/* Instruction scheduling pass.
- Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
+ 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ Free Software Foundation, Inc.
Contributed by Michael Tiemann (tiemann@cygnus.com) Enhanced by,
and currently maintained by, Jim Wilson (wilson@cygnus.com)
GCC 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, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
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, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* Instruction scheduling pass. This file, along with sched-deps.c,
contains the generic parts. The actual entry point is found for
compute_block_backward_dependences ().
Dependencies set up by memory references are treated in exactly the
- same way as other dependencies, by using LOG_LINKS backward
- dependences. LOG_LINKS are translated into INSN_DEPEND forward
- dependences for the purpose of forward list scheduling.
+ same way as other dependencies, by using insn backward dependences
+ INSN_BACK_DEPS. INSN_BACK_DEPS are translated into forward dependences
+ INSN_FORW_DEPS the purpose of forward list scheduling.
Having optimized the critical path, we may have also unduly
extended the lifetimes of some registers. If an operation requires
#include "sched-int.h"
#include "target.h"
#include "output.h"
+#include "params.h"
+#include "dbgcnt.h"
#ifdef INSN_SCHEDULING
struct haifa_insn_data *h_i_d;
-#define LINE_NOTE(INSN) (h_i_d[INSN_UID (INSN)].line_note)
#define INSN_TICK(INSN) (h_i_d[INSN_UID (INSN)].tick)
#define INTER_TICK(INSN) (h_i_d[INSN_UID (INSN)].inter_tick)
/* The minimal value of the INSN_TICK of an instruction. */
#define MIN_TICK (-max_insn_queue_index)
-/* Vector indexed by basic block number giving the starting line-number
- for each basic block. */
-static rtx *line_note_head;
+/* Issue points are used to distinguish between instructions in max_issue ().
+ For now, all instructions are equally good. */
+#define ISSUE_POINTS(INSN) 1
/* List of important notes we must keep around. This is a pointer to the
last element in the list. */
static rtx note_list;
+static struct spec_info_def spec_info_var;
+/* Description of the speculative part of the scheduling.
+ If NULL - no speculation. */
+spec_info_t spec_info;
+
+/* True, if recovery block was added during scheduling of current block.
+ Used to determine, if we need to fix INSN_TICKs. */
+static bool haifa_recovery_bb_recently_added_p;
+
+/* True, if recovery block was added during this scheduling pass.
+ Used to determine if we should have empty memory pools of dependencies
+ after finishing current region. */
+bool haifa_recovery_bb_ever_added_p;
+
+/* Counters of different types of speculative instructions. */
+static int nr_begin_data, nr_be_in_data, nr_begin_control, nr_be_in_control;
+
+/* Array used in {unlink, restore}_bb_notes. */
+static rtx *bb_header = 0;
+
+/* Number of basic_blocks. */
+static int old_last_basic_block;
+
+/* Basic block after which recovery blocks will be created. */
+static basic_block before_recovery;
+
/* Queues, etc. */
/* An instruction is ready to be scheduled when all insns preceding it
sufficient time has passed to make them ready. As time passes,
insns move from the "Queued" set to the "Ready" list.
- The "Pending" list (P) are the insns in the INSN_DEPEND of the unscheduled
- insns, i.e., those that are ready, queued, and pending.
+ The "Pending" list (P) are the insns in the INSN_FORW_DEPS of the
+ unscheduled insns, i.e., those that are ready, queued, and pending.
The "Queued" set (Q) is implemented by the variable `insn_queue'.
The "Ready" list (R) is implemented by the variables `ready' and
`n_ready'.
/* Scheduling clock. */
static int clock_var;
-static int may_trap_exp (rtx, int);
+/* Number of instructions in current scheduling region. */
+static int rgn_n_insns;
+
+static int may_trap_exp (const_rtx, int);
/* Nonzero iff the address is comprised from at most 1 register. */
#define CONST_BASED_ADDRESS_P(x) \
as found by analyzing insn's expression. */
static int
-may_trap_exp (rtx x, int is_store)
+may_trap_exp (const_rtx x, int is_store)
{
enum rtx_code code;
}
}
-/* Classifies insn for the purpose of verifying that it can be
- moved speculatively, by examining it's patterns, returning:
+/* Classifies rtx X of an insn for the purpose of verifying that X can be
+ executed speculatively (and consequently the insn can be moved
+ speculatively), by examining X, returning:
TRAP_RISKY: store, or risky non-load insn (e.g. division by variable).
TRAP_FREE: non-load insn.
IFREE: load from a globally safe location.
PFREE_CANDIDATE, PRISKY_CANDIDATE: load that need to be checked for
being either PFREE or PRISKY. */
-int
-haifa_classify_insn (rtx insn)
+static int
+haifa_classify_rtx (const_rtx x)
{
- rtx pat = PATTERN (insn);
int tmp_class = TRAP_FREE;
int insn_class = TRAP_FREE;
enum rtx_code code;
- if (GET_CODE (pat) == PARALLEL)
+ if (GET_CODE (x) == PARALLEL)
{
- int i, len = XVECLEN (pat, 0);
+ int i, len = XVECLEN (x, 0);
for (i = len - 1; i >= 0; i--)
{
- code = GET_CODE (XVECEXP (pat, 0, i));
- switch (code)
- {
- case CLOBBER:
- /* Test if it is a 'store'. */
- tmp_class = may_trap_exp (XEXP (XVECEXP (pat, 0, i), 0), 1);
- break;
- case SET:
- /* Test if it is a store. */
- tmp_class = may_trap_exp (SET_DEST (XVECEXP (pat, 0, i)), 1);
- if (tmp_class == TRAP_RISKY)
- break;
- /* Test if it is a load. */
- tmp_class
- = WORST_CLASS (tmp_class,
- may_trap_exp (SET_SRC (XVECEXP (pat, 0, i)),
- 0));
- break;
- case COND_EXEC:
- case TRAP_IF:
- tmp_class = TRAP_RISKY;
- break;
- default:
- ;
- }
+ tmp_class = haifa_classify_rtx (XVECEXP (x, 0, i));
insn_class = WORST_CLASS (insn_class, tmp_class);
if (insn_class == TRAP_RISKY || insn_class == IRISKY)
break;
}
else
{
- code = GET_CODE (pat);
+ code = GET_CODE (x);
switch (code)
{
case CLOBBER:
/* Test if it is a 'store'. */
- tmp_class = may_trap_exp (XEXP (pat, 0), 1);
+ tmp_class = may_trap_exp (XEXP (x, 0), 1);
break;
case SET:
/* Test if it is a store. */
- tmp_class = may_trap_exp (SET_DEST (pat), 1);
+ tmp_class = may_trap_exp (SET_DEST (x), 1);
if (tmp_class == TRAP_RISKY)
break;
/* Test if it is a load. */
tmp_class =
WORST_CLASS (tmp_class,
- may_trap_exp (SET_SRC (pat), 0));
+ may_trap_exp (SET_SRC (x), 0));
break;
case COND_EXEC:
+ tmp_class = haifa_classify_rtx (COND_EXEC_CODE (x));
+ if (tmp_class == TRAP_RISKY)
+ break;
+ tmp_class = WORST_CLASS (tmp_class,
+ may_trap_exp (COND_EXEC_TEST (x), 0));
+ break;
case TRAP_IF:
tmp_class = TRAP_RISKY;
break;
return insn_class;
}
+int
+haifa_classify_insn (const_rtx insn)
+{
+ return haifa_classify_rtx (PATTERN (insn));
+}
+
+
+/* A typedef for rtx vector. */
+typedef VEC(rtx, heap) *rtx_vec_t;
+
/* Forward declarations. */
static int priority (rtx);
static void swap_sort (rtx *, int);
static void queue_insn (rtx, int);
static int schedule_insn (rtx);
-static int find_set_reg_weight (rtx);
-static void find_insn_reg_weight (int);
+static int find_set_reg_weight (const_rtx);
+static void find_insn_reg_weight (basic_block);
+static void find_insn_reg_weight1 (rtx);
static void adjust_priority (rtx);
static void advance_one_cycle (void);
/* Notes handling mechanism:
=========================
Generally, NOTES are saved before scheduling and restored after scheduling.
- The scheduler distinguishes between three types of notes:
-
- (1) LINE_NUMBER notes, generated and used for debugging. Here,
- before scheduling a region, a pointer to the LINE_NUMBER note is
- added to the insn following it (in save_line_notes()), and the note
- is removed (in rm_line_notes() and unlink_line_notes()). After
- scheduling the region, this pointer is used for regeneration of
- the LINE_NUMBER note (in restore_line_notes()).
+ The scheduler distinguishes between two types of notes:
- (2) LOOP_BEGIN, LOOP_END, SETJMP, EHREGION_BEG, EHREGION_END notes:
+ (1) LOOP_BEGIN, LOOP_END, SETJMP, EHREGION_BEG, EHREGION_END notes:
Before scheduling a region, a pointer to the note is added to the insn
that follows or precedes it. (This happens as part of the data dependence
computation). After scheduling an insn, the pointer contained in it is
used for regenerating the corresponding note (in reemit_notes).
- (3) All other notes (e.g. INSN_DELETED): Before scheduling a block,
+ (2) All other notes (e.g. INSN_DELETED): Before scheduling a block,
these notes are put in a list (in rm_other_notes() and
unlink_other_notes ()). After scheduling the block, these notes are
inserted at the beginning of the block (in schedule_block()). */
static rtx unlink_other_notes (rtx, rtx);
-static rtx unlink_line_notes (rtx, rtx);
-static rtx reemit_notes (rtx, rtx);
+static void reemit_notes (rtx);
static rtx *ready_lastpos (struct ready_list *);
static void ready_add (struct ready_list *, rtx, bool);
static void debug_ready_list (struct ready_list *);
-static rtx move_insn1 (rtx, rtx);
-static rtx move_insn (rtx, rtx);
+static void move_insn (rtx);
/* The following functions are used to implement multi-pass scheduling
on the first cycle. */
static rtx ready_element (struct ready_list *, int);
static rtx ready_remove (struct ready_list *, int);
static void ready_remove_insn (rtx);
-static int max_issue (struct ready_list *, int *);
+static int max_issue (struct ready_list *, int *, int);
-static rtx choose_ready (struct ready_list *);
+static int choose_ready (struct ready_list *, rtx *);
static void fix_inter_tick (rtx, rtx);
static int fix_tick_ready (rtx);
static void change_queue_index (rtx, int);
-static void resolve_dep (rtx, rtx);
+
+/* The following functions are used to implement scheduling of data/control
+ speculative instructions. */
+
+static void extend_h_i_d (void);
+static void extend_ready (int);
+static void extend_global (rtx);
+static void extend_all (rtx);
+static void init_h_i_d (rtx);
+static void generate_recovery_code (rtx);
+static void process_insn_forw_deps_be_in_spec (rtx, rtx, ds_t);
+static void begin_speculative_block (rtx);
+static void add_to_speculative_block (rtx);
+static dw_t dep_weak (ds_t);
+static edge find_fallthru_edge (basic_block);
+static void init_before_recovery (void);
+static basic_block create_recovery_block (void);
+static void create_check_block_twin (rtx, bool);
+static void fix_recovery_deps (basic_block);
+static void change_pattern (rtx, rtx);
+static int speculate_insn (rtx, ds_t, rtx *);
+static void dump_new_block_header (int, basic_block, rtx, rtx);
+static void restore_bb_notes (basic_block);
+static void extend_bb (void);
+static void fix_jump_move (rtx);
+static void move_block_after_check (rtx);
+static void move_succs (VEC(edge,gc) **, basic_block);
+static void sched_remove_insn (rtx);
+static void clear_priorities (rtx, rtx_vec_t *);
+static void calc_priorities (rtx_vec_t);
+static void add_jump_dependencies (rtx, rtx);
+#ifdef ENABLE_CHECKING
+static int has_edge_p (VEC(edge,gc) *, int);
+static void check_cfg (rtx, rtx);
+#endif
#endif /* INSN_SCHEDULING */
\f
}
#else
+/* Working copy of frontend's sched_info variable. */
+static struct sched_info current_sched_info_var;
+
/* Pointer to the last instruction scheduled. Used by rank_for_schedule,
so that insns independent of the last scheduled insn will be preferred
over dependent instructions. */
static rtx last_scheduled_insn;
-/* Compute cost of executing INSN given the dependence LINK on the insn USED.
+/* Cached cost of the instruction. Use below function to get cost of the
+ insn. -1 here means that the field is not initialized. */
+#define INSN_COST(INSN) (h_i_d[INSN_UID (INSN)].cost)
+
+/* Compute cost of executing INSN.
This is the number of cycles between instruction issue and
instruction results. */
-
HAIFA_INLINE int
-insn_cost (rtx insn, rtx link, rtx used)
+insn_cost (rtx insn)
{
int cost = INSN_COST (insn);
}
}
- /* In this case estimate cost without caring how insn is used. */
- if (link == 0 || used == 0)
- return cost;
+ return cost;
+}
+
+/* Compute cost of dependence LINK.
+ This is the number of cycles between instruction issue and
+ instruction results. */
+int
+dep_cost (dep_t link)
+{
+ rtx used = DEP_CON (link);
+ int cost;
/* A USE insn should never require the value used to be computed.
This allows the computation of a function's result and parameter
cost = 0;
else
{
+ rtx insn = DEP_PRO (link);
+ enum reg_note dep_type = DEP_TYPE (link);
+
+ cost = insn_cost (insn);
+
if (INSN_CODE (insn) >= 0)
{
- if (REG_NOTE_KIND (link) == REG_DEP_ANTI)
+ if (dep_type == REG_DEP_ANTI)
cost = 0;
- else if (REG_NOTE_KIND (link) == REG_DEP_OUTPUT)
+ else if (dep_type == REG_DEP_OUTPUT)
{
cost = (insn_default_latency (insn)
- insn_default_latency (used));
cost = insn_latency (insn, used);
}
- if (targetm.sched.adjust_cost)
- cost = targetm.sched.adjust_cost (used, link, insn, cost);
+ if (targetm.sched.adjust_cost != NULL)
+ {
+ /* This variable is used for backward compatibility with the
+ targets. */
+ rtx dep_cost_rtx_link = alloc_INSN_LIST (NULL_RTX, NULL_RTX);
+
+ /* Make it self-cycled, so that if some tries to walk over this
+ incomplete list he/she will be caught in an endless loop. */
+ XEXP (dep_cost_rtx_link, 1) = dep_cost_rtx_link;
+
+ /* Targets use only REG_NOTE_KIND of the link. */
+ PUT_REG_NOTE_KIND (dep_cost_rtx_link, DEP_TYPE (link));
+
+ cost = targetm.sched.adjust_cost (used, dep_cost_rtx_link,
+ insn, cost);
+
+ free_INSN_LIST_node (dep_cost_rtx_link);
+ }
if (cost < 0)
cost = 0;
return cost;
}
-/* Compute the priority number for INSN. */
+/* Return 'true' if DEP should be included in priority calculations. */
+static bool
+contributes_to_priority_p (dep_t dep)
+{
+ /* Critical path is meaningful in block boundaries only. */
+ if (!current_sched_info->contributes_to_priority (DEP_CON (dep),
+ DEP_PRO (dep)))
+ return false;
+
+ /* If flag COUNT_SPEC_IN_CRITICAL_PATH is set,
+ then speculative instructions will less likely be
+ scheduled. That is because the priority of
+ their producers will increase, and, thus, the
+ producers will more likely be scheduled, thus,
+ resolving the dependence. */
+ if ((current_sched_info->flags & DO_SPECULATION)
+ && !(spec_info->flags & COUNT_SPEC_IN_CRITICAL_PATH)
+ && (DEP_STATUS (dep) & SPECULATIVE))
+ return false;
+
+ return true;
+}
+/* Compute the priority number for INSN. */
static int
priority (rtx insn)
{
- rtx link;
-
if (! INSN_P (insn))
return 0;
- if (! INSN_PRIORITY_KNOWN (insn))
+ /* We should not be interested in priority of an already scheduled insn. */
+ gcc_assert (QUEUE_INDEX (insn) != QUEUE_SCHEDULED);
+
+ if (!INSN_PRIORITY_KNOWN (insn))
{
int this_priority = 0;
- if (INSN_DEPEND (insn) == 0)
- this_priority = insn_cost (insn, 0, 0);
+ if (sd_lists_empty_p (insn, SD_LIST_FORW))
+ /* ??? We should set INSN_PRIORITY to insn_cost when and insn has
+ some forward deps but all of them are ignored by
+ contributes_to_priority hook. At the moment we set priority of
+ such insn to 0. */
+ this_priority = insn_cost (insn);
else
{
- for (link = INSN_DEPEND (insn); link; link = XEXP (link, 1))
+ rtx prev_first, twin;
+ basic_block rec;
+
+ /* For recovery check instructions we calculate priority slightly
+ different than that of normal instructions. Instead of walking
+ through INSN_FORW_DEPS (check) list, we walk through
+ INSN_FORW_DEPS list of each instruction in the corresponding
+ recovery block. */
+
+ rec = RECOVERY_BLOCK (insn);
+ if (!rec || rec == EXIT_BLOCK_PTR)
{
- rtx next;
- int next_priority;
+ prev_first = PREV_INSN (insn);
+ twin = insn;
+ }
+ else
+ {
+ prev_first = NEXT_INSN (BB_HEAD (rec));
+ twin = PREV_INSN (BB_END (rec));
+ }
+
+ do
+ {
+ sd_iterator_def sd_it;
+ dep_t dep;
+
+ FOR_EACH_DEP (twin, SD_LIST_FORW, sd_it, dep)
+ {
+ rtx next;
+ int next_priority;
- next = XEXP (link, 0);
+ next = DEP_CON (dep);
- /* Critical path is meaningful in block boundaries only. */
- if (! (*current_sched_info->contributes_to_priority) (next, insn))
- continue;
+ if (BLOCK_FOR_INSN (next) != rec)
+ {
+ int cost;
+
+ if (!contributes_to_priority_p (dep))
+ continue;
+
+ if (twin == insn)
+ cost = dep_cost (dep);
+ else
+ {
+ struct _dep _dep1, *dep1 = &_dep1;
- next_priority = insn_cost (insn, link, next) + priority (next);
- if (next_priority > this_priority)
- this_priority = next_priority;
+ init_dep (dep1, insn, next, REG_DEP_ANTI);
+
+ cost = dep_cost (dep1);
+ }
+
+ next_priority = cost + priority (next);
+
+ if (next_priority > this_priority)
+ this_priority = next_priority;
+ }
+ }
+
+ twin = PREV_INSN (twin);
}
+ while (twin != prev_first);
}
INSN_PRIORITY (insn) = this_priority;
- INSN_PRIORITY_KNOWN (insn) = 1;
+ INSN_PRIORITY_STATUS (insn) = 1;
}
return INSN_PRIORITY (insn);
{
rtx tmp = *(const rtx *) y;
rtx tmp2 = *(const rtx *) x;
- rtx link;
- int tmp_class, tmp2_class, depend_count1, depend_count2;
+ int tmp_class, tmp2_class;
int val, priority_val, weight_val, info_val;
/* The insn in a schedule group should be issued the first. */
if (SCHED_GROUP_P (tmp) != SCHED_GROUP_P (tmp2))
return SCHED_GROUP_P (tmp2) ? 1 : -1;
+ /* Make sure that priority of TMP and TMP2 are initialized. */
+ gcc_assert (INSN_PRIORITY_KNOWN (tmp) && INSN_PRIORITY_KNOWN (tmp2));
+
/* Prefer insn with higher priority. */
priority_val = INSN_PRIORITY (tmp2) - INSN_PRIORITY (tmp);
if (priority_val)
return priority_val;
+ /* Prefer speculative insn with greater dependencies weakness. */
+ if (spec_info)
+ {
+ ds_t ds1, ds2;
+ dw_t dw1, dw2;
+ int dw;
+
+ ds1 = TODO_SPEC (tmp) & SPECULATIVE;
+ if (ds1)
+ dw1 = dep_weak (ds1);
+ else
+ dw1 = NO_DEP_WEAK;
+
+ ds2 = TODO_SPEC (tmp2) & SPECULATIVE;
+ if (ds2)
+ dw2 = dep_weak (ds2);
+ else
+ dw2 = NO_DEP_WEAK;
+
+ dw = dw2 - dw1;
+ if (dw > (NO_DEP_WEAK / 8) || dw < -(NO_DEP_WEAK / 8))
+ return dw;
+ }
+
/* Prefer an insn with smaller contribution to registers-pressure. */
if (!reload_completed &&
(weight_val = INSN_REG_WEIGHT (tmp) - INSN_REG_WEIGHT (tmp2)))
/* Compare insns based on their relation to the last-scheduled-insn. */
if (INSN_P (last_scheduled_insn))
{
+ dep_t dep1;
+ dep_t dep2;
+
/* Classify the instructions into three classes:
1) Data dependent on last schedule insn.
2) Anti/Output dependent on last scheduled insn.
3) Independent of last scheduled insn, or has latency of one.
Choose the insn from the highest numbered class if different. */
- link = find_insn_list (tmp, INSN_DEPEND (last_scheduled_insn));
- if (link == 0 || insn_cost (last_scheduled_insn, link, tmp) == 1)
+ dep1 = sd_find_dep_between (last_scheduled_insn, tmp, true);
+
+ if (dep1 == NULL || dep_cost (dep1) == 1)
tmp_class = 3;
- else if (REG_NOTE_KIND (link) == 0) /* Data dependence. */
+ else if (/* Data dependence. */
+ DEP_TYPE (dep1) == REG_DEP_TRUE)
tmp_class = 1;
else
tmp_class = 2;
- link = find_insn_list (tmp2, INSN_DEPEND (last_scheduled_insn));
- if (link == 0 || insn_cost (last_scheduled_insn, link, tmp2) == 1)
+ dep2 = sd_find_dep_between (last_scheduled_insn, tmp2, true);
+
+ if (dep2 == NULL || dep_cost (dep2) == 1)
tmp2_class = 3;
- else if (REG_NOTE_KIND (link) == 0) /* Data dependence. */
+ else if (/* Data dependence. */
+ DEP_TYPE (dep2) == REG_DEP_TRUE)
tmp2_class = 1;
else
tmp2_class = 2;
/* Prefer the insn which has more later insns that depend on it.
This gives the scheduler more freedom when scheduling later
instructions at the expense of added register pressure. */
- depend_count1 = 0;
- for (link = INSN_DEPEND (tmp); link; link = XEXP (link, 1))
- depend_count1++;
- depend_count2 = 0;
- for (link = INSN_DEPEND (tmp2); link; link = XEXP (link, 1))
- depend_count2++;
+ val = (sd_lists_size (tmp2, SD_LIST_FORW)
+ - sd_lists_size (tmp, SD_LIST_FORW));
- val = depend_count2 - depend_count1;
- if (val)
+ if (val != 0)
return val;
/* If insns are equally good, sort by INSN_LUID (original insn order),
}
/* Add an element INSN to the ready list so that it ends up with the
- lowest/highest priority dependending on FIRST_P. */
+ lowest/highest priority depending on FIRST_P. */
HAIFA_INLINE static void
ready_add (struct ready_list *ready, rtx insn, bool first_p)
HAIFA_INLINE static void
advance_one_cycle (void)
{
+ if (targetm.sched.dfa_pre_advance_cycle)
+ targetm.sched.dfa_pre_advance_cycle ();
+
if (targetm.sched.dfa_pre_cycle_insn)
state_transition (curr_state,
targetm.sched.dfa_pre_cycle_insn ());
if (targetm.sched.dfa_post_cycle_insn)
state_transition (curr_state,
targetm.sched.dfa_post_cycle_insn ());
+
+ if (targetm.sched.dfa_post_advance_cycle)
+ targetm.sched.dfa_post_advance_cycle ();
}
/* Clock at which the previous instruction was issued. */
static int
schedule_insn (rtx insn)
{
- rtx link;
+ sd_iterator_def sd_it;
+ dep_t dep;
int advance = 0;
if (sched_verbose >= 1)
/* Scheduling instruction should have all its dependencies resolved and
should have been removed from the ready list. */
- gcc_assert (INSN_DEP_COUNT (insn) == 0);
- gcc_assert (!LOG_LINKS (insn));
- gcc_assert (QUEUE_INDEX (insn) == QUEUE_NOWHERE);
+ gcc_assert (sd_lists_empty_p (insn, SD_LIST_BACK));
+ gcc_assert (QUEUE_INDEX (insn) == QUEUE_NOWHERE);
QUEUE_INDEX (insn) = QUEUE_SCHEDULED;
-
- /* Now we can free RESOLVED_DEPS list. */
- if (current_sched_info->flags & USE_DEPS_LIST)
- free_DEPS_LIST_list (&RESOLVED_DEPS (insn));
- else
- free_INSN_LIST_list (&RESOLVED_DEPS (insn));
-
+
gcc_assert (INSN_TICK (insn) >= MIN_TICK);
if (INSN_TICK (insn) > clock_var)
/* INSN has been prematurely moved from the queue to the ready list.
INSN_TICK (insn) = clock_var;
/* Update dependent instructions. */
- for (link = INSN_DEPEND (insn); link; link = XEXP (link, 1))
+ for (sd_it = sd_iterator_start (insn, SD_LIST_FORW);
+ sd_iterator_cond (&sd_it, &dep);)
{
- int effective_cost;
- rtx next = XEXP (link, 0);
+ rtx next = DEP_CON (dep);
- resolve_dep (next, insn);
+ /* Resolve the dependence between INSN and NEXT.
+ sd_resolve_dep () moves current dep to another list thus
+ advancing the iterator. */
+ sd_resolve_dep (sd_it);
- effective_cost = try_ready (next);
-
- if (effective_cost >= 0
- && SCHED_GROUP_P (next)
- && advance < effective_cost)
- advance = effective_cost;
+ if (!IS_SPECULATION_BRANCHY_CHECK_P (insn))
+ {
+ int effective_cost;
+
+ effective_cost = try_ready (next);
+
+ if (effective_cost >= 0
+ && SCHED_GROUP_P (next)
+ && advance < effective_cost)
+ advance = effective_cost;
+ }
+ else
+ /* Check always has only one forward dependence (to the first insn in
+ the recovery block), therefore, this will be executed only once. */
+ {
+ gcc_assert (sd_lists_empty_p (insn, SD_LIST_FORW));
+ fix_recovery_deps (RECOVERY_BLOCK (insn));
+ }
}
+ /* This is the place where scheduler doesn't *basically* need backward and
+ forward dependencies for INSN anymore. Nevertheless they are used in
+ heuristics in rank_for_schedule (), early_queue_to_ready () and in
+ some targets (e.g. rs6000). Thus the earliest place where we *can*
+ remove dependencies is after targetm.sched.md_finish () call in
+ schedule_block (). But, on the other side, the safest place to remove
+ dependencies is when we are finishing scheduling entire region. As we
+ don't generate [many] dependencies during scheduling itself, we won't
+ need memory until beginning of next region.
+ Bottom line: Dependencies are removed for all insns in the end of
+ scheduling the region. */
+
/* Annotate the instruction with issue information -- TImode
indicates that the instruction is expected not to be able
to issue on the same cycle as the previous insn. A machine
{
rtx prev = PREV_INSN (insn);
- while (insn != tail && NOTE_P (insn))
+ while (insn != tail && NOTE_NOT_BB_P (insn))
{
rtx next = NEXT_INSN (insn);
+ basic_block bb = BLOCK_FOR_INSN (insn);
+
/* Delete the note from its current position. */
if (prev)
NEXT_INSN (prev) = next;
if (next)
PREV_INSN (next) = prev;
+ if (bb)
+ {
+ /* Basic block can begin with either LABEL or
+ NOTE_INSN_BASIC_BLOCK. */
+ gcc_assert (BB_HEAD (bb) != insn);
+
+ /* Check if we are removing last insn in the BB. */
+ if (BB_END (bb) == insn)
+ BB_END (bb) = prev;
+ }
+
/* See sched_analyze to see how these are handled. */
- if (NOTE_LINE_NUMBER (insn) != NOTE_INSN_BASIC_BLOCK
- && NOTE_LINE_NUMBER (insn) != NOTE_INSN_EH_REGION_BEG
- && NOTE_LINE_NUMBER (insn) != NOTE_INSN_EH_REGION_END)
+ if (NOTE_KIND (insn) != NOTE_INSN_EH_REGION_BEG
+ && NOTE_KIND (insn) != NOTE_INSN_EH_REGION_END)
{
/* Insert the note at the end of the notes list. */
PREV_INSN (insn) = note_list;
return insn;
}
-/* Delete line notes beginning with INSN. Record line-number notes so
- they can be reused. Returns the insn following the notes. */
+/* Return the head and tail pointers of ebb starting at BEG and ending
+ at END. */
-static rtx
-unlink_line_notes (rtx insn, rtx tail)
+void
+get_ebb_head_tail (basic_block beg, basic_block end, rtx *headp, rtx *tailp)
{
- rtx prev = PREV_INSN (insn);
+ rtx beg_head = BB_HEAD (beg);
+ rtx beg_tail = BB_END (beg);
+ rtx end_head = BB_HEAD (end);
+ rtx end_tail = BB_END (end);
- while (insn != tail && NOTE_P (insn))
- {
- rtx next = NEXT_INSN (insn);
+ /* Don't include any notes or labels at the beginning of the BEG
+ basic block, or notes at the end of the END basic blocks. */
- if (write_symbols != NO_DEBUG && NOTE_LINE_NUMBER (insn) > 0)
- {
- /* Delete the note from its current position. */
- if (prev)
- NEXT_INSN (prev) = next;
- if (next)
- PREV_INSN (next) = prev;
-
- /* Record line-number notes so they can be reused. */
- LINE_NOTE (insn) = insn;
- }
- else
- prev = insn;
+ if (LABEL_P (beg_head))
+ beg_head = NEXT_INSN (beg_head);
- insn = next;
- }
- return insn;
-}
+ while (beg_head != beg_tail)
+ if (NOTE_P (beg_head))
+ beg_head = NEXT_INSN (beg_head);
+ else
+ break;
-/* Return the head and tail pointers of BB. */
+ *headp = beg_head;
-void
-get_block_head_tail (int b, rtx *headp, rtx *tailp)
-{
- /* HEAD and TAIL delimit the basic block being scheduled. */
- rtx head = BB_HEAD (BASIC_BLOCK (b));
- rtx tail = BB_END (BASIC_BLOCK (b));
-
- /* Don't include any notes or labels at the beginning of the
- basic block, or notes at the ends of basic blocks. */
- while (head != tail)
- {
- if (NOTE_P (head))
- head = NEXT_INSN (head);
- else if (NOTE_P (tail))
- tail = PREV_INSN (tail);
- else if (LABEL_P (head))
- head = NEXT_INSN (head);
- else
- break;
- }
+ if (beg == end)
+ end_head = beg_head;
+ else if (LABEL_P (end_head))
+ end_head = NEXT_INSN (end_head);
+
+ while (end_head != end_tail)
+ if (NOTE_P (end_tail))
+ end_tail = PREV_INSN (end_tail);
+ else
+ break;
- *headp = head;
- *tailp = tail;
+ *tailp = end_tail;
}
/* Return nonzero if there are no real insns in the range [ HEAD, TAIL ]. */
int
-no_real_insns_p (rtx head, rtx tail)
+no_real_insns_p (const_rtx head, const_rtx tail)
{
while (head != NEXT_INSN (tail))
{
return 1;
}
-/* Delete line notes from one block. Save them so they can be later restored
- (in restore_line_notes). HEAD and TAIL are the boundaries of the
- block in which notes should be processed. */
-
-void
-rm_line_notes (rtx head, rtx tail)
-{
- rtx next_tail;
- rtx insn;
-
- next_tail = NEXT_INSN (tail);
- for (insn = head; insn != next_tail; insn = NEXT_INSN (insn))
- {
- rtx prev;
-
- /* Farm out notes, and maybe save them in NOTE_LIST.
- This is needed to keep the debugger from
- getting completely deranged. */
- if (NOTE_P (insn))
- {
- prev = insn;
- insn = unlink_line_notes (insn, next_tail);
-
- gcc_assert (prev != tail && prev != head && insn != next_tail);
- }
- }
-}
-
-/* Save line number notes for each insn in block B. HEAD and TAIL are
- the boundaries of the block in which notes should be processed. */
-
-void
-save_line_notes (int b, rtx head, rtx tail)
-{
- rtx next_tail;
-
- /* We must use the true line number for the first insn in the block
- that was computed and saved at the start of this pass. We can't
- use the current line number, because scheduling of the previous
- block may have changed the current line number. */
-
- rtx line = line_note_head[b];
- rtx insn;
-
- next_tail = NEXT_INSN (tail);
-
- for (insn = head; insn != next_tail; insn = NEXT_INSN (insn))
- if (NOTE_P (insn) && NOTE_LINE_NUMBER (insn) > 0)
- line = insn;
- else
- LINE_NOTE (insn) = line;
-}
-
-/* After a block was scheduled, insert line notes into the insns list.
- HEAD and TAIL are the boundaries of the block in which notes should
- be processed. */
-
-void
-restore_line_notes (rtx head, rtx tail)
-{
- rtx line, note, prev, new;
- int added_notes = 0;
- rtx next_tail, insn;
-
- head = head;
- next_tail = NEXT_INSN (tail);
-
- /* Determine the current line-number. We want to know the current
- line number of the first insn of the block here, in case it is
- different from the true line number that was saved earlier. If
- different, then we need a line number note before the first insn
- of this block. If it happens to be the same, then we don't want to
- emit another line number note here. */
- for (line = head; line; line = PREV_INSN (line))
- if (NOTE_P (line) && NOTE_LINE_NUMBER (line) > 0)
- break;
-
- /* Walk the insns keeping track of the current line-number and inserting
- the line-number notes as needed. */
- for (insn = head; insn != next_tail; insn = NEXT_INSN (insn))
- if (NOTE_P (insn) && NOTE_LINE_NUMBER (insn) > 0)
- line = insn;
- /* This used to emit line number notes before every non-deleted note.
- However, this confuses a debugger, because line notes not separated
- by real instructions all end up at the same address. I can find no
- use for line number notes before other notes, so none are emitted. */
- else if (!NOTE_P (insn)
- && INSN_UID (insn) < old_max_uid
- && (note = LINE_NOTE (insn)) != 0
- && note != line
- && (line == 0
-#ifdef USE_MAPPED_LOCATION
- || NOTE_SOURCE_LOCATION (note) != NOTE_SOURCE_LOCATION (line)
-#else
- || NOTE_LINE_NUMBER (note) != NOTE_LINE_NUMBER (line)
- || NOTE_SOURCE_FILE (note) != NOTE_SOURCE_FILE (line)
-#endif
- ))
- {
- line = note;
- prev = PREV_INSN (insn);
- if (LINE_NOTE (note))
- {
- /* Re-use the original line-number note. */
- LINE_NOTE (note) = 0;
- PREV_INSN (note) = prev;
- NEXT_INSN (prev) = note;
- PREV_INSN (insn) = note;
- NEXT_INSN (note) = insn;
- }
- else
- {
- added_notes++;
- new = emit_note_after (NOTE_LINE_NUMBER (note), prev);
-#ifndef USE_MAPPED_LOCATION
- NOTE_SOURCE_FILE (new) = NOTE_SOURCE_FILE (note);
-#endif
- }
- }
- if (sched_verbose && added_notes)
- fprintf (sched_dump, ";; added %d line-number notes\n", added_notes);
-}
-
-/* After scheduling the function, delete redundant line notes from the
- insns list. */
-
-void
-rm_redundant_line_notes (void)
-{
- rtx line = 0;
- rtx insn = get_insns ();
- int active_insn = 0;
- int notes = 0;
-
- /* Walk the insns deleting redundant line-number notes. Many of these
- are already present. The remainder tend to occur at basic
- block boundaries. */
- for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
- if (NOTE_P (insn) && NOTE_LINE_NUMBER (insn) > 0)
- {
- /* If there are no active insns following, INSN is redundant. */
- if (active_insn == 0)
- {
- notes++;
- SET_INSN_DELETED (insn);
- }
- /* If the line number is unchanged, LINE is redundant. */
- else if (line
-#ifdef USE_MAPPED_LOCATION
- && NOTE_SOURCE_LOCATION (line) == NOTE_SOURCE_LOCATION (insn)
-#else
- && NOTE_LINE_NUMBER (line) == NOTE_LINE_NUMBER (insn)
- && NOTE_SOURCE_FILE (line) == NOTE_SOURCE_FILE (insn)
-#endif
-)
- {
- notes++;
- SET_INSN_DELETED (line);
- line = insn;
- }
- else
- line = insn;
- active_insn = 0;
- }
- else if (!((NOTE_P (insn)
- && NOTE_LINE_NUMBER (insn) == NOTE_INSN_DELETED)
- || (NONJUMP_INSN_P (insn)
- && (GET_CODE (PATTERN (insn)) == USE
- || GET_CODE (PATTERN (insn)) == CLOBBER))))
- active_insn++;
-
- if (sched_verbose && notes)
- fprintf (sched_dump, ";; deleted %d line-number notes\n", notes);
-}
-
/* Delete notes between HEAD and TAIL and put them in the chain
of notes ended by NOTE_LIST. */
/* Farm out notes, and maybe save them in NOTE_LIST.
This is needed to keep the debugger from
getting completely deranged. */
- if (NOTE_P (insn))
+ if (NOTE_NOT_BB_P (insn))
{
prev = insn;
a new register is not needed. */
static int
-find_set_reg_weight (rtx x)
+find_set_reg_weight (const_rtx x)
{
if (GET_CODE (x) == CLOBBER
&& register_operand (SET_DEST (x), VOIDmode))
/* Calculate INSN_REG_WEIGHT for all insns of a block. */
static void
-find_insn_reg_weight (int b)
+find_insn_reg_weight (basic_block bb)
{
rtx insn, next_tail, head, tail;
- get_block_head_tail (b, &head, &tail);
+ get_ebb_head_tail (bb, bb, &head, &tail);
next_tail = NEXT_INSN (tail);
for (insn = head; insn != next_tail; insn = NEXT_INSN (insn))
- {
- int reg_weight = 0;
- rtx x;
-
- /* Handle register life information. */
- if (! INSN_P (insn))
- continue;
+ find_insn_reg_weight1 (insn);
+}
- /* Increment weight for each register born here. */
- x = PATTERN (insn);
- reg_weight += find_set_reg_weight (x);
- if (GET_CODE (x) == PARALLEL)
- {
- int j;
- for (j = XVECLEN (x, 0) - 1; j >= 0; j--)
- {
- x = XVECEXP (PATTERN (insn), 0, j);
- reg_weight += find_set_reg_weight (x);
- }
- }
- /* Decrement weight for each register that dies here. */
- for (x = REG_NOTES (insn); x; x = XEXP (x, 1))
+/* Calculate INSN_REG_WEIGHT for single instruction.
+ Separated from find_insn_reg_weight because of need
+ to initialize new instruction in generate_recovery_code. */
+static void
+find_insn_reg_weight1 (rtx insn)
+{
+ int reg_weight = 0;
+ rtx x;
+
+ /* Handle register life information. */
+ if (! INSN_P (insn))
+ return;
+
+ /* Increment weight for each register born here. */
+ x = PATTERN (insn);
+ reg_weight += find_set_reg_weight (x);
+ if (GET_CODE (x) == PARALLEL)
+ {
+ int j;
+ for (j = XVECLEN (x, 0) - 1; j >= 0; j--)
{
- if (REG_NOTE_KIND (x) == REG_DEAD
- || REG_NOTE_KIND (x) == REG_UNUSED)
- reg_weight--;
+ x = XVECEXP (PATTERN (insn), 0, j);
+ reg_weight += find_set_reg_weight (x);
}
-
- INSN_REG_WEIGHT (insn) = reg_weight;
}
+ /* Decrement weight for each register that dies here. */
+ for (x = REG_NOTES (insn); x; x = XEXP (x, 1))
+ {
+ if (REG_NOTE_KIND (x) == REG_DEAD
+ || REG_NOTE_KIND (x) == REG_UNUSED)
+ reg_weight--;
+ }
+
+ INSN_REG_WEIGHT (insn) = reg_weight;
}
/* Move insns that became ready to fire from queue to ready list. */
{
rtx insn;
rtx link;
+ rtx skip_insn;
q_ptr = NEXT_Q (q_ptr);
+ if (dbg_cnt (sched_insn) == false)
+ /* If debug counter is activated do not requeue insn next after
+ last_scheduled_insn. */
+ skip_insn = next_nonnote_insn (last_scheduled_insn);
+ else
+ skip_insn = NULL_RTX;
+
/* Add all pending insns that can be scheduled without stalls to the
ready list. */
for (link = insn_queue[q_ptr]; link; link = XEXP (link, 1))
fprintf (sched_dump, ";;\t\tQ-->Ready: insn %s: ",
(*current_sched_info->print_insn) (insn, 0));
- ready_add (ready, insn, false);
- if (sched_verbose >= 2)
- fprintf (sched_dump, "moving to ready without stalls\n");
+ /* If the ready list is full, delay the insn for 1 cycle.
+ See the comment in schedule_block for the rationale. */
+ if (!reload_completed
+ && ready->n_ready > MAX_SCHED_READY_INSNS
+ && !SCHED_GROUP_P (insn)
+ && insn != skip_insn)
+ {
+ if (sched_verbose >= 2)
+ fprintf (sched_dump, "requeued because ready full\n");
+ queue_insn (insn, 1);
+ }
+ else
+ {
+ ready_add (ready, insn, false);
+ if (sched_verbose >= 2)
+ fprintf (sched_dump, "moving to ready without stalls\n");
+ }
}
free_INSN_LIST_list (&insn_queue[q_ptr]);
{
for ( ; prev_insn; prev_insn = PREV_INSN (prev_insn))
{
- rtx dep_link = 0;
- int dep_cost;
+ int cost;
+
+ if (prev_insn == current_sched_info->prev_head)
+ {
+ prev_insn = NULL;
+ break;
+ }
if (!NOTE_P (prev_insn))
{
- dep_link = find_insn_list (insn, INSN_DEPEND (prev_insn));
- if (dep_link)
+ dep_t dep;
+
+ dep = sd_find_dep_between (prev_insn, insn, true);
+
+ if (dep != NULL)
{
- dep_cost = insn_cost (prev_insn, dep_link, insn) ;
- if (targetm.sched.is_costly_dependence (prev_insn, insn,
- dep_link, dep_cost,
+ cost = dep_cost (dep);
+
+ if (targetm.sched.is_costly_dependence (dep, cost,
flag_sched_stalled_insns_dep - n_cycles))
return false;
}
fprintf (sched_dump, "\n");
}
-/* move_insn1: Remove INSN from insn chain, and link it after LAST insn. */
-
-static rtx
-move_insn1 (rtx insn, rtx last)
-{
- NEXT_INSN (PREV_INSN (insn)) = NEXT_INSN (insn);
- PREV_INSN (NEXT_INSN (insn)) = PREV_INSN (insn);
-
- NEXT_INSN (insn) = NEXT_INSN (last);
- PREV_INSN (NEXT_INSN (last)) = insn;
-
- NEXT_INSN (last) = insn;
- PREV_INSN (insn) = last;
-
- return insn;
-}
-
/* Search INSN for REG_SAVE_NOTE note pairs for
NOTE_INSN_EHREGION_{BEG,END}; and convert them back into
NOTEs. The REG_SAVE_NOTE note following first one is contains the
saved value for NOTE_BLOCK_NUMBER which is useful for
- NOTE_INSN_EH_REGION_{BEG,END} NOTEs. LAST is the last instruction
- output by the instruction scheduler. Return the new value of LAST. */
+ NOTE_INSN_EH_REGION_{BEG,END} NOTEs. */
-static rtx
-reemit_notes (rtx insn, rtx last)
+static void
+reemit_notes (rtx insn)
{
- rtx note, retval;
+ rtx note, last = insn;
- retval = last;
for (note = REG_NOTES (insn); note; note = XEXP (note, 1))
{
if (REG_NOTE_KIND (note) == REG_SAVE_NOTE)
remove_note (insn, note);
}
}
- return retval;
}
-/* Move INSN. Reemit notes if needed.
-
- Return the last insn emitted by the scheduler, which is the
- return value from the first call to reemit_notes. */
-
-static rtx
-move_insn (rtx insn, rtx last)
+/* Move INSN. Reemit notes if needed. Update CFG, if needed. */
+static void
+move_insn (rtx insn)
{
- rtx retval = NULL;
+ rtx last = last_scheduled_insn;
- move_insn1 (insn, last);
+ if (PREV_INSN (insn) != last)
+ {
+ basic_block bb;
+ rtx note;
+ int jump_p = 0;
- /* If this is the first call to reemit_notes, then record
- its return value. */
- if (retval == NULL_RTX)
- retval = reemit_notes (insn, insn);
- else
- reemit_notes (insn, insn);
+ bb = BLOCK_FOR_INSN (insn);
+
+ /* BB_HEAD is either LABEL or NOTE. */
+ gcc_assert (BB_HEAD (bb) != insn);
+
+ if (BB_END (bb) == insn)
+ /* If this is last instruction in BB, move end marker one
+ instruction up. */
+ {
+ /* Jumps are always placed at the end of basic block. */
+ jump_p = control_flow_insn_p (insn);
+
+ gcc_assert (!jump_p
+ || ((current_sched_info->flags & SCHED_RGN)
+ && IS_SPECULATION_BRANCHY_CHECK_P (insn))
+ || (current_sched_info->flags & SCHED_EBB));
+
+ gcc_assert (BLOCK_FOR_INSN (PREV_INSN (insn)) == bb);
+
+ BB_END (bb) = PREV_INSN (insn);
+ }
+
+ gcc_assert (BB_END (bb) != last);
+
+ if (jump_p)
+ /* We move the block note along with jump. */
+ {
+ /* NT is needed for assertion below. */
+ rtx nt = current_sched_info->next_tail;
+
+ note = NEXT_INSN (insn);
+ while (NOTE_NOT_BB_P (note) && note != nt)
+ note = NEXT_INSN (note);
+
+ if (note != nt
+ && (LABEL_P (note)
+ || BARRIER_P (note)))
+ note = NEXT_INSN (note);
+
+ gcc_assert (NOTE_INSN_BASIC_BLOCK_P (note));
+ }
+ else
+ note = insn;
- SCHED_GROUP_P (insn) = 0;
+ NEXT_INSN (PREV_INSN (insn)) = NEXT_INSN (note);
+ PREV_INSN (NEXT_INSN (note)) = PREV_INSN (insn);
- return retval;
+ NEXT_INSN (note) = NEXT_INSN (last);
+ PREV_INSN (NEXT_INSN (last)) = note;
+
+ NEXT_INSN (last) = insn;
+ PREV_INSN (insn) = last;
+
+ bb = BLOCK_FOR_INSN (last);
+
+ if (jump_p)
+ {
+ fix_jump_move (insn);
+
+ if (BLOCK_FOR_INSN (insn) != bb)
+ move_block_after_check (insn);
+
+ gcc_assert (BB_END (bb) == last);
+ }
+
+ df_insn_change_bb (insn, bb);
+
+ /* Update BB_END, if needed. */
+ if (BB_END (bb) == last)
+ BB_END (bb) = insn;
+ }
+
+ reemit_notes (insn);
+
+ SCHED_GROUP_P (insn) = 0;
}
/* The following structure describe an entry of the stack of choices. */
insns is insns with the best rank (the first insn in READY). To
make this function tries different samples of ready insns. READY
is current queue `ready'. Global array READY_TRY reflects what
- insns are already issued in this try. INDEX will contain index
- of the best insn in READY. The following function is used only for
- first cycle multipass scheduling. */
+ insns are already issued in this try. MAX_POINTS is the sum of points
+ of all instructions in READY. The function stops immediately,
+ if it reached the such a solution, that all instruction can be issued.
+ INDEX will contain index of the best insn in READY. The following
+ function is used only for first cycle multipass scheduling. */
static int
-max_issue (struct ready_list *ready, int *index)
+max_issue (struct ready_list *ready, int *index, int max_points)
{
- int n, i, all, n_ready, best, delay, tries_num;
+ int n, i, all, n_ready, best, delay, tries_num, points = -1;
struct choice_entry *top;
rtx insn;
{
best = top - choice_stack;
*index = choice_stack [1].index;
- if (top->n == issue_rate - cycle_issued_insns || best == all)
+ points = top->n;
+ if (top->n == max_points || best == all)
break;
}
i = top->index;
top->rest--;
n = top->n;
if (memcmp (top->state, curr_state, dfa_state_size) != 0)
- n++;
+ n += ISSUE_POINTS (insn);
top++;
top->rest = cached_first_cycle_multipass_dfa_lookahead;
top->index = i;
ready_try [top->index] = 0;
top--;
}
- memcpy (curr_state, choice_stack->state, dfa_state_size);
+ memcpy (curr_state, choice_stack->state, dfa_state_size);
+
+ if (sched_verbose >= 4)
+ fprintf (sched_dump, ";;\t\tChoosed insn : %s; points: %d/%d\n",
+ (*current_sched_info->print_insn) (ready_element (ready, *index),
+ 0),
+ points, max_points);
+
return best;
}
/* The following function chooses insn from READY and modifies
*N_READY and READY. The following function is used only for first
- cycle multipass scheduling. */
-
-static rtx
-choose_ready (struct ready_list *ready)
+ cycle multipass scheduling.
+ Return:
+ -1 if cycle should be advanced,
+ 0 if INSN_PTR is set to point to the desirable insn,
+ 1 if choose_ready () should be restarted without advancing the cycle. */
+static int
+choose_ready (struct ready_list *ready, rtx *insn_ptr)
{
- int lookahead = 0;
+ int lookahead;
+
+ if (dbg_cnt (sched_insn) == false)
+ {
+ rtx insn;
+
+ insn = next_nonnote_insn (last_scheduled_insn);
+
+ if (QUEUE_INDEX (insn) == QUEUE_READY)
+ /* INSN is in the ready_list. */
+ {
+ ready_remove_insn (insn);
+ *insn_ptr = insn;
+ return 0;
+ }
+
+ /* INSN is in the queue. Advance cycle to move it to the ready list. */
+ return -1;
+ }
+
+ lookahead = 0;
if (targetm.sched.first_cycle_multipass_dfa_lookahead)
lookahead = targetm.sched.first_cycle_multipass_dfa_lookahead ();
if (lookahead <= 0 || SCHED_GROUP_P (ready_element (ready, 0)))
- return ready_remove_first (ready);
+ {
+ *insn_ptr = ready_remove_first (ready);
+ return 0;
+ }
else
{
/* Try to choose the better insn. */
- int index = 0, i;
+ int index = 0, i, n;
rtx insn;
-
+ int more_issue, max_points, try_data = 1, try_control = 1;
+
if (cached_first_cycle_multipass_dfa_lookahead != lookahead)
{
cached_first_cycle_multipass_dfa_lookahead = lookahead;
}
insn = ready_element (ready, 0);
if (INSN_CODE (insn) < 0)
- return ready_remove_first (ready);
+ {
+ *insn_ptr = ready_remove_first (ready);
+ return 0;
+ }
+
+ if (spec_info
+ && spec_info->flags & (PREFER_NON_DATA_SPEC
+ | PREFER_NON_CONTROL_SPEC))
+ {
+ for (i = 0, n = ready->n_ready; i < n; i++)
+ {
+ rtx x;
+ ds_t s;
+
+ x = ready_element (ready, i);
+ s = TODO_SPEC (x);
+
+ if (spec_info->flags & PREFER_NON_DATA_SPEC
+ && !(s & DATA_SPEC))
+ {
+ try_data = 0;
+ if (!(spec_info->flags & PREFER_NON_CONTROL_SPEC)
+ || !try_control)
+ break;
+ }
+
+ if (spec_info->flags & PREFER_NON_CONTROL_SPEC
+ && !(s & CONTROL_SPEC))
+ {
+ try_control = 0;
+ if (!(spec_info->flags & PREFER_NON_DATA_SPEC) || !try_data)
+ break;
+ }
+ }
+ }
+
+ if ((!try_data && (TODO_SPEC (insn) & DATA_SPEC))
+ || (!try_control && (TODO_SPEC (insn) & CONTROL_SPEC))
+ || (targetm.sched.first_cycle_multipass_dfa_lookahead_guard_spec
+ && !targetm.sched.first_cycle_multipass_dfa_lookahead_guard_spec
+ (insn)))
+ /* Discard speculative instruction that stands first in the ready
+ list. */
+ {
+ change_queue_index (insn, 1);
+ return 1;
+ }
+
+ max_points = ISSUE_POINTS (insn);
+ more_issue = issue_rate - cycle_issued_insns - 1;
+
for (i = 1; i < ready->n_ready; i++)
{
insn = ready_element (ready, i);
ready_try [i]
= (INSN_CODE (insn) < 0
+ || (!try_data && (TODO_SPEC (insn) & DATA_SPEC))
+ || (!try_control && (TODO_SPEC (insn) & CONTROL_SPEC))
|| (targetm.sched.first_cycle_multipass_dfa_lookahead_guard
- && !targetm.sched.first_cycle_multipass_dfa_lookahead_guard (insn)));
+ && !targetm.sched.first_cycle_multipass_dfa_lookahead_guard
+ (insn)));
+
+ if (!ready_try [i] && more_issue-- > 0)
+ max_points += ISSUE_POINTS (insn);
+ }
+
+ if (max_issue (ready, &index, max_points) == 0)
+ {
+ *insn_ptr = ready_remove_first (ready);
+ return 0;
}
- if (max_issue (ready, &index) == 0)
- return ready_remove_first (ready);
else
- return ready_remove (ready, index);
+ {
+ *insn_ptr = ready_remove (ready, index);
+ return 0;
+ }
}
}
-/* Use forward list scheduling to rearrange insns of block B in region RGN,
- possibly bringing insns from subsequent blocks in the same region. */
+/* Use forward list scheduling to rearrange insns of block pointed to by
+ TARGET_BB, possibly bringing insns from subsequent blocks in the same
+ region. */
void
-schedule_block (int b, int rgn_n_insns)
+schedule_block (basic_block *target_bb, int rgn_n_insns1)
{
struct ready_list ready;
int i, first_cycle_insn_p;
gcc_assert (head != tail || INSN_P (head));
+ haifa_recovery_bb_recently_added_p = false;
+
/* Debug info. */
if (sched_verbose)
- {
- fprintf (sched_dump,
- ";; ======================================================\n");
- fprintf (sched_dump,
- ";; -- basic block %d from %d to %d -- %s reload\n",
- b, INSN_UID (head), INSN_UID (tail),
- (reload_completed ? "after" : "before"));
- fprintf (sched_dump,
- ";; ======================================================\n");
- fprintf (sched_dump, "\n");
- }
+ dump_new_block_header (0, *target_bb, head, tail);
state_reset (curr_state);
/* Allocate the ready list. */
readyp = &ready;
- ready.veclen = rgn_n_insns + 1 + issue_rate;
+ ready.vec = NULL;
+ ready_try = NULL;
+ choice_stack = NULL;
+
+ rgn_n_insns = -1;
+ extend_ready (rgn_n_insns1 + 1);
+
ready.first = ready.veclen - 1;
- ready.vec = XNEWVEC (rtx, ready.veclen);
ready.n_ready = 0;
/* It is used for first cycle multipass scheduling. */
temp_state = alloca (dfa_state_size);
- ready_try = XCNEWVEC (char, rgn_n_insns + 1);
- choice_stack = XNEWVEC (struct choice_entry, rgn_n_insns + 1);
- for (i = 0; i <= rgn_n_insns; i++)
- choice_stack[i].state = xmalloc (dfa_state_size);
if (targetm.sched.md_init)
targetm.sched.md_init (sched_dump, sched_verbose, ready.veclen);
/* We start inserting insns after PREV_HEAD. */
last_scheduled_insn = prev_head;
+ gcc_assert (NOTE_P (last_scheduled_insn)
+ && BLOCK_FOR_INSN (last_scheduled_insn) == *target_bb);
+
/* Initialize INSN_QUEUE. Q_SIZE is the total number of insns in the
queue. */
q_ptr = 0;
in try_ready () (which is called through init_ready_list ()). */
(*current_sched_info->init_ready_list) ();
+ /* The algorithm is O(n^2) in the number of ready insns at any given
+ time in the worst case. Before reload we are more likely to have
+ big lists so truncate them to a reasonable size. */
+ if (!reload_completed && ready.n_ready > MAX_SCHED_READY_INSNS)
+ {
+ ready_sort (&ready);
+
+ /* Find first free-standing insn past MAX_SCHED_READY_INSNS. */
+ for (i = MAX_SCHED_READY_INSNS; i < ready.n_ready; i++)
+ if (!SCHED_GROUP_P (ready_element (&ready, i)))
+ break;
+
+ if (sched_verbose >= 2)
+ {
+ fprintf (sched_dump,
+ ";;\t\tReady list on entry: %d insns\n", ready.n_ready);
+ fprintf (sched_dump,
+ ";;\t\t before reload => truncated to %d insns\n", i);
+ }
+
+ /* Delay all insns past it for 1 cycle. If debug counter is
+ activated make an exception for the insn right after
+ last_scheduled_insn. */
+ {
+ rtx skip_insn;
+
+ if (dbg_cnt (sched_insn) == false)
+ skip_insn = next_nonnote_insn (last_scheduled_insn);
+ else
+ skip_insn = NULL_RTX;
+
+ while (i < ready.n_ready)
+ {
+ rtx insn;
+
+ insn = ready_remove (&ready, i);
+
+ if (insn != skip_insn)
+ queue_insn (insn, 1);
+ }
+ }
+ }
+
+ /* Now we can restore basic block notes and maintain precise cfg. */
+ restore_bb_notes (*target_bb);
+
last_clock_var = -1;
advance = 0;
if (sched_verbose >= 2)
{
- fprintf (sched_dump, ";;\tReady list (t =%3d): ",
+ fprintf (sched_dump, ";;\tReady list (t = %3d): ",
clock_var);
debug_ready_list (&ready);
}
there's nothing better to do (ready list is empty) but
there are still vacant dispatch slots in the current cycle. */
if (sched_verbose >= 6)
- fprintf(sched_dump,";;\t\tSecond chance\n");
+ fprintf (sched_dump,";;\t\tSecond chance\n");
memcpy (temp_state, curr_state, dfa_state_size);
if (early_queue_to_ready (temp_state, &ready))
ready_sort (&ready);
/* Select and remove the insn from the ready list. */
if (sort_p)
- insn = choose_ready (&ready);
+ {
+ int res;
+
+ insn = NULL_RTX;
+ res = choose_ready (&ready, &insn);
+
+ if (res < 0)
+ /* Finish cycle. */
+ break;
+ if (res > 0)
+ /* Restart choose_ready (). */
+ continue;
+
+ gcc_assert (insn != NULL_RTX);
+ }
else
insn = ready_remove_first (&ready);
continue;
}
- if (! (*current_sched_info->can_schedule_ready_p) (insn))
- goto next;
+ if (current_sched_info->can_schedule_ready_p
+ && ! (*current_sched_info->can_schedule_ready_p) (insn))
+ /* We normally get here only if we don't want to move
+ insn from the split block. */
+ {
+ TODO_SPEC (insn) = (TODO_SPEC (insn) & ~SPECULATIVE) | HARD_DEP;
+ continue;
+ }
+
+ /* DECISION is made. */
+
+ if (TODO_SPEC (insn) & SPECULATIVE)
+ generate_recovery_code (insn);
+
+ if (control_flow_insn_p (last_scheduled_insn)
+ /* This is used to switch basic blocks by request
+ from scheduler front-end (actually, sched-ebb.c only).
+ This is used to process blocks with single fallthru
+ edge. If succeeding block has jump, it [jump] will try
+ move at the end of current bb, thus corrupting CFG. */
+ || current_sched_info->advance_target_bb (*target_bb, insn))
+ {
+ *target_bb = current_sched_info->advance_target_bb
+ (*target_bb, 0);
+
+ if (sched_verbose)
+ {
+ rtx x;
- last_scheduled_insn = move_insn (insn, last_scheduled_insn);
+ x = next_real_insn (last_scheduled_insn);
+ gcc_assert (x);
+ dump_new_block_header (1, *target_bb, x, tail);
+ }
+ last_scheduled_insn = bb_note (*target_bb);
+ }
+
+ /* Update counters, etc in the scheduler's front end. */
+ (*current_sched_info->begin_schedule_ready) (insn,
+ last_scheduled_insn);
+
+ move_insn (insn);
+ last_scheduled_insn = insn;
+
if (memcmp (curr_state, temp_state, dfa_state_size) != 0)
{
cycle_issued_insns++;
if (advance != 0)
break;
- next:
first_cycle_insn_p = 0;
/* Sort the ready list based on priority. This must be
{
/* We must maintain QUEUE_INDEX between blocks in region. */
for (i = ready.n_ready - 1; i >= 0; i--)
- QUEUE_INDEX (ready_element (&ready, i)) = QUEUE_NOWHERE;
+ {
+ rtx x;
+
+ x = ready_element (&ready, i);
+ QUEUE_INDEX (x) = QUEUE_NOWHERE;
+ TODO_SPEC (x) = (TODO_SPEC (x) & ~SPECULATIVE) | HARD_DEP;
+ }
if (q_size)
for (i = 0; i <= max_insn_queue_index; i++)
{
rtx link;
for (link = insn_queue[i]; link; link = XEXP (link, 1))
- QUEUE_INDEX (XEXP (link, 0)) = QUEUE_NOWHERE;
+ {
+ rtx x;
+
+ x = XEXP (link, 0);
+ QUEUE_INDEX (x) = QUEUE_NOWHERE;
+ TODO_SPEC (x) = (TODO_SPEC (x) & ~SPECULATIVE) | HARD_DEP;
+ }
free_INSN_LIST_list (&insn_queue[i]);
}
+ }
+ if (!current_sched_info->queue_must_finish_empty
+ || haifa_recovery_bb_recently_added_p)
+ {
/* INSN_TICK (minimum clock tick at which the insn becomes
ready) may be not correct for the insn in the subsequent
blocks of the region. We should use a correct value of
}
if (targetm.sched.md_finish)
- targetm.sched.md_finish (sched_dump, sched_verbose);
+ {
+ targetm.sched.md_finish (sched_dump, sched_verbose);
+
+ /* Target might have added some instructions to the scheduled block.
+ in its md_finish () hook. These new insns don't have any data
+ initialized and to identify them we extend h_i_d so that they'll
+ get zero luids.*/
+ extend_h_i_d ();
+ }
/* Update head/tail boundaries. */
head = NEXT_INSN (prev_head);
of the insns. */
if (note_list != 0)
{
+ basic_block head_bb = BLOCK_FOR_INSN (head);
rtx note_head = note_list;
while (PREV_INSN (note_head))
{
+ set_block_for_insn (note_head, head_bb);
note_head = PREV_INSN (note_head);
}
+ /* In the above cycle we've missed this note: */
+ set_block_for_insn (note_head, head_bb);
PREV_INSN (note_head) = PREV_INSN (head);
NEXT_INSN (PREV_INSN (head)) = note_head;
n_insn++;
(void) priority (insn);
- if (INSN_PRIORITY_KNOWN (insn))
- sched_max_insns_priority =
- MAX (sched_max_insns_priority, INSN_PRIORITY (insn));
+ gcc_assert (INSN_PRIORITY_KNOWN (insn));
+
+ sched_max_insns_priority = MAX (sched_max_insns_priority,
+ INSN_PRIORITY (insn));
}
current_sched_info->sched_max_insns_priority = sched_max_insns_priority;
return n_insn;
}
+/* Next LUID to assign to an instruction. */
+static int luid;
+
/* Initialize some global state for the scheduler. */
void
sched_init (void)
{
- int luid;
basic_block b;
rtx insn;
int i;
+ /* Switch to working copy of sched_info. */
+ memcpy (¤t_sched_info_var, current_sched_info,
+ sizeof (current_sched_info_var));
+ current_sched_info = ¤t_sched_info_var;
+
/* Disable speculative loads in their presence if cc0 defined. */
#ifdef HAVE_cc0
flag_schedule_speculative_load = 0;
sched_dump = ((sched_verbose_param >= 10 || !dump_file)
? stderr : dump_file);
+ /* Initialize SPEC_INFO. */
+ if (targetm.sched.set_sched_flags)
+ {
+ spec_info = &spec_info_var;
+ targetm.sched.set_sched_flags (spec_info);
+ if (current_sched_info->flags & DO_SPECULATION)
+ spec_info->weakness_cutoff =
+ (PARAM_VALUE (PARAM_SCHED_SPEC_PROB_CUTOFF) * MAX_DEP_WEAK) / 100;
+ else
+ /* So we won't read anything accidentally. */
+ spec_info = 0;
+ }
+ else
+ /* So we won't read anything accidentally. */
+ spec_info = 0;
+
/* Initialize issue_rate. */
if (targetm.sched.issue_rate)
issue_rate = targetm.sched.issue_rate ();
cached_first_cycle_multipass_dfa_lookahead = 0;
}
- /* We use LUID 0 for the fake insn (UID 0) which holds dependencies for
- pseudos which do not cross calls. */
- old_max_uid = get_max_uid () + 1;
-
- h_i_d = XCNEWVEC (struct haifa_insn_data, old_max_uid);
+ old_max_uid = 0;
+ h_i_d = 0;
+ extend_h_i_d ();
for (i = 0; i < old_max_uid; i++)
{
h_i_d[i].cost = -1;
+ h_i_d[i].todo_spec = HARD_DEP;
h_i_d[i].queue_index = QUEUE_NOWHERE;
h_i_d[i].tick = INVALID_TICK;
h_i_d[i].inter_tick = INVALID_TICK;
init_alias_analysis ();
- if (write_symbols != NO_DEBUG)
- {
- rtx line;
-
- line_note_head = XCNEWVEC (rtx, last_basic_block);
-
- /* Save-line-note-head:
- Determine the line-number at the start of each basic block.
- This must be computed and saved now, because after a basic block's
- predecessor has been scheduled, it is impossible to accurately
- determine the correct line number for the first insn of the block. */
-
- FOR_EACH_BB (b)
- {
- for (line = BB_HEAD (b); line; line = PREV_INSN (line))
- if (NOTE_P (line) && NOTE_LINE_NUMBER (line) > 0)
- {
- line_note_head[b->index] = line;
- break;
- }
- /* Do a forward search as well, since we won't get to see the first
- notes in a basic block. */
- for (line = BB_HEAD (b); line; line = NEXT_INSN (line))
- {
- if (INSN_P (line))
- break;
- if (NOTE_P (line) && NOTE_LINE_NUMBER (line) > 0)
- line_note_head[b->index] = line;
- }
- }
- }
-
- /* The following is done to keep current_sched_info->next_tail non null. */
-
- insn = BB_END (EXIT_BLOCK_PTR->prev_bb);
- if (NEXT_INSN (insn) == 0
- || (!NOTE_P (insn)
- && !LABEL_P (insn)
- /* Don't emit a NOTE if it would end up before a BARRIER. */
- && !BARRIER_P (NEXT_INSN (insn))))
- {
- emit_note_after (NOTE_INSN_DELETED, insn);
- /* Make insn to appear outside BB. */
- BB_END (EXIT_BLOCK_PTR->prev_bb) = insn;
- }
+ old_last_basic_block = 0;
+ extend_bb ();
/* Compute INSN_REG_WEIGHT for all blocks. We must do this before
removing death notes. */
FOR_EACH_BB_REVERSE (b)
- find_insn_reg_weight (b->index);
+ find_insn_reg_weight (b);
if (targetm.sched.md_init_global)
targetm.sched.md_init_global (sched_dump, sched_verbose, old_max_uid);
+
+ nr_begin_data = nr_begin_control = nr_be_in_data = nr_be_in_control = 0;
+ before_recovery = 0;
+
+ haifa_recovery_bb_ever_added_p = false;
+
+#ifdef ENABLE_CHECKING
+ /* This is used preferably for finding bugs in check_cfg () itself. */
+ check_cfg (0, 0);
+#endif
}
/* Free global data used during insn scheduling. */
dfa_finish ();
free_dependency_caches ();
end_alias_analysis ();
- if (write_symbols != NO_DEBUG)
- free (line_note_head);
if (targetm.sched.md_finish_global)
- targetm.sched.md_finish_global (sched_dump, sched_verbose);
+ targetm.sched.md_finish_global (sched_dump, sched_verbose);
+
+ if (spec_info && spec_info->dump)
+ {
+ char c = reload_completed ? 'a' : 'b';
+
+ fprintf (spec_info->dump,
+ ";; %s:\n", current_function_name ());
+
+ fprintf (spec_info->dump,
+ ";; Procedure %cr-begin-data-spec motions == %d\n",
+ c, nr_begin_data);
+ fprintf (spec_info->dump,
+ ";; Procedure %cr-be-in-data-spec motions == %d\n",
+ c, nr_be_in_data);
+ fprintf (spec_info->dump,
+ ";; Procedure %cr-begin-control-spec motions == %d\n",
+ c, nr_begin_control);
+ fprintf (spec_info->dump,
+ ";; Procedure %cr-be-in-control-spec motions == %d\n",
+ c, nr_be_in_control);
+ }
+
+#ifdef ENABLE_CHECKING
+ /* After reload ia64 backend clobbers CFG, so can't check anything. */
+ if (!reload_completed)
+ check_cfg (0, 0);
+#endif
current_sched_info = NULL;
}
/* Fix INSN_TICKs of the instructions in the current block as well as
- INSN_TICKs of their dependants.
+ INSN_TICKs of their dependents.
HEAD and TAIL are the begin and the end of the current scheduled block. */
static void
fix_inter_tick (rtx head, rtx tail)
{
/* Set of instructions with corrected INSN_TICK. */
bitmap_head processed;
+ /* ??? It is doubtful if we should assume that cycle advance happens on
+ basic block boundaries. Basically insns that are unconditionally ready
+ on the start of the block are more preferable then those which have
+ a one cycle dependency over insn from the previous block. */
int next_clock = clock_var + 1;
bitmap_initialize (&processed, 0);
if (INSN_P (head))
{
int tick;
- rtx link;
+ sd_iterator_def sd_it;
+ dep_t dep;
tick = INSN_TICK (head);
gcc_assert (tick >= MIN_TICK);
INSN_TICK (head) = tick;
}
- for (link = INSN_DEPEND (head); link; link = XEXP (link, 1))
+ FOR_EACH_DEP (head, SD_LIST_RES_FORW, sd_it, dep)
{
rtx next;
- next = XEXP (link, 0);
+ next = DEP_CON (dep);
tick = INSN_TICK (next);
if (tick != INVALID_TICK
INTER_TICK (next) = tick;
else
tick = INTER_TICK (next);
-
+
INSN_TICK (next) = tick;
}
}
0 < N - queued for N cycles. */
int
try_ready (rtx next)
-{
- if (LOG_LINKS (next)
- || (current_sched_info->new_ready
- && !current_sched_info->new_ready (next)))
+{
+ ds_t old_ts, *ts;
+
+ ts = &TODO_SPEC (next);
+ old_ts = *ts;
+
+ gcc_assert (!(old_ts & ~(SPECULATIVE | HARD_DEP))
+ && ((old_ts & HARD_DEP)
+ || (old_ts & SPECULATIVE)));
+
+ if (sd_lists_empty_p (next, SD_LIST_BACK))
+ /* NEXT has all its dependencies resolved. */
+ {
+ /* Remove HARD_DEP bit from NEXT's status. */
+ *ts &= ~HARD_DEP;
+
+ if (current_sched_info->flags & DO_SPECULATION)
+ /* Remove all speculative bits from NEXT's status. */
+ *ts &= ~SPECULATIVE;
+ }
+ else
+ {
+ /* One of the NEXT's dependencies has been resolved.
+ Recalculate NEXT's status. */
+
+ *ts &= ~SPECULATIVE & ~HARD_DEP;
+
+ if (sd_lists_empty_p (next, SD_LIST_HARD_BACK))
+ /* Now we've got NEXT with speculative deps only.
+ 1. Look at the deps to see what we have to do.
+ 2. Check if we can do 'todo'. */
+ {
+ sd_iterator_def sd_it;
+ dep_t dep;
+ bool first_p = true;
+
+ FOR_EACH_DEP (next, SD_LIST_BACK, sd_it, dep)
+ {
+ ds_t ds = DEP_STATUS (dep) & SPECULATIVE;
+
+ if (first_p)
+ {
+ first_p = false;
+
+ *ts = ds;
+ }
+ else
+ *ts = ds_merge (*ts, ds);
+ }
+
+ if (dep_weak (*ts) < spec_info->weakness_cutoff)
+ /* Too few points. */
+ *ts = (*ts & ~SPECULATIVE) | HARD_DEP;
+ }
+ else
+ *ts |= HARD_DEP;
+ }
+
+ if (*ts & HARD_DEP)
+ gcc_assert (*ts == old_ts
+ && QUEUE_INDEX (next) == QUEUE_NOWHERE);
+ else if (current_sched_info->new_ready)
+ *ts = current_sched_info->new_ready (next, *ts);
+
+ /* * if !(old_ts & SPECULATIVE) (e.g. HARD_DEP or 0), then insn might
+ have its original pattern or changed (speculative) one. This is due
+ to changing ebb in region scheduling.
+ * But if (old_ts & SPECULATIVE), then we are pretty sure that insn
+ has speculative pattern.
+
+ We can't assert (!(*ts & HARD_DEP) || *ts == old_ts) here because
+ control-speculative NEXT could have been discarded by sched-rgn.c
+ (the same case as when discarded by can_schedule_ready_p ()). */
+
+ if ((*ts & SPECULATIVE)
+ /* If (old_ts == *ts), then (old_ts & SPECULATIVE) and we don't
+ need to change anything. */
+ && *ts != old_ts)
+ {
+ int res;
+ rtx new_pat;
+
+ gcc_assert ((*ts & SPECULATIVE) && !(*ts & ~SPECULATIVE));
+
+ res = speculate_insn (next, *ts, &new_pat);
+
+ switch (res)
+ {
+ case -1:
+ /* It would be nice to change DEP_STATUS of all dependences,
+ which have ((DEP_STATUS & SPECULATIVE) == *ts) to HARD_DEP,
+ so we won't reanalyze anything. */
+ *ts = (*ts & ~SPECULATIVE) | HARD_DEP;
+ break;
+
+ case 0:
+ /* We follow the rule, that every speculative insn
+ has non-null ORIG_PAT. */
+ if (!ORIG_PAT (next))
+ ORIG_PAT (next) = PATTERN (next);
+ break;
+
+ case 1:
+ if (!ORIG_PAT (next))
+ /* If we gonna to overwrite the original pattern of insn,
+ save it. */
+ ORIG_PAT (next) = PATTERN (next);
+
+ change_pattern (next, new_pat);
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
+ }
+
+ /* We need to restore pattern only if (*ts == 0), because otherwise it is
+ either correct (*ts & SPECULATIVE),
+ or we simply don't care (*ts & HARD_DEP). */
+
+ gcc_assert (!ORIG_PAT (next)
+ || !IS_SPECULATION_BRANCHY_CHECK_P (next));
+
+ if (*ts & HARD_DEP)
{
- gcc_assert (QUEUE_INDEX (next) == QUEUE_NOWHERE);
+ /* We can't assert (QUEUE_INDEX (next) == QUEUE_NOWHERE) here because
+ control-speculative NEXT could have been discarded by sched-rgn.c
+ (the same case as when discarded by can_schedule_ready_p ()). */
+ /*gcc_assert (QUEUE_INDEX (next) == QUEUE_NOWHERE);*/
+
+ change_queue_index (next, QUEUE_NOWHERE);
return -1;
}
+ else if (!(*ts & BEGIN_SPEC) && ORIG_PAT (next) && !IS_SPECULATION_CHECK_P (next))
+ /* We should change pattern of every previously speculative
+ instruction - and we determine if NEXT was speculative by using
+ ORIG_PAT field. Except one case - speculation checks have ORIG_PAT
+ pat too, so skip them. */
+ {
+ change_pattern (next, ORIG_PAT (next));
+ ORIG_PAT (next) = 0;
+ }
if (sched_verbose >= 2)
- fprintf (sched_dump, ";;\t\tdependencies resolved: insn %s\n",
- (*current_sched_info->print_insn) (next, 0));
-
- adjust_priority (next);
+ {
+ int s = TODO_SPEC (next);
+
+ fprintf (sched_dump, ";;\t\tdependencies resolved: insn %s",
+ (*current_sched_info->print_insn) (next, 0));
+
+ if (spec_info && spec_info->dump)
+ {
+ if (s & BEGIN_DATA)
+ fprintf (spec_info->dump, "; data-spec;");
+ if (s & BEGIN_CONTROL)
+ fprintf (spec_info->dump, "; control-spec;");
+ if (s & BE_IN_CONTROL)
+ fprintf (spec_info->dump, "; in-control-spec;");
+ }
+ fprintf (sched_dump, "\n");
+ }
+
+ adjust_priority (next);
+
return fix_tick_ready (next);
}
static int
fix_tick_ready (rtx next)
{
- rtx link;
int tick, delay;
- link = RESOLVED_DEPS (next);
-
- if (link)
+ if (!sd_lists_empty_p (next, SD_LIST_RES_BACK))
{
int full_p;
+ sd_iterator_def sd_it;
+ dep_t dep;
tick = INSN_TICK (next);
- /* if tick is note equals to INVALID_TICK, then update
+ /* if tick is not equal to INVALID_TICK, then update
INSN_TICK of NEXT with the most recent resolved dependence
- cost. Overwise, recalculate from scratch. */
- full_p = tick == INVALID_TICK;
- do
- {
- rtx pro;
+ cost. Otherwise, recalculate from scratch. */
+ full_p = (tick == INVALID_TICK);
+
+ FOR_EACH_DEP (next, SD_LIST_RES_BACK, sd_it, dep)
+ {
+ rtx pro = DEP_PRO (dep);
int tick1;
- pro = XEXP (link, 0);
gcc_assert (INSN_TICK (pro) >= MIN_TICK);
- /* We should specify FORWARD link to insn_cost,
- but are giving a BACKWARD one.
- This is ok, because only REG_NOTE_KIND of link is used.
- May be substitute LINK with REG_NOTE_KIND? */
- tick1 = INSN_TICK (pro) + insn_cost (pro, link, next);
+
+ tick1 = INSN_TICK (pro) + dep_cost (dep);
if (tick1 > tick)
tick = tick1;
+
+ if (!full_p)
+ break;
}
- while ((link = XEXP (link, 1)) && full_p);
}
else
tick = -1;
delay = QUEUE_READY;
change_queue_index (next, delay);
-
+
return delay;
}
/* We have nothing to do. */
return;
- /* Remove NEXT from whereever it is now. */
+ /* Remove NEXT from wherever it is now. */
if (i == QUEUE_READY)
ready_remove_insn (next);
else if (i >= 0)
}
}
-/* INSN is being scheduled. Resolve the dependence between INSN and NEXT. */
+/* Extend H_I_D data. */
static void
-resolve_dep (rtx next, rtx insn)
+extend_h_i_d (void)
{
- rtx dep;
+ /* We use LUID 0 for the fake insn (UID 0) which holds dependencies for
+ pseudos which do not cross calls. */
+ int new_max_uid = get_max_uid () + 1;
- INSN_DEP_COUNT (next)--;
-
- dep = remove_list_elem (insn, &LOG_LINKS (next));
- XEXP (dep, 1) = RESOLVED_DEPS (next);
- RESOLVED_DEPS (next) = dep;
-
- gcc_assert ((INSN_DEP_COUNT (next) != 0 || !LOG_LINKS (next))
- && (LOG_LINKS (next) || INSN_DEP_COUNT (next) == 0));
+ h_i_d = xrecalloc (h_i_d, new_max_uid, old_max_uid, sizeof (*h_i_d));
+ old_max_uid = new_max_uid;
+
+ if (targetm.sched.h_i_d_extended)
+ targetm.sched.h_i_d_extended ();
+}
+
+/* Extend READY, READY_TRY and CHOICE_STACK arrays.
+ N_NEW_INSNS is the number of additional elements to allocate. */
+static void
+extend_ready (int n_new_insns)
+{
+ int i;
+
+ readyp->veclen = rgn_n_insns + n_new_insns + 1 + issue_rate;
+ readyp->vec = XRESIZEVEC (rtx, readyp->vec, readyp->veclen);
+
+ ready_try = xrecalloc (ready_try, rgn_n_insns + n_new_insns + 1,
+ rgn_n_insns + 1, sizeof (char));
+
+ rgn_n_insns += n_new_insns;
+
+ choice_stack = XRESIZEVEC (struct choice_entry, choice_stack,
+ rgn_n_insns + 1);
+
+ for (i = rgn_n_insns; n_new_insns--; i--)
+ choice_stack[i].state = xmalloc (dfa_state_size);
+}
+
+/* Extend global scheduler structures (those, that live across calls to
+ schedule_block) to include information about just emitted INSN. */
+static void
+extend_global (rtx insn)
+{
+ gcc_assert (INSN_P (insn));
+
+ /* These structures have scheduler scope. */
+
+ /* Init h_i_d. */
+ extend_h_i_d ();
+ init_h_i_d (insn);
+
+ /* Init data handled in sched-deps.c. */
+ sd_init_insn (insn);
+
+ /* Extend dependency caches by one element. */
+ extend_dependency_caches (1, false);
+}
+
+/* Extends global and local scheduler structures to include information
+ about just emitted INSN. */
+static void
+extend_all (rtx insn)
+{
+ extend_global (insn);
+
+ /* These structures have block scope. */
+ extend_ready (1);
+
+ (*current_sched_info->add_remove_insn) (insn, 0);
+}
+
+/* Initialize h_i_d entry of the new INSN with default values.
+ Values, that are not explicitly initialized here, hold zero. */
+static void
+init_h_i_d (rtx insn)
+{
+ INSN_LUID (insn) = luid++;
+ INSN_COST (insn) = -1;
+ TODO_SPEC (insn) = HARD_DEP;
+ QUEUE_INDEX (insn) = QUEUE_NOWHERE;
+ INSN_TICK (insn) = INVALID_TICK;
+ INTER_TICK (insn) = INVALID_TICK;
+ find_insn_reg_weight1 (insn);
+}
+
+/* Generates recovery code for INSN. */
+static void
+generate_recovery_code (rtx insn)
+{
+ if (TODO_SPEC (insn) & BEGIN_SPEC)
+ begin_speculative_block (insn);
+
+ /* Here we have insn with no dependencies to
+ instructions other then CHECK_SPEC ones. */
+
+ if (TODO_SPEC (insn) & BE_IN_SPEC)
+ add_to_speculative_block (insn);
+}
+
+/* Helper function.
+ Tries to add speculative dependencies of type FS between instructions
+ in deps_list L and TWIN. */
+static void
+process_insn_forw_deps_be_in_spec (rtx insn, rtx twin, ds_t fs)
+{
+ sd_iterator_def sd_it;
+ dep_t dep;
+
+ FOR_EACH_DEP (insn, SD_LIST_FORW, sd_it, dep)
+ {
+ ds_t ds;
+ rtx consumer;
+
+ consumer = DEP_CON (dep);
+
+ ds = DEP_STATUS (dep);
+
+ if (/* If we want to create speculative dep. */
+ fs
+ /* And we can do that because this is a true dep. */
+ && (ds & DEP_TYPES) == DEP_TRUE)
+ {
+ gcc_assert (!(ds & BE_IN_SPEC));
+
+ if (/* If this dep can be overcome with 'begin speculation'. */
+ ds & BEGIN_SPEC)
+ /* Then we have a choice: keep the dep 'begin speculative'
+ or transform it into 'be in speculative'. */
+ {
+ if (/* In try_ready we assert that if insn once became ready
+ it can be removed from the ready (or queue) list only
+ due to backend decision. Hence we can't let the
+ probability of the speculative dep to decrease. */
+ dep_weak (ds) <= dep_weak (fs))
+ {
+ ds_t new_ds;
+
+ new_ds = (ds & ~BEGIN_SPEC) | fs;
+
+ if (/* consumer can 'be in speculative'. */
+ sched_insn_is_legitimate_for_speculation_p (consumer,
+ new_ds))
+ /* Transform it to be in speculative. */
+ ds = new_ds;
+ }
+ }
+ else
+ /* Mark the dep as 'be in speculative'. */
+ ds |= fs;
+ }
+
+ {
+ dep_def _new_dep, *new_dep = &_new_dep;
+
+ init_dep_1 (new_dep, twin, consumer, DEP_TYPE (dep), ds);
+ sd_add_dep (new_dep, false);
+ }
+ }
+}
+
+/* Generates recovery code for BEGIN speculative INSN. */
+static void
+begin_speculative_block (rtx insn)
+{
+ if (TODO_SPEC (insn) & BEGIN_DATA)
+ nr_begin_data++;
+ if (TODO_SPEC (insn) & BEGIN_CONTROL)
+ nr_begin_control++;
+
+ create_check_block_twin (insn, false);
+
+ TODO_SPEC (insn) &= ~BEGIN_SPEC;
+}
+
+/* Generates recovery code for BE_IN speculative INSN. */
+static void
+add_to_speculative_block (rtx insn)
+{
+ ds_t ts;
+ sd_iterator_def sd_it;
+ dep_t dep;
+ rtx twins = NULL;
+ rtx_vec_t priorities_roots;
+
+ ts = TODO_SPEC (insn);
+ gcc_assert (!(ts & ~BE_IN_SPEC));
+
+ if (ts & BE_IN_DATA)
+ nr_be_in_data++;
+ if (ts & BE_IN_CONTROL)
+ nr_be_in_control++;
+
+ TODO_SPEC (insn) &= ~BE_IN_SPEC;
+ gcc_assert (!TODO_SPEC (insn));
+
+ DONE_SPEC (insn) |= ts;
+
+ /* First we convert all simple checks to branchy. */
+ for (sd_it = sd_iterator_start (insn, SD_LIST_SPEC_BACK);
+ sd_iterator_cond (&sd_it, &dep);)
+ {
+ rtx check = DEP_PRO (dep);
+
+ if (IS_SPECULATION_SIMPLE_CHECK_P (check))
+ {
+ create_check_block_twin (check, true);
+
+ /* Restart search. */
+ sd_it = sd_iterator_start (insn, SD_LIST_SPEC_BACK);
+ }
+ else
+ /* Continue search. */
+ sd_iterator_next (&sd_it);
+ }
+
+ priorities_roots = NULL;
+ clear_priorities (insn, &priorities_roots);
+
+ while (1)
+ {
+ rtx check, twin;
+ basic_block rec;
+
+ /* Get the first backward dependency of INSN. */
+ sd_it = sd_iterator_start (insn, SD_LIST_SPEC_BACK);
+ if (!sd_iterator_cond (&sd_it, &dep))
+ /* INSN has no backward dependencies left. */
+ break;
+
+ gcc_assert ((DEP_STATUS (dep) & BEGIN_SPEC) == 0
+ && (DEP_STATUS (dep) & BE_IN_SPEC) != 0
+ && (DEP_STATUS (dep) & DEP_TYPES) == DEP_TRUE);
+
+ check = DEP_PRO (dep);
+
+ gcc_assert (!IS_SPECULATION_CHECK_P (check) && !ORIG_PAT (check)
+ && QUEUE_INDEX (check) == QUEUE_NOWHERE);
+
+ rec = BLOCK_FOR_INSN (check);
+
+ twin = emit_insn_before (copy_insn (PATTERN (insn)), BB_END (rec));
+ extend_global (twin);
+
+ sd_copy_back_deps (twin, insn, true);
+
+ if (sched_verbose && spec_info->dump)
+ /* INSN_BB (insn) isn't determined for twin insns yet.
+ So we can't use current_sched_info->print_insn. */
+ fprintf (spec_info->dump, ";;\t\tGenerated twin insn : %d/rec%d\n",
+ INSN_UID (twin), rec->index);
+
+ twins = alloc_INSN_LIST (twin, twins);
+
+ /* Add dependences between TWIN and all appropriate
+ instructions from REC. */
+ FOR_EACH_DEP (insn, SD_LIST_SPEC_BACK, sd_it, dep)
+ {
+ rtx pro = DEP_PRO (dep);
+
+ gcc_assert (DEP_TYPE (dep) == REG_DEP_TRUE);
+
+ /* INSN might have dependencies from the instructions from
+ several recovery blocks. At this iteration we process those
+ producers that reside in REC. */
+ if (BLOCK_FOR_INSN (pro) == rec)
+ {
+ dep_def _new_dep, *new_dep = &_new_dep;
+
+ init_dep (new_dep, pro, twin, REG_DEP_TRUE);
+ sd_add_dep (new_dep, false);
+ }
+ }
+
+ process_insn_forw_deps_be_in_spec (insn, twin, ts);
+
+ /* Remove all dependencies between INSN and insns in REC. */
+ for (sd_it = sd_iterator_start (insn, SD_LIST_SPEC_BACK);
+ sd_iterator_cond (&sd_it, &dep);)
+ {
+ rtx pro = DEP_PRO (dep);
+
+ if (BLOCK_FOR_INSN (pro) == rec)
+ sd_delete_dep (sd_it);
+ else
+ sd_iterator_next (&sd_it);
+ }
+ }
+
+ /* We couldn't have added the dependencies between INSN and TWINS earlier
+ because that would make TWINS appear in the INSN_BACK_DEPS (INSN). */
+ while (twins)
+ {
+ rtx twin;
+
+ twin = XEXP (twins, 0);
+
+ {
+ dep_def _new_dep, *new_dep = &_new_dep;
+
+ init_dep (new_dep, insn, twin, REG_DEP_OUTPUT);
+ sd_add_dep (new_dep, false);
+ }
+
+ twin = XEXP (twins, 1);
+ free_INSN_LIST_node (twins);
+ twins = twin;
+ }
+
+ calc_priorities (priorities_roots);
+ VEC_free (rtx, heap, priorities_roots);
+}
+
+/* Extends and fills with zeros (only the new part) array pointed to by P. */
+void *
+xrecalloc (void *p, size_t new_nmemb, size_t old_nmemb, size_t size)
+{
+ gcc_assert (new_nmemb >= old_nmemb);
+ p = XRESIZEVAR (void, p, new_nmemb * size);
+ memset (((char *) p) + old_nmemb * size, 0, (new_nmemb - old_nmemb) * size);
+ return p;
+}
+
+/* Return the probability of speculation success for the speculation
+ status DS. */
+static dw_t
+dep_weak (ds_t ds)
+{
+ ds_t res = 1, dt;
+ int n = 0;
+
+ dt = FIRST_SPEC_TYPE;
+ do
+ {
+ if (ds & dt)
+ {
+ res *= (ds_t) get_dep_weak (ds, dt);
+ n++;
+ }
+
+ if (dt == LAST_SPEC_TYPE)
+ break;
+ dt <<= SPEC_TYPE_SHIFT;
+ }
+ while (1);
+
+ gcc_assert (n);
+ while (--n)
+ res /= MAX_DEP_WEAK;
+
+ if (res < MIN_DEP_WEAK)
+ res = MIN_DEP_WEAK;
+
+ gcc_assert (res <= MAX_DEP_WEAK);
+
+ return (dw_t) res;
+}
+
+/* Helper function.
+ Find fallthru edge from PRED. */
+static edge
+find_fallthru_edge (basic_block pred)
+{
+ edge e;
+ edge_iterator ei;
+ basic_block succ;
+
+ succ = pred->next_bb;
+ gcc_assert (succ->prev_bb == pred);
+
+ if (EDGE_COUNT (pred->succs) <= EDGE_COUNT (succ->preds))
+ {
+ FOR_EACH_EDGE (e, ei, pred->succs)
+ if (e->flags & EDGE_FALLTHRU)
+ {
+ gcc_assert (e->dest == succ);
+ return e;
+ }
+ }
+ else
+ {
+ FOR_EACH_EDGE (e, ei, succ->preds)
+ if (e->flags & EDGE_FALLTHRU)
+ {
+ gcc_assert (e->src == pred);
+ return e;
+ }
+ }
+
+ return NULL;
+}
+
+/* Initialize BEFORE_RECOVERY variable. */
+static void
+init_before_recovery (void)
+{
+ basic_block last;
+ edge e;
+
+ last = EXIT_BLOCK_PTR->prev_bb;
+ e = find_fallthru_edge (last);
+
+ if (e)
+ {
+ /* We create two basic blocks:
+ 1. Single instruction block is inserted right after E->SRC
+ and has jump to
+ 2. Empty block right before EXIT_BLOCK.
+ Between these two blocks recovery blocks will be emitted. */
+
+ basic_block single, empty;
+ rtx x, label;
+
+ single = create_empty_bb (last);
+ empty = create_empty_bb (single);
+
+ single->count = last->count;
+ empty->count = last->count;
+ single->frequency = last->frequency;
+ empty->frequency = last->frequency;
+ BB_COPY_PARTITION (single, last);
+ BB_COPY_PARTITION (empty, last);
+
+ redirect_edge_succ (e, single);
+ make_single_succ_edge (single, empty, 0);
+ make_single_succ_edge (empty, EXIT_BLOCK_PTR,
+ EDGE_FALLTHRU | EDGE_CAN_FALLTHRU);
+
+ label = block_label (empty);
+ x = emit_jump_insn_after (gen_jump (label), BB_END (single));
+ JUMP_LABEL (x) = label;
+ LABEL_NUSES (label)++;
+ extend_global (x);
+
+ emit_barrier_after (x);
+
+ add_block (empty, 0);
+ add_block (single, 0);
+
+ before_recovery = single;
+
+ if (sched_verbose >= 2 && spec_info->dump)
+ fprintf (spec_info->dump,
+ ";;\t\tFixed fallthru to EXIT : %d->>%d->%d->>EXIT\n",
+ last->index, single->index, empty->index);
+ }
+ else
+ before_recovery = last;
+}
+
+/* Returns new recovery block. */
+static basic_block
+create_recovery_block (void)
+{
+ rtx label;
+ rtx barrier;
+ basic_block rec;
+
+ haifa_recovery_bb_recently_added_p = true;
+ haifa_recovery_bb_ever_added_p = true;
+
+ if (!before_recovery)
+ init_before_recovery ();
+
+ barrier = get_last_bb_insn (before_recovery);
+ gcc_assert (BARRIER_P (barrier));
+
+ label = emit_label_after (gen_label_rtx (), barrier);
+
+ rec = create_basic_block (label, label, before_recovery);
+
+ /* Recovery block always end with an unconditional jump. */
+ emit_barrier_after (BB_END (rec));
+
+ if (BB_PARTITION (before_recovery) != BB_UNPARTITIONED)
+ BB_SET_PARTITION (rec, BB_COLD_PARTITION);
+
+ if (sched_verbose && spec_info->dump)
+ fprintf (spec_info->dump, ";;\t\tGenerated recovery block rec%d\n",
+ rec->index);
+
+ before_recovery = rec;
+
+ return rec;
+}
+
+/* This function creates recovery code for INSN. If MUTATE_P is nonzero,
+ INSN is a simple check, that should be converted to branchy one. */
+static void
+create_check_block_twin (rtx insn, bool mutate_p)
+{
+ basic_block rec;
+ rtx label, check, twin;
+ ds_t fs;
+ sd_iterator_def sd_it;
+ dep_t dep;
+ dep_def _new_dep, *new_dep = &_new_dep;
+
+ gcc_assert (ORIG_PAT (insn)
+ && (!mutate_p
+ || (IS_SPECULATION_SIMPLE_CHECK_P (insn)
+ && !(TODO_SPEC (insn) & SPECULATIVE))));
+
+ /* Create recovery block. */
+ if (mutate_p || targetm.sched.needs_block_p (insn))
+ {
+ rec = create_recovery_block ();
+ label = BB_HEAD (rec);
+ }
+ else
+ {
+ rec = EXIT_BLOCK_PTR;
+ label = 0;
+ }
+
+ /* Emit CHECK. */
+ check = targetm.sched.gen_check (insn, label, mutate_p);
+
+ if (rec != EXIT_BLOCK_PTR)
+ {
+ /* To have mem_reg alive at the beginning of second_bb,
+ we emit check BEFORE insn, so insn after splitting
+ insn will be at the beginning of second_bb, which will
+ provide us with the correct life information. */
+ check = emit_jump_insn_before (check, insn);
+ JUMP_LABEL (check) = label;
+ LABEL_NUSES (label)++;
+ }
+ else
+ check = emit_insn_before (check, insn);
+
+ /* Extend data structures. */
+ extend_all (check);
+ RECOVERY_BLOCK (check) = rec;
+
+ if (sched_verbose && spec_info->dump)
+ fprintf (spec_info->dump, ";;\t\tGenerated check insn : %s\n",
+ (*current_sched_info->print_insn) (check, 0));
+
+ gcc_assert (ORIG_PAT (insn));
+
+ /* Initialize TWIN (twin is a duplicate of original instruction
+ in the recovery block). */
+ if (rec != EXIT_BLOCK_PTR)
+ {
+ sd_iterator_def sd_it;
+ dep_t dep;
+
+ FOR_EACH_DEP (insn, SD_LIST_RES_BACK, sd_it, dep)
+ if ((DEP_STATUS (dep) & DEP_OUTPUT) != 0)
+ {
+ struct _dep _dep2, *dep2 = &_dep2;
+
+ init_dep (dep2, DEP_PRO (dep), check, REG_DEP_TRUE);
+
+ sd_add_dep (dep2, true);
+ }
+
+ twin = emit_insn_after (ORIG_PAT (insn), BB_END (rec));
+ extend_global (twin);
+
+ if (sched_verbose && spec_info->dump)
+ /* INSN_BB (insn) isn't determined for twin insns yet.
+ So we can't use current_sched_info->print_insn. */
+ fprintf (spec_info->dump, ";;\t\tGenerated twin insn : %d/rec%d\n",
+ INSN_UID (twin), rec->index);
+ }
+ else
+ {
+ ORIG_PAT (check) = ORIG_PAT (insn);
+ HAS_INTERNAL_DEP (check) = 1;
+ twin = check;
+ /* ??? We probably should change all OUTPUT dependencies to
+ (TRUE | OUTPUT). */
+ }
+
+ /* Copy all resolved back dependencies of INSN to TWIN. This will
+ provide correct value for INSN_TICK (TWIN). */
+ sd_copy_back_deps (twin, insn, true);
+
+ if (rec != EXIT_BLOCK_PTR)
+ /* In case of branchy check, fix CFG. */
+ {
+ basic_block first_bb, second_bb;
+ rtx jump;
+ edge e;
+ int edge_flags;
+
+ first_bb = BLOCK_FOR_INSN (check);
+ e = split_block (first_bb, check);
+ /* split_block emits note if *check == BB_END. Probably it
+ is better to rip that note off. */
+ gcc_assert (e->src == first_bb);
+ second_bb = e->dest;
+
+ /* This is fixing of incoming edge. */
+ /* ??? Which other flags should be specified? */
+ if (BB_PARTITION (first_bb) != BB_PARTITION (rec))
+ /* Partition type is the same, if it is "unpartitioned". */
+ edge_flags = EDGE_CROSSING;
+ else
+ edge_flags = 0;
+
+ e = make_edge (first_bb, rec, edge_flags);
+
+ add_block (second_bb, first_bb);
+
+ gcc_assert (NOTE_INSN_BASIC_BLOCK_P (BB_HEAD (second_bb)));
+ label = block_label (second_bb);
+ jump = emit_jump_insn_after (gen_jump (label), BB_END (rec));
+ JUMP_LABEL (jump) = label;
+ LABEL_NUSES (label)++;
+ extend_global (jump);
+
+ if (BB_PARTITION (second_bb) != BB_PARTITION (rec))
+ /* Partition type is the same, if it is "unpartitioned". */
+ {
+ /* Rewritten from cfgrtl.c. */
+ if (flag_reorder_blocks_and_partition
+ && targetm.have_named_sections
+ /*&& !any_condjump_p (jump)*/)
+ /* any_condjump_p (jump) == false.
+ We don't need the same note for the check because
+ any_condjump_p (check) == true. */
+ {
+ REG_NOTES (jump) = gen_rtx_EXPR_LIST (REG_CROSSING_JUMP,
+ NULL_RTX,
+ REG_NOTES (jump));
+ }
+ edge_flags = EDGE_CROSSING;
+ }
+ else
+ edge_flags = 0;
+
+ make_single_succ_edge (rec, second_bb, edge_flags);
+
+ add_block (rec, EXIT_BLOCK_PTR);
+ }
+
+ /* Move backward dependences from INSN to CHECK and
+ move forward dependences from INSN to TWIN. */
+
+ /* First, create dependencies between INSN's producers and CHECK & TWIN. */
+ FOR_EACH_DEP (insn, SD_LIST_BACK, sd_it, dep)
+ {
+ rtx pro = DEP_PRO (dep);
+ ds_t ds;
+
+ /* If BEGIN_DATA: [insn ~~TRUE~~> producer]:
+ check --TRUE--> producer ??? or ANTI ???
+ twin --TRUE--> producer
+ twin --ANTI--> check
+
+ If BEGIN_CONTROL: [insn ~~ANTI~~> producer]:
+ check --ANTI--> producer
+ twin --ANTI--> producer
+ twin --ANTI--> check
+
+ If BE_IN_SPEC: [insn ~~TRUE~~> producer]:
+ check ~~TRUE~~> producer
+ twin ~~TRUE~~> producer
+ twin --ANTI--> check */
+
+ ds = DEP_STATUS (dep);
+
+ if (ds & BEGIN_SPEC)
+ {
+ gcc_assert (!mutate_p);
+ ds &= ~BEGIN_SPEC;
+ }
+
+ init_dep_1 (new_dep, pro, check, DEP_TYPE (dep), ds);
+ sd_add_dep (new_dep, false);
+
+ if (rec != EXIT_BLOCK_PTR)
+ {
+ DEP_CON (new_dep) = twin;
+ sd_add_dep (new_dep, false);
+ }
+ }
+
+ /* Second, remove backward dependencies of INSN. */
+ for (sd_it = sd_iterator_start (insn, SD_LIST_SPEC_BACK);
+ sd_iterator_cond (&sd_it, &dep);)
+ {
+ if ((DEP_STATUS (dep) & BEGIN_SPEC)
+ || mutate_p)
+ /* We can delete this dep because we overcome it with
+ BEGIN_SPECULATION. */
+ sd_delete_dep (sd_it);
+ else
+ sd_iterator_next (&sd_it);
+ }
+
+ /* Future Speculations. Determine what BE_IN speculations will be like. */
+ fs = 0;
+
+ /* Fields (DONE_SPEC (x) & BEGIN_SPEC) and CHECK_SPEC (x) are set only
+ here. */
+
+ gcc_assert (!DONE_SPEC (insn));
+
+ if (!mutate_p)
+ {
+ ds_t ts = TODO_SPEC (insn);
+
+ DONE_SPEC (insn) = ts & BEGIN_SPEC;
+ CHECK_SPEC (check) = ts & BEGIN_SPEC;
+
+ /* Luckiness of future speculations solely depends upon initial
+ BEGIN speculation. */
+ if (ts & BEGIN_DATA)
+ fs = set_dep_weak (fs, BE_IN_DATA, get_dep_weak (ts, BEGIN_DATA));
+ if (ts & BEGIN_CONTROL)
+ fs = set_dep_weak (fs, BE_IN_CONTROL,
+ get_dep_weak (ts, BEGIN_CONTROL));
+ }
+ else
+ CHECK_SPEC (check) = CHECK_SPEC (insn);
+
+ /* Future speculations: call the helper. */
+ process_insn_forw_deps_be_in_spec (insn, twin, fs);
+
+ if (rec != EXIT_BLOCK_PTR)
+ {
+ /* Which types of dependencies should we use here is,
+ generally, machine-dependent question... But, for now,
+ it is not. */
+
+ if (!mutate_p)
+ {
+ init_dep (new_dep, insn, check, REG_DEP_TRUE);
+ sd_add_dep (new_dep, false);
+
+ init_dep (new_dep, insn, twin, REG_DEP_OUTPUT);
+ sd_add_dep (new_dep, false);
+ }
+ else
+ {
+ if (spec_info->dump)
+ fprintf (spec_info->dump, ";;\t\tRemoved simple check : %s\n",
+ (*current_sched_info->print_insn) (insn, 0));
+
+ /* Remove all dependencies of the INSN. */
+ {
+ sd_it = sd_iterator_start (insn, (SD_LIST_FORW
+ | SD_LIST_BACK
+ | SD_LIST_RES_BACK));
+ while (sd_iterator_cond (&sd_it, &dep))
+ sd_delete_dep (sd_it);
+ }
+
+ /* If former check (INSN) already was moved to the ready (or queue)
+ list, add new check (CHECK) there too. */
+ if (QUEUE_INDEX (insn) != QUEUE_NOWHERE)
+ try_ready (check);
+
+ /* Remove old check from instruction stream and free its
+ data. */
+ sched_remove_insn (insn);
+ }
+
+ init_dep (new_dep, check, twin, REG_DEP_ANTI);
+ sd_add_dep (new_dep, false);
+ }
+ else
+ {
+ init_dep_1 (new_dep, insn, check, REG_DEP_TRUE, DEP_TRUE | DEP_OUTPUT);
+ sd_add_dep (new_dep, false);
+ }
+
+ if (!mutate_p)
+ /* Fix priorities. If MUTATE_P is nonzero, this is not necessary,
+ because it'll be done later in add_to_speculative_block. */
+ {
+ rtx_vec_t priorities_roots = NULL;
+
+ clear_priorities (twin, &priorities_roots);
+ calc_priorities (priorities_roots);
+ VEC_free (rtx, heap, priorities_roots);
+ }
+}
+
+/* Removes dependency between instructions in the recovery block REC
+ and usual region instructions. It keeps inner dependences so it
+ won't be necessary to recompute them. */
+static void
+fix_recovery_deps (basic_block rec)
+{
+ rtx note, insn, jump, ready_list = 0;
+ bitmap_head in_ready;
+ rtx link;
+
+ bitmap_initialize (&in_ready, 0);
+
+ /* NOTE - a basic block note. */
+ note = NEXT_INSN (BB_HEAD (rec));
+ gcc_assert (NOTE_INSN_BASIC_BLOCK_P (note));
+ insn = BB_END (rec);
+ gcc_assert (JUMP_P (insn));
+ insn = PREV_INSN (insn);
+
+ do
+ {
+ sd_iterator_def sd_it;
+ dep_t dep;
+
+ for (sd_it = sd_iterator_start (insn, SD_LIST_FORW);
+ sd_iterator_cond (&sd_it, &dep);)
+ {
+ rtx consumer = DEP_CON (dep);
+
+ if (BLOCK_FOR_INSN (consumer) != rec)
+ {
+ sd_delete_dep (sd_it);
+
+ if (!bitmap_bit_p (&in_ready, INSN_LUID (consumer)))
+ {
+ ready_list = alloc_INSN_LIST (consumer, ready_list);
+ bitmap_set_bit (&in_ready, INSN_LUID (consumer));
+ }
+ }
+ else
+ {
+ gcc_assert ((DEP_STATUS (dep) & DEP_TYPES) == DEP_TRUE);
+
+ sd_iterator_next (&sd_it);
+ }
+ }
+
+ insn = PREV_INSN (insn);
+ }
+ while (insn != note);
+
+ bitmap_clear (&in_ready);
+
+ /* Try to add instructions to the ready or queue list. */
+ for (link = ready_list; link; link = XEXP (link, 1))
+ try_ready (XEXP (link, 0));
+ free_INSN_LIST_list (&ready_list);
+
+ /* Fixing jump's dependences. */
+ insn = BB_HEAD (rec);
+ jump = BB_END (rec);
+
+ gcc_assert (LABEL_P (insn));
+ insn = NEXT_INSN (insn);
+
+ gcc_assert (NOTE_INSN_BASIC_BLOCK_P (insn));
+ add_jump_dependencies (insn, jump);
+}
+
+/* Changes pattern of the INSN to NEW_PAT. */
+static void
+change_pattern (rtx insn, rtx new_pat)
+{
+ int t;
+
+ t = validate_change (insn, &PATTERN (insn), new_pat, 0);
+ gcc_assert (t);
+ /* Invalidate INSN_COST, so it'll be recalculated. */
+ INSN_COST (insn) = -1;
+ /* Invalidate INSN_TICK, so it'll be recalculated. */
+ INSN_TICK (insn) = INVALID_TICK;
+ dfa_clear_single_insn_cache (insn);
+}
+
+/* Return true if INSN can potentially be speculated with type DS. */
+bool
+sched_insn_is_legitimate_for_speculation_p (const_rtx insn, ds_t ds)
+{
+ if (HAS_INTERNAL_DEP (insn))
+ return false;
+
+ if (!NONJUMP_INSN_P (insn))
+ return false;
+
+ if (SCHED_GROUP_P (insn))
+ return false;
+
+ if (IS_SPECULATION_CHECK_P (insn))
+ return false;
+
+ if (side_effects_p (PATTERN (insn)))
+ return false;
+
+ if ((ds & BE_IN_SPEC)
+ && may_trap_p (PATTERN (insn)))
+ return false;
+
+ return true;
+}
+
+/* -1 - can't speculate,
+ 0 - for speculation with REQUEST mode it is OK to use
+ current instruction pattern,
+ 1 - need to change pattern for *NEW_PAT to be speculative. */
+static int
+speculate_insn (rtx insn, ds_t request, rtx *new_pat)
+{
+ gcc_assert (current_sched_info->flags & DO_SPECULATION
+ && (request & SPECULATIVE)
+ && sched_insn_is_legitimate_for_speculation_p (insn, request));
+
+ if ((request & spec_info->mask) != request)
+ return -1;
+
+ if (request & BE_IN_SPEC
+ && !(request & BEGIN_SPEC))
+ return 0;
+
+ return targetm.sched.speculate_insn (insn, request & BEGIN_SPEC, new_pat);
+}
+
+/* Print some information about block BB, which starts with HEAD and
+ ends with TAIL, before scheduling it.
+ I is zero, if scheduler is about to start with the fresh ebb. */
+static void
+dump_new_block_header (int i, basic_block bb, rtx head, rtx tail)
+{
+ if (!i)
+ fprintf (sched_dump,
+ ";; ======================================================\n");
+ else
+ fprintf (sched_dump,
+ ";; =====================ADVANCING TO=====================\n");
+ fprintf (sched_dump,
+ ";; -- basic block %d from %d to %d -- %s reload\n",
+ bb->index, INSN_UID (head), INSN_UID (tail),
+ (reload_completed ? "after" : "before"));
+ fprintf (sched_dump,
+ ";; ======================================================\n");
+ fprintf (sched_dump, "\n");
+}
+
+/* Unlink basic block notes and labels and saves them, so they
+ can be easily restored. We unlink basic block notes in EBB to
+ provide back-compatibility with the previous code, as target backends
+ assume, that there'll be only instructions between
+ current_sched_info->{head and tail}. We restore these notes as soon
+ as we can.
+ FIRST (LAST) is the first (last) basic block in the ebb.
+ NB: In usual case (FIRST == LAST) nothing is really done. */
+void
+unlink_bb_notes (basic_block first, basic_block last)
+{
+ /* We DON'T unlink basic block notes of the first block in the ebb. */
+ if (first == last)
+ return;
+
+ bb_header = xmalloc (last_basic_block * sizeof (*bb_header));
+
+ /* Make a sentinel. */
+ if (last->next_bb != EXIT_BLOCK_PTR)
+ bb_header[last->next_bb->index] = 0;
+
+ first = first->next_bb;
+ do
+ {
+ rtx prev, label, note, next;
+
+ label = BB_HEAD (last);
+ if (LABEL_P (label))
+ note = NEXT_INSN (label);
+ else
+ note = label;
+ gcc_assert (NOTE_INSN_BASIC_BLOCK_P (note));
+
+ prev = PREV_INSN (label);
+ next = NEXT_INSN (note);
+ gcc_assert (prev && next);
+
+ NEXT_INSN (prev) = next;
+ PREV_INSN (next) = prev;
+
+ bb_header[last->index] = label;
+
+ if (last == first)
+ break;
+
+ last = last->prev_bb;
+ }
+ while (1);
+}
+
+/* Restore basic block notes.
+ FIRST is the first basic block in the ebb. */
+static void
+restore_bb_notes (basic_block first)
+{
+ if (!bb_header)
+ return;
+
+ /* We DON'T unlink basic block notes of the first block in the ebb. */
+ first = first->next_bb;
+ /* Remember: FIRST is actually a second basic block in the ebb. */
+
+ while (first != EXIT_BLOCK_PTR
+ && bb_header[first->index])
+ {
+ rtx prev, label, note, next;
+
+ label = bb_header[first->index];
+ prev = PREV_INSN (label);
+ next = NEXT_INSN (prev);
+
+ if (LABEL_P (label))
+ note = NEXT_INSN (label);
+ else
+ note = label;
+ gcc_assert (NOTE_INSN_BASIC_BLOCK_P (note));
+
+ bb_header[first->index] = 0;
+
+ NEXT_INSN (prev) = label;
+ NEXT_INSN (note) = next;
+ PREV_INSN (next) = note;
+
+ first = first->next_bb;
+ }
+
+ free (bb_header);
+ bb_header = 0;
+}
+
+/* Extend per basic block data structures of the scheduler.
+ If BB is NULL, initialize structures for the whole CFG.
+ Otherwise, initialize them for the just created BB. */
+static void
+extend_bb (void)
+{
+ rtx insn;
+
+ old_last_basic_block = last_basic_block;
+
+ /* The following is done to keep current_sched_info->next_tail non null. */
+
+ insn = BB_END (EXIT_BLOCK_PTR->prev_bb);
+ if (NEXT_INSN (insn) == 0
+ || (!NOTE_P (insn)
+ && !LABEL_P (insn)
+ /* Don't emit a NOTE if it would end up before a BARRIER. */
+ && !BARRIER_P (NEXT_INSN (insn))))
+ {
+ rtx note = emit_note_after (NOTE_INSN_DELETED, insn);
+ /* Make insn appear outside BB. */
+ set_block_for_insn (note, NULL);
+ BB_END (EXIT_BLOCK_PTR->prev_bb) = insn;
+ }
+}
+
+/* Add a basic block BB to extended basic block EBB.
+ If EBB is EXIT_BLOCK_PTR, then BB is recovery block.
+ If EBB is NULL, then BB should be a new region. */
+void
+add_block (basic_block bb, basic_block ebb)
+{
+ gcc_assert (current_sched_info->flags & NEW_BBS);
+
+ extend_bb ();
+
+ if (current_sched_info->add_block)
+ /* This changes only data structures of the front-end. */
+ current_sched_info->add_block (bb, ebb);
+}
+
+/* Helper function.
+ Fix CFG after both in- and inter-block movement of
+ control_flow_insn_p JUMP. */
+static void
+fix_jump_move (rtx jump)
+{
+ basic_block bb, jump_bb, jump_bb_next;
+
+ bb = BLOCK_FOR_INSN (PREV_INSN (jump));
+ jump_bb = BLOCK_FOR_INSN (jump);
+ jump_bb_next = jump_bb->next_bb;
+
+ gcc_assert (current_sched_info->flags & SCHED_EBB
+ || IS_SPECULATION_BRANCHY_CHECK_P (jump));
+
+ if (!NOTE_INSN_BASIC_BLOCK_P (BB_END (jump_bb_next)))
+ /* if jump_bb_next is not empty. */
+ BB_END (jump_bb) = BB_END (jump_bb_next);
+
+ if (BB_END (bb) != PREV_INSN (jump))
+ /* Then there are instruction after jump that should be placed
+ to jump_bb_next. */
+ BB_END (jump_bb_next) = BB_END (bb);
+ else
+ /* Otherwise jump_bb_next is empty. */
+ BB_END (jump_bb_next) = NEXT_INSN (BB_HEAD (jump_bb_next));
+
+ /* To make assertion in move_insn happy. */
+ BB_END (bb) = PREV_INSN (jump);
+
+ update_bb_for_insn (jump_bb_next);
+}
+
+/* Fix CFG after interblock movement of control_flow_insn_p JUMP. */
+static void
+move_block_after_check (rtx jump)
+{
+ basic_block bb, jump_bb, jump_bb_next;
+ VEC(edge,gc) *t;
+
+ bb = BLOCK_FOR_INSN (PREV_INSN (jump));
+ jump_bb = BLOCK_FOR_INSN (jump);
+ jump_bb_next = jump_bb->next_bb;
+
+ update_bb_for_insn (jump_bb);
+
+ gcc_assert (IS_SPECULATION_CHECK_P (jump)
+ || IS_SPECULATION_CHECK_P (BB_END (jump_bb_next)));
+
+ unlink_block (jump_bb_next);
+ link_block (jump_bb_next, bb);
+
+ t = bb->succs;
+ bb->succs = 0;
+ move_succs (&(jump_bb->succs), bb);
+ move_succs (&(jump_bb_next->succs), jump_bb);
+ move_succs (&t, jump_bb_next);
+
+ df_mark_solutions_dirty ();
+
+ if (current_sched_info->fix_recovery_cfg)
+ current_sched_info->fix_recovery_cfg
+ (bb->index, jump_bb->index, jump_bb_next->index);
+}
+
+/* Helper function for move_block_after_check.
+ This functions attaches edge vector pointed to by SUCCSP to
+ block TO. */
+static void
+move_succs (VEC(edge,gc) **succsp, basic_block to)
+{
+ edge e;
+ edge_iterator ei;
+
+ gcc_assert (to->succs == 0);
+
+ to->succs = *succsp;
+
+ FOR_EACH_EDGE (e, ei, to->succs)
+ e->src = to;
+
+ *succsp = 0;
+}
+
+/* Remove INSN from the instruction stream.
+ INSN should have any dependencies. */
+static void
+sched_remove_insn (rtx insn)
+{
+ sd_finish_insn (insn);
+
+ change_queue_index (insn, QUEUE_NOWHERE);
+ current_sched_info->add_remove_insn (insn, 1);
+ remove_insn (insn);
+}
+
+/* Clear priorities of all instructions, that are forward dependent on INSN.
+ Store in vector pointed to by ROOTS_PTR insns on which priority () should
+ be invoked to initialize all cleared priorities. */
+static void
+clear_priorities (rtx insn, rtx_vec_t *roots_ptr)
+{
+ sd_iterator_def sd_it;
+ dep_t dep;
+ bool insn_is_root_p = true;
+
+ gcc_assert (QUEUE_INDEX (insn) != QUEUE_SCHEDULED);
+
+ FOR_EACH_DEP (insn, SD_LIST_BACK, sd_it, dep)
+ {
+ rtx pro = DEP_PRO (dep);
+
+ if (INSN_PRIORITY_STATUS (pro) >= 0
+ && QUEUE_INDEX (insn) != QUEUE_SCHEDULED)
+ {
+ /* If DEP doesn't contribute to priority then INSN itself should
+ be added to priority roots. */
+ if (contributes_to_priority_p (dep))
+ insn_is_root_p = false;
+
+ INSN_PRIORITY_STATUS (pro) = -1;
+ clear_priorities (pro, roots_ptr);
+ }
+ }
+
+ if (insn_is_root_p)
+ VEC_safe_push (rtx, heap, *roots_ptr, insn);
+}
+
+/* Recompute priorities of instructions, whose priorities might have been
+ changed. ROOTS is a vector of instructions whose priority computation will
+ trigger initialization of all cleared priorities. */
+static void
+calc_priorities (rtx_vec_t roots)
+{
+ int i;
+ rtx insn;
+
+ for (i = 0; VEC_iterate (rtx, roots, i, insn); i++)
+ priority (insn);
+}
+
+
+/* Add dependences between JUMP and other instructions in the recovery
+ block. INSN is the first insn the recovery block. */
+static void
+add_jump_dependencies (rtx insn, rtx jump)
+{
+ do
+ {
+ insn = NEXT_INSN (insn);
+ if (insn == jump)
+ break;
+
+ if (sd_lists_empty_p (insn, SD_LIST_FORW))
+ {
+ dep_def _new_dep, *new_dep = &_new_dep;
+
+ init_dep (new_dep, insn, jump, REG_DEP_ANTI);
+ sd_add_dep (new_dep, false);
+ }
+ }
+ while (1);
+
+ gcc_assert (!sd_lists_empty_p (jump, SD_LIST_BACK));
+}
+
+/* Return the NOTE_INSN_BASIC_BLOCK of BB. */
+rtx
+bb_note (basic_block bb)
+{
+ rtx note;
+
+ note = BB_HEAD (bb);
+ if (LABEL_P (note))
+ note = NEXT_INSN (note);
+
+ gcc_assert (NOTE_INSN_BASIC_BLOCK_P (note));
+ return note;
+}
+
+#ifdef ENABLE_CHECKING
+/* Helper function for check_cfg.
+ Return nonzero, if edge vector pointed to by EL has edge with TYPE in
+ its flags. */
+static int
+has_edge_p (VEC(edge,gc) *el, int type)
+{
+ edge e;
+ edge_iterator ei;
+
+ FOR_EACH_EDGE (e, ei, el)
+ if (e->flags & type)
+ return 1;
+ return 0;
+}
+
+/* Check few properties of CFG between HEAD and TAIL.
+ If HEAD (TAIL) is NULL check from the beginning (till the end) of the
+ instruction stream. */
+static void
+check_cfg (rtx head, rtx tail)
+{
+ rtx next_tail;
+ basic_block bb = 0;
+ int not_first = 0, not_last;
+
+ if (head == NULL)
+ head = get_insns ();
+ if (tail == NULL)
+ tail = get_last_insn ();
+ next_tail = NEXT_INSN (tail);
+
+ do
+ {
+ not_last = head != tail;
+
+ if (not_first)
+ gcc_assert (NEXT_INSN (PREV_INSN (head)) == head);
+ if (not_last)
+ gcc_assert (PREV_INSN (NEXT_INSN (head)) == head);
+
+ if (LABEL_P (head)
+ || (NOTE_INSN_BASIC_BLOCK_P (head)
+ && (!not_first
+ || (not_first && !LABEL_P (PREV_INSN (head))))))
+ {
+ gcc_assert (bb == 0);
+ bb = BLOCK_FOR_INSN (head);
+ if (bb != 0)
+ gcc_assert (BB_HEAD (bb) == head);
+ else
+ /* This is the case of jump table. See inside_basic_block_p (). */
+ gcc_assert (LABEL_P (head) && !inside_basic_block_p (head));
+ }
+
+ if (bb == 0)
+ {
+ gcc_assert (!inside_basic_block_p (head));
+ head = NEXT_INSN (head);
+ }
+ else
+ {
+ gcc_assert (inside_basic_block_p (head)
+ || NOTE_P (head));
+ gcc_assert (BLOCK_FOR_INSN (head) == bb);
+
+ if (LABEL_P (head))
+ {
+ head = NEXT_INSN (head);
+ gcc_assert (NOTE_INSN_BASIC_BLOCK_P (head));
+ }
+ else
+ {
+ if (control_flow_insn_p (head))
+ {
+ gcc_assert (BB_END (bb) == head);
+
+ if (any_uncondjump_p (head))
+ gcc_assert (EDGE_COUNT (bb->succs) == 1
+ && BARRIER_P (NEXT_INSN (head)));
+ else if (any_condjump_p (head))
+ gcc_assert (/* Usual case. */
+ (EDGE_COUNT (bb->succs) > 1
+ && !BARRIER_P (NEXT_INSN (head)))
+ /* Or jump to the next instruction. */
+ || (EDGE_COUNT (bb->succs) == 1
+ && (BB_HEAD (EDGE_I (bb->succs, 0)->dest)
+ == JUMP_LABEL (head))));
+ }
+ if (BB_END (bb) == head)
+ {
+ if (EDGE_COUNT (bb->succs) > 1)
+ gcc_assert (control_flow_insn_p (head)
+ || has_edge_p (bb->succs, EDGE_COMPLEX));
+ bb = 0;
+ }
+
+ head = NEXT_INSN (head);
+ }
+ }
+
+ not_first = 1;
+ }
+ while (head != next_tail);
+
+ gcc_assert (bb == 0);
}
+#endif /* ENABLE_CHECKING */
#endif /* INSN_SCHEDULING */
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