/* Perform instruction reorganizations for delay slot filling.
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu).
Hacked by Michael Tiemann (tiemann@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 FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+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 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, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA. */
/* Instruction reorganization pass.
is taken.
The HP-PA always has a branch delay slot. For unconditional branches
- its effects can be annulled when the branch is taken. The effects
+ its effects can be annulled when the branch is taken. The effects
of the delay slot in a conditional branch can be nullified for forward
taken branches, or for untaken backward branches. This means
we can hoist insns from the fall-through path for forward branches or
based on the condition code of the previous insn.
The HP-PA can conditionally nullify insns, providing a similar
- effect to the ARM, differing mostly in which insn is "in charge". */
+ effect to the ARM, differing mostly in which insn is "in charge". */
#include "config.h"
#include "system.h"
#include "hard-reg-set.h"
#include "basic-block.h"
#include "regs.h"
-#include "insn-flags.h"
#include "recog.h"
#include "flags.h"
#include "output.h"
#include "obstack.h"
#include "insn-attr.h"
#include "resource.h"
-
+#include "except.h"
+#include "params.h"
#ifdef DELAY_SLOTS
static int
insn_references_resource_p (insn, res, include_delayed_effects)
- register rtx insn;
- register struct resources *res;
+ rtx insn;
+ struct resources *res;
int include_delayed_effects;
{
struct resources insn_res;
static int
insn_sets_resource_p (insn, res, include_delayed_effects)
- register rtx insn;
- register struct resources *res;
+ rtx insn;
+ struct resources *res;
int include_delayed_effects;
{
struct resources insn_sets;
|| GET_CODE (PATTERN (insn)) == CLOBBER)))
insn = PREV_INSN (insn);
- /* When a target threads its epilogue we might already have a
+ /* When a target threads its epilogue we might already have a
suitable return insn. If so put a label before it for the
end_of_function_label. */
if (GET_CODE (insn) == BARRIER
{
insn = PREV_INSN (insn);
- /* Put the label before an USE insns that may proceed the
+ /* Put the label before an USE insns that may proceed the
RETURN insn. */
- while (GET_CODE (insn) == USE)
+ while (GET_CODE (insn) == USE)
insn = PREV_INSN (insn);
- emit_label_after (end_of_function_label, insn);
+ emit_label_after (end_of_function_label, insn);
}
else
{
- /* Otherwise, make a new label and emit a RETURN and BARRIER,
+ /* Otherwise, make a new label and emit a RETURN and BARRIER,
if needed. */
- emit_label (end_of_function_label);
+ emit_label (end_of_function_label);
#ifdef HAVE_return
- if (HAVE_return)
+ if (HAVE_return)
{
/* The return we make may have delay slots too. */
rtx insn = gen_return ();
insn = emit_jump_insn (insn);
emit_barrier ();
- if (num_delay_slots (insn) > 0)
- obstack_ptr_grow (&unfilled_slots_obstack, insn);
+ if (num_delay_slots (insn) > 0)
+ obstack_ptr_grow (&unfilled_slots_obstack, insn);
}
#endif
}
rtx list;
int length;
{
- register int i = 1;
- register rtx li;
+ int i = 1;
+ rtx li;
int had_barrier = 0;
/* Allocate the rtvec to hold the insns and the SEQUENCE. */
rtx delay_insn = copy_rtx (insn);
/* If INSN is followed by a BARRIER, delete the BARRIER since it will only
- confuse further processing. Update LAST in case it was the last insn.
+ confuse further processing. Update LAST in case it was the last insn.
We will put the BARRIER back in later. */
if (NEXT_INSN (insn) && GET_CODE (NEXT_INSN (insn)) == BARRIER)
{
- delete_insn (NEXT_INSN (insn));
+ delete_related_insns (NEXT_INSN (insn));
last = get_last_insn ();
had_barrier = 1;
}
for (li = list; li; li = XEXP (li, 1), i++)
{
rtx tem = XEXP (li, 0);
- rtx note;
+ rtx note, next;
/* Show that this copy of the insn isn't deleted. */
INSN_DELETED_P (tem) = 0;
PREV_INSN (tem) = XVECEXP (seq, 0, i - 1);
NEXT_INSN (XVECEXP (seq, 0, i - 1)) = tem;
- /* Remove any REG_DEAD notes because we can't rely on them now
- that the insn has been moved. */
- for (note = REG_NOTES (tem); note; note = XEXP (note, 1))
- if (REG_NOTE_KIND (note) == REG_DEAD)
- XEXP (note, 0) = const0_rtx;
+ for (note = REG_NOTES (tem); note; note = next)
+ {
+ next = XEXP (note, 1);
+ switch (REG_NOTE_KIND (note))
+ {
+ case REG_DEAD:
+ /* Remove any REG_DEAD notes because we can't rely on them now
+ that the insn has been moved. */
+ remove_note (tem, note);
+ break;
+
+ case REG_LABEL:
+ /* Keep the label reference count up to date. */
+ if (GET_CODE (XEXP (note, 0)) == CODE_LABEL)
+ LABEL_NUSES (XEXP (note, 0)) ++;
+ break;
+
+ default:
+ break;
+ }
+ }
}
NEXT_INSN (XVECEXP (seq, 0, length)) = NEXT_INSN (seq_insn);
if (NEXT_INSN (seq_insn) && GET_CODE (NEXT_INSN (seq_insn)) == INSN
&& GET_CODE (PATTERN (NEXT_INSN (seq_insn))) == SEQUENCE)
PREV_INSN (XVECEXP (PATTERN (NEXT_INSN (seq_insn)), 0, 0)) = seq_insn;
-
+
/* If there used to be a BARRIER, put it back. */
if (had_barrier)
emit_barrier_after (seq_insn);
XEXP (delay_list, 1) = add_to_delay_list (insn, XEXP (delay_list, 1));
return delay_list;
-}
+}
\f
/* Delete INSN from the delay slot of the insn that it is in, which may
produce an insn with no delay slots. Return the new insn. */
list, and rebuild the delay list if non-empty. */
prev = PREV_INSN (seq_insn);
trial = XVECEXP (seq, 0, 0);
- delete_insn (seq_insn);
+ delete_related_insns (seq_insn);
add_insn_after (trial, prev);
if (GET_CODE (trial) == JUMP_INSN
annul flag. */
if (delay_list)
trial = emit_delay_sequence (trial, delay_list, XVECLEN (seq, 0) - 2);
- else
+ else if (GET_CODE (trial) == JUMP_INSN
+ || GET_CODE (trial) == CALL_INSN
+ || GET_CODE (trial) == INSN)
INSN_ANNULLED_BRANCH_P (trial) = 0;
INSN_FROM_TARGET_P (insn) = 0;
if (GET_CODE (trial) == NOTE)
trial = prev_nonnote_insn (trial);
if (sets_cc0_p (PATTERN (trial)) != 1
- || FIND_REG_INC_NOTE (trial, 0))
+ || FIND_REG_INC_NOTE (trial, NULL_RTX))
return;
if (PREV_INSN (NEXT_INSN (trial)) == trial)
- delete_insn (trial);
+ delete_related_insns (trial);
else
delete_from_delay_slot (trial);
}
}
#endif
- delete_insn (insn);
+ delete_related_insns (insn);
}
\f
/* Counters for delay-slot filling. */
static rtx
optimize_skip (insn)
- register rtx insn;
+ rtx insn;
{
- register rtx trial = next_nonnote_insn (insn);
+ rtx trial = next_nonnote_insn (insn);
rtx next_trial = next_active_insn (trial);
rtx delay_list = 0;
rtx target_label;
|| GET_CODE (PATTERN (trial)) == SEQUENCE
|| recog_memoized (trial) < 0
|| (! eligible_for_annul_false (insn, 0, trial, flags)
- && ! eligible_for_annul_true (insn, 0, trial, flags)))
+ && ! eligible_for_annul_true (insn, 0, trial, flags))
+ || can_throw_internal (trial))
return 0;
/* There are two cases where we are just executing one insn (we assume
delay_list = add_to_delay_list (trial, NULL_RTX);
next_trial = next_active_insn (trial);
update_block (trial, trial);
- delete_insn (trial);
+ delete_related_insns (trial);
/* Also, if we are targeting an unconditional
branch, thread our jump to the target of that branch. Don't
}
#endif
\f
-
/* Encode and return branch direction and prediction information for
INSN assuming it will jump to LABEL.
&& INSN_UID (insn) <= max_uid
&& label != 0
&& INSN_UID (label) <= max_uid)
- flags
+ flags
= (uid_to_ruid[INSN_UID (label)] > uid_to_ruid[INSN_UID (insn)])
? ATTR_FLAG_forward : ATTR_FLAG_backward;
/* No valid direction information. */
else
flags = 0;
-
+
/* If insn is a conditional branch call mostly_true_jump to get
- determine the branch prediction.
+ determine the branch prediction.
Non conditional branches are predicted as very likely taken. */
if (GET_CODE (insn) == JUMP_INSN
prediction = mostly_true_jump (insn, get_branch_condition (insn, label));
switch (prediction)
{
- case 2:
- flags |= (ATTR_FLAG_very_likely | ATTR_FLAG_likely);
- break;
- case 1:
- flags |= ATTR_FLAG_likely;
- break;
- case 0:
- flags |= ATTR_FLAG_unlikely;
- break;
- case -1:
- flags |= (ATTR_FLAG_very_unlikely | ATTR_FLAG_unlikely);
- break;
+ case 2:
+ flags |= (ATTR_FLAG_very_likely | ATTR_FLAG_likely);
+ break;
+ case 1:
+ flags |= ATTR_FLAG_likely;
+ break;
+ case 0:
+ flags |= ATTR_FLAG_unlikely;
+ break;
+ case -1:
+ flags |= (ATTR_FLAG_very_unlikely | ATTR_FLAG_unlikely);
+ break;
- default:
- abort();
+ default:
+ abort ();
}
}
else
case CODE_LABEL:
return 0;
case BARRIER:
- /* A BARRIER can either be after a JUMP_INSN or a CALL_INSN. We
+ /* A BARRIER can either be after a JUMP_INSN or a CALL_INSN. We
don't scan past JUMP_INSNs, so any barrier we find here must
have been after a CALL_INSN and hence mean the call doesn't
return. */
int prob = INTVAL (XEXP (note, 0));
if (prob >= REG_BR_PROB_BASE * 9 / 10)
- return 2;
+ return 2;
else if (prob >= REG_BR_PROB_BASE / 2)
- return 1;
+ return 1;
else if (prob >= REG_BR_PROB_BASE / 10)
- return 0;
+ return 0;
else
- return -1;
+ return -1;
}
/* ??? Ought to use estimate_probability instead. */
{
/* If this is the test of a loop, it is very likely true. We scan
backwards from the target label. If we find a NOTE_INSN_LOOP_BEG
- before the next real insn, we assume the branch is to the top of
+ before the next real insn, we assume the branch is to the top of
the loop. */
for (insn = PREV_INSN (target_label);
insn && GET_CODE (insn) == NOTE;
return 2;
}
- /* If we couldn't figure out what this jump was, assume it won't be
+ /* If we couldn't figure out what this jump was, assume it won't be
taken. This should be rare. */
if (condition == 0)
return 0;
case LE:
case LT:
if (XEXP (condition, 1) == const0_rtx)
- return 0;
+ return 0;
break;
case GE:
case GT:
{
rtx pat = PATTERN (insn);
rtx src;
-
+
if (condjump_in_parallel_p (insn))
pat = XVECEXP (pat, 0, 0);
|| (GET_CODE (XEXP (src, 2)) == LABEL_REF
&& XEXP (XEXP (src, 2), 0) == target))
&& XEXP (src, 1) == pc_rtx)
- return gen_rtx_fmt_ee (reverse_condition (GET_CODE (XEXP (src, 0))),
- GET_MODE (XEXP (src, 0)),
- XEXP (XEXP (src, 0), 0), XEXP (XEXP (src, 0), 1));
+ {
+ enum rtx_code rev;
+ rev = reversed_comparison_code (XEXP (src, 0), insn);
+ if (rev != UNKNOWN)
+ return gen_rtx_fmt_ee (rev, GET_MODE (XEXP (src, 0)),
+ XEXP (XEXP (src, 0), 0),
+ XEXP (XEXP (src, 0), 1));
+ }
return 0;
}
? eligible_for_annul_true (jump, i - 1,
XVECEXP (pat, 0, i), flags) :
#endif
- eligible_for_delay (jump, i -1, XVECEXP (pat, 0, i), flags)))
+ eligible_for_delay (jump, i - 1, XVECEXP (pat, 0, i), flags)))
break;
return (i == XVECLEN (pat, 0));
if (delay_list)
{
for (temp = delay_list; temp; temp = XEXP (temp, 1))
- {
- rtx trial = XEXP (temp, 0);
-
- if ((annul_true_p && INSN_FROM_TARGET_P (trial))
+ {
+ rtx trial = XEXP (temp, 0);
+
+ if ((annul_true_p && INSN_FROM_TARGET_P (trial))
|| (!annul_true_p && !INSN_FROM_TARGET_P (trial)))
return 0;
- }
+ }
}
return 1;
}
-
\f
/* INSN branches to an insn whose pattern SEQ is a SEQUENCE. Given that
the condition tested by INSN is CONDITION and the resources shown in
moving the instructions in the delay slots.
We can not steal the delay list if one of the instructions in the
- current delay_list modifies the condition codes and the jump in the
+ current delay_list modifies the condition codes and the jump in the
sequence is a conditional jump. We can not do this because we can
not change the direction of the jump because the condition codes
- will effect the direction of the jump in the sequence. */
+ will effect the direction of the jump in the sequence. */
CLEAR_RESOURCE (&cc_set);
for (temp = delay_list; temp; temp = XEXP (temp, 1))
mark_set_resources (trial, &cc_set, 0, MARK_SRC_DEST_CALL);
if (insn_references_resource_p (XVECEXP (seq , 0, 0), &cc_set, 0))
- return delay_list;
+ return delay_list;
}
if (XVECLEN (seq, 0) - 1 > slots_remaining
|| ! single_set (XVECEXP (seq, 0, 0)))
return delay_list;
+#ifdef MD_CAN_REDIRECT_BRANCH
+ /* On some targets, branches with delay slots can have a limited
+ displacement. Give the back end a chance to tell us we can't do
+ this. */
+ if (! MD_CAN_REDIRECT_BRANCH (insn, XVECEXP (seq, 0, 0)))
+ return delay_list;
+#endif
+
for (i = 1; i < XVECLEN (seq, 0); i++)
{
rtx trial = XVECEXP (seq, 0, i);
return delay_list;
}
\f
-/* Similar to steal_delay_list_from_target except that SEQ is on the
+/* Similar to steal_delay_list_from_target except that SEQ is on the
fallthrough path of INSN. Here we only do something if the delay insn
of SEQ is an unconditional branch. In that case we steal its delay slot
for INSN since unconditional branches are much easier to fill. */
static rtx
-steal_delay_list_from_fallthrough (insn, condition, seq,
+steal_delay_list_from_fallthrough (insn, condition, seq,
delay_list, sets, needed, other_needed,
slots_to_fill, pslots_filled, pannul_p)
rtx insn, condition;
*pannul_p = 1;
return delay_list;
}
-
\f
/* Try merging insns starting at THREAD which match exactly the insns in
INSN's delay list.
will essentially disable this optimization. This method is somewhat of
a kludge, but I don't see a better way.) */
if (! annul_p)
- for (i = 1 ; i < num_slots ; i++)
+ for (i = 1 ; i < num_slots; i++)
if (XVECEXP (PATTERN (insn), 0, i))
- mark_referenced_resources (XVECEXP (PATTERN (insn), 0, i), &needed, 1);
+ mark_referenced_resources (XVECEXP (PATTERN (insn), 0, i), &needed, 1);
for (trial = thread; !stop_search_p (trial, 1); trial = next_trial)
{
if (trial == thread)
thread = next_active_insn (thread);
- delete_insn (trial);
+ delete_related_insns (trial);
INSN_FROM_TARGET_P (next_to_match) = 0;
}
else
{
/* Keep track of the set/referenced resources for the delay
slots of any trial insns we encounter. */
- mark_set_resources (dtrial, &set, 0, MARK_SRC_DEST_CALL);
- mark_referenced_resources (dtrial, &needed, 1);
+ mark_set_resources (dtrial, &set, 0, MARK_SRC_DEST_CALL);
+ mark_referenced_resources (dtrial, &needed, 1);
}
}
}
else
{
update_block (XEXP (merged_insns, 0), thread);
- delete_insn (XEXP (merged_insns, 0));
+ delete_related_insns (XEXP (merged_insns, 0));
}
}
rtx trial, pat;
struct resources needed, set;
int i;
+ unsigned insns_to_search;
/* If INSN has any REG_UNUSED notes, it can't match anything since we
are allowed to not actually assign to such a register. */
return 0;
/* Scan backwards looking for a match. */
- for (trial = PREV_INSN (target); trial; trial = PREV_INSN (trial))
+ for (trial = PREV_INSN (target),
+ insns_to_search = MAX_DELAY_SLOT_INSN_SEARCH;
+ trial && insns_to_search > 0;
+ trial = PREV_INSN (trial), --insns_to_search)
{
if (GET_CODE (trial) == CODE_LABEL)
return 0;
return 0;
/* Stop for an INSN or JUMP_INSN with delayed effects and its delay
- slots because it is difficult to track its resource needs
+ slots because it is difficult to track its resource needs
correctly. */
#ifdef INSN_SETS_ARE_DELAYED
if (INSN_SETS_ARE_DELAYED (XVECEXP (pat, 0, 0)))
- return 0;
+ return 0;
#endif
#ifdef INSN_REFERENCES_ARE_DELAYED
if (INSN_REFERENCES_ARE_DELAYED (XVECEXP (pat, 0, 0)))
- return 0;
+ return 0;
#endif
/* See if any of the insns in the delay slot match, updating
/* Scan backwards until we reach a label or an insn that uses something
INSN sets or sets something insn uses or sets. */
- for (trial = PREV_INSN (target);
- trial && GET_CODE (trial) != CODE_LABEL;
- trial = PREV_INSN (trial))
+ for (trial = PREV_INSN (target),
+ insns_to_search = MAX_DELAY_SLOT_INSN_SEARCH;
+ trial && GET_CODE (trial) != CODE_LABEL && insns_to_search > 0;
+ trial = PREV_INSN (trial), --insns_to_search)
{
if (GET_CODE (trial) != INSN && GET_CODE (trial) != CALL_INSN
&& GET_CODE (trial) != JUMP_INSN)
#ifdef INSN_SETS_ARE_DELAYED
if (INSN_SETS_ARE_DELAYED (XVECEXP (pat, 0, 0)))
- return 0;
+ return 0;
#endif
#ifdef INSN_REFERENCES_ARE_DELAYED
if (INSN_REFERENCES_ARE_DELAYED (XVECEXP (pat, 0, 0)))
- return 0;
+ return 0;
#endif
/* See if any of the insns in the delay slot match, updating
return 0;
}
-
- /* If the insn requiring the delay slot conflicts with INSN, we
+ /* If the insn requiring the delay slot conflicts with INSN, we
must stop. */
if (insn_sets_resource_p (XVECEXP (pat, 0, 0), &needed, 1))
return 0;
rtx insn;
rtx where;
{
- /* Ignore if this was in a delay slot and it came from the target of
+ /* Ignore if this was in a delay slot and it came from the target of
a branch. */
if (INSN_FROM_TARGET_P (insn))
return;
fill_simple_delay_slots (non_jumps_p)
int non_jumps_p;
{
- register rtx insn, pat, trial, next_trial;
- register int i;
+ rtx insn, pat, trial, next_trial;
+ int i;
int num_unfilled_slots = unfilled_slots_next - unfilled_slots_base;
struct resources needed, set;
int slots_to_fill, slots_filled;
|| (GET_CODE (insn) == JUMP_INSN && non_jumps_p)
|| (GET_CODE (insn) != JUMP_INSN && ! non_jumps_p))
continue;
-
+
/* It may have been that this insn used to need delay slots, but
now doesn't; ignore in that case. This can happen, for example,
on the HP PA RISC, where the number of delay slots depends on
insn must exist when it is subsequently scanned.
This is tried on each insn with delay slots as some machines
- have insns which perform calls, but are not represented as
+ have insns which perform calls, but are not represented as
CALL_INSNs. */
slots_filled = 0;
&& GET_CODE (trial) == JUMP_INSN
&& simplejump_p (trial)
&& eligible_for_delay (insn, slots_filled, trial, flags)
- && no_labels_between_p (insn, trial))
+ && no_labels_between_p (insn, trial)
+ && ! can_throw_internal (trial))
{
rtx *tmp;
slots_filled++;
tmp++;
/* Remove the unconditional jump from consideration for delay slot
- filling and unthread it. */
+ filling and unthread it. */
if (*tmp == trial)
*tmp = 0;
{
forward in execution sequence), it must not need or set any resources
that were set by later insns and must not set any resources that
are needed for those insns.
-
+
The delay slot insn itself sets resources unless it is a call
(in which case the called routine, not the insn itself, is doing
the setting). */
if (GET_CODE (pat) == USE || GET_CODE (pat) == CLOBBER)
continue;
- /* Check for resource conflict first, to avoid unnecessary
+ /* Check for resource conflict first, to avoid unnecessary
splitting. */
if (! insn_references_resource_p (trial, &set, 1)
&& ! insn_sets_resource_p (trial, &set, 1)
/* Can't separate set of cc0 from its use. */
&& ! (reg_mentioned_p (cc0_rtx, pat) && ! sets_cc0_p (pat))
#endif
- )
+ && ! can_throw_internal (trial))
{
trial = try_split (pat, trial, 1);
next_trial = prev_nonnote_insn (trial);
delay_list = gen_rtx_INSN_LIST (VOIDmode,
trial, delay_list);
update_block (trial, trial);
- delete_insn (trial);
+ delete_related_insns (trial);
if (slots_to_fill == ++slots_filled)
break;
continue;
#if defined(ANNUL_IFFALSE_SLOTS) || defined(ANNUL_IFTRUE_SLOTS)
if (slots_filled != slots_to_fill
&& delay_list == 0
- && GET_CODE (insn) == JUMP_INSN
+ && GET_CODE (insn) == JUMP_INSN
&& (condjump_p (insn) || condjump_in_parallel_p (insn)))
{
delay_list = optimize_skip (insn);
fill_eager_delay_slots anyways, it was just deleted. */
if (slots_filled != slots_to_fill
- && (GET_CODE (insn) != JUMP_INSN
+ /* If this instruction could throw an exception which is
+ caught in the same function, then it's not safe to fill
+ the delay slot with an instruction from beyond this
+ point. For example, consider:
+
+ int i = 2;
+
+ try {
+ f();
+ i = 3;
+ } catch (...) {}
+
+ return i;
+
+ Even though `i' is a local variable, we must be sure not
+ to put `i = 3' in the delay slot if `f' might throw an
+ exception.
+
+ Presumably, we should also check to see if we could get
+ back to this function via `setjmp'. */
+ && ! can_throw_internal (insn)
+ && (GET_CODE (insn) != JUMP_INSN
|| ((condjump_p (insn) || condjump_in_parallel_p (insn))
- && ! simplejump_p (insn)
- && JUMP_LABEL (insn) != 0)))
+ && ! simplejump_p (insn)
+ && JUMP_LABEL (insn) != 0)))
{
+ /* Invariant: If insn is a JUMP_INSN, the insn's jump
+ label. Otherwise, zero. */
rtx target = 0;
int maybe_never = 0;
- struct resources needed_at_jump;
+ rtx pat, trial_delay;
CLEAR_RESOURCE (&needed);
CLEAR_RESOURCE (&set);
mark_referenced_resources (insn, &needed, 1);
maybe_never = 1;
}
- else
+ else
{
mark_set_resources (insn, &set, 0, MARK_SRC_DEST_CALL);
mark_referenced_resources (insn, &needed, 1);
target = JUMP_LABEL (insn);
}
- for (trial = next_nonnote_insn (insn); trial; trial = next_trial)
- {
- rtx pat, trial_delay;
-
- next_trial = next_nonnote_insn (trial);
-
- if (GET_CODE (trial) == CODE_LABEL
- || GET_CODE (trial) == BARRIER)
- break;
+ if (target == 0)
+ for (trial = next_nonnote_insn (insn); trial; trial = next_trial)
+ {
+ next_trial = next_nonnote_insn (trial);
- /* We must have an INSN, JUMP_INSN, or CALL_INSN. */
- pat = PATTERN (trial);
+ if (GET_CODE (trial) == CODE_LABEL
+ || GET_CODE (trial) == BARRIER)
+ break;
- /* Stand-alone USE and CLOBBER are just for flow. */
- if (GET_CODE (pat) == USE || GET_CODE (pat) == CLOBBER)
- continue;
+ /* We must have an INSN, JUMP_INSN, or CALL_INSN. */
+ pat = PATTERN (trial);
- /* If this already has filled delay slots, get the insn needing
- the delay slots. */
- if (GET_CODE (pat) == SEQUENCE)
- trial_delay = XVECEXP (pat, 0, 0);
- else
- trial_delay = trial;
-
- /* If this is a jump insn to our target, indicate that we have
- seen another jump to it. If we aren't handling a conditional
- jump, stop our search. Otherwise, compute the needs at its
- target and add them to NEEDED. */
- if (GET_CODE (trial_delay) == JUMP_INSN)
- {
- if (target == 0)
- break;
- else if (JUMP_LABEL (trial_delay) != target)
- {
- rtx ninsn =
- next_active_insn (JUMP_LABEL (trial_delay));
-
- mark_target_live_regs (get_insns (), ninsn,
- &needed_at_jump);
- needed.memory |= needed_at_jump.memory;
- needed.unch_memory |= needed_at_jump.unch_memory;
- IOR_HARD_REG_SET (needed.regs, needed_at_jump.regs);
- }
- }
+ /* Stand-alone USE and CLOBBER are just for flow. */
+ if (GET_CODE (pat) == USE || GET_CODE (pat) == CLOBBER)
+ continue;
- /* See if we have a resource problem before we try to
- split. */
- if (target == 0
- && GET_CODE (pat) != SEQUENCE
- && ! insn_references_resource_p (trial, &set, 1)
- && ! insn_sets_resource_p (trial, &set, 1)
- && ! insn_sets_resource_p (trial, &needed, 1)
+ /* If this already has filled delay slots, get the insn needing
+ the delay slots. */
+ if (GET_CODE (pat) == SEQUENCE)
+ trial_delay = XVECEXP (pat, 0, 0);
+ else
+ trial_delay = trial;
+
+ /* Stop our search when seeing an unconditional jump. */
+ if (GET_CODE (trial_delay) == JUMP_INSN)
+ break;
+
+ /* See if we have a resource problem before we try to
+ split. */
+ if (GET_CODE (pat) != SEQUENCE
+ && ! insn_references_resource_p (trial, &set, 1)
+ && ! insn_sets_resource_p (trial, &set, 1)
+ && ! insn_sets_resource_p (trial, &needed, 1)
#ifdef HAVE_cc0
- && ! (reg_mentioned_p (cc0_rtx, pat) && ! sets_cc0_p (pat))
+ && ! (reg_mentioned_p (cc0_rtx, pat) && ! sets_cc0_p (pat))
#endif
- && ! (maybe_never && may_trap_p (pat))
- && (trial = try_split (pat, trial, 0))
- && eligible_for_delay (insn, slots_filled, trial, flags))
- {
- next_trial = next_nonnote_insn (trial);
- delay_list = add_to_delay_list (trial, delay_list);
+ && ! (maybe_never && may_trap_p (pat))
+ && (trial = try_split (pat, trial, 0))
+ && eligible_for_delay (insn, slots_filled, trial, flags)
+ && ! can_throw_internal(trial))
+ {
+ next_trial = next_nonnote_insn (trial);
+ delay_list = add_to_delay_list (trial, delay_list);
#ifdef HAVE_cc0
- if (reg_mentioned_p (cc0_rtx, pat))
- link_cc0_insns (trial);
+ if (reg_mentioned_p (cc0_rtx, pat))
+ link_cc0_insns (trial);
#endif
- delete_insn (trial);
- if (slots_to_fill == ++slots_filled)
- break;
- continue;
- }
+ delete_related_insns (trial);
+ if (slots_to_fill == ++slots_filled)
+ break;
+ continue;
+ }
- mark_set_resources (trial, &set, 0, MARK_SRC_DEST_CALL);
- mark_referenced_resources (trial, &needed, 1);
+ mark_set_resources (trial, &set, 0, MARK_SRC_DEST_CALL);
+ mark_referenced_resources (trial, &needed, 1);
- /* Ensure we don't put insns between the setting of cc and the
- comparison by moving a setting of cc into an earlier delay
- slot since these insns could clobber the condition code. */
- set.cc = 1;
+ /* Ensure we don't put insns between the setting of cc and the
+ comparison by moving a setting of cc into an earlier delay
+ slot since these insns could clobber the condition code. */
+ set.cc = 1;
- /* If this is a call or jump, we might not get here. */
- if (GET_CODE (trial_delay) == CALL_INSN
- || GET_CODE (trial_delay) == JUMP_INSN)
- maybe_never = 1;
- }
+ /* If this is a call or jump, we might not get here. */
+ if (GET_CODE (trial_delay) == CALL_INSN
+ || GET_CODE (trial_delay) == JUMP_INSN)
+ maybe_never = 1;
+ }
/* If there are slots left to fill and our search was stopped by an
unconditional branch, try the insn at the branch target. We can
- redirect the branch if it works.
+ redirect the branch if it works.
Don't do this if the insn at the branch target is a branch. */
if (slots_to_fill != slots_filled
#endif
&& ! (maybe_never && may_trap_p (PATTERN (next_trial)))
&& (next_trial = try_split (PATTERN (next_trial), next_trial, 0))
- && eligible_for_delay (insn, slots_filled, next_trial, flags))
+ && eligible_for_delay (insn, slots_filled, next_trial, flags)
+ && ! can_throw_internal (trial))
{
rtx new_label = next_active_insn (next_trial);
else
new_label = find_end_label ();
- delay_list
+ delay_list
= add_to_delay_list (copy_rtx (next_trial), delay_list);
slots_filled++;
reorg_redirect_jump (trial, new_label);
#ifdef DELAY_SLOTS_FOR_EPILOGUE
/* See if the epilogue needs any delay slots. Try to fill them if so.
- The only thing we can do is scan backwards from the end of the
+ The only thing we can do is scan backwards from the end of the
function. If we did this in a previous pass, it is incorrect to do it
again. */
if (current_function_epilogue_delay_list)
SET_HARD_REG_BIT (needed.regs, STACK_POINTER_REGNUM);
#ifdef EPILOGUE_USES
- for (i = 0; i <FIRST_PSEUDO_REGISTER; i++)
+ for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
{
if (EPILOGUE_USES (i))
SET_HARD_REG_BIT (needed.regs, i);
/* Don't want to mess with cc0 here. */
&& ! reg_mentioned_p (cc0_rtx, pat)
#endif
- )
+ && ! can_throw_internal (trial))
{
trial = try_split (pat, trial, 1);
if (ELIGIBLE_FOR_EPILOGUE_DELAY (trial, slots_filled))
current_function_epilogue_delay_list);
mark_end_of_function_resources (trial, 1);
update_block (trial, trial);
- delete_insn (trial);
+ delete_related_insns (trial);
/* Clear deleted bit so final.c will output the insn. */
INSN_DELETED_P (trial) = 0;
/* If our thread is the end of subroutine, we can't get any delay
insns from that. */
if (thread == 0)
- return delay_list;
+ return delay_list;
/* If this is an unconditional branch, nothing is needed at the
opposite thread. Otherwise, compute what is needed there. */
&& ! (reg_mentioned_p (cc0_rtx, pat)
&& (! own_thread || ! sets_cc0_p (pat)))
#endif
- )
+ && ! can_throw_internal (trial))
{
rtx prior_insn;
new_thread = thread;
}
- delete_insn (trial);
+ delete_related_insns (trial);
}
else
{
starting point of this thread. */
if (own_thread)
{
+ rtx note;
+
update_block (trial, thread);
if (trial == thread)
{
if (new_thread == trial)
new_thread = thread;
}
- delete_insn (trial);
+
+ /* We are moving this insn, not deleting it. We must
+ temporarily increment the use count on any referenced
+ label lest it be deleted by delete_related_insns. */
+ note = find_reg_note (trial, REG_LABEL, 0);
+ /* REG_LABEL could be NOTE_INSN_DELETED_LABEL too. */
+ if (note && GET_CODE (XEXP (note, 0)) == CODE_LABEL)
+ LABEL_NUSES (XEXP (note, 0))++;
+
+ delete_related_insns (trial);
+
+ if (note && GET_CODE (XEXP (note, 0)) == CODE_LABEL)
+ LABEL_NUSES (XEXP (note, 0))--;
}
else
new_thread = next_active_insn (trial);
/* If this is the `true' thread, we will want to follow the jump,
so we can only do this if we have taken everything up to here. */
if (thread_if_true && trial == new_thread)
- delay_list
- = steal_delay_list_from_target (insn, condition, PATTERN (trial),
- delay_list, &set, &needed,
- &opposite_needed, slots_to_fill,
- pslots_filled, &must_annul,
- &new_thread);
+ {
+ delay_list
+ = steal_delay_list_from_target (insn, condition, PATTERN (trial),
+ delay_list, &set, &needed,
+ &opposite_needed, slots_to_fill,
+ pslots_filled, &must_annul,
+ &new_thread);
+ /* If we owned the thread and are told that it branched
+ elsewhere, make sure we own the thread at the new location. */
+ if (own_thread && trial != new_thread)
+ own_thread = own_thread_p (new_thread, new_thread, 0);
+ }
else if (! thread_if_true)
delay_list
= steal_delay_list_from_fallthrough (insn, condition,
trial = new_thread;
pat = PATTERN (trial);
- if (GET_CODE (trial) != INSN || GET_CODE (pat) != SET
- || ! eligible_for_delay (insn, 0, trial, flags))
+ if (GET_CODE (trial) != INSN
+ || GET_CODE (pat) != SET
+ || ! eligible_for_delay (insn, 0, trial, flags)
+ || can_throw_internal (trial))
return 0;
dest = SET_DEST (pat), src = SET_SRC (pat);
if (recog_memoized (ninsn) < 0
|| (extract_insn (ninsn), ! constrain_operands (1)))
{
- delete_insn (ninsn);
+ delete_related_insns (ninsn);
return 0;
}
if (new_thread == trial)
new_thread = thread;
}
- delete_insn (trial);
+ delete_related_insns (trial);
}
else
new_thread = next_active_insn (trial);
static void
fill_eager_delay_slots ()
{
- register rtx insn;
- register int i;
+ rtx insn;
+ int i;
int num_unfilled_slots = unfilled_slots_next - unfilled_slots_base;
for (i = 0; i < num_unfilled_slots; i++)
}
/* If this insn is expected to branch, first try to get insns from our
- target, then our fallthrough insns. If it is not, expected to branch,
+ target, then our fallthrough insns. If it is not expected to branch,
try the other order. */
if (prediction > 0)
relax_delay_slots (first)
rtx first;
{
- register rtx insn, next, pat;
- register rtx trial, delay_insn, target_label;
+ rtx insn, next, pat;
+ rtx trial, delay_insn, target_label;
/* Look at every JUMP_INSN and see if we can improve it. */
for (insn = first; insn; insn = next)
if (target_label != JUMP_LABEL (insn))
reorg_redirect_jump (insn, target_label);
- /* See if this jump branches around a unconditional jump.
+ /* See if this jump branches around an unconditional jump.
If so, invert this jump and point it to the target of the
second jump. */
if (next && GET_CODE (next) == JUMP_INSN
if (invert_jump (insn, label, 1))
{
- delete_insn (next);
+ delete_related_insns (next);
next = insn;
}
--LABEL_NUSES (label);
if (--LABEL_NUSES (target_label) == 0)
- delete_insn (target_label);
+ delete_related_insns (target_label);
continue;
}
}
-
+
/* If this is an unconditional jump and the previous insn is a
conditional jump, try reversing the condition of the previous
insn and swapping our targets. The next pass might be able to
INSN_FROM_TARGET_P (XVECEXP (pat, 0, i)) = 0;
trial = PREV_INSN (insn);
- delete_insn (insn);
+ delete_related_insns (insn);
emit_insn_after (pat, trial);
delete_scheduled_jump (delay_insn);
continue;
if (trial == 0 && target_label != 0)
trial = find_end_label ();
- if (trial != target_label
+ if (trial != target_label
&& redirect_with_delay_slots_safe_p (delay_insn, trial, insn))
{
reorg_redirect_jump (delay_insn, trial);
insn, redirect the jump to the following insn process again. */
trial = next_active_insn (target_label);
if (trial && GET_CODE (PATTERN (trial)) != SEQUENCE
- && redundant_insn (trial, insn, 0))
+ && redundant_insn (trial, insn, 0)
+ && ! can_throw_internal (trial))
{
rtx tmp;
tmp = find_end_label ();
/* Insert the special USE insn and update dataflow info. */
- update_block (trial, tmp);
+ update_block (trial, tmp);
/* Now emit a label before the special USE insn, and
- redirect our jump to the new label. */
+ redirect our jump to the new label. */
target_label = get_label_before (PREV_INSN (tmp));
reorg_redirect_jump (delay_insn, target_label);
next = insn;
if (target_label == 0)
target_label = find_end_label ();
- if (redirect_with_delay_slots_safe_p (delay_insn, target_label,
+ if (redirect_with_delay_slots_safe_p (delay_insn, target_label,
insn))
{
reorg_redirect_jump (delay_insn, target_label);
INSN_FROM_TARGET_P (XVECEXP (pat, 0, i)) = 0;
trial = PREV_INSN (insn);
- delete_insn (insn);
+ delete_related_insns (insn);
emit_insn_after (pat, trial);
delete_scheduled_jump (delay_insn);
continue;
&& XVECLEN (pat, 0) == 2
&& rtx_equal_p (PATTERN (next), PATTERN (XVECEXP (pat, 0, 1))))
{
- delete_insn (insn);
+ delete_related_insns (insn);
continue;
}
INSN_FROM_TARGET_P (slot) = ! INSN_FROM_TARGET_P (slot);
}
- delete_insn (next);
+ delete_related_insns (next);
next = insn;
}
if (old_label && --LABEL_NUSES (old_label) == 0)
- delete_insn (old_label);
+ delete_related_insns (old_label);
continue;
}
}
real_return_label = get_label_before (insn);
break;
}
-
+
/* Show an extra usage of REAL_RETURN_LABEL so it won't go away if it
was equal to END_OF_FUNCTION_LABEL. */
LABEL_NUSES (real_return_label)++;
? eligible_for_annul_true (jump_insn, i - 1,
XVECEXP (pat, 0, i), flags) :
#endif
- eligible_for_delay (jump_insn, i -1, XVECEXP (pat, 0, i), flags)))
+ eligible_for_delay (jump_insn, i - 1,
+ XVECEXP (pat, 0, i), flags)))
break;
}
else
{
rtx prev = PREV_INSN (insn);
- delete_insn (insn);
+ delete_related_insns (insn);
for (i = 1; i < XVECLEN (pat, 0); i++)
prev = emit_insn_after (PATTERN (XVECEXP (pat, 0, i)), prev);
/* Now delete REAL_RETURN_LABEL if we never used it. Then try to fill any
new delay slots we have created. */
if (--LABEL_NUSES (real_return_label) == 0)
- delete_insn (real_return_label);
+ delete_related_insns (real_return_label);
fill_simple_delay_slots (1);
fill_simple_delay_slots (0);
flag_no_peephole = old_flag_no_peephole;
#endif
- /* If the current function has no insns other than the prologue and
+ /* If the current function has no insns other than the prologue and
epilogue, then do not try to fill any delay slots. */
if (n_basic_blocks == 0)
return;
uid_to_ruid = (int *) xmalloc ((max_uid + 1) * sizeof (int));
for (i = 0, insn = first; insn; i++, insn = NEXT_INSN (insn))
uid_to_ruid[INSN_UID (insn)] = i;
-
+
/* Initialize the list of insns that need filling. */
if (unfilled_firstobj == 0)
{
&& (GET_CODE (PATTERN (insn)) == ADDR_VEC
|| GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC))
continue;
-
+
if (num_delay_slots (insn) > 0)
obstack_ptr_grow (&unfilled_slots_obstack, insn);
/* Ensure all jumps go to the last of a set of consecutive labels. */
- if (GET_CODE (insn) == JUMP_INSN
+ if (GET_CODE (insn) == JUMP_INSN
&& (condjump_p (insn) || condjump_in_parallel_p (insn))
&& JUMP_LABEL (insn) != 0
&& ((target = prev_label (next_active_insn (JUMP_LABEL (insn))))
end_of_function_label = 0;
/* Initialize the statistics for this function. */
- bzero ((char *) num_insns_needing_delays, sizeof num_insns_needing_delays);
- bzero ((char *) num_filled_delays, sizeof num_filled_delays);
+ memset ((char *) num_insns_needing_delays, 0, sizeof num_insns_needing_delays);
+ memset ((char *) num_filled_delays, 0, sizeof num_filled_delays);
/* Now do the delay slot filling. Try everything twice in case earlier
changes make more slots fillable. */
if (GET_CODE (insn) == INSN && GET_CODE (PATTERN (insn)) == USE
&& INSN_P (XEXP (PATTERN (insn), 0)))
- next = delete_insn (insn);
+ next = delete_related_insns (insn);
}
/* If we made an end of function label, indicate that it is now
safe to delete it by undoing our prior adjustment to LABEL_NUSES.
If it is now unused, delete it. */
if (end_of_function_label && --LABEL_NUSES (end_of_function_label) == 0)
- delete_insn (end_of_function_label);
+ delete_related_insns (end_of_function_label);
#ifdef HAVE_return
if (HAVE_return && end_of_function_label != 0)
/* It is not clear why the line below is needed, but it does seem to be. */
unfilled_firstobj = (rtx *) obstack_alloc (&unfilled_slots_obstack, 0);
- /* Reposition the prologue and epilogue notes in case we moved the
- prologue/epilogue insns. */
- reposition_prologue_and_epilogue_notes (first);
-
if (file)
{
- register int i, j, need_comma;
+ int i, j, need_comma;
int total_delay_slots[MAX_DELAY_HISTOGRAM + 1];
int total_annul_slots[MAX_DELAY_HISTOGRAM + 1];
fprintf (file, "\n");
}
}
- bzero ((char *) total_delay_slots, sizeof total_delay_slots);
- bzero ((char *) total_annul_slots, sizeof total_annul_slots);
+ memset ((char *) total_delay_slots, 0, sizeof total_delay_slots);
+ memset ((char *) total_annul_slots, 0, sizeof total_annul_slots);
for (insn = first; insn; insn = NEXT_INSN (insn))
{
if (! INSN_DELETED_P (insn)
else
total_delay_slots[j]++;
}
- else if (num_delay_slots (insn) > 0)
+ else if (num_delay_slots (insn) > 0)
total_delay_slots[0]++;
}
}
int pred_flags;
if (GET_CODE (insn) == INSN)
- {
+ {
rtx pat = PATTERN (insn);
if (GET_CODE (pat) == SEQUENCE)
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