1 /*-------------------------------------------------------------------------
3 pcode.h - post code generation
4 Written By - Scott Dattalo scott@dattalo.com
5 Ported to PIC16 By - Martin Dubuc m.dubuc@rogers.com
7 This program is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 2, or (at your option) any
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 -------------------------------------------------------------------------*/
29 The post code generation is an assembler optimizer. The assembly code
30 produced by all of the previous steps is fully functional. This step
31 will attempt to analyze the flow of the assembly code and agressively
32 optimize it. The peep hole optimizer attempts to do the same thing.
33 As you may recall, the peep hole optimizer replaces blocks of assembly
34 with more optimal blocks (e.g. removing redundant register loads).
35 However, the peep hole optimizer has to be somewhat conservative since
36 an assembly program has implicit state information that's unavailable
37 when only a few instructions are examined.
38 Consider this example:
44 The movf seems redundant since we know that the W register already
45 contains the same value of t1. So a peep hole optimizer is tempted to
46 remove the "movf". However, this is dangerous since the movf affects
47 the flags in the status register (specifically the Z flag) and subsequent
48 code may depend upon this. Look at these two examples:
52 movf t1,w ; Can't remove this movf
58 movf t1,w ; This movf can be removed
59 xorwf t2,w ; since xorwf will over write Z
69 /***********************************************************************
72 * The DFPRINTF macro will call fprintf if PCODE_DEBUG is defined.
73 * The macro is used like:
75 * DPRINTF(("%s #%d\n","test", 1));
77 * The double parenthesis (()) are necessary
79 ***********************************************************************/
83 #define DFPRINTF(args) (fprintf args)
85 #define DFPRINTF(args) ;
89 /***********************************************************************
90 * PIC status bits - this will move into device dependent headers
91 ***********************************************************************/
97 #define PIC_IRP_BIT 7 /* Indirect register page select */
99 /***********************************************************************
100 * PIC INTCON bits - this will move into device dependent headers
101 ***********************************************************************/
102 #define PIC_RBIF_BIT 0 /* Port B level has changed flag */
103 #define PIC_INTF_BIT 1 /* Port B bit 0 interrupt on edge flag */
104 #define PIC_T0IF_BIT 2 /* TMR0 has overflowed flag */
105 #define PIC_RBIE_BIT 3 /* Port B level has changed - Interrupt Enable */
106 #define PIC_INTE_BIT 4 /* Port B bit 0 interrupt on edge - Int Enable */
107 #define PIC_T0IE_BIT 5 /* TMR0 overflow Interrupt Enable */
108 #define PIC_PIE_BIT 6 /* Peripheral Interrupt Enable */
109 #define PIC_GIE_BIT 7 /* Global Interrupt Enable */
111 /***********************************************************************
112 * PIC bank definitions
113 ***********************************************************************/
114 #define PIC_BANK_FIRST 0
115 #define PIC_BANK_LAST 0xf
118 /***********************************************************************
120 ***********************************************************************/
126 /***********************************************************************
128 * PIC_OPTYPE - Operand types that are specific to the PIC architecture
130 * If a PIC assembly instruction has an operand then here is where we
131 * associate a type to it. For example,
135 * The movf has two operands: 'reg' and the W register. 'reg' is some
136 * arbitrary general purpose register, hence it has the type PO_GPR_REGISTER.
137 * The W register, which is the PIC's accumulator, has the type PO_W.
139 ***********************************************************************/
145 PO_NONE=0, // No operand e.g. NOP
146 PO_W, // The working register (as a destination)
147 PO_WREG, // The working register (as a file register)
148 PO_STATUS, // The 'STATUS' register
149 PO_BSR, // The 'BSR' register
150 PO_FSR0, // The "file select register" (in PIC18 family it's one
152 PO_INDF0, // The Indirect register
153 PO_INTCON, // Interrupt Control register
154 PO_GPR_REGISTER, // A general purpose register
155 PO_GPR_BIT, // A bit of a general purpose register
156 PO_GPR_TEMP, // A general purpose temporary register
157 PO_SFR_REGISTER, // A special function register (e.g. PORTA)
158 PO_PCL, // Program counter Low register
159 PO_PCLATH, // Program counter Latch high register
160 PO_PCLATU, // Program counter Latch upper register
161 PO_PRODL, // Product Register Low
162 PO_PRODH, // Product Register High
163 PO_LITERAL, // A constant
164 PO_REL_ADDR, // A relative address
165 PO_IMMEDIATE, // (8051 legacy)
166 PO_DIR, // Direct memory (8051 legacy)
167 PO_CRY, // bit memory (8051 legacy)
168 PO_BIT, // bit operand.
169 PO_STR, // (8051 legacy)
171 PO_WILD // Wild card operand in peep optimizer
175 /***********************************************************************
179 * This is not a list of the PIC's opcodes per se, but instead
180 * an enumeration of all of the different types of pic opcodes.
182 ***********************************************************************/
186 POC_WILD=-1, /* Wild card - used in the pCode peep hole optimizer
187 * to represent ANY pic opcode */
270 // POC_TRIS , // To be removed
278 /***********************************************************************
279 * PC_TYPE - pCode Types
280 ***********************************************************************/
284 PC_COMMENT=0, /* pCode is a comment */
285 PC_INLINE, /* user's inline code */
286 PC_OPCODE, /* PORT dependent opcode */
287 PC_LABEL, /* assembly label */
288 PC_FLOW, /* flow analysis */
289 PC_FUNCTION, /* Function start or end */
290 PC_WILD, /* wildcard - an opcode place holder used
291 * in the pCode peep hole optimizer */
292 PC_CSOURCE, /* C-Source Line */
293 PC_ASMDIR, /* Assembler directive */
294 PC_BAD /* Mark the pCode object as being bad */
297 /************************************************/
298 /*************** Structures ********************/
299 /************************************************/
300 /* These are here as forward references - the
301 * full definition of these are below */
303 struct pCodeWildBlock;
304 struct pCodeRegLives;
306 /*************************************************
309 The first step in optimizing pCode is determining
310 the program flow. This information is stored in
311 single-linked lists in the for of 'from' and 'to'
312 objects with in a pcode. For example, most instructions
313 don't involve any branching. So their from branch
314 points to the pCode immediately preceding them and
315 their 'to' branch points to the pcode immediately
316 following them. A skip instruction is an example of
317 a pcode that has multiple (in this case two) elements
318 in the 'to' branch. A 'label' pcode is an where there
319 may be multiple 'from' branches.
320 *************************************************/
322 typedef struct pBranch
324 struct pCode *pc; // Next pCode in a branch
325 struct pBranch *next; /* If more than one branch
326 * the next one is here */
330 /*************************************************
333 pCode Operand structure.
334 For those assembly instructions that have arguments,
335 the pCode will have a pCodeOp in which the argument
336 can be stored. For example
340 'some_register' will be stored/referenced in a pCodeOp
342 *************************************************/
344 typedef struct pCodeOp
352 typedef struct pCodeOpBit
356 unsigned int inBitSpace: 1; /* True if in bit space, else
357 just a bit of a register */
360 typedef struct pCodeOpLit
366 typedef struct pCodeOpLit2
374 typedef struct pCodeOpImmd
377 int offset; /* low,high or upper byte of immediate value */
378 int index; /* add this to the immediate value */
379 unsigned _const:1; /* is in code space */
381 int rIdx; /* If this immd points to a register */
382 struct regs *r; /* then this is the reg. */
386 typedef struct pCodeOpLabel
392 typedef struct pCodeOpReg
394 pCodeOp pcop; // Can be either GPR or SFR
395 int rIdx; // Index into the register table
397 int instance; // byte # of Multi-byte registers
401 typedef struct pCodeOpReg2
403 pCodeOp pcop; // used by default to all references
406 int instance; // assume same instance for both operands
409 pCodeOp *pcop2; // second memory operand
412 typedef struct pCodeOpRegBit
414 pCodeOpReg pcor; // The Register containing this bit
415 int bit; // 0-7 bit number.
416 PIC_OPTYPE subtype; // The type of this register.
417 unsigned int inBitSpace: 1; /* True if in bit space, else
418 just a bit of a register */
422 typedef struct pCodeOpWild
426 struct pCodeWildBlock *pcwb;
428 int id; /* index into an array of char *'s that will match
429 * the wild card. The array is in *pcp. */
430 pCodeOp *subtype; /* Pointer to the Operand type into which this wild
431 * card will be expanded */
432 pCodeOp *matched; /* When a wild matches, we'll store a pointer to the
433 * opcode we matched */
438 /*************************************************
441 Here is the basic build block of a PIC instruction.
442 Each pic instruction will get allocated a pCode.
443 A linked list of pCodes makes a program.
445 **************************************************/
451 struct pCode *prev; // The pCode objects are linked together
452 struct pCode *next; // in doubly linked lists.
454 int seq; // sequence number
456 struct pBlock *pb; // The pBlock that contains this pCode.
458 /* "virtual functions"
459 * The pCode structure is like a base class
460 * in C++. The subsequent structures that "inherit"
461 * the pCode structure will initialize these function
462 * pointers to something useful */
463 // void (*analyze) (struct pCode *_this);
464 void (*destruct)(struct pCode *_this);
465 void (*print) (FILE *of,struct pCode *_this);
470 /*************************************************
472 **************************************************/
474 typedef struct pCodeComment
484 /*************************************************
486 **************************************************/
488 typedef struct pCodeCSource
500 /*************************************************
502 **************************************************/
504 typedef struct pCodeAsmDir
515 /*************************************************
518 The Flow object is used as marker to separate
519 the assembly code into contiguous chunks. In other
520 words, everytime an instruction cause or potentially
521 causes a branch, a Flow object will be inserted into
522 the pCode chain to mark the beginning of the next
525 **************************************************/
527 typedef struct pCodeFlow
532 pCode *end; /* Last pCode in this flow. Note that
533 the first pCode is pc.next */
535 /* set **uses; * map the pCode instruction inCond and outCond conditions
536 * in this array of set's. The reason we allocate an
537 * array of pointers instead of declaring each type of
538 * usage is because there are port dependent usage definitions */
539 //int nuses; /* number of uses sets */
541 set *from; /* flow blocks that can send control to this flow block */
542 set *to; /* flow blocks to which this one can send control */
543 struct pCodeFlow *ancestor; /* The most immediate "single" pCodeFlow object that
544 * executes prior to this one. In many cases, this
545 * will be just the previous */
547 int inCond; /* Input conditions - stuff assumed defined at entry */
548 int outCond; /* Output conditions - stuff modified by flow block */
550 int firstBank; /* The first and last bank flags are the first and last */
551 int lastBank; /* register banks used within one flow object */
556 set *registers;/* Registers used in this flow */
560 /*************************************************
563 The Flow Link object is used to record information
564 about how consecutive excutive Flow objects are related.
565 The pCodeFlow objects demarcate the pCodeInstructions
566 into contiguous chunks. The FlowLink records conflicts
567 in the discontinuities. For example, if one Flow object
568 references a register in bank 0 and the next Flow object
569 references a register in bank 1, then there is a discontinuity
570 in the banking registers.
573 typedef struct pCodeFlowLink
575 pCodeFlow *pcflow; /* pointer to linked pCodeFlow object */
577 int bank_conflict; /* records bank conflicts */
581 /*************************************************
584 Here we describe all the facets of a PIC instruction
585 (expansion for the 18cxxx is also provided).
587 **************************************************/
589 typedef struct pCodeInstruction
594 PIC_OPCODE op; // The opcode of the instruction.
596 char const * const mnemonic; // Pointer to mnemonic string
598 pBranch *from; // pCodes that execute before this one
599 pBranch *to; // pCodes that execute after
600 pBranch *label; // pCode instructions that have labels
602 pCodeOp *pcop; /* Operand, if this instruction has one */
603 pCodeFlow *pcflow; /* flow block to which this instruction belongs */
604 pCodeCSource *cline; /* C Source from which this instruction was derived */
606 unsigned int num_ops; /* Number of operands (0,1,2 for mid range pics) */
607 unsigned int isModReg: 1; /* If destination is W or F, then 1==F */
608 unsigned int isBitInst: 1; /* e.g. BCF */
609 unsigned int isBranch: 1; /* True if this is a branching instruction */
610 unsigned int isSkip: 1; /* True if this is a skip instruction */
611 unsigned int isLit: 1; /* True if this instruction has an literal operand */
612 unsigned int isAccess: 1; /* True if this instruction has an access RAM operand */
613 unsigned int isFastCall: 1; /* True if this instruction has a fast call/return mode select operand */
614 unsigned int is2MemOp: 1; /* True is second operand is a memory operand VR - support for MOVFF */
615 unsigned int is2LitOp: 1; /* True if instruction takes 2 literal operands VR - support for LFSR */
617 PIC_OPCODE inverted_op; /* Opcode of instruction that's the opposite of this one */
618 unsigned int inCond; // Input conditions for this instruction
619 unsigned int outCond; // Output conditions for this instruction
621 #define PCI_MAGIC 0x6e12
622 unsigned int pci_magic; // sanity check for pci initialization
626 /*************************************************
628 **************************************************/
630 typedef struct pCodeLabel
640 /*************************************************
642 **************************************************/
644 typedef struct pCodeFunction
650 char *fname; /* If NULL, then this is the end of
651 a function. Otherwise, it's the
652 start and the name is contained
655 pBranch *from; // pCodes that execute before this one
656 pBranch *to; // pCodes that execute after
657 pBranch *label; // pCode instructions that have labels
659 int ncalled; /* Number of times function is called */
664 /*************************************************
666 **************************************************/
668 typedef struct pCodeWild
671 pCodeInstruction pci;
673 int id; /* Index into the wild card array of a peepBlock
674 * - this wild card will get expanded into that pCode
675 * that is stored at this index */
677 /* Conditions on wild pcode instruction */
678 int mustBeBitSkipInst:1;
679 int mustNotBeBitSkipInst:1;
680 int invertBitSkipInst:1;
682 pCodeOp *operand; // Optional operand
683 pCodeOp *label; // Optional label
687 /*************************************************
690 Here are PIC program snippets. There's a strong
691 correlation between the eBBlocks and pBlocks.
692 SDCC subdivides a C program into managable chunks.
693 Each chunk becomes a eBBlock and ultimately in the
696 **************************************************/
698 typedef struct pBlock
700 memmap *cmemmap; /* The snippet is from this memmap */
701 char dbName; /* if cmemmap is NULL, then dbName will identify the block */
702 pCode *pcHead; /* A pointer to the first pCode in a link list of pCodes */
703 pCode *pcTail; /* A pointer to the last pCode in a link list of pCodes */
705 struct pBlock *next; /* The pBlocks will form a doubly linked list */
708 set *function_entries; /* dll of functions in this pblock */
714 unsigned visited:1; /* set true if traversed in call tree */
716 unsigned seq; /* sequence number of this pBlock */
720 /*************************************************
723 The collection of pBlock program snippets are
724 placed into a linked list that is implemented
725 in the pFile structure.
727 The pcode optimizer will parse the pFile.
729 **************************************************/
733 pBlock *pbHead; /* A pointer to the first pBlock */
734 pBlock *pbTail; /* A pointer to the last pBlock */
736 pBranch *functions; /* A SLL of functions in this pFile */
742 /*************************************************
745 The pCodeWildBlock object keeps track of the wild
746 variables, operands, and opcodes that exist in
748 **************************************************/
749 typedef struct pCodeWildBlock {
751 struct pCodePeep *pcp; // pointer back to ... I don't like this...
753 int nvars; // Number of wildcard registers in target.
754 char **vars; // array of pointers to them
756 int nops; // Number of wildcard operands in target.
757 pCodeOp **wildpCodeOps; // array of pointers to the pCodeOp's.
759 int nwildpCodes; // Number of wildcard pCodes in target/replace
760 pCode **wildpCodes; // array of pointers to the pCode's.
764 /*************************************************
767 The pCodePeep object mimics the peep hole optimizer
768 in the main SDCC src (e.g. SDCCpeeph.c). Essentially
769 there is a target pCode chain and a replacement
770 pCode chain. The target chain is compared to the
771 pCode that is generated by gen.c. If a match is
772 found then the pCode is replaced by the replacement
774 **************************************************/
775 typedef struct pCodePeep {
776 pCodeWildBlock target; // code we'd like to optimize
777 pCodeWildBlock replace; // and this is what we'll optimize it with.
780 //pBlock replace; // and this is what we'll optimize it with.
784 /* (Note: a wildcard register is a place holder. Any register
785 * can be replaced by the wildcard when the pcode is being
786 * compared to the target. */
788 /* Post Conditions. A post condition is a condition that
789 * must be either true or false before the peep rule is
790 * accepted. For example, a certain rule may be accepted
791 * if and only if the Z-bit is not used as an input to
792 * the subsequent instructions in a pCode chain.
794 unsigned int postFalseCond;
795 unsigned int postTrueCond;
799 /*************************************************
801 pCode peep command definitions
803 Here are some special commands that control the
804 way the peep hole optimizer behaves
806 **************************************************/
808 enum peepCommandTypes{
815 /*************************************************
816 peepCommand structure stores the peep commands.
818 **************************************************/
820 typedef struct peepCommand {
825 /*************************************************
828 **************************************************/
829 #define PCODE(x) ((pCode *)(x))
830 #define PCI(x) ((pCodeInstruction *)(x))
831 #define PCL(x) ((pCodeLabel *)(x))
832 #define PCF(x) ((pCodeFunction *)(x))
833 #define PCFL(x) ((pCodeFlow *)(x))
834 #define PCFLINK(x)((pCodeFlowLink *)(x))
835 #define PCW(x) ((pCodeWild *)(x))
836 #define PCCS(x) ((pCodeCSource *)(x))
837 #define PCAD(x) ((pCodeAsmDir *)(x))
839 #define PCOP(x) ((pCodeOp *)(x))
840 //#define PCOB(x) ((pCodeOpBit *)(x))
841 #define PCOL(x) ((pCodeOpLit *)(x))
842 #define PCOI(x) ((pCodeOpImmd *)(x))
843 #define PCOLAB(x) ((pCodeOpLabel *)(x))
844 #define PCOR(x) ((pCodeOpReg *)(x))
845 #define PCOR2(x) ((pCodeOpReg2 *)(x))
846 #define PCORB(x) ((pCodeOpRegBit *)(x))
847 #define PCOW(x) ((pCodeOpWild *)(x))
849 #define PBR(x) ((pBranch *)(x))
851 #define PCWB(x) ((pCodeWildBlock *)(x))
855 macros for checking pCode types
857 #define isPCI(x) ((PCODE(x)->type == PC_OPCODE))
858 #define isPCI_BRANCH(x) ((PCODE(x)->type == PC_OPCODE) && PCI(x)->isBranch)
859 #define isPCI_SKIP(x) ((PCODE(x)->type == PC_OPCODE) && PCI(x)->isSkip)
860 #define isPCI_LIT(x) ((PCODE(x)->type == PC_OPCODE) && PCI(x)->isLit)
861 #define isPCI_BITSKIP(x)((PCODE(x)->type == PC_OPCODE) && PCI(x)->isSkip && PCI(x)->isBitInst)
862 #define isPCFL(x) ((PCODE(x)->type == PC_FLOW))
863 #define isPCF(x) ((PCODE(x)->type == PC_FUNCTION))
864 #define isPCL(x) ((PCODE(x)->type == PC_LABEL))
865 #define isPCW(x) ((PCODE(x)->type == PC_WILD))
866 #define isPCCS(x) ((PCODE(x)->type == PC_CSOURCE))
867 #define isASMDIR(x) ((PCODE(x)->type == PC_ASMDIR))
869 #define isCALL(x) ((isPCI(x)) && (PCI(x)->op == POC_CALL))
870 #define isSTATUS_REG(r) ((r)->pc_type == PO_STATUS)
871 #define isBSR_REG(r) ((r)->pc_type == PO_BSR)
872 #define isACCESS_BANK(r) (r->accessBank)
876 #define isPCOLAB(x) ((PCOP(x)->type) == PO_LABEL)
878 /*-----------------------------------------------------------------*
880 *-----------------------------------------------------------------*/
882 pCode *pic16_newpCode (PIC_OPCODE op, pCodeOp *pcop); // Create a new pCode given an operand
883 pCode *pic16_newpCodeCharP(char *cP); // Create a new pCode given a char *
884 pCode *pic16_newpCodeInlineP(char *cP); // Create a new pCode given a char *
885 pCode *pic16_newpCodeFunction(char *g, char *f); // Create a new function
886 pCode *pic16_newpCodeLabel(char *name,int key); // Create a new label given a key
887 pCode *pic16_newpCodeCSource(int ln, char *f, char *l); // Create a new symbol line
888 pBlock *pic16_newpCodeChain(memmap *cm,char c, pCode *pc); // Create a new pBlock
889 void pic16_printpBlock(FILE *of, pBlock *pb); // Write a pBlock to a file
890 void pic16_addpCode2pBlock(pBlock *pb, pCode *pc); // Add a pCode to a pBlock
891 void pic16_addpBlock(pBlock *pb); // Add a pBlock to a pFile
892 void pic16_copypCode(FILE *of, char dbName); // Write all pBlocks with dbName to *of
893 void pic16_movepBlock2Head(char dbName); // move pBlocks around
894 void pic16_AnalyzepCode(char dbName);
895 void pic16_AssignRegBanks(void);
896 void pic16_printCallTree(FILE *of);
897 void pCodePeepInit(void);
898 void pic16_pBlockConvert2ISR(pBlock *pb);
899 void pic16_pBlockConvert2Absolute(pBlock *pb);
901 pCodeOp *pic16_newpCodeOpLabel(char *name, int key);
902 pCodeOp *pic16_newpCodeOpImmd(char *name, int offset, int index, int code_space);
903 pCodeOp *pic16_newpCodeOpLit(int lit);
904 pCodeOp *pic16_newpCodeOpLit2(int lit, pCodeOp *arg2);
905 pCodeOp *pic16_newpCodeOpBit(char *name, int bit,int inBitSpace);
906 pCodeOp *pic16_newpCodeOpRegFromStr(char *name);
907 pCodeOp *pic16_newpCodeOp(char *name, PIC_OPTYPE p);
908 pCodeOp *pic16_pCodeOpCopy(pCodeOp *pcop);
910 pCode * pic16_findNextInstruction(pCode *pci);
911 pCode * pic16_findNextpCode(pCode *pc, PC_TYPE pct);
912 int pic16_isPCinFlow(pCode *pc, pCode *pcflow);
913 struct regs * pic16_getRegFromInstruction(pCode *pc);
914 struct regs * pic16_getRegFromInstruction2(pCode *pc);
916 extern void pic16_pcode_test(void);
917 extern int pic16_debug_verbose;
918 /*-----------------------------------------------------------------*
920 *-----------------------------------------------------------------*/
922 extern pCodeOpReg pic16_pc_status;
923 extern pCodeOpReg pic16_pc_intcon;
924 extern pCodeOpReg pic16_pc_pcl;
925 extern pCodeOpReg pic16_pc_pclath;
926 extern pCodeOpReg pic16_pc_wreg;
927 extern pCodeOpReg pic16_pc_bsr;
928 extern pCodeOpReg pic16_pc_fsr0;
929 extern pCodeOpReg pic16_pc_fsr0l;
930 extern pCodeOpReg pic16_pc_fsr0h;
931 extern pCodeOpReg pic16_pc_fsr1l;
932 extern pCodeOpReg pic16_pc_fsr1h;
933 extern pCodeOpReg pic16_pc_fsr2l;
934 extern pCodeOpReg pic16_pc_fsr2h;
935 extern pCodeOpReg pic16_pc_indf0;
936 extern pCodeOpReg pic16_pc_postinc0;
937 extern pCodeOpReg pic16_pc_postdec0;
938 extern pCodeOpReg pic16_pc_preinc0;
939 extern pCodeOpReg pic16_pc_plusw0;
940 extern pCodeOpReg pic16_pc_indf1;
941 extern pCodeOpReg pic16_pc_postinc1;
942 extern pCodeOpReg pic16_pc_postdec1;
943 extern pCodeOpReg pic16_pc_preinc1;
944 extern pCodeOpReg pic16_pc_plusw1;
945 extern pCodeOpReg pic16_pc_indf2;
946 extern pCodeOpReg pic16_pc_postinc2;
947 extern pCodeOpReg pic16_pc_postdec2;
948 extern pCodeOpReg pic16_pc_preinc2;
949 extern pCodeOpReg pic16_pc_plusw2;
950 extern pCodeOpReg pic16_pc_prodl;
951 extern pCodeOpReg pic16_pc_prodh;
953 extern pCodeOpReg pic16_pc_kzero;
954 extern pCodeOpReg pic16_pc_wsave; /* wsave and ssave are used to save W and the Status */
955 extern pCodeOpReg pic16_pc_ssave; /* registers during an interrupt */
958 #endif // __PCODE_H__