MWCC/includes/compiler/LoopDetection.h

#ifndef COMPILER_LOOPDETECTION_H
#define COMPILER_LOOPDETECTION_H

#include "compiler/common.h"
#include "compiler/BitVector.h"

#ifdef __MWERKS__
#pragma options align=mac68k
#endif
typedef struct BlockList {
    struct BlockList *next;
    PCodeBlock *block;
} BlockList;

typedef struct InstrList {
    struct InstrList *next;
    PCode *instr;
} InstrList;

typedef enum LoopBound {
    LOOP_BOUND_INDETERMINATE,
    LOOP_BOUND_CONSTANT,
    LOOP_BOUND_VARIABLE
} LoopBound;

typedef struct Loop {
    struct Loop *parent;
    struct Loop *nextSibling;
    struct Loop *children;
    PCodeBlock *body; // repeated block
    PCodeBlock *preheader; // block at the start of the loop
    PCodeBlock *footer; // block at the end of the loop
    PCode *pc18;
    BlockList *blocks;
    UInt32 *memberblocks;
    UInt32 *vec24;
    UInt32 *vec28;
    UInt32 *vec2C;
    struct BasicInductionVar *basicInductionVars;
    int loopWeight;
    int bodySize; // amount of instructions in the body
    SInt32 iterationCount;
    SInt32 lower;
    SInt32 upper;
    SInt32 step; // value added in each iteration
    unsigned char unknownCondition;
    Boolean x4D;
    Boolean x4E;
    Boolean x4F;
    Boolean isUnknownCountingLoop; // is a counting loop with non-constant iteration count
    Boolean isKnownCountingLoop;
    Boolean x52;
    Boolean x53;
    Boolean x54;
    LoopBound lowerType;
    LoopBound upperType;
    Boolean x57;
} Loop;

typedef struct BasicInductionVar {
    struct BasicInductionVar *next;
    Loop *loop;
    struct InductionVar *inductionVars;
    InstrList *instrsC;
    PCode *initializer;
    SInt32 step;
    short reg;
} BasicInductionVar;

typedef struct InductionVar {
    struct InductionVar *next;
    BasicInductionVar *basicVar;
    PCode *instr;
    PCode *instrC;
    Loop *someloop;
    SInt32 step;
    short x18; // arg index within instr
    short x1A; // arg index within instr
    short x1C; // reg
    short x1E; // reg
} InductionVar;
#ifdef __MWERKS__
#pragma options align=reset
#endif

extern Loop *loopsinflowgraph;
extern int loopdetection_nblocks;
extern BitVector *LoopTemp;
extern struct LoopList *LoopList_First;

extern void addblocktoloop(Loop *loop, PCodeBlock *block);
extern void insertpreheaderblock(Loop *loop);
extern void findloopsinflowgraph(void);
extern void analyzeForCountableLoops(Loop *loop);
extern void analyzeloop(Loop *loop);
extern void analyzeloopsinflowgraph(void);

#endif