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/* cuc.h -- OpenRISC Custom Unit Compiler, main header file
 *    Copyright (C) 2002 Marko Mlinar, markom@opencores.org
 *
 *    This file is part of OpenRISC 1000 Architectural Simulator.
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
 
#ifndef __DATAF_H__
#define __DATAF_H__
 
/* Maximum number of instructions per function */
#define MAX_INSNS	0x10000
#define MAX_OPERANDS	4
#define MAX_BB          0x1000
#define MAX_REGS	34
#define FLAG_REG	(MAX_REGS - 2)
#define LRBB_REG	(MAX_REGS - 1)
#define MAX_STACK       0x1000 /* if more, not converted */
#define MAX_PREROLL     32
#define MAX_UNROLL      32
 
#define IT_BRANCH	0x0001  /* Branch instruction */
#define IT_INDELAY	0x0002  /* Instruction is in delay slot */
#define	IT_BBSTART	0x0004  /* BB start marker */
#define	IT_BBEND  	0x0008  /* BB end marker */
#define IT_OUTPUT	0x0010  /* this instruction holds final value of the register */
#define IT_SIGNED	0x0020  /* Instruction is signed */
#define IT_MEMORY	0x0040  /* Instruction does memory access */
#define IT_UNUSED       0x0080  /* dead instruction marker */
#define IT_FLAG1        0x0100  /* misc flags */
#define IT_FLAG2        0x0200
#define IT_VOLATILE     0x0400  /* Should not be moved/removed */
#define IT_MEMADD       0x0800  /* add before the load -- should not be removed */
#define IT_COND         0x1000  /* Conditional */
#define IT_LATCHED      0x2000  /* Output of this instruction is latched/registered */
#define IT_CUT          0x4000  /* After this instruction register is placed */
 
#define OPT_NONE	0x00
#define	OPT_CONST	0x01
#define OPT_REGISTER	0x02
#define OPT_REF		0x04
#define OPT_JUMP	0x08    /* Jump to an instruction index */
#define OPT_DEST	0x10    /* This operand is dest */
#define OPT_BB          0x20    /* Jumpt to BB */
#define OPT_LRBB        0x40    /* 0 if we came in from left BB, or 1 otherwise */
 
#define MT_WIDTH        0x007   /* These bits hold memory access width in bytes */
#define MT_BURST        0x008   /* burst start & end markers */
#define MT_BURSTE       0x010
#define MT_CALL         0x020   /* This is a call */
#define MT_LOAD         0x040   /* This memory access does a read */
#define MT_STORE        0x080   /* This memory access does a write */
#define MT_SIGNED       0x100   /* Signed memory access */
 
#define MO_NONE         0       /* different memory ordering, even if there are dependencies,
                                   burst can be made, width can change */
#define MO_WEAK         1       /* different memory ordering, if there cannot be dependencies,
                                   burst can be made, width can change */
#define MO_STRONG       2       /* Same memory ordering, burst can be made, width can change */
#define MO_EXACT        3       /* Exacltly the same memory ordering and widths */
 
#define BB_INLOOP       0x01    /* This block is inside a loop */
#define BB_OPTIONAL     0x02
#define BB_DEAD         0x08    /* This block is unaccessible -> to be removed */
 
#define BBID_START      MAX_BB        /* Start BB pointer */
#define BBID_END        (MAX_BB + 1)  /* End BB pointer */
 
/* Various macros to minimize code size */
#define REF(bb,i)       (((bb) * MAX_INSNS) + (i))
#define REF_BB(r)       ((r) / MAX_INSNS)
#define REF_I(r)        ((r) % MAX_INSNS)
#define INSN(ref)       bb[REF_BB(ref)].insn[REF_I(ref)]
 
#ifndef MIN
# define MIN(x,y)          ((x) < (y) ? (x) : (y))
#endif
 
#ifndef MAX
# define MAX(x,y)          ((x) > (y) ? (x) : (y))
#endif
 
#define log(x...)       {fprintf (flog, x); fflush (flog); }
 
#define cucdebug(x,s...) {if ((x) <= cuc_debug) PRINTF (s);}
 
#define CUC_WIDTH_ITERATIONS  256
 
/* Options */
/* Whether we are debugging cuc (0-9) */
extern int cuc_debug;
 
/* Temporary registers by software convention */
extern const int caller_saved[MAX_REGS];
 
typedef struct _dep_list_t {
	unsigned long ref;
 	struct _dep_list_t *next;
} dep_list;
 
/* Shared list, if marked dead, entry is not used */
typedef struct _csm_list {
  int ref;
  int cnt;
  int cmovs;
  double size, osize;
  int cmatch;
  int dead;
  int ninsn;                /* Number of associated instructions */
  struct _csm_list *from;
  struct _csm_list *next;
} cuc_shared_list;
 
/* Shared resource item definition */
typedef struct {
  int ref;
  int cmatch;
} cuc_shared_item;
 
/* Implementation specific timings */
typedef struct {
        int b;                    /* Basic block # this timing is referring to */
        int preroll;              /* How many times was this BB pre/unrolled */
        int unroll;
        int nshared;
        cuc_shared_item *shared;  /* List of shared resources */
        int new_time;
        double size;
} cuc_timings;
 
/* Instructionn entity */
typedef struct {
	int type;           /* type of the instruction */
	int index;          /* Instruction index */
	int opt[MAX_OPERANDS];          /* operand types */
	unsigned long op[MAX_OPERANDS]; /* operand values */
	dep_list *dep;      /* instruction dependencies */
	unsigned long insn; /* Instruction opcode */
	char disasm[40];    /* disassembled string */
        unsigned long max;  /* max result value */
        int tmp;
} cuc_insn;
 
/* Basic block entity */
typedef struct {
        unsigned long type; /* Type of the bb */
        int first, last;    /* Where this block lies */
        int prev[2], next[2];
        int tmp;
        cuc_insn *insn;      /* Instructions lie here */
        int ninsn;          /* Number of instructions */
        int last_used_reg[MAX_REGS];
        dep_list *mdep;          /* Last memory access dependencies */
        int nmemory;
        int cnt;            /* how many times was this block executed */
        int unrolled;       /* how many times has been this block unrolled */
 
        int ntim;           /* Basic block options */
        cuc_timings *tim;
        int selected_tim;   /* Selected option, -1 if none */
} cuc_bb;
 
/* Function entity */
typedef struct _cuc_func {
        /* Basic blocks */
        int num_bb;
        cuc_bb bb[MAX_BB];
        int saved_regs[MAX_REGS];/* Whether this register was saved */
        int lur[MAX_REGS];       /* Location of last use */
        int used_regs[MAX_REGS]; /* Nonzero if it was used */
 
        /* Schedule of memory instructions */
        int nmsched;
        int msched[MAX_INSNS];
        int mtype[MAX_INSNS];
 
        /* initial bb and their relocations to new block numbers */
        int num_init_bb;
        int *init_bb_reloc;
        int orig_time;            /* time in cyc required for SW implementation */
        int num_runs;             /* Number times this function was run */
        cuc_timings timings;      /* Base timings */
        unsigned long start_addr; /* Address of first instruction inn function */
        unsigned long end_addr;   /* Address of last instruction inn function */
        int memory_order;         /* Memory order */
 
        int nfdeps;               /* Function dependencies */
        struct _cuc_func **fdeps;
 
        int tmp;
} cuc_func;
 
/* Instructions from function */
extern cuc_insn insn[MAX_INSNS];
extern int num_insn;
extern int reloc[MAX_INSNS];
extern FILE *flog;
 
/* returns log2(x) */
int log2 (unsigned long x);
 
/* Loads from file into global array insn */
int cuc_load (char *in_fn);
 
/* Negates conditional instruction */
void negate_conditional (cuc_insn *ii);
 
/* Scans sequence of BBs and set bb[].cnt */
void generate_bb_seq (cuc_func *f, char *mp_filename, char *bb_filename);
 
/* Prints out instructions */
void print_insns (int bb, cuc_insn *insn, int size, int verbose);
 
/* prints out bb string */
void print_bb_num (int num);
 
/* Print out basic blocks */
void print_cuc_bb (cuc_func *func, char *s);
 
/* Duplicates function */
cuc_func *dup_func (cuc_func *f);
 
/* Releases memory allocated by function */
void free_func (cuc_func *f);
 
/* Common subexpression matching -- resource sharing, analysis pass */
void csm (cuc_func *f);
 
/* Common subexpression matching -- resource sharing, generation pass */
void csm_gen (cuc_func *f, cuc_func *rf, cuc_shared_item *shared, int nshared);
 
/* Set the BB limits */
void detect_bb (cuc_func *func);
 
/* Optimize basic blocks */
int optimize_bb (cuc_func *func);
 
/* Search and optimize complex cmov assignments */
int optimize_cmovs (cuc_func *func);
 
/* Optimizes dataflow tree */
int optimize_tree (cuc_func *func);
 
/* Remove nop instructions */
int remove_nops (cuc_func *func);
 
/* Removes dead instruction */
int remove_dead (cuc_func *func);
 
/* Removes trivial register assignments */
int remove_trivial_regs (cuc_func *f);
 
/* Determine inputs and outputs */
void set_io (cuc_func *func);
 
/* Removes BBs marked as dead */
int remove_dead_bb (cuc_func *func);
 
/* Common subexpression elimination */
int cse (cuc_func *f);
 
/* Detect register dependencies */
void reg_dep (cuc_func *func);
 
/* Cuts the tree and marks registers */
void mark_cut (cuc_func *f);
 
/* Unroll loop b times times and return new function. Original
   function is unmodified. */
cuc_func *preunroll_loop (cuc_func *func, int b, int preroll, int unroll, char *bb_filename);
 
/* Clean memory and data dependencies */
void clean_deps (cuc_func *func);
 
/* Schedule memory accesses
  0 - exact; 1 - strong; 2 - weak;  3 - none */
int schedule_memory (cuc_func *func, int otype);
 
/* Generates verilog file out of insn dataflow */
void output_verilog (cuc_func *func, char *filename, char *funcname);
 
/* Recalculates bb[].cnt values, based on generated profile file */
void recalc_cnts (cuc_func *f, char *bb_filename);
 
/* Calculate timings */
void analyse_timings (cuc_func *func, cuc_timings *timings);
 
/* Calculates facts, that are determined by conditionals */
void insert_conditional_facts (cuc_func *func);
 
/* Width optimization -- detect maximum values */
void detect_max_values (cuc_func *f);
 
/* Inserts n nops before insn 'ref' */
void insert_insns (cuc_func *f, int ref, int n);
 
#endif /* __DATAF_H__ */