LLVM  6.0.0svn
Analysis.h
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1 //===- CodeGen/Analysis.h - CodeGen LLVM IR Analysis Utilities --*- C++ -*-===//
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 //
10 // This file declares several CodeGen-specific LLVM IR analysis utilities.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_CODEGEN_ANALYSIS_H
15 #define LLVM_CODEGEN_ANALYSIS_H
16 
17 #include "llvm/ADT/ArrayRef.h"
18 #include "llvm/ADT/DenseMap.h"
19 #include "llvm/ADT/SmallVector.h"
20 #include "llvm/ADT/Triple.h"
22 #include "llvm/IR/CallSite.h"
23 #include "llvm/IR/InlineAsm.h"
24 #include "llvm/IR/Instructions.h"
25 #include "llvm/Support/CodeGen.h"
26 
27 namespace llvm {
28 class GlobalValue;
29 class MachineBasicBlock;
30 class MachineFunction;
31 class TargetLoweringBase;
32 class TargetLowering;
33 class TargetMachine;
34 class SDNode;
35 class SDValue;
36 class SelectionDAG;
37 struct EVT;
38 
39 /// \brief Compute the linearized index of a member in a nested
40 /// aggregate/struct/array.
41 ///
42 /// Given an LLVM IR aggregate type and a sequence of insertvalue or
43 /// extractvalue indices that identify a member, return the linearized index of
44 /// the start of the member, i.e the number of element in memory before the
45 /// sought one. This is disconnected from the number of bytes.
46 ///
47 /// \param Ty is the type indexed by \p Indices.
48 /// \param Indices is an optional pointer in the indices list to the current
49 /// index.
50 /// \param IndicesEnd is the end of the indices list.
51 /// \param CurIndex is the current index in the recursion.
52 ///
53 /// \returns \p CurIndex plus the linear index in \p Ty the indices list.
54 unsigned ComputeLinearIndex(Type *Ty,
55  const unsigned *Indices,
56  const unsigned *IndicesEnd,
57  unsigned CurIndex = 0);
58 
59 inline unsigned ComputeLinearIndex(Type *Ty,
60  ArrayRef<unsigned> Indices,
61  unsigned CurIndex = 0) {
62  return ComputeLinearIndex(Ty, Indices.begin(), Indices.end(), CurIndex);
63 }
64 
65 /// ComputeValueVTs - Given an LLVM IR type, compute a sequence of
66 /// EVTs that represent all the individual underlying
67 /// non-aggregate types that comprise it.
68 ///
69 /// If Offsets is non-null, it points to a vector to be filled in
70 /// with the in-memory offsets of each of the individual values.
71 ///
72 void ComputeValueVTs(const TargetLowering &TLI, const DataLayout &DL, Type *Ty,
73  SmallVectorImpl<EVT> &ValueVTs,
75  uint64_t StartingOffset = 0);
76 
77 /// ExtractTypeInfo - Returns the type info, possibly bitcast, encoded in V.
79 
80 /// hasInlineAsmMemConstraint - Return true if the inline asm instruction being
81 /// processed uses a memory 'm' constraint.
83  const TargetLowering &TLI);
84 
85 /// getFCmpCondCode - Return the ISD condition code corresponding to
86 /// the given LLVM IR floating-point condition code. This includes
87 /// consideration of global floating-point math flags.
88 ///
90 
91 /// getFCmpCodeWithoutNaN - Given an ISD condition code comparing floats,
92 /// return the equivalent code if we're allowed to assume that NaNs won't occur.
94 
95 /// getICmpCondCode - Return the ISD condition code corresponding to
96 /// the given LLVM IR integer condition code.
97 ///
99 
100 /// Test if the given instruction is in a position to be optimized
101 /// with a tail-call. This roughly means that it's in a block with
102 /// a return and there's nothing that needs to be scheduled
103 /// between it and the return.
104 ///
105 /// This function only tests target-independent requirements.
107 
108 /// Test if given that the input instruction is in the tail call position, if
109 /// there is an attribute mismatch between the caller and the callee that will
110 /// inhibit tail call optimizations.
111 /// \p AllowDifferingSizes is an output parameter which, if forming a tail call
112 /// is permitted, determines whether it's permitted only if the size of the
113 /// caller's and callee's return types match exactly.
114 bool attributesPermitTailCall(const Function *F, const Instruction *I,
115  const ReturnInst *Ret,
116  const TargetLoweringBase &TLI,
117  bool *AllowDifferingSizes = nullptr);
118 
119 /// Test if given that the input instruction is in the tail call position if the
120 /// return type or any attributes of the function will inhibit tail call
121 /// optimization.
123  const ReturnInst *Ret,
124  const TargetLoweringBase &TLI);
125 
128 
129 } // End llvm namespace
130 
131 #endif
Return a value (possibly void), from a function.
A parsed version of the target data layout string in and methods for querying it. ...
Definition: DataLayout.h:109
ISD::CondCode getICmpCondCode(ICmpInst::Predicate Pred)
getICmpCondCode - Return the ISD condition code corresponding to the given LLVM IR integer condition ...
Definition: Analysis.cpp:199
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
iterator begin() const
Definition: ArrayRef.h:137
Offsets
Offsets in bytes from the start of the input buffer.
Definition: SIInstrInfo.h:935
F(f)
GlobalValue * ExtractTypeInfo(Value *V)
ExtractTypeInfo - Returns the type info, possibly bitcast, encoded in V.
Definition: Analysis.cpp:119
bool returnTypeIsEligibleForTailCall(const Function *F, const Instruction *I, const ReturnInst *Ret, const TargetLoweringBase &TLI)
Test if given that the input instruction is in the tail call position if the return type or any attri...
Definition: Analysis.cpp:550
This class consists of common code factored out of the SmallVector class to reduce code duplication b...
Definition: APFloat.h:42
This class defines information used to lower LLVM code to legal SelectionDAG operators that the targe...
CondCode
ISD::CondCode enum - These are ordered carefully to make the bitfields below work out...
Definition: ISDOpcodes.h:916
ISD::CondCode getFCmpCondCode(FCmpInst::Predicate Pred)
getFCmpCondCode - Return the ISD condition code corresponding to the given LLVM IR floating-point con...
Definition: Analysis.cpp:162
void ComputeValueVTs(const TargetLowering &TLI, const DataLayout &DL, Type *Ty, SmallVectorImpl< EVT > &ValueVTs, SmallVectorImpl< uint64_t > *Offsets=nullptr, uint64_t StartingOffset=0)
ComputeValueVTs - Given an LLVM IR type, compute a sequence of EVTs that represent all the individual...
Definition: Analysis.cpp:85
bool hasInlineAsmMemConstraint(InlineAsm::ConstraintInfoVector &CInfos, const TargetLowering &TLI)
hasInlineAsmMemConstraint - Return true if the inline asm instruction being processed uses a memory &#39;...
Definition: Analysis.cpp:140
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:46
Predicate
This enumeration lists the possible predicates for CmpInst subclasses.
Definition: InstrTypes.h:853
bool isInTailCallPosition(ImmutableCallSite CS, const TargetMachine &TM)
Test if the given instruction is in a position to be optimized with a tail-call.
Definition: Analysis.cpp:472
std::vector< ConstraintInfo > ConstraintInfoVector
Definition: InlineAsm.h:116
This base class for TargetLowering contains the SelectionDAG-independent parts that can be used from ...
DenseMap< const MachineBasicBlock *, int > getFuncletMembership(const MachineFunction &MF)
Definition: Analysis.cpp:663
iterator end() const
Definition: ArrayRef.h:138
ISD::CondCode getFCmpCodeWithoutNaN(ISD::CondCode CC)
getFCmpCodeWithoutNaN - Given an ISD condition code comparing floats, return the equivalent code if w...
Definition: Analysis.cpp:184
Establish a view to a call site for examination.
Definition: CallSite.h:713
#define I(x, y, z)
Definition: MD5.cpp:58
LLVM Value Representation.
Definition: Value.h:73
Primary interface to the complete machine description for the target machine.
Definition: TargetMachine.h:57
bool attributesPermitTailCall(const Function *F, const Instruction *I, const ReturnInst *Ret, const TargetLoweringBase &TLI, bool *AllowDifferingSizes=nullptr)
Test if given that the input instruction is in the tail call position, if there is an attribute misma...
Definition: Analysis.cpp:510
unsigned ComputeLinearIndex(Type *Ty, const unsigned *Indices, const unsigned *IndicesEnd, unsigned CurIndex=0)
Compute the linearized index of a member in a nested aggregate/struct/array.
Definition: Analysis.cpp:37