LLVM  3.7.0
TargetRecip.h
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1 //===--------------------- llvm/Target/TargetRecip.h ------------*- 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 class is used to customize machine-specific reciprocal estimate code
11 // generation in a target-independent way.
12 // If a target does not support operations in this specification, then code
13 // generation will default to using supported operations.
14 //
15 //===----------------------------------------------------------------------===//
16 
17 #ifndef LLVM_TARGET_TARGETRECIP_H
18 #define LLVM_TARGET_TARGETRECIP_H
19 
20 #include "llvm/ADT/StringRef.h"
21 #include <vector>
22 #include <string>
23 #include <map>
24 
25 namespace llvm {
26 
27 struct TargetRecip {
28 public:
29  TargetRecip();
30 
31  /// Initialize all or part of the operations from command-line options or
32  /// a front end.
33  TargetRecip(const std::vector<std::string> &Args);
34 
35  /// Set whether a particular reciprocal operation is enabled and how many
36  /// refinement steps are needed when using it. Use "all" to set enablement
37  /// and refinement steps for all operations.
38  void setDefaults(const StringRef &Key, bool Enable, unsigned RefSteps);
39 
40  /// Return true if the reciprocal operation has been enabled by default or
41  /// from the command-line. Return false if the operation has been disabled
42  /// by default or from the command-line.
43  bool isEnabled(const StringRef &Key) const;
44 
45  /// Return the number of iterations necessary to refine the
46  /// the result of a machine instruction for the given reciprocal operation.
47  unsigned getRefinementSteps(const StringRef &Key) const;
48 
49  bool operator==(const TargetRecip &Other) const;
50 
51 private:
52  enum {
53  Uninitialized = -1
54  };
55 
56  struct RecipParams {
57  int8_t Enabled;
58  int8_t RefinementSteps;
59 
60  RecipParams() : Enabled(Uninitialized), RefinementSteps(Uninitialized) {}
61  };
62 
63  std::map<StringRef, RecipParams> RecipMap;
64  typedef std::map<StringRef, RecipParams>::iterator RecipIter;
65  typedef std::map<StringRef, RecipParams>::const_iterator ConstRecipIter;
66 
67  bool parseGlobalParams(const std::string &Arg);
68  void parseIndividualParams(const std::vector<std::string> &Args);
69 };
70 
71 } // End llvm namespace
72 
73 #endif
static cl::opt< bool > Enabled("stats", cl::desc("Enable statistics output from program (available with Asserts)"))
-stats - Command line option to cause transformations to emit stats about what they did...
ELFYAML::ELF_STO Other
Definition: ELFYAML.cpp:591
bool operator==(const TargetRecip &Other) const
bool isEnabled(const StringRef &Key) const
Return true if the reciprocal operation has been enabled by default or from the command-line.
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:40
unsigned getRefinementSteps(const StringRef &Key) const
Return the number of iterations necessary to refine the the result of a machine instruction for the g...
void setDefaults(const StringRef &Key, bool Enable, unsigned RefSteps)
Set whether a particular reciprocal operation is enabled and how many refinement steps are needed whe...