blob: 5814204c681bc9d2336c4bcf29d2fcc7b4e6a68b [file] [log] [blame]
/* Instruction scheduling pass. This file computes dependencies between
instructions.
Copyright (C) 1992-2021 Free Software Foundation, Inc.
Contributed by Michael Tiemann (tiemann@cygnus.com) Enhanced by,
and currently maintained by, Jim Wilson (wilson@cygnus.com)
This file is part of GCC.
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 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "target.h"
#include "rtl.h"
#include "tree.h"
#include "df.h"
#include "insn-config.h"
#include "regs.h"
#include "memmodel.h"
#include "ira.h"
#include "ira-int.h"
#include "insn-attr.h"
#include "cfgbuild.h"
#include "sched-int.h"
#include "cselib.h"
#include "function-abi.h"
#ifdef INSN_SCHEDULING
/* Holds current parameters for the dependency analyzer. */
struct sched_deps_info_def *sched_deps_info;
/* The data is specific to the Haifa scheduler. */
vec<haifa_deps_insn_data_def>
h_d_i_d = vNULL;
/* Return the major type present in the DS. */
enum reg_note
ds_to_dk (ds_t ds)
{
if (ds & DEP_TRUE)
return REG_DEP_TRUE;
if (ds & DEP_OUTPUT)
return REG_DEP_OUTPUT;
if (ds & DEP_CONTROL)
return REG_DEP_CONTROL;
gcc_assert (ds & DEP_ANTI);
return REG_DEP_ANTI;
}
/* Return equivalent dep_status. */
ds_t
dk_to_ds (enum reg_note dk)
{
switch (dk)
{
case REG_DEP_TRUE:
return DEP_TRUE;
case REG_DEP_OUTPUT:
return DEP_OUTPUT;
case REG_DEP_CONTROL:
return DEP_CONTROL;
default:
gcc_assert (dk == REG_DEP_ANTI);
return DEP_ANTI;
}
}
/* Functions to operate with dependence information container - dep_t. */
/* Init DEP with the arguments. */
void
init_dep_1 (dep_t dep, rtx_insn *pro, rtx_insn *con, enum reg_note type, ds_t ds)
{
DEP_PRO (dep) = pro;
DEP_CON (dep) = con;
DEP_TYPE (dep) = type;
DEP_STATUS (dep) = ds;
DEP_COST (dep) = UNKNOWN_DEP_COST;
DEP_NONREG (dep) = 0;
DEP_MULTIPLE (dep) = 0;
DEP_REPLACE (dep) = NULL;
dep->unused = 0;
}
/* Init DEP with the arguments.
While most of the scheduler (including targets) only need the major type
of the dependency, it is convenient to hide full dep_status from them. */
void
init_dep (dep_t dep, rtx_insn *pro, rtx_insn *con, enum reg_note kind)
{
ds_t ds;
if ((current_sched_info->flags & USE_DEPS_LIST))
ds = dk_to_ds (kind);
else
ds = 0;
init_dep_1 (dep, pro, con, kind, ds);
}
/* Make a copy of FROM in TO. */
static void
copy_dep (dep_t to, dep_t from)
{
memcpy (to, from, sizeof (*to));
}
static void dump_ds (FILE *, ds_t);
/* Define flags for dump_dep (). */
/* Dump producer of the dependence. */
#define DUMP_DEP_PRO (2)
/* Dump consumer of the dependence. */
#define DUMP_DEP_CON (4)
/* Dump type of the dependence. */
#define DUMP_DEP_TYPE (8)
/* Dump status of the dependence. */
#define DUMP_DEP_STATUS (16)
/* Dump all information about the dependence. */
#define DUMP_DEP_ALL (DUMP_DEP_PRO | DUMP_DEP_CON | DUMP_DEP_TYPE \
|DUMP_DEP_STATUS)
/* Dump DEP to DUMP.
FLAGS is a bit mask specifying what information about DEP needs
to be printed.
If FLAGS has the very first bit set, then dump all information about DEP
and propagate this bit into the callee dump functions. */
static void
dump_dep (FILE *dump, dep_t dep, int flags)
{
if (flags & 1)
flags |= DUMP_DEP_ALL;
fprintf (dump, "<");
if (flags & DUMP_DEP_PRO)
fprintf (dump, "%d; ", INSN_UID (DEP_PRO (dep)));
if (flags & DUMP_DEP_CON)
fprintf (dump, "%d; ", INSN_UID (DEP_CON (dep)));
if (flags & DUMP_DEP_TYPE)
{
char t;
enum reg_note type = DEP_TYPE (dep);
switch (type)
{
case REG_DEP_TRUE:
t = 't';
break;
case REG_DEP_OUTPUT:
t = 'o';
break;
case REG_DEP_CONTROL:
t = 'c';
break;
case REG_DEP_ANTI:
t = 'a';
break;
default:
gcc_unreachable ();
break;
}
fprintf (dump, "%c; ", t);
}
if (flags & DUMP_DEP_STATUS)
{
if (current_sched_info->flags & USE_DEPS_LIST)
dump_ds (dump, DEP_STATUS (dep));
}
fprintf (dump, ">");
}
/* Default flags for dump_dep (). */
static int dump_dep_flags = (DUMP_DEP_PRO | DUMP_DEP_CON);
/* Dump all fields of DEP to STDERR. */
void
sd_debug_dep (dep_t dep)
{
dump_dep (stderr, dep, 1);
fprintf (stderr, "\n");
}
/* Determine whether DEP is a dependency link of a non-debug insn on a
debug insn. */
static inline bool
depl_on_debug_p (dep_link_t dep)
{
return (DEBUG_INSN_P (DEP_LINK_PRO (dep))
&& !DEBUG_INSN_P (DEP_LINK_CON (dep)));
}
/* Functions to operate with a single link from the dependencies lists -
dep_link_t. */
/* Attach L to appear after link X whose &DEP_LINK_NEXT (X) is given by
PREV_NEXT_P. */
static void
attach_dep_link (dep_link_t l, dep_link_t *prev_nextp)
{
dep_link_t next = *prev_nextp;
gcc_assert (DEP_LINK_PREV_NEXTP (l) == NULL
&& DEP_LINK_NEXT (l) == NULL);
/* Init node being inserted. */
DEP_LINK_PREV_NEXTP (l) = prev_nextp;
DEP_LINK_NEXT (l) = next;
/* Fix next node. */
if (next != NULL)
{
gcc_assert (DEP_LINK_PREV_NEXTP (next) == prev_nextp);
DEP_LINK_PREV_NEXTP (next) = &DEP_LINK_NEXT (l);
}
/* Fix prev node. */
*prev_nextp = l;
}
/* Add dep_link LINK to deps_list L. */
static void
add_to_deps_list (dep_link_t link, deps_list_t l)
{
attach_dep_link (link, &DEPS_LIST_FIRST (l));
/* Don't count debug deps. */
if (!depl_on_debug_p (link))
++DEPS_LIST_N_LINKS (l);
}
/* Detach dep_link L from the list. */
static void
detach_dep_link (dep_link_t l)
{
dep_link_t *prev_nextp = DEP_LINK_PREV_NEXTP (l);
dep_link_t next = DEP_LINK_NEXT (l);
*prev_nextp = next;
if (next != NULL)
DEP_LINK_PREV_NEXTP (next) = prev_nextp;
DEP_LINK_PREV_NEXTP (l) = NULL;
DEP_LINK_NEXT (l) = NULL;
}
/* Remove link LINK from list LIST. */
static void
remove_from_deps_list (dep_link_t link, deps_list_t list)
{
detach_dep_link (link);
/* Don't count debug deps. */
if (!depl_on_debug_p (link))
--DEPS_LIST_N_LINKS (list);
}
/* Move link LINK from list FROM to list TO. */
static void
move_dep_link (dep_link_t link, deps_list_t from, deps_list_t to)
{
remove_from_deps_list (link, from);
add_to_deps_list (link, to);
}
/* Return true of LINK is not attached to any list. */
static bool
dep_link_is_detached_p (dep_link_t link)
{
return DEP_LINK_PREV_NEXTP (link) == NULL;
}
/* Pool to hold all dependency nodes (dep_node_t). */
static object_allocator<_dep_node> *dn_pool;
/* Number of dep_nodes out there. */
static int dn_pool_diff = 0;
/* Create a dep_node. */
static dep_node_t
create_dep_node (void)
{
dep_node_t n = dn_pool->allocate ();
dep_link_t back = DEP_NODE_BACK (n);
dep_link_t forw = DEP_NODE_FORW (n);
DEP_LINK_NODE (back) = n;
DEP_LINK_NEXT (back) = NULL;
DEP_LINK_PREV_NEXTP (back) = NULL;
DEP_LINK_NODE (forw) = n;
DEP_LINK_NEXT (forw) = NULL;
DEP_LINK_PREV_NEXTP (forw) = NULL;
++dn_pool_diff;
return n;
}
/* Delete dep_node N. N must not be connected to any deps_list. */
static void
delete_dep_node (dep_node_t n)
{
gcc_assert (dep_link_is_detached_p (DEP_NODE_BACK (n))
&& dep_link_is_detached_p (DEP_NODE_FORW (n)));
XDELETE (DEP_REPLACE (DEP_NODE_DEP (n)));
--dn_pool_diff;
dn_pool->remove (n);
}
/* Pool to hold dependencies lists (deps_list_t). */
static object_allocator<_deps_list> *dl_pool;
/* Number of deps_lists out there. */
static int dl_pool_diff = 0;
/* Functions to operate with dependences lists - deps_list_t. */
/* Return true if list L is empty. */
static bool
deps_list_empty_p (deps_list_t l)
{
return DEPS_LIST_N_LINKS (l) == 0;
}
/* Create a new deps_list. */
static deps_list_t
create_deps_list (void)
{
deps_list_t l = dl_pool->allocate ();
DEPS_LIST_FIRST (l) = NULL;
DEPS_LIST_N_LINKS (l) = 0;
++dl_pool_diff;
return l;
}
/* Free deps_list L. */
static void
free_deps_list (deps_list_t l)
{
gcc_assert (deps_list_empty_p (l));
--dl_pool_diff;
dl_pool->remove (l);
}
/* Return true if there is no dep_nodes and deps_lists out there.
After the region is scheduled all the dependency nodes and lists
should [generally] be returned to pool. */
bool
deps_pools_are_empty_p (void)
{
return dn_pool_diff == 0 && dl_pool_diff == 0;
}
/* Remove all elements from L. */
static void
clear_deps_list (deps_list_t l)
{
do
{
dep_link_t link = DEPS_LIST_FIRST (l);
if (link == NULL)
break;
remove_from_deps_list (link, l);
}
while (1);
}
/* Decide whether a dependency should be treated as a hard or a speculative
dependency. */
static bool
dep_spec_p (dep_t dep)
{
if (current_sched_info->flags & DO_SPECULATION)
{
if (DEP_STATUS (dep) & SPECULATIVE)
return true;
}
if (current_sched_info->flags & DO_PREDICATION)
{
if (DEP_TYPE (dep) == REG_DEP_CONTROL)
return true;
}
if (DEP_REPLACE (dep) != NULL)
return true;
return false;
}
static regset reg_pending_sets;
static regset reg_pending_clobbers;
static regset reg_pending_uses;
static regset reg_pending_control_uses;
static enum reg_pending_barrier_mode reg_pending_barrier;
/* Hard registers implicitly clobbered or used (or may be implicitly
clobbered or used) by the currently analyzed insn. For example,
insn in its constraint has one register class. Even if there is
currently no hard register in the insn, the particular hard
register will be in the insn after reload pass because the
constraint requires it. */
static HARD_REG_SET implicit_reg_pending_clobbers;
static HARD_REG_SET implicit_reg_pending_uses;
/* To speed up the test for duplicate dependency links we keep a
record of dependencies created by add_dependence when the average
number of instructions in a basic block is very large.
Studies have shown that there is typically around 5 instructions between
branches for typical C code. So we can make a guess that the average
basic block is approximately 5 instructions long; we will choose 100X
the average size as a very large basic block.
Each insn has associated bitmaps for its dependencies. Each bitmap
has enough entries to represent a dependency on any other insn in
the insn chain. All bitmap for true dependencies cache is
allocated then the rest two ones are also allocated. */
static bitmap true_dependency_cache = NULL;
static bitmap output_dependency_cache = NULL;
static bitmap anti_dependency_cache = NULL;
static bitmap control_dependency_cache = NULL;
static bitmap spec_dependency_cache = NULL;
static int cache_size;
/* True if we should mark added dependencies as a non-register deps. */
static bool mark_as_hard;
static int deps_may_trap_p (const_rtx);
static void add_dependence_1 (rtx_insn *, rtx_insn *, enum reg_note);
static void add_dependence_list (rtx_insn *, rtx_insn_list *, int,
enum reg_note, bool);
static void add_dependence_list_and_free (class deps_desc *, rtx_insn *,
rtx_insn_list **, int, enum reg_note,
bool);
static void delete_all_dependences (rtx_insn *);
static void chain_to_prev_insn (rtx_insn *);
static void flush_pending_lists (class deps_desc *, rtx_insn *, int, int);
static void sched_analyze_1 (class deps_desc *, rtx, rtx_insn *);
static void sched_analyze_2 (class deps_desc *, rtx, rtx_insn *);
static void sched_analyze_insn (class deps_desc *, rtx, rtx_insn *);
static bool sched_has_condition_p (const rtx_insn *);
static int conditions_mutex_p (const_rtx, const_rtx, bool, bool);
static enum DEPS_ADJUST_RESULT maybe_add_or_update_dep_1 (dep_t, bool,
rtx, rtx);
static enum DEPS_ADJUST_RESULT add_or_update_dep_1 (dep_t, bool, rtx, rtx);
static void check_dep (dep_t, bool);
/* Return nonzero if a load of the memory reference MEM can cause a trap. */
static int
deps_may_trap_p (const_rtx mem)
{
const_rtx addr = XEXP (mem, 0);
if (REG_P (addr) && REGNO (addr) >= FIRST_PSEUDO_REGISTER)
{
const_rtx t = get_reg_known_value (REGNO (addr));
if (t)
addr = t;
}
return rtx_addr_can_trap_p (addr);
}
/* Find the condition under which INSN is executed. If REV is not NULL,
it is set to TRUE when the returned comparison should be reversed
to get the actual condition. */
static rtx
sched_get_condition_with_rev_uncached (const rtx_insn *insn, bool *rev)
{
rtx pat = PATTERN (insn);
rtx src;
if (rev)
*rev = false;
if (GET_CODE (pat) == COND_EXEC)
return COND_EXEC_TEST (pat);
if (!any_condjump_p (insn) || !onlyjump_p (insn))
return 0;
src = SET_SRC (pc_set (insn));
if (XEXP (src, 2) == pc_rtx)
return XEXP (src, 0);
else if (XEXP (src, 1) == pc_rtx)
{
rtx cond = XEXP (src, 0);
enum rtx_code revcode = reversed_comparison_code (cond, insn);
if (revcode == UNKNOWN)
return 0;
if (rev)
*rev = true;
return cond;
}
return 0;
}
/* Return the condition under which INSN does not execute (i.e. the
not-taken condition for a conditional branch), or NULL if we cannot
find such a condition. The caller should make a copy of the condition
before using it. */
rtx
sched_get_reverse_condition_uncached (const rtx_insn *insn)
{
bool rev;
rtx cond = sched_get_condition_with_rev_uncached (insn, &rev);
if (cond == NULL_RTX)
return cond;
if (!rev)
{
enum rtx_code revcode = reversed_comparison_code (cond, insn);
cond = gen_rtx_fmt_ee (revcode, GET_MODE (cond),
XEXP (cond, 0),
XEXP (cond, 1));
}
return cond;
}
/* Caching variant of sched_get_condition_with_rev_uncached.
We only do actual work the first time we come here for an insn; the
results are cached in INSN_CACHED_COND and INSN_REVERSE_COND. */
static rtx
sched_get_condition_with_rev (const rtx_insn *insn, bool *rev)
{
bool tmp;
if (INSN_LUID (insn) == 0)
return sched_get_condition_with_rev_uncached (insn, rev);
if (INSN_CACHED_COND (insn) == const_true_rtx)
return NULL_RTX;
if (INSN_CACHED_COND (insn) != NULL_RTX)
{
if (rev)
*rev = INSN_REVERSE_COND (insn);
return INSN_CACHED_COND (insn);
}
INSN_CACHED_COND (insn) = sched_get_condition_with_rev_uncached (insn, &tmp);
INSN_REVERSE_COND (insn) = tmp;
if (INSN_CACHED_COND (insn) == NULL_RTX)
{
INSN_CACHED_COND (insn) = const_true_rtx;
return NULL_RTX;
}
if (rev)
*rev = INSN_REVERSE_COND (insn);
return INSN_CACHED_COND (insn);
}
/* True when we can find a condition under which INSN is executed. */
static bool
sched_has_condition_p (const rtx_insn *insn)
{
return !! sched_get_condition_with_rev (insn, NULL);
}
/* Return nonzero if conditions COND1 and COND2 can never be both true. */
static int
conditions_mutex_p (const_rtx cond1, const_rtx cond2, bool rev1, bool rev2)
{
if (COMPARISON_P (cond1)
&& COMPARISON_P (cond2)
&& GET_CODE (cond1) ==
(rev1==rev2
? reversed_comparison_code (cond2, NULL)
: GET_CODE (cond2))
&& rtx_equal_p (XEXP (cond1, 0), XEXP (cond2, 0))
&& XEXP (cond1, 1) == XEXP (cond2, 1))
return 1;
return 0;
}
/* Return true if insn1 and insn2 can never depend on one another because
the conditions under which they are executed are mutually exclusive. */
bool
sched_insns_conditions_mutex_p (const rtx_insn *insn1, const rtx_insn *insn2)
{
rtx cond1, cond2;
bool rev1 = false, rev2 = false;
/* df doesn't handle conditional lifetimes entirely correctly;
calls mess up the conditional lifetimes. */
if (!CALL_P (insn1) && !CALL_P (insn2))
{
cond1 = sched_get_condition_with_rev (insn1, &rev1);
cond2 = sched_get_condition_with_rev (insn2, &rev2);
if (cond1 && cond2
&& conditions_mutex_p (cond1, cond2, rev1, rev2)
/* Make sure first instruction doesn't affect condition of second
instruction if switched. */
&& !modified_in_p (cond1, insn2)
/* Make sure second instruction doesn't affect condition of first
instruction if switched. */
&& !modified_in_p (cond2, insn1))
return true;
}
return false;
}
/* Return true if INSN can potentially be speculated with type DS. */
bool
sched_insn_is_legitimate_for_speculation_p (const rtx_insn *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 (CONST_CAST_RTX_INSN (insn)))
return false;
if (side_effects_p (PATTERN (insn)))
return false;
if (ds & BE_IN_SPEC)
/* The following instructions, which depend on a speculatively scheduled
instruction, cannot be speculatively scheduled along. */
{
if (may_trap_or_fault_p (PATTERN (insn)))
/* If instruction might fault, it cannot be speculatively scheduled.
For control speculation it's obvious why and for data speculation
it's because the insn might get wrong input if speculation
wasn't successful. */
return false;
if ((ds & BE_IN_DATA)
&& sched_has_condition_p (insn))
/* If this is a predicated instruction, then it cannot be
speculatively scheduled. See PR35659. */
return false;
}
return true;
}
/* Initialize LIST_PTR to point to one of the lists present in TYPES_PTR,
initialize RESOLVED_P_PTR with true if that list consists of resolved deps,
and remove the type of returned [through LIST_PTR] list from TYPES_PTR.
This function is used to switch sd_iterator to the next list.
!!! For internal use only. Might consider moving it to sched-int.h. */
void
sd_next_list (const_rtx insn, sd_list_types_def *types_ptr,
deps_list_t *list_ptr, bool *resolved_p_ptr)
{
sd_list_types_def types = *types_ptr;
if (types & SD_LIST_HARD_BACK)
{
*list_ptr = INSN_HARD_BACK_DEPS (insn);
*resolved_p_ptr = false;
*types_ptr = types & ~SD_LIST_HARD_BACK;
}
else if (types & SD_LIST_SPEC_BACK)
{
*list_ptr = INSN_SPEC_BACK_DEPS (insn);
*resolved_p_ptr = false;
*types_ptr = types & ~SD_LIST_SPEC_BACK;
}
else if (types & SD_LIST_FORW)
{
*list_ptr = INSN_FORW_DEPS (insn);
*resolved_p_ptr = false;
*types_ptr = types & ~SD_LIST_FORW;
}
else if (types & SD_LIST_RES_BACK)
{
*list_ptr = INSN_RESOLVED_BACK_DEPS (insn);
*resolved_p_ptr = true;
*types_ptr = types & ~SD_LIST_RES_BACK;
}
else if (types & SD_LIST_RES_FORW)
{
*list_ptr = INSN_RESOLVED_FORW_DEPS (insn);
*resolved_p_ptr = true;
*types_ptr = types & ~SD_LIST_RES_FORW;
}
else
{
*list_ptr = NULL;
*resolved_p_ptr = false;
*types_ptr = SD_LIST_NONE;
}
}
/* Return the summary size of INSN's lists defined by LIST_TYPES. */
int
sd_lists_size (const_rtx insn, sd_list_types_def list_types)
{
int size = 0;
while (list_types != SD_LIST_NONE)
{
deps_list_t list;
bool resolved_p;
sd_next_list (insn, &list_types, &list, &resolved_p);
if (list)
size += DEPS_LIST_N_LINKS (list);
}
return size;
}
/* Return true if INSN's lists defined by LIST_TYPES are all empty. */
bool
sd_lists_empty_p (const_rtx insn, sd_list_types_def list_types)
{
while (list_types != SD_LIST_NONE)
{
deps_list_t list;
bool resolved_p;
sd_next_list (insn, &list_types, &list, &resolved_p);
if (!deps_list_empty_p (list))
return false;
}
return true;
}
/* Initialize data for INSN. */
void
sd_init_insn (rtx_insn *insn)
{
INSN_HARD_BACK_DEPS (insn) = create_deps_list ();
INSN_SPEC_BACK_DEPS (insn) = create_deps_list ();
INSN_RESOLVED_BACK_DEPS (insn) = create_deps_list ();
INSN_FORW_DEPS (insn) = create_deps_list ();
INSN_RESOLVED_FORW_DEPS (insn) = create_deps_list ();
/* ??? It would be nice to allocate dependency caches here. */
}
/* Free data for INSN. */
void
sd_finish_insn (rtx_insn *insn)
{
/* ??? It would be nice to deallocate dependency caches here. */
free_deps_list (INSN_HARD_BACK_DEPS (insn));
INSN_HARD_BACK_DEPS (insn) = NULL;
free_deps_list (INSN_SPEC_BACK_DEPS (insn));
INSN_SPEC_BACK_DEPS (insn) = NULL;
free_deps_list (INSN_RESOLVED_BACK_DEPS (insn));
INSN_RESOLVED_BACK_DEPS (insn) = NULL;
free_deps_list (INSN_FORW_DEPS (insn));
INSN_FORW_DEPS (insn) = NULL;
free_deps_list (INSN_RESOLVED_FORW_DEPS (insn));
INSN_RESOLVED_FORW_DEPS (insn) = NULL;
}
/* Find a dependency between producer PRO and consumer CON.
Search through resolved dependency lists if RESOLVED_P is true.
If no such dependency is found return NULL,
otherwise return the dependency and initialize SD_IT_PTR [if it is nonnull]
with an iterator pointing to it. */
static dep_t
sd_find_dep_between_no_cache (rtx pro, rtx con, bool resolved_p,
sd_iterator_def *sd_it_ptr)
{
sd_list_types_def pro_list_type;
sd_list_types_def con_list_type;
sd_iterator_def sd_it;
dep_t dep;
bool found_p = false;
if (resolved_p)
{
pro_list_type = SD_LIST_RES_FORW;
con_list_type = SD_LIST_RES_BACK;
}
else
{
pro_list_type = SD_LIST_FORW;
con_list_type = SD_LIST_BACK;
}
/* Walk through either back list of INSN or forw list of ELEM
depending on which one is shorter. */
if (sd_lists_size (con, con_list_type) < sd_lists_size (pro, pro_list_type))
{
/* Find the dep_link with producer PRO in consumer's back_deps. */
FOR_EACH_DEP (con, con_list_type, sd_it, dep)
if (DEP_PRO (dep) == pro)
{
found_p = true;
break;
}
}
else
{
/* Find the dep_link with consumer CON in producer's forw_deps. */
FOR_EACH_DEP (pro, pro_list_type, sd_it, dep)
if (DEP_CON (dep) == con)
{
found_p = true;
break;
}
}
if (found_p)
{
if (sd_it_ptr != NULL)
*sd_it_ptr = sd_it;
return dep;
}
return NULL;
}
/* Find a dependency between producer PRO and consumer CON.
Use dependency [if available] to check if dependency is present at all.
Search through resolved dependency lists if RESOLVED_P is true.
If the dependency or NULL if none found. */
dep_t
sd_find_dep_between (rtx pro, rtx con, bool resolved_p)
{
if (true_dependency_cache != NULL)
/* Avoiding the list walk below can cut compile times dramatically
for some code. */
{
int elem_luid = INSN_LUID (pro);
int insn_luid = INSN_LUID (con);
if (!bitmap_bit_p (&true_dependency_cache[insn_luid], elem_luid)
&& !bitmap_bit_p (&output_dependency_cache[insn_luid], elem_luid)
&& !bitmap_bit_p (&anti_dependency_cache[insn_luid], elem_luid)
&& !bitmap_bit_p (&control_dependency_cache[insn_luid], elem_luid))
return NULL;
}
return sd_find_dep_between_no_cache (pro, con, resolved_p, NULL);
}
/* Add or update a dependence described by DEP.
MEM1 and MEM2, if non-null, correspond to memory locations in case of
data speculation.
The function returns a value indicating if an old entry has been changed
or a new entry has been added to insn's backward deps.
This function merely checks if producer and consumer is the same insn
and doesn't create a dep in this case. Actual manipulation of
dependence data structures is performed in add_or_update_dep_1. */
static enum DEPS_ADJUST_RESULT
maybe_add_or_update_dep_1 (dep_t dep, bool resolved_p, rtx mem1, rtx mem2)
{
rtx_insn *elem = DEP_PRO (dep);
rtx_insn *insn = DEP_CON (dep);
gcc_assert (INSN_P (insn) && INSN_P (elem));
/* Don't depend an insn on itself. */
if (insn == elem)
{
if (sched_deps_info->generate_spec_deps)
/* INSN has an internal dependence, which we can't overcome. */
HAS_INTERNAL_DEP (insn) = 1;
return DEP_NODEP;
}
return add_or_update_dep_1 (dep, resolved_p, mem1, mem2);
}
/* Ask dependency caches what needs to be done for dependence DEP.
Return DEP_CREATED if new dependence should be created and there is no
need to try to find one searching the dependencies lists.
Return DEP_PRESENT if there already is a dependence described by DEP and
hence nothing is to be done.
Return DEP_CHANGED if there already is a dependence, but it should be
updated to incorporate additional information from DEP. */
static enum DEPS_ADJUST_RESULT
ask_dependency_caches (dep_t dep)
{
int elem_luid = INSN_LUID (DEP_PRO (dep));
int insn_luid = INSN_LUID (DEP_CON (dep));
gcc_assert (true_dependency_cache != NULL
&& output_dependency_cache != NULL
&& anti_dependency_cache != NULL
&& control_dependency_cache != NULL);
if (!(current_sched_info->flags & USE_DEPS_LIST))
{
enum reg_note present_dep_type;
if (bitmap_bit_p (&true_dependency_cache[insn_luid], elem_luid))
present_dep_type = REG_DEP_TRUE;
else if (bitmap_bit_p (&output_dependency_cache[insn_luid], elem_luid))
present_dep_type = REG_DEP_OUTPUT;
else if (bitmap_bit_p (&anti_dependency_cache[insn_luid], elem_luid))
present_dep_type = REG_DEP_ANTI;
else if (bitmap_bit_p (&control_dependency_cache[insn_luid], elem_luid))
present_dep_type = REG_DEP_CONTROL;
else
/* There is no existing dep so it should be created. */
return DEP_CREATED;
if ((int) DEP_TYPE (dep) >= (int) present_dep_type)
/* DEP does not add anything to the existing dependence. */
return DEP_PRESENT;
}
else
{
ds_t present_dep_types = 0;
if (bitmap_bit_p (&true_dependency_cache[insn_luid], elem_luid))
present_dep_types |= DEP_TRUE;
if (bitmap_bit_p (&output_dependency_cache[insn_luid], elem_luid))
present_dep_types |= DEP_OUTPUT;
if (bitmap_bit_p (&anti_dependency_cache[insn_luid], elem_luid))
present_dep_types |= DEP_ANTI;
if (bitmap_bit_p (&control_dependency_cache[insn_luid], elem_luid))
present_dep_types |= DEP_CONTROL;
if (present_dep_types == 0)
/* There is no existing dep so it should be created. */
return DEP_CREATED;
if (!(current_sched_info->flags & DO_SPECULATION)
|| !bitmap_bit_p (&spec_dependency_cache[insn_luid], elem_luid))
{
if ((present_dep_types | (DEP_STATUS (dep) & DEP_TYPES))
== present_dep_types)
/* DEP does not add anything to the existing dependence. */
return DEP_PRESENT;
}
else
{
/* Only true dependencies can be data speculative and
only anti dependencies can be control speculative. */
gcc_assert ((present_dep_types & (DEP_TRUE | DEP_ANTI))
== present_dep_types);
/* if (DEP is SPECULATIVE) then
..we should update DEP_STATUS
else
..we should reset existing dep to non-speculative. */
}
}
return DEP_CHANGED;
}
/* Set dependency caches according to DEP. */
static void
set_dependency_caches (dep_t dep)
{
int elem_luid = INSN_LUID (DEP_PRO (dep));
int insn_luid = INSN_LUID (DEP_CON (dep));
if (!(current_sched_info->flags & USE_DEPS_LIST))
{
switch (DEP_TYPE (dep))
{
case REG_DEP_TRUE:
bitmap_set_bit (&true_dependency_cache[insn_luid], elem_luid);
break;
case REG_DEP_OUTPUT:
bitmap_set_bit (&output_dependency_cache[insn_luid], elem_luid);
break;
case REG_DEP_ANTI:
bitmap_set_bit (&anti_dependency_cache[insn_luid], elem_luid);
break;
case REG_DEP_CONTROL:
bitmap_set_bit (&control_dependency_cache[insn_luid], elem_luid);
break;
default:
gcc_unreachable ();
}
}
else
{
ds_t ds = DEP_STATUS (dep);
if (ds & DEP_TRUE)
bitmap_set_bit (&true_dependency_cache[insn_luid], elem_luid);
if (ds & DEP_OUTPUT)
bitmap_set_bit (&output_dependency_cache[insn_luid], elem_luid);
if (ds & DEP_ANTI)
bitmap_set_bit (&anti_dependency_cache[insn_luid], elem_luid);
if (ds & DEP_CONTROL)
bitmap_set_bit (&control_dependency_cache[insn_luid], elem_luid);
if (ds & SPECULATIVE)
{
gcc_assert (current_sched_info->flags & DO_SPECULATION);
bitmap_set_bit (&spec_dependency_cache[insn_luid], elem_luid);
}
}
}
/* Type of dependence DEP have changed from OLD_TYPE. Update dependency
caches accordingly. */
static void
update_dependency_caches (dep_t dep, enum reg_note old_type)
{
int elem_luid = INSN_LUID (DEP_PRO (dep));
int insn_luid = INSN_LUID (DEP_CON (dep));
/* Clear corresponding cache entry because type of the link
may have changed. Keep them if we use_deps_list. */
if (!(current_sched_info->flags & USE_DEPS_LIST))
{
switch (old_type)
{
case REG_DEP_OUTPUT:
bitmap_clear_bit (&output_dependency_cache[insn_luid], elem_luid);
break;
case REG_DEP_ANTI:
bitmap_clear_bit (&anti_dependency_cache[insn_luid], elem_luid);
break;
case REG_DEP_CONTROL:
bitmap_clear_bit (&control_dependency_cache[insn_luid], elem_luid);
break;
default:
gcc_unreachable ();
}
}
set_dependency_caches (dep);
}
/* Convert a dependence pointed to by SD_IT to be non-speculative. */
static void
change_spec_dep_to_hard (sd_iterator_def sd_it)
{
dep_node_t node = DEP_LINK_NODE (*sd_it.linkp);
dep_link_t link = DEP_NODE_BACK (node);
dep_t dep = DEP_NODE_DEP (node);
rtx_insn *elem = DEP_PRO (dep);
rtx_insn *insn = DEP_CON (dep);
move_dep_link (link, INSN_SPEC_BACK_DEPS (insn), INSN_HARD_BACK_DEPS (insn));
DEP_STATUS (dep) &= ~SPECULATIVE;
if (true_dependency_cache != NULL)
/* Clear the cache entry. */
bitmap_clear_bit (&spec_dependency_cache[INSN_LUID (insn)],
INSN_LUID (elem));
}
/* Update DEP to incorporate information from NEW_DEP.
SD_IT points to DEP in case it should be moved to another list.
MEM1 and MEM2, if nonnull, correspond to memory locations in case if
data-speculative dependence should be updated. */
static enum DEPS_ADJUST_RESULT
update_dep (dep_t dep, dep_t new_dep,
sd_iterator_def sd_it ATTRIBUTE_UNUSED,
rtx mem1 ATTRIBUTE_UNUSED,
rtx mem2 ATTRIBUTE_UNUSED)
{
enum DEPS_ADJUST_RESULT res = DEP_PRESENT;
enum reg_note old_type = DEP_TYPE (dep);
bool was_spec = dep_spec_p (dep);
DEP_NONREG (dep) |= DEP_NONREG (new_dep);
DEP_MULTIPLE (dep) = 1;
/* If this is a more restrictive type of dependence than the
existing one, then change the existing dependence to this
type. */
if ((int) DEP_TYPE (new_dep) < (int) old_type)
{
DEP_TYPE (dep) = DEP_TYPE (new_dep);
res = DEP_CHANGED;
}
if (current_sched_info->flags & USE_DEPS_LIST)
/* Update DEP_STATUS. */
{
ds_t dep_status = DEP_STATUS (dep);
ds_t ds = DEP_STATUS (new_dep);
ds_t new_status = ds | dep_status;
if (new_status & SPECULATIVE)
{
/* Either existing dep or a dep we're adding or both are
speculative. */
if (!(ds & SPECULATIVE)
|| !(dep_status & SPECULATIVE))
/* The new dep can't be speculative. */
new_status &= ~SPECULATIVE;
else
{
/* Both are speculative. Merge probabilities. */
if (mem1 != NULL)
{
dw_t dw;
dw = estimate_dep_weak (mem1, mem2);
ds = set_dep_weak (ds, BEGIN_DATA, dw);
}
new_status = ds_merge (dep_status, ds);
}
}
ds = new_status;
if (dep_status != ds)
{
DEP_STATUS (dep) = ds;
res = DEP_CHANGED;
}
}
if (was_spec && !dep_spec_p (dep))
/* The old dep was speculative, but now it isn't. */
change_spec_dep_to_hard (sd_it);
if (true_dependency_cache != NULL
&& res == DEP_CHANGED)
update_dependency_caches (dep, old_type);
return res;
}
/* Add or update a dependence described by DEP.
MEM1 and MEM2, if non-null, correspond to memory locations in case of
data speculation.
The function returns a value indicating if an old entry has been changed
or a new entry has been added to insn's backward deps or nothing has
been updated at all. */
static enum DEPS_ADJUST_RESULT
add_or_update_dep_1 (dep_t new_dep, bool resolved_p,
rtx mem1 ATTRIBUTE_UNUSED, rtx mem2 ATTRIBUTE_UNUSED)
{
bool maybe_present_p = true;
bool present_p = false;
gcc_assert (INSN_P (DEP_PRO (new_dep)) && INSN_P (DEP_CON (new_dep))
&& DEP_PRO (new_dep) != DEP_CON (new_dep));
if (flag_checking)
check_dep (new_dep, mem1 != NULL);
if (true_dependency_cache != NULL)
{
switch (ask_dependency_caches (new_dep))
{
case DEP_PRESENT:
dep_t present_dep;
sd_iterator_def sd_it;
present_dep = sd_find_dep_between_no_cache (DEP_PRO (new_dep),
DEP_CON (new_dep),
resolved_p, &sd_it);
DEP_MULTIPLE (present_dep) = 1;
return DEP_PRESENT;
case DEP_CHANGED:
maybe_present_p = true;
present_p = true;
break;
case DEP_CREATED:
maybe_present_p = false;
present_p = false;
break;
default:
gcc_unreachable ();
break;
}
}
/* Check that we don't already have this dependence. */
if (maybe_present_p)
{
dep_t present_dep;
sd_iterator_def sd_it;
gcc_assert (true_dependency_cache == NULL || present_p);
present_dep = sd_find_dep_between_no_cache (DEP_PRO (new_dep),
DEP_CON (new_dep),
resolved_p, &sd_it);
if (present_dep != NULL)
/* We found an existing dependency between ELEM and INSN. */
return update_dep (present_dep, new_dep, sd_it, mem1, mem2);
else
/* We didn't find a dep, it shouldn't present in the cache. */
gcc_assert (!present_p);
}
/* Might want to check one level of transitivity to save conses.
This check should be done in maybe_add_or_update_dep_1.
Since we made it to add_or_update_dep_1, we must create
(or update) a link. */
if (mem1 != NULL_RTX)
{
gcc_assert (sched_deps_info->generate_spec_deps);
DEP_STATUS (new_dep) = set_dep_weak (DEP_STATUS (new_dep), BEGIN_DATA,
estimate_dep_weak (mem1, mem2));
}
sd_add_dep (new_dep, resolved_p);
return DEP_CREATED;
}
/* Initialize BACK_LIST_PTR with consumer's backward list and
FORW_LIST_PTR with producer's forward list. If RESOLVED_P is true
initialize with lists that hold resolved deps. */
static void
get_back_and_forw_lists (dep_t dep, bool resolved_p,
deps_list_t *back_list_ptr,
deps_list_t *forw_list_ptr)
{
rtx_insn *con = DEP_CON (dep);
if (!resolved_p)
{
if (dep_spec_p (dep))
*back_list_ptr = INSN_SPEC_BACK_DEPS (con);
else
*back_list_ptr = INSN_HARD_BACK_DEPS (con);
*forw_list_ptr = INSN_FORW_DEPS (DEP_PRO (dep));
}
else
{
*back_list_ptr = INSN_RESOLVED_BACK_DEPS (con);
*forw_list_ptr = INSN_RESOLVED_FORW_DEPS (DEP_PRO (dep));
}
}
/* Add dependence described by DEP.
If RESOLVED_P is true treat the dependence as a resolved one. */
void
sd_add_dep (dep_t dep, bool resolved_p)
{
dep_node_t n = create_dep_node ();
deps_list_t con_back_deps;
deps_list_t pro_forw_deps;
rtx_insn *elem = DEP_PRO (dep);
rtx_insn *insn = DEP_CON (dep);
gcc_assert (INSN_P (insn) && INSN_P (elem) && insn != elem);
if ((current_sched_info->flags & DO_SPECULATION) == 0
|| !sched_insn_is_legitimate_for_speculation_p (insn, DEP_STATUS (dep)))
DEP_STATUS (dep) &= ~SPECULATIVE;
copy_dep (DEP_NODE_DEP (n), dep);
get_back_and_forw_lists (dep, resolved_p, &con_back_deps, &pro_forw_deps);
add_to_deps_list (DEP_NODE_BACK (n), con_back_deps);
if (flag_checking)
check_dep (dep, false);
add_to_deps_list (DEP_NODE_FORW (n), pro_forw_deps);
/* If we are adding a dependency to INSN's LOG_LINKs, then note that
in the bitmap caches of dependency information. */
if (true_dependency_cache != NULL)
set_dependency_caches (dep);
}
/* Add or update backward dependence between INSN and ELEM
with given type DEP_TYPE and dep_status DS.
This function is a convenience wrapper. */
enum DEPS_ADJUST_RESULT
sd_add_or_update_dep (dep_t dep, bool resolved_p)
{
return add_or_update_dep_1 (dep, resolved_p, NULL_RTX, NULL_RTX);
}
/* Resolved dependence pointed to by SD_IT.
SD_IT will advance to the next element. */
void
sd_resolve_dep (sd_iterator_def sd_it)
{
dep_node_t node = DEP_LINK_NODE (*sd_it.linkp);
dep_t dep = DEP_NODE_DEP (node);
rtx_insn *pro = DEP_PRO (dep);
rtx_insn *con = DEP_CON (dep);
if (dep_spec_p (dep))
move_dep_link (DEP_NODE_BACK (node), INSN_SPEC_BACK_DEPS (con),
INSN_RESOLVED_BACK_DEPS (con));
else
move_dep_link (DEP_NODE_BACK (node), INSN_HARD_BACK_DEPS (con),
INSN_RESOLVED_BACK_DEPS (con));
move_dep_link (DEP_NODE_FORW (node), INSN_FORW_DEPS (pro),
INSN_RESOLVED_FORW_DEPS (pro));
}
/* Perform the inverse operation of sd_resolve_dep. Restore the dependence
pointed to by SD_IT to unresolved state. */
void
sd_unresolve_dep (sd_iterator_def sd_it)
{
dep_node_t node = DEP_LINK_NODE (*sd_it.linkp);
dep_t dep = DEP_NODE_DEP (node);
rtx_insn *pro = DEP_PRO (dep);
rtx_insn *con = DEP_CON (dep);
if (dep_spec_p (dep))
move_dep_link (DEP_NODE_BACK (node), INSN_RESOLVED_BACK_DEPS (con),
INSN_SPEC_BACK_DEPS (con));
else
move_dep_link (DEP_NODE_BACK (node), INSN_RESOLVED_BACK_DEPS (con),
INSN_HARD_BACK_DEPS (con));
move_dep_link (DEP_NODE_FORW (node), INSN_RESOLVED_FORW_DEPS (pro),
INSN_FORW_DEPS (pro));
}
/* Make TO depend on all the FROM's producers.
If RESOLVED_P is true add dependencies to the resolved lists. */
void
sd_copy_back_deps (rtx_insn *to, rtx_insn *from, bool resolved_p)
{
sd_list_types_def list_type;
sd_iterator_def sd_it;
dep_t dep;
list_type = resolved_p ? SD_LIST_RES_BACK : SD_LIST_BACK;
FOR_EACH_DEP (from, list_type, sd_it, dep)
{
dep_def _new_dep, *new_dep = &_new_dep;
copy_dep (new_dep, dep);
DEP_CON (new_dep) = to;
sd_add_dep (new_dep, resolved_p);
}
}
/* Remove a dependency referred to by SD_IT.
SD_IT will point to the next dependence after removal. */
void
sd_delete_dep (sd_iterator_def sd_it)
{
dep_node_t n = DEP_LINK_NODE (*sd_it.linkp);
dep_t dep = DEP_NODE_DEP (n);
rtx_insn *pro = DEP_PRO (dep);
rtx_insn *con = DEP_CON (dep);
deps_list_t con_back_deps;
deps_list_t pro_forw_deps;
if (true_dependency_cache != NULL)
{
int elem_luid = INSN_LUID (pro);
int insn_luid = INSN_LUID (con);
bitmap_clear_bit (&true_dependency_cache[insn_luid], elem_luid);
bitmap_clear_bit (&anti_dependency_cache[insn_luid], elem_luid);
bitmap_clear_bit (&control_dependency_cache[insn_luid], elem_luid);
bitmap_clear_bit (&output_dependency_cache[insn_luid], elem_luid);
if (current_sched_info->flags & DO_SPECULATION)
bitmap_clear_bit (&spec_dependency_cache[insn_luid], elem_luid);
}
get_back_and_forw_lists (dep, sd_it.resolved_p,
&con_back_deps, &pro_forw_deps);
remove_from_deps_list (DEP_NODE_BACK (n), con_back_deps);
remove_from_deps_list (DEP_NODE_FORW (n), pro_forw_deps);
delete_dep_node (n);
}
/* Dump size of the lists. */
#define DUMP_LISTS_SIZE (2)
/* Dump dependencies of the lists. */
#define DUMP_LISTS_DEPS (4)
/* Dump all information about the lists. */
#define DUMP_LISTS_ALL (DUMP_LISTS_SIZE | DUMP_LISTS_DEPS)
/* Dump deps_lists of INSN specified by TYPES to DUMP.
FLAGS is a bit mask specifying what information about the lists needs
to be printed.
If FLAGS has the very first bit set, then dump all information about
the lists and propagate this bit into the callee dump functions. */
static void
dump_lists (FILE *dump, rtx insn, sd_list_types_def types, int flags)
{
sd_iterator_def sd_it;
dep_t dep;
int all;
all = (flags & 1);
if (all)
flags |= DUMP_LISTS_ALL;
fprintf (dump, "[");
if (flags & DUMP_LISTS_SIZE)
fprintf (dump, "%d; ", sd_lists_size (insn, types));
if (flags & DUMP_LISTS_DEPS)
{
FOR_EACH_DEP (insn, types, sd_it, dep)
{
dump_dep (dump, dep, dump_dep_flags | all);
fprintf (dump, " ");
}
}
}
/* Dump all information about deps_lists of INSN specified by TYPES
to STDERR. */
void
sd_debug_lists (rtx insn, sd_list_types_def types)
{
dump_lists (stderr, insn, types, 1);
fprintf (stderr, "\n");
}
/* A wrapper around add_dependence_1, to add a dependence of CON on
PRO, with type DEP_TYPE. This function implements special handling
for REG_DEP_CONTROL dependencies. For these, we optionally promote
the type to REG_DEP_ANTI if we can determine that predication is
impossible; otherwise we add additional true dependencies on the
INSN_COND_DEPS list of the jump (which PRO must be). */
void
add_dependence (rtx_insn *con, rtx_insn *pro, enum reg_note dep_type)
{
if (dep_type == REG_DEP_CONTROL
&& !(current_sched_info->flags & DO_PREDICATION))
dep_type = REG_DEP_ANTI;
/* A REG_DEP_CONTROL dependence may be eliminated through predication,
so we must also make the insn dependent on the setter of the
condition. */
if (dep_type == REG_DEP_CONTROL)
{
rtx_insn *real_pro = pro;
rtx_insn *other = real_insn_for_shadow (real_pro);
rtx cond;
if (other != NULL_RTX)
real_pro = other;
cond = sched_get_reverse_condition_uncached (real_pro);
/* Verify that the insn does not use a different value in
the condition register than the one that was present at
the jump. */
if (cond == NULL_RTX)
dep_type = REG_DEP_ANTI;
else if (INSN_CACHED_COND (real_pro) == const_true_rtx)
{
HARD_REG_SET uses;
CLEAR_HARD_REG_SET (uses);
note_uses (&PATTERN (con), record_hard_reg_uses, &uses);
if (TEST_HARD_REG_BIT (uses, REGNO (XEXP (cond, 0))))
dep_type = REG_DEP_ANTI;
}
if (dep_type == REG_DEP_CONTROL)
{
if (sched_verbose >= 5)
fprintf (sched_dump, "making DEP_CONTROL for %d\n",
INSN_UID (real_pro));
add_dependence_list (con, INSN_COND_DEPS (real_pro), 0,
REG_DEP_TRUE, false);
}
}
add_dependence_1 (con, pro, dep_type);
}
/* A convenience wrapper to operate on an entire list. HARD should be
true if DEP_NONREG should be set on newly created dependencies. */
static void
add_dependence_list (rtx_insn *insn, rtx_insn_list *list, int uncond,
enum reg_note dep_type, bool hard)
{
mark_as_hard = hard;
for (; list; list = list->next ())
{
if (uncond || ! sched_insns_conditions_mutex_p (insn, list->insn ()))
add_dependence (insn, list->insn (), dep_type);
}
mark_as_hard = false;
}
/* Similar, but free *LISTP at the same time, when the context
is not readonly. HARD should be true if DEP_NONREG should be set on
newly created dependencies. */
static void
add_dependence_list_and_free (class deps_desc *deps, rtx_insn *insn,
rtx_insn_list **listp,
int uncond, enum reg_note dep_type, bool hard)
{
add_dependence_list (insn, *listp, uncond, dep_type, hard);
/* We don't want to short-circuit dependencies involving debug
insns, because they may cause actual dependencies to be
disregarded. */
if (deps->readonly || DEBUG_INSN_P (insn))
return;
free_INSN_LIST_list (listp);
}
/* Remove all occurrences of INSN from LIST. Return the number of
occurrences removed. */
static int
remove_from_dependence_list (rtx_insn *insn, rtx_insn_list **listp)
{
int removed = 0;
while (*listp)
{
if ((*listp)->insn () == insn)
{
remove_free_INSN_LIST_node (listp);
removed++;
continue;
}
listp = (rtx_insn_list **)&XEXP (*listp, 1);
}
return removed;
}
/* Same as above, but process two lists at once. */
static int
remove_from_both_dependence_lists (rtx_insn *insn,
rtx_insn_list **listp,
rtx_expr_list **exprp)
{
int removed = 0;
while (*listp)
{
if (XEXP (*listp, 0) == insn)
{
remove_free_INSN_LIST_node (listp);
remove_free_EXPR_LIST_node (exprp);
removed++;
continue;
}
listp = (rtx_insn_list **)&XEXP (*listp, 1);
exprp = (rtx_expr_list **)&XEXP (*exprp, 1);
}
return removed;
}
/* Clear all dependencies for an insn. */
static void
delete_all_dependences (rtx_insn *insn)
{
sd_iterator_def sd_it;
dep_t dep;
/* The below cycle can be optimized to clear the caches and back_deps
in one call but that would provoke duplication of code from
delete_dep (). */
for (sd_it = sd_iterator_start (insn, SD_LIST_BACK);
sd_iterator_cond (&sd_it, &dep);)
sd_delete_dep (sd_it);
}
/* All insns in a scheduling group except the first should only have
dependencies on the previous insn in the group. So we find the
first instruction in the scheduling group by walking the dependence
chains backwards. Then we add the dependencies for the group to
the previous nonnote insn. */
static void
chain_to_prev_insn (rtx_insn *insn)
{
sd_iterator_def sd_it;
dep_t dep;
rtx_insn *prev_nonnote;
FOR_EACH_DEP (insn, SD_LIST_BACK, sd_it, dep)
{
rtx_insn *i = insn;
rtx_insn *pro = DEP_PRO (dep);
do
{
i = prev_nonnote_insn (i);
if (pro == i)
goto next_link;
} while (SCHED_GROUP_P (i) || DEBUG_INSN_P (i));
if (! sched_insns_conditions_mutex_p (i, pro))
add_dependence (i, pro, DEP_TYPE (dep));
next_link:;
}
delete_all_dependences (insn);
prev_nonnote = prev_nonnote_nondebug_insn (insn);
if (BLOCK_FOR_INSN (insn) == BLOCK_FOR_INSN (prev_nonnote)
&& ! sched_insns_conditions_mutex_p (insn, prev_nonnote))
add_dependence (insn, prev_nonnote, REG_DEP_ANTI);
}
/* Process an insn's memory dependencies. There are four kinds of
dependencies:
(0) read dependence: read follows read
(1) true dependence: read follows write
(2) output dependence: write follows write
(3) anti dependence: write follows read
We are careful to build only dependencies which actually exist, and
use transitivity to avoid building too many links. */
/* Add an INSN and MEM reference pair to a pending INSN_LIST and MEM_LIST.
The MEM is a memory reference contained within INSN, which we are saving
so that we can do memory aliasing on it. */
static void
add_insn_mem_dependence (class deps_desc *deps, bool read_p,
rtx_insn *insn, rtx mem)
{
rtx_insn_list **insn_list;
rtx_insn_list *insn_node;
rtx_expr_list **mem_list;
rtx_expr_list *mem_node;
gcc_assert (!deps->readonly);
if (read_p)
{
insn_list = &deps->pending_read_insns;
mem_list = &deps->pending_read_mems;
if (!DEBUG_INSN_P (insn))
deps->pending_read_list_length++;
}
else
{
insn_list = &deps->pending_write_insns;
mem_list = &deps->pending_write_mems;
deps->pending_write_list_length++;
}
insn_node = alloc_INSN_LIST (insn, *insn_list);
*insn_list = insn_node;
if (sched_deps_info->use_cselib)
{
mem = shallow_copy_rtx (mem);
XEXP (mem, 0) = cselib_subst_to_values_from_insn (XEXP (mem, 0),
GET_MODE (mem), insn);
}
mem_node = alloc_EXPR_LIST (VOIDmode, canon_rtx (mem), *mem_list);
*mem_list = mem_node;
}
/* Make a dependency between every memory reference on the pending lists
and INSN, thus flushing the pending lists. FOR_READ is true if emitting
dependencies for a read operation, similarly with FOR_WRITE. */
static void
flush_pending_lists (class deps_desc *deps, rtx_insn *insn, int for_read,
int for_write)
{
if (for_write)
{
add_dependence_list_and_free (deps, insn, &deps->pending_read_insns,
1, REG_DEP_ANTI, true);
if (!deps->readonly)
{
free_EXPR_LIST_list (&deps->pending_read_mems);
deps->pending_read_list_length = 0;
}
}
add_dependence_list_and_free (deps, insn, &deps->pending_write_insns, 1,
for_read ? REG_DEP_ANTI : REG_DEP_OUTPUT,
true);
add_dependence_list_and_free (deps, insn,
&deps->last_pending_memory_flush, 1,
for_read ? REG_DEP_ANTI : REG_DEP_OUTPUT,
true);
add_dependence_list_and_free (deps, insn, &deps->pending_jump_insns, 1,
REG_DEP_ANTI, true);
if (DEBUG_INSN_P (insn))
{
if (for_write)
free_INSN_LIST_list (&deps->pending_read_insns);
free_INSN_LIST_list (&deps->pending_write_insns);
free_INSN_LIST_list (&deps->last_pending_memory_flush);
free_INSN_LIST_list (&deps->pending_jump_insns);
}
if (!deps->readonly)
{
free_EXPR_LIST_list (&deps->pending_write_mems);
deps->pending_write_list_length = 0;
deps->last_pending_memory_flush = alloc_INSN_LIST (insn, NULL_RTX);
deps->pending_flush_length = 1;
}
mark_as_hard = false;
}
/* Instruction which dependencies we are analyzing. */
static rtx_insn *cur_insn = NULL;
/* Implement hooks for haifa scheduler. */
static void
haifa_start_insn (rtx_insn *insn)
{
gcc_assert (insn && !cur_insn);
cur_insn = insn;
}
static void
haifa_finish_insn (void)
{
cur_insn = NULL;
}
void
haifa_note_reg_set (int regno)
{
SET_REGNO_REG_SET (reg_pending_sets, regno);
}
void
haifa_note_reg_clobber (int regno)
{
SET_REGNO_REG_SET (reg_pending_clobbers, regno);
}
void
haifa_note_reg_use (int regno)
{
SET_REGNO_REG_SET (reg_pending_uses, regno);
}
static void
haifa_note_mem_dep (rtx mem, rtx pending_mem, rtx_insn *pending_insn, ds_t ds)
{
if (!(ds & SPECULATIVE))
{
mem = NULL_RTX;
pending_mem = NULL_RTX;
}
else
gcc_assert (ds & BEGIN_DATA);
{
dep_def _dep, *dep = &_dep;
init_dep_1 (dep, pending_insn, cur_insn, ds_to_dt (ds),
current_sched_info->flags & USE_DEPS_LIST ? ds : 0);
DEP_NONREG (dep) = 1;
maybe_add_or_update_dep_1 (dep, false, pending_mem, mem);
}
}
static void
haifa_note_dep (rtx_insn *elem, ds_t ds)
{
dep_def _dep;
dep_t dep = &_dep;
init_dep (dep, elem, cur_insn, ds_to_dt (ds));
if (mark_as_hard)
DEP_NONREG (dep) = 1;
maybe_add_or_update_dep_1 (dep, false, NULL_RTX, NULL_RTX);
}
static void
note_reg_use (int r)
{
if (sched_deps_info->note_reg_use)
sched_deps_info->note_reg_use (r);
}
static void
note_reg_set (int r)
{
if (sched_deps_info->note_reg_set)
sched_deps_info->note_reg_set (r);
}
static void
note_reg_clobber (int r)
{
if (sched_deps_info->note_reg_clobber)
sched_deps_info->note_reg_clobber (r);
}
static void
note_mem_dep (rtx m1, rtx m2, rtx_insn *e, ds_t ds)
{
if (sched_deps_info->note_mem_dep)
sched_deps_info->note_mem_dep (m1, m2, e, ds);
}
static void
note_dep (rtx_insn *e, ds_t ds)
{
if (sched_deps_info->note_dep)
sched_deps_info->note_dep (e, ds);
}
/* Return corresponding to DS reg_note. */
enum reg_note
ds_to_dt (ds_t ds)
{
if (ds & DEP_TRUE)
return REG_DEP_TRUE;
else if (ds & DEP_OUTPUT)
return REG_DEP_OUTPUT;
else if (ds & DEP_ANTI)
return REG_DEP_ANTI;
else
{
gcc_assert (ds & DEP_CONTROL);
return REG_DEP_CONTROL;
}
}
/* Functions for computation of info needed for register pressure
sensitive insn scheduling. */
/* Allocate and return reg_use_data structure for REGNO and INSN. */
static struct reg_use_data *
create_insn_reg_use (int regno, rtx_insn *insn)
{
struct reg_use_data *use;
use = (struct reg_use_data *) xmalloc (sizeof (struct reg_use_data));
use->regno = regno;
use->insn = insn;
use->next_insn_use = INSN_REG_USE_LIST (insn);
INSN_REG_USE_LIST (insn) = use;
return use;
}
/* Allocate reg_set_data structure for REGNO and INSN. */
static void
create_insn_reg_set (int regno, rtx insn)
{
struct reg_set_data *set;
set = (struct reg_set_data *) xmalloc (sizeof (struct reg_set_data));
set->regno = regno;
set->insn = insn;
set->next_insn_set = INSN_REG_SET_LIST (insn);
INSN_REG_SET_LIST (insn) = set;
}
/* Set up insn register uses for INSN and dependency context DEPS. */
static void
setup_insn_reg_uses (class deps_desc *deps, rtx_insn *insn)
{
unsigned i;
reg_set_iterator rsi;
struct reg_use_data *use, *use2, *next;
struct deps_reg *reg_last;
EXECUTE_IF_SET_IN_REG_SET (reg_pending_uses, 0, i, rsi)
{
if (i < FIRST_PSEUDO_REGISTER
&& TEST_HARD_REG_BIT (ira_no_alloc_regs, i))
continue;
if (find_regno_note (insn, REG_DEAD, i) == NULL_RTX
&& ! REGNO_REG_SET_P (reg_pending_sets, i)
&& ! REGNO_REG_SET_P (reg_pending_clobbers, i))
/* Ignore use which is not dying. */
continue;
use = create_insn_reg_use (i, insn);
use->next_regno_use = use;
reg_last = &deps->reg_last[i];
/* Create the cycle list of uses. */
for (rtx_insn_list *list = reg_last->uses; list; list = list->next ())
{
use2 = create_insn_reg_use (i, list->insn ());
next = use->next_regno_use;
use->next_regno_use = use2;
use2->next_regno_use = next;
}
}
}
/* Register pressure info for the currently processed insn. */
static struct reg_pressure_data reg_pressure_info[N_REG_CLASSES];
/* Return TRUE if INSN has the use structure for REGNO. */
static bool
insn_use_p (rtx insn, int regno)
{
struct reg_use_data *use;
for (use = INSN_REG_USE_LIST (insn); use != NULL; use = use->next_insn_use)
if (use->regno == regno)
return true;
return false;
}
/* Update the register pressure info after birth of pseudo register REGNO
in INSN. Arguments CLOBBER_P and UNUSED_P say correspondingly that
the register is in clobber or unused after the insn. */
static void
mark_insn_pseudo_birth (rtx insn, int regno, bool clobber_p, bool unused_p)
{
int incr, new_incr;
enum reg_class cl;
gcc_assert (regno >= FIRST_PSEUDO_REGISTER);
cl = sched_regno_pressure_class[regno];
if (cl != NO_REGS)
{
incr = ira_reg_class_max_nregs[cl][PSEUDO_REGNO_MODE (regno)];
if (clobber_p)
{
new_incr = reg_pressure_info[cl].clobber_increase + incr;
reg_pressure_info[cl].clobber_increase = new_incr;
}
else if (unused_p)
{
new_incr = reg_pressure_info[cl].unused_set_increase + incr;
reg_pressure_info[cl].unused_set_increase = new_incr;
}
else
{
new_incr = reg_pressure_info[cl].set_increase + incr;
reg_pressure_info[cl].set_increase = new_incr;
if (! insn_use_p (insn, regno))
reg_pressure_info[cl].change += incr;
create_insn_reg_set (regno, insn);
}
gcc_assert (new_incr < (1 << INCREASE_BITS));
}
}
/* Like mark_insn_pseudo_regno_birth except that NREGS saying how many
hard registers involved in the birth. */
static void
mark_insn_hard_regno_birth (rtx insn, int regno, int nregs,
bool clobber_p, bool unused_p)
{
enum reg_class cl;
int new_incr, last = regno + nregs;
while (regno < last)
{
gcc_assert (regno < FIRST_PSEUDO_REGISTER);
if (! TEST_HARD_REG_BIT (ira_no_alloc_regs, regno))
{
cl = sched_regno_pressure_class[regno];
if (cl != NO_REGS)
{
if (clobber_p)
{
new_incr = reg_pressure_info[cl].clobber_increase + 1;
reg_pressure_info[cl].clobber_increase = new_incr;
}
else if (unused_p)
{
new_incr = reg_pressure_info[cl].unused_set_increase + 1;
reg_pressure_info[cl].unused_set_increase = new_incr;
}
else
{
new_incr = reg_pressure_info[cl].set_increase + 1;
reg_pressure_info[cl].set_increase = new_incr;
if (! insn_use_p (insn, regno))
reg_pressure_info[cl].change += 1;
create_insn_reg_set (regno, insn);
}
gcc_assert (new_incr < (1 << INCREASE_BITS));
}
}
regno++;
}
}
/* Update the register pressure info after birth of pseudo or hard
register REG in INSN. Arguments CLOBBER_P and UNUSED_P say
correspondingly that the register is in clobber or unused after the
insn. */
static void
mark_insn_reg_birth (rtx insn, rtx reg, bool clobber_p, bool unused_p)
{
int regno;
if (GET_CODE (reg) == SUBREG)
reg = SUBREG_REG (reg);
if (! REG_P (reg))
return;
regno = REGNO (reg);
if (regno < FIRST_PSEUDO_REGISTER)
mark_insn_hard_regno_birth (insn, regno, REG_NREGS (reg),
clobber_p, unused_p);
else
mark_insn_pseudo_birth (insn, regno, clobber_p, unused_p);
}
/* Update the register pressure info after death of pseudo register
REGNO. */
static void
mark_pseudo_death (int regno)
{
int incr;
enum reg_class cl;
gcc_assert (regno >= FIRST_PSEUDO_REGISTER);
cl = sched_regno_pressure_class[regno];
if (cl != NO_REGS)
{
incr = ira_reg_class_max_nregs[cl][PSEUDO_REGNO_MODE (regno)];
reg_pressure_info[cl].change -= incr;
}
}
/* Like mark_pseudo_death except that NREGS saying how many hard
registers involved in the death. */
static void
mark_hard_regno_death (int regno, int nregs)
{
enum reg_class cl;
int last = regno + nregs;
while (regno < last)
{
gcc_assert (regno < FIRST_PSEUDO_REGISTER);
if (! TEST_HARD_REG_BIT (ira_no_alloc_regs, regno))
{
cl = sched_regno_pressure_class[regno];
if (cl != NO_REGS)
reg_pressure_info[cl].change -= 1;
}
regno++;
}
}
/* Update the register pressure info after death of pseudo or hard
register REG. */
static void
mark_reg_death (rtx reg)
{
int regno;
if (GET_CODE (reg) == SUBREG)
reg = SUBREG_REG (reg);
if (! REG_P (reg))
return;
regno = REGNO (reg);
if (regno < FIRST_PSEUDO_REGISTER)
mark_hard_regno_death (regno, REG_NREGS (reg));
else
mark_pseudo_death (regno);
}
/* Process SETTER of REG. DATA is an insn containing the setter. */
static void
mark_insn_reg_store (rtx reg, const_rtx setter, void *data)
{
if (setter != NULL_RTX && GET_CODE (setter) != SET)
return;
mark_insn_reg_birth
((rtx) data, reg, false,
find_reg_note ((const_rtx) data, REG_UNUSED, reg) != NULL_RTX);
}
/* Like mark_insn_reg_store except notice just CLOBBERs; ignore SETs. */
static void
mark_insn_reg_clobber (rtx reg, const_rtx setter, void *data)
{
if (GET_CODE (setter) == CLOBBER)
mark_insn_reg_birth ((rtx) data, reg, true, false);
}
/* Set up reg pressure info related to INSN. */
void
init_insn_reg_pressure_info (rtx_insn *insn)
{
int i, len;
enum reg_class cl;
static struct reg_pressure_data *pressure_info;
rtx link;
gcc_assert (sched_pressure != SCHED_PRESSURE_NONE);
if (! INSN_P (insn))
return;
for (i = 0; i < ira_pressure_classes_num; i++)
{
cl = ira_pressure_classes[i];
reg_pressure_info[cl].clobber_increase = 0;
reg_pressure_info[cl].set_increase = 0;
reg_pressure_info[cl].unused_set_increase = 0;
reg_pressure_info[cl].change = 0;
}
note_stores (insn, mark_insn_reg_clobber, insn);
note_stores (insn, mark_insn_reg_store, insn);
if (AUTO_INC_DEC)
for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
if (REG_NOTE_KIND (link) == REG_INC)
mark_insn_reg_store (XEXP (link, 0), NULL_RTX, insn);
for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
if (REG_NOTE_KIND (link) == REG_DEAD)
mark_reg_death (XEXP (link, 0));
len = sizeof (struct reg_pressure_data) * ira_pressure_classes_num;
pressure_info
= INSN_REG_PRESSURE (insn) = (struct reg_pressure_data *) xmalloc (len);
if (sched_pressure == SCHED_PRESSURE_WEIGHTED)
INSN_MAX_REG_PRESSURE (insn) = (int *) xcalloc (ira_pressure_classes_num
* sizeof (int), 1);
for (i = 0; i < ira_pressure_classes_num; i++)
{
cl = ira_pressure_classes[i];
pressure_info[i].clobber_increase
= reg_pressure_info[cl].clobber_increase;
pressure_info[i].set_increase = reg_pressure_info[cl].set_increase;
pressure_info[i].unused_set_increase
= reg_pressure_info[cl].unused_set_increase;
pressure_info[i].change = reg_pressure_info[cl].change;
}
}
/* Internal variable for sched_analyze_[12] () functions.
If it is nonzero, this means that sched_analyze_[12] looks
at the most toplevel SET. */
static bool can_start_lhs_rhs_p;
/* Extend reg info for the deps context DEPS given that
we have just generated a register numbered REGNO. */
static void
extend_deps_reg_info (class deps_desc *deps, int regno)
{
int max_regno = regno + 1;
gcc_assert (!reload_completed);
/* In a readonly context, it would not hurt to extend info,
but it should not be needed. */
if (reload_completed && deps->readonly)
{
deps->max_reg = max_regno;
return;
}
if (max_regno > deps->max_reg)
{
deps->reg_last = XRESIZEVEC (struct deps_reg, deps->reg_last,
max_regno);
memset (&deps->reg_last[deps->max_reg],
0, (max_regno - deps->max_reg)
* sizeof (struct deps_reg));
deps->max_reg = max_regno;
}
}
/* Extends REG_INFO_P if needed. */
void
maybe_extend_reg_info_p (void)
{
/* Extend REG_INFO_P, if needed. */
if ((unsigned int)max_regno - 1 >= reg_info_p_size)
{
size_t new_reg_info_p_size = max_regno + 128;
gcc_assert (!reload_completed && sel_sched_p ());
reg_info_p = (struct reg_info_t *) xrecalloc (reg_info_p,
new_reg_info_p_size,
reg_info_p_size,
sizeof (*reg_info_p));
reg_info_p_size = new_reg_info_p_size;
}
}
/* Analyze a single reference to register (reg:MODE REGNO) in INSN.
The type of the reference is specified by REF and can be SET,
CLOBBER, PRE_DEC, POST_DEC, PRE_INC, POST_INC or USE. */
static void
sched_analyze_reg (class deps_desc *deps, int regno, machine_mode mode,
enum rtx_code ref, rtx_insn *insn)
{
/* We could emit new pseudos in renaming. Extend the reg structures. */
if (!reload_completed && sel_sched_p ()
&& (regno >= max_reg_num () - 1 || regno >= deps->max_reg))
extend_deps_reg_info (deps, regno);
maybe_extend_reg_info_p ();
/* A hard reg in a wide mode may really be multiple registers.
If so, mark all of them just like the first. */
if (regno < FIRST_PSEUDO_REGISTER)
{
int i = hard_regno_nregs (regno, mode);
if (ref == SET)
{
while (--i >= 0)
note_reg_set (regno + i);
}
else if (ref == USE)
{
while (--i >= 0)
note_reg_use (regno + i);
}
else
{
while (--i >= 0)
note_reg_clobber (regno + i);
}
}
/* ??? Reload sometimes emits USEs and CLOBBERs of pseudos that
it does not reload. Ignore these as they have served their
purpose already. */
else if (regno >= deps->max_reg)
{
enum rtx_code code = GET_CODE (PATTERN (insn));
gcc_assert (code == USE || code == CLOBBER);
}
else
{
if (ref == SET)
note_reg_set (regno);
else if (ref == USE)
note_reg_use (regno);
else
note_reg_clobber (regno);
/* Pseudos that are REG_EQUIV to something may be replaced
by that during reloading. We need only add dependencies for
the address in the REG_EQUIV note. */
if (!reload_completed && get_reg_known_equiv_p (regno))
{
rtx t = get_reg_known_value (regno);
if (MEM_P (t))
sched_analyze_2 (deps, XEXP (t, 0), insn);
}
/* Don't let it cross a call after scheduling if it doesn't
already cross one. */
if (REG_N_CALLS_CROSSED (regno) == 0)
{
if (!deps->readonly && ref == USE && !DEBUG_INSN_P (insn))
deps->sched_before_next_call
= alloc_INSN_LIST (insn, deps->sched_before_next_call);
else
add_dependence_list (insn, deps->last_function_call, 1,
REG_DEP_ANTI, false);
}
}
}
/* Analyze a single SET, CLOBBER, PRE_DEC, POST_DEC, PRE_INC or POST_INC
rtx, X, creating all dependencies generated by the write to the
destination of X, and reads of everything mentioned. */
static void
sched_analyze_1 (class deps_desc *deps, rtx x, rtx_insn *insn)
{
rtx dest = XEXP (x, 0);
enum rtx_code code = GET_CODE (x);
bool cslr_p = can_start_lhs_rhs_p;
can_start_lhs_rhs_p = false;
gcc_assert (dest);
if (dest == 0)
return;
if (cslr_p && sched_deps_info->start_lhs)
sched_deps_info->start_lhs (dest);
if (GET_CODE (dest) == PARALLEL)
{
int i;
for (i = XVECLEN (dest, 0) - 1; i >= 0; i--)
if (XEXP (XVECEXP (dest, 0, i), 0) != 0)
sched_analyze_1 (deps,
gen_rtx_CLOBBER (VOIDmode,
XEXP (XVECEXP (dest, 0, i), 0)),
insn);
if (cslr_p && sched_deps_info->finish_lhs)
sched_deps_info->finish_lhs ();
if (code == SET)
{
can_start_lhs_rhs_p = cslr_p;
sched_analyze_2 (deps, SET_SRC (x), insn);
can_start_lhs_rhs_p = false;
}
return;
}
while (GET_CODE (dest) == STRICT_LOW_PART || GET_CODE (dest) == SUBREG
|| GET_CODE (dest) == ZERO_EXTRACT)
{
if (GET_CODE (dest) == STRICT_LOW_PART
|| GET_CODE (dest) == ZERO_EXTRACT
|| read_modify_subreg_p (dest))
{
/* These both read and modify the result. We must handle
them as writes to get proper dependencies for following
instructions. We must handle them as reads to get proper
dependencies from this to previous instructions.
Thus we need to call sched_analyze_2. */
sched_analyze_2 (deps, XEXP (dest, 0), insn);
}
if (GET_CODE (dest) == ZERO_EXTRACT)
{
/* The second and third arguments are values read by this insn. */
sched_analyze_2 (deps, XEXP (dest, 1), insn);
sched_analyze_2 (deps, XEXP (dest, 2), insn);
}
dest = XEXP (dest, 0);
}
if (REG_P (dest))
{
int regno = REGNO (dest);
machine_mode mode = GET_MODE (dest);
sched_analyze_reg (deps, regno, mode, code, insn);
#ifdef STACK_REGS
/* Treat all writes to a stack register as modifying the TOS. */
if (regno >= FIRST_STACK_REG && regno <= LAST_STACK_REG)
{
/* Avoid analyzing the same register twice. */
if (regno != FIRST_STACK_REG)
sched_analyze_reg (deps, FIRST_STACK_REG, mode, code, insn);
add_to_hard_reg_set (&implicit_reg_pending_uses, mode,
FIRST_STACK_REG);
}
#endif
}
else if (MEM_P (dest))
{
/* Writing memory. */
rtx t = dest;
if (sched_deps_info->use_cselib)
{
machine_mode address_mode = get_address_mode (dest);
t = shallow_copy_rtx (dest);
cselib_lookup_from_insn (XEXP (t, 0), address_mode, 1,
GET_MODE (t), insn);
XEXP (t, 0)
= cselib_subst_to_values_from_insn (XEXP (t, 0), GET_MODE (t),
insn);
}
t = canon_rtx (t);
/* Pending lists can't get larger with a readonly context. */
if (!deps->readonly
&& ((deps->pending_read_list_length + deps->pending_write_list_length)
>= param_max_pending_list_length))
{
/* Flush all pending reads and writes to prevent the pending lists
from getting any larger. Insn scheduling runs too slowly when
these lists get long. When compiling GCC with itself,
this flush occurs 8 times for sparc, and 10 times for m88k using
the default value of 32. */
flush_pending_lists (deps, insn, false, true);
}
else
{
rtx_insn_list *pending;
rtx_expr_list *pending_mem;
pending = deps->pending_read_insns;
pending_mem = deps->pending_read_mems;
while (pending)
{
if (anti_dependence (pending_mem->element (), t)
&& ! sched_insns_conditions_mutex_p (insn, pending->insn ()))
note_mem_dep (t, pending_mem->element (), pending->insn (),
DEP_ANTI);
pending = pending->next ();
pending_mem = pending_mem->next ();
}
pending = deps->pending_write_insns;
pending_mem = deps->pending_write_mems;
while (pending)
{
if (output_dependence (pending_mem->element (), t)
&& ! sched_insns_conditions_mutex_p (insn, pending->insn ()))
note_mem_dep (t, pending_mem->element (),
pending->insn (),
DEP_OUTPUT);
pending = pending->next ();
pending_mem = pending_mem-> next ();
}
add_dependence_list (insn, deps->last_pending_memory_flush, 1,
REG_DEP_ANTI, true);
add_dependence_list (insn, deps->pending_jump_insns, 1,
REG_DEP_CONTROL, true);
if (!deps->readonly)
add_insn_mem_dependence (deps, false, insn, dest);
}
sched_analyze_2 (deps, XEXP (dest, 0), insn);
}
if (cslr_p && sched_deps_info->finish_lhs)
sched_deps_info->finish_lhs ();
/* Analyze reads. */
if (GET_CODE (x) == SET)
{
can_start_lhs_rhs_p = cslr_p;
sched_analyze_2 (deps, SET_SRC (x), insn);
can_start_lhs_rhs_p = false;
}
}
/* Analyze the uses of memory and registers in rtx X in INSN. */
static void
sched_analyze_2 (class deps_desc *deps, rtx x, rtx_insn *insn)
{
int i;
int j;
enum rtx_code code;
const char *fmt;
bool cslr_p = can_start_lhs_rhs_p;
can_start_lhs_rhs_p = false;
gcc_assert (x);
if (x == 0)
return;
if (cslr_p && sched_deps_info->start_rhs)
sched_deps_info->start_rhs (x);
code = GET_CODE (x);
switch (code)
{
CASE_CONST_ANY:
case SYMBOL_REF:
case CONST:
case LABEL_REF:
/* Ignore constants. */
if (cslr_p && sched_deps_info->finish_rhs)
sched_deps_info->finish_rhs ();
return;
case REG:
{
int regno = REGNO (x);
machine_mode mode = GET_MODE (x);
sched_analyze_reg (deps, regno, mode, USE, insn);
#ifdef STACK_REGS
/* Treat all reads of a stack register as modifying the TOS. */
if (regno >= FIRST_STACK_REG && regno <= LAST_STACK_REG)
{
/* Avoid analyzing the same register twice. */
if (regno != FIRST_STACK_REG)
sched_analyze_reg (deps, FIRST_STACK_REG, mode, USE, insn);
sched_analyze_reg (deps, FIRST_STACK_REG, mode, SET, insn);
}
#endif
if (cslr_p && sched_deps_info->finish_rhs)
sched_deps_info->finish_rhs ();
return;
}
case MEM:
{
/* Reading memory. */
rtx_insn_list *u;
rtx_insn_list *pending;
rtx_expr_list *pending_mem;
rtx t = x;
if (sched_deps_info->use_cselib)
{
machine_mode address_mode = get_address_mode (t);
t = shallow_copy_rtx (t);
cselib_lookup_from_insn (XEXP (t, 0), address_mode, 1,
GET_MODE (t), insn);
XEXP (t, 0)
= cselib_subst_to_values_from_insn (XEXP (t, 0), GET_MODE (t),
insn);
}
if (!DEBUG_INSN_P (insn))
{
t = canon_rtx (t);
pending = deps->pending_read_insns;
pending_mem = deps->pending_read_mems;
while (pending)
{
if (read_dependence (pending_mem->element (), t)
&& ! sched_insns_conditions_mutex_p (insn,
pending->insn ()))
note_mem_dep (t, pending_mem->element (),
pending->insn (),
DEP_ANTI);
pending = pending->next ();
pending_mem = pending_mem->next ();
}
pending = deps->pending_write_insns;
pending_mem = deps->pending_write_mems;
while (pending)
{
if (true_dependence (pending_mem->element (), VOIDmode, t)
&& ! sched_insns_conditions_mutex_p (insn,
pending->insn ()))
note_mem_dep (t, pending_mem->element (),
pending->insn (),
sched_deps_info->generate_spec_deps
? BEGIN_DATA | DEP_TRUE : DEP_TRUE);
pending = pending->next ();
pending_mem = pending_mem->next ();
}
for (u = deps->last_pending_memory_flush; u; u = u->next ())
add_dependence (insn, u->insn (), REG_DEP_ANTI);
for (u = deps->pending_jump_insns; u; u = u->next ())
if (deps_may_trap_p (x))
{
if ((sched_deps_info->generate_spec_deps)
&& sel_sched_p () && (spec_info->mask & BEGIN_CONTROL))
{
ds_t ds = set_dep_weak (DEP_ANTI, BEGIN_CONTROL,
MAX_DEP_WEAK);
note_dep (u->insn (), ds);
}
else
add_dependence (insn, u->insn (), REG_DEP_CONTROL);
}
}
/* Always add these dependencies to pending_reads, since
this insn may be followed by a write. */
if (!deps->readonly)
{
if ((deps->pending_read_list_length
+ deps->pending_write_list_length)
>= param_max_pending_list_length
&& !DEBUG_INSN_P (insn))
flush_pending_lists (deps, insn, true, true);
add_insn_mem_dependence (deps, true, insn, x);
}
sched_analyze_2 (deps, XEXP (x, 0), insn);
if (cslr_p && sched_deps_info->finish_rhs)
sched_deps_info->finish_rhs ();
return;
}
/* Force pending stores to memory in case a trap handler needs them.
Also force pending loads from memory; loads and stores can segfault
and the signal handler won't be triggered if the trap insn was moved
above load or store insn. */
case TRAP_IF:
flush_pending_lists (deps, insn, true, true);
break;
case PREFETCH:
if (PREFETCH_SCHEDULE_BARRIER_P (x))
reg_pending_barrier = TRUE_BARRIER;
/* Prefetch insn contains addresses only. So if the prefetch
address has no registers, there will be no dependencies on
the prefetch insn. This is wrong with result code
correctness point of view as such prefetch can be moved below
a jump insn which usually generates MOVE_BARRIER preventing
to move insns containing registers or memories through the
barrier. It is also wrong with generated code performance
point of view as prefetch withouth dependecies will have a
tendency to be issued later instead of earlier. It is hard
to generate accurate dependencies for prefetch insns as
prefetch has only the start address but it is better to have
something than nothing. */
if (!deps->readonly)
{
rtx x = gen_rtx_MEM (Pmode, XEXP (PATTERN (insn), 0));
if (sched_deps_info->use_cselib)
cselib_lookup_from_insn (x, Pmode, true, VOIDmode, insn);
add_insn_mem_dependence (deps, true, insn, x);
}
break;
case UNSPEC_VOLATILE:
flush_pending_lists (deps, insn, true, true);
/* FALLTHRU */
case ASM_OPERANDS:
case ASM_INPUT:
{
/* Traditional and volatile asm instructions must be considered to use
and clobber all hard registers, all pseudo-registers and all of
memory. So must TRAP_IF and UNSPEC_VOLATILE operations.
Consider for instance a volatile asm that changes the fpu rounding
mode. An insn should not be moved across this even if it only uses
pseudo-regs because it might give an incorrectly rounded result. */
if ((code != ASM_OPERANDS || MEM_VOLATILE_P (x))
&& !DEBUG_INSN_P (insn))
reg_pending_barrier = TRUE_BARRIER;
/* For all ASM_OPERANDS, we must traverse the vector of input operands.
We cannot just fall through here since then we would be confused
by the ASM_INPUT rtx inside ASM_OPERANDS, which do not indicate
traditional asms unlike their normal usage. */
if (code == ASM_OPERANDS)
{
for (j = 0; j < ASM_OPERANDS_INPUT_LENGTH (x); j++)
sched_analyze_2 (deps, ASM_OPERANDS_INPUT (x, j), insn);
if (cslr_p && sched_deps_info->finish_rhs)
sched_deps_info->finish_rhs ();
return;
}
break;
}
case PRE_DEC:
case POST_DEC:
case PRE_INC:
case POST_INC:
/* These both read and modify the result. We must handle them as writes
to get proper dependencies for following instructions. We must handle
them as reads to get proper dependencies from this to previous
instructions. Thus we need to pass them to both sched_analyze_1
and sched_analyze_2. We must call sched_analyze_2 first in order
to get the proper antecedent for the read. */
sched_analyze_2 (deps, XEXP (x, 0), insn);
sched_analyze_1 (deps, x, insn);
if (cslr_p && sched_deps_info->finish_rhs)
sched_deps_info->finish_rhs ();
return;
case POST_MODIFY:
case PRE_MODIFY:
/* op0 = op0 + op1 */
sched_analyze_2 (deps, XEXP (x, 0), insn);
sched_analyze_2 (deps, XEXP (x, 1), insn);
sched_analyze_1 (deps, x, insn);
if (cslr_p && sched_deps_info->finish_rhs)
sched_deps_info->finish_rhs ();
return;
default:
break;
}
/* Other cases: walk the insn. */
fmt = GET_RTX_FORMAT (code);
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
{
if (fmt[i] == 'e')
sched_analyze_2 (deps, XEXP (x, i), insn);
else if (fmt[i] == 'E')
for (j = 0; j < XVECLEN (x, i); j++)
sched_analyze_2 (deps, XVECEXP (x, i, j), insn);
}
if (cslr_p && sched_deps_info->finish_rhs)
sched_deps_info->finish_rhs ();
}
/* Try to group two fusible insns together to prevent scheduler
from scheduling them apart. */
static void
sched_macro_fuse_insns (rtx_insn *insn)
{
rtx_insn *prev;
/* No target hook would return true for debug insn as any of the
hook operand, and with very large sequences of only debug insns
where on each we call sched_macro_fuse_insns it has quadratic
compile time complexity. */
if (DEBUG_INSN_P (insn))
return;
prev = prev_nonnote_nondebug_insn (insn);
if (!prev)
return;
if (any_condjump_p (insn))
{
unsigned int condreg1, condreg2;
rtx cc_reg_1;
if (targetm.fixed_condition_code_regs (&condreg1, &condreg2))
{
cc_reg_1 = gen_rtx_REG (CCmode, condreg1);
if (reg_referenced_p (cc_reg_1, PATTERN (insn))
&& modified_in_p (cc_reg_1, prev))
{
if (targetm.sched.macro_fusion_pair_p (prev, insn))
SCHED_GROUP_P (insn) = 1;
return;
}
}
}
if (single_set (insn) && single_set (prev))
{
if (targetm.sched.macro_fusion_pair_p (prev, insn))
SCHED_GROUP_P (insn) = 1;
}
}
/* Get the implicit reg pending clobbers for INSN and save them in TEMP. */
void
get_implicit_reg_pending_clobbers (HARD_REG_SET *temp, rtx_insn *insn)
{
extract_insn (insn);
preprocess_constraints (insn);
alternative_mask preferred = get_preferred_alternatives (insn);
ira_implicitly_set_insn_hard_regs (temp, preferred);
*temp &= ~ira_no_alloc_regs;
}
/* Analyze an INSN with pattern X to find all dependencies. */
static void
sched_analyze_insn (class deps_desc *deps, rtx x, rtx_insn *insn)
{
RTX_CODE code = GET_CODE (x);
rtx link;
unsigned i;
reg_set_iterator rsi;
if (! reload_completed)
{
HARD_REG_SET temp;
get_implicit_reg_pending_clobbers (&temp, insn);
implicit_reg_pending_clobbers |= temp;
}
can_start_lhs_rhs_p = (NONJUMP_INSN_P (insn)
&& code == SET);
/* Group compare and branch insns for macro-fusion. */
if (!deps->readonly
&& targetm.sched.macro_fusion_p
&& targetm.sched.macro_fusion_p ())
sched_macro_fuse_insns (insn);
if (may_trap_p (x))
/* Avoid moving trapping instructions across function calls that might
not always return. */
add_dependence_list (insn, deps->last_function_call_may_noreturn,
1, REG_DEP_ANTI, true);
/* We must avoid creating a situation in which two successors of the
current block have different unwind info after scheduling. If at any
point the two paths re-join this leads to incorrect unwind info. */
/* ??? There are certain situations involving a forced frame pointer in
which, with extra effort, we could fix up the unwind info at a later
CFG join. However, it seems better to notice these cases earlier
during prologue generation and avoid marking the frame pointer setup
as frame-related at all. */
if (RTX_FRAME_RELATED_P (insn))
{
/* Make sure prologue insn is scheduled before next jump. */
deps->sched_before_next_jump
= alloc_INSN_LIST (insn, deps->sched_before_next_jump);
/* Make sure epilogue insn is scheduled after preceding jumps. */
add_dependence_list (insn, deps->last_pending_memory_flush, 1,
REG_DEP_ANTI, true);
add_dependence_list (insn, deps->pending_jump_insns, 1, REG_DEP_ANTI,
true);