Analysis.h revision 44ab89eb376af838d1123293a79975aede501464 
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 utilties.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CODEGEN_ANALYSIS_H
15#define LLVM_CODEGEN_ANALYSIS_H
16
17#include "llvm/Instructions.h"
18#include "llvm/InlineAsm.h"
19#include "llvm/ADT/SmallVector.h"
20#include "llvm/CodeGen/ValueTypes.h"
21#include "llvm/CodeGen/ISDOpcodes.h"
22#include "llvm/Support/CallSite.h"
23
24namespace llvm {
25
26class TargetLowering;
27class GlobalVariable;
28
29/// ComputeLinearIndex - Given an LLVM IR aggregate type and a sequence
30/// of insertvalue or extractvalue indices that identify a member, return
31/// the linearized index of the start of the member.
32///
33unsigned ComputeLinearIndex(const Type *Ty,
34                            const unsigned *Indices,
35                            const unsigned *IndicesEnd,
36                            unsigned CurIndex = 0);
37
38/// ComputeValueVTs - Given an LLVM IR type, compute a sequence of
39/// EVTs that represent all the individual underlying
40/// non-aggregate types that comprise it.
41///
42/// If Offsets is non-null, it points to a vector to be filled in
43/// with the in-memory offsets of each of the individual values.
44///
45void ComputeValueVTs(const TargetLowering &TLI, const Type *Ty,
46                     SmallVectorImpl<EVT> &ValueVTs,
47                     SmallVectorImpl<uint64_t> *Offsets = 0,
48                     uint64_t StartingOffset = 0);
49
50/// ExtractTypeInfo - Returns the type info, possibly bitcast, encoded in V.
51GlobalVariable *ExtractTypeInfo(Value *V);
52
53/// hasInlineAsmMemConstraint - Return true if the inline asm instruction being
54/// processed uses a memory 'm' constraint.
55bool hasInlineAsmMemConstraint(InlineAsm::ConstraintInfoVector &CInfos,
56                               const TargetLowering &TLI);
57
58/// getFCmpCondCode - Return the ISD condition code corresponding to
59/// the given LLVM IR floating-point condition code.  This includes
60/// consideration of global floating-point math flags.
61///
62ISD::CondCode getFCmpCondCode(FCmpInst::Predicate Pred);
63
64/// getICmpCondCode - Return the ISD condition code corresponding to
65/// the given LLVM IR integer condition code.
66///
67ISD::CondCode getICmpCondCode(ICmpInst::Predicate Pred);
68
69/// Test if the given instruction is in a position to be optimized
70/// with a tail-call. This roughly means that it's in a block with
71/// a return and there's nothing that needs to be scheduled
72/// between it and the return.
73///
74/// This function only tests target-independent requirements.
75bool isInTailCallPosition(ImmutableCallSite CS, Attributes CalleeRetAttr,
76                          const TargetLowering &TLI);
77
78} // End llvm namespace
79
80#endif
81