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//==- HexagonTargetTransformInfo.cpp - Hexagon specific TTI pass -*- C++ -*-==//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
/// \file
/// This file implements a TargetTransformInfo analysis pass specific to the
/// Hexagon target machine. It uses the target's detailed information to provide
/// more precise answers to certain TTI queries, while letting the target
/// independent and default TTI implementations handle the rest.
#include "Hexagon.h"
#include "HexagonSubtarget.h"
#include "HexagonTargetMachine.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/CodeGen/BasicTTIImpl.h"
#include "llvm/IR/Function.h"
namespace llvm {
class Loop;
class ScalarEvolution;
class User;
class Value;
class HexagonTTIImpl : public BasicTTIImplBase<HexagonTTIImpl> {
using BaseT = BasicTTIImplBase<HexagonTTIImpl>;
using TTI = TargetTransformInfo;
friend BaseT;
const HexagonSubtarget *ST;
const HexagonTargetLowering *TLI;
const HexagonSubtarget *getST() const { return ST; }
const HexagonTargetLowering *getTLI() const { return TLI; }
explicit HexagonTTIImpl(const HexagonTargetMachine *TM, const Function &F)
: BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
TLI(ST->getTargetLowering()) {}
/// \name Scalar TTI Implementations
/// @{
TTI::PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) const;
// The Hexagon target can unroll loops with run-time trip counts.
void getUnrollingPreferences(Loop *L, ScalarEvolution &SE,
TTI::UnrollingPreferences &UP);
// L1 cache prefetch.
unsigned getPrefetchDistance() const;
unsigned getCacheLineSize() const;
/// @}
/// \name Vector TTI Implementations
/// @{
unsigned getNumberOfRegisters(bool vector) const;
/// @}
int getUserCost(const User *U, ArrayRef<const Value *> Operands);
// Hexagon specific decision to generate a lookup table.
bool shouldBuildLookupTables() const;
} // end namespace llvm