/* Definitions for computing resource usage of specific insns.
- Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
-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. */
#include "config.h"
#include "system.h"
#include "resource.h"
#include "except.h"
#include "insn-attr.h"
+#include "params.h"
/* This structure is used to record liveness information at the targets or
fallthrough insns of branches. We will most likely need the information
static int *bb_ticks;
/* Marks registers possibly live at the current place being scanned by
- mark_target_live_regs. Used only by next two function. */
+ mark_target_live_regs. Also used by update_live_status. */
static HARD_REG_SET current_live_regs;
static HARD_REG_SET pending_dead_regs;
\f
static void update_live_status PARAMS ((rtx, rtx, void *));
-static int find_basic_block PARAMS ((rtx));
+static int find_basic_block PARAMS ((rtx, int));
static rtx next_insn_no_annul PARAMS ((rtx));
static rtx find_dead_or_set_registers PARAMS ((rtx, struct resources*,
rtx*, int, struct resources,
return;
if (GET_CODE (dest) == SUBREG)
- first_regno = REGNO (SUBREG_REG (dest)) + SUBREG_WORD (dest);
+ first_regno = subreg_regno (dest);
else
first_regno = REGNO (dest);
CLEAR_HARD_REG_BIT (pending_dead_regs, i);
}
}
-/* Find the number of the basic block that starts closest to INSN. Return -1
- if we couldn't find such a basic block. */
+
+/* Find the number of the basic block with correct live register
+ information that starts closest to INSN. Return -1 if we couldn't
+ find such a basic block or the beginning is more than
+ SEARCH_LIMIT instructions before INSN. Use SEARCH_LIMIT = -1 for
+ an unlimited search.
+
+ The delay slot filling code destroys the control-flow graph so,
+ instead of finding the basic block containing INSN, we search
+ backwards toward a BARRIER where the live register information is
+ correct. */
static int
-find_basic_block (insn)
+find_basic_block (insn, search_limit)
rtx insn;
+ int search_limit;
{
- int i;
+ basic_block bb;
/* Scan backwards to the previous BARRIER. Then see if we can find a
label that starts a basic block. Return the basic block number. */
-
for (insn = prev_nonnote_insn (insn);
- insn && GET_CODE (insn) != BARRIER;
- insn = prev_nonnote_insn (insn))
+ insn && GET_CODE (insn) != BARRIER && search_limit != 0;
+ insn = prev_nonnote_insn (insn), --search_limit)
;
- /* The start of the function is basic block zero. */
- if (insn == 0)
- return 0;
+ /* The closest BARRIER is too far away. */
+ if (search_limit == 0)
+ return -1;
+
+ /* The start of the function. */
+ else if (insn == 0)
+ return ENTRY_BLOCK_PTR->next_bb->index;
/* See if any of the upcoming CODE_LABELs start a basic block. If we reach
anything other than a CODE_LABEL or note, we can't find this code. */
insn && GET_CODE (insn) == CODE_LABEL;
insn = next_nonnote_insn (insn))
{
- for (i = 0; i < n_basic_blocks; i++)
- if (insn == BLOCK_HEAD (i))
- return i;
+ FOR_EACH_BB (bb)
+ if (insn == bb->head)
+ return bb->index;
}
return -1;
{
/* If INSN is an annulled branch, skip any insns from the target
of the branch. */
- if (INSN_ANNULLED_BRANCH_P (insn)
+ if ((GET_CODE (insn) == JUMP_INSN
+ || GET_CODE (insn) == CALL_INSN
+ || GET_CODE (insn) == INSN)
+ && INSN_ANNULLED_BRANCH_P (insn)
&& NEXT_INSN (PREV_INSN (insn)) != insn)
- while (INSN_FROM_TARGET_P (NEXT_INSN (insn)))
- insn = NEXT_INSN (insn);
+ {
+ rtx next = NEXT_INSN (insn);
+ enum rtx_code code = GET_CODE (next);
+
+ while ((code == INSN || code == JUMP_INSN || code == CALL_INSN)
+ && INSN_FROM_TARGET_P (next))
+ {
+ insn = next;
+ next = NEXT_INSN (insn);
+ code = GET_CODE (next);
+ }
+ }
insn = NEXT_INSN (insn);
if (insn && GET_CODE (insn) == INSN
}
\f
/* Given X, some rtl, and RES, a pointer to a `struct resource', mark
- which resources are references by the insn. If INCLUDE_DELAYED_EFFECTS
+ which resources are referenced by the insn. If INCLUDE_DELAYED_EFFECTS
is TRUE, resources used by the called routine will be included for
CALL_INSNs. */
void
mark_referenced_resources (x, res, include_delayed_effects)
- register rtx x;
- register struct resources *res;
- register int include_delayed_effects;
+ rtx x;
+ struct resources *res;
+ int include_delayed_effects;
{
enum rtx_code code = GET_CODE (x);
int i, j;
unsigned int r;
- register const char *format_ptr;
+ const char *format_ptr;
/* Handle leaf items for which we set resource flags. Also, special-case
CALL, SET and CLOBBER operators. */
case CONST:
case CONST_INT:
case CONST_DOUBLE:
+ case CONST_VECTOR:
case PC:
case SYMBOL_REF:
case LABEL_REF:
mark_referenced_resources (SUBREG_REG (x), res, 0);
else
{
- unsigned int regno = REGNO (SUBREG_REG (x)) + SUBREG_WORD (x);
+ unsigned int regno = subreg_regno (x);
unsigned int last_regno
= regno + HARD_REGNO_NREGS (regno, GET_MODE (x));
+ if (last_regno > FIRST_PSEUDO_REGISTER)
+ abort ();
for (r = regno; r < last_regno; r++)
SET_HARD_REG_BIT (res->regs, r);
}
return;
case REG:
- for (r = 0; r < HARD_REGNO_NREGS (REGNO (x), GET_MODE (x)); r++)
- SET_HARD_REG_BIT (res->regs, REGNO (x) + r);
+ {
+ unsigned int regno = REGNO (x);
+ unsigned int last_regno
+ = regno + HARD_REGNO_NREGS (regno, GET_MODE (x));
+
+ if (last_regno > FIRST_PSEUDO_REGISTER)
+ abort ();
+ for (r = regno; r < last_regno; r++)
+ SET_HARD_REG_BIT (res->regs, r);
+ }
return;
case MEM:
We can not just fall through here since then we would be confused
by the ASM_INPUT rtx inside ASM_OPERANDS, which do not indicate
traditional asms unlike their normal usage. */
-
+
for (i = 0; i < ASM_OPERANDS_INPUT_LENGTH (x); i++)
mark_referenced_resources (ASM_OPERANDS_INPUT (x, i), res, 0);
return;
rtx insn = PREV_INSN (x);
rtx sequence = 0;
int seq_size = 0;
- rtx next = NEXT_INSN (x);
int i;
/* If we are part of a delay slot sequence, point at the SEQUENCE. */
if (NEXT_INSN (insn) != x)
{
- next = NEXT_INSN (NEXT_INSN (insn));
sequence = PATTERN (NEXT_INSN (insn));
seq_size = XVECLEN (sequence, 0);
if (GET_CODE (sequence) != SEQUENCE)
if (global_regs[i])
SET_HARD_REG_BIT (res->regs, i);
- /* Check for a NOTE_INSN_SETJMP. If it exists, then we must
+ /* Check for a REG_SETJMP. If it exists, then we must
assume that this call can need any register.
This is done to be more conservative about how we handle setjmp.
registers ensures that a register will not be considered dead
just because it crosses a setjmp call. A register should be
considered dead only if the setjmp call returns non-zero. */
- if (next && GET_CODE (next) == NOTE
- && NOTE_LINE_NUMBER (next) == NOTE_INSN_SETJMP)
+ if (find_reg_note (x, REG_SETJMP, NULL))
SET_HARD_REG_SET (res->regs);
{
}
\f
/* A subroutine of mark_target_live_regs. Search forward from TARGET
- looking for registers that are set before they are used. These are dead.
+ looking for registers that are set before they are used. These are dead.
Stop after passing a few conditional jumps, and/or a small
number of unconditional branches. */
know where we might end up next. That means that we have to
assume that whatever we have already marked as live really is
live. */
- if (can_throw (insn))
+ if (can_throw_internal (insn))
break;
switch (GET_CODE (insn))
SETs CC0 even though this is not totally correct. The reason for this is
that we require a SET of CC0 to immediately precede the reference to CC0.
So if some other insn sets CC0 as a side-effect, we know it cannot affect
- our computation and thus may be placed in a delay slot. */
+ our computation and thus may be placed in a delay slot. */
void
mark_set_resources (x, res, in_dest, mark_type)
- register rtx x;
- register struct resources *res;
+ rtx x;
+ struct resources *res;
int in_dest;
enum mark_resource_type mark_type;
{
case USE:
case CONST_INT:
case CONST_DOUBLE:
+ case CONST_VECTOR:
case LABEL_REF:
case SYMBOL_REF:
case CONST:
if (mark_type == MARK_SRC_DEST_CALL)
{
- rtx next = NEXT_INSN (x);
- rtx prev = PREV_INSN (x);
rtx link;
res->cc = res->memory = 1;
if (call_used_regs[r] || global_regs[r])
SET_HARD_REG_BIT (res->regs, r);
- /* If X is part of a delay slot sequence, then NEXT should be
- the first insn after the sequence. */
- if (NEXT_INSN (prev) != x)
- next = NEXT_INSN (NEXT_INSN (prev));
-
for (link = CALL_INSN_FUNCTION_USAGE (x);
link; link = XEXP (link, 1))
if (GET_CODE (XEXP (link, 0)) == CLOBBER)
mark_set_resources (SET_DEST (XEXP (link, 0)), res, 1,
MARK_SRC_DEST);
- /* Check for a NOTE_INSN_SETJMP. If it exists, then we must
+ /* Check for a REG_SETJMP. If it exists, then we must
assume that this call can clobber any register. */
- if (next && GET_CODE (next) == NOTE
- && NOTE_LINE_NUMBER (next) == NOTE_INSN_SETJMP)
+ if (find_reg_note (x, REG_SETJMP, NULL))
SET_HARD_REG_SET (res->regs);
}
case CLOBBER:
mark_set_resources (XEXP (x, 0), res, 1, MARK_SRC_DEST);
return;
-
+
case SEQUENCE:
for (i = 0; i < XVECLEN (x, 0); i++)
if (! (INSN_ANNULLED_BRANCH_P (XVECEXP (x, 0, 0))
case PRE_MODIFY:
case POST_MODIFY:
- mark_set_resources (XEXP (x, 0), res, 1, 0);
- mark_set_resources (XEXP (XEXP (x, 1), 0), res, 0, 0);
- mark_set_resources (XEXP (XEXP (x, 1), 1), res, 0, 0);
+ mark_set_resources (XEXP (x, 0), res, 1, MARK_SRC_DEST);
+ mark_set_resources (XEXP (XEXP (x, 1), 0), res, 0, MARK_SRC_DEST);
+ mark_set_resources (XEXP (XEXP (x, 1), 1), res, 0, MARK_SRC_DEST);
return;
case SIGN_EXTRACT:
mark_set_resources (SUBREG_REG (x), res, in_dest, mark_type);
else
{
- unsigned int regno = REGNO (SUBREG_REG (x)) + SUBREG_WORD (x);
+ unsigned int regno = subreg_regno (x);
unsigned int last_regno
= regno + HARD_REGNO_NREGS (regno, GET_MODE (x));
+ if (last_regno > FIRST_PSEUDO_REGISTER)
+ abort ();
for (r = regno; r < last_regno; r++)
SET_HARD_REG_BIT (res->regs, r);
}
case REG:
if (in_dest)
- for (r = 0; r < HARD_REGNO_NREGS (REGNO (x), GET_MODE (x)); r++)
- SET_HARD_REG_BIT (res->regs, REGNO (x) + r);
+ {
+ unsigned int regno = REGNO (x);
+ unsigned int last_regno
+ = regno + HARD_REGNO_NREGS (regno, GET_MODE (x));
+
+ if (last_regno > FIRST_PSEUDO_REGISTER)
+ abort ();
+ for (r = regno; r < last_regno; r++)
+ SET_HARD_REG_BIT (res->regs, r);
+ }
return;
case STRICT_LOW_PART:
We can not just fall through here since then we would be confused
by the ASM_INPUT rtx inside ASM_OPERANDS, which do not indicate
traditional asms unlike their normal usage. */
-
+
for (i = 0; i < ASM_OPERANDS_INPUT_LENGTH (x); i++)
mark_set_resources (ASM_OPERANDS_INPUT (x, i), res, in_dest,
MARK_SRC_DEST);
struct resources *res;
{
int b = -1;
- int i;
+ unsigned int i;
struct target_info *tinfo = NULL;
rtx insn;
rtx jump_insn = 0;
}
if (b == -1)
- b = find_basic_block (target);
+ b = find_basic_block (target, MAX_DELAY_SLOT_LIVE_SEARCH);
if (target_hash_table != NULL)
{
}
else
{
- /* Allocate a place to put our results and chain it into the
+ /* Allocate a place to put our results and chain it into the
hash table. */
- tinfo = (struct target_info *) oballoc (sizeof (struct target_info));
+ tinfo = (struct target_info *) xmalloc (sizeof (struct target_info));
tinfo->uid = INSN_UID (target);
tinfo->block = b;
- tinfo->next = target_hash_table[INSN_UID (target) % TARGET_HASH_PRIME];
+ tinfo->next
+ = target_hash_table[INSN_UID (target) % TARGET_HASH_PRIME];
target_hash_table[INSN_UID (target) % TARGET_HASH_PRIME] = tinfo;
}
}
{
rtx link;
rtx real_insn = insn;
+ enum rtx_code code = GET_CODE (insn);
/* If this insn is from the target of a branch, it isn't going to
be used in the sequel. If it is used in both cases, this
test will not be true. */
- if (INSN_FROM_TARGET_P (insn))
+ if ((code == INSN || code == JUMP_INSN || code == CALL_INSN)
+ && INSN_FROM_TARGET_P (insn))
continue;
/* If this insn is a USE made by update_block, we care about the
underlying insn. */
- if (GET_CODE (insn) == INSN && GET_CODE (PATTERN (insn)) == USE
+ if (code == INSN && GET_CODE (PATTERN (insn)) == USE
&& INSN_P (XEXP (PATTERN (insn), 0)))
real_insn = XEXP (PATTERN (insn), 0);
/* CALL clobbers all call-used regs that aren't fixed except
sp, ap, and fp. Do this before setting the result of the
call live. */
- for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
- if (call_used_regs[i]
- && i != STACK_POINTER_REGNUM && i != FRAME_POINTER_REGNUM
- && i != ARG_POINTER_REGNUM
-#if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
- && i != HARD_FRAME_POINTER_REGNUM
-#endif
-#if ARG_POINTER_REGNUM != FRAME_POINTER_REGNUM
- && ! (i == ARG_POINTER_REGNUM && fixed_regs[i])
-#endif
-#if defined (PIC_OFFSET_TABLE_REGNUM) && !defined (PIC_OFFSET_TABLE_REG_CALL_CLOBBERED)
- && ! (i == PIC_OFFSET_TABLE_REGNUM && flag_pic)
-#endif
- )
- CLEAR_HARD_REG_BIT (current_live_regs, i);
+ AND_COMPL_HARD_REG_SET (current_live_regs,
+ regs_invalidated_by_call);
/* A CALL_INSN sets any global register live, since it may
have been modified by the call. */
&& GET_CODE (XEXP (link, 0)) == REG
&& REGNO (XEXP (link, 0)) < FIRST_PSEUDO_REGISTER)
{
- int first_regno = REGNO (XEXP (link, 0));
- int last_regno
+ unsigned int first_regno = REGNO (XEXP (link, 0));
+ unsigned int last_regno
= (first_regno
+ HARD_REGNO_NREGS (first_regno,
GET_MODE (XEXP (link, 0))));
-
+
for (i = first_regno; i < last_regno; i++)
SET_HARD_REG_BIT (pending_dead_regs, i);
}
&& GET_CODE (XEXP (link, 0)) == REG
&& REGNO (XEXP (link, 0)) < FIRST_PSEUDO_REGISTER)
{
- int first_regno = REGNO (XEXP (link, 0));
- int last_regno
+ unsigned int first_regno = REGNO (XEXP (link, 0));
+ unsigned int last_regno
= (first_regno
+ HARD_REGNO_NREGS (first_regno,
GET_MODE (XEXP (link, 0))));
-
+
for (i = first_regno; i < last_regno; i++)
CLEAR_HARD_REG_BIT (current_live_regs, i);
}
RTL chain when there are no epilogue insns. Certain resources
are implicitly required at that point. */
else if (GET_CODE (real_insn) == NOTE
- && NOTE_LINE_NUMBER (real_insn) == NOTE_INSN_EPILOGUE_BEG)
+ && NOTE_LINE_NUMBER (real_insn) == NOTE_INSN_EPILOGUE_BEG)
IOR_HARD_REG_SET (current_live_regs, start_of_epilogue_needs.regs);
}
/* If we hit an unconditional branch, we have another way of finding out
what is live: we can see what is live at the branch target and include
anything used but not set before the branch. We add the live
- resources found using the test below to those found until now. */
+ resources found using the test below to those found until now. */
if (jump_insn)
{
/* Allocate and initialize the tables used by mark_target_live_regs. */
target_hash_table = (struct target_info **)
xcalloc (TARGET_HASH_PRIME, sizeof (struct target_info *));
- bb_ticks = (int *) xcalloc (n_basic_blocks, sizeof (int));
+ bb_ticks = (int *) xcalloc (last_basic_block, sizeof (int));
}
\f
/* Free up the resources allcated to mark_target_live_regs (). This
{
if (target_hash_table != NULL)
{
+ int i;
+
+ for (i = 0; i < TARGET_HASH_PRIME; ++i)
+ {
+ struct target_info *ti = target_hash_table[i];
+
+ while (ti)
+ {
+ struct target_info *next = ti->next;
+ free (ti);
+ ti = next;
+ }
+ }
+
free (target_hash_table);
target_hash_table = NULL;
}
rtx insn;
{
struct target_info *tinfo;
-
+
if (target_hash_table != NULL)
{
for (tinfo = target_hash_table[INSN_UID (insn) % TARGET_HASH_PRIME];
incr_ticks_for_insn (insn)
rtx insn;
{
- int b = find_basic_block (insn);
+ int b = find_basic_block (insn, MAX_DELAY_SLOT_LIVE_SEARCH);
if (b != -1)
bb_ticks[b]++;
}
\f
/* Add TRIAL to the set of resources used at the end of the current
- function. */
+ function. */
void
mark_end_of_function_resources (trial, include_delayed_effects)
rtx trial;
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