/*-------------------------------------------------------------------------
- pcode.h - post code generation
+ pcode.c - post code generation
Written By - Scott Dattalo scott@dattalo.com
This program is free software; you can redistribute it and/or modify it
#include "common.h" // Include everything in the SDCC src directory
#include "newalloc.h"
-#include "ralloc.h"
-#include "pcode.h"
+#include "pcode.h"
+#include "ralloc.h"
// Eventually this will go into device dependent files:
-pCodeOp pc_status = {PO_STATUS, "STATUS"};
-pCodeOp pc_indf = {PO_INDF, "INDF"};
-pCodeOp pc_fsr = {PO_FSR, "FSR"};
+pCodeOpReg pc_status = {{PO_STATUS, "STATUS"}, -1, NULL,NULL};
+pCodeOpReg pc_indf = {{PO_INDF, "INDF"}, -1, NULL,NULL};
+pCodeOpReg pc_fsr = {{PO_FSR, "FSR"}, -1, NULL,NULL};
//static char *PIC_mnemonics[] = {
static char *scpADDLW = "ADDLW";
static pFile *the_pFile = NULL;
-static int peepOptimizing = 0;
+static int peepOptimizing = 1;
static int GpCodeSequenceNumber = 1;
-/****************************************************************/
-/****************************************************************/
-typedef struct _DLL {
- struct _DLL *prev;
- struct _DLL *next;
- // void *data;
-} _DLL;
-
-
-typedef struct pCodePeepSnippets
-{
- _DLL dll;
- pCodePeep *peep;
-} pCodePeepSnippets;
-
-
-static pCodePeepSnippets *peepSnippets=NULL;
-
/****************************************************************/
/* Forward declarations */
/****************************************************************/
}
+void pCodeInitRegisters(void)
+{
+
+ pc_fsr.rIdx = 4;
+ pc_fsr.r = pic14_regWithIdx(4);
+
+}
+
char getpBlock_dbName(pBlock *pb)
{
if(!pb)
}
}
}
+static int RegCond(pCodeOp *pcop)
+{
+
+ if(!pcop)
+ return 0;
+
+ if(pcop->type == PO_BIT && !strcmp(pcop->name, pc_status.pcop.name)) {
+ switch(PCOB(pcop)->bit) {
+ case PIC_C_BIT:
+ return PCC_C;
+ case PIC_DC_BIT:
+ return PCC_DC;
+ case PIC_Z_BIT:
+ return PCC_Z;
+ }
+
+ }
+
+ return 0;
+}
/*-----------------------------------------------------------------*/
/* newpCode - create and return a newly initialized pCode */
case POC_BCF:
pci->bit_inst = 1;
pci->mnemonic = scpBCF;
+ pci->outCond = RegCond(pcop);
break;
case POC_BSF:
pci->bit_inst = 1;
pci->mnemonic = scpBSF;
+ pci->outCond = RegCond(pcop);
break;
case POC_BTFSC:
pci->bit_inst = 1;
pci->mnemonic = scpBTFSC;
pci->pc.analyze = AnalyzeSKIP;
+ pci->inCond = RegCond(pcop);
break;
case POC_BTFSS:
pci->bit_inst = 1;
pci->mnemonic = scpBTFSS;
pci->pc.analyze = AnalyzeSKIP;
+ pci->inCond = RegCond(pcop);
break;
case POC_CALL:
pci->num_ops = 1;
the_pFile->pbTail = pb;
}
-void printpCodeString(FILE *of, pCode *pc, int max)
-{
- int i=0;
-
- while(pc && (i++<max)) {
- pc->print(of,pc);
- pc = pc->next;
- }
-}
/*-----------------------------------------------------------------*/
/* printpCode - write the contents of a pCode to a file */
/*-----------------------------------------------------------------*/
static char *get_op( pCodeInstruction *pcc)
{
+ regs *r;
+
if(pcc && pcc->pcop) {
+ switch(pcc->pcop->type) {
- if(pcc->pcop->type == PO_GPR_TEMP) {
- regs *r;
- r = pic14_regWithIdx(PCOR(pcc->pcop)->r->rIdx);
- //pcc->pcop->name = Safe_strdup(r->name);
- //sprintf(buffer, "R0X%x",PCOR(pcc->pcop)->rIdx);
- //pcc->pcop->name = Safe_strdup(PCOR(pcc->pcop)->r->name);
- fprintf(stderr,"getop: getting %s\nfrom:\n",r->name); //pcc->pcop->name);
- pBlockRegs(stderr,pcc->pc.pb);
- return r->name;
- }
+ case PO_FSR:
+ case PO_GPR_TEMP:
+ r = pic14_regWithIdx(PCOR(pcc->pcop)->r->rIdx);
+ fprintf(stderr,"getop: getting %s\nfrom:\n",r->name); //pcc->pcop->name);
+ pBlockRegs(stderr,pcc->pc.pb);
+ return r->name;
- if (pcc->pcop->name)
- return pcc->pcop->name;
+ default:
+ if (pcc->pcop->name)
+ return pcc->pcop->name;
+ }
}
+
return "NO operand";
}
fprintf(of,";wild card label\n");
}
-
-/*-----------------------------------------------------------------*/
-/* _DLL * DLL_append */
-/* */
-/* Append a _DLL object to the end of a _DLL (doubly linked list) */
-/* If The list to which we want to append is non-existant then one */
-/* is created. Other wise, the end of the list is sought out and */
-/* a new DLL object is appended to it. In either case, the void */
-/* *data is added to the newly created DLL object. */
-/*-----------------------------------------------------------------*/
-
-static void * DLL_append(_DLL *list, _DLL *next)
-{
- _DLL *b;
-
-
- /* If there's no list, then create one: */
- if(!list) {
- next->next = next->prev = NULL;
- return next;
- }
-
-
- /* Search for the end of the list. */
- b = list;
- while(b->next)
- b = b->next;
-
- /* Now append the new DLL object */
- b->next = next;
- b->next->prev = b;
- b = b->next;
- b->next = NULL;
-
- return list;
-
-}
/*-----------------------------------------------------------------*/
static pBranch * pBranchAppend(pBranch *h, pBranch *n)
fprintf(of,"block dbname: %c\n", getpBlock_dbName(pb));
}
}
-/*-----------------------------------------------------------------
-
- pCode peephole optimization
-
-
- The pCode "peep hole" optimization is not too unlike the peep hole
- optimization in SDCCpeeph.c. The major difference is that here we
- use pCode's whereas there we use ASCII strings. The advantage with
- pCode's is that we can ascertain flow information in the instructions
- being optimized.
-
-
-<FIX ME> - elaborate...
-
- -----------------------------------------------------------------*/
-
-#if 0
-/*-----------------------------------------------------------------*/
-/* pCodePeep */
-/*-----------------------------------------------------------------*/
-int pCodePeepCompare(pCode *pc, pCodePeep *pcp)
-{
- pCode *pcfrom,*pcto;
-
- pcfrom = pc;
- for( pcto=pcp->target; pcto; pcto=pcto->next) {
-
- pcfrom = findNextInstruction(pcfrom);
-
- if( pcfrom &&
- (PCI(pcfrom)->op == PCI(pcto)->op ||
- PCI(pcto)->op == POC_WILD))
- continue;
- return 0;
- }
- return 0;
-}
-
-/*-----------------------------------------------------------------*/
-/* pCodePeep */
-/*-----------------------------------------------------------------*/
-void pCodePeepSearch(pCodePeep *snippet)
-{
- pBlock *pb;
- pCode *pc;
-
- if(!the_pFile)
- return;
-
- /* compare the chain to the pCode that we've
- got so far. If a match is found, then replace
- the pCode chain.
- */
- for(pb = the_pFile->pbHead; pb; pb = pb->next) {
- for(pc = pb->pcHead; pc; pc = pc->next) {
- pCodePeepCompare(pc,snippet);
- }
- }
-
-}
-#endif
-
-#if 0
-pBlock *pBlockAppend(pBlock *pb1, pBlock *pb2)
-{
- pBlock *pb;
-
- if(!pb1->tail)
- return pb2;
-
- pb = pb1->tail;
-
- pb2->head = pb1;
- pb2->tail = NULL;
- pb1->tail = pb2;
-
-}
-
-#endif
-
-void pCodePeepInit(void)
-{
- pBlock *pb;
- // pCode *pc;
- pCodePeep *pcp;
- pCodePeepSnippets *pcps;
-
- /* Declare a peep code snippet */
- /* <FIXME> do I really need a separate struct just to DLL the snippets? */
- /* e.g. I could put the DLL into the pCodePeep structure */
- pcps = Safe_calloc(1,sizeof(pCodePeepSnippets));
- pcp = pcps->peep = Safe_calloc(1,sizeof(pCodePeep));
- peepSnippets = DLL_append((_DLL*)peepSnippets,(_DLL*)pcps);
-
-
- pb = newpCodeChain(NULL, 'W', newpCode(POC_MOVWF, newpCodeOpWild(0,pcp,newpCodeOp(NULL,PO_GPR_REGISTER))) );
- addpCode2pBlock( pb, newpCode(POC_MOVFW, newpCodeOpWild(0,pcp,newpCodeOp(NULL,PO_GPR_REGISTER))) );
-
- pcp->target = pb;
-
- pcp->replace = newpCodeChain(NULL, 'W',newpCode(POC_MOVWF, newpCodeOpWild(0,pcp,newpCodeOp(NULL,PO_GPR_REGISTER))) );
-
- /* Allocate space to store pointers to the wildcard variables */
- pcp->nvars = 1;
- pcp->vars = Safe_calloc(pcp->nvars, sizeof(char *));
- pcp->nwildpCodes = 0;
- pcp->wildpCodes = NULL;
-
- pcp->postFalseCond = PCC_Z;
- pcp->postTrueCond = PCC_NONE;
-
- fprintf(stderr,"Peep rule\nTarget:\n");
- printpCodeString(stderr,pcp->target->pcHead, 10);
- fprintf(stderr,"Replaced with:\n");
- printpCodeString(stderr,pcp->replace->pcHead, 10);
-
- /* Now for another peep example */
- pcps = Safe_calloc(1,sizeof(pCodePeepSnippets));
- pcp = pcps->peep = Safe_calloc(1,sizeof(pCodePeep));
- peepSnippets = DLL_append((_DLL*)peepSnippets,(_DLL*)pcps);
-
- {
- pCodeOp *pcl;
- pCodeOp *pcw;
- pCodeOp *pcwb;
-
- pcwb = newpCodeOpWild(0,pcp,newpCodeOpBit(NULL,-1));
- pb = newpCodeChain(NULL, 'W',newpCode(POC_BTFSC,pcwb));
-
- pcl = newpCodeOpLabel(-1);
- pcw = newpCodeOpWild(1, pcp, pcl);
- addpCode2pBlock( pb, newpCode(POC_GOTO, pcw));
- addpCode2pBlock( pb, newpCodeWild(0,NULL,NULL));
- addpCode2pBlock( pb, newpCodeWild(1,NULL,pcw));
-
-
- pcp->target = pb;
-
- pb = newpCodeChain(NULL, 'W',newpCode(POC_BTFSS, pcwb));
- addpCode2pBlock( pb, newpCodeWild(0,NULL,NULL));
- addpCode2pBlock( pb, newpCodeWild(1,NULL,pcw));
-
- pcp->replace = pb;
-
- /* Allocate space to store pointers to the wildcard variables */
- pcp->nvars = 2;
- pcp->vars = Safe_calloc(pcp->nvars, sizeof(char *));
- pcp->nwildpCodes = 2;
- pcp->wildpCodes = Safe_calloc(pcp->nwildpCodes, sizeof(pCode *));
-
- pcp->postFalseCond = PCC_NONE;
- pcp->postTrueCond = PCC_NONE;
- }
-
-
-
-
-
-
-
-
-
-
- //-------------
-
- /* Now for another peep example */
- pcps = Safe_calloc(1,sizeof(pCodePeepSnippets));
- pcp = pcps->peep = Safe_calloc(1,sizeof(pCodePeep));
- peepSnippets = DLL_append((_DLL*)peepSnippets,(_DLL*)pcps);
-
- {
- pCodeOp *pcw;
-
- pcw = newpCodeOpWild(0,pcp,newpCodeOp(NULL,PO_GPR_REGISTER));
-
- pb = newpCodeChain(NULL, 'W', newpCode(POC_MOVWF, pcw));
- addpCode2pBlock( pb, newpCode(POC_MOVWF, pcw));
-
- pcp->target = pb;
-
- pb = newpCodeChain(NULL, 'W',newpCode(POC_MOVWF, pcw));
-
- pcp->replace = pb;
-
- /* Allocate space to store pointers to the wildcard variables */
- pcp->nvars = 1;
- pcp->vars = Safe_calloc(pcp->nvars, sizeof(char *));
- pcp->nwildpCodes = 0;
- pcp->wildpCodes = NULL;
-
- pcp->postFalseCond = PCC_NONE;
- pcp->postTrueCond = PCC_NONE;
- }
-
-
-
-
-}
-
-/*-----------------------------------------------------------------*/
-/* pCodeSearchCondition - Search a pCode chain for a 'condition' */
-/* */
-/* return conditions */
-/* 1 - The Condition was found for a pCode's input */
-/* 0 - No matching condition was found for the whole chain */
-/* -1 - The Condition was found for a pCode's output */
-/* */
-/*-----------------------------------------------------------------*/
-int pCodeSearchCondition(pCode *pc, unsigned int cond)
-{
-
- while(pc) {
-
- /* If we reach a function end (presumably an end since we most
- probably began the search in the middle of a function), then
- the condition was not found. */
- if(pc->type == PC_FUNCTION)
- return 0;
-
- if(pc->type == PC_OPCODE) {
- if(PCI(pc)->inCond & cond)
- return 1;
- if(PCI(pc)->outCond & cond)
- return -1;
- }
-
- pc = pc->next;
- }
-
- return 0;
-}
-/*-----------------------------------------------------------------*/
-/* pCodePeepMatchLine - Compare source and destination pCodes to */
-/* see they're the same. */
-/*-----------------------------------------------------------------*/
-int pCodePeepMatchLine(pCodePeep *peepBlock, pCode *pcs, pCode *pcd)
-{
- int index; // index into wild card arrays
-
- if(pcs->type == pcd->type) {
-
- if(pcs->type == PC_OPCODE) {
-
- /* If the opcodes don't match then the line doesn't match */
- if(PCI(pcs)->op != PCI(pcd)->op)
- return 0;
-
- fprintf(stderr,"%s comparing\n",__FUNCTION__);
- pcs->print(stderr,pcs);
- pcd->print(stderr,pcd);
-
- /* Compare the operands */
- if(PCI(pcd)->pcop) {
- if (PCI(pcd)->pcop->type == PO_WILD) {
- index = PCOW(PCI(pcd)->pcop)->id;
-
- fprintf(stderr,"destination is wild\n");
-#ifdef DEBUG_PCODEPEEP
- if (index > peepBlock->nvars) {
- fprintf(stderr,"%s - variables exceeded\n",__FUNCTION__);
- exit(1);
- }
-#endif
- PCOW(PCI(pcd)->pcop)->matched = PCI(pcs)->pcop;
- {
- char *n;
-
- if(PCI(pcs)->pcop->type == PO_GPR_TEMP)
- n = PCOR(PCI(pcs)->pcop)->r->name;
- else
- n = PCI(pcs)->pcop->name;
-
- if(peepBlock->vars[index])
- return (strcmp(peepBlock->vars[index],n) == 0);
- else {
- peepBlock->vars[index] = n; //PCI(pcs)->pcop->name;
- return 1;
- }
- }
- }
- } else
- /* The pcd has no operand. Lines match if pcs has no operand either*/
- return (PCI(pcs)->pcop == NULL);
- }
- }
-
-
- if((pcd->type == PC_WILD) && (pcs->type == PC_OPCODE)) {
-
- int labindex;
-
- index = PCW(pcd)->id;
-
- fprintf(stderr,"%s comparing wild cards\n",__FUNCTION__);
- pcs->print(stderr,pcs);
- pcd->print(stderr,pcd);
-
- peepBlock->wildpCodes[PCW(pcd)->id] = pcs;
-
- /* Check for a label associated with this wild pCode */
- // If the wild card has a label, make sure the source code does too.
- if(PCW(pcd)->label) {
- if(!pcs->label)
- return 0;
-
- labindex = PCOW(PCW(pcd)->label)->id;
- if(peepBlock->vars[labindex] == NULL) {
- // First time to encounter this label
- peepBlock->vars[labindex] = PCL(pcs->label->pc)->label;
- fprintf(stderr,"first time for a label\n");
- } else {
- if(strcmp(peepBlock->vars[labindex],PCL(pcs->label->pc)->label) != 0) {
- fprintf(stderr,"labels don't match\n");
- return 0;
- }
- fprintf(stderr,"matched a label\n");
- }
-
- }
-
- if(PCW(pcd)->operand) {
- PCOW(PCI(pcd)->pcop)->matched = PCI(pcs)->pcop;
- if(peepBlock->vars[index]) {
- int i = (strcmp(peepBlock->vars[index],PCI(pcs)->pcop->name) == 0);
- if(i)
- fprintf(stderr," (matched)\n");
- else {
- fprintf(stderr," (no match: wild card operand mismatch\n");
- fprintf(stderr," peepblock= %s, pcodeop= %s\n",
- peepBlock->vars[index],
- PCI(pcs)->pcop->name);
- }
- return i;
- } else {
- peepBlock->vars[index] = PCI(pcs)->pcop->name;
- return 1;
- }
- }
-
- pcs = findNextInstruction(pcs->next);
- if(pcs) {
- fprintf(stderr," (next to match)\n");
- pcs->print(stderr,pcs);
- }
-
- return 1; /* wild card matches */
- }
-
- return 0;
-}
-
-/*-----------------------------------------------------------------*/
-/*-----------------------------------------------------------------*/
-void pCodePeepClrVars(pCodePeep *pcp)
-{
-
- int i;
-
- for(i=0;i<pcp->nvars; i++)
- pcp->vars[i] = NULL;
-
-}
-
-/*-----------------------------------------------------------------*/
-/*-----------------------------------------------------------------*/
-void pCodeInsertAfter(pCode *pc1, pCode *pc2)
-{
-
- if(!pc1 || !pc2)
- return;
-
- pc2->next = pc1->next;
- if(pc1->next)
- pc1->next->prev = pc2;
-
- pc2->prev = pc1;
- pc1->next = pc2;
-
-}
-
-/*-----------------------------------------------------------------*/
-/* pCodeOpCopy - copy a pcode operator */
-/*-----------------------------------------------------------------*/
-static pCodeOp *pCodeOpCopy(pCodeOp *pcop)
-{
- pCodeOp *pcopnew=NULL;
-
- if(!pcop)
- return NULL;
-
- switch(pcop->type) {
- case PO_CRY:
- case PO_BIT:
- pcopnew = Safe_calloc(1,sizeof(pCodeOpBit) );
- PCOB(pcopnew)->bit = PCOB(pcop)->bit;
- PCOB(pcopnew)->inBitSpace = PCOB(pcop)->inBitSpace;
-
- break;
-
- case PO_WILD:
- /* Here we expand the wild card into the appropriate type: */
- /* By recursively calling pCodeOpCopy */
- if(PCOW(pcop)->matched)
- pcopnew = pCodeOpCopy(PCOW(pcop)->matched);
- else {
- // Probably a label
- pcopnew = pCodeOpCopy(PCOW(pcop)->subtype);
- pcopnew->name = Safe_strdup(PCOW(pcop)->pcp->vars[PCOW(pcop)->id]);
- fprintf(stderr,"copied a wild op named %s\n",pcopnew->name);
- }
-
- return pcopnew;
- break;
-
- case PO_LABEL:
- pcopnew = Safe_calloc(1,sizeof(pCodeOpLabel) );
- PCOLAB(pcopnew)->key = PCOLAB(pcop)->key;
- break;
-
- case PO_LITERAL:
- case PO_IMMEDIATE:
- pcopnew = Safe_calloc(1,sizeof(pCodeOpLit) );
- PCOL(pcopnew)->lit = PCOL(pcop)->lit;
- break;
-
- case PO_GPR_REGISTER:
- case PO_GPR_TEMP:
- case PO_SFR_REGISTER:
- case PO_DIR:
- case PO_STR:
- case PO_NONE:
- case PO_W:
- case PO_STATUS:
- case PO_FSR:
- case PO_INDF:
-
- pcopnew = Safe_calloc(1,sizeof(pCodeOp) );
-
- }
-
- pcopnew->type = pcop->type;
- pcopnew->name = Safe_strdup(pcop->name);
-
- return pcopnew;
-}
-
-#if 0
-/*-----------------------------------------------------------------*/
-/* pCodeCopy - copy a pcode */
-/*-----------------------------------------------------------------*/
-static pCode *pCodeCopy(pCode *pc)
-{
-
- pCode *pcnew;
-
- pcnew = newpCode(pc->type,pc->pcop);
-}
-#endif
-/*-----------------------------------------------------------------*/
-/*-----------------------------------------------------------------*/
-void pCodeDeleteChain(pCode *f,pCode *t)
-{
- pCode *pc;
-
- while(f && f!=t) {
- fprintf(stderr,"delete pCode:\n");
- pc = f->next;
- f->print(stderr,f);
- //f->delete(f);
- f = pc;
- }
-
-}
-/*-----------------------------------------------------------------*/
-/*-----------------------------------------------------------------*/
-int pCodePeepMatchRule(pCode *pc)
-{
- pCodePeep *peepBlock;
- pCode *pct, *pcin;
- _DLL *peeprules;
- int matched;
-
- peeprules = (_DLL *)peepSnippets;
-
- while(peeprules) {
- peepBlock = ((pCodePeepSnippets*)peeprules)->peep;
- pCodePeepClrVars(peepBlock);
-
- pcin = pc;
- pct = peepBlock->target->pcHead;
- matched = 0;
- while(pct && pcin) {
-
- if(! (matched = pCodePeepMatchLine(peepBlock, pcin,pct)))
- break;
-
- pcin = findNextInstruction(pcin->next);
- pct = pct->next;
- //debug:
- fprintf(stderr," matched\n");
- if(!pcin)
- fprintf(stderr," end of code\n");
- if(!pct)
- fprintf(stderr," end of rule\n");
- }
-
- if(matched && pcin) {
-
- /* So far we matched the rule up to the point of the conditions .
- * In other words, all of the opcodes match. Now we need to see
- * if the post conditions are satisfied.
- * First we check the 'postFalseCond'. This means that we check
- * to see if any of the subsequent pCode's in the pCode chain
- * following the point just past where we have matched depend on
- * the `postFalseCond' as input then we abort the match
- */
- fprintf(stderr," matched rule so far, now checking conditions\n");
- if (peepBlock->postFalseCond &&
- (pCodeSearchCondition(pcin,peepBlock->postFalseCond) > 0) )
- matched = 0;
- }
-
- if(matched && pcin) {
-
- pCode *pcprev;
- pCode *pcr;
-
-
- /* We matched a rule! Now we have to go through and remove the
- inefficient code with the optimized version */
-
- fprintf(stderr, "Found a pcode peep match:\nRule:\n");
- printpCodeString(stderr,peepBlock->target->pcHead,10);
- fprintf(stderr,"first thing matched\n");
- pc->print(stderr,pc);
- fprintf(stderr,"last thing matched\n");
- pcin->print(stderr,pcin);
-
- /* Unlink the original code */
- pcprev = pc->prev;
- pcprev->next = pcin;
- pcin->prev = pc->prev;
- pCodeDeleteChain(pc,pcin);
-
- /* Generate the replacement code */
- pc = pcprev;
- pcr = peepBlock->replace->pcHead; // This is the replacement code
- while (pcr) {
- pCodeOp *pcop=NULL;
- /* If the replace pcode is an instruction with an operand, */
- /* then duplicate the operand (and expand wild cards in the process). */
- if(pcr->type == PC_OPCODE) {
- if(PCI(pcr)->pcop)
- pcop = pCodeOpCopy(PCI(pcr)->pcop);
-
- pCodeInsertAfter(pc, newpCode(PCI(pcr)->op,pcop));
- } else if (pcr->type == PC_WILD) {
- pCodeInsertAfter(pc,peepBlock->wildpCodes[PCW(pcr)->id]);
- }
-
-
- pc = pc->next;
- pc->print(stderr,pc);
- pcr = pcr->next;
- }
-
- return 1;
- }
-
- peeprules = peeprules->next;
- }
-
- return 0;
-}
projects / fw / sdcc / blobdiff