• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 <cstdint>
22 #include <map>
23 #include <string>
24 #include <vector>
25 
26 namespace llvm {
27 
28 struct TargetRecip {
29 public:
30   TargetRecip();
31 
32   /// Initialize all or part of the operations from command-line options or
33   /// a front end.
34   TargetRecip(const std::vector<std::string> &Args);
35 
36   /// Set whether a particular reciprocal operation is enabled and how many
37   /// refinement steps are needed when using it. Use "all" to set enablement
38   /// and refinement steps for all operations.
39   void setDefaults(StringRef Key, bool Enable, unsigned RefSteps);
40 
41   /// Return true if the reciprocal operation has been enabled by default or
42   /// from the command-line. Return false if the operation has been disabled
43   /// by default or from the command-line.
44   bool isEnabled(StringRef Key) const;
45 
46   /// Return the number of iterations necessary to refine the
47   /// the result of a machine instruction for the given reciprocal operation.
48   unsigned getRefinementSteps(StringRef Key) const;
49 
50   bool operator==(const TargetRecip &Other) const;
51 
52 private:
53   enum {
54     Uninitialized = -1
55   };
56 
57   struct RecipParams {
58     int8_t Enabled;
59     int8_t RefinementSteps;
60 
RecipParamsTargetRecip::RecipParams61     RecipParams() : Enabled(Uninitialized), RefinementSteps(Uninitialized) {}
62   };
63 
64   std::map<StringRef, RecipParams> RecipMap;
65   typedef std::map<StringRef, RecipParams>::iterator RecipIter;
66   typedef std::map<StringRef, RecipParams>::const_iterator ConstRecipIter;
67 
68   bool parseGlobalParams(const std::string &Arg);
69   void parseIndividualParams(const std::vector<std::string> &Args);
70 };
71 
72 } // end namespace llvm
73 
74 #endif // LLVM_TARGET_TARGETRECIP_H
75