llvm/lib/Target/Mips/MipsAnalyzeImmediate.h

   1 //===- MipsAnalyzeImmediate.h - Analyze Immediates -------------*- C++ -*--===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_LIB_TARGET_MIPS_MIPSANALYZEIMMEDIATE_H
  10 #define LLVM_LIB_TARGET_MIPS_MIPSANALYZEIMMEDIATE_H
  11
  12 #include "llvm/ADT/SmallVector.h"
  13 #include <cstdint>
  14
  15 namespace llvm {
  16
  17   class MipsAnalyzeImmediate {
  18   public:
  19     struct Inst {
  20       unsigned Opc, ImmOpnd;
  21
  22       Inst(unsigned Opc, unsigned ImmOpnd);
  23     };
  24     using InstSeq = SmallVector<Inst, 7>;
  25
  26     /// Analyze - Get an instruction sequence to load immediate Imm. The last
  27     /// instruction in the sequence must be an ADDiu if LastInstrIsADDiu is
  28     /// true;
  29     const InstSeq &Analyze(uint64_t Imm, unsigned Size, bool LastInstrIsADDiu);
  30
  31   private:
  32     using InstSeqLs = SmallVector<InstSeq, 5>;
  33
  34     /// AddInstr - Add I to all instruction sequences in SeqLs.
  35     void AddInstr(InstSeqLs &SeqLs, const Inst &I);
  36
  37     /// GetInstSeqLsADDiu - Get instruction sequences which end with an ADDiu to
  38     /// load immediate Imm
  39     void GetInstSeqLsADDiu(uint64_t Imm, unsigned RemSize, InstSeqLs &SeqLs);
  40
  41     /// GetInstSeqLsORi - Get instrutcion sequences which end with an ORi to
  42     /// load immediate Imm
  43     void GetInstSeqLsORi(uint64_t Imm, unsigned RemSize, InstSeqLs &SeqLs);
  44
  45     /// GetInstSeqLsSLL - Get instruction sequences which end with a SLL to
  46     /// load immediate Imm
  47     void GetInstSeqLsSLL(uint64_t Imm, unsigned RemSize, InstSeqLs &SeqLs);
  48
  49     /// GetInstSeqLs - Get instruction sequences to load immediate Imm.
  50     void GetInstSeqLs(uint64_t Imm, unsigned RemSize, InstSeqLs &SeqLs);
  51
  52     /// ReplaceADDiuSLLWithLUi - Replace an ADDiu & SLL pair with a LUi.
  53     void ReplaceADDiuSLLWithLUi(InstSeq &Seq);
  54
  55     /// GetShortestSeq - Find the shortest instruction sequence in SeqLs and
  56     /// return it in Insts.
  57     void GetShortestSeq(InstSeqLs &SeqLs, InstSeq &Insts);
  58
  59     unsigned Size;
  60     unsigned ADDiu, ORi, SLL, LUi;
  61     InstSeq Insts;
  62   };
  63
  64 } // end namespace llvm
  65
  66 #endif // LLVM_LIB_TARGET_MIPS_MIPSANALYZEIMMEDIATE_H