mirror of https://git.wuffs.org/MWCC
99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
#ifndef COMPILER_LOOPDETECTION_H
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#define COMPILER_LOOPDETECTION_H
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#include "compiler/common.h"
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#include "compiler/BitVector.h"
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#ifdef __MWERKS__
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#pragma options align=mac68k
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#endif
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typedef struct BlockList {
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struct BlockList *next;
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PCodeBlock *block;
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} BlockList;
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typedef struct InstrList {
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struct InstrList *next;
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PCode *instr;
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} InstrList;
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typedef enum LoopBound {
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LOOP_BOUND_INDETERMINATE,
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LOOP_BOUND_CONSTANT,
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LOOP_BOUND_VARIABLE
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} LoopBound;
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typedef struct Loop {
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struct Loop *parent;
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struct Loop *nextSibling;
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struct Loop *children;
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PCodeBlock *body; // repeated block
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PCodeBlock *preheader; // block at the start of the loop
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PCodeBlock *footer; // block at the end of the loop
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PCode *pc18;
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BlockList *blocks;
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UInt32 *memberblocks;
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UInt32 *vec24;
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UInt32 *vec28;
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UInt32 *vec2C;
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struct BasicInductionVar *basicInductionVars;
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int loopWeight;
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int bodySize; // amount of instructions in the body
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SInt32 iterationCount;
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SInt32 lower;
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SInt32 upper;
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SInt32 step; // value added in each iteration
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unsigned char unknownCondition;
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Boolean x4D;
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Boolean x4E;
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Boolean x4F;
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Boolean isUnknownCountingLoop; // is a counting loop with non-constant iteration count
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Boolean isKnownCountingLoop;
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Boolean x52;
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Boolean x53;
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Boolean x54;
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LoopBound lowerType;
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LoopBound upperType;
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Boolean x57;
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} Loop;
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typedef struct BasicInductionVar {
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struct BasicInductionVar *next;
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Loop *loop;
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struct InductionVar *inductionVars;
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InstrList *instrsC;
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PCode *initializer;
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SInt32 step;
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short reg;
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} BasicInductionVar;
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typedef struct InductionVar {
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struct InductionVar *next;
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BasicInductionVar *basicVar;
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PCode *instr;
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PCode *instrC;
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Loop *someloop;
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SInt32 step;
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short x18; // arg index within instr
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short x1A; // arg index within instr
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short x1C; // reg
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short x1E; // reg
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} InductionVar;
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#ifdef __MWERKS__
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#pragma options align=reset
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#endif
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extern Loop *loopsinflowgraph;
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extern int loopdetection_nblocks;
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extern BitVector *LoopTemp;
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extern struct LoopList *LoopList_First;
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extern void addblocktoloop(Loop *loop, PCodeBlock *block);
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extern void insertpreheaderblock(Loop *loop);
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extern void findloopsinflowgraph(void);
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extern void analyzeForCountableLoops(Loop *loop);
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extern void analyzeloop(Loop *loop);
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extern void analyzeloopsinflowgraph(void);
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#endif
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