1 /*****************************************************************************/
5 /* Optimize loads through pointers */
9 /* (C) 2001-2009 Ullrich von Bassewitz */
10 /* Roemerstrasse 52 */
11 /* D-70794 Filderstadt */
12 /* EMail: uz@cc65.org */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
32 /*****************************************************************************/
44 #include "coptptrload.h"
48 /*****************************************************************************/
50 /*****************************************************************************/
54 unsigned OptPtrLoad1 (CodeSeg* S)
55 /* Search for the sequence:
81 /* Walk over the entries */
83 while (I < CS_GetEntryCount (S)) {
88 L[0] = CS_GetEntry (S, I);
90 /* Check for the sequence */
91 if (L[0]->OPC == OP65_CLC &&
92 CS_GetEntries (S, L+1, I+1, 8) &&
93 L[1]->OPC == OP65_ADC &&
94 (L[1]->AM == AM65_ABS ||
95 L[1]->AM == AM65_ZP ||
96 L[1]->AM == AM65_IMM) &&
97 L[2]->OPC == OP65_TAY &&
98 L[3]->OPC == OP65_TXA &&
99 L[4]->OPC == OP65_ADC &&
100 L[5]->OPC == OP65_TAX &&
101 L[6]->OPC == OP65_TYA &&
102 L[7]->OPC == OP65_LDY &&
103 CE_IsKnownImm (L[7], 0) &&
104 CE_IsCallTo (L[8], "ldauidx") &&
105 !CS_RangeHasLabel (S, I+1, 8)) {
110 /* Track the insertion point */
114 X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[2]->LI);
115 CS_InsertEntry (S, X, IP++);
117 /* If the instruction before the clc is a ldx, replace the
118 * txa by an lda with the same location of the ldx. Otherwise
119 * transfer the value in X to A.
121 if ((P = CS_GetPrevEntry (S, I)) != 0 &&
122 P->OPC == OP65_LDX &&
124 X = NewCodeEntry (OP65_LDA, P->AM, P->Arg, 0, P->LI);
126 X = NewCodeEntry (OP65_TXA, AM65_IMP, 0, 0, L[3]->LI);
128 CS_InsertEntry (S, X, IP++);
130 /* clc is now in the right place */
134 X = NewCodeEntry (OP65_ADC, L[4]->AM, L[4]->Arg, 0, L[4]->LI);
135 CS_InsertEntry (S, X, IP++);
138 X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1+1", 0, L[5]->LI);
139 CS_InsertEntry (S, X, IP++);
142 X = NewCodeEntry (OP65_LDY, L[1]->AM, L[1]->Arg, 0, L[1]->LI);
143 CS_InsertEntry (S, X, IP++);
146 X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[8]->LI);
147 CS_InsertEntry (S, X, IP++);
150 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[8]->LI);
151 CS_InsertEntry (S, X, IP++);
153 /* Remove the old instructions */
154 CS_DelEntries (S, IP, 8);
156 /* Remember, we had changes */
166 /* Return the number of changes made */
172 unsigned OptPtrLoad2 (CodeSeg* S)
173 /* Search for the sequence:
198 unsigned Changes = 0;
200 /* Walk over the entries */
202 while (I < CS_GetEntryCount (S)) {
207 L[0] = CS_GetEntry (S, I);
209 /* Check for the sequence */
210 if (L[0]->OPC == OP65_ADC &&
211 CS_GetEntries (S, L+1, I+1, 8) &&
212 L[1]->OPC == OP65_PHA &&
213 L[2]->OPC == OP65_TXA &&
214 L[3]->OPC == OP65_INY &&
215 L[4]->OPC == OP65_ADC &&
216 L[5]->OPC == OP65_TAX &&
217 L[6]->OPC == OP65_PLA &&
218 L[7]->OPC == OP65_LDY &&
219 CE_IsCallTo (L[8], "ldauidx") &&
220 !CS_RangeHasLabel (S, I+1, 8)) {
224 /* Store the low byte and remove the PHA instead */
225 X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[0]->LI);
226 CS_InsertEntry (S, X, I+1);
228 /* Store the high byte */
229 X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1+1", 0, L[4]->LI);
230 CS_InsertEntry (S, X, I+6);
232 /* Load high and low byte */
233 X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[6]->LI);
234 CS_InsertEntry (S, X, I+10);
235 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[6]->LI);
236 CS_InsertEntry (S, X, I+11);
238 /* Delete the old code */
239 CS_DelEntry (S, I+12); /* jsr ldauidx */
240 CS_DelEntry (S, I+8); /* pla */
241 CS_DelEntry (S, I+7); /* tax */
242 CS_DelEntry (S, I+2); /* pha */
244 /* Remember, we had changes */
254 /* Return the number of changes made */
260 unsigned OptPtrLoad3 (CodeSeg* S)
261 /* Search for the sequence:
279 unsigned Changes = 0;
281 /* Walk over the entries */
283 while (I < CS_GetEntryCount (S)) {
289 L[0] = CS_GetEntry (S, I);
291 /* Check for the sequence */
292 if (L[0]->OPC == OP65_LDA &&
293 L[0]->AM == AM65_IMM &&
294 CS_GetEntries (S, L+1, I+1, 7) &&
295 L[1]->OPC == OP65_LDX &&
296 L[1]->AM == AM65_IMM &&
297 L[2]->OPC == OP65_CLC &&
298 L[3]->OPC == OP65_ADC &&
299 (L[3]->AM == AM65_ABS || L[3]->AM == AM65_ZP) &&
300 (L[4]->OPC == OP65_BCC || L[4]->OPC == OP65_JCC) &&
302 L[4]->JumpTo->Owner == L[6] &&
303 L[5]->OPC == OP65_INX &&
304 L[6]->OPC == OP65_LDY &&
305 CE_IsKnownImm (L[6], 0) &&
306 CE_IsCallTo (L[7], "ldauidx") &&
307 !CS_RangeHasLabel (S, I+1, 5) &&
308 !CE_HasLabel (L[7]) &&
309 /* Check the label last because this is quite costly */
310 (Len = strlen (L[0]->Arg)) > 3 &&
311 L[0]->Arg[0] == '<' &&
312 L[0]->Arg[1] == '(' &&
313 strlen (L[1]->Arg) == Len &&
314 L[1]->Arg[0] == '>' &&
315 memcmp (L[0]->Arg+1, L[1]->Arg+1, Len-1) == 0) {
320 /* We will create all the new stuff behind the current one so
321 * we keep the line references.
323 X = NewCodeEntry (OP65_LDY, L[3]->AM, L[3]->Arg, 0, L[0]->LI);
324 CS_InsertEntry (S, X, I+8);
326 X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[0]->LI);
327 CS_InsertEntry (S, X, I+9);
329 Label = memcpy (xmalloc (Len-2), L[0]->Arg+2, Len-3);
331 X = NewCodeEntry (OP65_LDA, AM65_ABSY, Label, 0, L[0]->LI);
332 CS_InsertEntry (S, X, I+10);
335 /* Remove the old code */
336 CS_DelEntries (S, I, 8);
338 /* Remember, we had changes */
348 /* Return the number of changes made */
354 unsigned OptPtrLoad4 (CodeSeg* S)
355 /* Search for the sequence:
376 unsigned Changes = 0;
378 /* Walk over the entries */
380 while (I < CS_GetEntryCount (S)) {
386 L[0] = CS_GetEntry (S, I);
388 /* Check for the sequence */
389 if (L[0]->OPC == OP65_LDA &&
390 L[0]->AM == AM65_IMM &&
391 CS_GetEntries (S, L+1, I+1, 8) &&
392 L[1]->OPC == OP65_LDX &&
393 L[1]->AM == AM65_IMM &&
394 !CE_HasLabel (L[1]) &&
395 L[2]->OPC == OP65_LDY &&
396 CE_IsConstImm (L[2]) &&
397 !CE_HasLabel (L[2]) &&
398 L[3]->OPC == OP65_CLC &&
399 !CE_HasLabel (L[3]) &&
400 L[4]->OPC == OP65_ADC &&
401 L[4]->AM == AM65_ZP_INDY &&
402 !CE_HasLabel (L[4]) &&
403 (L[5]->OPC == OP65_BCC || L[5]->OPC == OP65_JCC) &&
405 L[5]->JumpTo->Owner == L[7] &&
406 !CE_HasLabel (L[5]) &&
407 L[6]->OPC == OP65_INX &&
408 !CE_HasLabel (L[6]) &&
409 L[7]->OPC == OP65_LDY &&
410 CE_IsKnownImm (L[7], 0) &&
411 CE_IsCallTo (L[8], "ldauidx") &&
412 !CE_HasLabel (L[8]) &&
413 /* Check the label last because this is quite costly */
414 (Len = strlen (L[0]->Arg)) > 3 &&
415 L[0]->Arg[0] == '<' &&
416 L[0]->Arg[1] == '(' &&
417 strlen (L[1]->Arg) == Len &&
418 L[1]->Arg[0] == '>' &&
419 memcmp (L[0]->Arg+1, L[1]->Arg+1, Len-1) == 0) {
425 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, L[4]->Arg, 0, L[0]->LI);
426 CS_InsertEntry (S, X, I+3);
429 X = NewCodeEntry (OP65_TAY, AM65_IMP, 0, 0, L[0]->LI);
430 CS_InsertEntry (S, X, I+4);
433 X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[0]->LI);
434 CS_InsertEntry (S, X, I+5);
437 Label = memcpy (xmalloc (Len-2), L[0]->Arg+2, Len-3);
439 X = NewCodeEntry (OP65_LDA, AM65_ABSY, Label, 0, L[0]->LI);
440 CS_InsertEntry (S, X, I+6);
443 /* Remove the old code */
444 CS_DelEntries (S, I, 2);
445 CS_DelEntries (S, I+5, 6);
447 /* Remember, we had changes */
457 /* Return the number of changes made */
463 unsigned OptPtrLoad5 (CodeSeg* S)
464 /* Search for the sequence:
482 unsigned Changes = 0;
484 /* Walk over the entries */
486 while (I < CS_GetEntryCount (S)) {
491 L[0] = CS_GetEntry (S, I);
493 /* Check for the sequence */
494 if (CE_IsCallTo (L[0], "pushax") &&
495 CS_GetEntries (S, L+1, I+1, 5) &&
496 L[1]->OPC == OP65_LDX &&
497 CE_IsKnownImm (L[1], 0) &&
498 L[2]->OPC == OP65_LDA &&
499 (L[2]->AM == AM65_ABS ||
500 L[2]->AM == AM65_ZP ||
501 L[2]->AM == AM65_IMM) &&
502 CE_IsCallTo (L[3], "tosaddax") &&
503 L[4]->OPC == OP65_LDY &&
504 CE_IsKnownImm (L[4], 0) &&
505 CE_IsCallTo (L[5], "ldauidx") &&
506 !CS_RangeHasLabel (S, I+1, 5)) {
511 X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[0]->LI);
512 CS_InsertEntry (S, X, I+6);
515 X = NewCodeEntry (OP65_STX, AM65_ZP, "ptr1+1", 0, L[0]->LI);
516 CS_InsertEntry (S, X, I+7);
519 X = NewCodeEntry (OP65_LDY, L[2]->AM, L[2]->Arg, 0, L[2]->LI);
520 CS_InsertEntry (S, X, I+8);
523 X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[5]->LI);
524 CS_InsertEntry (S, X, I+9);
527 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[5]->LI);
528 CS_InsertEntry (S, X, I+10);
530 /* Remove the old code */
531 CS_DelEntries (S, I, 6);
533 /* Remember, we had changes */
543 /* Return the number of changes made */
549 unsigned OptPtrLoad6 (CodeSeg* S)
550 /* Search for the sequence:
572 unsigned Changes = 0;
574 /* Walk over the entries */
576 while (I < CS_GetEntryCount (S)) {
581 L[0] = CS_GetEntry (S, I);
583 /* Check for the sequence */
584 if (CE_IsCallTo (L[0], "pushax") &&
585 CS_GetEntries (S, L+1, I+1, 6) &&
586 L[1]->OPC == OP65_LDY &&
587 CE_IsConstImm (L[1]) &&
589 L[2]->OPC == OP65_LDX &&
590 CE_IsKnownImm (L[2], 0) &&
591 L[3]->OPC == OP65_LDA &&
592 L[3]->AM == AM65_ZP_INDY &&
593 CE_IsCallTo (L[4], "tosaddax") &&
594 L[5]->OPC == OP65_LDY &&
595 CE_IsKnownImm (L[5], 0) &&
596 CE_IsCallTo (L[6], "ldauidx") &&
597 !CS_RangeHasLabel (S, I+1, 6)) {
603 X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[0]->LI);
604 CS_InsertEntry (S, X, I+7);
607 X = NewCodeEntry (OP65_STX, AM65_ZP, "ptr1+1", 0, L[0]->LI);
608 CS_InsertEntry (S, X, I+8);
611 Arg = MakeHexArg (L[1]->Num - 2);
612 X = NewCodeEntry (OP65_LDY, AM65_IMM, Arg, 0, L[1]->LI);
613 CS_InsertEntry (S, X, I+9);
616 X = NewCodeEntry (OP65_LDA, L[3]->AM, L[3]->Arg, 0, L[3]->LI);
617 CS_InsertEntry (S, X, I+10);
620 X = NewCodeEntry (OP65_TAY, AM65_IMP, 0, 0, L[3]->LI);
621 CS_InsertEntry (S, X, I+11);
624 X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[5]->LI);
625 CS_InsertEntry (S, X, I+12);
628 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[6]->LI);
629 CS_InsertEntry (S, X, I+13);
631 /* ldy #$00 (will eventually get removed later) */
632 X = NewCodeEntry (OP65_LDY, AM65_IMM, "$00", 0, L[5]->LI);
633 CS_InsertEntry (S, X, I+14);
635 /* Remove the old code */
636 CS_DelEntries (S, I, 7);
638 /* Remember, we had changes */
648 /* Return the number of changes made */
654 unsigned OptPtrLoad7 (CodeSeg* S)
655 /* Search for the sequence:
686 unsigned Changes = 0;
689 /* Generate register info */
692 /* Walk over the entries */
694 while (I < CS_GetEntryCount (S)) {
699 L[0] = CS_GetEntry (S, I);
701 /* Check for the sequence */
702 if (L[0]->OPC == OP65_JSR &&
703 (strcmp (L[0]->Arg, "aslax1") == 0 ||
704 strcmp (L[0]->Arg, "shlax1") == 0) &&
705 CS_GetEntries (S, L+1, I+1, 9) &&
706 L[1]->OPC == OP65_CLC &&
707 L[2]->OPC == OP65_ADC &&
708 L[3]->OPC == OP65_TAY &&
709 L[4]->OPC == OP65_TXA &&
710 L[5]->OPC == OP65_ADC &&
711 L[6]->OPC == OP65_TAX &&
712 L[7]->OPC == OP65_TYA &&
713 L[8]->OPC == OP65_LDY &&
714 CE_IsCallTo (L[9], "ldaxidx") &&
715 !CS_RangeHasLabel (S, I+1, 9)) {
719 /* Track the insertion point */
720 unsigned IP = I + 10;
723 /* If X is zero on entry to aslax1, we can generate:
730 * instead of the code above. "lda tmp1" needs to be changed
731 * to "txa" in this case.
733 int ShortCode = (L[0]->RI->In.RegX == 0);
740 X = NewCodeEntry (OP65_ASL, AM65_ACC, "a", 0, L[0]->LI);
741 CS_InsertEntry (S, X, IP++);
743 /* Generate clc first, since we need the label */
744 X = NewCodeEntry (OP65_CLC, AM65_IMP, 0, 0, L[1]->LI);
745 CS_InsertEntry (S, X, IP);
748 Lab = CS_GenLabel (S, X);
751 X = NewCodeEntry (OP65_BCC, AM65_BRA, Lab->Name, Lab, L[0]->LI);
752 CS_InsertEntry (S, X, IP++);
755 X = NewCodeEntry (OP65_INX, AM65_IMP, 0, 0, L[0]->LI);
756 CS_InsertEntry (S, X, IP++);
758 /* Skip the clc insn */
764 X = NewCodeEntry (OP65_STX, AM65_ZP, "tmp1", 0, L[0]->LI);
765 CS_InsertEntry (S, X, IP++);
768 X = NewCodeEntry (OP65_ASL, AM65_ACC, "a", 0, L[0]->LI);
769 CS_InsertEntry (S, X, IP++);
772 X = NewCodeEntry (OP65_ROL, AM65_ZP, "tmp1", 0, L[0]->LI);
773 CS_InsertEntry (S, X, IP++);
776 X = NewCodeEntry (OP65_CLC, AM65_IMP, 0, 0, L[1]->LI);
777 CS_InsertEntry (S, X, IP++);
782 X = NewCodeEntry (L[2]->OPC, L[2]->AM, L[2]->Arg, 0, L[2]->LI);
783 CS_InsertEntry (S, X, IP++);
786 X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[9]->LI);
787 CS_InsertEntry (S, X, IP++);
791 X = NewCodeEntry (OP65_TXA, AM65_IMP, 0, 0, L[4]->LI);
794 X = NewCodeEntry (OP65_LDA, AM65_ZP, "tmp1", 0, L[4]->LI);
796 CS_InsertEntry (S, X, IP++);
799 X = NewCodeEntry (L[5]->OPC, L[5]->AM, L[5]->Arg, 0, L[5]->LI);
800 CS_InsertEntry (S, X, IP++);
803 X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1+1", 0, L[9]->LI);
804 CS_InsertEntry (S, X, IP++);
807 X = NewCodeEntry (L[8]->OPC, L[8]->AM, L[8]->Arg, 0, L[8]->LI);
808 CS_InsertEntry (S, X, IP++);
811 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[9]->LI);
812 CS_InsertEntry (S, X, IP++);
815 X = NewCodeEntry (OP65_TAX, AM65_IMP, 0, 0, L[9]->LI);
816 CS_InsertEntry (S, X, IP++);
819 X = NewCodeEntry (OP65_DEY, AM65_IMP, 0, 0, L[9]->LI);
820 CS_InsertEntry (S, X, IP++);
823 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[9]->LI);
824 CS_InsertEntry (S, X, IP++);
826 /* Remove the old code */
827 CS_DelEntries (S, I, 10);
829 /* Remember, we had changes */
839 /* Free the register info */
842 /* Return the number of changes made */
848 unsigned OptPtrLoad11 (CodeSeg* S)
849 /* Search for the sequence:
867 unsigned Changes = 0;
869 /* Walk over the entries */
871 while (I < CS_GetEntryCount (S)) {
876 L[0] = CS_GetEntry (S, I);
878 /* Check for the sequence */
879 if (L[0]->OPC == OP65_CLC &&
880 CS_GetEntries (S, L+1, I+1, 5) &&
881 L[1]->OPC == OP65_ADC &&
882 (L[1]->AM == AM65_ABS || L[1]->AM == AM65_ZP || L[1]->AM == AM65_IMM) &&
883 (L[2]->OPC == OP65_BCC || L[2]->OPC == OP65_JCC) &&
885 L[2]->JumpTo->Owner == L[4] &&
886 L[3]->OPC == OP65_INX &&
887 L[4]->OPC == OP65_LDY &&
888 CE_IsKnownImm (L[4], 0) &&
889 CE_IsCallTo (L[5], "ldauidx") &&
890 !CS_RangeHasLabel (S, I+1, 3) &&
891 !CE_HasLabel (L[5])) {
895 /* We will create all the new stuff behind the current one so
896 * we keep the line references.
898 X = NewCodeEntry (OP65_LDY, L[1]->AM, L[1]->Arg, 0, L[0]->LI);
899 CS_InsertEntry (S, X, I+6);
902 X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[0]->LI);
903 CS_InsertEntry (S, X, I+7);
906 X = NewCodeEntry (OP65_STX, AM65_ZP, "ptr1+1", 0, L[0]->LI);
907 CS_InsertEntry (S, X, I+8);
910 X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[0]->LI);
911 CS_InsertEntry (S, X, I+9);
913 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[0]->LI);
914 CS_InsertEntry (S, X, I+10);
916 /* Remove the old code */
917 CS_DelEntries (S, I, 6);
919 /* Remember, we had changes */
929 /* Return the number of changes made */
935 unsigned OptPtrLoad12 (CodeSeg* S)
936 /* Search for the sequence:
961 * L1: tay <- only if flags are used
963 * This function must execute before OptPtrLoad7!
967 unsigned Changes = 0;
969 /* Walk over the entries */
971 while (I < CS_GetEntryCount (S)) {
977 L[0] = CS_GetEntry (S, I);
979 /* Check for the sequence */
980 if (L[0]->OPC == OP65_LDA &&
981 L[0]->AM == AM65_ZP &&
982 strncmp (L[0]->Arg, "regbank+", 8) == 0 &&
983 (Len = strlen (L[0]->Arg)) > 0 &&
984 CS_GetEntries (S, L+1, I+1, 14) &&
985 !CS_RangeHasLabel (S, I+1, 7) &&
986 !CS_RangeHasLabel (S, I+9, 5) &&
987 L[1]->OPC == OP65_LDX &&
988 L[1]->AM == AM65_ZP &&
989 strncmp (L[1]->Arg, L[0]->Arg, Len) == 0 &&
990 strcmp (L[1]->Arg+Len, "+1") == 0 &&
991 L[2]->OPC == OP65_STA &&
992 L[2]->AM == AM65_ZP &&
993 strcmp (L[2]->Arg, "regsave") == 0 &&
994 L[3]->OPC == OP65_STX &&
995 L[3]->AM == AM65_ZP &&
996 strcmp (L[3]->Arg, "regsave+1") == 0 &&
997 L[4]->OPC == OP65_CLC &&
998 L[5]->OPC == OP65_ADC &&
999 CE_IsKnownImm (L[5], 1) &&
1000 L[6]->OPC == OP65_BCC &&
1001 L[6]->JumpTo != 0 &&
1002 L[6]->JumpTo->Owner == L[8] &&
1003 L[7]->OPC == OP65_INX &&
1004 L[8]->OPC == OP65_STA &&
1005 L[8]->AM == AM65_ZP &&
1006 strcmp (L[8]->Arg, L[0]->Arg) == 0 &&
1007 L[9]->OPC == OP65_STX &&
1008 L[9]->AM == AM65_ZP &&
1009 strcmp (L[9]->Arg, L[1]->Arg) == 0 &&
1010 L[10]->OPC == OP65_LDA &&
1011 L[10]->AM == AM65_ZP &&
1012 strcmp (L[10]->Arg, "regsave") == 0 &&
1013 L[11]->OPC == OP65_LDX &&
1014 L[11]->AM == AM65_ZP &&
1015 strcmp (L[11]->Arg, "regsave+1") == 0 &&
1016 L[12]->OPC == OP65_LDY &&
1017 CE_IsConstImm (L[12]) &&
1018 CE_IsCallTo (L[13], "ldauidx")) {
1023 /* Check if the instruction following the sequence uses the flags
1024 * set by the load. If so, insert a test of the value in the
1027 if (CE_UseLoadFlags (L[14])) {
1028 X = NewCodeEntry (OP65_TAY, AM65_IMP, 0, 0, L[13]->LI);
1029 CS_InsertEntry (S, X, I+14);
1032 /* Attach a label to L[14]. This may be either the just inserted
1033 * instruction, or the one following the sequence.
1035 Label = CS_GenLabel (S, L[14]);
1038 X = NewCodeEntry (OP65_LDY, AM65_IMM, L[12]->Arg, 0, L[12]->LI);
1039 CS_InsertEntry (S, X, I+14);
1042 X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[13]->LI);
1043 CS_InsertEntry (S, X, I+15);
1045 /* lda (regbank+n),y */
1046 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, L[0]->Arg, 0, L[13]->LI);
1047 CS_InsertEntry (S, X, I+16);
1050 X = NewCodeEntry (OP65_INC, AM65_ZP, L[0]->Arg, 0, L[5]->LI);
1051 CS_InsertEntry (S, X, I+17);
1054 X = NewCodeEntry (OP65_BNE, AM65_BRA, Label->Name, Label, L[6]->LI);
1055 CS_InsertEntry (S, X, I+18);
1057 /* inc regbank+n+1 */
1058 X = NewCodeEntry (OP65_INC, AM65_ZP, L[1]->Arg, 0, L[7]->LI);
1059 CS_InsertEntry (S, X, I+19);
1061 /* Delete the old code */
1062 CS_DelEntries (S, I, 14);
1064 /* Remember, we had changes */
1074 /* Return the number of changes made */
1080 unsigned OptPtrLoad13 (CodeSeg* S)
1081 /* Search for the sequence:
1088 * and replace it by:
1095 unsigned Changes = 0;
1097 /* Walk over the entries */
1099 while (I < CS_GetEntryCount (S)) {
1104 /* Get next entry */
1105 L[0] = CS_GetEntry (S, I);
1107 /* Check for the sequence */
1108 if (L[0]->OPC == OP65_LDA && L[0]->AM == AM65_ZP &&
1109 CS_GetEntries (S, L+1, I+1, 3) &&
1110 !CS_RangeHasLabel (S, I+1, 3) &&
1111 L[1]->OPC == OP65_LDX && L[1]->AM == AM65_ZP &&
1112 (Len = strlen (L[0]->Arg)) > 0 &&
1113 strncmp (L[0]->Arg, L[1]->Arg, Len) == 0 &&
1114 strcmp (L[1]->Arg + Len, "+1") == 0 &&
1115 L[2]->OPC == OP65_LDY &&
1116 CE_IsCallTo (L[3], "ldauidx")) {
1121 X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[3]->LI);
1122 CS_InsertEntry (S, X, I+3);
1125 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, L[0]->Arg, 0, L[3]->LI);
1126 CS_InsertEntry (S, X, I+4);
1128 /* Remove the old code */
1129 CS_DelEntry (S, I+5);
1130 CS_DelEntries (S, I, 2);
1132 /* Remember, we had changes */
1142 /* Return the number of changes made */
1148 unsigned OptPtrLoad14 (CodeSeg* S)
1149 /* Search for the sequence:
1153 * (anything that doesn't change a/x)
1157 * and replace it by:
1161 * (anything that doesn't change a/x)
1168 unsigned Changes = 0;
1171 /* Generate register info */
1174 /* Walk over the entries */
1176 while (I < CS_GetEntryCount (S)) {
1181 /* Get next entry */
1182 L[0] = CS_GetEntry (S, I);
1184 /* Check for the sequence */
1185 if (L[0]->OPC == OP65_LDA && L[0]->AM == AM65_ZP &&
1186 CS_GetEntries (S, L+1, I+1, 4) &&
1187 !CS_RangeHasLabel (S, I+1, 4) &&
1188 L[1]->OPC == OP65_LDX && L[1]->AM == AM65_ZP &&
1189 (Len = strlen (L[0]->Arg)) > 0 &&
1190 strncmp (L[0]->Arg, L[1]->Arg, Len) == 0 &&
1191 strcmp (L[1]->Arg + Len, "+1") == 0 &&
1192 (L[2]->Chg & REG_AX) == 0 &&
1193 L[3]->OPC == OP65_LDY &&
1194 CE_IsCallTo (L[4], "ldauidx")) {
1199 X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[3]->LI);
1200 CS_InsertEntry (S, X, I+5);
1203 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, L[0]->Arg, 0, L[3]->LI);
1204 CS_InsertEntry (S, X, I+6);
1206 /* Remove the old code */
1207 CS_DelEntry (S, I+4);
1209 /* Remember, we had changes */
1219 /* Free the register info */
1222 /* Return the number of changes made */
1228 unsigned OptPtrLoad15 (CodeSeg* S)
1229 /* Search for the sequence:
1236 * and replace it by:
1245 unsigned Changes = 0;
1247 /* Walk over the entries */
1249 while (I < CS_GetEntryCount (S)) {
1254 /* Get next entry */
1255 L[0] = CS_GetEntry (S, I);
1257 /* Check for the sequence */
1258 if (L[0]->OPC == OP65_LDA && L[0]->AM == AM65_ZP &&
1259 CS_GetEntries (S, L+1, I+1, 3) &&
1260 !CS_RangeHasLabel (S, I+1, 3) &&
1261 L[1]->OPC == OP65_LDX && L[1]->AM == AM65_ZP &&
1262 (Len = strlen (L[0]->Arg)) > 0 &&
1263 strncmp (L[0]->Arg, L[1]->Arg, Len) == 0 &&
1264 strcmp (L[1]->Arg + Len, "+1") == 0 &&
1265 L[2]->OPC == OP65_LDY &&
1266 CE_IsCallTo (L[3], "ldaxidx")) {
1271 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, L[0]->Arg, 0, L[3]->LI);
1272 CS_InsertEntry (S, X, I+4);
1275 X = NewCodeEntry (OP65_TAX, AM65_IMP, 0, 0, L[3]->LI);
1276 CS_InsertEntry (S, X, I+5);
1279 X = NewCodeEntry (OP65_DEY, AM65_IMP, 0, 0, L[3]->LI);
1280 CS_InsertEntry (S, X, I+6);
1283 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, L[0]->Arg, 0, L[3]->LI);
1284 CS_InsertEntry (S, X, I+7);
1286 /* Remove the old code */
1287 CS_DelEntry (S, I+3);
1288 CS_DelEntries (S, I, 2);
1290 /* Remember, we had changes */
1300 /* Return the number of changes made */
1306 unsigned OptPtrLoad16 (CodeSeg* S)
1307 /* Search for the sequence
1312 * and replace it by:
1320 * This step must be executed *after* OptPtrLoad1!
1323 unsigned Changes = 0;
1325 /* Walk over the entries */
1327 while (I < CS_GetEntryCount (S)) {
1331 /* Get next entry */
1332 L[0] = CS_GetEntry (S, I);
1334 /* Check for the sequence */
1335 if (L[0]->OPC == OP65_LDY &&
1336 CS_GetEntries (S, L+1, I+1, 1) &&
1337 CE_IsCallTo (L[1], "ldauidx") &&
1338 !CE_HasLabel (L[1])) {
1342 /* Store the high byte */
1343 X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[0]->LI);
1344 CS_InsertEntry (S, X, I);
1346 /* Store the low byte */
1347 X = NewCodeEntry (OP65_STX, AM65_ZP, "ptr1+1", 0, L[0]->LI);
1348 CS_InsertEntry (S, X, I+1);
1350 /* Delete the call to ldauidx */
1351 CS_DelEntry (S, I+3);
1353 /* Load the high and low byte */
1354 X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[0]->LI);
1355 CS_InsertEntry (S, X, I+3);
1356 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[0]->LI);
1357 CS_InsertEntry (S, X, I+4);
1359 /* Remember, we had changes */
1369 /* Return the number of changes made */
1375 unsigned OptPtrLoad17 (CodeSeg* S)
1376 /* Search for the sequence
1381 * and replace it by:
1391 * This step must be executed *after* OptPtrLoad9! While code size increases
1392 * by more than 200%, inlining will greatly improve visibility for the
1393 * optimizer, so often part of the code gets improved later. So we will mark
1394 * the step with less than 200% so it gets executed when -Oi is in effect.
1397 unsigned Changes = 0;
1399 /* Walk over the entries */
1401 while (I < CS_GetEntryCount (S)) {
1405 /* Get next entry */
1406 L[0] = CS_GetEntry (S, I);
1408 /* Check for the sequence */
1409 if (L[0]->OPC == OP65_LDY &&
1410 CS_GetEntries (S, L+1, I+1, 1) &&
1411 CE_IsCallTo (L[1], "ldaxidx") &&
1412 !CE_HasLabel (L[1])) {
1416 /* Store the high byte */
1417 X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[0]->LI);
1418 CS_InsertEntry (S, X, I+2);
1420 /* Store the low byte */
1421 X = NewCodeEntry (OP65_STX, AM65_ZP, "ptr1+1", 0, L[0]->LI);
1422 CS_InsertEntry (S, X, I+3);
1425 X = NewCodeEntry (L[0]->OPC, L[0]->AM, L[0]->Arg, 0, L[0]->LI);
1426 CS_InsertEntry (S, X, I+4);
1429 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[1]->LI);
1430 CS_InsertEntry (S, X, I+5);
1433 X = NewCodeEntry (OP65_TAX, AM65_IMP, 0, 0, L[1]->LI);
1434 CS_InsertEntry (S, X, I+6);
1437 X = NewCodeEntry (OP65_DEY, AM65_IMP, 0, 0, L[1]->LI);
1438 CS_InsertEntry (S, X, I+7);
1441 X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[1]->LI);
1442 CS_InsertEntry (S, X, I+8);
1444 /* Delete original sequence */
1445 CS_DelEntries (S, I, 2);
1447 /* Remember, we had changes */
1457 /* Return the number of changes made */