lib/Target/Mips/MipsAnalyzeImmediate.h

   1 //===- MipsAnalyzeImmediate.h - Analyze Immediates -------------*- 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 #ifndef LLVM_LIB_TARGET_MIPS_MIPSANALYZEIMMEDIATE_H
  11 #define LLVM_LIB_TARGET_MIPS_MIPSANALYZEIMMEDIATE_H
  12
  13 #include "llvm/ADT/SmallVector.h"
  14 #include <cstdint>
  15
  16 namespace llvm {
  17
  18   class MipsAnalyzeImmediate {
  19   public:
  20     struct Inst {
  21       unsigned Opc, ImmOpnd;
  22
  23       Inst(unsigned Opc, unsigned ImmOpnd);
  24     };
  25     using InstSeq = SmallVector<Inst, 7>;
  26
  27     /// Analyze - Get an instruction sequence to load immediate Imm. The last
  28     /// instruction in the sequence must be an ADDiu if LastInstrIsADDiu is
  29     /// true;
  30     const InstSeq &Analyze(uint64_t Imm, unsigned Size, bool LastInstrIsADDiu);
  31
  32   private:
  33     using InstSeqLs = SmallVector<InstSeq, 5>;
  34
  35     /// AddInstr - Add I to all instruction sequences in SeqLs.
  36     void AddInstr(InstSeqLs &SeqLs, const Inst &I);
  37
  38     /// GetInstSeqLsADDiu - Get instruction sequences which end with an ADDiu to
  39     /// load immediate Imm
  40     void GetInstSeqLsADDiu(uint64_t Imm, unsigned RemSize, InstSeqLs &SeqLs);
  41
  42     /// GetInstSeqLsORi - Get instrutcion sequences which end with an ORi to
  43     /// load immediate Imm
  44     void GetInstSeqLsORi(uint64_t Imm, unsigned RemSize, InstSeqLs &SeqLs);
  45
  46     /// GetInstSeqLsSLL - Get instruction sequences which end with a SLL to
  47     /// load immediate Imm
  48     void GetInstSeqLsSLL(uint64_t Imm, unsigned RemSize, InstSeqLs &SeqLs);
  49
  50     /// GetInstSeqLs - Get instruction sequences to load immediate Imm.
  51     void GetInstSeqLs(uint64_t Imm, unsigned RemSize, InstSeqLs &SeqLs);
  52
  53     /// ReplaceADDiuSLLWithLUi - Replace an ADDiu & SLL pair with a LUi.
  54     void ReplaceADDiuSLLWithLUi(InstSeq &Seq);
  55
  56     /// GetShortestSeq - Find the shortest instruction sequence in SeqLs and
  57     /// return it in Insts.
  58     void GetShortestSeq(InstSeqLs &SeqLs, InstSeq &Insts);
  59
  60     unsigned Size;
  61     unsigned ADDiu, ORi, SLL, LUi;
  62     InstSeq Insts;
  63   };
  64
  65 } // end namespace llvm
  66
  67 #endif // LLVM_LIB_TARGET_MIPS_MIPSANALYZEIMMEDIATE_H