1 /*-------------------------------------------------------------------------
3 pcoderegs.c - post code generation register optimizations
5 Written By - Scott Dattalo scott@dattalo.com
6 Ported To PIC16 By - m.dubuc@rogers.com
8 This program is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by the
10 Free Software Foundation; either version 2, or (at your option) any
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 -------------------------------------------------------------------------*/
27 The purpose of the code in this file is to optimize the register usage.
32 #include "common.h" // Include everything in the SDCC src directory
37 #include "pcoderegs.h"
38 #include "pcodeflow.h"
40 extern void pic16_pCodeInsertAfter(pCode *pc1, pCode *pc2);
41 extern pCode * pic16_findPrevInstruction(pCode *pci);
42 extern pBranch * pic16_pBranchAppend(pBranch *h, pBranch *n);
43 void pic16_unlinkpCode(pCode *pc);
44 extern int pic16_pCodeSearchCondition(pCode *pc, unsigned int cond);
46 static int total_registers_saved=0;
47 static int register_optimization=1;
49 /*-----------------------------------------------------------------*
50 * void AddRegToFlow(regs *reg, pCodeFlow *pcfl)
51 *-----------------------------------------------------------------*/
53 void AddRegToFlow(regs *reg, pCodeFlow *pcfl)
56 if(!reg || ! pcfl || !isPCFL(pcflow))
60 pcfl->registers = newSet();
66 /*-----------------------------------------------------------------*
68 *-----------------------------------------------------------------*/
70 static void dbg_regusage(set *fregs)
77 for (reg = setFirstItem(fregs) ; reg ;
78 reg = setNextItem(fregs)) {
80 if(elementsInSet(reg->reglives.usedpCodes)) {
82 fprintf (stderr, "%s addr=0x%03x rIdx=0x%03x",
87 pcfl = setFirstItem(reg->reglives.usedpFlows);
89 fprintf(stderr, "\n used in seq");
92 fprintf(stderr," 0x%03x",pcfl->seq);
93 pcfl = setNextItem(reg->reglives.usedpFlows);
96 pcfl = setFirstItem(reg->reglives.assignedpFlows);
98 fprintf(stderr, "\n assigned in seq");
101 fprintf(stderr," 0x%03x",pcfl->seq);
102 pcfl = setNextItem(reg->reglives.assignedpFlows);
105 pc = setFirstItem(reg->reglives.usedpCodes);
107 fprintf(stderr, "\n used in instructions ");
110 pcfl = PCODE(PCI(pc)->pcflow);
112 fprintf(stderr," 0x%03x:",pcfl->seq);
113 fprintf(stderr,"0x%03x",pc->seq);
115 pc = setNextItem(reg->reglives.usedpCodes);
118 fprintf(stderr, "\n");
124 /*-----------------------------------------------------------------*
126 *-----------------------------------------------------------------*/
128 static void dbg_dumpregusage(void)
131 fprintf(stderr,"*** Register Usage ***\n");
132 fprintf(stderr,"InternalRegs:\n");
133 dbg_regusage(pic16_dynInternalRegs);
134 fprintf(stderr,"AllocRegs:\n");
135 dbg_regusage(pic16_dynAllocRegs);
136 fprintf(stderr,"StackRegs:\n");
137 dbg_regusage(pic16_dynStackRegs);
138 fprintf(stderr,"DirectRegs:\n");
139 dbg_regusage(pic16_dynDirectRegs);
140 fprintf(stderr,"DirectBitRegs:\n");
141 dbg_regusage(pic16_dynDirectBitRegs);
142 fprintf(stderr,"ProcessorRegs:\n");
143 dbg_regusage(pic16_dynProcessorRegs);
148 /*-----------------------------------------------------------------*
149 * void pCodeRegMapLiveRangesInFlow(pCodeFlow *pcfl)
150 *-----------------------------------------------------------------*/
151 static void pCodeRegMapLiveRangesInFlow(pCodeFlow *pcfl)
163 pc = pic16_findNextInstruction(pcfl->pc.next);
165 while(pic16_isPCinFlow(pc,PCODE(pcfl))) {
168 reg = pic16_getRegFromInstruction(pc);
170 if(reg && (reg->type != REG_TMP)) {
173 fprintf(stderr, "reg= %p\n", reg);
174 fprintf(stderr, "flow seq %d, inst seq %d %s ",PCODE(pcfl)->seq,pc->seq,reg->name);
175 fprintf(stderr, "addr = 0x%03x, type = %d rIdx=0x%03x ",
176 reg->address,reg->type,reg->rIdx);
177 fprintf(stderr, "command = %s\n", PCI(pc)->mnemonic);
181 // fprintf(stderr, "%s:%d: trying to get first operand from pCode reg= %s\n", __FILE__, __LINE__, reg->name);
182 addSetIfnotP(& (PCFL(pcfl)->registers), reg);
184 if((PCC_REGISTER | PCC_LITERAL) & PCI(pc)->inCond)
185 addSetIfnotP(& (reg->reglives.usedpFlows), pcfl);
187 if(PCC_REGISTER & PCI(pc)->outCond)
188 addSetIfnotP(& (reg->reglives.assignedpFlows), pcfl);
190 addSetIfnotP(& (reg->reglives.usedpCodes), pc);
193 /* check to see if this pCode has 2 memory operands,
194 and set up the second operand too */
195 if(PCI(pc)->is2MemOp) {
196 reg = pic16_getRegFromInstruction2(pc);
198 // fprintf(stderr, "%s:%d: trying to get second operand from pCode reg= %s\n", __FILE__, __LINE__, reg->name);
199 addSetIfnotP(& (PCFL(pcfl)->registers), reg);
201 if((PCC_REGISTER | PCC_LITERAL) & PCI(pc)->inCond)
202 addSetIfnotP(& (reg->reglives.usedpFlows), pcfl);
204 if((PCC_REGISTER | PCC_REGISTER2) & PCI(pc)->outCond)
205 addSetIfnotP(& (reg->reglives.assignedpFlows), pcfl);
207 addSetIfnotP(& (reg->reglives.usedpCodes), pc);
216 pc = pic16_findNextInstruction(pc->next);
222 /*-----------------------------------------------------------------*
223 * void pic16_pCodeRegMapLiveRanges(pBlock *pb)
224 *-----------------------------------------------------------------*/
225 void pic16_pCodeRegMapLiveRanges(pBlock *pb)
229 for( pcflow = pic16_findNextpCode(pb->pcHead, PC_FLOW);
231 pcflow = pic16_findNextpCode(pcflow->next, PC_FLOW) ) {
233 if(!isPCFL(pcflow)) {
234 fprintf(stderr, "pCodeRegMapLiveRanges - pcflow is not a flow object ");
237 pCodeRegMapLiveRangesInFlow(PCFL(pcflow));
241 for( pcflow = pic16_findNextpCode(pb->pcHead, PC_FLOW);
243 pcflow = pic16_findNextpCode(pcflow->next, PC_FLOW) ) {
245 regs *r = setFirstItem(PCFL(pcflow)->registers);
246 fprintf(stderr,"flow seq %d\n", pcflow->seq);
249 fprintf(stderr, " %s\n",r->name);
250 r = setNextItem(PCFL(pcflow)->registers);
257 // dbg_dumpregusage();
262 /*-----------------------------------------------------------------*
264 *-----------------------------------------------------------------*/
265 static void Remove1pcode(pCode *pc, regs *reg)
272 deleteSetItem (&(reg->reglives.usedpCodes),pc);
275 fprintf(stderr,"removing instruction:\n");
276 pc->print(stderr,pc);
280 pcn = pic16_findNextInstruction(pc->next);
283 PCI(pcn)->label = pic16_pBranchAppend(PCI(pcn)->label,PCI(pc)->label);
288 pcn = pic16_findNextInstruction(pc->next);
291 if(PCI(pcn)->cline) {
293 fprintf(stderr, "source line has been optimized completely out\n");
294 pc->print(stderr,pc);
297 PCI(pcn)->cline = PCI(pc)->cline;
306 /*-----------------------------------------------------------------*
307 * void RemoveRegsFromSet(set *regset)
309 *-----------------------------------------------------------------*/
310 static void RemoveRegsFromSet(set *regset)
317 regset = regset->next;
319 used = elementsInSet(reg->reglives.usedpCodes);
323 // fprintf(stderr," reg %s isfree=%d, wasused=%d\n",reg->name,reg->isFree,reg->wasUsed);
327 // fprintf(stderr,"%s:%d: getting rid of reg %s\n",__FILE__, __LINE__, reg->name);
335 pc = setFirstItem(reg->reglives.usedpCodes);
337 if(reg->type == REG_SFR) {
338 fprintf(stderr, "not removing SFR reg %s even though used only once\n", reg->name);
344 pCode *pcn = pic16_findNextInstruction(pc->next);
346 if(pcn && PCI(pcn)->label) {
347 //fprintf(stderr,"can't delete instruction with label...\n");
348 //pc->print(stderr,pc);
351 /* Move the label to the next instruction */
353 PCI(pcn)->label = PCI(pc)->label;
358 regs *r = pic16_getRegFromInstruction(pc);
359 fprintf(stderr, "WARNING, a skip instruction is being optimized out\n");
360 pc->print(stderr,pc);
361 fprintf(stderr,"reg %s, type =%d\n",r->name, r->type);
365 pc->print(stderr, pc);
367 fprintf(stderr,"%s:%d: removing reg %s because it is used only once\n",__FILE__, __LINE__, reg->name);
370 Remove1pcode(pc, reg);
372 pic16_unlinkpCode(pc);
373 deleteSetItem (&(reg->reglives.usedpCodes),pc);
377 total_registers_saved++; // debugging stats.
384 /*-----------------------------------------------------------------*
385 * void pic16_RemoveUnusedRegisters(void)
387 *-----------------------------------------------------------------*/
388 void pic16_RemoveUnusedRegisters(void)
390 /* First, get rid of registers that are used only one time */
392 //RemoveRegsFromSet(pic16_dynInternalRegs);
393 RemoveRegsFromSet(pic16_dynAllocRegs);
394 RemoveRegsFromSet(pic16_dynStackRegs);
396 don't do DirectRegs yet - there's a problem with arrays
397 RemoveRegsFromSet(pic16_dynDirectRegs);
399 RemoveRegsFromSet(pic16_dynDirectBitRegs);
401 if(total_registers_saved && pic16_pcode_verbose)
402 fprintf(stderr, " *** Saved %d registers ***\n", total_registers_saved);
405 static int insideLRBlock(pCode *pc)
412 if(isPCINFO(pc1) && (PCINF(pc1)->type == INF_LOCALREGS)) {
413 t1 = PCOLR (PCINF (pc1)->oper1)->type;
421 if(isPCINFO(pc1) && (PCINF(pc1)->type == INF_LOCALREGS)) {
422 t2 = PCOLR (PCINF (pc1)->oper1)->type;
428 if((t1 == LR_ENTRY_BEGIN && t2 == LR_ENTRY_END)
429 || (t1 == LR_EXIT_BEGIN && t2 == LR_EXIT_END))
436 static void RemoveRegFromLRBlock(regs *reg)
438 if(elementsInSet(reg->reglives.usedpCodes) == 2) {
441 /* only continue if there are just 2 uses of the register,
442 * in in the local *entry* block and one in the local *exit* block */
444 /* search for entry block */
445 pc1 = indexSet(reg->reglives.usedpCodes, 1);
447 if(insideLRBlock( pc1 )) {
448 fprintf(stderr, "usedpCodes[0] inside LR block\n");
449 deleteSetItem(&pc1->pb->tregisters, PCOR(PCI(pc1)->pcop)->r);
450 Remove1pcode(pc1, reg);
453 pc1 = indexSet(reg->reglives.usedpCodes, 0);
454 if(insideLRBlock( pc1 )) {
455 fprintf(stderr, "usedpCodes[1] inside LR block\n");
456 deleteSetItem(&pc1->pb->tregisters, PCOR(PCI(pc1)->pcop)->r);
457 Remove1pcode(pc1, reg);
468 /*-----------------------------------------------------------------*
470 *-----------------------------------------------------------------*/
471 static void Remove2pcodes(pCode *pcflow, pCode *pc1, pCode *pc2, regs *reg, int can_free)
477 fprintf(stderr,"removing 2 instructions:\n");
478 pc1->print(stderr,pc1);
479 pc2->print(stderr,pc2);
483 Remove1pcode(pc1, reg);
486 Remove1pcode(pc2, reg);
487 deleteSetItem (&(PCFL(pcflow)->registers), reg);
496 pCodeRegMapLiveRangesInFlow(PCFL(pcflow));
499 // fprintf(stderr, "register %s is used in %d pCodes, assigned in %d pCodes\n", reg->name,
500 // elementsInSet(reg->reglives.usedpCodes),
501 // elementsInSet(reg->reglives.assignedpFlows));
503 RemoveRegFromLRBlock(reg);
508 /*-----------------------------------------------------------------*
510 *-----------------------------------------------------------------*/
511 static int regUsedinRange(pCode *pc1, pCode *pc2, regs *reg)
517 testreg = pic16_getRegFromInstruction(pc1);
518 if(testreg && (testreg->rIdx == reg->rIdx)) {
522 if(PCI(pc1)->is2MemOp) {
523 testreg = pic16_getRegFromInstruction2(pc1);
524 if(testreg && (testreg->rIdx == reg->rIdx)) {
529 pc1 = pic16_findNextInstruction(pc1->next);
531 } while (pc1 && (pc1 != pc2) && (i++ < 100)) ;
534 fprintf(stderr, "warning, regUsedinRange searched through too many pcodes\n");
539 /*-----------------------------------------------------------------*
540 * void pCodeOptime2pCodes(pCode *pc1, pCode *pc2)
542 * ADHOC pattern checking
543 * Now look for specific sequences that are easy to optimize.
544 * Many of these sequences are characteristic of the compiler
545 * (i.e. it'd probably be a waste of time to apply these adhoc
546 * checks to hand written assembly.)
549 *-----------------------------------------------------------------*/
550 static int pCodeOptime2pCodes(pCode *pc1, pCode *pc2, pCode *pcfl_used, regs *reg, int can_free, int optimize_level)
555 int t = total_registers_saved;
557 if(reg->type == REG_SFR)return 0;
559 if(pc2->seq < pc1->seq) {
565 fprintf(stderr,"pCodeOptime2pCodes\n");
566 pc1->print(stderr,pc1);
567 pc2->print(stderr,pc2);
569 if((PCI(pc1)->op == POC_CLRF) && (PCI(pc2)->op == POC_MOVFW) ){
583 //fprintf(stderr, " CLRF/MOVFW. instruction after MOVFW is:\n");
584 pct1 = pic16_findNextInstruction(pc2->next);
586 if(PCI(pct1)->op == POC_MOVWF) {
587 newpc = pic16_newpCode(POC_CLRF, PCI(pct1)->pcop);
588 pct1->destruct(pct1);
590 newpc = pic16_newpCode(POC_MOVLW, pic16_newpCodeOpLit(0));
593 pic16_pCodeInsertAfter(pc2, newpc);
594 PCI(newpc)->pcflow = PCFL(pcfl_used);
595 newpc->seq = pc2->seq;
597 /* take care if register is used after pc2, if yes, then don't delete
598 * clrf reg, because, reg should be initialized with zero */
603 for(spc=setFirstItem(reg->reglives.usedpCodes);spc;spc=setNextItem(reg->reglives.usedpCodes)) {
604 if(maxSeq < spc->seq)maxSeq = spc->seq;
607 // fprintf(stderr, "pc1->seq = %d\tpc2->seq = %d\tspc->seq = %d\n", pc1->seq, pc2->seq, maxSeq);
609 if(maxSeq > pc2->seq) {
610 /* this means that a pCode uses register after pc2, then
611 * we can't delete pc1 pCode */
612 Remove2pcodes(pcfl_used, NULL, pc2, reg, can_free);
614 /* we can remove both pCodes */
615 Remove2pcodes(pcfl_used, pc1, pc2, reg, can_free);
618 total_registers_saved++; // debugging stats.
620 } else if((PCI(pc1)->op == POC_CLRF) && (PCI(pc2)->op == POC_IORFW) ){
621 //fprintf(stderr, " CLRF/IORFW.\n");
623 pct2 = pic16_findNextInstruction(pc2->next);
625 if(pic16_pCodeSearchCondition(pct2, PCC_Z) > 0) {
626 pct2 = pic16_newpCode(POC_IORLW, pic16_newpCodeOpLit(0));
627 pct2->seq = pc2->seq;
628 PCI(pct2)->pcflow = PCFL(pcfl_used);
629 pic16_pCodeInsertAfter(pc1,pct2);
631 Remove2pcodes(pcfl_used, pc1, pc2, reg, can_free);
632 total_registers_saved++; // debugging stats.
634 } else if(PCI(pc1)->op == POC_MOVWF) {
636 reg1 = pic16_getRegFromInstruction(pc1);
638 if(reg1->type == REG_SFR)return (total_registers_saved != t);
640 pct2 = pic16_findNextInstruction(pc2->next);
642 if(PCI(pc2)->op == POC_MOVFW) {
645 fprintf(stderr, " MOVWF/MOVFW. instruction after MOVFW is:\n");
646 pct2->print(stderr,pct2);
649 if(PCI(pct2)->op == POC_MOVWF) {
664 reg2 = pic16_getRegFromInstruction(pct2);
665 if(reg2 && !regUsedinRange(pc1,pc2,reg2) && (reg2->type != REG_SFR)) {
666 // if(reg2 && !regUsedinRange(pc1,pc2,reg2))
668 if(pic16_pCodeSearchCondition(pct2, PCC_Z) < 1) {
669 pCode *pct3 = pic16_findNextInstruction(pct2->next);
670 pct2->seq = pc1->seq;
671 pic16_unlinkpCode(pct2);
672 pic16_pCodeInsertAfter(pic16_findPrevInstruction(pc1->prev),pct2);
674 #define usesW(x) ((x) && (isPCI(x)) && ( (PCI(x)->inCond & PCC_W) != 0))
677 ; // Remove2pcodes(pcfl_used, pc1, NULL, reg, can_free);
679 Remove2pcodes(pcfl_used, pc1, pc2, reg, can_free);
680 total_registers_saved++; // debugging stats.
684 // fprintf(stderr,"didn't optimize because Z bit is used\n");
688 fprintf(stderr, " couldn't optimize\n");
690 fprintf(stderr, " %s is used in range\n", reg2->name);
692 fprintf(stderr, " reg2 is NULL\n");
697 pct1 = pic16_findPrevInstruction(pc1->prev);
698 if(pct1 && (PCI(pct1)->pcflow == PCI(pc1)->pcflow)) {
700 if ( (PCI(pct1)->op == POC_MOVFW) &&
701 (PCI(pc2)->op == POC_MOVFW)) {
703 reg1 = pic16_getRegFromInstruction(pct1);
704 if(reg1 && !regUsedinRange(pc1,pc2,reg1)) {
707 fprintf(stderr, " MOVF/MOVFW. \n");
708 fprintf(stderr, " ...optimizing\n");
726 Or, if we're not deleting the register then the "To" is:
735 pct2 = pic16_newpCode(PCI(pc2)->op, PCI(pct1)->pcop);
736 pic16_pCodeInsertAfter(pc2, pct2);
737 PCI(pct2)->pcflow = PCFL(pcfl_used);
738 pct2->seq = pc2->seq;
741 Remove2pcodes(pcfl_used, pc1, pc2, reg, can_free);
743 /* If we're not freeing the register then that means (probably)
744 * the register is needed somewhere else.*/
745 pic16_unlinkpCode(pc1);
746 pic16_pCodeInsertAfter(pct2, pc1);
748 Remove2pcodes(pcfl_used, pc2, NULL, reg, can_free);
751 Remove2pcodes(pcfl_used, pct1, NULL, reg1, 0);
752 total_registers_saved++; // debugging stats.
755 } else if ( (PCI(pct1)->op == POC_MOVWF) &&
756 (PCI(pc2)->op == POC_MOVFW)) {
758 // fprintf(stderr,"movwf MOVWF/MOVFW\n");
760 if(optimize_level > 1 && can_free) {
761 pct2 = pic16_newpCode(POC_MOVFW, PCI(pc1)->pcop);
762 pic16_pCodeInsertAfter(pc2, pct2);
763 Remove2pcodes(pcfl_used, pc1, pc2, reg, 1);
764 total_registers_saved++; // debugging stats.
773 return (total_registers_saved != t);
776 /*-----------------------------------------------------------------*
777 * void pCodeRegOptimeRegUsage(pBlock *pb)
778 *-----------------------------------------------------------------*/
779 static void OptimizeRegUsage(set *fregs, int optimize_multi_uses, int optimize_level)
783 pCode *pc1=NULL, *pc2=NULL;
787 pCode *pcfl_used, *pcfl_assigned;
789 /* Step through the set by directly accessing the 'next' pointer.
790 * We could also step through by using the set API, but the
791 * the (debug) calls to print instructions affect the state
792 * of the set pointers */
797 if(reg->type == REG_SFR) {
798 // fprintf(stderr,"skipping SFR: %s\n",reg->name);
802 pcfl_used = setFirstItem(reg->reglives.usedpFlows);
803 pcfl_assigned = setFirstItem(reg->reglives.assignedpFlows);
805 used = elementsInSet(reg->reglives.usedpCodes);
806 // fprintf(stderr, "%s:%d register %s used %d times in pCode\n", __FILE__, __LINE__, reg->name, used);
810 * In this section, all registers that are used in only in two
811 * instructions are examined. If possible, they're optimized out.
815 fprintf (stderr, "OptimizeRegUsage: %s addr=0x%03x rIdx=0x%03x type=%d used=%d\n",
818 reg->rIdx, reg->type, used);
821 pc1 = setFirstItem(reg->reglives.usedpCodes);
822 pc2 = setNextItem(reg->reglives.usedpCodes);
824 if(pcfl_used && pcfl_assigned) {
827 expected case - the register has been assigned a value and is
831 //fprintf(stderr," used only twice\n");
832 if(pcfl_used->seq == pcfl_assigned->seq && !(setNextItem(reg->reglives.usedpFlows)) && !(setNextItem(reg->reglives.assignedpFlows))) {
834 //fprintf(stderr, " and used in same flow\n");
836 pCodeOptime2pCodes(pc1, pc2, pcfl_used, reg, 1,optimize_level);
839 // fprintf(stderr, " and used in different flows\n");
843 } else if(pcfl_used) {
846 register has been used twice without ever being assigned */
847 //fprintf(stderr,"WARNING %s: reg %s used without being assigned\n",__FUNCTION__,reg->name);
850 // fprintf(stderr,"WARNING %s: reg %s assigned without being used\n",__FUNCTION__,reg->name);
851 Remove2pcodes(pcfl_assigned, pc1, pc2, reg, 1);
852 total_registers_saved++; // debugging stats.
856 /* register has been used either once, or more than twice */
858 if(used && !pcfl_used && pcfl_assigned) {
861 fprintf(stderr,"WARNING %s: reg %s assigned without being used\n",__FUNCTION__,reg->name);
863 pc = setFirstItem(reg->reglives.usedpCodes);
866 pcfl_assigned = PCODE(PCI(pc)->pcflow);
867 Remove1pcode(pc, reg);
869 deleteSetItem (&(PCFL(pcfl_assigned)->registers), reg);
871 deleteSetItem (&(reg->reglives.usedpCodes),pc);
874 pc = setNextItem(reg->reglives.usedpCodes);
881 total_registers_saved++; // debugging stats.
882 } else if( (used > 2) && optimize_multi_uses) {
888 pCodeFlow *pcfl1=NULL, *pcfl2=NULL;
890 /* examine the number of times this register is used */
893 rset1 = reg->reglives.usedpCodes;
894 while(rset1 && searching) {
899 if(pc1 && isPCI(pc1) && ( (pcfl1 = PCI(pc1)->pcflow) != NULL) ) {
901 //while(rset2 && searching) {
905 if(pc2 && isPCI(pc2) && ( (pcfl2 = PCI(pc2)->pcflow) != NULL) ) {
908 if(pCodeOptime2pCodes(pc1, pc2, pcfl_used, reg, 0,optimize_level))
913 //rset2 = rset2->next;
925 /*-----------------------------------------------------------------*
926 * void pic16_pCodeRegOptimeRegUsage(pBlock *pb)
927 *-----------------------------------------------------------------*/
928 void pic16_pCodeRegOptimizeRegUsage(int level)
933 int t = total_registers_saved;
935 if(getenv("NO_REG_OPT"))
938 if(!register_optimization)
945 saved = total_registers_saved;
947 /* Identify registers used in one flow sequence */
948 OptimizeRegUsage(pic16_dynAllocRegs,level, (OPT_PASSES-passes));
949 OptimizeRegUsage(pic16_dynStackRegs,level, (OPT_PASSES-passes));
950 OptimizeRegUsage(pic16_dynDirectRegs,0, (OPT_PASSES-passes));
952 if((total_registers_saved != saved)
953 && (pic16_pcode_verbose))
954 fprintf(stderr, " *** pass %d, Saved %d registers, total saved %d ***\n",
955 (1+OPT_PASSES-passes),total_registers_saved-saved,total_registers_saved);
959 } while( passes && ((total_registers_saved != saved) || (passes==OPT_PASSES-1)) );
961 if(total_registers_saved == t)
962 if(pic16_debug_verbose)
963 fprintf(stderr, "No registers saved on this pass\n");
967 fprintf(stderr,"dynamically allocated regs:\n");
968 dbg_regusage(pic16_dynAllocRegs);
969 fprintf(stderr,"stack regs:\n");
970 dbg_regusage(pic16_dynStackRegs);
971 fprintf(stderr,"direct regs:\n");
972 dbg_regusage(pic16_dynDirectRegs);
977 /*-----------------------------------------------------------------*
978 * void RegsUnMapLiveRanges(set *regset)
980 *-----------------------------------------------------------------*/
981 static void RegsSetUnMapLiveRanges(set *regset)
987 regset = regset->next;
989 deleteSet(®->reglives.usedpCodes);
990 deleteSet(®->reglives.usedpFlows);
991 deleteSet(®->reglives.assignedpFlows);
997 void pic16_RegsUnMapLiveRanges(void)
999 RegsSetUnMapLiveRanges(pic16_dynAllocRegs);
1000 RegsSetUnMapLiveRanges(pic16_dynStackRegs);
1001 RegsSetUnMapLiveRanges(pic16_dynDirectRegs);
1002 RegsSetUnMapLiveRanges(pic16_dynProcessorRegs);
1003 RegsSetUnMapLiveRanges(pic16_dynDirectBitRegs);
1004 RegsSetUnMapLiveRanges(pic16_dynInternalRegs);