/* Perform instruction reorganizations for delay slot filling.
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
- 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+ 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.
Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu).
Hacked by Michael Tiemann (tiemann@cygnus.com).
#include "system.h"
#include "coretypes.h"
#include "tm.h"
-#include "toplev.h"
+#include "diagnostic-core.h"
#include "rtl.h"
#include "tm_p.h"
#include "expr.h"
static int stop_search_p (rtx, int);
static int resource_conflicts_p (struct resources *, struct resources *);
-static int insn_references_resource_p (rtx, struct resources *, int);
-static int insn_sets_resource_p (rtx, struct resources *, int);
+static int insn_references_resource_p (rtx, struct resources *, bool);
+static int insn_sets_resource_p (rtx, struct resources *, bool);
static rtx find_end_label (void);
static rtx emit_delay_sequence (rtx, rtx, int);
static rtx add_to_delay_list (rtx, rtx);
static void make_return_insns (rtx);
#endif
\f
+/* A wrapper around next_active_insn which takes care to return ret_rtx
+ unchanged. */
+
+static rtx
+first_active_target_insn (rtx insn)
+{
+ if (ANY_RETURN_P (insn))
+ return insn;
+ return next_active_insn (insn);
+}
+\f
/* Return TRUE if this insn should stop the search for insn to fill delay
slots. LABELS_P indicates that labels should terminate the search.
In all cases, jumps terminate the search. */
static int
insn_references_resource_p (rtx insn, struct resources *res,
- int include_delayed_effects)
+ bool include_delayed_effects)
{
struct resources insn_res;
static int
insn_sets_resource_p (rtx insn, struct resources *res,
- int include_delayed_effects)
+ bool include_delayed_effects)
{
struct resources insn_sets;
/* The return we make may have delay slots too. */
rtx insn = gen_return ();
insn = emit_jump_insn (insn);
+ JUMP_LABEL (insn) = ret_rtx;
emit_barrier ();
if (num_delay_slots (insn) > 0)
obstack_ptr_grow (&unfilled_slots_obstack, insn);
|| GET_CODE (PATTERN (next_trial)) == RETURN))
{
rtx target_label = JUMP_LABEL (next_trial);
- if (target_label == 0)
+ if (ANY_RETURN_P (target_label))
target_label = find_end_label ();
if (target_label)
be INSNs, CALL_INSNs, or JUMP_INSNs. Only JUMP_INSNs have branch
direction information, and only if they are conditional jumps.
- If LABEL is zero, then there is no way to determine the branch
+ If LABEL is a return, then there is no way to determine the branch
direction. */
if (JUMP_P (insn)
&& (condjump_p (insn) || condjump_in_parallel_p (insn))
+ && !ANY_RETURN_P (label)
&& INSN_UID (insn) <= max_uid
- && label != 0
&& INSN_UID (label) <= max_uid)
flags
= (uid_to_ruid[INSN_UID (label)] > uid_to_ruid[INSN_UID (insn)])
int jump_count = 0;
rtx next;
- for (; insn; insn = next)
+ for (; insn && !ANY_RETURN_P (insn); insn = next)
{
if (NONJUMP_INSN_P (insn) && GET_CODE (PATTERN (insn)) == SEQUENCE)
insn = XVECEXP (PATTERN (insn), 0, 0);
/* Predict backward branches usually take, forward branches usually not. If
we don't know whether this is forward or backward, assume the branch
will be taken, since most are. */
- return (target_label == 0 || INSN_UID (jump_insn) > max_uid
+ return (ANY_RETURN_P (target_label) || INSN_UID (jump_insn) > max_uid
|| INSN_UID (target_label) > max_uid
|| (uid_to_ruid[INSN_UID (jump_insn)]
> uid_to_ruid[INSN_UID (target_label)]));
if (condjump_in_parallel_p (insn))
pat = XVECEXP (pat, 0, 0);
- if (GET_CODE (pat) == RETURN)
- return target == 0 ? const_true_rtx : 0;
+ if (ANY_RETURN_P (pat))
+ return pat == target ? const_true_rtx : 0;
- else if (GET_CODE (pat) != SET || SET_DEST (pat) != pc_rtx)
+ if (GET_CODE (pat) != SET || SET_DEST (pat) != pc_rtx)
return 0;
src = SET_SRC (pat);
return const_true_rtx;
else if (GET_CODE (src) == IF_THEN_ELSE
- && ((target == 0 && GET_CODE (XEXP (src, 1)) == RETURN)
- || (GET_CODE (XEXP (src, 1)) == LABEL_REF
- && XEXP (XEXP (src, 1), 0) == target))
+ && XEXP (XEXP (src, 1), 0) == target
&& XEXP (src, 2) == pc_rtx)
return XEXP (src, 0);
else if (GET_CODE (src) == IF_THEN_ELSE
- && ((target == 0 && GET_CODE (XEXP (src, 2)) == RETURN)
- || (GET_CODE (XEXP (src, 2)) == LABEL_REF
- && XEXP (XEXP (src, 2), 0) == target))
+ && XEXP (XEXP (src, 2), 0) == target
&& XEXP (src, 1) == pc_rtx)
{
enum rtx_code rev;
rtx trial = XEXP (temp, 0);
mark_set_resources (trial, &cc_set, 0, MARK_SRC_DEST_CALL);
- if (insn_references_resource_p (XVECEXP (seq , 0, 0), &cc_set, 0))
+ if (insn_references_resource_p (XVECEXP (seq , 0, 0), &cc_set, false))
return delay_list;
}
rtx trial = XVECEXP (seq, 0, i);
int flags;
- if (insn_references_resource_p (trial, sets, 0)
- || insn_sets_resource_p (trial, needed, 0)
- || insn_sets_resource_p (trial, sets, 0)
+ if (insn_references_resource_p (trial, sets, false)
+ || insn_sets_resource_p (trial, needed, false)
+ || insn_sets_resource_p (trial, sets, false)
#ifdef HAVE_cc0
/* If TRIAL sets CC0, we can't copy it, so we can't steal this
delay list. */
if (! must_annul
&& ((condition == const_true_rtx
- || (! insn_sets_resource_p (trial, other_needed, 0)
+ || (! insn_sets_resource_p (trial, other_needed, false)
&& ! may_trap_or_fault_p (PATTERN (trial)))))
? eligible_for_delay (insn, total_slots_filled, trial, flags)
: (must_annul || (delay_list == NULL && new_delay_list == NULL))
}
/* Show the place to which we will be branching. */
- *pnew_thread = next_active_insn (JUMP_LABEL (XVECEXP (seq, 0, 0)));
+ *pnew_thread = first_active_target_insn (JUMP_LABEL (XVECEXP (seq, 0, 0)));
/* Add any new insns to the delay list and update the count of the
number of slots filled. */
/* If TRIAL sets CC0, stealing it will move it too far from the use
of CC0. */
- if (insn_references_resource_p (trial, sets, 0)
- || insn_sets_resource_p (trial, needed, 0)
- || insn_sets_resource_p (trial, sets, 0)
+ if (insn_references_resource_p (trial, sets, false)
+ || insn_sets_resource_p (trial, needed, false)
+ || insn_sets_resource_p (trial, sets, false)
#ifdef HAVE_cc0
|| sets_cc0_p (PATTERN (trial))
#endif
if (! must_annul
&& ((condition == const_true_rtx
- || (! insn_sets_resource_p (trial, other_needed, 0)
+ || (! insn_sets_resource_p (trial, other_needed, false)
&& ! may_trap_or_fault_p (PATTERN (trial)))))
? eligible_for_delay (insn, *pslots_filled, trial, flags)
: (must_annul || delay_list == NULL) && (must_annul = 1,
if (! annul_p)
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,
+ true);
for (trial = thread; !stop_search_p (trial, 1); trial = next_trial)
{
/* We can't share an insn that sets cc0. */
&& ! sets_cc0_p (pat)
#endif
- && ! insn_references_resource_p (trial, &set, 1)
- && ! insn_sets_resource_p (trial, &set, 1)
- && ! insn_sets_resource_p (trial, &needed, 1)
+ && ! insn_references_resource_p (trial, &set, true)
+ && ! insn_sets_resource_p (trial, &set, true)
+ && ! insn_sets_resource_p (trial, &needed, true)
&& (trial = try_split (pat, trial, 0)) != 0
/* Update next_trial, in case try_split succeeded. */
&& (next_trial = next_nonnote_insn (trial))
}
mark_set_resources (trial, &set, 0, MARK_SRC_DEST_CALL);
- mark_referenced_resources (trial, &needed, 1);
+ mark_referenced_resources (trial, &needed, true);
}
/* See if we stopped on a filled insn. If we did, try to see if its
/* Account for resources set/needed by the filled insn. */
mark_set_resources (filled_insn, &set, 0, MARK_SRC_DEST_CALL);
- mark_referenced_resources (filled_insn, &needed, 1);
+ mark_referenced_resources (filled_insn, &needed, true);
for (i = 1; i < XVECLEN (pat, 0); i++)
{
rtx dtrial = XVECEXP (pat, 0, i);
- if (! insn_references_resource_p (dtrial, &set, 1)
- && ! insn_sets_resource_p (dtrial, &set, 1)
- && ! insn_sets_resource_p (dtrial, &needed, 1)
+ if (! insn_references_resource_p (dtrial, &set, true)
+ && ! insn_sets_resource_p (dtrial, &set, true)
+ && ! insn_sets_resource_p (dtrial, &needed, true)
#ifdef HAVE_cc0
&& ! sets_cc0_p (PATTERN (dtrial))
#endif
/* 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_referenced_resources (dtrial, &needed, true);
}
}
}
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)
+ trial = PREV_INSN (trial))
{
if (LABEL_P (trial))
return 0;
- if (! INSN_P (trial))
+ if (!NONDEBUG_INSN_P (trial))
continue;
+ --insns_to_search;
pat = PATTERN (trial);
if (GET_CODE (pat) == USE || GET_CODE (pat) == CLOBBER)
CLEAR_RESOURCE (&needed);
CLEAR_RESOURCE (&set);
mark_set_resources (insn, &set, 0, MARK_SRC_DEST_CALL);
- mark_referenced_resources (insn, &needed, 1);
+ mark_referenced_resources (insn, &needed, true);
/* If TARGET is a SEQUENCE, get the main insn. */
if (NONJUMP_INSN_P (target) && GET_CODE (PATTERN (target)) == SEQUENCE)
#endif
/* The insn requiring the delay may not set anything needed or set by
INSN. */
- || insn_sets_resource_p (target_main, &needed, 1)
- || insn_sets_resource_p (target_main, &set, 1))
+ || insn_sets_resource_p (target_main, &needed, true)
+ || insn_sets_resource_p (target_main, &set, true))
return 0;
/* Insns we pass may not set either NEEDED or SET, so merge them for
while (delay_list)
{
- if (insn_sets_resource_p (XEXP (delay_list, 0), &needed, 1))
+ if (insn_sets_resource_p (XEXP (delay_list, 0), &needed, true))
return 0;
delay_list = XEXP (delay_list, 1);
}
if (NONJUMP_INSN_P (target) && GET_CODE (PATTERN (target)) == SEQUENCE)
for (i = 1; i < XVECLEN (PATTERN (target), 0); i++)
- if (insn_sets_resource_p (XVECEXP (PATTERN (target), 0, i), &needed, 1))
+ if (insn_sets_resource_p (XVECEXP (PATTERN (target), 0, i), &needed,
+ true))
return 0;
/* Scan backwards until we reach a label or an insn that uses something
for (trial = PREV_INSN (target),
insns_to_search = MAX_DELAY_SLOT_INSN_SEARCH;
trial && !LABEL_P (trial) && insns_to_search > 0;
- trial = PREV_INSN (trial), --insns_to_search)
+ trial = PREV_INSN (trial))
{
- if (!INSN_P (trial))
+ if (!NONDEBUG_INSN_P (trial))
continue;
+ --insns_to_search;
pat = PATTERN (trial);
if (GET_CODE (pat) == USE || GET_CODE (pat) == CLOBBER)
we must stop if it sets anything needed or set by INSN. */
if ((! INSN_ANNULLED_BRANCH_P (XVECEXP (pat, 0, 0))
|| ! INSN_FROM_TARGET_P (candidate))
- && insn_sets_resource_p (candidate, &needed, 1))
+ && insn_sets_resource_p (candidate, &needed, true))
return 0;
}
/* If the insn requiring the delay slot conflicts with INSN, we
must stop. */
- if (insn_sets_resource_p (XVECEXP (pat, 0, 0), &needed, 1))
+ if (insn_sets_resource_p (XVECEXP (pat, 0, 0), &needed, true))
return 0;
}
else
return trial;
/* Can't go any further if TRIAL conflicts with INSN. */
- if (insn_sets_resource_p (trial, &needed, 1))
+ if (insn_sets_resource_p (trial, &needed, true))
return 0;
}
}
rtx insn;
/* We don't own the function end. */
- if (thread == 0)
+ if (thread == 0 || ANY_RETURN_P (thread))
return 0;
/* Get the first active insn, or THREAD, if it is an active insn. */
CLEAR_RESOURCE (&needed);
CLEAR_RESOURCE (&set);
mark_set_resources (insn, &set, 0, MARK_SRC_DEST);
- mark_referenced_resources (insn, &needed, 0);
+ mark_referenced_resources (insn, &needed, false);
for (trial = prev_nonnote_insn (insn); ! stop_search_p (trial, 1);
trial = next_trial)
/* This must be an INSN or CALL_INSN. */
pat = PATTERN (trial);
- /* USE and CLOBBER at this level was just for flow; ignore it. */
+ /* Stand-alone USE and CLOBBER are just for flow. */
if (GET_CODE (pat) == USE || GET_CODE (pat) == CLOBBER)
continue;
/* Check for resource conflict first, to avoid unnecessary
splitting. */
- if (! insn_references_resource_p (trial, &set, 1)
- && ! insn_sets_resource_p (trial, &set, 1)
- && ! insn_sets_resource_p (trial, &needed, 1)
+ if (! insn_references_resource_p (trial, &set, true)
+ && ! insn_sets_resource_p (trial, &set, true)
+ && ! insn_sets_resource_p (trial, &needed, true)
#ifdef HAVE_cc0
/* Can't separate set of cc0 from its use. */
&& ! (reg_mentioned_p (cc0_rtx, pat) && ! sets_cc0_p (pat))
}
mark_set_resources (trial, &set, 0, MARK_SRC_DEST_CALL);
- mark_referenced_resources (trial, &needed, 1);
+ mark_referenced_resources (trial, &needed, true);
}
}
&& (!JUMP_P (insn)
|| ((condjump_p (insn) || condjump_in_parallel_p (insn))
&& ! simplejump_p (insn)
- && JUMP_LABEL (insn) != 0)))
+ && !ANY_RETURN_P (JUMP_LABEL (insn)))))
{
/* Invariant: If insn is a JUMP_INSN, the insn's jump
label. Otherwise, zero. */
if (CALL_P (insn))
{
mark_set_resources (insn, &set, 0, MARK_SRC_DEST_CALL);
- mark_referenced_resources (insn, &needed, 1);
+ mark_referenced_resources (insn, &needed, true);
maybe_never = 1;
}
else
{
mark_set_resources (insn, &set, 0, MARK_SRC_DEST_CALL);
- mark_referenced_resources (insn, &needed, 1);
+ mark_referenced_resources (insn, &needed, true);
if (JUMP_P (insn))
target = JUMP_LABEL (insn);
}
- if (target == 0)
- for (trial = next_nonnote_insn (insn); trial; trial = next_trial)
+ if (target == 0 || ANY_RETURN_P (target))
+ for (trial = next_nonnote_insn (insn); !stop_search_p (trial, 1);
+ trial = next_trial)
{
next_trial = next_nonnote_insn (trial);
- if (LABEL_P (trial)
- || BARRIER_P (trial))
- break;
-
- /* We must have an INSN, JUMP_INSN, or CALL_INSN. */
+ /* This must be an INSN or CALL_INSN. */
pat = PATTERN (trial);
/* Stand-alone USE and CLOBBER are just for flow. */
else
trial_delay = trial;
- /* Stop our search when seeing an unconditional jump. */
+ /* Stop our search when seeing a jump. */
if (JUMP_P (trial_delay))
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)
+ && ! insn_references_resource_p (trial, &set, true)
+ && ! insn_sets_resource_p (trial, &set, true)
+ && ! insn_sets_resource_p (trial, &needed, true)
#ifdef HAVE_cc0
&& ! (reg_mentioned_p (cc0_rtx, pat) && ! sets_cc0_p (pat))
#endif
}
mark_set_resources (trial, &set, 0, MARK_SRC_DEST_CALL);
- mark_referenced_resources (trial, &needed, 1);
+ mark_referenced_resources (trial, &needed, true);
/* Ensure we don't put insns between the setting of cc and the
comparison by moving a setting of cc into an earlier delay
Don't do this if the insn at the branch target is a branch. */
if (slots_to_fill != slots_filled
&& trial
- && JUMP_P (trial)
+ && jump_to_label_p (trial)
&& simplejump_p (trial)
&& (target == 0 || JUMP_LABEL (trial) == target)
&& (next_trial = next_active_insn (JUMP_LABEL (trial))) != 0
&& ! (NONJUMP_INSN_P (next_trial)
&& GET_CODE (PATTERN (next_trial)) == SEQUENCE)
&& !JUMP_P (next_trial)
- && ! insn_references_resource_p (next_trial, &set, 1)
- && ! insn_sets_resource_p (next_trial, &set, 1)
- && ! insn_sets_resource_p (next_trial, &needed, 1)
+ && ! insn_references_resource_p (next_trial, &set, true)
+ && ! insn_sets_resource_p (next_trial, &set, true)
+ && ! insn_sets_resource_p (next_trial, &needed, true)
#ifdef HAVE_cc0
&& ! reg_mentioned_p (cc0_rtx, PATTERN (next_trial))
#endif
if (GET_CODE (pat) == USE || GET_CODE (pat) == CLOBBER)
continue;
- if (! insn_references_resource_p (trial, &set, 1)
- && ! insn_sets_resource_p (trial, &needed, 1)
- && ! insn_sets_resource_p (trial, &set, 1)
+ if (! insn_references_resource_p (trial, &set, true)
+ && ! insn_sets_resource_p (trial, &needed, true)
+ && ! insn_sets_resource_p (trial, &set, true)
#ifdef HAVE_cc0
/* Don't want to mess with cc0 here. */
&& ! reg_mentioned_p (cc0_rtx, pat)
crtl->epilogue_delay_list
= gen_rtx_INSN_LIST (VOIDmode, trial,
crtl->epilogue_delay_list);
- mark_end_of_function_resources (trial, 1);
+ mark_end_of_function_resources (trial, true);
update_block (trial, trial);
delete_related_insns (trial);
}
mark_set_resources (trial, &set, 0, MARK_SRC_DEST_CALL);
- mark_referenced_resources (trial, &needed, 1);
+ mark_referenced_resources (trial, &needed, true);
}
note_delay_statistics (slots_filled, 0);
\f
/* Follow any unconditional jump at LABEL;
return the ultimate label reached by any such chain of jumps.
- Return null if the chain ultimately leads to a return instruction.
+ Return ret_rtx if the chain ultimately leads to a return instruction.
If LABEL is not followed by a jump, return LABEL.
If the chain loops or we can't find end, return LABEL,
since that tells caller to avoid changing the insn. */
rtx value = label;
int depth;
+ if (ANY_RETURN_P (label))
+ return label;
for (depth = 0;
(depth < 10
&& (insn = next_active_insn (value)) != 0
&& JUMP_P (insn)
- && ((JUMP_LABEL (insn) != 0 && any_uncondjump_p (insn)
- && onlyjump_p (insn))
+ && JUMP_LABEL (insn) != NULL_RTX
+ && ((any_uncondjump_p (insn) && onlyjump_p (insn))
|| GET_CODE (PATTERN (insn)) == RETURN)
&& (next = NEXT_INSN (insn))
&& BARRIER_P (next));
depth++)
{
+ rtx this_label = JUMP_LABEL (insn);
rtx tem;
/* If we have found a cycle, make the insn jump to itself. */
- if (JUMP_LABEL (insn) == label)
+ if (this_label == label)
return label;
-
- tem = next_active_insn (JUMP_LABEL (insn));
- if (tem && (GET_CODE (PATTERN (tem)) == ADDR_VEC
- || GET_CODE (PATTERN (tem)) == ADDR_DIFF_VEC))
+ if (ANY_RETURN_P (this_label))
+ return this_label;
+ tem = next_active_insn (this_label);
+ if (tem
+ && (GET_CODE (PATTERN (tem)) == ADDR_VEC
+ || GET_CODE (PATTERN (tem)) == ADDR_DIFF_VEC))
break;
- value = JUMP_LABEL (insn);
+ value = this_label;
}
if (depth == 10)
return label;
/* If our thread is the end of subroutine, we can't get any delay
insns from that. */
- if (thread == 0)
+ if (thread == NULL_RTX || ANY_RETURN_P (thread))
return delay_list;
/* If this is an unconditional branch, nothing is needed at the
/* If TRIAL conflicts with the insns ahead of it, we lose. Also,
don't separate or copy insns that set and use CC0. */
- if (! insn_references_resource_p (trial, &set, 1)
- && ! insn_sets_resource_p (trial, &set, 1)
- && ! insn_sets_resource_p (trial, &needed, 1)
+ if (! insn_references_resource_p (trial, &set, true)
+ && ! insn_sets_resource_p (trial, &set, true)
+ && ! insn_sets_resource_p (trial, &needed, true)
#ifdef HAVE_cc0
&& ! (reg_mentioned_p (cc0_rtx, pat)
&& (! own_thread || ! sets_cc0_p (pat)))
go into an annulled delay slot. */
if (!must_annul
&& (condition == const_true_rtx
- || (! insn_sets_resource_p (trial, &opposite_needed, 1)
+ || (! insn_sets_resource_p (trial, &opposite_needed, true)
&& ! may_trap_or_fault_p (pat))))
{
old_trial = trial;
gcc_assert (REG_NOTE_KIND (note)
== REG_LABEL_OPERAND);
}
- if (JUMP_P (trial) && JUMP_LABEL (trial))
+ if (jump_to_label_p (trial))
LABEL_NUSES (JUMP_LABEL (trial))++;
delete_related_insns (trial);
gcc_assert (REG_NOTE_KIND (note)
== REG_LABEL_OPERAND);
}
- if (JUMP_P (trial) && JUMP_LABEL (trial))
+ if (jump_to_label_p (trial))
LABEL_NUSES (JUMP_LABEL (trial))--;
}
else
may be branching to a location that has a
redundant insn. Skip any if so. */
while (new_thread && ! own_thread
- && ! insn_sets_resource_p (new_thread, &set, 1)
- && ! insn_sets_resource_p (new_thread, &needed, 1)
+ && ! insn_sets_resource_p (new_thread, &set, true)
+ && ! insn_sets_resource_p (new_thread, &needed,
+ true)
&& ! insn_references_resource_p (new_thread,
- &set, 1)
+ &set, true)
&& (prior_insn
= redundant_insn (new_thread, insn,
delay_list)))
/* This insn can't go into a delay slot. */
lose = 1;
mark_set_resources (trial, &set, 0, MARK_SRC_DEST_CALL);
- mark_referenced_resources (trial, &needed, 1);
+ mark_referenced_resources (trial, &needed, true);
/* 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
depend on the destination register. If so, try to place the opposite
arithmetic insn after the jump insn and put the arithmetic insn in the
delay slot. If we can't do this, return. */
- if (delay_list == 0 && likely && new_thread
+ if (delay_list == 0 && likely
+ && new_thread && !ANY_RETURN_P (new_thread)
&& NONJUMP_INSN_P (new_thread)
&& GET_CODE (PATTERN (new_thread)) != ASM_INPUT
&& asm_noperands (PATTERN (new_thread)) < 0)
/* If this is a constant adjustment, use the same code with
the negated constant. Otherwise, reverse the sense of the
arithmetic. */
- if (GET_CODE (other) == CONST_INT)
+ if (CONST_INT_P (other))
new_arith = gen_rtx_fmt_ee (GET_CODE (src), GET_MODE (src), dest,
negate_rtx (GET_MODE (src), other));
else
delay_list))
new_thread = follow_jumps (JUMP_LABEL (new_thread));
- if (new_thread == 0)
+ if (ANY_RETURN_P (new_thread))
label = find_end_label ();
else if (LABEL_P (new_thread))
label = new_thread;
them. Then see whether the branch is likely true. We don't need
to do a lot of this for unconditional branches. */
- insn_at_target = next_active_insn (target_label);
+ insn_at_target = first_active_target_insn (target_label);
own_target = own_thread_p (target_label, target_label, 0);
if (condition == const_true_rtx)
from the thread that was filled. So we have to recompute
the next insn at the target. */
target_label = JUMP_LABEL (insn);
- insn_at_target = next_active_insn (target_label);
+ insn_at_target = first_active_target_insn (target_label);
delay_list
= fill_slots_from_thread (insn, condition, fallthrough_insn,
/* Delete INSN and recursively delete insns that compute values used only
by INSN. This uses the REG_DEAD notes computed during flow analysis.
- If we are running before flow.c, we need do nothing since flow.c will
- delete dead code. We also can't know if the registers being used are
- dead or not at this point.
- Otherwise, look at all our REG_DEAD notes. If a previous insn does
- nothing other than set a register that dies in this insn, we can delete
- that insn as well.
+ Look at all our REG_DEAD notes. If a previous insn does nothing other
+ than set a register that dies in this insn, we can delete that insn
+ as well.
On machines with CC0, if CC0 is used in this insn, we may be able to
delete the insn that set it. */
group of consecutive labels. */
if (JUMP_P (insn)
&& (condjump_p (insn) || condjump_in_parallel_p (insn))
- && (target_label = JUMP_LABEL (insn)) != 0)
+ && !ANY_RETURN_P (target_label = JUMP_LABEL (insn)))
{
target_label = skip_consecutive_labels (follow_jumps (target_label));
- if (target_label == 0)
+ if (ANY_RETURN_P (target_label))
target_label = find_end_label ();
if (target_label && next_active_insn (target_label) == next
invert_jump fails. */
++LABEL_NUSES (target_label);
- if (label)
+ if (!ANY_RETURN_P (label))
++LABEL_NUSES (label);
if (invert_jump (insn, label, 1))
next = insn;
}
- if (label)
+ if (!ANY_RETURN_P (label))
--LABEL_NUSES (label);
if (--LABEL_NUSES (target_label) == 0)
We do this by deleting the INSN containing the SEQUENCE, then
re-emitting the insns separately, and then deleting the RETURN.
This allows the count of the jump target to be properly
- decremented. */
+ decremented.
- /* Clear the from target bit, since these insns are no longer
+ Note that we need to change the INSN_UID of the re-emitted insns
+ since it is used to hash the insns for mark_target_live_regs and
+ the re-emitted insns will no longer be wrapped up in a SEQUENCE.
+
+ Clear the from target bit, since these insns are no longer
in delay slots. */
for (i = 0; i < XVECLEN (pat, 0); i++)
INSN_FROM_TARGET_P (XVECEXP (pat, 0, i)) = 0;
trial = PREV_INSN (insn);
delete_related_insns (insn);
gcc_assert (GET_CODE (pat) == SEQUENCE);
- after = trial;
- for (i = 0; i < XVECLEN (pat, 0); i++)
- {
- rtx this_insn = XVECEXP (pat, 0, i);
- add_insn_after (this_insn, after, NULL);
- after = this_insn;
- }
+ add_insn_after (delay_insn, trial, NULL);
+ after = delay_insn;
+ for (i = 1; i < XVECLEN (pat, 0); i++)
+ after = emit_copy_of_insn_after (XVECEXP (pat, 0, i), after);
delete_scheduled_jump (delay_insn);
continue;
}
target_label = JUMP_LABEL (delay_insn);
- if (target_label)
+ if (!ANY_RETURN_P (target_label))
{
/* If this jump goes to another unconditional jump, thread it, but
don't convert a jump into a RETURN here. */
trial = skip_consecutive_labels (follow_jumps (target_label));
- if (trial == 0)
+ if (ANY_RETURN_P (trial))
trial = find_end_label ();
if (trial && trial != target_label
}
/* If the first insn at TARGET_LABEL is redundant with a previous
- insn, redirect the jump to the following insn process again. */
- trial = next_active_insn (target_label);
+ insn, redirect the jump to the following insn and process again.
+ We use next_real_insn instead of next_active_insn so we
+ don't skip USE-markers, or we'll end up with incorrect
+ liveness info. */
+ trial = next_real_insn (target_label);
if (trial && GET_CODE (PATTERN (trial)) != SEQUENCE
&& redundant_insn (trial, insn, 0)
&& ! can_throw_internal (trial))
&& redundant_insn (XVECEXP (PATTERN (trial), 0, 1), insn, 0))
{
target_label = JUMP_LABEL (XVECEXP (PATTERN (trial), 0, 0));
- if (target_label == 0)
+ if (ANY_RETURN_P (target_label))
target_label = find_end_label ();
if (target_label
We do this by deleting the INSN containing the SEQUENCE, then
re-emitting the insns separately, and then deleting the jump.
This allows the count of the jump target to be properly
- decremented. */
+ decremented.
+
+ Note that we need to change the INSN_UID of the re-emitted insns
+ since it is used to hash the insns for mark_target_live_regs and
+ the re-emitted insns will no longer be wrapped up in a SEQUENCE.
- /* Clear the from target bit, since these insns are no longer
+ Clear the from target bit, since these insns are no longer
in delay slots. */
for (i = 0; i < XVECLEN (pat, 0); i++)
INSN_FROM_TARGET_P (XVECEXP (pat, 0, i)) = 0;
trial = PREV_INSN (insn);
delete_related_insns (insn);
gcc_assert (GET_CODE (pat) == SEQUENCE);
- after = trial;
- for (i = 0; i < XVECLEN (pat, 0); i++)
- {
- rtx this_insn = XVECEXP (pat, 0, i);
- add_insn_after (this_insn, after, NULL);
- after = this_insn;
- }
+ add_insn_after (delay_insn, trial, NULL);
+ after = delay_insn;
+ for (i = 1; i < XVECLEN (pat, 0); i++)
+ after = emit_copy_of_insn_after (XVECEXP (pat, 0, i), after);
delete_scheduled_jump (delay_insn);
continue;
}
rtx label = JUMP_LABEL (next);
rtx old_label = JUMP_LABEL (delay_insn);
- if (label == 0)
+ if (ANY_RETURN_P (label))
label = find_end_label ();
/* find_end_label can generate a new label. Check this first. */
/* If we can't make the jump into a RETURN, try to redirect it to the best
RETURN and go on to the next insn. */
- if (! reorg_redirect_jump (jump_insn, NULL_RTX))
+ if (! reorg_redirect_jump (jump_insn, ret_rtx))
{
/* Make sure redirecting the jump will not invalidate the delay
slot insns. */
INSN_FROM_TARGET_P (insn) = 0;
/* Skip vector tables. We can't get attributes for them. */
- if (JUMP_P (insn)
- && (GET_CODE (PATTERN (insn)) == ADDR_VEC
- || GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC))
+ if (JUMP_TABLE_DATA_P (insn))
continue;
if (num_delay_slots (insn) > 0)
/* Ensure all jumps go to the last of a set of consecutive labels. */
if (JUMP_P (insn)
&& (condjump_p (insn) || condjump_in_parallel_p (insn))
- && JUMP_LABEL (insn) != 0
+ && !ANY_RETURN_P (JUMP_LABEL (insn))
&& ((target = skip_consecutive_labels (JUMP_LABEL (insn)))
!= JUMP_LABEL (insn)))
redirect_jump (insn, target, 1);
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- TODO_dump_func |
TODO_ggc_collect /* todo_flags_finish */
}
};
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- TODO_dump_func |
TODO_ggc_collect /* todo_flags_finish */
}
};
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