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-rw-r--r--polly/lib/CodeGen/CodeGeneration.cpp826
1 files changed, 2 insertions, 824 deletions
diff --git a/polly/lib/CodeGen/CodeGeneration.cpp b/polly/lib/CodeGen/CodeGeneration.cpp
index 7edd1361837..b91d0203dc1 100644
--- a/polly/lib/CodeGen/CodeGeneration.cpp
+++ b/polly/lib/CodeGen/CodeGeneration.cpp
@@ -28,8 +28,9 @@
#include "polly/LinkAllPasses.h"
#include "polly/ScopInfo.h"
#include "polly/TempScopInfo.h"
-#include "polly/Support/GICHelper.h"
+#include "polly/BlockGenerators.h"
#include "polly/LoopGenerators.h"
+#include "polly/Support/GICHelper.h"
#include "llvm/Module.h"
#include "llvm/ADT/SetVector.h"
@@ -38,7 +39,6 @@
#include "llvm/Analysis/ScalarEvolutionExpander.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
-#include "llvm/Support/IRBuilder.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
@@ -78,829 +78,7 @@ AtLeastOnce("enable-polly-atLeastOnce",
cl::value_desc("OpenMP code generation enabled if true"),
cl::init(false), cl::ZeroOrMore);
-static cl::opt<bool>
-Aligned("enable-polly-aligned",
- cl::desc("Assumed aligned memory accesses."), cl::Hidden,
- cl::value_desc("OpenMP code generation enabled if true"),
- cl::init(false), cl::ZeroOrMore);
-
-static cl::opt<bool>
-GroupedUnrolling("enable-polly-grouped-unroll",
- cl::desc("Perform grouped unrolling, but don't generate SIMD "
- "instuctions"), cl::Hidden, cl::init(false),
- cl::ZeroOrMore);
-
-typedef DenseMap<const Value*, Value*> ValueMapT;
typedef DenseMap<const char*, Value*> CharMapT;
-typedef std::vector<ValueMapT> VectorValueMapT;
-
-class IslGenerator {
-public:
- IslGenerator(IRBuilder<> &Builder, std::vector<Value *> &IVS) :
- Builder(Builder), IVS(IVS) {}
- Value *generateIslInt(__isl_take isl_int Int);
- Value *generateIslAff(__isl_take isl_aff *Aff);
- Value *generateIslPwAff(__isl_take isl_pw_aff *PwAff);
-
-private:
- typedef struct {
- Value *Result;
- class IslGenerator *Generator;
- } IslGenInfo;
-
- IRBuilder<> &Builder;
- std::vector<Value *> &IVS;
- static int mergeIslAffValues(__isl_take isl_set *Set,
- __isl_take isl_aff *Aff, void *User);
-};
-
-Value *IslGenerator::generateIslInt(isl_int Int) {
- mpz_t IntMPZ;
- mpz_init(IntMPZ);
- isl_int_get_gmp(Int, IntMPZ);
- Value *IntValue = Builder.getInt(APInt_from_MPZ(IntMPZ));
- mpz_clear(IntMPZ);
- return IntValue;
-}
-
-Value *IslGenerator::generateIslAff(__isl_take isl_aff *Aff) {
- Value *Result;
- Value *ConstValue;
- isl_int ConstIsl;
-
- isl_int_init(ConstIsl);
- isl_aff_get_constant(Aff, &ConstIsl);
- ConstValue = generateIslInt(ConstIsl);
- Type *Ty = Builder.getInt64Ty();
-
- // FIXME: We should give the constant and coefficients the right type. Here
- // we force it into i64.
- Result = Builder.CreateSExtOrBitCast(ConstValue, Ty);
-
- unsigned int NbInputDims = isl_aff_dim(Aff, isl_dim_in);
-
- assert((IVS.size() == NbInputDims) && "The Dimension of Induction Variables"
- "must match the dimension of the affine space.");
-
- isl_int CoefficientIsl;
- isl_int_init(CoefficientIsl);
-
- for (unsigned int i = 0; i < NbInputDims; ++i) {
- Value *CoefficientValue;
- isl_aff_get_coefficient(Aff, isl_dim_in, i, &CoefficientIsl);
-
- if (isl_int_is_zero(CoefficientIsl))
- continue;
-
- CoefficientValue = generateIslInt(CoefficientIsl);
- CoefficientValue = Builder.CreateIntCast(CoefficientValue, Ty, true);
- Value *IV = Builder.CreateIntCast(IVS[i], Ty, true);
- Value *PAdd = Builder.CreateMul(CoefficientValue, IV, "p_mul_coeff");
- Result = Builder.CreateAdd(Result, PAdd, "p_sum_coeff");
- }
-
- isl_int_clear(CoefficientIsl);
- isl_int_clear(ConstIsl);
- isl_aff_free(Aff);
-
- return Result;
-}
-
-int IslGenerator::mergeIslAffValues(__isl_take isl_set *Set,
- __isl_take isl_aff *Aff, void *User) {
- IslGenInfo *GenInfo = (IslGenInfo *)User;
-
- assert((GenInfo->Result == NULL) && "Result is already set."
- "Currently only single isl_aff is supported");
- assert(isl_set_plain_is_universe(Set)
- && "Code generation failed because the set is not universe");
-
- GenInfo->Result = GenInfo->Generator->generateIslAff(Aff);
-
- isl_set_free(Set);
- return 0;
-}
-
-Value *IslGenerator::generateIslPwAff(__isl_take isl_pw_aff *PwAff) {
- IslGenInfo User;
- User.Result = NULL;
- User.Generator = this;
- isl_pw_aff_foreach_piece(PwAff, mergeIslAffValues, &User);
- assert(User.Result && "Code generation for isl_pw_aff failed");
-
- isl_pw_aff_free(PwAff);
- return User.Result;
-}
-
-/// @brief Generate a new basic block for a polyhedral statement.
-///
-/// The only public function exposed is generate().
-class BlockGenerator {
-public:
- /// @brief Generate a new BasicBlock for a ScopStmt.
- ///
- /// @param Builder The LLVM-IR Builder used to generate the statement. The
- /// code is generated at the location, the Builder points to.
- /// @param Stmt The statement to code generate.
- /// @param GlobalMap A map that defines for certain Values referenced from the
- /// original code new Values they should be replaced with.
- /// @param P A reference to the pass this function is called from.
- /// The pass is needed to update other analysis.
- static void generate(IRBuilder<> &Builder, ScopStmt &Stmt,
- ValueMapT &GlobalMap, Pass *P) {
- BlockGenerator Generator(Builder, Stmt, P);
- Generator.copyBB(GlobalMap);
- }
-
-protected:
- IRBuilder<> &Builder;
- ScopStmt &Statement;
- Pass *P;
-
- BlockGenerator(IRBuilder<> &B, ScopStmt &Stmt, Pass *P);
-
- /// @brief Get the new version of a Value.
- ///
- /// @param Old The old Value.
- /// @param BBMap A mapping from old values to their new values
- /// (for values recalculated within this basic block).
- /// @param GlobalMap A mapping from old values to their new values
- /// (for values recalculated in the new ScoP, but not
- /// within this basic block).
- ///
- /// @returns o The old value, if it is still valid.
- /// o The new value, if available.
- /// o NULL, if no value is found.
- Value *getNewValue(const Value *Old, ValueMapT &BBMap, ValueMapT &GlobalMap);
-
- void copyInstScalar(const Instruction *Inst, ValueMapT &BBMap,
- ValueMapT &GlobalMap);
-
- /// @brief Get the memory access offset to be added to the base address
- std::vector<Value*> getMemoryAccessIndex(__isl_keep isl_map *AccessRelation,
- Value *BaseAddress, ValueMapT &BBMap,
- ValueMapT &GlobalMap);
-
- /// @brief Get the new operand address according to the changed access in
- /// JSCOP file.
- Value *getNewAccessOperand(__isl_keep isl_map *NewAccessRelation,
- Value *BaseAddress, ValueMapT &BBMap,
- ValueMapT &GlobalMap);
-
- /// @brief Generate the operand address
- Value *generateLocationAccessed(const Instruction *Inst,
- const Value *Pointer, ValueMapT &BBMap,
- ValueMapT &GlobalMap);
-
- Value *generateScalarLoad(const LoadInst *load, ValueMapT &BBMap,
- ValueMapT &GlobalMap);
-
- Value *generateScalarStore(const StoreInst *store, ValueMapT &BBMap,
- ValueMapT &GlobalMap);
-
- /// @brief Copy a single Instruction.
- ///
- /// This copies a single Instruction and updates references to old values
- /// with references to new values, as defined by GlobalMap and BBMap.
- ///
- /// @param BBMap A mapping from old values to their new values
- /// (for values recalculated within this basic block).
- /// @param GlobalMap A mapping from old values to their new values
- /// (for values recalculated in the new ScoP, but not
- /// within this basic block).
- void copyInstruction(const Instruction *Inst, ValueMapT &BBMap,
- ValueMapT &GlobalMap);
-
- /// @brief Copy the basic block.
- ///
- /// This copies the entire basic block and updates references to old values
- /// with references to new values, as defined by GlobalMap.
- ///
- /// @param GlobalMap A mapping from old values to their new values
- /// (for values recalculated in the new ScoP, but not
- /// within this basic block).
- void copyBB(ValueMapT &GlobalMap);
-};
-
-BlockGenerator::BlockGenerator(IRBuilder<> &B, ScopStmt &Stmt, Pass *P):
- Builder(B), Statement(Stmt), P(P) {}
-
-Value *BlockGenerator::getNewValue(const Value *Old, ValueMapT &BBMap,
- ValueMapT &GlobalMap) {
- // We assume constants never change.
- // This avoids map lookups for many calls to this function.
- if (isa<Constant>(Old))
- return const_cast<Value*>(Old);
-
- if (GlobalMap.count(Old)) {
- Value *New = GlobalMap[Old];
-
- if (Old->getType()->getScalarSizeInBits()
- < New->getType()->getScalarSizeInBits())
- New = Builder.CreateTruncOrBitCast(New, Old->getType());
-
- return New;
- }
-
- if (BBMap.count(Old)) {
- return BBMap[Old];
- }
-
- // 'Old' is within the original SCoP, but was not rewritten.
- //
- // Such values appear, if they only calculate information already available in
- // the polyhedral description (e.g. an induction variable increment). They
- // can be safely ignored.
- if (const Instruction *Inst = dyn_cast<Instruction>(Old))
- if (Statement.getParent()->getRegion().contains(Inst->getParent()))
- return NULL;
-
- // Everything else is probably a scop-constant value defined as global,
- // function parameter or an instruction not within the scop.
- return const_cast<Value*>(Old);
-}
-
-void BlockGenerator::copyInstScalar(const Instruction *Inst, ValueMapT &BBMap,
- ValueMapT &GlobalMap) {
- Instruction *NewInst = Inst->clone();
-
- // Replace old operands with the new ones.
- for (Instruction::const_op_iterator OI = Inst->op_begin(),
- OE = Inst->op_end(); OI != OE; ++OI) {
- Value *OldOperand = *OI;
- Value *NewOperand = getNewValue(OldOperand, BBMap, GlobalMap);
-
- if (!NewOperand) {
- assert(!isa<StoreInst>(NewInst)
- && "Store instructions are always needed!");
- delete NewInst;
- return;
- }
-
- NewInst->replaceUsesOfWith(OldOperand, NewOperand);
- }
-
- Builder.Insert(NewInst);
- BBMap[Inst] = NewInst;
-
- if (!NewInst->getType()->isVoidTy())
- NewInst->setName("p_" + Inst->getName());
-}
-
-std::vector<Value*> BlockGenerator::getMemoryAccessIndex(
- __isl_keep isl_map *AccessRelation, Value *BaseAddress,
- ValueMapT &BBMap, ValueMapT &GlobalMap) {
-
- assert((isl_map_dim(AccessRelation, isl_dim_out) == 1)
- && "Only single dimensional access functions supported");
-
- std::vector<Value *> IVS;
- for (unsigned i = 0; i < Statement.getNumIterators(); ++i) {
- const Value *OriginalIV = Statement.getInductionVariableForDimension(i);
- Value *NewIV = getNewValue(OriginalIV, BBMap, GlobalMap);
- IVS.push_back(NewIV);
- }
-
- isl_pw_aff *PwAff = isl_map_dim_max(isl_map_copy(AccessRelation), 0);
- IslGenerator IslGen(Builder, IVS);
- Value *OffsetValue = IslGen.generateIslPwAff(PwAff);
-
- Type *Ty = Builder.getInt64Ty();
- OffsetValue = Builder.CreateIntCast(OffsetValue, Ty, true);
-
- std::vector<Value*> IndexArray;
- Value *NullValue = Constant::getNullValue(Ty);
- IndexArray.push_back(NullValue);
- IndexArray.push_back(OffsetValue);
- return IndexArray;
-}
-
-Value *BlockGenerator::getNewAccessOperand(
- __isl_keep isl_map *NewAccessRelation, Value *BaseAddress,
- ValueMapT &BBMap, ValueMapT &GlobalMap) {
- std::vector<Value*> IndexArray = getMemoryAccessIndex(NewAccessRelation,
- BaseAddress,
- BBMap, GlobalMap);
- Value *NewOperand = Builder.CreateGEP(BaseAddress, IndexArray,
- "p_newarrayidx_");
- return NewOperand;
-}
-
-Value *BlockGenerator::generateLocationAccessed(const Instruction *Inst,
- const Value *Pointer,
- ValueMapT &BBMap,
- ValueMapT &GlobalMap) {
- MemoryAccess &Access = Statement.getAccessFor(Inst);
- isl_map *CurrentAccessRelation = Access.getAccessRelation();
- isl_map *NewAccessRelation = Access.getNewAccessRelation();
-
- assert(isl_map_has_equal_space(CurrentAccessRelation, NewAccessRelation)
- && "Current and new access function use different spaces");
-
- Value *NewPointer;
-
- if (!NewAccessRelation) {
- NewPointer = getNewValue(Pointer, BBMap, GlobalMap);
- } else {
- Value *BaseAddress = const_cast<Value*>(Access.getBaseAddr());
- NewPointer = getNewAccessOperand(NewAccessRelation, BaseAddress,
- BBMap, GlobalMap);
- }
-
- isl_map_free(CurrentAccessRelation);
- isl_map_free(NewAccessRelation);
- return NewPointer;
-}
-
-Value *BlockGenerator::generateScalarLoad(const LoadInst *Load,
- ValueMapT &BBMap,
- ValueMapT &GlobalMap) {
- const Value *Pointer = Load->getPointerOperand();
- const Instruction *Inst = dyn_cast<Instruction>(Load);
- Value *NewPointer = generateLocationAccessed(Inst, Pointer, BBMap, GlobalMap);
- Value *ScalarLoad = Builder.CreateLoad(NewPointer,
- Load->getName() + "_p_scalar_");
- return ScalarLoad;
-}
-
-Value *BlockGenerator::generateScalarStore(const StoreInst *Store,
- ValueMapT &BBMap,
- ValueMapT &GlobalMap) {
- const Value *Pointer = Store->getPointerOperand();
- Value *NewPointer = generateLocationAccessed(Store, Pointer, BBMap,
- GlobalMap);
- Value *ValueOperand = getNewValue(Store->getValueOperand(), BBMap, GlobalMap);
-
- return Builder.CreateStore(ValueOperand, NewPointer);
-}
-
-void BlockGenerator::copyInstruction(const Instruction *Inst,
- ValueMapT &BBMap, ValueMapT &GlobalMap) {
- // Terminator instructions control the control flow. They are explicitly
- // expressed in the clast and do not need to be copied.
- if (Inst->isTerminator())
- return;
-
- if (const LoadInst *Load = dyn_cast<LoadInst>(Inst)) {
- BBMap[Load] = generateScalarLoad(Load, BBMap, GlobalMap);
- return;
- }
-
- if (const StoreInst *Store = dyn_cast<StoreInst>(Inst)) {
- BBMap[Store] = generateScalarStore(Store, BBMap, GlobalMap);
- return;
- }
-
- copyInstScalar(Inst, BBMap, GlobalMap);
-}
-
-
-void BlockGenerator::copyBB(ValueMapT &GlobalMap) {
- BasicBlock *BB = Statement.getBasicBlock();
- BasicBlock *CopyBB = SplitBlock(Builder.GetInsertBlock(),
- Builder.GetInsertPoint(), P);
- CopyBB->setName("polly.stmt." + BB->getName());
- Builder.SetInsertPoint(CopyBB->begin());
-
- ValueMapT BBMap;
-
- for (BasicBlock::const_iterator II = BB->begin(), IE = BB->end(); II != IE;
- ++II)
- copyInstruction(II, BBMap, GlobalMap);
-}
-
-/// @brief Generate a new vector basic block for a polyhedral statement.
-///
-/// The only public function exposed is generate().
-class VectorBlockGenerator : BlockGenerator {
-public:
- /// @brief Generate a new vector basic block for a ScoPStmt.
- ///
- /// This code generation is similar to the normal, scalar code generation,
- /// except that each instruction is code generated for several vector lanes
- /// at a time. If possible instructions are issued as actual vector
- /// instructions, but e.g. for address calculation instructions we currently
- /// generate scalar instructions for each vector lane.
- ///
- /// @param Builder The LLVM-IR Builder used to generate the statement. The
- /// code is generated at the location, the builder points
- /// to.
- /// @param Stmt The statement to code generate.
- /// @param GlobalMaps A vector of maps that define for certain Values
- /// referenced from the original code new Values they should
- /// be replaced with. Each map in the vector of maps is
- /// used for one vector lane. The number of elements in the
- /// vector defines the width of the generated vector
- /// instructions.
- /// @param P A reference to the pass this function is called from.
- /// The pass is needed to update other analysis.
- static void generate(IRBuilder<> &B, ScopStmt &Stmt,
- VectorValueMapT &GlobalMaps, __isl_keep isl_set *Domain,
- Pass *P) {
- VectorBlockGenerator Generator(B, GlobalMaps, Stmt, Domain, P);
- Generator.copyBB();
- }
-
-private:
- // This is a vector of global value maps. The first map is used for the first
- // vector lane, ...
- // Each map, contains information about Instructions in the old ScoP, which
- // are recalculated in the new SCoP. When copying the basic block, we replace
- // all referenes to the old instructions with their recalculated values.
- VectorValueMapT &GlobalMaps;
-
- isl_set *Domain;
-
- VectorBlockGenerator(IRBuilder<> &B, VectorValueMapT &GlobalMaps,
- ScopStmt &Stmt, __isl_keep isl_set *Domain, Pass *P);
-
- int getVectorWidth();
-
- Value *getVectorValue(const Value *Old, ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps);
-
- Type *getVectorPtrTy(const Value *V, int Width);
-
- /// @brief Load a vector from a set of adjacent scalars
- ///
- /// In case a set of scalars is known to be next to each other in memory,
- /// create a vector load that loads those scalars
- ///
- /// %vector_ptr= bitcast double* %p to <4 x double>*
- /// %vec_full = load <4 x double>* %vector_ptr
- ///
- Value *generateStrideOneLoad(const LoadInst *Load, ValueMapT &BBMap);
-
- /// @brief Load a vector initialized from a single scalar in memory
- ///
- /// In case all elements of a vector are initialized to the same
- /// scalar value, this value is loaded and shuffeled into all elements
- /// of the vector.
- ///
- /// %splat_one = load <1 x double>* %p
- /// %splat = shufflevector <1 x double> %splat_one, <1 x
- /// double> %splat_one, <4 x i32> zeroinitializer
- ///
- Value *generateStrideZeroLoad(const LoadInst *Load, ValueMapT &BBMap);
-
- /// @Load a vector from scalars distributed in memory
- ///
- /// In case some scalars a distributed randomly in memory. Create a vector
- /// by loading each scalar and by inserting one after the other into the
- /// vector.
- ///
- /// %scalar_1= load double* %p_1
- /// %vec_1 = insertelement <2 x double> undef, double %scalar_1, i32 0
- /// %scalar 2 = load double* %p_2
- /// %vec_2 = insertelement <2 x double> %vec_1, double %scalar_1, i32 1
- ///
- Value *generateUnknownStrideLoad(const LoadInst *Load,
- VectorValueMapT &ScalarMaps);
-
- void generateLoad(const LoadInst *Load, ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps);
-
- void copyUnaryInst(const UnaryInstruction *Inst, ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps);
-
- void copyBinaryInst(const BinaryOperator *Inst, ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps);
-
- void copyStore(const StoreInst *Store, ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps);
-
- void copyInstScalarized(const Instruction *Inst, ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps);
-
- bool extractScalarValues(const Instruction *Inst, ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps);
-
- bool hasVectorOperands(const Instruction *Inst, ValueMapT &VectorMap);
-
- void copyInstruction(const Instruction *Inst, ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps);
-
- void copyBB();
-};
-
-VectorBlockGenerator::VectorBlockGenerator(IRBuilder<> &B,
- VectorValueMapT &GlobalMaps, ScopStmt &Stmt, __isl_keep isl_set *Domain,
- Pass *P) : BlockGenerator(B, Stmt, P), GlobalMaps(GlobalMaps),
- Domain(Domain) {
- assert(GlobalMaps.size() > 1 && "Only one vector lane found");
- assert(Domain && "No statement domain provided");
- }
-
-Value *VectorBlockGenerator::getVectorValue(const Value *Old,
- ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps) {
- if (VectorMap.count(Old))
- return VectorMap[Old];
-
- int Width = getVectorWidth();
-
- Value *Vector = UndefValue::get(VectorType::get(Old->getType(), Width));
-
- for (int Lane = 0; Lane < Width; Lane++)
- Vector = Builder.CreateInsertElement(Vector,
- getNewValue(Old,
- ScalarMaps[Lane],
- GlobalMaps[Lane]),
- Builder.getInt32(Lane));
-
- VectorMap[Old] = Vector;
-
- return Vector;
-}
-
-Type *VectorBlockGenerator::getVectorPtrTy(const Value *Val, int Width) {
- PointerType *PointerTy = dyn_cast<PointerType>(Val->getType());
- assert(PointerTy && "PointerType expected");
-
- Type *ScalarType = PointerTy->getElementType();
- VectorType *VectorType = VectorType::get(ScalarType, Width);
-
- return PointerType::getUnqual(VectorType);
-}
-
-Value *VectorBlockGenerator::generateStrideOneLoad(const LoadInst *Load,
- ValueMapT &BBMap) {
- const Value *Pointer = Load->getPointerOperand();
- Type *VectorPtrType = getVectorPtrTy(Pointer, getVectorWidth());
- Value *NewPointer = getNewValue(Pointer, BBMap, GlobalMaps[0]);
- Value *VectorPtr = Builder.CreateBitCast(NewPointer, VectorPtrType,
- "vector_ptr");
- LoadInst *VecLoad = Builder.CreateLoad(VectorPtr,
- Load->getName() + "_p_vec_full");
- if (!Aligned)
- VecLoad->setAlignment(8);
-
- return VecLoad;
-}
-
-Value *VectorBlockGenerator::generateStrideZeroLoad(const LoadInst *Load,
- ValueMapT &BBMap) {
- const Value *Pointer = Load->getPointerOperand();
- Type *VectorPtrType = getVectorPtrTy(Pointer, 1);
- Value *NewPointer = getNewValue(Pointer, BBMap, GlobalMaps[0]);
- Value *VectorPtr = Builder.CreateBitCast(NewPointer, VectorPtrType,
- Load->getName() + "_p_vec_p");
- LoadInst *ScalarLoad= Builder.CreateLoad(VectorPtr,
- Load->getName() + "_p_splat_one");
-
- if (!Aligned)
- ScalarLoad->setAlignment(8);
-
- Constant *SplatVector =
- Constant::getNullValue(VectorType::get(Builder.getInt32Ty(),
- getVectorWidth()));
-
- Value *VectorLoad = Builder.CreateShuffleVector(ScalarLoad, ScalarLoad,
- SplatVector,
- Load->getName()
- + "_p_splat");
- return VectorLoad;
-}
-
-Value *VectorBlockGenerator::generateUnknownStrideLoad(const LoadInst *Load,
- VectorValueMapT &ScalarMaps) {
- int VectorWidth = getVectorWidth();
- const Value *Pointer = Load->getPointerOperand();
- VectorType *VectorType = VectorType::get(
- dyn_cast<PointerType>(Pointer->getType())->getElementType(), VectorWidth);
-
- Value *Vector = UndefValue::get(VectorType);
-
- for (int i = 0; i < VectorWidth; i++) {
- Value *NewPointer = getNewValue(Pointer, ScalarMaps[i], GlobalMaps[i]);
- Value *ScalarLoad = Builder.CreateLoad(NewPointer,
- Load->getName() + "_p_scalar_");
- Vector = Builder.CreateInsertElement(Vector, ScalarLoad,
- Builder.getInt32(i),
- Load->getName() + "_p_vec_");
- }
-
- return Vector;
-}
-
-void VectorBlockGenerator::generateLoad(const LoadInst *Load,
- ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps) {
- if (GroupedUnrolling || !VectorType::isValidElementType(Load->getType())) {
- for (int i = 0; i < getVectorWidth(); i++)
- ScalarMaps[i][Load] = generateScalarLoad(Load, ScalarMaps[i],
- GlobalMaps[i]);
- return;
- }
-
- MemoryAccess &Access = Statement.getAccessFor(Load);
-
- Value *NewLoad;
- if (Access.isStrideZero(isl_set_copy(Domain)))
- NewLoad = generateStrideZeroLoad(Load, ScalarMaps[0]);
- else if (Access.isStrideOne(isl_set_copy(Domain)))
- NewLoad = generateStrideOneLoad(Load, ScalarMaps[0]);
- else
- NewLoad = generateUnknownStrideLoad(Load, ScalarMaps);
-
- VectorMap[Load] = NewLoad;
-}
-
-void VectorBlockGenerator::copyUnaryInst(const UnaryInstruction *Inst,
- ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps) {
- int VectorWidth = getVectorWidth();
- Value *NewOperand = getVectorValue(Inst->getOperand(0), VectorMap,
- ScalarMaps);
-
- assert(isa<CastInst>(Inst) && "Can not generate vector code for instruction");
-
- const CastInst *Cast = dyn_cast<CastInst>(Inst);
- VectorType *DestType = VectorType::get(Inst->getType(), VectorWidth);
- VectorMap[Inst] = Builder.CreateCast(Cast->getOpcode(), NewOperand, DestType);
-}
-
-void VectorBlockGenerator::copyBinaryInst(const BinaryOperator *Inst,
- ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps) {
- Value *OpZero = Inst->getOperand(0);
- Value *OpOne = Inst->getOperand(1);
-
- Value *NewOpZero, *NewOpOne;
- NewOpZero = getVectorValue(OpZero, VectorMap, ScalarMaps);
- NewOpOne = getVectorValue(OpOne, VectorMap, ScalarMaps);
-
- Value *NewInst = Builder.CreateBinOp(Inst->getOpcode(), NewOpZero,
- NewOpOne,
- Inst->getName() + "p_vec");
- VectorMap[Inst] = NewInst;
-}
-
-void VectorBlockGenerator::copyStore(const StoreInst *Store,
- ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps) {
- int VectorWidth = getVectorWidth();
-
- MemoryAccess &Access = Statement.getAccessFor(Store);
-
- const Value *Pointer = Store->getPointerOperand();
- Value *Vector = getVectorValue(Store->getValueOperand(), VectorMap,
- ScalarMaps);
-
- if (Access.isStrideOne(isl_set_copy(Domain))) {
- Type *VectorPtrType = getVectorPtrTy(Pointer, VectorWidth);
- Value *NewPointer = getNewValue(Pointer, ScalarMaps[0], GlobalMaps[0]);
-
- Value *VectorPtr = Builder.CreateBitCast(NewPointer, VectorPtrType,
- "vector_ptr");
- StoreInst *Store = Builder.CreateStore(Vector, VectorPtr);
-
- if (!Aligned)
- Store->setAlignment(8);
- } else {
- for (unsigned i = 0; i < ScalarMaps.size(); i++) {
- Value *Scalar = Builder.CreateExtractElement(Vector,
- Builder.getInt32(i));
- Value *NewPointer = getNewValue(Pointer, ScalarMaps[i], GlobalMaps[i]);
- Builder.CreateStore(Scalar, NewPointer);
- }
- }
-}
-
-bool VectorBlockGenerator::hasVectorOperands(const Instruction *Inst,
- ValueMapT &VectorMap) {
- for (Instruction::const_op_iterator OI = Inst->op_begin(),
- OE = Inst->op_end(); OI != OE; ++OI)
- if (VectorMap.count(*OI))
- return true;
- return false;
-}
-
-bool VectorBlockGenerator::extractScalarValues(const Instruction *Inst,
- ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps) {
- bool HasVectorOperand = false;
- int VectorWidth = getVectorWidth();
-
- for (Instruction::const_op_iterator OI = Inst->op_begin(),
- OE = Inst->op_end(); OI != OE; ++OI) {
- ValueMapT::iterator VecOp = VectorMap.find(*OI);
-
- if (VecOp == VectorMap.end())
- continue;
-
- HasVectorOperand = true;
- Value *NewVector = VecOp->second;
-
- for (int i = 0; i < VectorWidth; ++i) {
- ValueMapT &SM = ScalarMaps[i];
-
- // If there is one scalar extracted, all scalar elements should have
- // already been extracted by the code here. So no need to check for the
- // existance of all of them.
- if (SM.count(*OI))
- break;
-
- SM[*OI] = Builder.CreateExtractElement(NewVector, Builder.getInt32(i));
- }
- }
-
- return HasVectorOperand;
-}
-
-void VectorBlockGenerator::copyInstScalarized(const Instruction *Inst,
- ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps) {
- bool HasVectorOperand;
- int VectorWidth = getVectorWidth();
-
- HasVectorOperand = extractScalarValues(Inst, VectorMap, ScalarMaps);
-
- for (int VectorLane = 0; VectorLane < getVectorWidth(); VectorLane++)
- copyInstScalar(Inst, ScalarMaps[VectorLane], GlobalMaps[VectorLane]);
-
- if (!VectorType::isValidElementType(Inst->getType()) || !HasVectorOperand)
- return;
-
- // Make the result available as vector value.
- VectorType *VectorType = VectorType::get(Inst->getType(), VectorWidth);
- Value *Vector = UndefValue::get(VectorType);
-
- for (int i = 0; i < VectorWidth; i++)
- Vector = Builder.CreateInsertElement(Vector, ScalarMaps[i][Inst],
- Builder.getInt32(i));
-
- VectorMap[Inst] = Vector;
-}
-
-int VectorBlockGenerator::getVectorWidth() {
- return GlobalMaps.size();
-}
-
-void VectorBlockGenerator::copyInstruction(const Instruction *Inst,
- ValueMapT &VectorMap,
- VectorValueMapT &ScalarMaps) {
- // Terminator instructions control the control flow. They are explicitly
- // expressed in the clast and do not need to be copied.
- if (Inst->isTerminator())
- return;
-
- if (const LoadInst *Load = dyn_cast<LoadInst>(Inst)) {
- generateLoad(Load, VectorMap, ScalarMaps);
- return;
- }
-
- if (hasVectorOperands(Inst, VectorMap)) {
- if (const StoreInst *Store = dyn_cast<StoreInst>(Inst)) {
- copyStore(Store, VectorMap, ScalarMaps);
- return;
- }
-
- if (const UnaryInstruction *Unary = dyn_cast<UnaryInstruction>(Inst)) {
- copyUnaryInst(Unary, VectorMap, ScalarMaps);
- return;
- }
-
- if (const BinaryOperator *Binary = dyn_cast<BinaryOperator>(Inst)) {
- copyBinaryInst(Binary, VectorMap, ScalarMaps);
- return;
- }
-
- // Falltrough: We generate scalar instructions, if we don't know how to
- // generate vector code.
- }
-
- copyInstScalarized(Inst, VectorMap, ScalarMaps);
-}
-
-void VectorBlockGenerator::copyBB() {
- BasicBlock *BB = Statement.getBasicBlock();
- BasicBlock *CopyBB = SplitBlock(Builder.GetInsertBlock(),
- Builder.GetInsertPoint(), P);
- CopyBB->setName("polly.stmt." + BB->getName());
- Builder.SetInsertPoint(CopyBB->begin());
-
- // Create two maps that store the mapping from the original instructions of
- // the old basic block to their copies in the new basic block. Those maps
- // are basic block local.
- //
- // As vector code generation is supported there is one map for scalar values
- // and one for vector values.
- //
- // In case we just do scalar code generation, the vectorMap is not used and
- // the scalarMap has just one dimension, which contains the mapping.
- //
- // In case vector code generation is done, an instruction may either appear
- // in the vector map once (as it is calculating >vectorwidth< values at a
- // time. Or (if the values are calculated using scalar operations), it
- // appears once in every dimension of the scalarMap.
- VectorValueMapT ScalarBlockMap(getVectorWidth());
- ValueMapT VectorBlockMap;
-
- for (BasicBlock::const_iterator II = BB->begin(), IE = BB->end();
- II != IE; ++II)
- copyInstruction(II, VectorBlockMap, ScalarBlockMap);
-}
/// Class to generate LLVM-IR that calculates the value of a clast_expr.
class ClastExpCodeGen {
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