iginators are transitively included in this set.  */
  bitmap originators;

  /* A hashtable caching the result of insn transformations through this one.  */
  htab_t transformed_insns;

  /* A context incapsulating this insn.  */
  class deps_desc deps_context;

  /* This field is initialized at the beginning of scheduling and is used
     to handle sched group instructions.  If it is non-null, then it points
     to the instruction, which should be forced to schedule next.  Such
     instructions are unique.  */
  insn_t sched_next;

  /* Cycle at which insn was scheduled.  It is greater than zero if insn was
     scheduled.  This is used for bundling.  */
  int sched_cycle;

  /* Cycle at which insn's data will be fully ready.  */
  int ready_cycle;

  /* Speculations that are being checked by this insn.  */
  ds_t spec_checked_ds;

  /* Whether the live set valid or not.  */
  BOOL_BITFIELD live_valid_p : 1;
  /* Insn is an ASM.  */
  BOOL_BITFIELD asm_p : 1;

  /* True when an insn is scheduled after we've determined that a stall is
     required.
     This is used when emulating the Haifa scheduler for bundling.  */
  BOOL_BITFIELD after_stall_p : 1;
};

typedef class _sel_insn_data sel_insn_data_def;
typedef sel_insn_data_def *sel_insn_data_t;

extern vec<sel_insn_data_def> s_i_d;

/* Accessor macros for s_i_d.  */
#define SID(INSN) (&s_i_d[INSN_LUID (INSN)])
#define SID_BY_UID(UID) (&s_i_d[LUID_BY_UID (UID)])

extern sel_insn_data_def insn_sid (insn_t);

#define INSN_ASM_P(INSN) (SID (INSN)->asm_p)
#define INSN_SCHED_NEXT(INSN) (SID (INSN)->sched_next)
#define INSN_ANALYZED_DEPS(INSN) (SID (INSN)->analyzed_deps)
#define INSN_FOUND_DEPS(INSN) (SID (INSN)->found_deps)
#define INSN_DEPS_CONTEXT(INSN) (SID (INSN)->deps_context)
#define INSN_ORIGINATORS(INSN) (SID (INSN)->originators)
#define INSN_ORIGINATORS_BY_UID(UID) (SID_BY_UID (UID)->originators)
#define INSN_TRANSFORMED_INSNS(INSN) (SID (INSN)->transformed_insns)

#define INSN_EXPR(INSN) (&SID (INSN)->expr)
#define INSN_LIVE(INSN) (SID (INSN)->live)
#define INSN_LIVE_VALID_P(INSN) (SID (INSN)->live_valid_p)
#define INSN_VINSN(INSN) (EXPR_VINSN (INSN_EXPR (INSN)))
#define INSN_TYPE(INSN) (VINSN_TYPE (INSN_VINSN (INSN)))
#define INSN_SIMPLEJUMP_P(INSN) (INSN_TYPE (INSN) == PC)
#define INSN_LHS(INSN) (VINSN_LHS (INSN_VINSN (INSN)))
#define INSN_RHS(INSN) (VINSN_RHS (INSN_VINSN (INSN)))
#define INSN_REG_SETS(INSN) (VINSN_REG_SETS (INSN_VINSN (INSN)))
#define INSN_REG_CLOBBERS(INSN) (VINSN_REG_CLOBBERS (INSN_VINSN (INSN)))
#define INSN_REG_USES(INSN) (VINSN_REG_USES (INSN_VINSN (INSN)))
#define INSN_SCHED_TIMES(INSN) (EXPR_SCHED_TIMES (INSN_EXPR (INSN)))
#define INSN_SEQNO(INSN) (SID (INSN)->seqno)
#define INSN_AFTER_STALL_P(INSN) (SID (INSN)->after_stall_p)
#define INSN_SCHED_CYCLE(INSN) (SID (INSN)->sched_cycle)
#define INSN_READY_CYCLE(INSN) (SID (INSN)->ready_cycle)
#define INSN_SPEC_CHECKED_DS(INSN) (SID (INSN)->spec_checked_ds)

/* A global level shows whether an insn is valid or not.  */
extern int global_level;

#define INSN_WS_LEVEL(INSN) (SID (INSN)->ws_level)

extern av_set_t get_av_set (insn_t);
extern int get_av_level (insn_t);

#define AV_SET(INSN) (get_av_set (INSN))
#define AV_LEVEL(INSN) (get_av_level (INSN))
#define AV_SET_VALID_P(INSN) (AV_LEVEL (INSN) == global_level)

/* A list of fences currently in the works.  */
extern flist_t fences;

/* A NOP pattern used as a placeholder for real insns.  */
extern rtx nop_pattern;

/* An insn that 'contained' in EXIT block.  */
extern rtx_insn *exit_insn;

/* Provide a separate luid for the insn.  */
#define INSN_INIT_TODO_LUID (1)

/* Initialize s_s_i_d.  */
#define INSN_INIT_TODO_SSID (2)

/* Initialize data for simplejump.  */
#define INSN_INIT_TODO_SIMPLEJUMP (4)

/* Return true if INSN is a local NOP.  The nop is local in the sense that
   it was emitted by the scheduler as a temporary insn and will soon be
   deleted.  These nops are identified by their pattern.  */
#define INSN_NOP_P(INSN) (PATTERN (INSN) == nop_pattern)

/* Return true if INSN is linked into instruction stream.
   NB: It is impossible for INSN to have one field null and the other not
   null: gcc_assert ((PREV_INSN (INSN) == NULL_RTX)
   == (NEXT_INSN (INSN) == NULL_RTX)) is valid.  */
#define INSN_IN_STREAM_P(INSN) (PREV_INSN (INSN) && NEXT_INSN (INSN))

/* Return true if INSN is in current fence.  */
#define IN_CURRENT_FENCE_P(INSN) (flist_lookup (fences, INSN) != NULL)

/* Marks loop as being considered for pipelining.  */
#define MARK_LOOP_FOR_PIPELINING(LOOP) ((LOOP)->aux = (void *)(size_t)(1))
#define LOOP_MARKED_FOR_PIPELINING_P(LOOP) ((size_t)((LOOP)->aux))

/* Saved loop preheader to transfer when scheduling the loop.  */
#define LOOP_PREHEADER_BLOCKS(LOOP) ((size_t)((LOOP)->aux) == 1         \
                                     ? NULL                             \
                                     : ((vec<basic_block> *) (LOOP)->aux))
#define SET_LOOP_PREHEADER_BLOCKS(LOOP,BLOCKS) ((LOOP)->aux             \
                                                = (BLOCKS != NULL       \
                                                   ? BLOCKS             \
                                                   : (LOOP)->aux))

extern bitmap blocks_to_reschedule;
