/* Instruction scheduling pass. This file contains definitions used
internally in the scheduler.
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of GCC.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
+
+#ifndef GCC_SCHED_INT_H
+#define GCC_SCHED_INT_H
+
+/* For state_t. */
+#include "insn-attr.h"
+/* For regset_head. */
+#include "basic-block.h"
+/* For reg_note. */
+#include "rtl.h"
/* Pointer to data describing the current DFA state. */
extern state_t curr_state;
/* Forward declaration. */
struct ready_list;
+/* Type to represent status of a dependence. */
+typedef int ds_t;
+
+/* Type to represent weakness of speculative dependence. */
+typedef int dw_t;
+
/* Describe state of dependencies used during sched_analyze phase. */
struct deps
{
scheduling is done. */
rtx sched_before_next_call;
- /* Used to keep post-call psuedo/hard reg movements together with
+ /* Used to keep post-call pseudo/hard reg movements together with
the call. */
- bool in_post_call_group_p;
+ enum { not_post_call, post_call, post_call_initial } in_post_call_group_p;
/* Set to the tail insn of the outermost libcall block.
/* Element N is set for each register that has any nonzero element
in reg_last[N].{uses,sets,clobbers}. */
regset_head reg_last_in_use;
+
+ /* Element N is set for each register that is conditionally set. */
+ regset_head reg_conditional_sets;
};
/* This structure holds some state of the current scheduling pass, and
{
/* Add all insns that are initially ready to the ready list. Called once
before scheduling a set of insns. */
- void (*init_ready_list) PARAMS ((struct ready_list *));
+ void (*init_ready_list) (void);
/* Called after taking an insn from the ready list. Returns nonzero if
this insn can be scheduled, nonzero if we should silently discard it. */
- int (*can_schedule_ready_p) PARAMS ((rtx));
+ int (*can_schedule_ready_p) (rtx);
/* Return nonzero if there are more insns that should be scheduled. */
- int (*schedule_more_p) PARAMS ((void));
- /* Called after an insn has all its dependencies resolved. Return nonzero
- if it should be moved to the ready list or the queue, or zero if we
- should silently discard it. */
- int (*new_ready) PARAMS ((rtx));
+ int (*schedule_more_p) (void);
+ /* Called after an insn has all its hard dependencies resolved.
+ Adjusts status of instruction (which is passed through second parameter)
+ to indicate if instruction should be moved to the ready list or the
+ queue, or if it should silently discard it (until next resolved
+ dependence). */
+ ds_t (*new_ready) (rtx, ds_t);
/* Compare priority of two insns. Return a positive number if the second
insn is to be preferred for scheduling, and a negative one if the first
is to be preferred. Zero if they are equally good. */
- int (*rank) PARAMS ((rtx, rtx));
+ int (*rank) (rtx, rtx);
/* Return a string that contains the insn uid and optionally anything else
necessary to identify this insn in an output. It's valid to use a
static buffer for this. The ALIGNED parameter should cause the string
to be formatted so that multiple output lines will line up nicely. */
- const char *(*print_insn) PARAMS ((rtx, int));
+ const char *(*print_insn) (rtx, int);
/* Return nonzero if an insn should be included in priority
calculations. */
- int (*contributes_to_priority) PARAMS ((rtx, rtx));
+ int (*contributes_to_priority) (rtx, rtx);
/* Called when computing dependencies for a JUMP_INSN. This function
should store the set of registers that must be considered as set by
the jump in the regset. */
- void (*compute_jump_reg_dependencies) PARAMS ((rtx, regset));
+ void (*compute_jump_reg_dependencies) (rtx, regset, regset, regset);
/* The boundaries of the set of insns to be scheduled. */
rtx prev_head, next_tail;
has completed, e.g. if we're using it to initialize state for successor
blocks in region scheduling. */
unsigned int use_cselib:1;
+
+ /* Maximum priority that has been assigned to an insn. */
+ int sched_max_insns_priority;
+
+ /* Hooks to support speculative scheduling. */
+
+ /* Called to notify frontend that instruction is being added (second
+ parameter == 0) or removed (second parameter == 1). */
+ void (*add_remove_insn) (rtx, int);
+
+ /* Called to notify frontend that instruction is being scheduled.
+ The first parameter - instruction to scheduled, the second parameter -
+ last scheduled instruction. */
+ void (*begin_schedule_ready) (rtx, rtx);
+
+ /* Called to notify frontend, that new basic block is being added.
+ The first parameter - new basic block.
+ The second parameter - block, after which new basic block is being added,
+ or EXIT_BLOCK_PTR, if recovery block is being added,
+ or NULL, if standalone block is being added. */
+ void (*add_block) (basic_block, basic_block);
+
+ /* If the second parameter is not NULL, return nonnull value, if the
+ basic block should be advanced.
+ If the second parameter is NULL, return the next basic block in EBB.
+ The first parameter is the current basic block in EBB. */
+ basic_block (*advance_target_bb) (basic_block, rtx);
+
+ /* Called after blocks were rearranged due to movement of jump instruction.
+ The first parameter - index of basic block, in which jump currently is.
+ The second parameter - index of basic block, in which jump used
+ to be.
+ The third parameter - index of basic block, that follows the second
+ parameter. */
+ void (*fix_recovery_cfg) (int, int, int);
+
+#ifdef ENABLE_CHECKING
+ /* If the second parameter is zero, return nonzero, if block is head of the
+ region.
+ If the second parameter is nonzero, return nonzero, if block is leaf of
+ the region.
+ global_live_at_start should not change in region heads and
+ global_live_at_end should not change in region leafs due to scheduling. */
+ int (*region_head_or_leaf_p) (basic_block, int);
+#endif
+
+ /* ??? FIXME: should use straight bitfields inside sched_info instead of
+ this flag field. */
+ unsigned int flags;
+};
+
+/* This structure holds description of the properties for speculative
+ scheduling. */
+struct spec_info_def
+{
+ /* Holds types of allowed speculations: BEGIN_{DATA|CONTROL},
+ BE_IN_{DATA_CONTROL}. */
+ int mask;
+
+ /* A dump file for additional information on speculative scheduling. */
+ FILE *dump;
+
+ /* Minimal cumulative weakness of speculative instruction's
+ dependencies, so that insn will be scheduled. */
+ dw_t weakness_cutoff;
+
+ /* Flags from the enum SPEC_SCHED_FLAGS. */
+ int flags;
};
+typedef struct spec_info_def *spec_info_t;
extern struct sched_info *current_sched_info;
it represents forward dependencies. */
rtx depend;
+ /* A list of scheduled producers of the instruction. Links are being moved
+ from LOG_LINKS to RESOLVED_DEPS during scheduling. */
+ rtx resolved_deps;
+
/* The line number note in effect for each insn. For line number
notes, this indicates whether the note may be reused. */
rtx line_note;
int priority;
/* The number of incoming edges in the forward dependency graph.
- As scheduling proceds, counts are decreased. An insn moves to
+ As scheduling proceeds, counts are decreased. An insn moves to
the ready queue when its counter reaches zero. */
int dep_count;
- /* An encoding of the blockage range function. Both unit and range
- are coded. This member is used only for old pipeline interface. */
- unsigned int blockage;
-
/* Number of instructions referring to this insn. */
int ref_count;
used to note timing constraints for the insns in the pending list. */
int tick;
- short cost;
+ /* INTER_TICK is used to adjust INSN_TICKs of instructions from the
+ subsequent blocks in a region. */
+ int inter_tick;
+
+ /* See comment on QUEUE_INDEX macro in haifa-sched.c. */
+ int queue_index;
- /* An encoding of the function units used. This member is used only
- for old pipeline interface. */
- short units;
+ short cost;
/* This weight is an estimation of the insn's contribution to
register pressure. */
/* Nonzero if priority has been computed already. */
unsigned int priority_known : 1;
+
+ /* Nonzero if instruction has internal dependence
+ (e.g. add_dependence was invoked with (insn == elem)). */
+ unsigned int has_internal_dep : 1;
+
+ /* What speculations are necessary to apply to schedule the instruction. */
+ ds_t todo_spec;
+ /* What speculations were already applied. */
+ ds_t done_spec;
+ /* What speculations are checked by this instruction. */
+ ds_t check_spec;
+
+ /* Recovery block for speculation checks. */
+ basic_block recovery_block;
+
+ /* Original pattern of the instruction. */
+ rtx orig_pat;
};
extern struct haifa_insn_data *h_i_d;
+/* Used only if (current_sched_info->flags & USE_GLAT) != 0.
+ These regsets store global_live_at_{start, end} information
+ for each basic block. */
+extern regset *glat_start, *glat_end;
/* Accessor macros for h_i_d. There are more in haifa-sched.c and
sched-rgn.c. */
#define INSN_DEPEND(INSN) (h_i_d[INSN_UID (INSN)].depend)
+#define RESOLVED_DEPS(INSN) (h_i_d[INSN_UID (INSN)].resolved_deps)
#define INSN_LUID(INSN) (h_i_d[INSN_UID (INSN)].luid)
#define CANT_MOVE(insn) (h_i_d[INSN_UID (insn)].cant_move)
#define INSN_DEP_COUNT(INSN) (h_i_d[INSN_UID (INSN)].dep_count)
#define INSN_PRIORITY(INSN) (h_i_d[INSN_UID (INSN)].priority)
#define INSN_PRIORITY_KNOWN(INSN) (h_i_d[INSN_UID (INSN)].priority_known)
#define INSN_COST(INSN) (h_i_d[INSN_UID (INSN)].cost)
-#define INSN_UNIT(INSN) (h_i_d[INSN_UID (INSN)].units)
#define INSN_REG_WEIGHT(INSN) (h_i_d[INSN_UID (INSN)].reg_weight)
+#define HAS_INTERNAL_DEP(INSN) (h_i_d[INSN_UID (INSN)].has_internal_dep)
+#define TODO_SPEC(INSN) (h_i_d[INSN_UID (INSN)].todo_spec)
+#define DONE_SPEC(INSN) (h_i_d[INSN_UID (INSN)].done_spec)
+#define CHECK_SPEC(INSN) (h_i_d[INSN_UID (INSN)].check_spec)
+#define RECOVERY_BLOCK(INSN) (h_i_d[INSN_UID (INSN)].recovery_block)
+#define ORIG_PAT(INSN) (h_i_d[INSN_UID (INSN)].orig_pat)
+
+/* DEP_STATUS of the link encapsulates information, that is needed for
+ speculative scheduling. Namely, it is 4 integers in the range
+ [0, MAX_DEP_WEAK] and 3 bits.
+ The integers correspond to the probability of the dependence to *not*
+ exist, it is the probability, that overcoming of this dependence will
+ not be followed by execution of the recovery code. Nevertheless,
+ whatever high the probability of success is, recovery code should still
+ be generated to preserve semantics of the program. To find a way to
+ get/set these integers, please refer to the {get, set}_dep_weak ()
+ functions in sched-deps.c .
+ The 3 bits in the DEP_STATUS correspond to 3 dependence types: true-,
+ output- and anti- dependence. It is not enough for speculative scheduling
+ to know just the major type of all the dependence between two instructions,
+ as only true dependence can be overcome.
+ There also is the 4-th bit in the DEP_STATUS (HARD_DEP), that is reserved
+ for using to describe instruction's status. It is set whenever instruction
+ has at least one dependence, that cannot be overcome.
+ See also: check_dep_status () in sched-deps.c . */
+#define DEP_STATUS(LINK) XINT (LINK, 2)
+
+/* We exclude sign bit. */
+#define BITS_PER_DEP_STATUS (HOST_BITS_PER_INT - 1)
+
+/* First '4' stands for 3 dep type bits and HARD_DEP bit.
+ Second '4' stands for BEGIN_{DATA, CONTROL}, BE_IN_{DATA, CONTROL}
+ dep weakness. */
+#define BITS_PER_DEP_WEAK ((BITS_PER_DEP_STATUS - 4) / 4)
+
+/* Mask of speculative weakness in dep_status. */
+#define DEP_WEAK_MASK ((1 << BITS_PER_DEP_WEAK) - 1)
+
+/* This constant means that dependence is fake with 99.999...% probability.
+ This is the maximum value, that can appear in dep_status.
+ Note, that we don't want MAX_DEP_WEAK to be the same as DEP_WEAK_MASK for
+ debugging reasons. Though, it can be set to DEP_WEAK_MASK, and, when
+ done so, we'll get fast (mul for)/(div by) NO_DEP_WEAK. */
+#define MAX_DEP_WEAK (DEP_WEAK_MASK - 1)
+
+/* This constant means that dependence is 99.999...% real and it is a really
+ bad idea to overcome it (though this can be done, preserving program
+ semantics). */
+#define MIN_DEP_WEAK 1
+
+/* This constant represents 100% probability.
+ E.g. it is used to represent weakness of dependence, that doesn't exist. */
+#define NO_DEP_WEAK (MAX_DEP_WEAK + MIN_DEP_WEAK)
+
+/* Default weakness of speculative dependence. Used when we can't say
+ neither bad nor good about the dependence. */
+#define UNCERTAIN_DEP_WEAK (MAX_DEP_WEAK - MAX_DEP_WEAK / 4)
+
+/* Offset for speculative weaknesses in dep_status. */
+enum SPEC_TYPES_OFFSETS {
+ BEGIN_DATA_BITS_OFFSET = 0,
+ BE_IN_DATA_BITS_OFFSET = BEGIN_DATA_BITS_OFFSET + BITS_PER_DEP_WEAK,
+ BEGIN_CONTROL_BITS_OFFSET = BE_IN_DATA_BITS_OFFSET + BITS_PER_DEP_WEAK,
+ BE_IN_CONTROL_BITS_OFFSET = BEGIN_CONTROL_BITS_OFFSET + BITS_PER_DEP_WEAK
+};
-#define INSN_BLOCKAGE(INSN) (h_i_d[INSN_UID (INSN)].blockage)
-#define UNIT_BITS 5
-#define BLOCKAGE_MASK ((1 << BLOCKAGE_BITS) - 1)
-#define ENCODE_BLOCKAGE(U, R) \
- (((U) << BLOCKAGE_BITS \
- | MIN_BLOCKAGE_COST (R)) << BLOCKAGE_BITS \
- | MAX_BLOCKAGE_COST (R))
-#define UNIT_BLOCKED(B) ((B) >> (2 * BLOCKAGE_BITS))
-#define BLOCKAGE_RANGE(B) \
- (((((B) >> BLOCKAGE_BITS) & BLOCKAGE_MASK) << (HOST_BITS_PER_INT / 2)) \
- | ((B) & BLOCKAGE_MASK))
-
-/* Encodings of the `<name>_unit_blockage_range' function. */
-#define MIN_BLOCKAGE_COST(R) ((R) >> (HOST_BITS_PER_INT / 2))
-#define MAX_BLOCKAGE_COST(R) ((R) & ((1 << (HOST_BITS_PER_INT / 2)) - 1))
+/* The following defines provide numerous constants used to distinguish between
+ different types of speculative dependencies. */
+
+/* Dependence can be overcome with generation of new data speculative
+ instruction. */
+#define BEGIN_DATA (((ds_t) DEP_WEAK_MASK) << BEGIN_DATA_BITS_OFFSET)
+
+/* This dependence is to the instruction in the recovery block, that was
+ formed to recover after data-speculation failure.
+ Thus, this dependence can overcome with generating of the copy of
+ this instruction in the recovery block. */
+#define BE_IN_DATA (((ds_t) DEP_WEAK_MASK) << BE_IN_DATA_BITS_OFFSET)
+
+/* Dependence can be overcome with generation of new control speculative
+ instruction. */
+#define BEGIN_CONTROL (((ds_t) DEP_WEAK_MASK) << BEGIN_CONTROL_BITS_OFFSET)
+
+/* This dependence is to the instruction in the recovery block, that was
+ formed to recover after control-speculation failure.
+ Thus, this dependence can be overcome with generating of the copy of
+ this instruction in the recovery block. */
+#define BE_IN_CONTROL (((ds_t) DEP_WEAK_MASK) << BE_IN_CONTROL_BITS_OFFSET)
+
+/* A few convenient combinations. */
+#define BEGIN_SPEC (BEGIN_DATA | BEGIN_CONTROL)
+#define DATA_SPEC (BEGIN_DATA | BE_IN_DATA)
+#define CONTROL_SPEC (BEGIN_CONTROL | BE_IN_CONTROL)
+#define SPECULATIVE (DATA_SPEC | CONTROL_SPEC)
+#define BE_IN_SPEC (BE_IN_DATA | BE_IN_CONTROL)
+
+/* Constants, that are helpful in iterating through dep_status. */
+#define FIRST_SPEC_TYPE BEGIN_DATA
+#define LAST_SPEC_TYPE BE_IN_CONTROL
+#define SPEC_TYPE_SHIFT BITS_PER_DEP_WEAK
+
+/* Dependence on instruction can be of multiple types
+ (e.g. true and output). This fields enhance REG_NOTE_KIND information
+ of the dependence. */
+#define DEP_TRUE (((ds_t) 1) << (BE_IN_CONTROL_BITS_OFFSET + BITS_PER_DEP_WEAK))
+#define DEP_OUTPUT (DEP_TRUE << 1)
+#define DEP_ANTI (DEP_OUTPUT << 1)
+
+#define DEP_TYPES (DEP_TRUE | DEP_OUTPUT | DEP_ANTI)
+
+/* Instruction has non-speculative dependence. This bit represents the
+ property of an instruction - not the one of a dependence.
+ Therefore, it can appear only in TODO_SPEC field of an instruction. */
+#define HARD_DEP (DEP_ANTI << 1)
+
+/* This represents the results of calling sched-deps.c functions,
+ which modify dependencies. Possible choices are: a dependence
+ is already present and nothing has been changed; a dependence type
+ has been changed; brand new dependence has been created. */
+enum DEPS_ADJUST_RESULT {
+ DEP_PRESENT = 1,
+ DEP_CHANGED = 2,
+ DEP_CREATED = 3
+};
+
+/* Represents the bits that can be set in the flags field of the
+ sched_info structure. */
+enum SCHED_FLAGS {
+ /* If set, generate links between instruction as DEPS_LIST.
+ Otherwise, generate usual INSN_LIST links. */
+ USE_DEPS_LIST = 1,
+ /* Perform data or control (or both) speculation.
+ Results in generation of data and control speculative dependencies.
+ Requires USE_DEPS_LIST set. */
+ DO_SPECULATION = USE_DEPS_LIST << 1,
+ SCHED_RGN = DO_SPECULATION << 1,
+ SCHED_EBB = SCHED_RGN << 1,
+ /* Detach register live information from basic block headers.
+ This is necessary to invoke functions, that change CFG (e.g. split_edge).
+ Requires USE_GLAT. */
+ DETACH_LIFE_INFO = SCHED_EBB << 1,
+ /* Save register live information from basic block headers to
+ glat_{start, end} arrays. */
+ USE_GLAT = DETACH_LIFE_INFO << 1
+};
+
+enum SPEC_SCHED_FLAGS {
+ COUNT_SPEC_IN_CRITICAL_PATH = 1,
+ PREFER_NON_DATA_SPEC = COUNT_SPEC_IN_CRITICAL_PATH << 1,
+ PREFER_NON_CONTROL_SPEC = PREFER_NON_DATA_SPEC << 1
+};
+
+#define NOTE_NOT_BB_P(NOTE) (NOTE_P (NOTE) && (NOTE_LINE_NUMBER (NOTE) \
+ != NOTE_INSN_BASIC_BLOCK))
extern FILE *sched_dump;
extern int sched_verbose;
#endif
/* Functions in sched-vis.c. */
-extern void init_target_units PARAMS ((void));
-extern void insn_print_units PARAMS ((rtx));
-extern void init_block_visualization PARAMS ((void));
-extern void print_block_visualization PARAMS ((const char *));
-extern void visualize_scheduled_insns PARAMS ((int));
-extern void visualize_no_unit PARAMS ((rtx));
-extern void visualize_stall_cycles PARAMS ((int));
-extern void visualize_alloc PARAMS ((void));
-extern void visualize_free PARAMS ((void));
+extern void print_insn (char *, rtx, int);
/* Functions in sched-deps.c. */
-extern int add_dependence PARAMS ((rtx, rtx, enum reg_note));
-extern void add_insn_mem_dependence PARAMS ((struct deps *, rtx *, rtx *, rtx,
- rtx));
-extern void sched_analyze PARAMS ((struct deps *, rtx, rtx));
-extern void init_deps PARAMS ((struct deps *));
-extern void free_deps PARAMS ((struct deps *));
-extern void init_deps_global PARAMS ((void));
-extern void finish_deps_global PARAMS ((void));
-extern void add_forward_dependence PARAMS ((rtx, rtx, enum reg_note));
-extern void compute_forward_dependences PARAMS ((rtx, rtx));
-extern rtx find_insn_list PARAMS ((rtx, rtx));
-extern void init_dependency_caches PARAMS ((int));
-extern void free_dependency_caches PARAMS ((void));
+extern bool sched_insns_conditions_mutex_p (rtx, rtx);
+extern void add_dependence (rtx, rtx, enum reg_note);
+extern void sched_analyze (struct deps *, rtx, rtx);
+extern void init_deps (struct deps *);
+extern void free_deps (struct deps *);
+extern void init_deps_global (void);
+extern void finish_deps_global (void);
+extern void add_forw_dep (rtx, rtx);
+extern void compute_forward_dependences (rtx, rtx);
+extern rtx find_insn_list (rtx, rtx);
+extern void init_dependency_caches (int);
+extern void free_dependency_caches (void);
+extern void extend_dependency_caches (int, bool);
+extern enum DEPS_ADJUST_RESULT add_or_update_back_dep (rtx, rtx,
+ enum reg_note, ds_t);
+extern void add_or_update_back_forw_dep (rtx, rtx, enum reg_note, ds_t);
+extern void add_back_forw_dep (rtx, rtx, enum reg_note, ds_t);
+extern void delete_back_forw_dep (rtx, rtx);
+extern dw_t get_dep_weak (ds_t, ds_t);
+extern ds_t set_dep_weak (ds_t, ds_t, dw_t);
+extern ds_t ds_merge (ds_t, ds_t);
/* Functions in haifa-sched.c. */
-extern int haifa_classify_insn PARAMS ((rtx));
-extern void get_block_head_tail PARAMS ((int, rtx *, rtx *));
-extern int no_real_insns_p PARAMS ((rtx, rtx));
-
-extern void rm_line_notes PARAMS ((rtx, rtx));
-extern void save_line_notes PARAMS ((int, rtx, rtx));
-extern void restore_line_notes PARAMS ((rtx, rtx));
-extern void rm_redundant_line_notes PARAMS ((void));
-extern void rm_other_notes PARAMS ((rtx, rtx));
-
-extern int insn_issue_delay PARAMS ((rtx));
-extern int set_priorities PARAMS ((rtx, rtx));
-
-extern rtx sched_emit_insn PARAMS ((rtx));
-extern void schedule_block PARAMS ((int, int));
-extern void sched_init PARAMS ((FILE *));
-extern void sched_finish PARAMS ((void));
-
-extern void ready_add PARAMS ((struct ready_list *, rtx));
-
-/* The following are exported for the benefit of debugging functions. It
- would be nicer to keep them private to haifa-sched.c. */
-extern int insn_unit PARAMS ((rtx));
-extern int insn_cost PARAMS ((rtx, rtx, rtx));
-extern rtx get_unit_last_insn PARAMS ((int));
-extern int actual_hazard_this_instance PARAMS ((int, int, rtx, int, int));
-extern void print_insn PARAMS ((char *, rtx, int));
+extern int haifa_classify_insn (rtx);
+extern void get_ebb_head_tail (basic_block, basic_block, rtx *, rtx *);
+extern int no_real_insns_p (rtx, rtx);
+
+extern void rm_line_notes (rtx, rtx);
+extern void save_line_notes (int, rtx, rtx);
+extern void restore_line_notes (rtx, rtx);
+extern void rm_redundant_line_notes (void);
+extern void rm_other_notes (rtx, rtx);
+
+extern int insn_cost (rtx, rtx, rtx);
+extern int set_priorities (rtx, rtx);
+
+extern void schedule_block (basic_block *, int);
+extern void sched_init (void);
+extern void sched_finish (void);
+
+extern int try_ready (rtx);
+extern void * xrecalloc (void *, size_t, size_t, size_t);
+extern void unlink_bb_notes (basic_block, basic_block);
+extern void add_block (basic_block, basic_block);
+extern void attach_life_info (void);
+extern rtx bb_note (basic_block);
+
+#ifdef ENABLE_CHECKING
+extern void check_reg_live (bool);
+#endif
+
+#endif /* GCC_SCHED_INT_H */
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