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sched-deps.c
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sched-deps.c
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/* Instruction scheduling pass. This file computes dependencies between
instructions.
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)
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 "tm.h"
#include "toplev.h"
#include "rtl.h"
#include "tm_p.h"
#include "hard-reg-set.h"
#include "regs.h"
#include "function.h"
#include "flags.h"
#include "insn-config.h"
#include "insn-attr.h"
#include "except.h"
#include "toplev.h"
#include "recog.h"
#include "sched-int.h"
#include "params.h"
#include "cselib.h"
#ifdef INSN_SCHEDULING
#ifdef ENABLE_CHECKING
#define CHECK (true)
#else
#define CHECK (false)
#endif
/* 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, heap) *h_d_i_d = NULL;
/* 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;
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;
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 pro, rtx con, enum reg_note type, ds_t ds)
{
DEP_PRO (dep) = pro;
DEP_CON (dep) = con;
DEP_TYPE (dep) = type;
DEP_STATUS (dep) = ds;
}
/* 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 pro, rtx con, enum reg_note kind)
{
ds_t ds;
if ((current_sched_info->flags & USE_DEPS_LIST))
ds = dk_to_ds (kind);
else
ds = -1;
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_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");
}
/* 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));
++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);
--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 alloc_pool 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 = (dep_node_t) pool_alloc (dn_pool);
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)));
--dn_pool_diff;
pool_free (dn_pool, n);
}
/* Pool to hold dependencies lists (deps_list_t). */
static alloc_pool 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 = (deps_list_t) pool_alloc (dl_pool);
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;
pool_free (dl_pool, 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);
}
static regset reg_pending_sets;
static regset reg_pending_clobbers;
static regset reg_pending_uses;
static enum reg_pending_barrier_mode reg_pending_barrier;
/* 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_head *true_dependency_cache = NULL;
static bitmap_head *output_dependency_cache = NULL;
static bitmap_head *anti_dependency_cache = NULL;
static bitmap_head *spec_dependency_cache = NULL;
static int cache_size;
static int deps_may_trap_p (const_rtx);
static void add_dependence_list (rtx, rtx, int, enum reg_note);
static void add_dependence_list_and_free (struct deps *, rtx,
rtx *, int, enum reg_note);
static void delete_all_dependences (rtx);
static void fixup_sched_groups (rtx);
static void flush_pending_lists (struct deps *, rtx, int, int);
static void sched_analyze_1 (struct deps *, rtx, rtx);
static void sched_analyze_2 (struct deps *, rtx, rtx);
static void sched_analyze_insn (struct deps *, rtx, rtx);
static bool sched_has_condition_p (const_rtx);
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);
#ifdef ENABLE_CHECKING
static void check_dep (dep_t, bool);
#endif
/* 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 (const_rtx insn, bool *rev)
{
rtx pat = PATTERN (insn);
rtx src;
if (pat == 0)
return 0;
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;
}
/* True when we can find a condition under which INSN is executed. */
static bool
sched_has_condition_p (const_rtx 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))
&& 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 insn1, const_rtx 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, 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)))
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_p (PATTERN (insn)))
/* If instruction might trap, 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);
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)
{
return sd_lists_size (insn, list_types) == 0;
}
/* Initialize data for INSN. */
void
sd_init_insn (rtx 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)
{
/* ??? 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);
gcc_assert (output_dependency_cache != NULL
&& anti_dependency_cache != NULL);
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))
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 elem = DEP_PRO (dep);
rtx 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);
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
/* 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 (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;
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 & 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;
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 elem = DEP_PRO (dep);
rtx 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);