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