AArch64TargetTransformInfo.cpp revision 36b56886974eae4f9c5ebc96befd3e7bfe5de338 
1//===- AArch64TargetTransformInfo.cpp - AArch64 specific TTI pass ---------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9/// \file
10/// This file implements a TargetTransformInfo analysis pass specific to the
11/// AArch64 target machine. It uses the target's detailed information to provide
12/// more precise answers to certain TTI queries, while letting the target
13/// independent and default TTI implementations handle the rest.
14///
15//===----------------------------------------------------------------------===//
16
17#define DEBUG_TYPE "aarch64tti"
18#include "AArch64.h"
19#include "AArch64TargetMachine.h"
20#include "llvm/Analysis/TargetTransformInfo.h"
21#include "llvm/Support/Debug.h"
22#include "llvm/Target/CostTable.h"
23#include "llvm/Target/TargetLowering.h"
24using namespace llvm;
25
26// Declare the pass initialization routine locally as target-specific passes
27// don't have a target-wide initialization entry point, and so we rely on the
28// pass constructor initialization.
29namespace llvm {
30void initializeAArch64TTIPass(PassRegistry &);
31}
32
33namespace {
34
35class AArch64TTI final : public ImmutablePass, public TargetTransformInfo {
36  const AArch64Subtarget *ST;
37  const AArch64TargetLowering *TLI;
38
39public:
40  AArch64TTI() : ImmutablePass(ID), ST(0), TLI(0) {
41    llvm_unreachable("This pass cannot be directly constructed");
42  }
43
44  AArch64TTI(const AArch64TargetMachine *TM)
45      : ImmutablePass(ID), ST(TM->getSubtargetImpl()),
46        TLI(TM->getTargetLowering()) {
47    initializeAArch64TTIPass(*PassRegistry::getPassRegistry());
48  }
49
50  virtual void initializePass() override {
51    pushTTIStack(this);
52  }
53
54  virtual void getAnalysisUsage(AnalysisUsage &AU) const override {
55    TargetTransformInfo::getAnalysisUsage(AU);
56  }
57
58  /// Pass identification.
59  static char ID;
60
61  /// Provide necessary pointer adjustments for the two base classes.
62  virtual void *getAdjustedAnalysisPointer(const void *ID) override {
63    if (ID == &TargetTransformInfo::ID)
64      return (TargetTransformInfo*)this;
65    return this;
66  }
67
68  /// \name Scalar TTI Implementations
69  /// @{
70
71  /// @}
72
73
74  /// \name Vector TTI Implementations
75  /// @{
76
77  unsigned getNumberOfRegisters(bool Vector) const {
78    if (Vector) {
79      if (ST->hasNEON())
80        return 32;
81      return 0;
82    }
83    return 32;
84  }
85
86  unsigned getRegisterBitWidth(bool Vector) const {
87    if (Vector) {
88      if (ST->hasNEON())
89        return 128;
90      return 0;
91    }
92    return 64;
93  }
94
95  /// @}
96};
97
98} // end anonymous namespace
99
100INITIALIZE_AG_PASS(AArch64TTI, TargetTransformInfo, "aarch64tti",
101                   "AArch64 Target Transform Info", true, true, false)
102char AArch64TTI::ID = 0;
103
104ImmutablePass *
105llvm::createAArch64TargetTransformInfoPass(const AArch64TargetMachine *TM) {
106  return new AArch64TTI(TM);
107}
108