Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/lib/Target/ARM/ARMTargetTransformInfo.h

@@ -0,0 +1,191 @@
+//===- ARMTargetTransformInfo.h - ARM specific TTI --------------*- 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 a TargetTransformInfo::Concept conforming object specific to the
+/// ARM 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.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_ARM_ARMTARGETTRANSFORMINFO_H
+#define LLVM_LIB_TARGET_ARM_ARMTARGETTRANSFORMINFO_H
+
+#include "ARM.h"
+#include "ARMSubtarget.h"
+#include "ARMTargetMachine.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/CodeGen/BasicTTIImpl.h"
+#include "llvm/IR/Constant.h"
+#include "llvm/IR/Function.h"
+#include "llvm/MC/SubtargetFeature.h"
+
+namespace llvm {
+
+class APInt;
+class ARMTargetLowering;
+class Instruction;
+class Loop;
+class SCEV;
+class ScalarEvolution;
+class Type;
+class Value;
+
+class ARMTTIImpl : public BasicTTIImplBase<ARMTTIImpl> {
+  using BaseT = BasicTTIImplBase<ARMTTIImpl>;
+  using TTI = TargetTransformInfo;
+
+  friend BaseT;
+
+  const ARMSubtarget *ST;
+  const ARMTargetLowering *TLI;
+
+  // Currently the following features are excluded from InlineFeatureWhitelist.
+  // ModeThumb, FeatureNoARM, ModeSoftFloat, FeatureVFPOnlySP, FeatureD16
+  // Depending on whether they are set or unset, different
+  // instructions/registers are available. For example, inlining a callee with
+  // -thumb-mode in a caller with +thumb-mode, may cause the assembler to
+  // fail if the callee uses ARM only instructions, e.g. in inline asm.
+  const FeatureBitset InlineFeatureWhitelist = {
+      ARM::FeatureVFP2, ARM::FeatureVFP3, ARM::FeatureNEON, ARM::FeatureThumb2,
+      ARM::FeatureFP16, ARM::FeatureVFP4, ARM::FeatureFPARMv8,
+      ARM::FeatureFullFP16, ARM::FeatureHWDivThumb,
+      ARM::FeatureHWDivARM, ARM::FeatureDB, ARM::FeatureV7Clrex,
+      ARM::FeatureAcquireRelease, ARM::FeatureSlowFPBrcc,
+      ARM::FeaturePerfMon, ARM::FeatureTrustZone, ARM::Feature8MSecExt,
+      ARM::FeatureCrypto, ARM::FeatureCRC, ARM::FeatureRAS,
+      ARM::FeatureFPAO, ARM::FeatureFuseAES, ARM::FeatureZCZeroing,
+      ARM::FeatureProfUnpredicate, ARM::FeatureSlowVGETLNi32,
+      ARM::FeatureSlowVDUP32, ARM::FeaturePreferVMOVSR,
+      ARM::FeaturePrefISHSTBarrier, ARM::FeatureMuxedUnits,
+      ARM::FeatureSlowOddRegister, ARM::FeatureSlowLoadDSubreg,
+      ARM::FeatureDontWidenVMOVS, ARM::FeatureExpandMLx,
+      ARM::FeatureHasVMLxHazards, ARM::FeatureNEONForFPMovs,
+      ARM::FeatureNEONForFP, ARM::FeatureCheckVLDnAlign,
+      ARM::FeatureHasSlowFPVMLx, ARM::FeatureVMLxForwarding,
+      ARM::FeaturePref32BitThumb, ARM::FeatureAvoidPartialCPSR,
+      ARM::FeatureCheapPredicableCPSR, ARM::FeatureAvoidMOVsShOp,
+      ARM::FeatureHasRetAddrStack, ARM::FeatureHasNoBranchPredictor,
+      ARM::FeatureDSP, ARM::FeatureMP, ARM::FeatureVirtualization,
+      ARM::FeatureMClass, ARM::FeatureRClass, ARM::FeatureAClass,
+      ARM::FeatureNaClTrap, ARM::FeatureStrictAlign, ARM::FeatureLongCalls,
+      ARM::FeatureExecuteOnly, ARM::FeatureReserveR9, ARM::FeatureNoMovt,
+      ARM::FeatureNoNegativeImmediates
+  };
+
+  const ARMSubtarget *getST() const { return ST; }
+  const ARMTargetLowering *getTLI() const { return TLI; }
+
+public:
+  explicit ARMTTIImpl(const ARMBaseTargetMachine *TM, const Function &F)
+      : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
+        TLI(ST->getTargetLowering()) {}
+
+  bool areInlineCompatible(const Function *Caller,
+                           const Function *Callee) const;
+
+  bool enableInterleavedAccessVectorization() { return true; }
+
+  /// Floating-point computation using ARMv8 AArch32 Advanced
+  /// SIMD instructions remains unchanged from ARMv7. Only AArch64 SIMD
+  /// is IEEE-754 compliant, but it's not covered in this target.
+  bool isFPVectorizationPotentiallyUnsafe() {
+    return !ST->isTargetDarwin();
+  }
+
+  /// \name Scalar TTI Implementations
+  /// @{
+
+  int getIntImmCodeSizeCost(unsigned Opcode, unsigned Idx, const APInt &Imm,
+                            Type *Ty);
+
+  using BaseT::getIntImmCost;
+  int getIntImmCost(const APInt &Imm, Type *Ty);
+
+  int getIntImmCost(unsigned Opcode, unsigned Idx, const APInt &Imm, Type *Ty);
+
+  /// @}
+
+  /// \name Vector TTI Implementations
+  /// @{
+
+  unsigned getNumberOfRegisters(bool Vector) {
+    if (Vector) {
+      if (ST->hasNEON())
+        return 16;
+      return 0;
+    }
+
+    if (ST->isThumb1Only())
+      return 8;
+    return 13;
+  }
+
+  unsigned getRegisterBitWidth(bool Vector) const {
+    if (Vector) {
+      if (ST->hasNEON())
+        return 128;
+      return 0;
+    }
+
+    return 32;
+  }
+
+  unsigned getMaxInterleaveFactor(unsigned VF) {
+    return ST->getMaxInterleaveFactor();
+  }
+
+  int getShuffleCost(TTI::ShuffleKind Kind, Type *Tp, int Index, Type *SubTp);
+
+  int getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src,
+                       const Instruction *I = nullptr);
+
+  int getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy,
+                         const Instruction *I = nullptr);
+
+  int getVectorInstrCost(unsigned Opcode, Type *Val, unsigned Index);
+
+  int getAddressComputationCost(Type *Val, ScalarEvolution *SE, 
+                                const SCEV *Ptr);
+
+  int getArithmeticInstrCost(
+      unsigned Opcode, Type *Ty,
+      TTI::OperandValueKind Op1Info = TTI::OK_AnyValue,
+      TTI::OperandValueKind Op2Info = TTI::OK_AnyValue,
+      TTI::OperandValueProperties Opd1PropInfo = TTI::OP_None,
+      TTI::OperandValueProperties Opd2PropInfo = TTI::OP_None,
+      ArrayRef<const Value *> Args = ArrayRef<const Value *>());
+
+  int getMemoryOpCost(unsigned Opcode, Type *Src, unsigned Alignment,
+                      unsigned AddressSpace, const Instruction *I = nullptr);
+
+  int getInterleavedMemoryOpCost(unsigned Opcode, Type *VecTy, unsigned Factor,
+                                 ArrayRef<unsigned> Indices, unsigned Alignment,
+                                 unsigned AddressSpace);
+
+  void getUnrollingPreferences(Loop *L, ScalarEvolution &SE,
+                               TTI::UnrollingPreferences &UP);
+
+  bool shouldBuildLookupTablesForConstant(Constant *C) const {
+    // In the ROPI and RWPI relocation models we can't have pointers to global
+    // variables or functions in constant data, so don't convert switches to
+    // lookup tables if any of the values would need relocation.
+    if (ST->isROPI() || ST->isRWPI())
+      return !C->needsRelocation();
+
+    return true;
+  }
+  /// @}
+};
+
+} // end namespace llvm
+
+#endif // LLVM_LIB_TARGET_ARM_ARMTARGETTRANSFORMINFO_H