true;
- return; // Canonicalization required!
+ return;
}
- return MarkUnsafe(Info);
+ MarkUnsafe(Info);
+ } else {
+ DEBUG(errs() << " Transformation preventing inst: " << *User << '\n');
+ MarkUnsafe(Info);
}
+ if (Info.isUnsafe) return;
}
-
+}
+
+/// isSafeGEP - Check if a GEP instruction can be handled for scalar
+/// replacement. It is safe when all the indices are constant, in-bounds
+/// references, and when the resulting offset corresponds to an element within
+/// the alloca type. The results are flagged in the Info parameter. Upon
+/// return, Offset is adjusted as specified by the GEP indices.
+void SROA::isSafeGEP(GetElementPtrInst *GEPI, AllocaInst *AI,
+ uint64_t &Offset, AllocaInfo &Info) {
+ gep_type_iterator GEPIt = gep_type_begin(GEPI), E = gep_type_end(GEPI);
+ if (GEPIt == E)
+ return;
+
// Walk through the GEP type indices, checking the types that this indexes
// into.
- for (; I != E; ++I) {
+ for (; GEPIt != E; ++GEPIt) {
// Ignore struct elements, no extra checking needed for these.
- if (isa<StructType>(*I))
+ if (isa<StructType>(*GEPIt))
continue;
-
- ConstantInt *IdxVal = dyn_cast<ConstantInt>(I.getOperand());
- if (!IdxVal) return MarkUnsafe(Info);
- // Are all indices still zero?
- IsAllZeroIndices &= IdxVal->isZero();
-
- if (const ArrayType *AT = dyn_cast<ArrayType>(*I)) {
- // This GEP indexes an array. Verify that this is an in-range constant
- // integer. Specifically, consider A[0][i]. We cannot know that the user
- // isn't doing invalid things like allowing i to index an out-of-range
- // subscript that accesses A[1]. Because of this, we have to reject SROA
- // of any accesses into structs where any of the components are variables.
- if (IdxVal->getZExtValue() >= AT->getNumElements())
- return MarkUnsafe(Info);
- } else if (const VectorType *VT = dyn_cast<VectorType>(*I)) {
- if (IdxVal->getZExtValue() >= VT->getNumElements())
- return MarkUnsafe(Info);
+ ConstantInt *IdxVal = dyn_cast<ConstantInt>(GEPIt.getOperand());
+ if (!IdxVal)
+ return MarkUnsafe(Info);
+ }
+
+ // Compute the offset due to this GEP and check if the alloca has a
+ // component element at that offset.
+ SmallVector<Value*, 8> Indices(GEPI->op_begin() + 1, GEPI->op_end());
+ Offset += TD->getIndexedOffset(GEPI->getPointerOperandType(),
+ &Indices[0], Indices.size());
+ if (!TypeHasComponent(AI->getAllocatedType(), Offset, 0))
+ MarkUnsafe(Info);
+}
+
+/// isSafeMemAccess - Check if a load/store/memcpy operates on the entire AI
+/// alloca or has an offset and size that corresponds to a component element
+/// within it. The offset checked here may have been formed from a GEP with a
+/// pointer bitcasted to a different type.
+void SROA::isSafeMemAccess(AllocaInst *AI, uint64_t Offset, uint64_t MemSize,
+ const Type *MemOpType, bool isStore,
+ AllocaInfo &Info) {
+ // Check if this is a load/store of the entire alloca.
+ if (Offset == 0 && MemSize == TD->getTypeAllocSize(AI->getAllocatedType())) {
+ bool UsesAggregateType = (MemOpType == AI->getAllocatedType());
+ // This is safe for MemIntrinsics (where MemOpType is 0), integer types
+ // (which are essentially the same as the MemIntrinsics, especially with
+ // regard to copying padding between elements), or references using the
+ // aggregate type of the alloca.
+ if (!MemOpType || isa<IntegerType>(MemOpType) || UsesAggregateType) {
+ if (!UsesAggregateType) {
+ if (isStore)
+ Info.isMemCpyDst = true;
+ else
+ Info.isMemCpySrc = true;
+ }
+ return;
}
}
-
- // If there are any non-simple uses of this getelementptr, make sure to reject
- // them.
- return isSafeElementUse(GEPI, IsAllZeroIndices, AI, Info);
+ // Check if the offset/size correspond to a component within the alloca type.
+ const Type *T = AI->getAllocatedType();
+ if (TypeHasComponent(T, Offset, MemSize))
+ return;
+
+ return MarkUnsafe(Info);
}
-/// isSafeMemIntrinsicOnAllocation - Return true if the specified memory
-/// intrinsic can be promoted by SROA. At this point, we know that the operand
-/// of the memintrinsic is a pointer to the beginning of the allocation.
-void SROA::isSafeMemIntrinsicOnAllocation(MemIntrinsic *MI, AllocationInst *AI,
- unsigned OpNo, AllocaInfo &Info) {
- // If not constant length, give up.
- ConstantInt *Length = dyn_cast<ConstantInt>(MI->getLength());
- if (!Length) return MarkUnsafe(Info);
-
- // If not the whole aggregate, give up.
- if (Length->getZExtValue() !=
- TD->getTypeAllocSize(AI->getType()->getElementType()))
- return MarkUnsafe(Info);
-
- // We only know about memcpy/memset/memmove.
- if (!isa<MemIntrinsic>(MI))
- return MarkUnsafe(Info);
-
- // Otherwise, we can transform it. Determine whether this is a memcpy/set
- // into or out of the aggregate.
- if (OpNo == 1)
- Info.isMemCpyDst = true;
- else {
- assert(OpNo == 2);
- Info.isMemCpySrc = true;
+/// TypeHasComponent - Return true if T has a component type with the
+/// specified offset and size. If Size is zero, do not check the size.
+bool SROA::TypeHasComponent(const Type *T, uint64_t Offset, uint64_t Size) {
+ const Type *EltTy;
+ uint64_t EltSize;
+ if (const StructType *ST = dyn_cast<StructType>(T)) {
+ const StructLayout *Layout = TD->getStructLayout(ST);
+ unsigned EltIdx = Layout->getElementContainingOffset(Offset);
+ EltTy = ST->getContainedType(EltIdx);
+ EltSize = TD->getTypeAllocSize(EltTy);
+ Offset -= Layout->getElementOffset(EltIdx);
+ } else if (const ArrayType *AT = dyn_cast<ArrayType>(T)) {
+ EltTy = AT->getElementType();
+ EltSize = TD->getTypeAllocSize(EltTy);
+ if (Offset >= AT->getNumElements() * EltSize)
+ return false;
+ Offset %= EltSize;
+ } else {
+ return false;
}
+ if (Offset == 0 && (Size == 0 || EltSize == Size))
+ return true;
+ // Check if the component spans multiple elements.
+ if (Offset + Size > EltSize)
+ return false;
+ return TypeHasComponent(EltTy, Offset, Size);
}
-/// isSafeUseOfBitCastedAllocation - Return true if all users of this bitcast
-/// are
-void SROA::isSafeUseOfBitCastedAllocation(BitCastInst *BC, AllocationInst *AI,
- AllocaInfo &Info) {
- for (Value::use_iterator UI = BC->use_begin(), E = BC->use_end();
- UI != E; ++UI) {
- if (BitCastInst *BCU = dyn_cast<BitCastInst>(UI)) {
- isSafeUseOfBitCastedAllocation(BCU, AI, Info);
- } else if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(UI)) {
- isSafeMemIntrinsicOnAllocation(MI, AI, UI.getOperandNo(), Info);
- } else if (StoreInst *SI = dyn_cast<StoreInst>(UI)) {
- if (SI->isVolatile())
- return MarkUnsafe(Info);
-
- // If storing the entire alloca in one chunk through a bitcasted pointer
- // to integer, we can transform it. This happens (for example) when you
- // cast a {i32,i32}* to i64* and store through it. This is similar to the
- // memcpy case and occurs in various "byval" cases and emulated memcpys.
- if (isa<IntegerType>(SI->getOperand(0)->getType()) &&
- TD->getTypeAllocSize(SI->getOperand(0)->getType()) ==
- TD->getTypeAllocSize(AI->getType()->getElementType())) {
- Info.isMemCpyDst = true;
- continue;
- }
- return MarkUnsafe(Info);
- } else if (LoadInst *LI = dyn_cast<LoadInst>(UI)) {
- if (LI->isVolatile())
- return MarkUnsafe(Info);
-
- // If loading the entire alloca in one chunk through a bitcasted pointer
- // to integer, we can transform it. This happens (for example) when you
- // cast a {i32,i32}* to i64* and load through it. This is similar to the
- // memcpy case and occurs in various "byval" cases and emulated memcpys.
- if (isa<IntegerType>(LI->getType()) &&
- TD->getTypeAllocSize(LI->getType()) ==
- TD->getTypeAllocSize(AI->getType()->getElementType())) {
- Info.isMemCpySrc = true;
- continue;
+/// RewriteForScalarRepl - Alloca AI is being split into NewElts, so rewrite
+/// the instruction I, which references it, to use the separate elements.
+/// Offset indicates the position within AI that is referenced by this
+/// instruction.
+void SROA::RewriteForScalarRepl(Instruction *I, AllocaInst *AI, uint64_t Offset,
+ SmallVector<AllocaInst*, 32> &NewElts) {
+ for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI!=E; ++UI) {
+ Instruction *User = cast<Instruction>(*UI);
+
+ if (BitCastInst *BC = dyn_cast<BitCastInst>(User)) {
+ RewriteBitCast(BC, AI, Offset, NewElts);
+ } else if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(User)) {
+ RewriteGEP(GEPI, AI, Offset, NewElts);
+ } else if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(User)) {
+ ConstantInt *Length = dyn_cast<ConstantInt>(MI->getLength());
+ uint64_t MemSize = Length->getZExtValue();
+ if (Offset == 0 &&
+ MemSize == TD->getTypeAllocSize(AI->getAllocatedType()))
+ RewriteMemIntrinUserOfAlloca(MI, I, AI, NewElts);
+ // Otherwise the intrinsic can only touch a single element and the
+ // address operand will be updated, so nothing else needs to be done.
+ } else if (LoadInst *LI = dyn_cast<LoadInst>(User)) {
+ const Type *LIType = LI->getType();
+ if (LIType == AI->getAllocatedType()) {
+ // Replace:
+ // %res = load { i32, i32 }* %alloc
+ // with:
+ // %load.0 = load i32* %alloc.0
+ // %insert.0 insertvalue { i32, i32 } zeroinitializer, i32 %load.0, 0
+ // %load.1 = load i32* %alloc.1
+ // %insert = insertvalue { i32, i32 } %insert.0, i32 %load.1, 1
+ // (Also works for arrays instead of structs)
+ Value *Insert = UndefValue::get(LIType);
+ for (unsigned i = 0, e = NewElts.size(); i != e; ++i) {
+ Value *Load = new LoadInst(NewElts[i], "load", LI);
+ Insert = InsertValueInst::Create(Insert, Load, i, "insert", LI);
+ }
+ LI->replaceAllUsesWith(Insert);
+ DeadInsts.push_back(LI);
+ } else if (isa<IntegerType>(LIType) &&
+ TD->getTypeAllocSize(LIType) ==
+ TD->getTypeAllocSize(AI->getAllocatedType())) {
+ // If this is a load of the entire alloca to an integer, rewrite it.
+ RewriteLoadUserOfWholeAlloca(LI, AI, NewElts);
}
- return MarkUnsafe(Info);
- } else if (isa<DbgInfoIntrinsic>(UI)) {
- // If one user is DbgInfoIntrinsic then check if all users are
- // DbgInfoIntrinsics.
- if (OnlyUsedByDbgInfoIntrinsics(BC)) {
- Info.needsCleanup = true;
- return;
+ } else if (StoreInst *SI = dyn_cast<StoreInst>(User)) {
+ Value *Val = SI->getOperand(0);
+ const Type *SIType = Val->getType();
+ if (SIType == AI->getAllocatedType()) {
+ // Replace:
+ // store { i32, i32 } %val, { i32, i32 }* %alloc
+ // with:
+ // %val.0 = extractvalue { i32, i32 } %val, 0
+ // store i32 %val.0, i32* %alloc.0
+ // %val.1 = extractvalue { i32, i32 } %val, 1
+ // store i32 %val.1, i32* %alloc.1
+ // (Also works for arrays instead of structs)
+ for (unsigned i = 0, e = NewElts.size(); i != e; ++i) {
+ Value *Extract = ExtractValueInst::Create(Val, i, Val->getName(), SI);
+ new StoreInst(Extract, NewElts[i], SI);
+ }
+ DeadInsts.push_back(SI);
+ } else if (isa<IntegerType>(SIType) &&
+ TD->getTypeAllocSize(SIType) ==
+ TD->getTypeAllocSize(AI->getAllocatedType())) {
+ // If this is a store of the entire alloca from an integer, rewrite it.
+ RewriteStoreUserOfWholeAlloca(SI, AI, NewElts);
}
- else
- MarkUnsafe(Info);
- }
- else {
- return MarkUnsafe(Info);
}
- if (Info.isUnsafe) return;
}
}
-/// RewriteBitCastUserOfAlloca - BCInst (transitively) bitcasts AI, or indexes
-/// to its first element. Transform users of the cast to use the new values
-/// instead.
-void SROA::RewriteBitCastUserOfAlloca(Instruction *BCInst, AllocationInst *AI,
- SmallVector<AllocaInst*, 32> &NewElts) {
- Value::use_iterator UI = BCInst->use_begin(), UE = BCInst->use_end();
- while (UI != UE) {
- Instruction *User = cast<Instruction>(*UI++);
- if (BitCastInst *BCU = dyn_cast<BitCastInst>(User)) {
- RewriteBitCastUserOfAlloca(BCU, AI, NewElts);
- if (BCU->use_empty()) BCU->eraseFromParent();
- continue;
- }
+/// RewriteBitCast - Update a bitcast reference to the alloca being replaced
+/// and recursively continue updating all of its uses.
+void SROA::RewriteBitCast(BitCastInst *BC, AllocaInst *AI, uint64_t Offset,
+ SmallVector<AllocaInst*, 32> &NewElts) {
+ RewriteForScalarRepl(BC, AI, Offset, NewElts);
+ if (BC->getOperand(0) != AI)
+ return;
- if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(User)) {
- // This must be memcpy/memmove/memset of the entire aggregate.
- // Split into one per element.
- RewriteMemIntrinUserOfAlloca(MI, BCInst, AI, NewElts);
- continue;
- }
-
- if (StoreInst *SI = dyn_cast<StoreInst>(User)) {
- // If this is a store of the entire alloca from an integer, rewrite it.
- RewriteStoreUserOfWholeAlloca(SI, AI, NewElts);
- continue;
- }
+ // The bitcast references the original alloca. Replace its uses with
+ // references to the first new element alloca.
+ Instruction *Val = NewElts[0];
+ if (Val->getType() != BC->getDestTy()) {
+ Val = new BitCastInst(Val, BC->getDestTy(), "", BC);
+ Val->takeName(BC);
+ }
+ BC->replaceAllUsesWith(Val);
+ DeadInsts.push_back(BC);
+}
- if (LoadInst *LI = dyn_cast<LoadInst>(User)) {
- // If this is a load of the entire alloca to an integer, rewrite it.
- RewriteLoadUserOfWholeAlloca(LI, AI, NewElts);
- continue;
- }
-
- // Otherwise it must be some other user of a gep of the first pointer. Just
- // leave these alone.
- continue;
+/// FindElementAndOffset - Return the index of the element containing Offset
+/// within the specified type, which must be either a struct or an array.
+/// Sets T to the type of the element and Offset to the offset within that
+/// element. IdxTy is set to the type of the index result to be used in a
+/// GEP instruction.
+uint64_t SROA::FindElementAndOffset(const Type *&T, uint64_t &Offset,
+ const Type *&IdxTy) {
+ uint64_t Idx = 0;
+ if (const StructType *ST = dyn_cast<StructType>(T)) {
+ const StructLayout *Layout = TD->getStructLayout(ST);
+ Idx = Layout->getElementContainingOffset(Offset);
+ T = ST->getContainedType(Idx);
+ Offset -= Layout->getElementOffset(Idx);
+ IdxTy = Type::getInt32Ty(T->getContext());
+ return Idx;
+ }
+ const ArrayType *AT = cast<ArrayType>(T);
+ T = AT->getElementType();
+ uint64_t EltSize = TD->getTypeAllocSize(T);
+ Idx = Offset / EltSize;
+ Offset -= Idx * EltSize;
+ IdxTy = Type::getInt64Ty(T->getContext());
+ return Idx;
+}
+
+/// RewriteGEP - Check if this GEP instruction moves the pointer across
+/// elements of the alloca that are being split apart, and if so, rewrite
+/// the GEP to be relative to the new element.
+void SROA::RewriteGEP(GetElementPtrInst *GEPI, AllocaInst *AI, uint64_t Offset,
+ SmallVector<AllocaInst*, 32> &NewElts) {
+ uint64_t OldOffset = Offset;
+ SmallVector<Value*, 8> Indices(GEPI->op_begin() + 1, GEPI->op_end());
+ Offset += TD->getIndexedOffset(GEPI->getPointerOperandType(),
+ &Indices[0], Indices.size());
+
+ RewriteForScalarRepl(GEPI, AI, Offset, NewElts);
+
+ const Type *T = AI->getAllocatedType();
+ const Type *IdxTy;
+ uint64_t OldIdx = FindElementAndOffset(T, OldOffset, IdxTy);
+ if (GEPI->getOperand(0) == AI)
+ OldIdx = ~0ULL; // Force the GEP to be rewritten.
+
+ T = AI->getAllocatedType();
+ uint64_t EltOffset = Offset;
+ uint64_t Idx = FindElementAndOffset(T, EltOffset, IdxTy);
+
+ // If this GEP does not move the pointer across elements of the alloca
+ // being split, then it does not needs to be rewritten.
+ if (Idx == OldIdx)
+ return;
+
+ const Type *i32Ty = Type::getInt32Ty(AI->getContext());
+ SmallVector<Value*, 8> NewArgs;
+ NewArgs.push_back(Constant::getNullValue(i32Ty));
+ while (EltOffset != 0) {
+ uint64_t EltIdx = FindElementAndOffset(T, EltOffset, IdxTy);
+ NewArgs.push_back(ConstantInt::get(IdxTy, EltIdx));
+ }
+ Instruction *Val = NewElts[Idx];
+ if (NewArgs.size() > 1) {
+ Val = GetElementPtrInst::CreateInBounds(Val, NewArgs.begin(),
+ NewArgs.end(), "", GEPI);
+ Val->takeName(GEPI);
}
+ if (Val->getType() != GEPI->getType())
+ Val = new BitCastInst(Val, GEPI->getType(), Val->getNameStr(), GEPI);
+ GEPI->replaceAllUsesWith(Val);
+ DeadInsts.push_back(GEPI);
}
/// RewriteMemIntrinUserOfAlloca - MI is a memcpy/memset/memmove from or to AI.
/// Rewrite it to copy or set the elements of the scalarized memory.
-void SROA::RewriteMemIntrinUserOfAlloca(MemIntrinsic *MI, Instruction *BCInst,
- AllocationInst *AI,
+void SROA::RewriteMemIntrinUserOfAlloca(MemIntrinsic *MI, Instruction *Inst,
+ AllocaInst *AI,
SmallVector<AllocaInst*, 32> &NewElts) {
-
// If this is a memcpy/memmove, construct the other pointer as the
// appropriate type. The "Other" pointer is the pointer that goes to memory
// that doesn't have anything to do with the alloca that we are promoting. For
// memset, this Value* stays null.
Value *OtherPtr = 0;
+ LLVMContext &Context = MI->getContext();
unsigned MemAlignment = MI->getAlignment();
if (MemTransferInst *MTI = dyn_cast<MemTransferInst>(MI)) { // memmove/memcopy
- if (BCInst == MTI->getRawDest())
+ if (Inst == MTI->getRawDest())
OtherPtr = MTI->getRawSource();
else {
- assert(BCInst == MTI->getRawSource());
+ assert(Inst == MTI->getRawSource());
OtherPtr = MTI->getRawDest();
}
}
-
+
// If there is an other pointer, we want to convert it to the same pointer
// type as AI has, so we can GEP through it safely.
if (OtherPtr) {
- // It is likely that OtherPtr is a bitcast, if so, remove it.
- if (BitCastInst *BC = dyn_cast<BitCastInst>(OtherPtr))
- OtherPtr = BC->getOperand(0);
- // All zero GEPs are effectively bitcasts.
- if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(OtherPtr))
- if (GEP->hasAllZeroIndices())
- OtherPtr = GEP->getOperand(0);
+
+ // Remove bitcasts and all-zero GEPs from OtherPtr. This is an
+ // optimization, but it's also required to detect the corner case where
+ // both pointer operands are referencing the same memory, and where
+ // OtherPtr may be a bitcast or GEP that currently being rewritten. (This
+ // function is only called for mem intrinsics that access the whole
+ // aggregate, so non-zero GEPs are not an issue here.)
+ while (1) {
+ if (BitCastInst *BC = dyn_cast<BitCastInst>(OtherPtr)) {
+ OtherPtr = BC->getOperand(0);
+ continue;
+ }
+ if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(OtherPtr)) {
+ // All zero GEPs are effectively bitcasts.
+ if (GEP->hasAllZeroIndices()) {
+ OtherPtr = GEP->getOperand(0);
+ continue;
+ }
+ }
+ break;
+ }
+ // If OtherPtr has already been rewritten, this intrinsic will be dead.
+ if (OtherPtr == NewElts[0])
+ return;
if (ConstantExpr *BCE = dyn_cast<ConstantExpr>(OtherPtr))
if (BCE->getOpcode() == Instruction::BitCast)
// Process each element of the aggregate.
Value *TheFn = MI->getOperand(0);
const Type *BytePtrTy = MI->getRawDest()->getType();
- bool SROADest = MI->getRawDest() == BCInst;
+ bool SROADest = MI->getRawDest() == Inst;
- Constant *Zero = Context->getNullValue(Type::Int32Ty);
+ Constant *Zero = Constant::getNullValue(Type::getInt32Ty(MI->getContext()));
for (unsigned i = 0, e = NewElts.size(); i != e; ++i) {
// If this is a memcpy/memmove, emit a GEP of the other element address.
Value *OtherElt = 0;
unsigned OtherEltAlign = MemAlignment;
- if (OtherPtr) {
- Value *Idx[2] = { Zero, Context->getConstantInt(Type::Int32Ty, i) };
- OtherElt = GetElementPtrInst::Create(OtherPtr, Idx, Idx + 2,
- OtherPtr->getNameStr()+"."+utostr(i),
- MI);
+ if (OtherPtr == AI) {
+ OtherElt = NewElts[i];
+ OtherEltAlign = 0;
+ } else if (OtherPtr) {
+ Value *Idx[2] = { Zero,
+ ConstantInt::get(Type::getInt32Ty(MI->getContext()), i) };
+ OtherElt = GetElementPtrInst::CreateInBounds(OtherPtr, Idx, Idx + 2,
+ OtherPtr->getNameStr()+"."+Twine(i),
+ MI);
uint64_t EltOffset;
const PointerType *OtherPtrTy = cast<PointerType>(OtherPtr->getType());
if (const StructType *ST =
Constant *StoreVal;
if (ConstantInt *CI = dyn_cast<ConstantInt>(MI->getOperand(2))) {
if (CI->isZero()) {
- StoreVal = Context->getNullValue(EltTy); // 0.0, null, 0, <0,0>
+ StoreVal = Constant::getNullValue(EltTy); // 0.0, null, 0, <0,0>
} else {
// If EltTy is a vector type, get the element type.
const Type *ValTy = EltTy->getScalarType();
}
// Convert the integer value to the appropriate type.
- StoreVal = Context->getConstantInt(TotalVal);
+ StoreVal = ConstantInt::get(Context, TotalVal);
if (isa<PointerType>(ValTy))
- StoreVal = Context->getConstantExprIntToPtr(StoreVal, ValTy);
+ StoreVal = ConstantExpr::getIntToPtr(StoreVal, ValTy);
else if (ValTy->isFloatingPoint())
- StoreVal = Context->getConstantExprBitCast(StoreVal, ValTy);
+ StoreVal = ConstantExpr::getBitCast(StoreVal, ValTy);
assert(StoreVal->getType() == ValTy && "Type mismatch!");
// If the requested value was a vector constant, create it.
if (EltTy != ValTy) {
unsigned NumElts = cast<VectorType>(ValTy)->getNumElements();
SmallVector<Constant*, 16> Elts(NumElts, StoreVal);
- StoreVal = Context->getConstantVector(&Elts[0], NumElts);
+ StoreVal = ConstantVector::get(&Elts[0], NumElts);
}
}
new StoreInst(StoreVal, EltPtr, MI);
Value *Ops[] = {
SROADest ? EltPtr : OtherElt, // Dest ptr
SROADest ? OtherElt : EltPtr, // Src ptr
- Context->getConstantInt(MI->getOperand(3)->getType(), EltSize), // Size
- Context->getConstantInt(Type::Int32Ty, OtherEltAlign) // Align
+ ConstantInt::get(MI->getOperand(3)->getType(), EltSize), // Size
+ // Align
+ ConstantInt::get(Type::getInt32Ty(MI->getContext()), OtherEltAlign)
};
CallInst::Create(TheFn, Ops, Ops + 4, "", MI);
} else {
assert(isa<MemSetInst>(MI));
Value *Ops[] = {
EltPtr, MI->getOperand(2), // Dest, Value,
- Context->getConstantInt(MI->getOperand(3)->getType(), EltSize), // Size
+ ConstantInt::get(MI->getOperand(3)->getType(), EltSize), // Size
Zero // Align
};
CallInst::Create(TheFn, Ops, Ops + 4, "", MI);
}
}
- MI->eraseFromParent();
+ DeadInsts.push_back(MI);
}
-/// RewriteStoreUserOfWholeAlloca - We found an store of an integer that
+/// RewriteStoreUserOfWholeAlloca - We found a store of an integer that
/// overwrites the entire allocation. Extract out the pieces of the stored
/// integer and store them individually.
-void SROA::RewriteStoreUserOfWholeAlloca(StoreInst *SI,
- AllocationInst *AI,
+void SROA::RewriteStoreUserOfWholeAlloca(StoreInst *SI, AllocaInst *AI,
SmallVector<AllocaInst*, 32> &NewElts){
// Extract each element out of the integer according to its structure offset
// and store the element value to the individual alloca.
Value *SrcVal = SI->getOperand(0);
- const Type *AllocaEltTy = AI->getType()->getElementType();
+ const Type *AllocaEltTy = AI->getAllocatedType();
uint64_t AllocaSizeBits = TD->getTypeAllocSizeInBits(AllocaEltTy);
- // If this isn't a store of an integer to the whole alloca, it may be a store
- // to the first element. Just ignore the store in this case and normal SROA
- // will handle it.
- if (!isa<IntegerType>(SrcVal->getType()) ||
- TD->getTypeAllocSizeInBits(SrcVal->getType()) != AllocaSizeBits)
- return;
// Handle tail padding by extending the operand
if (TD->getTypeSizeInBits(SrcVal->getType()) != AllocaSizeBits)
SrcVal = new ZExtInst(SrcVal,
- Context->getIntegerType(AllocaSizeBits), "", SI);
+ IntegerType::get(SI->getContext(), AllocaSizeBits),
+ "", SI);
- DOUT << "PROMOTING STORE TO WHOLE ALLOCA: " << *AI << *SI;
+ DEBUG(dbgs() << "PROMOTING STORE TO WHOLE ALLOCA: " << *AI << '\n' << *SI
+ << '\n');
// There are two forms here: AI could be an array or struct. Both cases
// have different ways to compute the element offset.
Value *EltVal = SrcVal;
if (Shift) {
- Value *ShiftVal = Context->getConstantInt(EltVal->getType(), Shift);
+ Value *ShiftVal = ConstantInt::get(EltVal->getType(), Shift);
EltVal = BinaryOperator::CreateLShr(EltVal, ShiftVal,
"sroa.store.elt", SI);
}
if (FieldSizeBits != AllocaSizeBits)
EltVal = new TruncInst(EltVal,
- Context->getIntegerType(FieldSizeBits), "", SI);
+ IntegerType::get(SI->getContext(), FieldSizeBits),
+ "", SI);
Value *DestField = NewElts[i];
if (EltVal->getType() == FieldTy) {
// Storing to an integer field of this size, just do it.
} else {
// Otherwise, bitcast the dest pointer (for aggregates).
DestField = new BitCastInst(DestField,
- Context->getPointerTypeUnqual(EltVal->getType()),
+ PointerType::getUnqual(EltVal->getType()),
"", SI);
}
new StoreInst(EltVal, DestField, SI);
Value *EltVal = SrcVal;
if (Shift) {
- Value *ShiftVal = Context->getConstantInt(EltVal->getType(), Shift);
+ Value *ShiftVal = ConstantInt::get(EltVal->getType(), Shift);
EltVal = BinaryOperator::CreateLShr(EltVal, ShiftVal,
"sroa.store.elt", SI);
}
// Truncate down to an integer of the right size.
if (ElementSizeBits != AllocaSizeBits)
EltVal = new TruncInst(EltVal,
- Context->getIntegerType(ElementSizeBits),"",SI);
+ IntegerType::get(SI->getContext(),
+ ElementSizeBits),"",SI);
Value *DestField = NewElts[i];
if (EltVal->getType() == ArrayEltTy) {
// Storing to an integer field of this size, just do it.
} else {
// Otherwise, bitcast the dest pointer (for aggregates).
DestField = new BitCastInst(DestField,
- Context->getPointerTypeUnqual(EltVal->getType()),
+ PointerType::getUnqual(EltVal->getType()),
"", SI);
}
new StoreInst(EltVal, DestField, SI);
}
}
- SI->eraseFromParent();
+ DeadInsts.push_back(SI);
}
-/// RewriteLoadUserOfWholeAlloca - We found an load of the entire allocation to
+/// RewriteLoadUserOfWholeAlloca - We found a load of the entire allocation to
/// an integer. Load the individual pieces to form the aggregate value.
-void SROA::RewriteLoadUserOfWholeAlloca(LoadInst *LI, AllocationInst *AI,
+void SROA::RewriteLoadUserOfWholeAlloca(LoadInst *LI, AllocaInst *AI,
SmallVector<AllocaInst*, 32> &NewElts) {
// Extract each element out of the NewElts according to its structure offset
// and form the result value.
- const Type *AllocaEltTy = AI->getType()->getElementType();
+ const Type *AllocaEltTy = AI->getAllocatedType();
uint64_t AllocaSizeBits = TD->getTypeAllocSizeInBits(AllocaEltTy);
- // If this isn't a load of the whole alloca to an integer, it may be a load
- // of the first element. Just ignore the load in this case and normal SROA
- // will handle it.
- if (!isa<IntegerType>(LI->getType()) ||
- TD->getTypeAllocSizeInBits(LI->getType()) != AllocaSizeBits)
- return;
-
- DOUT << "PROMOTING LOAD OF WHOLE ALLOCA: " << *AI << *LI;
+ DEBUG(dbgs() << "PROMOTING LOAD OF WHOLE ALLOCA: " << *AI << '\n' << *LI
+ << '\n');
// There are two forms here: AI could be an array or struct. Both cases
// have different ways to compute the element offset.
const Type *ArrayEltTy = cast<ArrayType>(AllocaEltTy)->getElementType();
ArrayEltBitOffset = TD->getTypeAllocSizeInBits(ArrayEltTy);
}
-
- Value *ResultVal =
- Context->getNullValue(Context->getIntegerType(AllocaSizeBits));
+
+ Value *ResultVal =
+ Constant::getNullValue(IntegerType::get(LI->getContext(), AllocaSizeBits));
for (unsigned i = 0, e = NewElts.size(); i != e; ++i) {
// Load the value from the alloca. If the NewElt is an aggregate, cast
// Ignore zero sized fields like {}, they obviously contain no data.
if (FieldSizeBits == 0) continue;
- const IntegerType *FieldIntTy = Context->getIntegerType(FieldSizeBits);
+ const IntegerType *FieldIntTy = IntegerType::get(LI->getContext(),
+ FieldSizeBits);
if (!isa<IntegerType>(FieldTy) && !FieldTy->isFloatingPoint() &&
!isa<VectorType>(FieldTy))
SrcField = new BitCastInst(SrcField,
- Context->getPointerTypeUnqual(FieldIntTy),
+ PointerType::getUnqual(FieldIntTy),
"", LI);
SrcField = new LoadInst(SrcField, "sroa.load.elt", LI);
Shift = AllocaSizeBits-Shift-FieldIntTy->getBitWidth();
if (Shift) {
- Value *ShiftVal = Context->getConstantInt(SrcField->getType(), Shift);
+ Value *ShiftVal = ConstantInt::get(SrcField->getType(), Shift);
SrcField = BinaryOperator::CreateShl(SrcField, ShiftVal, "", LI);
}
ResultVal = new TruncInst(ResultVal, LI->getType(), "", LI);
LI->replaceAllUsesWith(ResultVal);
- LI->eraseFromParent();
+ DeadInsts.push_back(LI);
}
-
/// HasPadding - Return true if the specified type has any structure or
/// alignment padding, false otherwise.
static bool HasPadding(const Type *Ty, const TargetData &TD) {
/// isSafeStructAllocaToScalarRepl - Check to see if the specified allocation of
/// an aggregate can be broken down into elements. Return 0 if not, 3 if safe,
/// or 1 if safe after canonicalization has been performed.
-///
-int SROA::isSafeAllocaToScalarRepl(AllocationInst *AI) {
+int SROA::isSafeAllocaToScalarRepl(AllocaInst *AI) {
// Loop over the use list of the alloca. We can only transform it if all of
// the users are safe to transform.
AllocaInfo Info;
- for (Value::use_iterator I = AI->use_begin(), E = AI->use_end();
- I != E; ++I) {
- isSafeUseOfAllocation(cast<Instruction>(*I), AI, Info);
- if (Info.isUnsafe) {
- DOUT << "Cannot transform: " << *AI << " due to user: " << **I;
- return 0;
- }
+ isSafeForScalarRepl(AI, AI, 0, Info);
+ if (Info.isUnsafe) {
+ DEBUG(dbgs() << "Cannot transform: " << *AI << '\n');
+ return 0;
}
// Okay, we know all the users are promotable. If the aggregate is a memcpy
// types, but may actually be used. In these cases, we refuse to promote the
// struct.
if (Info.isMemCpySrc && Info.isMemCpyDst &&
- HasPadding(AI->getType()->getElementType(), *TD))
+ HasPadding(AI->getAllocatedType(), *TD))
return 0;
// If we require cleanup, return 1, otherwise return 3.
return Info.needsCleanup ? 1 : 3;
}
-/// CleanupGEP - GEP is used by an Alloca, which can be prompted after the GEP
-/// is canonicalized here.
-void SROA::CleanupGEP(GetElementPtrInst *GEPI) {
- gep_type_iterator I = gep_type_begin(GEPI);
- ++I;
-
- const ArrayType *AT = dyn_cast<ArrayType>(*I);
- if (!AT)
- return;
-
- uint64_t NumElements = AT->getNumElements();
-
- if (isa<ConstantInt>(I.getOperand()))
- return;
-
- if (NumElements == 1) {
- GEPI->setOperand(2, Context->getNullValue(Type::Int32Ty));
- return;
- }
-
- assert(NumElements == 2 && "Unhandled case!");
- // All users of the GEP must be loads. At each use of the GEP, insert
- // two loads of the appropriate indexed GEP and select between them.
- Value *IsOne = new ICmpInst(ICmpInst::ICMP_NE, I.getOperand(),
- Context->getNullValue(I.getOperand()->getType()),
- "isone", GEPI);
- // Insert the new GEP instructions, which are properly indexed.
- SmallVector<Value*, 8> Indices(GEPI->op_begin()+1, GEPI->op_end());
- Indices[1] = Context->getNullValue(Type::Int32Ty);
- Value *ZeroIdx = GetElementPtrInst::Create(GEPI->getOperand(0),
- Indices.begin(),
- Indices.end(),
- GEPI->getName()+".0", GEPI);
- Indices[1] = Context->getConstantInt(Type::Int32Ty, 1);
- Value *OneIdx = GetElementPtrInst::Create(GEPI->getOperand(0),
- Indices.begin(),
- Indices.end(),
- GEPI->getName()+".1", GEPI);
- // Replace all loads of the variable index GEP with loads from both
- // indexes and a select.
- while (!GEPI->use_empty()) {
- LoadInst *LI = cast<LoadInst>(GEPI->use_back());
- Value *Zero = new LoadInst(ZeroIdx, LI->getName()+".0", LI);
- Value *One = new LoadInst(OneIdx , LI->getName()+".1", LI);
- Value *R = SelectInst::Create(IsOne, One, Zero, LI->getName(), LI);
- LI->replaceAllUsesWith(R);
- LI->eraseFromParent();
- }
- GEPI->eraseFromParent();
-}
-
-
/// CleanupAllocaUsers - If SROA reported that it can promote the specified
/// allocation, but only if cleaned up, perform the cleanups required.
-void SROA::CleanupAllocaUsers(AllocationInst *AI) {
- // At this point, we know that the end result will be SROA'd and promoted, so
- // we can insert ugly code if required so long as sroa+mem2reg will clean it
- // up.
- for (Value::use_iterator UI = AI->use_begin(), E = AI->use_end();
+void SROA::CleanupAllocaUsers(Value *V) {
+ for (Value::use_iterator UI = V->use_begin(), E = V->use_end();
UI != E; ) {
User *U = *UI++;
- if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(U))
- CleanupGEP(GEPI);
- else {
- Instruction *I = cast<Instruction>(U);
- SmallVector<DbgInfoIntrinsic *, 2> DbgInUses;
- if (!isa<StoreInst>(I) && OnlyUsedByDbgInfoIntrinsics(I, &DbgInUses)) {
- // Safe to remove debug info uses.
- while (!DbgInUses.empty()) {
- DbgInfoIntrinsic *DI = DbgInUses.back(); DbgInUses.pop_back();
- DI->eraseFromParent();
- }
- I->eraseFromParent();
+ Instruction *I = cast<Instruction>(U);
+ SmallVector<DbgInfoIntrinsic *, 2> DbgInUses;
+ if (!isa<StoreInst>(I) && OnlyUsedByDbgInfoIntrinsics(I, &DbgInUses)) {
+ // Safe to remove debug info uses.
+ while (!DbgInUses.empty()) {
+ DbgInfoIntrinsic *DI = DbgInUses.pop_back_val();
+ DI->eraseFromParent();
}
+ I->eraseFromParent();
}
}
}
/// and stores would mutate the memory.
static void MergeInType(const Type *In, uint64_t Offset, const Type *&VecTy,
unsigned AllocaSize, const TargetData &TD,
- LLVMContext* Context) {
+ LLVMContext &Context) {
// If this could be contributing to a vector, analyze it.
- if (VecTy != Type::VoidTy) { // either null or a vector type.
+ if (VecTy != Type::getVoidTy(Context)) { // either null or a vector type.
// If the In type is a vector that is the same size as the alloca, see if it
// matches the existing VecTy.
VecTy = VInTy;
return;
}
- } else if (In == Type::FloatTy || In == Type::DoubleTy ||
+ } else if (In->isFloatTy() || In->isDoubleTy() ||
(isa<IntegerType>(In) && In->getPrimitiveSizeInBits() >= 8 &&
isPowerOf2_32(In->getPrimitiveSizeInBits()))) {
// If we're accessing something that could be an element of a vector, see
cast<VectorType>(VecTy)->getElementType()
->getPrimitiveSizeInBits()/8 == EltSize)) {
if (VecTy == 0)
- VecTy = Context->getVectorType(In, AllocaSize/EltSize);
+ VecTy = VectorType::get(In, AllocaSize/EltSize);
return;
}
}
// Otherwise, we have a case that we can't handle with an optimized vector
// form. We can still turn this into a large integer.
- VecTy = Type::VoidTy;
+ VecTy = Type::getVoidTy(Context);
}
/// CanConvertToScalar - V is a pointer. If we can convert the pointee and all
-/// its accesses to use a to single vector type, return true, and set VecTy to
+/// its accesses to a single vector type, return true and set VecTy to
/// the new type. If we could convert the alloca into a single promotable
/// integer, return true but set VecTy to VoidTy. Further, if the use is not a
/// completely trivial use that mem2reg could promote, set IsNotTrivial. Offset
///
/// If we see at least one access to the value that is as a vector type, set the
/// SawVec flag.
-///
bool SROA::CanConvertToScalar(Value *V, bool &IsNotTrivial, const Type *&VecTy,
bool &SawVec, uint64_t Offset,
unsigned AllocaSize) {
// Don't break volatile loads.
if (LI->isVolatile())
return false;
- MergeInType(LI->getType(), Offset, VecTy, AllocaSize, *TD, Context);
+ MergeInType(LI->getType(), Offset, VecTy,
+ AllocaSize, *TD, V->getContext());
SawVec |= isa<VectorType>(LI->getType());
continue;
}
// Storing the pointer, not into the value?
if (SI->getOperand(0) == V || SI->isVolatile()) return 0;
MergeInType(SI->getOperand(0)->getType(), Offset,
- VecTy, AllocaSize, *TD, Context);
+ VecTy, AllocaSize, *TD, V->getContext());
SawVec |= isa<VectorType>(SI->getOperand(0)->getType());
continue;
}
// Compute the offset that this GEP adds to the pointer.
SmallVector<Value*, 8> Indices(GEP->op_begin()+1, GEP->op_end());
- uint64_t GEPOffset = TD->getIndexedOffset(GEP->getOperand(0)->getType(),
+ uint64_t GEPOffset = TD->getIndexedOffset(GEP->getPointerOperandType(),
&Indices[0], Indices.size());
// See if all uses can be converted.
if (!CanConvertToScalar(GEP, IsNotTrivial, VecTy, SawVec,Offset+GEPOffset,
return true;
}
-
/// ConvertUsesToScalar - Convert all of the users of Ptr to use the new alloca
/// directly. This happens when we are converting an "integer union" to a
/// single integer scalar, or when we are converting a "vector union" to a
if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(User)) {
// Compute the offset that this GEP adds to the pointer.
SmallVector<Value*, 8> Indices(GEP->op_begin()+1, GEP->op_end());
- uint64_t GEPOffset = TD->getIndexedOffset(GEP->getOperand(0)->getType(),
+ uint64_t GEPOffset = TD->getIndexedOffset(GEP->getPointerOperandType(),
&Indices[0], Indices.size());
ConvertUsesToScalar(GEP, NewAI, Offset+GEPOffset*8);
GEP->eraseFromParent();
if (StoreInst *SI = dyn_cast<StoreInst>(User)) {
assert(SI->getOperand(0) != Ptr && "Consistency error!");
- Value *Old = Builder.CreateLoad(NewAI, (NewAI->getName()+".in").c_str());
+ Instruction *Old = Builder.CreateLoad(NewAI, NewAI->getName()+".in");
Value *New = ConvertScalar_InsertValue(SI->getOperand(0), Old, Offset,
Builder);
Builder.CreateStore(New, NewAI);
SI->eraseFromParent();
+
+ // If the load we just inserted is now dead, then the inserted store
+ // overwrote the entire thing.
+ if (Old->use_empty())
+ Old->eraseFromParent();
continue;
}
for (unsigned i = 1; i != NumBytes; ++i)
APVal |= APVal << 8;
- Value *Old = Builder.CreateLoad(NewAI, (NewAI->getName()+".in").c_str());
- Value *New = ConvertScalar_InsertValue(Context->getConstantInt(APVal),
+ Instruction *Old = Builder.CreateLoad(NewAI, NewAI->getName()+".in");
+ Value *New = ConvertScalar_InsertValue(
+ ConstantInt::get(User->getContext(), APVal),
Old, Offset, Builder);
Builder.CreateStore(New, NewAI);
+
+ // If the load we just inserted is now dead, then the memset overwrote
+ // the entire thing.
+ if (Old->use_empty())
+ Old->eraseFromParent();
}
MSI->eraseFromParent();
continue;
continue;
}
- assert(0 && "Unsupported operation!");
- abort();
+ llvm_unreachable("Unsupported operation!");
}
}
assert(EltSize*Elt == Offset && "Invalid modulus in validity checking");
}
// Return the element extracted out of it.
- Value *V = Builder.CreateExtractElement(FromVal,
- Context->getConstantInt(Type::Int32Ty,Elt),
- "tmp");
+ Value *V = Builder.CreateExtractElement(FromVal, ConstantInt::get(
+ Type::getInt32Ty(FromVal->getContext()), Elt), "tmp");
if (V->getType() != ToType)
V = Builder.CreateBitCast(V, ToType, "tmp");
return V;
// use insertvalue's to form the FCA.
if (const StructType *ST = dyn_cast<StructType>(ToType)) {
const StructLayout &Layout = *TD->getStructLayout(ST);
- Value *Res = Context->getUndef(ST);
+ Value *Res = UndefValue::get(ST);
for (unsigned i = 0, e = ST->getNumElements(); i != e; ++i) {
Value *Elt = ConvertScalar_ExtractValue(FromVal, ST->getElementType(i),
Offset+Layout.getElementOffsetInBits(i),
if (const ArrayType *AT = dyn_cast<ArrayType>(ToType)) {
uint64_t EltSize = TD->getTypeAllocSizeInBits(AT->getElementType());
- Value *Res = Context->getUndef(AT);
+ Value *Res = UndefValue::get(AT);
for (unsigned i = 0, e = AT->getNumElements(); i != e; ++i) {
Value *Elt = ConvertScalar_ExtractValue(FromVal, AT->getElementType(),
Offset+i*EltSize, Builder);
// only some bits are used.
if (ShAmt > 0 && (unsigned)ShAmt < NTy->getBitWidth())
FromVal = Builder.CreateLShr(FromVal,
- Context->getConstantInt(FromVal->getType(),
+ ConstantInt::get(FromVal->getType(),
ShAmt), "tmp");
else if (ShAmt < 0 && (unsigned)-ShAmt < NTy->getBitWidth())
FromVal = Builder.CreateShl(FromVal,
- Context->getConstantInt(FromVal->getType(),
+ ConstantInt::get(FromVal->getType(),
-ShAmt), "tmp");
// Finally, unconditionally truncate the integer to the right width.
unsigned LIBitWidth = TD->getTypeSizeInBits(ToType);
if (LIBitWidth < NTy->getBitWidth())
FromVal =
- Builder.CreateTrunc(FromVal, Context->getIntegerType(LIBitWidth), "tmp");
+ Builder.CreateTrunc(FromVal, IntegerType::get(FromVal->getContext(),
+ LIBitWidth), "tmp");
else if (LIBitWidth > NTy->getBitWidth())
FromVal =
- Builder.CreateZExt(FromVal, Context->getIntegerType(LIBitWidth), "tmp");
+ Builder.CreateZExt(FromVal, IntegerType::get(FromVal->getContext(),
+ LIBitWidth), "tmp");
// If the result is an integer, this is a trunc or bitcast.
if (isa<IntegerType>(ToType)) {
return FromVal;
}
-
/// ConvertScalar_InsertValue - Insert the value "SV" into the existing integer
/// or vector value "Old" at the offset specified by Offset.
///
// Convert the stored type to the actual type, shift it left to insert
// then 'or' into place.
const Type *AllocaType = Old->getType();
+ LLVMContext &Context = Old->getContext();
if (const VectorType *VTy = dyn_cast<VectorType>(AllocaType)) {
uint64_t VecSize = TD->getTypeAllocSizeInBits(VTy);
SV = Builder.CreateBitCast(SV, VTy->getElementType(), "tmp");
SV = Builder.CreateInsertElement(Old, SV,
- Context->getConstantInt(Type::Int32Ty, Elt),
+ ConstantInt::get(Type::getInt32Ty(SV->getContext()), Elt),
"tmp");
return SV;
}
unsigned SrcStoreWidth = TD->getTypeStoreSizeInBits(SV->getType());
unsigned DestStoreWidth = TD->getTypeStoreSizeInBits(AllocaType);
if (SV->getType()->isFloatingPoint() || isa<VectorType>(SV->getType()))
- SV = Builder.CreateBitCast(SV, Context->getIntegerType(SrcWidth), "tmp");
+ SV = Builder.CreateBitCast(SV,
+ IntegerType::get(SV->getContext(),SrcWidth), "tmp");
else if (isa<PointerType>(SV->getType()))
- SV = Builder.CreatePtrToInt(SV, TD->getIntPtrType(), "tmp");
+ SV = Builder.CreatePtrToInt(SV, TD->getIntPtrType(SV->getContext()), "tmp");
// Zero extend or truncate the value if needed.
if (SV->getType() != AllocaType) {
// only some bits in the structure are set.
APInt Mask(APInt::getLowBitsSet(DestWidth, SrcWidth));
if (ShAmt > 0 && (unsigned)ShAmt < DestWidth) {
- SV = Builder.CreateShl(SV, Context->getConstantInt(SV->getType(),
+ SV = Builder.CreateShl(SV, ConstantInt::get(SV->getType(),
ShAmt), "tmp");
Mask <<= ShAmt;
} else if (ShAmt < 0 && (unsigned)-ShAmt < DestWidth) {
- SV = Builder.CreateLShr(SV, Context->getConstantInt(SV->getType(),
+ SV = Builder.CreateLShr(SV, ConstantInt::get(SV->getType(),
-ShAmt), "tmp");
Mask = Mask.lshr(-ShAmt);
}
// in the new bits.
if (SrcWidth != DestWidth) {
assert(DestWidth > SrcWidth);
- Old = Builder.CreateAnd(Old, Context->getConstantInt(~Mask), "mask");
+ Old = Builder.CreateAnd(Old, ConstantInt::get(Context, ~Mask), "mask");
SV = Builder.CreateOr(Old, SV, "ins");
}
return SV;
/// isOnlyCopiedFromConstantGlobal - Return true if the specified alloca is only
/// modified by a copy from a constant global. If we can prove this, we can
/// replace any uses of the alloca with uses of the global directly.
-Instruction *SROA::isOnlyCopiedFromConstantGlobal(AllocationInst *AI) {
+Instruction *SROA::isOnlyCopiedFromConstantGlobal(AllocaInst *AI) {
Instruction *TheCopy = 0;
if (::isOnlyCopiedFromConstantGlobal(AI, TheCopy, false))
return TheCopy;