/* Instruction scheduling pass. This file computes dependencies between
instructions.
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
+ 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 GNU CC.
+This file is part of GCC.
-GNU CC is free software; you can redistribute it and/or modify it
-under the terms of the GNU General Public License as published by the
-Free Software Foundation; either version 2, or (at your option) any
-later version.
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
-GNU CC is distributed in the hope that it will be useful, but WITHOUT
-ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+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 GNU CC; see the file COPYING. If not, write to the Free
-the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING. If not, write to the Free
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
\f
#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 "basic-block.h"
#include "regs.h"
#include "function.h"
#include "flags.h"
#include "toplev.h"
#include "recog.h"
#include "sched-int.h"
+#include "params.h"
+#include "cselib.h"
+#include "df.h"
-extern char *reg_known_equiv_p;
-extern rtx *reg_known_value;
+#ifdef ENABLE_CHECKING
+#define CHECK (true)
+#else
+#define CHECK (false)
+#endif
+
+/* 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. */
+static void
+init_dep_1 (dep_t dep, rtx pro, rtx con, enum reg_note kind, ds_t ds)
+{
+ DEP_PRO (dep) = pro;
+ DEP_CON (dep) = con;
+ DEP_KIND (dep) = kind;
+ 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) != 0)
+ 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));
+}
+
+/* Functions to operate with a single link from the dependencies lists -
+ dep_link_t. */
+
+/* Return true if dep_link L is consistent. */
+static bool
+dep_link_consistent_p (dep_link_t l)
+{
+ dep_link_t next = DEP_LINK_NEXT (l);
+
+ return (next == NULL
+ || &DEP_LINK_NEXT (l) == DEP_LINK_PREV_NEXTP (next));
+}
+
+/* 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));
+}
+
+/* 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;
+
+ /* Though this is property is not used anywhere but in the assert in
+ attach_dep_link (), this can prevent latent errors. */
+ DEP_LINK_PREV_NEXTP (l) = NULL;
+ DEP_LINK_NEXT (l) = NULL;
+}
+
+/* Move LINK from whatever list it is now to L. */
+void
+move_dep_link (dep_link_t link, deps_list_t l)
+{
+ detach_dep_link (link);
+ add_to_deps_list (link, l);
+}
+
+/* Check L's and its successors' consistency.
+ This is, potentially, an expensive check, hence it should be guarded by
+ ENABLE_CHECKING at all times. */
+static bool
+dep_links_consistent_p (dep_link_t l)
+{
+ while (l != NULL)
+ {
+ if (dep_link_consistent_p (l))
+ l = DEP_LINK_NEXT (l);
+ else
+ return false;
+ }
+
+ return true;
+}
+
+/* Dump dep_nodes starting from l. */
+static void
+dump_dep_links (FILE *dump, dep_link_t l)
+{
+ while (l != NULL)
+ {
+ dep_t d = DEP_LINK_DEP (l);
+
+ fprintf (dump, "%d%c>%d ", INSN_UID (DEP_PRO (d)),
+ dep_link_consistent_p (l) ? '-' : '!', INSN_UID (DEP_CON (d)));
+
+ l = DEP_LINK_NEXT (l);
+ }
+
+ fprintf (dump, "\n");
+}
+
+/* Dump dep_nodes starting from L to stderr. */
+void
+debug_dep_links (dep_link_t l)
+{
+ dump_dep_links (stderr, l);
+}
+
+/* Obstack to allocate dep_nodes and deps_lists on. */
+static struct obstack deps_obstack;
+
+/* Obstack to hold forward dependencies lists (deps_list_t). */
+static struct obstack *dl_obstack = &deps_obstack;
+
+/* Obstack to hold all dependency nodes (dep_node_t). */
+static struct obstack *dn_obstack = &deps_obstack;
+
+/* Functions to operate with dependences lists - deps_list_t. */
+
+/* Allocate deps_list.
+
+ If ON_OBSTACK_P is true, allocate the list on the obstack. This is done for
+ INSN_FORW_DEPS lists because they should live till the end of scheduling.
+
+ INSN_BACK_DEPS and INSN_RESOLVED_BACK_DEPS lists are allocated on the free
+ store and are being freed in haifa-sched.c: schedule_insn (). */
+static deps_list_t
+alloc_deps_list (bool on_obstack_p)
+{
+ if (on_obstack_p)
+ return obstack_alloc (dl_obstack, sizeof (struct _deps_list));
+ else
+ return xmalloc (sizeof (struct _deps_list));
+}
+
+/* Initialize deps_list L. */
+static void
+init_deps_list (deps_list_t l)
+{
+ DEPS_LIST_FIRST (l) = NULL;
+}
+
+/* Create (allocate and init) deps_list.
+ The meaning of ON_OBSTACK_P is the same as in alloc_deps_list (). */
+deps_list_t
+create_deps_list (bool on_obstack_p)
+{
+ deps_list_t l = alloc_deps_list (on_obstack_p);
+
+ init_deps_list (l);
+ return l;
+}
+
+/* Free dep_data_nodes that present in L. */
+static void
+clear_deps_list (deps_list_t l)
+{
+ /* All dep_nodes are allocated on the dn_obstack. They'll be freed with
+ the obstack. */
-static regset_head reg_pending_sets_head;
-static regset_head reg_pending_clobbers_head;
+ DEPS_LIST_FIRST (l) = NULL;
+}
+
+/* Free deps_list L. */
+void
+free_deps_list (deps_list_t l)
+{
+ gcc_assert (deps_list_empty_p (l));
+ free (l);
+}
+
+/* Delete (clear and free) deps_list L. */
+void
+delete_deps_list (deps_list_t l)
+{
+ clear_deps_list (l);
+ free_deps_list (l);
+}
+
+/* Return true if L is empty. */
+bool
+deps_list_empty_p (deps_list_t l)
+{
+ return DEPS_LIST_FIRST (l) == NULL;
+}
+
+/* Check L's consistency.
+ This is, potentially, an expensive check, hence it should be guarded by
+ ENABLE_CHECKING at all times. */
+static bool
+deps_list_consistent_p (deps_list_t l)
+{
+ dep_link_t first = DEPS_LIST_FIRST (l);
+
+ return (first == NULL
+ || (&DEPS_LIST_FIRST (l) == DEP_LINK_PREV_NEXTP (first)
+ && dep_links_consistent_p (first)));
+}
+
+/* Dump L to F. */
+static void
+dump_deps_list (FILE *f, deps_list_t l)
+{
+ dump_dep_links (f, DEPS_LIST_FIRST (l));
+}
+
+/* Dump L to STDERR. */
+void
+debug_deps_list (deps_list_t l)
+{
+ dump_deps_list (stderr, l);
+}
+
+/* Add a dependency described by DEP to the list L.
+ L should be either INSN_BACK_DEPS or INSN_RESOLVED_BACK_DEPS. */
+void
+add_back_dep_to_deps_list (deps_list_t l, dep_t dep_from)
+{
+ dep_node_t n = (dep_node_t) obstack_alloc (dn_obstack,
+ sizeof (*n));
+ dep_t dep_to = DEP_NODE_DEP (n);
+ dep_link_t back = DEP_NODE_BACK (n);
+ dep_link_t forw = DEP_NODE_FORW (n);
+
+ copy_dep (dep_to, dep_from);
+
+ DEP_LINK_NODE (back) = n;
+ DEP_LINK_NODE (forw) = n;
+
+ /* There is no particular need to initialize these four fields except to make
+ assert in attach_dep_link () happy. */
+ DEP_LINK_NEXT (back) = NULL;
+ DEP_LINK_PREV_NEXTP (back) = NULL;
+ DEP_LINK_NEXT (forw) = NULL;
+ DEP_LINK_PREV_NEXTP (forw) = NULL;
+
+ add_to_deps_list (back, l);
+}
+
+/* Find the dep_link with producer PRO in deps_list L. */
+dep_link_t
+find_link_by_pro_in_deps_list (deps_list_t l, rtx pro)
+{
+ dep_link_t link;
+
+ FOR_EACH_DEP_LINK (link, l)
+ if (DEP_LINK_PRO (link) == pro)
+ return link;
+
+ return NULL;
+}
+
+/* Find the dep_link with consumer CON in deps_list L. */
+dep_link_t
+find_link_by_con_in_deps_list (deps_list_t l, rtx con)
+{
+ dep_link_t link;
+
+ FOR_EACH_DEP_LINK (link, l)
+ if (DEP_LINK_CON (link) == con)
+ return link;
+
+ return NULL;
+}
+
+/* Make a copy of FROM in TO with substituting consumer with CON.
+ TO and FROM should be RESOLVED_BACK_DEPS lists. */
+void
+copy_deps_list_change_con (deps_list_t to, deps_list_t from, rtx con)
+{
+ dep_link_t l;
+
+ gcc_assert (deps_list_empty_p (to));
+
+ FOR_EACH_DEP_LINK (l, from)
+ {
+ add_back_dep_to_deps_list (to, DEP_LINK_DEP (l));
+ DEP_LINK_CON (DEPS_LIST_FIRST (to)) = con;
+ }
+}
static regset reg_pending_sets;
static regset reg_pending_clobbers;
-static int reg_pending_sets_all;
+static regset reg_pending_uses;
+
+/* The following enumeration values tell us what dependencies we
+ should use to implement the barrier. We use true-dependencies for
+ TRUE_BARRIER and anti-dependencies for MOVE_BARRIER. */
+enum reg_pending_barrier_mode
+{
+ NOT_A_BARRIER = 0,
+ MOVE_BARRIER,
+ TRUE_BARRIER
+};
+
+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
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 sbitmap *true_dependency_cache;
-static sbitmap *anti_dependency_cache;
-static sbitmap *output_dependency_cache;
+ allocated then the rest two ones are also allocated. */
+static bitmap_head *true_dependency_cache;
+static bitmap_head *output_dependency_cache;
+static bitmap_head *anti_dependency_cache;
+static bitmap_head *spec_dependency_cache;
+static int cache_size;
/* To speed up checking consistency of formed forward insn
dependencies we use the following cache. Another possible solution
could be switching off checking duplication of insns in forward
- dependencies. */
+ dependencies. */
#ifdef ENABLE_CHECKING
-static sbitmap *forward_dependency_cache;
+static bitmap_head *forward_dependency_cache;
#endif
-static int deps_may_trap_p PARAMS ((rtx));
-static void remove_dependence PARAMS ((rtx, rtx));
-static void set_sched_group_p PARAMS ((rtx));
-
-static void flush_pending_lists PARAMS ((struct deps *, rtx, int));
-static void sched_analyze_1 PARAMS ((struct deps *, rtx, rtx));
-static void sched_analyze_2 PARAMS ((struct deps *, rtx, rtx));
-static void sched_analyze_insn PARAMS ((struct deps *, rtx, rtx, rtx));
-static rtx group_leader PARAMS ((rtx));
-
-static rtx get_condition PARAMS ((rtx));
-static int conditions_mutex_p PARAMS ((rtx, rtx));
+static int deps_may_trap_p (rtx);
+static void add_dependence_list (rtx, rtx, int, enum reg_note);
+static void add_dependence_list_and_free (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 rtx sched_get_condition (rtx);
+static int conditions_mutex_p (rtx, rtx);
+
+static enum DEPS_ADJUST_RESULT maybe_add_or_update_back_dep_1 (rtx, rtx,
+ enum reg_note, ds_t, rtx, rtx, dep_link_t **);
+static enum DEPS_ADJUST_RESULT add_or_update_back_dep_1 (rtx, rtx,
+ enum reg_note, ds_t, rtx, rtx, dep_link_t **);
+static void add_back_dep (rtx, rtx, enum reg_note, ds_t);
+
+static void adjust_add_sorted_back_dep (rtx, dep_link_t, dep_link_t *);
+static void adjust_back_add_forw_dep (rtx, dep_link_t *);
+static void delete_forw_dep (dep_link_t);
+static dw_t estimate_dep_weak (rtx, rtx);
+#ifdef INSN_SCHEDULING
+#ifdef ENABLE_CHECKING
+static void check_dep_status (enum reg_note, ds_t, bool);
+#endif
+#endif
\f
/* Return nonzero if a load of the memory reference MEM can cause a trap. */
static int
-deps_may_trap_p (mem)
- rtx mem;
+deps_may_trap_p (rtx mem)
{
rtx addr = XEXP (mem, 0);
- if (REG_P (addr)
- && REGNO (addr) >= FIRST_PSEUDO_REGISTER
- && reg_known_value[REGNO (addr)])
- addr = reg_known_value[REGNO (addr)];
- return rtx_addr_can_trap_p (addr);
-}
-\f
-/* Return the INSN_LIST containing INSN in LIST, or NULL
- if LIST does not contain INSN. */
-
-HAIFA_INLINE rtx
-find_insn_list (insn, list)
- rtx insn;
- rtx list;
-{
- while (list)
- {
- if (XEXP (list, 0) == insn)
- return list;
- list = XEXP (list, 1);
- }
- return 0;
-}
-
-/* Return 1 if the pair (insn, x) is found in (LIST, LIST1), or 0
- otherwise. */
-
-HAIFA_INLINE int
-find_insn_mem_list (insn, x, list, list1)
- rtx insn, x;
- rtx list, list1;
-{
- while (list)
+ if (REG_P (addr) && REGNO (addr) >= FIRST_PSEUDO_REGISTER)
{
- if (XEXP (list, 0) == insn
- && XEXP (list1, 0) == x)
- return 1;
- list = XEXP (list, 1);
- list1 = XEXP (list1, 1);
+ rtx t = get_reg_known_value (REGNO (addr));
+ if (t)
+ addr = t;
}
- return 0;
+ return rtx_addr_can_trap_p (addr);
}
\f
/* Find the condition under which INSN is executed. */
static rtx
-get_condition (insn)
- rtx insn;
+sched_get_condition (rtx insn)
{
rtx pat = PATTERN (insn);
- rtx cond;
+ rtx src;
if (pat == 0)
return 0;
+
if (GET_CODE (pat) == COND_EXEC)
return COND_EXEC_TEST (pat);
- if (GET_CODE (insn) != JUMP_INSN)
- return 0;
- if (GET_CODE (pat) != SET || SET_SRC (pat) != pc_rtx)
- return 0;
- if (GET_CODE (SET_DEST (pat)) != IF_THEN_ELSE)
- return 0;
- pat = SET_DEST (pat);
- cond = XEXP (pat, 0);
- if (GET_CODE (XEXP (cond, 1)) == LABEL_REF
- && XEXP (cond, 2) == pc_rtx)
- return cond;
- else if (GET_CODE (XEXP (cond, 2)) == LABEL_REF
- && XEXP (cond, 1) == pc_rtx)
- return gen_rtx_fmt_ee (reverse_condition (GET_CODE (cond)), GET_MODE (cond),
- XEXP (cond, 0), XEXP (cond, 1));
- else
+
+ 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;
+ return gen_rtx_fmt_ee (revcode, GET_MODE (cond), XEXP (cond, 0),
+ XEXP (cond, 1));
+ }
+
+ return 0;
}
+\f
/* Return nonzero if conditions COND1 and COND2 can never be both true. */
static int
-conditions_mutex_p (cond1, cond2)
- rtx cond1, cond2;
+conditions_mutex_p (rtx cond1, rtx cond2)
{
- if (GET_RTX_CLASS (GET_CODE (cond1)) == '<'
- && GET_RTX_CLASS (GET_CODE (cond2)) == '<'
- && GET_CODE (cond1) == reverse_condition (GET_CODE (cond2))
+ if (COMPARISON_P (cond1)
+ && COMPARISON_P (cond2)
+ && GET_CODE (cond1) == reversed_comparison_code (cond2, NULL)
&& XEXP (cond1, 0) == XEXP (cond2, 0)
&& XEXP (cond1, 1) == XEXP (cond2, 1))
return 1;
return 0;
}
-\f
-/* Add ELEM wrapped in an INSN_LIST with reg note kind DEP_TYPE to the
- LOG_LINKS of INSN, if not already there. DEP_TYPE indicates the type
- of dependence that this link represents. */
-void
-add_dependence (insn, elem, dep_type)
- rtx insn;
- rtx elem;
- enum reg_note dep_type;
-{
- rtx link, next;
- int present_p;
- enum reg_note present_dep_type;
+/* 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 (rtx insn1, rtx insn2)
+{
rtx cond1, cond2;
- /* Don't depend an insn on itself. */
- if (insn == elem)
- return;
-
- /* We can get a dependency on deleted insns due to optimizations in
- the register allocation and reloading or due to splitting. Any
- such dependency is useless and can be ignored. */
- if (GET_CODE (elem) == NOTE)
- return;
-
/* flow.c doesn't handle conditional lifetimes entirely correctly;
calls mess up the conditional lifetimes. */
- if (GET_CODE (insn) != CALL_INSN && GET_CODE (elem) != CALL_INSN)
+ if (!CALL_P (insn1) && !CALL_P (insn2))
{
- cond1 = get_condition (insn);
- cond2 = get_condition (elem);
- if (cond1 && cond2 && conditions_mutex_p (cond1, cond2))
- return;
+ cond1 = sched_get_condition (insn1);
+ cond2 = sched_get_condition (insn2);
+ if (cond1 && cond2
+ && conditions_mutex_p (cond1, cond2)
+ /* 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;
+}
+\f
+/* Add ELEM wrapped in an dep_link with reg note kind DEP_TYPE to the
+ INSN_BACK_DEPS (INSN), if it is not already there. DEP_TYPE indicates the
+ type of dependence that this link represents. DS, if nonzero,
+ indicates speculations, through which this dependence can be overcome.
+ MEM1 and MEM2, if non-null, corresponds 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.
+ In case of changed entry CHANGED_LINKPP sets to its address.
+ See also the definition of enum DEPS_ADJUST_RESULT in sched-int.h.
+ Actual manipulation of dependence data structures is performed in
+ add_or_update_back_dep_1. */
+
+static enum DEPS_ADJUST_RESULT
+maybe_add_or_update_back_dep_1 (rtx insn, rtx elem, enum reg_note dep_type,
+ ds_t ds, rtx mem1, rtx mem2,
+ dep_link_t **changed_linkpp)
+{
+ gcc_assert (INSN_P (insn) && INSN_P (elem));
- /* If elem is part of a sequence that must be scheduled together, then
- make the dependence point to the last insn of the sequence.
- When HAVE_cc0, it is possible for NOTEs to exist between users and
- setters of the condition codes, so we must skip past notes here.
- Otherwise, NOTEs are impossible here. */
- next = next_nonnote_insn (elem);
- if (next && SCHED_GROUP_P (next)
- && GET_CODE (next) != CODE_LABEL)
+ /* Don't depend an insn on itself. */
+ if (insn == elem)
{
- /* Notes will never intervene here though, so don't bother checking
- for them. */
- /* Hah! Wrong. */
- /* We must reject CODE_LABELs, so that we don't get confused by one
- that has LABEL_PRESERVE_P set, which is represented by the same
- bit in the rtl as SCHED_GROUP_P. A CODE_LABEL can never be
- SCHED_GROUP_P. */
-
- rtx nnext;
- while ((nnext = next_nonnote_insn (next)) != NULL
- && SCHED_GROUP_P (nnext)
- && GET_CODE (nnext) != CODE_LABEL)
- next = nnext;
-
- /* Again, don't depend an insn on itself. */
- if (insn == next)
- return;
-
- /* Make the dependence to NEXT, the last insn of the group, instead
- of the original ELEM. */
- elem = next;
+#ifdef INSN_SCHEDULING
+ if (current_sched_info->flags & DO_SPECULATION)
+ /* INSN has an internal dependence, which we can't overcome. */
+ HAS_INTERNAL_DEP (insn) = 1;
+#endif
+ return 0;
}
- present_p = 1;
+ return add_or_update_back_dep_1 (insn, elem, dep_type,
+ ds, mem1, mem2, changed_linkpp);
+}
+
+/* This function has the same meaning of parameters and return values
+ as maybe_add_or_update_back_dep_1. The only difference between these
+ two functions is that INSN and ELEM are guaranteed not to be the same
+ in this one. */
+static enum DEPS_ADJUST_RESULT
+add_or_update_back_dep_1 (rtx insn, rtx elem, enum reg_note dep_type,
+ ds_t ds ATTRIBUTE_UNUSED,
+ rtx mem1 ATTRIBUTE_UNUSED, rtx mem2 ATTRIBUTE_UNUSED,
+ dep_link_t **changed_linkpp ATTRIBUTE_UNUSED)
+{
+ bool maybe_present_p = true, present_p = false;
+
+ gcc_assert (INSN_P (insn) && INSN_P (elem) && insn != elem);
+
#ifdef INSN_SCHEDULING
- /* ??? No good way to tell from here whether we're doing interblock
- scheduling. Possibly add another callback. */
-#if 0
- /* (This code is guarded by INSN_SCHEDULING, otherwise INSN_BB is undefined.)
- No need for interblock dependences with calls, since
- calls are not moved between blocks. Note: the edge where
- elem is a CALL is still required. */
- if (GET_CODE (insn) == CALL_INSN
- && (INSN_BB (elem) != INSN_BB (insn)))
- return;
+
+#ifdef ENABLE_CHECKING
+ check_dep_status (dep_type, ds, mem1 != NULL);
#endif
/* If we already have a dependency for ELEM, then we do not need to
dramatically for some code. */
if (true_dependency_cache != NULL)
{
- if (anti_dependency_cache == NULL || output_dependency_cache == NULL)
- abort ();
- if (TEST_BIT (true_dependency_cache[INSN_LUID (insn)], INSN_LUID (elem)))
- present_dep_type = 0;
- else if (TEST_BIT (anti_dependency_cache[INSN_LUID (insn)],
- INSN_LUID (elem)))
- present_dep_type = REG_DEP_ANTI;
- else if (TEST_BIT (output_dependency_cache[INSN_LUID (insn)],
- INSN_LUID (elem)))
- present_dep_type = REG_DEP_OUTPUT;
- else
- present_p = 0;
- if (present_p && (int) dep_type >= (int) present_dep_type)
- return;
- }
-#endif
-
- /* Check that we don't already have this dependence. */
- if (present_p)
- for (link = LOG_LINKS (insn); link; link = XEXP (link, 1))
- if (XEXP (link, 0) == elem)
- {
-#ifdef INSN_SCHEDULING
- /* Clear corresponding cache entry because type of the link
- may be changed. */
- if (true_dependency_cache != NULL)
+ enum reg_note present_dep_type;
+
+ gcc_assert (output_dependency_cache);
+ gcc_assert (anti_dependency_cache);
+ if (!(current_sched_info->flags & USE_DEPS_LIST))
+ {
+ if (bitmap_bit_p (&true_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem)))
+ present_dep_type = REG_DEP_TRUE;
+ else if (bitmap_bit_p (&output_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem)))
+ present_dep_type = REG_DEP_OUTPUT;
+ else if (bitmap_bit_p (&anti_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem)))
+ present_dep_type = REG_DEP_ANTI;
+ else
+ maybe_present_p = false;
+
+ if (maybe_present_p)
{
- if (REG_NOTE_KIND (link) == REG_DEP_ANTI)
- RESET_BIT (anti_dependency_cache[INSN_LUID (insn)],
- INSN_LUID (elem));
- else if (REG_NOTE_KIND (link) == REG_DEP_OUTPUT
- && output_dependency_cache)
- RESET_BIT (output_dependency_cache[INSN_LUID (insn)],
- INSN_LUID (elem));
+ if ((int) dep_type >= (int) present_dep_type)
+ return DEP_PRESENT;
+
+ present_p = true;
+ }
+ }
+ else
+ {
+ ds_t present_dep_types = 0;
+
+ if (bitmap_bit_p (&true_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem)))
+ present_dep_types |= DEP_TRUE;
+ if (bitmap_bit_p (&output_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem)))
+ present_dep_types |= DEP_OUTPUT;
+ if (bitmap_bit_p (&anti_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem)))
+ present_dep_types |= DEP_ANTI;
+
+ if (present_dep_types)
+ {
+ if (!(current_sched_info->flags & DO_SPECULATION)
+ || !bitmap_bit_p (&spec_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem)))
+ {
+ if ((present_dep_types | (ds & DEP_TYPES))
+ == present_dep_types)
+ /* We already have all these bits. */
+ return DEP_PRESENT;
+ }
else
- abort ();
+ {
+ /* 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 (additional dep is SPECULATIVE) then
+ we should update DEP_STATUS
+ else
+ we should reset existing dep to non-speculative. */
+ }
+
+ present_p = true;
}
+ else
+ maybe_present_p = false;
+ }
+ }
#endif
- /* 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 < (int) REG_NOTE_KIND (link))
- PUT_REG_NOTE_KIND (link, dep_type);
+ /* Check that we don't already have this dependence. */
+ if (maybe_present_p)
+ {
+ dep_link_t *linkp;
+
+ for (linkp = &DEPS_LIST_FIRST (INSN_BACK_DEPS (insn));
+ *linkp != NULL;
+ linkp = &DEP_LINK_NEXT (*linkp))
+ {
+ dep_t link = DEP_LINK_DEP (*linkp);
+
+ gcc_assert (true_dependency_cache == 0 || present_p);
+ if (DEP_PRO (link) == elem)
+ {
+ enum DEPS_ADJUST_RESULT changed_p = DEP_PRESENT;
+
#ifdef INSN_SCHEDULING
- /* 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)
- {
- if ((int)REG_NOTE_KIND (link) == 0)
- SET_BIT (true_dependency_cache[INSN_LUID (insn)],
- INSN_LUID (elem));
- else if (REG_NOTE_KIND (link) == REG_DEP_ANTI)
- SET_BIT (anti_dependency_cache[INSN_LUID (insn)],
- INSN_LUID (elem));
- else if (REG_NOTE_KIND (link) == REG_DEP_OUTPUT)
- SET_BIT (output_dependency_cache[INSN_LUID (insn)],
- INSN_LUID (elem));
- }
+ if (current_sched_info->flags & USE_DEPS_LIST)
+ {
+ ds_t new_status = ds | DEP_STATUS (link);
+
+ if (new_status & SPECULATIVE)
+ {
+ if (!(ds & SPECULATIVE)
+ || !(DEP_STATUS (link) & SPECULATIVE))
+ /* Then this dep can't be speculative. */
+ {
+ new_status &= ~SPECULATIVE;
+ if (true_dependency_cache
+ && (DEP_STATUS (link) & SPECULATIVE))
+ bitmap_clear_bit (&spec_dependency_cache
+ [INSN_LUID (insn)],
+ INSN_LUID (elem));
+ }
+ else
+ {
+ /* Both are speculative. Merging probabilities. */
+ if (mem1)
+ {
+ dw_t dw;
+
+ dw = estimate_dep_weak (mem1, mem2);
+ ds = set_dep_weak (ds, BEGIN_DATA, dw);
+ }
+
+ new_status = ds_merge (DEP_STATUS (link), ds);
+ }
+ }
+
+ ds = new_status;
+ }
+
+ /* Clear corresponding cache entry because type of the link
+ may have changed. Keep them if we use_deps_list. */
+ if (true_dependency_cache != NULL
+ && !(current_sched_info->flags & USE_DEPS_LIST))
+ {
+ enum reg_note kind = DEP_KIND (link);
+
+ switch (kind)
+ {
+ case REG_DEP_OUTPUT:
+ bitmap_clear_bit (&output_dependency_cache
+ [INSN_LUID (insn)], INSN_LUID (elem));
+ break;
+ case REG_DEP_ANTI:
+ bitmap_clear_bit (&anti_dependency_cache
+ [INSN_LUID (insn)], INSN_LUID (elem));
+ break;
+ default:
+ gcc_unreachable ();
+ }
+ }
+
+ if ((current_sched_info->flags & USE_DEPS_LIST)
+ && DEP_STATUS (link) != ds)
+ {
+ DEP_STATUS (link) = ds;
+ changed_p = DEP_CHANGED;
+ }
#endif
- return;
- }
- /* Might want to check one level of transitivity to save conses. */
-
- link = alloc_INSN_LIST (elem, LOG_LINKS (insn));
- LOG_LINKS (insn) = link;
- /* Insn dependency, not data dependency. */
- PUT_REG_NOTE_KIND (link, dep_type);
+ /* 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 < (int) DEP_KIND (link))
+ {
+ DEP_KIND (link) = dep_type;
+ changed_p = DEP_CHANGED;
+ }
#ifdef INSN_SCHEDULING
- /* 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)
+ /* 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)
+ {
+ if (!(current_sched_info->flags & USE_DEPS_LIST))
+ {
+ if (DEP_KIND (link) == REG_DEP_TRUE)
+ bitmap_set_bit (&true_dependency_cache
+ [INSN_LUID (insn)], INSN_LUID (elem));
+ else if (DEP_KIND (link) == REG_DEP_OUTPUT)
+ bitmap_set_bit (&output_dependency_cache
+ [INSN_LUID (insn)], INSN_LUID (elem));
+ else if (DEP_KIND (link) == REG_DEP_ANTI)
+ bitmap_set_bit (&anti_dependency_cache
+ [INSN_LUID (insn)], INSN_LUID (elem));
+ }
+ else
+ {
+ if (ds & DEP_TRUE)
+ bitmap_set_bit (&true_dependency_cache
+ [INSN_LUID (insn)], INSN_LUID (elem));
+ if (ds & DEP_OUTPUT)
+ bitmap_set_bit (&output_dependency_cache
+ [INSN_LUID (insn)], INSN_LUID (elem));
+ if (ds & DEP_ANTI)
+ bitmap_set_bit (&anti_dependency_cache
+ [INSN_LUID (insn)], INSN_LUID (elem));
+ /* Note, that dep can become speculative only
+ at the moment of creation. Thus, we don't need to
+ check for it here. */
+ }
+ }
+
+ if (changed_linkpp && changed_p == DEP_CHANGED)
+ *changed_linkpp = linkp;
+#endif
+ return changed_p;
+ }
+ }
+ /* We didn't find a dep. It shouldn't be 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_back_dep_1.
+ Since we made it to add_or_update_back_dep_1, we must create
+ (or update) a link. */
+
+ if (mem1)
{
- if ((int)dep_type == 0)
- SET_BIT (true_dependency_cache[INSN_LUID (insn)], INSN_LUID (elem));
- else if (dep_type == REG_DEP_ANTI)
- SET_BIT (anti_dependency_cache[INSN_LUID (insn)], INSN_LUID (elem));
- else if (dep_type == REG_DEP_OUTPUT)
- SET_BIT (output_dependency_cache[INSN_LUID (insn)], INSN_LUID (elem));
+ gcc_assert (current_sched_info->flags & DO_SPECULATION);
+ ds = set_dep_weak (ds, BEGIN_DATA, estimate_dep_weak (mem1, mem2));
}
-#endif
+
+ add_back_dep (insn, elem, dep_type, ds);
+
+ return DEP_CREATED;
}
-/* Remove ELEM wrapped in an INSN_LIST from the LOG_LINKS
- of INSN. Abort if not found. */
-
+/* This function creates a link between INSN and ELEM under any
+ conditions. DS describes speculative status of the link. */
static void
-remove_dependence (insn, elem)
- rtx insn;
- rtx elem;
+add_back_dep (rtx insn, rtx elem, enum reg_note dep_type, ds_t ds)
{
- rtx prev, link, next;
- int found = 0;
+ struct _dep _dep, *dep = &_dep;
- for (prev = 0, link = LOG_LINKS (insn); link; link = next)
- {
- next = XEXP (link, 1);
- if (XEXP (link, 0) == elem)
- {
- if (prev)
- XEXP (prev, 1) = next;
- else
- LOG_LINKS (insn) = next;
+ gcc_assert (INSN_P (insn) && INSN_P (elem) && insn != elem);
+
+ if (current_sched_info->flags & USE_DEPS_LIST)
+ init_dep_1 (dep, elem, insn, dep_type, ds);
+ else
+ init_dep_1 (dep, elem, insn, dep_type, -1);
+
+ add_back_dep_to_deps_list (INSN_BACK_DEPS (insn), dep);
#ifdef INSN_SCHEDULING
- /* If we are removing a dependency from the LOG_LINKS list,
- make sure to remove it from the cache too. */
- if (true_dependency_cache != NULL)
+#ifdef ENABLE_CHECKING
+ check_dep_status (dep_type, ds, false);
+#endif
+
+ /* 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)
+ {
+ if (!(current_sched_info->flags & USE_DEPS_LIST))
+ {
+ if (dep_type == REG_DEP_TRUE)
+ bitmap_set_bit (&true_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem));
+ else if (dep_type == REG_DEP_OUTPUT)
+ bitmap_set_bit (&output_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem));
+ else if (dep_type == REG_DEP_ANTI)
+ bitmap_set_bit (&anti_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem));
+ }
+ else
+ {
+ if (ds & DEP_TRUE)
+ bitmap_set_bit (&true_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem));
+ if (ds & DEP_OUTPUT)
+ bitmap_set_bit (&output_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem));
+ if (ds & DEP_ANTI)
+ bitmap_set_bit (&anti_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem));
+ if (ds & SPECULATIVE)
{
- if (REG_NOTE_KIND (link) == 0)
- RESET_BIT (true_dependency_cache[INSN_LUID (insn)],
- INSN_LUID (elem));
- else if (REG_NOTE_KIND (link) == REG_DEP_ANTI)
- RESET_BIT (anti_dependency_cache[INSN_LUID (insn)],
- INSN_LUID (elem));
- else if (REG_NOTE_KIND (link) == REG_DEP_OUTPUT)
- RESET_BIT (output_dependency_cache[INSN_LUID (insn)],
- INSN_LUID (elem));
+ gcc_assert (current_sched_info->flags & DO_SPECULATION);
+ bitmap_set_bit (&spec_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (elem));
}
+ }
+ }
#endif
+}
- free_INSN_LIST_node (link);
+/* A convenience wrapper to operate on an entire list. */
- found = 1;
- }
- else
- prev = link;
+static void
+add_dependence_list (rtx insn, rtx list, int uncond, enum reg_note dep_type)
+{
+ for (; list; list = XEXP (list, 1))
+ {
+ if (uncond || ! sched_insns_conditions_mutex_p (insn, XEXP (list, 0)))
+ add_dependence (insn, XEXP (list, 0), dep_type);
}
+}
- if (!found)
- abort ();
- return;
+/* Similar, but free *LISTP at the same time. */
+
+static void
+add_dependence_list_and_free (rtx insn, rtx *listp, int uncond,
+ enum reg_note dep_type)
+{
+ rtx list, next;
+ for (list = *listp, *listp = NULL; list ; list = next)
+ {
+ next = XEXP (list, 1);
+ if (uncond || ! sched_insns_conditions_mutex_p (insn, XEXP (list, 0)))
+ add_dependence (insn, XEXP (list, 0), dep_type);
+ free_INSN_LIST_node (list);
+ }
}
-/* Return an insn which represents a SCHED_GROUP, which is
- the last insn in the group. */
+/* Clear all dependencies for an insn. */
-static rtx
-group_leader (insn)
- rtx insn;
+static void
+delete_all_dependences (rtx insn)
{
- rtx prev;
+ /* Clear caches, if they exist, as well as free the dependence. */
- do
+#ifdef INSN_SCHEDULING
+ if (true_dependency_cache != NULL)
{
- prev = insn;
- insn = next_nonnote_insn (insn);
+ bitmap_clear (&true_dependency_cache[INSN_LUID (insn)]);
+ bitmap_clear (&output_dependency_cache[INSN_LUID (insn)]);
+ bitmap_clear (&anti_dependency_cache[INSN_LUID (insn)]);
+ /* We don't have to clear forward_dependency_cache here,
+ because it is formed later. */
+ if (current_sched_info->flags & DO_SPECULATION)
+ bitmap_clear (&spec_dependency_cache[INSN_LUID (insn)]);
}
- while (insn && SCHED_GROUP_P (insn) && (GET_CODE (insn) != CODE_LABEL));
+#endif
- return prev;
+ clear_deps_list (INSN_BACK_DEPS (insn));
}
-/* Set SCHED_GROUP_P and care for the rest of the bookkeeping that
- goes along with that. */
+/* 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
-set_sched_group_p (insn)
- rtx insn;
+fixup_sched_groups (rtx insn)
{
- rtx link, prev;
+ dep_link_t link;
+ rtx prev_nonnote;
- SCHED_GROUP_P (insn) = 1;
+ FOR_EACH_DEP_LINK (link, INSN_BACK_DEPS (insn))
+ {
+ rtx i = insn;
+ dep_t dep = DEP_LINK_DEP (link);
+ rtx pro = DEP_PRO (dep);
+
+ do
+ {
+ i = prev_nonnote_insn (i);
- /* There may be a note before this insn now, but all notes will
- be removed before we actually try to schedule the insns, so
- it won't cause a problem later. We must avoid it here though. */
- prev = prev_nonnote_insn (insn);
+ if (pro == i)
+ goto next_link;
+ } while (SCHED_GROUP_P (i));
- /* Make a copy of all dependencies on the immediately previous insn,
- and add to this insn. This is so that all the dependencies will
- apply to the group. Remove an explicit dependence on this insn
- as SCHED_GROUP_P now represents it. */
+ if (! sched_insns_conditions_mutex_p (i, pro))
+ add_dependence (i, pro, DEP_KIND (dep));
+ next_link:;
+ }
- if (find_insn_list (prev, LOG_LINKS (insn)))
- remove_dependence (insn, prev);
+ delete_all_dependences (insn);
- for (link = LOG_LINKS (prev); link; link = XEXP (link, 1))
- add_dependence (insn, XEXP (link, 0), REG_NOTE_KIND (link));
+ prev_nonnote = prev_nonnote_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);
}
\f
/* Process an insn's memory dependencies. There are four kinds of
(0) read dependence: read follows read
(1) true dependence: read follows write
- (2) anti dependence: write follows read
- (3) output dependence: write 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. */
The MEM is a memory reference contained within INSN, which we are saving
so that we can do memory aliasing on it. */
-void
-add_insn_mem_dependence (deps, insn_list, mem_list, insn, mem)
- struct deps *deps;
- rtx *insn_list, *mem_list, insn, mem;
+static void
+add_insn_mem_dependence (struct deps *deps, bool read_p,
+ rtx insn, rtx mem)
{
- register rtx link;
+ rtx *insn_list;
+ rtx *mem_list;
+ rtx link;
+
+ if (read_p)
+ {
+ insn_list = &deps->pending_read_insns;
+ mem_list = &deps->pending_read_mems;
+ deps->pending_read_list_length++;
+ }
+ else
+ {
+ insn_list = &deps->pending_write_insns;
+ mem_list = &deps->pending_write_mems;
+ deps->pending_write_list_length++;
+ }
link = alloc_INSN_LIST (insn, *insn_list);
*insn_list = link;
- link = alloc_EXPR_LIST (VOIDmode, mem, *mem_list);
+ if (current_sched_info->use_cselib)
+ {
+ mem = shallow_copy_rtx (mem);
+ XEXP (mem, 0) = cselib_subst_to_values (XEXP (mem, 0));
+ }
+ link = alloc_EXPR_LIST (VOIDmode, canon_rtx (mem), *mem_list);
*mem_list = link;
-
- deps->pending_lists_length++;
}
/* Make a dependency between every memory reference on the pending lists
- and INSN, thus flushing the pending lists. If ONLY_WRITE, don't flush
- the read list. */
+ 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 (deps, insn, only_write)
- struct deps *deps;
- rtx insn;
- int only_write;
+flush_pending_lists (struct deps *deps, rtx insn, int for_read,
+ int for_write)
{
- rtx u;
- rtx link;
-
- while (deps->pending_read_insns && ! only_write)
+ if (for_write)
{
- add_dependence (insn, XEXP (deps->pending_read_insns, 0),
- REG_DEP_ANTI);
+ add_dependence_list_and_free (insn, &deps->pending_read_insns, 1,
+ REG_DEP_ANTI);
+ free_EXPR_LIST_list (&deps->pending_read_mems);
+ deps->pending_read_list_length = 0;
+ }
- link = deps->pending_read_insns;
- deps->pending_read_insns = XEXP (deps->pending_read_insns, 1);
- free_INSN_LIST_node (link);
+ add_dependence_list_and_free (insn, &deps->pending_write_insns, 1,
+ for_read ? REG_DEP_ANTI : REG_DEP_OUTPUT);
+ free_EXPR_LIST_list (&deps->pending_write_mems);
+ deps->pending_write_list_length = 0;
- link = deps->pending_read_mems;
- deps->pending_read_mems = XEXP (deps->pending_read_mems, 1);
- free_EXPR_LIST_node (link);
- }
- while (deps->pending_write_insns)
- {
- add_dependence (insn, XEXP (deps->pending_write_insns, 0),
- REG_DEP_ANTI);
+ add_dependence_list_and_free (insn, &deps->last_pending_memory_flush, 1,
+ for_read ? REG_DEP_ANTI : REG_DEP_OUTPUT);
+ deps->last_pending_memory_flush = alloc_INSN_LIST (insn, NULL_RTX);
+ deps->pending_flush_length = 1;
+}
+\f
+/* 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. */
- link = deps->pending_write_insns;
- deps->pending_write_insns = XEXP (deps->pending_write_insns, 1);
- free_INSN_LIST_node (link);
+static void
+sched_analyze_reg (struct deps *deps, int regno, enum machine_mode mode,
+ enum rtx_code ref, rtx insn)
+{
+ /* 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)
+ SET_REGNO_REG_SET (reg_pending_sets, regno + i);
+ }
+ else if (ref == USE)
+ {
+ while (--i >= 0)
+ SET_REGNO_REG_SET (reg_pending_uses, regno + i);
+ }
+ else
+ {
+ while (--i >= 0)
+ SET_REGNO_REG_SET (reg_pending_clobbers, regno + i);
+ }
+ }
- link = deps->pending_write_mems;
- deps->pending_write_mems = XEXP (deps->pending_write_mems, 1);
- free_EXPR_LIST_node (link);
+ /* ??? 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);
}
- deps->pending_lists_length = 0;
- /* last_pending_memory_flush is now a list of insns. */
- for (u = deps->last_pending_memory_flush; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
+ else
+ {
+ if (ref == SET)
+ SET_REGNO_REG_SET (reg_pending_sets, regno);
+ else if (ref == USE)
+ SET_REGNO_REG_SET (reg_pending_uses, regno);
+ else
+ SET_REGNO_REG_SET (reg_pending_clobbers, regno);
- free_INSN_LIST_list (&deps->last_pending_memory_flush);
- deps->last_pending_memory_flush = alloc_INSN_LIST (insn, NULL_RTX);
+ /* 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 (ref == USE)
+ 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);
+ }
+ }
}
-\f
+
/* 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 (deps, x, insn)
- struct deps *deps;
- rtx x;
- rtx insn;
+sched_analyze_1 (struct deps *deps, rtx x, rtx insn)
{
- register int regno;
- register rtx dest = XEXP (x, 0);
+ rtx dest = XEXP (x, 0);
enum rtx_code code = GET_CODE (x);
if (dest == 0)
if (GET_CODE (dest) == PARALLEL)
{
- register int i;
+ int i;
for (i = XVECLEN (dest, 0) - 1; i >= 0; i--)
if (XEXP (XVECEXP (dest, 0, i), 0) != 0)
}
while (GET_CODE (dest) == STRICT_LOW_PART || GET_CODE (dest) == SUBREG
- || GET_CODE (dest) == ZERO_EXTRACT || GET_CODE (dest) == SIGN_EXTRACT)
+ || GET_CODE (dest) == ZERO_EXTRACT)
{
- if (GET_CODE (dest) == ZERO_EXTRACT || GET_CODE (dest) == SIGN_EXTRACT)
+ if (GET_CODE (dest) == STRICT_LOW_PART
+ || GET_CODE (dest) == ZERO_EXTRACT
+ || df_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);
dest = XEXP (dest, 0);
}
- if (GET_CODE (dest) == REG)
+ if (REG_P (dest))
{
- register int i;
-
- regno = REGNO (dest);
-
- /* 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)
- {
- i = HARD_REGNO_NREGS (regno, GET_MODE (dest));
- while (--i >= 0)
- {
- int r = regno + i;
- rtx u;
+ int regno = REGNO (dest);
+ enum machine_mode mode = GET_MODE (dest);
- for (u = deps->reg_last[r].uses; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
+ sched_analyze_reg (deps, regno, mode, code, insn);
- for (u = deps->reg_last[r].sets; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_OUTPUT);
-
- /* Clobbers need not be ordered with respect to one
- another, but sets must be ordered with respect to a
- pending clobber. */
- if (code == SET)
- {
- if (GET_CODE (PATTERN (insn)) != COND_EXEC)
- free_INSN_LIST_list (&deps->reg_last[r].uses);
- for (u = deps->reg_last[r].clobbers; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_OUTPUT);
- SET_REGNO_REG_SET (reg_pending_sets, r);
- }
- else
- SET_REGNO_REG_SET (reg_pending_clobbers, r);
-
- /* Function calls clobber all call_used regs. */
- if (global_regs[r] || (code == SET && call_used_regs[r]))
- for (u = deps->last_function_call; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
- }
- }
- /* ??? 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)
+#ifdef STACK_REGS
+ /* Treat all writes to a stack register as modifying the TOS. */
+ if (regno >= FIRST_STACK_REG && regno <= LAST_STACK_REG)
{
- if (GET_CODE (PATTERN (insn)) != USE
- && GET_CODE (PATTERN (insn)) != CLOBBER)
- abort ();
- }
- else
- {
- rtx u;
-
- for (u = deps->reg_last[regno].uses; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
-
- for (u = deps->reg_last[regno].sets; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_OUTPUT);
-
- if (code == SET)
- {
- if (GET_CODE (PATTERN (insn)) != COND_EXEC)
- free_INSN_LIST_list (&deps->reg_last[regno].uses);
- for (u = deps->reg_last[regno].clobbers; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_OUTPUT);
- SET_REGNO_REG_SET (reg_pending_sets, regno);
- }
- else
- SET_REGNO_REG_SET (reg_pending_clobbers, 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
- && reg_known_equiv_p[regno]
- && GET_CODE (reg_known_value[regno]) == MEM)
- sched_analyze_2 (deps, XEXP (reg_known_value[regno], 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)
- for (u = deps->last_function_call; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
+ /* Avoid analyzing the same register twice. */
+ if (regno != FIRST_STACK_REG)
+ sched_analyze_reg (deps, FIRST_STACK_REG, mode, code, insn);
+ sched_analyze_reg (deps, FIRST_STACK_REG, mode, USE, insn);
}
+#endif
}
- else if (GET_CODE (dest) == MEM)
+ else if (MEM_P (dest))
{
/* Writing memory. */
+ rtx t = dest;
- if (deps->pending_lists_length > 32)
+ if (current_sched_info->use_cselib)
+ {
+ t = shallow_copy_rtx (dest);
+ cselib_lookup (XEXP (t, 0), Pmode, 1);
+ XEXP (t, 0) = cselib_subst_to_values (XEXP (t, 0));
+ }
+ t = canon_rtx (t);
+
+ if ((deps->pending_read_list_length + deps->pending_write_list_length)
+ > 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. The number 32 was chosen because it
- seems like a reasonable number. When compiling GCC with itself,
+ these lists get long. When compiling GCC with itself,
this flush occurs 8 times for sparc, and 10 times for m88k using
- the number 32. */
- flush_pending_lists (deps, insn, 0);
+ the default value of 32. */
+ flush_pending_lists (deps, insn, false, true);
}
else
{
- rtx u;
rtx pending, pending_mem;
pending = deps->pending_read_insns;
pending_mem = deps->pending_read_mems;
while (pending)
{
- if (anti_dependence (XEXP (pending_mem, 0), dest))
+ if (anti_dependence (XEXP (pending_mem, 0), t)
+ && ! sched_insns_conditions_mutex_p (insn, XEXP (pending, 0)))
add_dependence (insn, XEXP (pending, 0), REG_DEP_ANTI);
pending = XEXP (pending, 1);
pending_mem = deps->pending_write_mems;
while (pending)
{
- if (output_dependence (XEXP (pending_mem, 0), dest))
+ if (output_dependence (XEXP (pending_mem, 0), t)
+ && ! sched_insns_conditions_mutex_p (insn, XEXP (pending, 0)))
add_dependence (insn, XEXP (pending, 0), REG_DEP_OUTPUT);
pending = XEXP (pending, 1);
pending_mem = XEXP (pending_mem, 1);
}
- for (u = deps->last_pending_memory_flush; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
+ add_dependence_list (insn, deps->last_pending_memory_flush, 1,
+ REG_DEP_ANTI);
- add_insn_mem_dependence (deps, &deps->pending_write_insns,
- &deps->pending_write_mems, insn, dest);
+ add_insn_mem_dependence (deps, false, insn, dest);
}
sched_analyze_2 (deps, XEXP (dest, 0), insn);
}
/* Analyze the uses of memory and registers in rtx X in INSN. */
static void
-sched_analyze_2 (deps, x, insn)
- struct deps *deps;
- rtx x;
- rtx insn;
+sched_analyze_2 (struct deps *deps, rtx x, rtx insn)
{
- register int i;
- register int j;
- register enum rtx_code code;
- register const char *fmt;
+ int i;
+ int j;
+ enum rtx_code code;
+ const char *fmt;
if (x == 0)
return;
{
case CONST_INT:
case CONST_DOUBLE:
+ case CONST_VECTOR:
case SYMBOL_REF:
case CONST:
case LABEL_REF:
#ifdef HAVE_cc0
case CC0:
/* User of CC0 depends on immediately preceding insn. */
- set_sched_group_p (insn);
+ SCHED_GROUP_P (insn) = 1;
+ /* Don't move CC0 setter to another block (it can set up the
+ same flag for previous CC0 users which is safe). */
+ CANT_MOVE (prev_nonnote_insn (insn)) = 1;
return;
#endif
case REG:
{
- rtx u;
int regno = REGNO (x);
- if (regno < FIRST_PSEUDO_REGISTER)
- {
- int i;
-
- i = HARD_REGNO_NREGS (regno, GET_MODE (x));
- while (--i >= 0)
- {
- int r = regno + i;
- deps->reg_last[r].uses
- = alloc_INSN_LIST (insn, deps->reg_last[r].uses);
- SET_REGNO_REG_SET (&deps->reg_last_in_use, r);
-
- for (u = deps->reg_last[r].sets; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), 0);
-
- /* ??? This should never happen. */
- for (u = deps->reg_last[r].clobbers; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), 0);
-
- if (call_used_regs[r] || global_regs[r])
- /* Function calls clobber all call_used regs. */
- for (u = deps->last_function_call; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
- }
- }
- /* ??? 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)
- {
- if (GET_CODE (PATTERN (insn)) != USE
- && GET_CODE (PATTERN (insn)) != CLOBBER)
- abort ();
- }
- else
- {
- deps->reg_last[regno].uses
- = alloc_INSN_LIST (insn, deps->reg_last[regno].uses);
- SET_REGNO_REG_SET (&deps->reg_last_in_use, regno);
-
- for (u = deps->reg_last[regno].sets; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), 0);
-
- /* ??? This should never happen. */
- for (u = deps->reg_last[regno].clobbers; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), 0);
-
- /* 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
- && reg_known_equiv_p[regno]
- && GET_CODE (reg_known_value[regno]) == MEM)
- sched_analyze_2 (deps, XEXP (reg_known_value[regno], 0), insn);
-
- /* If the register does not already cross any calls, then add this
- insn to the sched_before_next_call list so that it will still
- not cross calls after scheduling. */
- if (REG_N_CALLS_CROSSED (regno) == 0)
- add_dependence (deps->sched_before_next_call, insn,
- REG_DEP_ANTI);
- }
+ enum 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
return;
}
/* Reading memory. */
rtx u;
rtx pending, pending_mem;
+ rtx t = x;
+ if (current_sched_info->use_cselib)
+ {
+ t = shallow_copy_rtx (t);
+ cselib_lookup (XEXP (t, 0), Pmode, 1);
+ XEXP (t, 0) = cselib_subst_to_values (XEXP (t, 0));
+ }
+ t = canon_rtx (t);
pending = deps->pending_read_insns;
pending_mem = deps->pending_read_mems;
while (pending)
{
- if (read_dependence (XEXP (pending_mem, 0), x))
+ if (read_dependence (XEXP (pending_mem, 0), t)
+ && ! sched_insns_conditions_mutex_p (insn, XEXP (pending, 0)))
add_dependence (insn, XEXP (pending, 0), REG_DEP_ANTI);
pending = XEXP (pending, 1);
while (pending)
{
if (true_dependence (XEXP (pending_mem, 0), VOIDmode,
- x, rtx_varies_p))
- add_dependence (insn, XEXP (pending, 0), 0);
+ t, rtx_varies_p)
+ && ! sched_insns_conditions_mutex_p (insn, XEXP (pending, 0)))
+ {
+ if (current_sched_info->flags & DO_SPECULATION)
+ maybe_add_or_update_back_dep_1 (insn, XEXP (pending, 0),
+ REG_DEP_TRUE,
+ BEGIN_DATA | DEP_TRUE,
+ XEXP (pending_mem, 0), t, 0);
+ else
+ add_dependence (insn, XEXP (pending, 0), REG_DEP_TRUE);
+ }
pending = XEXP (pending, 1);
pending_mem = XEXP (pending_mem, 1);
}
for (u = deps->last_pending_memory_flush; u; u = XEXP (u, 1))
- if (GET_CODE (XEXP (u, 0)) != JUMP_INSN
- || deps_may_trap_p (x))
+ if (! JUMP_P (XEXP (u, 0)) || deps_may_trap_p (x))
add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
/* Always add these dependencies to pending_reads, since
this insn may be followed by a write. */
- add_insn_mem_dependence (deps, &deps->pending_read_insns,
- &deps->pending_read_mems, insn, x);
+ add_insn_mem_dependence (deps, true, insn, x);
/* Take advantage of tail recursion here. */
sched_analyze_2 (deps, XEXP (x, 0), insn);
/* Force pending stores to memory in case a trap handler needs them. */
case TRAP_IF:
- flush_pending_lists (deps, insn, 1);
+ flush_pending_lists (deps, insn, true, false);
break;
case ASM_OPERANDS:
case ASM_INPUT:
case UNSPEC_VOLATILE:
{
- rtx u;
-
/* 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.
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))
- {
- for (i = 0; i < deps->max_reg; i++)
- {
- struct deps_reg *reg_last = &deps->reg_last[i];
-
- for (u = reg_last->uses; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
- for (u = reg_last->sets; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), 0);
- for (u = reg_last->clobbers; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), 0);
-
- if (GET_CODE (PATTERN (insn)) != COND_EXEC)
- free_INSN_LIST_list (®_last->uses);
- }
- reg_pending_sets_all = 1;
-
- flush_pending_lists (deps, insn, 0);
- }
+ reg_pending_barrier = TRUE_BARRIER;
/* For all ASM_OPERANDS, we must traverse the vector of input operands.
We can not just fall through here since then we would be confused
/* Analyze an INSN with pattern X to find all dependencies. */
static void
-sched_analyze_insn (deps, x, insn, loop_notes)
- struct deps *deps;
- rtx x, insn;
- rtx loop_notes;
+sched_analyze_insn (struct deps *deps, rtx x, rtx insn)
{
- register RTX_CODE code = GET_CODE (x);
+ RTX_CODE code = GET_CODE (x);
rtx link;
- int i;
+ unsigned i;
+ reg_set_iterator rsi;
if (code == COND_EXEC)
{
sched_analyze_2 (deps, COND_EXEC_TEST (x), insn);
/* ??? Should be recording conditions so we reduce the number of
- false dependancies. */
+ false dependencies. */
x = COND_EXEC_CODE (x);
code = GET_CODE (x);
}
if (code == SET || code == CLOBBER)
- sched_analyze_1 (deps, x, insn);
+ {
+ sched_analyze_1 (deps, x, insn);
+
+ /* Bare clobber insns are used for letting life analysis, reg-stack
+ and others know that a value is dead. Depend on the last call
+ instruction so that reg-stack won't get confused. */
+ if (code == CLOBBER)
+ add_dependence_list (insn, deps->last_function_call, 1, REG_DEP_OUTPUT);
+ }
else if (code == PARALLEL)
{
- register int i;
- for (i = XVECLEN (x, 0) - 1; i >= 0; i--)
+ for (i = XVECLEN (x, 0); i--;)
{
rtx sub = XVECEXP (x, 0, i);
code = GET_CODE (sub);
sched_analyze_2 (deps, x, insn);
/* Mark registers CLOBBERED or used by called function. */
- if (GET_CODE (insn) == CALL_INSN)
- for (link = CALL_INSN_FUNCTION_USAGE (insn); link; link = XEXP (link, 1))
- {
- if (GET_CODE (XEXP (link, 0)) == CLOBBER)
- sched_analyze_1 (deps, XEXP (link, 0), insn);
- else
- sched_analyze_2 (deps, XEXP (link, 0), insn);
- }
+ if (CALL_P (insn))
+ {
+ for (link = CALL_INSN_FUNCTION_USAGE (insn); link; link = XEXP (link, 1))
+ {
+ if (GET_CODE (XEXP (link, 0)) == CLOBBER)
+ sched_analyze_1 (deps, XEXP (link, 0), insn);
+ else
+ sched_analyze_2 (deps, XEXP (link, 0), insn);
+ }
+ if (find_reg_note (insn, REG_SETJMP, NULL))
+ reg_pending_barrier = MOVE_BARRIER;
+ }
- if (GET_CODE (insn) == JUMP_INSN)
+ if (JUMP_P (insn))
{
- rtx next, u, pending, pending_mem;
+ rtx next;
next = next_nonnote_insn (insn);
- if (next && GET_CODE (next) == BARRIER)
+ if (next && BARRIER_P (next))
+ reg_pending_barrier = TRUE_BARRIER;
+ else
{
- for (i = 0; i < deps->max_reg; i++)
+ rtx pending, pending_mem;
+ regset_head tmp_uses, tmp_sets;
+ INIT_REG_SET (&tmp_uses);
+ INIT_REG_SET (&tmp_sets);
+
+ (*current_sched_info->compute_jump_reg_dependencies)
+ (insn, &deps->reg_conditional_sets, &tmp_uses, &tmp_sets);
+ /* Make latency of jump equal to 0 by using anti-dependence. */
+ EXECUTE_IF_SET_IN_REG_SET (&tmp_uses, 0, i, rsi)
{
struct deps_reg *reg_last = &deps->reg_last[i];
-
- for (u = reg_last->uses; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
- for (u = reg_last->sets; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
- for (u = reg_last->clobbers; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
+ add_dependence_list (insn, reg_last->sets, 0, REG_DEP_ANTI);
+ add_dependence_list (insn, reg_last->clobbers, 0, REG_DEP_ANTI);
+ reg_last->uses_length++;
+ reg_last->uses = alloc_INSN_LIST (insn, reg_last->uses);
}
- }
- else
- {
- regset_head tmp;
- INIT_REG_SET (&tmp);
+ IOR_REG_SET (reg_pending_sets, &tmp_sets);
+
+ CLEAR_REG_SET (&tmp_uses);
+ CLEAR_REG_SET (&tmp_sets);
- (*current_sched_info->compute_jump_reg_dependencies) (insn, &tmp);
- EXECUTE_IF_SET_IN_REG_SET (&tmp, 0, i,
+ /* All memory writes and volatile reads must happen before the
+ jump. Non-volatile reads must happen before the jump iff
+ the result is needed by the above register used mask. */
+
+ pending = deps->pending_write_insns;
+ pending_mem = deps->pending_write_mems;
+ while (pending)
{
- struct deps_reg *reg_last = &deps->reg_last[i];
- for (u = reg_last->sets; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
- reg_last->uses = alloc_INSN_LIST (insn, reg_last->uses);
- SET_REGNO_REG_SET (&deps->reg_last_in_use, i);
- });
+ if (! sched_insns_conditions_mutex_p (insn, XEXP (pending, 0)))
+ add_dependence (insn, XEXP (pending, 0), REG_DEP_OUTPUT);
+ pending = XEXP (pending, 1);
+ pending_mem = XEXP (pending_mem, 1);
+ }
- CLEAR_REG_SET (&tmp);
- }
- pending = deps->pending_write_insns;
- pending_mem = deps->pending_write_mems;
- while (pending)
- {
- add_dependence (insn, XEXP (pending, 0), 0);
+ pending = deps->pending_read_insns;
+ pending_mem = deps->pending_read_mems;
+ while (pending)
+ {
+ if (MEM_VOLATILE_P (XEXP (pending_mem, 0))
+ && ! sched_insns_conditions_mutex_p (insn, XEXP (pending, 0)))
+ add_dependence (insn, XEXP (pending, 0), REG_DEP_OUTPUT);
+ pending = XEXP (pending, 1);
+ pending_mem = XEXP (pending_mem, 1);
+ }
- pending = XEXP (pending, 1);
- pending_mem = XEXP (pending_mem, 1);
+ add_dependence_list (insn, deps->last_pending_memory_flush, 1,
+ REG_DEP_ANTI);
}
-
- for (u = deps->last_pending_memory_flush; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
}
- /* If there is a {LOOP,EHREGION}_{BEG,END} note in the middle of a basic
- block, then we must be sure that no instructions are scheduled across it.
- Otherwise, the reg_n_refs info (which depends on loop_depth) would
- become incorrect. */
+ /* If this instruction can throw an exception, then moving it changes
+ where block boundaries fall. This is mighty confusing elsewhere.
+ Therefore, prevent such an instruction from being moved. */
+ if (can_throw_internal (insn))
+ reg_pending_barrier = MOVE_BARRIER;
- if (loop_notes)
+ /* Add dependencies if a scheduling barrier was found. */
+ if (reg_pending_barrier)
{
- int schedule_barrier_found = 0;
- rtx link;
-
- /* Update loop_notes with any notes from this insn. Also determine
- if any of the notes on the list correspond to instruction scheduling
- barriers (loop, eh & setjmp notes, but not range notes. */
- link = loop_notes;
- while (XEXP (link, 1))
+ /* In the case of barrier the most added dependencies are not
+ real, so we use anti-dependence here. */
+ if (sched_get_condition (insn))
{
- if (INTVAL (XEXP (link, 0)) == NOTE_INSN_LOOP_BEG
- || INTVAL (XEXP (link, 0)) == NOTE_INSN_LOOP_END
- || INTVAL (XEXP (link, 0)) == NOTE_INSN_EH_REGION_BEG
- || INTVAL (XEXP (link, 0)) == NOTE_INSN_EH_REGION_END
- || INTVAL (XEXP (link, 0)) == NOTE_INSN_SETJMP)
- schedule_barrier_found = 1;
-
- link = XEXP (link, 1);
+ EXECUTE_IF_SET_IN_REG_SET (&deps->reg_last_in_use, 0, i, rsi)
+ {
+ struct deps_reg *reg_last = &deps->reg_last[i];
+ add_dependence_list (insn, reg_last->uses, 0, REG_DEP_ANTI);
+ add_dependence_list
+ (insn, reg_last->sets, 0,
+ reg_pending_barrier == TRUE_BARRIER ? REG_DEP_TRUE : REG_DEP_ANTI);
+ add_dependence_list
+ (insn, reg_last->clobbers, 0,
+ reg_pending_barrier == TRUE_BARRIER ? REG_DEP_TRUE : REG_DEP_ANTI);
+ }
}
- XEXP (link, 1) = REG_NOTES (insn);
- REG_NOTES (insn) = loop_notes;
-
- /* Add dependencies if a scheduling barrier was found. */
- if (schedule_barrier_found)
+ else
{
- for (i = 0; i < deps->max_reg; i++)
+ EXECUTE_IF_SET_IN_REG_SET (&deps->reg_last_in_use, 0, i, rsi)
{
struct deps_reg *reg_last = &deps->reg_last[i];
- rtx u;
-
- for (u = reg_last->uses; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
- for (u = reg_last->sets; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), 0);
- for (u = reg_last->clobbers; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), 0);
-
- if (GET_CODE (PATTERN (insn)) != COND_EXEC)
- free_INSN_LIST_list (®_last->uses);
+ add_dependence_list_and_free (insn, ®_last->uses, 0,
+ REG_DEP_ANTI);
+ add_dependence_list_and_free
+ (insn, ®_last->sets, 0,
+ reg_pending_barrier == TRUE_BARRIER ? REG_DEP_TRUE : REG_DEP_ANTI);
+ add_dependence_list_and_free
+ (insn, ®_last->clobbers, 0,
+ reg_pending_barrier == TRUE_BARRIER ? REG_DEP_TRUE : REG_DEP_ANTI);
+ reg_last->uses_length = 0;
+ reg_last->clobbers_length = 0;
}
- reg_pending_sets_all = 1;
-
- flush_pending_lists (deps, insn, 0);
}
- }
-
- /* Accumulate clobbers until the next set so that it will be output
- dependent on all of them. At the next set we can clear the clobber
- list, since subsequent sets will be output dependent on it. */
- if (reg_pending_sets_all)
- {
- reg_pending_sets_all = 0;
- for (i = 0; i < deps->max_reg; i++)
+ for (i = 0; i < (unsigned)deps->max_reg; i++)
{
struct deps_reg *reg_last = &deps->reg_last[i];
- if (GET_CODE (PATTERN (insn)) != COND_EXEC)
- {
- free_INSN_LIST_list (®_last->sets);
- free_INSN_LIST_list (®_last->clobbers);
- }
reg_last->sets = alloc_INSN_LIST (insn, reg_last->sets);
SET_REGNO_REG_SET (&deps->reg_last_in_use, i);
}
+
+ flush_pending_lists (deps, insn, true, true);
+ CLEAR_REG_SET (&deps->reg_conditional_sets);
+ reg_pending_barrier = NOT_A_BARRIER;
}
else
{
- EXECUTE_IF_SET_IN_REG_SET (reg_pending_sets, 0, i,
+ /* If the current insn is conditional, we can't free any
+ of the lists. */
+ if (sched_get_condition (insn))
{
- struct deps_reg *reg_last = &deps->reg_last[i];
- if (GET_CODE (PATTERN (insn)) != COND_EXEC)
+ EXECUTE_IF_SET_IN_REG_SET (reg_pending_uses, 0, i, rsi)
{
- free_INSN_LIST_list (®_last->sets);
- free_INSN_LIST_list (®_last->clobbers);
+ struct deps_reg *reg_last = &deps->reg_last[i];
+ add_dependence_list (insn, reg_last->sets, 0, REG_DEP_TRUE);
+ add_dependence_list (insn, reg_last->clobbers, 0, REG_DEP_TRUE);
+ reg_last->uses = alloc_INSN_LIST (insn, reg_last->uses);
+ reg_last->uses_length++;
}
- reg_last->sets = alloc_INSN_LIST (insn, reg_last->sets);
- SET_REGNO_REG_SET (&deps->reg_last_in_use, i);
- });
- EXECUTE_IF_SET_IN_REG_SET (reg_pending_clobbers, 0, i,
+ EXECUTE_IF_SET_IN_REG_SET (reg_pending_clobbers, 0, i, rsi)
+ {
+ struct deps_reg *reg_last = &deps->reg_last[i];
+ add_dependence_list (insn, reg_last->sets, 0, REG_DEP_OUTPUT);
+ add_dependence_list (insn, reg_last->uses, 0, REG_DEP_ANTI);
+ reg_last->clobbers = alloc_INSN_LIST (insn, reg_last->clobbers);
+ reg_last->clobbers_length++;
+ }
+ EXECUTE_IF_SET_IN_REG_SET (reg_pending_sets, 0, i, rsi)
+ {
+ struct deps_reg *reg_last = &deps->reg_last[i];
+ add_dependence_list (insn, reg_last->sets, 0, REG_DEP_OUTPUT);
+ add_dependence_list (insn, reg_last->clobbers, 0, REG_DEP_OUTPUT);
+ add_dependence_list (insn, reg_last->uses, 0, REG_DEP_ANTI);
+ reg_last->sets = alloc_INSN_LIST (insn, reg_last->sets);
+ SET_REGNO_REG_SET (&deps->reg_conditional_sets, i);
+ }
+ }
+ else
{
- struct deps_reg *reg_last = &deps->reg_last[i];
- reg_last->clobbers = alloc_INSN_LIST (insn, reg_last->clobbers);
- SET_REGNO_REG_SET (&deps->reg_last_in_use, i);
- });
+ EXECUTE_IF_SET_IN_REG_SET (reg_pending_uses, 0, i, rsi)
+ {
+ struct deps_reg *reg_last = &deps->reg_last[i];
+ add_dependence_list (insn, reg_last->sets, 0, REG_DEP_TRUE);
+ add_dependence_list (insn, reg_last->clobbers, 0, REG_DEP_TRUE);
+ reg_last->uses_length++;
+ reg_last->uses = alloc_INSN_LIST (insn, reg_last->uses);
+ }
+ EXECUTE_IF_SET_IN_REG_SET (reg_pending_clobbers, 0, i, rsi)
+ {
+ struct deps_reg *reg_last = &deps->reg_last[i];
+ if (reg_last->uses_length > MAX_PENDING_LIST_LENGTH
+ || reg_last->clobbers_length > MAX_PENDING_LIST_LENGTH)
+ {
+ add_dependence_list_and_free (insn, ®_last->sets, 0,
+ REG_DEP_OUTPUT);
+ add_dependence_list_and_free (insn, ®_last->uses, 0,
+ REG_DEP_ANTI);
+ add_dependence_list_and_free (insn, ®_last->clobbers, 0,
+ REG_DEP_OUTPUT);
+ reg_last->sets = alloc_INSN_LIST (insn, reg_last->sets);
+ reg_last->clobbers_length = 0;
+ reg_last->uses_length = 0;
+ }
+ else
+ {
+ add_dependence_list (insn, reg_last->sets, 0, REG_DEP_OUTPUT);
+ add_dependence_list (insn, reg_last->uses, 0, REG_DEP_ANTI);
+ }
+ reg_last->clobbers_length++;
+ reg_last->clobbers = alloc_INSN_LIST (insn, reg_last->clobbers);
+ }
+ EXECUTE_IF_SET_IN_REG_SET (reg_pending_sets, 0, i, rsi)
+ {
+ struct deps_reg *reg_last = &deps->reg_last[i];
+ add_dependence_list_and_free (insn, ®_last->sets, 0,
+ REG_DEP_OUTPUT);
+ add_dependence_list_and_free (insn, ®_last->clobbers, 0,
+ REG_DEP_OUTPUT);
+ add_dependence_list_and_free (insn, ®_last->uses, 0,
+ REG_DEP_ANTI);
+ reg_last->sets = alloc_INSN_LIST (insn, reg_last->sets);
+ reg_last->uses_length = 0;
+ reg_last->clobbers_length = 0;
+ CLEAR_REGNO_REG_SET (&deps->reg_conditional_sets, i);
+ }
+ }
+
+ IOR_REG_SET (&deps->reg_last_in_use, reg_pending_uses);
+ IOR_REG_SET (&deps->reg_last_in_use, reg_pending_clobbers);
+ IOR_REG_SET (&deps->reg_last_in_use, reg_pending_sets);
}
- CLEAR_REG_SET (reg_pending_sets);
+ CLEAR_REG_SET (reg_pending_uses);
CLEAR_REG_SET (reg_pending_clobbers);
+ CLEAR_REG_SET (reg_pending_sets);
+
+ /* If we are currently in a libcall scheduling group, then mark the
+ current insn as being in a scheduling group and that it can not
+ be moved into a different basic block. */
+
+ if (deps->libcall_block_tail_insn)
+ {
+ SCHED_GROUP_P (insn) = 1;
+ CANT_MOVE (insn) = 1;
+ }
/* If a post-call group is still open, see if it should remain so.
This insn must be a simple move of a hard reg to a pseudo or
tmp = SET_DEST (set);
if (GET_CODE (tmp) == SUBREG)
tmp = SUBREG_REG (tmp);
- if (GET_CODE (tmp) == REG)
+ if (REG_P (tmp))
dest_regno = REGNO (tmp);
else
goto end_call_group;
tmp = SET_SRC (set);
if (GET_CODE (tmp) == SUBREG)
tmp = SUBREG_REG (tmp);
- if (GET_CODE (tmp) == REG)
+ if ((GET_CODE (tmp) == PLUS
+ || GET_CODE (tmp) == MINUS)
+ && REG_P (XEXP (tmp, 0))
+ && REGNO (XEXP (tmp, 0)) == STACK_POINTER_REGNUM
+ && dest_regno == STACK_POINTER_REGNUM)
+ src_regno = STACK_POINTER_REGNUM;
+ else if (REG_P (tmp))
src_regno = REGNO (tmp);
else
goto end_call_group;
if (src_regno < FIRST_PSEUDO_REGISTER
|| dest_regno < FIRST_PSEUDO_REGISTER)
{
- set_sched_group_p (insn);
+ if (deps->in_post_call_group_p == post_call_initial)
+ deps->in_post_call_group_p = post_call;
+
+ SCHED_GROUP_P (insn) = 1;
CANT_MOVE (insn) = 1;
}
else
{
end_call_group:
- deps->in_post_call_group_p = 0;
+ deps->in_post_call_group_p = not_post_call;
}
}
+
+ /* Fixup the dependencies in the sched group. */
+ if (SCHED_GROUP_P (insn))
+ fixup_sched_groups (insn);
}
-/* Analyze every insn between HEAD and TAIL inclusive, creating LOG_LINKS
- for every dependency. */
+/* Analyze every insn between HEAD and TAIL inclusive, creating backward
+ dependencies for each insn. */
void
-sched_analyze (deps, head, tail)
- struct deps *deps;
- rtx head, tail;
+sched_analyze (struct deps *deps, rtx head, rtx tail)
{
- register rtx insn;
- register rtx u;
- rtx loop_notes = 0;
+ rtx insn;
+ if (current_sched_info->use_cselib)
+ cselib_init (true);
+
+ /* Before reload, if the previous block ended in a call, show that
+ we are inside a post-call group, so as to keep the lifetimes of
+ hard registers correct. */
+ if (! reload_completed && !LABEL_P (head))
+ {
+ insn = prev_nonnote_insn (head);
+ if (insn && CALL_P (insn))
+ deps->in_post_call_group_p = post_call_initial;
+ }
for (insn = head;; insn = NEXT_INSN (insn))
{
- if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN)
+ rtx link, end_seq, r0, set;
+
+ if (INSN_P (insn))
{
/* Clear out the stale LOG_LINKS from flow. */
free_INSN_LIST_list (&LOG_LINKS (insn));
- /* Clear out stale SCHED_GROUP_P. */
- SCHED_GROUP_P (insn) = 0;
+ /* These two lists will be freed in schedule_insn (). */
+ INSN_BACK_DEPS (insn) = create_deps_list (false);
+ INSN_RESOLVED_BACK_DEPS (insn) = create_deps_list (false);
+
+ /* This one should be allocated on the obstack because it should live
+ till the scheduling ends. */
+ INSN_FORW_DEPS (insn) = create_deps_list (true);
+ }
+ if (NONJUMP_INSN_P (insn) || JUMP_P (insn))
+ {
/* Make each JUMP_INSN a scheduling barrier for memory
references. */
- if (GET_CODE (insn) == JUMP_INSN)
- deps->last_pending_memory_flush
- = alloc_INSN_LIST (insn, deps->last_pending_memory_flush);
- sched_analyze_insn (deps, PATTERN (insn), insn, loop_notes);
- loop_notes = 0;
+ if (JUMP_P (insn))
+ {
+ /* Keep the list a reasonable size. */
+ if (deps->pending_flush_length++ > MAX_PENDING_LIST_LENGTH)
+ flush_pending_lists (deps, insn, true, true);
+ else
+ deps->last_pending_memory_flush
+ = alloc_INSN_LIST (insn, deps->last_pending_memory_flush);
+ }
+ sched_analyze_insn (deps, PATTERN (insn), insn);
}
- else if (GET_CODE (insn) == CALL_INSN)
+ else if (CALL_P (insn))
{
- rtx x;
- register int i;
-
- /* Clear out stale SCHED_GROUP_P. */
- SCHED_GROUP_P (insn) = 0;
+ int i;
CANT_MOVE (insn) = 1;
- /* Clear out the stale LOG_LINKS from flow. */
- free_INSN_LIST_list (&LOG_LINKS (insn));
-
- /* Any instruction using a hard register which may get clobbered
- by a call needs to be marked as dependent on this call.
- This prevents a use of a hard return reg from being moved
- past a void call (i.e. it does not explicitly set the hard
- return reg). */
-
- /* If this call is followed by a NOTE_INSN_SETJMP, then assume that
- all registers, not just hard registers, may be clobbered by this
- call. */
-
- /* Insn, being a CALL_INSN, magically depends on
- `last_function_call' already. */
-
- if (NEXT_INSN (insn) && GET_CODE (NEXT_INSN (insn)) == NOTE
- && NOTE_LINE_NUMBER (NEXT_INSN (insn)) == NOTE_INSN_SETJMP)
+ if (find_reg_note (insn, REG_SETJMP, NULL))
{
- for (i = 0; i < deps->max_reg; i++)
- {
- struct deps_reg *reg_last = &deps->reg_last[i];
-
- for (u = reg_last->uses; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
- for (u = reg_last->sets; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), 0);
- for (u = reg_last->clobbers; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), 0);
-
- free_INSN_LIST_list (®_last->uses);
- }
- reg_pending_sets_all = 1;
-
- /* Add a pair of REG_SAVE_NOTEs which we will later
- convert back into a NOTE_INSN_SETJMP note. See
- reemit_notes for why we use a pair of NOTEs. */
- REG_NOTES (insn) = alloc_EXPR_LIST (REG_SAVE_NOTE,
- GEN_INT (0),
- REG_NOTES (insn));
- REG_NOTES (insn) = alloc_EXPR_LIST (REG_SAVE_NOTE,
- GEN_INT (NOTE_INSN_SETJMP),
- REG_NOTES (insn));
+ /* This is setjmp. Assume that all registers, not just
+ hard registers, may be clobbered by this call. */
+ reg_pending_barrier = MOVE_BARRIER;
}
else
{
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
- if (call_used_regs[i] || global_regs[i])
+ /* A call may read and modify global register variables. */
+ if (global_regs[i])
{
- for (u = deps->reg_last[i].uses; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
- for (u = deps->reg_last[i].sets; u; u = XEXP (u, 1))
- add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI);
-
- SET_REGNO_REG_SET (reg_pending_clobbers, i);
+ SET_REGNO_REG_SET (reg_pending_sets, i);
+ SET_REGNO_REG_SET (reg_pending_uses, i);
}
+ /* Other call-clobbered hard regs may be clobbered.
+ Since we only have a choice between 'might be clobbered'
+ and 'definitely not clobbered', we must include all
+ partly call-clobbered registers here. */
+ else if (HARD_REGNO_CALL_PART_CLOBBERED (i, reg_raw_mode[i])
+ || TEST_HARD_REG_BIT (regs_invalidated_by_call, i))
+ SET_REGNO_REG_SET (reg_pending_clobbers, i);
+ /* We don't know what set of fixed registers might be used
+ by the function, but it is certain that the stack pointer
+ is among them, but be conservative. */
+ else if (fixed_regs[i])
+ SET_REGNO_REG_SET (reg_pending_uses, i);
+ /* The frame pointer is normally not used by the function
+ itself, but by the debugger. */
+ /* ??? MIPS o32 is an exception. It uses the frame pointer
+ in the macro expansion of jal but does not represent this
+ fact in the call_insn rtl. */
+ else if (i == FRAME_POINTER_REGNUM
+ || (i == HARD_FRAME_POINTER_REGNUM
+ && (! reload_completed || frame_pointer_needed)))
+ SET_REGNO_REG_SET (reg_pending_uses, i);
}
/* For each insn which shouldn't cross a call, add a dependence
between that insn and this call insn. */
- x = LOG_LINKS (deps->sched_before_next_call);
- while (x)
- {
- add_dependence (insn, XEXP (x, 0), REG_DEP_ANTI);
- x = XEXP (x, 1);
- }
- free_INSN_LIST_list (&LOG_LINKS (deps->sched_before_next_call));
+ add_dependence_list_and_free (insn, &deps->sched_before_next_call, 1,
+ REG_DEP_ANTI);
- sched_analyze_insn (deps, PATTERN (insn), insn, loop_notes);
- loop_notes = 0;
+ sched_analyze_insn (deps, PATTERN (insn), insn);
/* In the absence of interprocedural alias analysis, we must flush
all pending reads and writes, and start new dependencies starting
from here. But only flush writes for constant calls (which may
be passed a pointer to something we haven't written yet). */
- flush_pending_lists (deps, insn, CONST_CALL_P (insn));
+ flush_pending_lists (deps, insn, true, !CONST_OR_PURE_CALL_P (insn));
- /* Depend this function call (actually, the user of this
- function call) on all hard register clobberage. */
-
- /* last_function_call is now a list of insns. */
+ /* Remember the last function call for limiting lifetimes. */
free_INSN_LIST_list (&deps->last_function_call);
deps->last_function_call = alloc_INSN_LIST (insn, NULL_RTX);
/* Before reload, begin a post-call group, so as to keep the
lifetimes of hard registers correct. */
if (! reload_completed)
- deps->in_post_call_group_p = 1;
+ deps->in_post_call_group_p = post_call;
}
- /* See comments on reemit_notes as to why we do this.
- ??? Actually, the reemit_notes just say what is done, not why. */
+ /* EH_REGION insn notes can not appear until well after we complete
+ scheduling. */
+ if (NOTE_P (insn))
+ gcc_assert (NOTE_LINE_NUMBER (insn) != NOTE_INSN_EH_REGION_BEG
+ && NOTE_LINE_NUMBER (insn) != NOTE_INSN_EH_REGION_END);
+
+ if (current_sched_info->use_cselib)
+ cselib_process_insn (insn);
+
+ /* Now that we have completed handling INSN, check and see if it is
+ a CLOBBER beginning a libcall block. If it is, record the
+ end of the libcall sequence.
+
+ We want to schedule libcall blocks as a unit before reload. While
+ this restricts scheduling, it preserves the meaning of a libcall
+ block.
+
+ As a side effect, we may get better code due to decreased register
+ pressure as well as less chance of a foreign insn appearing in
+ a libcall block. */
+ if (!reload_completed
+ /* Note we may have nested libcall sequences. We only care about
+ the outermost libcall sequence. */
+ && deps->libcall_block_tail_insn == 0
+ /* The sequence must start with a clobber of a register. */
+ && NONJUMP_INSN_P (insn)
+ && GET_CODE (PATTERN (insn)) == CLOBBER
+ && (r0 = XEXP (PATTERN (insn), 0), REG_P (r0))
+ && REG_P (XEXP (PATTERN (insn), 0))
+ /* The CLOBBER must also have a REG_LIBCALL note attached. */
+ && (link = find_reg_note (insn, REG_LIBCALL, NULL_RTX)) != 0
+ && (end_seq = XEXP (link, 0)) != 0
+ /* The insn referenced by the REG_LIBCALL note must be a
+ simple nop copy with the same destination as the register
+ mentioned in the clobber. */
+ && (set = single_set (end_seq)) != 0
+ && SET_DEST (set) == r0 && SET_SRC (set) == r0
+ /* And finally the insn referenced by the REG_LIBCALL must
+ also contain a REG_EQUAL note and a REG_RETVAL note. */
+ && find_reg_note (end_seq, REG_EQUAL, NULL_RTX) != 0
+ && find_reg_note (end_seq, REG_RETVAL, NULL_RTX) != 0)
+ deps->libcall_block_tail_insn = XEXP (link, 0);
+
+ /* If we have reached the end of a libcall block, then close the
+ block. */
+ if (deps->libcall_block_tail_insn == insn)
+ deps->libcall_block_tail_insn = 0;
- else if (GET_CODE (insn) == NOTE
- && (NOTE_LINE_NUMBER (insn) == NOTE_INSN_RANGE_BEG
- || NOTE_LINE_NUMBER (insn) == NOTE_INSN_RANGE_END))
+ if (insn == tail)
{
- loop_notes = alloc_EXPR_LIST (REG_SAVE_NOTE, NOTE_RANGE_INFO (insn),
- loop_notes);
- loop_notes = alloc_EXPR_LIST (REG_SAVE_NOTE,
- GEN_INT (NOTE_LINE_NUMBER (insn)),
- loop_notes);
+ if (current_sched_info->use_cselib)
+ cselib_finish ();
+ return;
}
- else if (GET_CODE (insn) == NOTE
- && (NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_BEG
- || NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_END
- || NOTE_LINE_NUMBER (insn) == NOTE_INSN_EH_REGION_BEG
- || NOTE_LINE_NUMBER (insn) == NOTE_INSN_EH_REGION_END
- || (NOTE_LINE_NUMBER (insn) == NOTE_INSN_SETJMP
- && GET_CODE (PREV_INSN (insn)) != CALL_INSN)))
- {
- rtx rtx_region;
+ }
+ gcc_unreachable ();
+}
+\f
- if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_EH_REGION_BEG
- || NOTE_LINE_NUMBER (insn) == NOTE_INSN_EH_REGION_END)
- rtx_region = GEN_INT (NOTE_EH_HANDLER (insn));
- else
- rtx_region = GEN_INT (0);
-
- loop_notes = alloc_EXPR_LIST (REG_SAVE_NOTE,
- rtx_region,
- loop_notes);
- loop_notes = alloc_EXPR_LIST (REG_SAVE_NOTE,
- GEN_INT (NOTE_LINE_NUMBER (insn)),
- loop_notes);
- CONST_CALL_P (loop_notes) = CONST_CALL_P (insn);
- }
+/* The following function adds forward dependence (FROM, TO) with
+ given DEP_TYPE. The forward dependence should be not exist before. */
- if (insn == tail)
- return;
+void
+add_forw_dep (dep_link_t link)
+{
+ dep_t dep = DEP_LINK_DEP (link);
+ rtx to = DEP_CON (dep);
+ rtx from = DEP_PRO (dep);
+
+#ifdef ENABLE_CHECKING
+ /* If add_dependence is working properly there should never
+ be notes, deleted insns or duplicates in the backward
+ links. Thus we need not check for them here.
+
+ However, if we have enabled checking we might as well go
+ ahead and verify that add_dependence worked properly. */
+ gcc_assert (INSN_P (from));
+ gcc_assert (!INSN_DELETED_P (from));
+ if (true_dependency_cache)
+ {
+ gcc_assert (!bitmap_bit_p (&forward_dependency_cache[INSN_LUID (from)],
+ INSN_LUID (to)));
+ bitmap_set_bit (&forward_dependency_cache[INSN_LUID (from)],
+ INSN_LUID (to));
}
- abort ();
+
+ gcc_assert (find_link_by_con_in_deps_list (INSN_FORW_DEPS (from), to)
+ == NULL);
+#endif
+
+ add_to_deps_list (DEP_NODE_FORW (DEP_LINK_NODE (link)),
+ INSN_FORW_DEPS (from));
+
+ INSN_DEP_COUNT (to) += 1;
}
-\f
+
/* Examine insns in the range [ HEAD, TAIL ] and Use the backward
- dependences from LOG_LINKS to build forward dependences in
- INSN_DEPEND. */
+ dependences from INSN_BACK_DEPS list to build forward dependences in
+ INSN_FORW_DEPS. */
void
-compute_forward_dependences (head, tail)
- rtx head, tail;
+compute_forward_dependences (rtx head, rtx tail)
{
- rtx insn, link;
+ rtx insn;
rtx next_tail;
- enum reg_note dep_type;
next_tail = NEXT_INSN (tail);
for (insn = head; insn != next_tail; insn = NEXT_INSN (insn))
{
+ dep_link_t link;
+
if (! INSN_P (insn))
continue;
+
+ if (current_sched_info->flags & DO_SPECULATION)
+ {
+ /* We will add links, preserving order, from INSN_BACK_DEPS to
+ NEW. */
+ dep_link_t new = NULL;
- insn = group_leader (insn);
+ link = DEPS_LIST_FIRST (INSN_BACK_DEPS (insn));
- for (link = LOG_LINKS (insn); link; link = XEXP (link, 1))
- {
- rtx x = group_leader (XEXP (link, 0));
- rtx new_link;
+ while (link != NULL)
+ {
+ dep_link_t next = DEP_LINK_NEXT (link);
- if (x != XEXP (link, 0))
- continue;
+ detach_dep_link (link);
+ adjust_add_sorted_back_dep (insn, link, &new);
-#ifdef ENABLE_CHECKING
- /* If add_dependence is working properly there should never
- be notes, deleted insns or duplicates in the backward
- links. Thus we need not check for them here.
-
- However, if we have enabled checking we might as well go
- ahead and verify that add_dependence worked properly. */
- if (GET_CODE (x) == NOTE
- || INSN_DELETED_P (x)
- || (forward_dependency_cache != NULL
- && TEST_BIT (forward_dependency_cache[INSN_LUID (x)],
- INSN_LUID (insn)))
- || (forward_dependency_cache == NULL
- && find_insn_list (insn, INSN_DEPEND (x))))
- abort ();
- if (forward_dependency_cache != NULL)
- SET_BIT (forward_dependency_cache[INSN_LUID (x)],
- INSN_LUID (insn));
-#endif
+ link = next;
+ }
- new_link = alloc_INSN_LIST (insn, INSN_DEPEND (x));
+ /* Attach NEW to be the list of backward dependencies. */
+ if (new != NULL)
+ {
+ DEP_LINK_PREV_NEXTP (new)
+ = &DEPS_LIST_FIRST (INSN_BACK_DEPS (insn));
- dep_type = REG_NOTE_KIND (link);
- PUT_REG_NOTE_KIND (new_link, dep_type);
+ DEPS_LIST_FIRST (INSN_BACK_DEPS (insn)) = new;
+ }
+ }
- INSN_DEPEND (x) = new_link;
- INSN_DEP_COUNT (insn) += 1;
- }
+ FOR_EACH_DEP_LINK (link, INSN_BACK_DEPS (insn))
+ add_forw_dep (link);
}
}
\f
n_bbs is the number of region blocks. */
void
-init_deps (deps)
- struct deps *deps;
+init_deps (struct deps *deps)
{
int max_reg = (reload_completed ? FIRST_PSEUDO_REGISTER : max_reg_num ());
deps->max_reg = max_reg;
- deps->reg_last = (struct deps_reg *)
- xcalloc (max_reg, sizeof (struct deps_reg));
+ deps->reg_last = XCNEWVEC (struct deps_reg, max_reg);
INIT_REG_SET (&deps->reg_last_in_use);
+ INIT_REG_SET (&deps->reg_conditional_sets);
deps->pending_read_insns = 0;
deps->pending_read_mems = 0;
deps->pending_write_insns = 0;
deps->pending_write_mems = 0;
- deps->pending_lists_length = 0;
+ deps->pending_read_list_length = 0;
+ deps->pending_write_list_length = 0;
+ deps->pending_flush_length = 0;
deps->last_pending_memory_flush = 0;
deps->last_function_call = 0;
- deps->in_post_call_group_p = 0;
-
- deps->sched_before_next_call
- = gen_rtx_INSN (VOIDmode, 0, NULL_RTX, NULL_RTX,
- NULL_RTX, 0, NULL_RTX, NULL_RTX);
- LOG_LINKS (deps->sched_before_next_call) = 0;
+ deps->sched_before_next_call = 0;
+ deps->in_post_call_group_p = not_post_call;
+ deps->libcall_block_tail_insn = 0;
}
/* Free insn lists found in DEPS. */
void
-free_deps (deps)
- struct deps *deps;
+free_deps (struct deps *deps)
{
- int i;
+ unsigned i;
+ reg_set_iterator rsi;
+
+ free_INSN_LIST_list (&deps->pending_read_insns);
+ free_EXPR_LIST_list (&deps->pending_read_mems);
+ free_INSN_LIST_list (&deps->pending_write_insns);
+ free_EXPR_LIST_list (&deps->pending_write_mems);
+ free_INSN_LIST_list (&deps->last_pending_memory_flush);
/* Without the EXECUTE_IF_SET, this loop is executed max_reg * nr_regions
- times. For a test case with 42000 regs and 8000 small basic blocks,
+ times. For a testcase with 42000 regs and 8000 small basic blocks,
this loop accounted for nearly 60% (84 sec) of the total -O2 runtime. */
- EXECUTE_IF_SET_IN_REG_SET (&deps->reg_last_in_use, 0, i,
+ EXECUTE_IF_SET_IN_REG_SET (&deps->reg_last_in_use, 0, i, rsi)
{
struct deps_reg *reg_last = &deps->reg_last[i];
- free_INSN_LIST_list (®_last->uses);
- free_INSN_LIST_list (®_last->sets);
- free_INSN_LIST_list (®_last->clobbers);
- });
+ if (reg_last->uses)
+ free_INSN_LIST_list (®_last->uses);
+ if (reg_last->sets)
+ free_INSN_LIST_list (®_last->sets);
+ if (reg_last->clobbers)
+ free_INSN_LIST_list (®_last->clobbers);
+ }
CLEAR_REG_SET (&deps->reg_last_in_use);
+ CLEAR_REG_SET (&deps->reg_conditional_sets);
free (deps->reg_last);
- deps->reg_last = NULL;
}
/* If it is profitable to use them, initialize caches for tracking
- dependency informatino. LUID is the number of insns to be scheduled,
+ dependency information. LUID is the number of insns to be scheduled,
it is used in the estimate of profitability. */
void
-init_dependency_caches (luid)
- int luid;
+init_dependency_caches (int luid)
{
/* ?!? We could save some memory by computing a per-region luid mapping
which could reduce both the number of vectors in the cache and the size
what we consider "very high". */
if (luid / n_basic_blocks > 100 * 5)
{
- true_dependency_cache = sbitmap_vector_alloc (luid, luid);
- sbitmap_vector_zero (true_dependency_cache, luid);
- anti_dependency_cache = sbitmap_vector_alloc (luid, luid);
- sbitmap_vector_zero (anti_dependency_cache, luid);
- output_dependency_cache = sbitmap_vector_alloc (luid, luid);
- sbitmap_vector_zero (output_dependency_cache, luid);
+ cache_size = 0;
+ extend_dependency_caches (luid, true);
+ }
+
+ /* Lifetime of this obstack is whole function scheduling (not single region
+ scheduling) because some dependencies can be manually generated for
+ outside regions. See dont_calc_deps in sched-{rgn, ebb}.c .
+
+ Possible solution would be to have two obstacks:
+ * the big one for regular dependencies with region scheduling lifetime,
+ * and the small one for manually generated dependencies with function
+ scheduling lifetime. */
+ gcc_obstack_init (&deps_obstack);
+}
+
+/* Create or extend (depending on CREATE_P) dependency caches to
+ size N. */
+void
+extend_dependency_caches (int n, bool create_p)
+{
+ if (create_p || true_dependency_cache)
+ {
+ int i, luid = cache_size + n;
+
+ true_dependency_cache = XRESIZEVEC (bitmap_head, true_dependency_cache,
+ luid);
+ output_dependency_cache = XRESIZEVEC (bitmap_head,
+ output_dependency_cache, luid);
+ anti_dependency_cache = XRESIZEVEC (bitmap_head, anti_dependency_cache,
+ luid);
+#ifdef ENABLE_CHECKING
+ forward_dependency_cache = XRESIZEVEC (bitmap_head,
+ forward_dependency_cache, luid);
+#endif
+ if (current_sched_info->flags & DO_SPECULATION)
+ spec_dependency_cache = XRESIZEVEC (bitmap_head, spec_dependency_cache,
+ luid);
+
+ for (i = cache_size; i < luid; i++)
+ {
+ bitmap_initialize (&true_dependency_cache[i], 0);
+ bitmap_initialize (&output_dependency_cache[i], 0);
+ bitmap_initialize (&anti_dependency_cache[i], 0);
#ifdef ENABLE_CHECKING
- forward_dependency_cache = sbitmap_vector_alloc (luid, luid);
- sbitmap_vector_zero (forward_dependency_cache, luid);
+ bitmap_initialize (&forward_dependency_cache[i], 0);
#endif
+ if (current_sched_info->flags & DO_SPECULATION)
+ bitmap_initialize (&spec_dependency_cache[i], 0);
+ }
+ cache_size = luid;
}
}
/* Free the caches allocated in init_dependency_caches. */
void
-free_dependency_caches ()
+free_dependency_caches (void)
{
+ obstack_free (&deps_obstack, NULL);
+
if (true_dependency_cache)
{
+ int i;
+
+ for (i = 0; i < cache_size; i++)
+ {
+ bitmap_clear (&true_dependency_cache[i]);
+ bitmap_clear (&output_dependency_cache[i]);
+ bitmap_clear (&anti_dependency_cache[i]);
+#ifdef ENABLE_CHECKING
+ bitmap_clear (&forward_dependency_cache[i]);
+#endif
+ if (current_sched_info->flags & DO_SPECULATION)
+ bitmap_clear (&spec_dependency_cache[i]);
+ }
free (true_dependency_cache);
true_dependency_cache = NULL;
- free (anti_dependency_cache);
- anti_dependency_cache = NULL;
free (output_dependency_cache);
output_dependency_cache = NULL;
+ free (anti_dependency_cache);
+ anti_dependency_cache = NULL;
#ifdef ENABLE_CHECKING
free (forward_dependency_cache);
forward_dependency_cache = NULL;
#endif
+ if (current_sched_info->flags & DO_SPECULATION)
+ {
+ free (spec_dependency_cache);
+ spec_dependency_cache = NULL;
+ }
}
}
code. */
void
-init_deps_global ()
+init_deps_global (void)
{
- reg_pending_sets = INITIALIZE_REG_SET (reg_pending_sets_head);
- reg_pending_clobbers = INITIALIZE_REG_SET (reg_pending_clobbers_head);
- reg_pending_sets_all = 0;
+ reg_pending_sets = ALLOC_REG_SET (®_obstack);
+ reg_pending_clobbers = ALLOC_REG_SET (®_obstack);
+ reg_pending_uses = ALLOC_REG_SET (®_obstack);
+ reg_pending_barrier = NOT_A_BARRIER;
}
/* Free everything used by the dependency analysis code. */
void
-finish_deps_global ()
+finish_deps_global (void)
{
FREE_REG_SET (reg_pending_sets);
FREE_REG_SET (reg_pending_clobbers);
+ FREE_REG_SET (reg_pending_uses);
+}
+
+/* Insert LINK into the dependence chain pointed to by LINKP and
+ maintain the sort order. */
+static void
+adjust_add_sorted_back_dep (rtx insn, dep_link_t link, dep_link_t *linkp)
+{
+ gcc_assert (current_sched_info->flags & DO_SPECULATION);
+
+ /* If the insn cannot move speculatively, but the link is speculative,
+ make it hard dependence. */
+ if (HAS_INTERNAL_DEP (insn)
+ && (DEP_LINK_STATUS (link) & SPECULATIVE))
+ {
+ DEP_LINK_STATUS (link) &= ~SPECULATIVE;
+
+ if (true_dependency_cache)
+ bitmap_clear_bit (&spec_dependency_cache[INSN_LUID (insn)],
+ INSN_LUID (DEP_LINK_PRO (link)));
+ }
+
+ /* Non-speculative links go at the head of deps_list, followed by
+ speculative links. */
+ if (DEP_LINK_STATUS (link) & SPECULATIVE)
+ while (*linkp && !(DEP_LINK_STATUS (*linkp) & SPECULATIVE))
+ linkp = &DEP_LINK_NEXT (*linkp);
+
+ attach_dep_link (link, linkp);
+
+ if (CHECK)
+ gcc_assert (deps_list_consistent_p (INSN_BACK_DEPS (insn)));
+}
+
+/* Move the dependence pointed to by LINKP to the back dependencies
+ of INSN, and also add this dependence to the forward ones. All dep_links,
+ except one pointed to by LINKP, must be sorted. */
+static void
+adjust_back_add_forw_dep (rtx insn, dep_link_t *linkp)
+{
+ dep_link_t link;
+
+ gcc_assert (current_sched_info->flags & DO_SPECULATION);
+
+ link = *linkp;
+ detach_dep_link (link);
+
+ adjust_add_sorted_back_dep (insn, link,
+ &DEPS_LIST_FIRST (INSN_BACK_DEPS (insn)));
+ add_forw_dep (link);
+}
+
+/* Remove forward dependence described by L. */
+static void
+delete_forw_dep (dep_link_t l)
+{
+ gcc_assert (current_sched_info->flags & DO_SPECULATION);
+
+#ifdef ENABLE_CHECKING
+ if (true_dependency_cache)
+ bitmap_clear_bit (&forward_dependency_cache[INSN_LUID (DEP_LINK_PRO (l))],
+ INSN_LUID (DEP_LINK_CON (l)));
+#endif
+
+ detach_dep_link (l);
+
+ INSN_DEP_COUNT (DEP_LINK_CON (l))--;
+}
+
+/* Estimate the weakness of dependence between MEM1 and MEM2. */
+static dw_t
+estimate_dep_weak (rtx mem1, rtx mem2)
+{
+ rtx r1, r2;
+
+ if (mem1 == mem2)
+ /* MEMs are the same - don't speculate. */
+ return MIN_DEP_WEAK;
+
+ r1 = XEXP (mem1, 0);
+ r2 = XEXP (mem2, 0);
+
+ if (r1 == r2
+ || (REG_P (r1) && REG_P (r2)
+ && REGNO (r1) == REGNO (r2)))
+ /* Again, MEMs are the same. */
+ return MIN_DEP_WEAK;
+ else if ((REG_P (r1) && !REG_P (r2))
+ || (!REG_P (r1) && REG_P (r2)))
+ /* Different addressing modes - reason to be more speculative,
+ than usual. */
+ return NO_DEP_WEAK - (NO_DEP_WEAK - UNCERTAIN_DEP_WEAK) / 2;
+ else
+ /* We can't say anything about the dependence. */
+ return UNCERTAIN_DEP_WEAK;
+}
+
+/* Add or update backward dependence between INSN and ELEM with type DEP_TYPE.
+ This function can handle same INSN and ELEM (INSN == ELEM).
+ It is a convenience wrapper. */
+void
+add_dependence (rtx insn, rtx elem, enum reg_note dep_type)
+{
+ ds_t ds;
+
+ if (dep_type == REG_DEP_TRUE)
+ ds = DEP_TRUE;
+ else if (dep_type == REG_DEP_OUTPUT)
+ ds = DEP_OUTPUT;
+ else if (dep_type == REG_DEP_ANTI)
+ ds = DEP_ANTI;
+ else
+ gcc_unreachable ();
+
+ maybe_add_or_update_back_dep_1 (insn, elem, dep_type, ds, 0, 0, 0);
+}
+
+/* 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
+add_or_update_back_dep (rtx insn, rtx elem, enum reg_note dep_type, ds_t ds)
+{
+ return add_or_update_back_dep_1 (insn, elem, dep_type, ds, 0, 0, 0);
+}
+
+/* Add or update both backward and forward dependencies between INSN and ELEM
+ with given type DEP_TYPE and dep_status DS. */
+void
+add_or_update_back_forw_dep (rtx insn, rtx elem, enum reg_note dep_type,
+ ds_t ds)
+{
+ enum DEPS_ADJUST_RESULT res;
+ dep_link_t *linkp;
+
+ res = add_or_update_back_dep_1 (insn, elem, dep_type, ds, 0, 0, &linkp);
+
+ if (res == DEP_CHANGED || res == DEP_CREATED)
+ {
+ if (res == DEP_CHANGED)
+ delete_forw_dep (DEP_NODE_FORW (DEP_LINK_NODE (*linkp)));
+ else if (res == DEP_CREATED)
+ linkp = &DEPS_LIST_FIRST (INSN_BACK_DEPS (insn));
+
+ adjust_back_add_forw_dep (insn, linkp);
+ }
}
+
+/* Add both backward and forward dependencies between INSN and ELEM
+ with given type DEP_TYPE and dep_status DS. */
+void
+add_back_forw_dep (rtx insn, rtx elem, enum reg_note dep_type, ds_t ds)
+{
+ add_back_dep (insn, elem, dep_type, ds);
+ adjust_back_add_forw_dep (insn, &DEPS_LIST_FIRST (INSN_BACK_DEPS (insn)));
+
+ if (CHECK)
+ gcc_assert (deps_list_consistent_p (INSN_BACK_DEPS (insn)));
+}
+
+/* Remove a dependency referred to by L. */
+void
+delete_back_forw_dep (dep_link_t l)
+{
+ dep_node_t n = DEP_LINK_NODE (l);
+
+ gcc_assert (current_sched_info->flags & DO_SPECULATION);
+
+ if (true_dependency_cache != NULL)
+ {
+ dep_t dep = DEP_NODE_DEP (n);
+ int elem_luid = INSN_LUID (DEP_PRO (dep));
+ int insn_luid = INSN_LUID (DEP_CON (dep));
+
+ bitmap_clear_bit (&true_dependency_cache[insn_luid], elem_luid);
+ bitmap_clear_bit (&anti_dependency_cache[insn_luid], elem_luid);
+ bitmap_clear_bit (&output_dependency_cache[insn_luid], elem_luid);
+ bitmap_clear_bit (&spec_dependency_cache[insn_luid], elem_luid);
+ }
+
+ delete_forw_dep (DEP_NODE_FORW (n));
+ detach_dep_link (DEP_NODE_BACK (n));
+}
+
+/* Return weakness of speculative type TYPE in the dep_status DS. */
+dw_t
+get_dep_weak (ds_t ds, ds_t type)
+{
+ ds = ds & type;
+ switch (type)
+ {
+ case BEGIN_DATA: ds >>= BEGIN_DATA_BITS_OFFSET; break;
+ case BE_IN_DATA: ds >>= BE_IN_DATA_BITS_OFFSET; break;
+ case BEGIN_CONTROL: ds >>= BEGIN_CONTROL_BITS_OFFSET; break;
+ case BE_IN_CONTROL: ds >>= BE_IN_CONTROL_BITS_OFFSET; break;
+ default: gcc_unreachable ();
+ }
+
+ gcc_assert (MIN_DEP_WEAK <= ds && ds <= MAX_DEP_WEAK);
+ return (dw_t) ds;
+}
+
+/* Return the dep_status, which has the same parameters as DS, except for
+ speculative type TYPE, that will have weakness DW. */
+ds_t
+set_dep_weak (ds_t ds, ds_t type, dw_t dw)
+{
+ gcc_assert (MIN_DEP_WEAK <= dw && dw <= MAX_DEP_WEAK);
+
+ ds &= ~type;
+ switch (type)
+ {
+ case BEGIN_DATA: ds |= ((ds_t) dw) << BEGIN_DATA_BITS_OFFSET; break;
+ case BE_IN_DATA: ds |= ((ds_t) dw) << BE_IN_DATA_BITS_OFFSET; break;
+ case BEGIN_CONTROL: ds |= ((ds_t) dw) << BEGIN_CONTROL_BITS_OFFSET; break;
+ case BE_IN_CONTROL: ds |= ((ds_t) dw) << BE_IN_CONTROL_BITS_OFFSET; break;
+ default: gcc_unreachable ();
+ }
+ return ds;
+}
+
+/* Return the join of two dep_statuses DS1 and DS2. */
+ds_t
+ds_merge (ds_t ds1, ds_t ds2)
+{
+ ds_t ds, t;
+
+ gcc_assert ((ds1 & SPECULATIVE) && (ds2 & SPECULATIVE));
+
+ ds = (ds1 & DEP_TYPES) | (ds2 & DEP_TYPES);
+
+ t = FIRST_SPEC_TYPE;
+ do
+ {
+ if ((ds1 & t) && !(ds2 & t))
+ ds |= ds1 & t;
+ else if (!(ds1 & t) && (ds2 & t))
+ ds |= ds2 & t;
+ else if ((ds1 & t) && (ds2 & t))
+ {
+ ds_t dw;
+
+ dw = ((ds_t) get_dep_weak (ds1, t)) * ((ds_t) get_dep_weak (ds2, t));
+ dw /= MAX_DEP_WEAK;
+ if (dw < MIN_DEP_WEAK)
+ dw = MIN_DEP_WEAK;
+
+ ds = set_dep_weak (ds, t, (dw_t) dw);
+ }
+
+ if (t == LAST_SPEC_TYPE)
+ break;
+ t <<= SPEC_TYPE_SHIFT;
+ }
+ while (1);
+
+ return ds;
+}
+
+#ifdef INSN_SCHEDULING
+#ifdef ENABLE_CHECKING
+/* Verify that dependence type and status are consistent.
+ If RELAXED_P is true, then skip dep_weakness checks. */
+static void
+check_dep_status (enum reg_note dt, ds_t ds, bool relaxed_p)
+{
+ /* Check that dependence type contains the same bits as the status. */
+ if (dt == REG_DEP_TRUE)
+ gcc_assert (ds & DEP_TRUE);
+ else if (dt == REG_DEP_OUTPUT)
+ gcc_assert ((ds & DEP_OUTPUT)
+ && !(ds & DEP_TRUE));
+ else
+ gcc_assert ((dt == REG_DEP_ANTI)
+ && (ds & DEP_ANTI)
+ && !(ds & (DEP_OUTPUT | DEP_TRUE)));
+
+ /* HARD_DEP can not appear in dep_status of a link. */
+ gcc_assert (!(ds & HARD_DEP));
+
+ /* Check that dependence status is set correctly when speculation is not
+ supported. */
+ if (!(current_sched_info->flags & DO_SPECULATION))
+ gcc_assert (!(ds & SPECULATIVE));
+ else if (ds & SPECULATIVE)
+ {
+ if (!relaxed_p)
+ {
+ ds_t type = FIRST_SPEC_TYPE;
+
+ /* Check that dependence weakness is in proper range. */
+ do
+ {
+ if (ds & type)
+ get_dep_weak (ds, type);
+
+ if (type == LAST_SPEC_TYPE)
+ break;
+ type <<= SPEC_TYPE_SHIFT;
+ }
+ while (1);
+ }
+
+ if (ds & BEGIN_SPEC)
+ {
+ /* Only true dependence can be data speculative. */
+ if (ds & BEGIN_DATA)
+ gcc_assert (ds & DEP_TRUE);
+
+ /* Control dependencies in the insn scheduler are represented by
+ anti-dependencies, therefore only anti dependence can be
+ control speculative. */
+ if (ds & BEGIN_CONTROL)
+ gcc_assert (ds & DEP_ANTI);
+ }
+ else
+ {
+ /* Subsequent speculations should resolve true dependencies. */
+ gcc_assert ((ds & DEP_TYPES) == DEP_TRUE);
+ }
+
+ /* Check that true and anti dependencies can't have other speculative
+ statuses. */
+ if (ds & DEP_TRUE)
+ gcc_assert (ds & (BEGIN_DATA | BE_IN_SPEC));
+ /* An output dependence can't be speculative at all. */
+ gcc_assert (!(ds & DEP_OUTPUT));
+ if (ds & DEP_ANTI)
+ gcc_assert (ds & BEGIN_CONTROL);
+ }
+}
+#endif
+#endif
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