/* Definitions for computing resource usage of specific insns.
- Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
+ 2009 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-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. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "toplev.h"
#include "rtl.h"
#include "tm_p.h"
#include "hard-reg-set.h"
-#include "basic-block.h"
#include "function.h"
#include "regs.h"
#include "flags.h"
#include "except.h"
#include "insn-attr.h"
#include "params.h"
+#include "df.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 HARD_REG_SET pending_dead_regs;
\f
-static void update_live_status PARAMS ((rtx, rtx, void *));
-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,
- struct resources));
+static void update_live_status (rtx, const_rtx, void *);
+static int find_basic_block (rtx, int);
+static rtx next_insn_no_annul (rtx);
+static rtx find_dead_or_set_registers (rtx, struct resources*,
+ rtx*, int, struct resources,
+ struct resources);
\f
/* Utility function called from mark_target_live_regs via note_stores.
It deadens any CLOBBERed registers and livens any SET registers. */
static void
-update_live_status (dest, x, data)
- rtx dest;
- rtx x;
- void *data ATTRIBUTE_UNUSED;
+update_live_status (rtx dest, const_rtx x, void *data ATTRIBUTE_UNUSED)
{
int first_regno, last_regno;
int i;
- if (GET_CODE (dest) != REG
- && (GET_CODE (dest) != SUBREG || GET_CODE (SUBREG_REG (dest)) != REG))
+ if (!REG_P (dest)
+ && (GET_CODE (dest) != SUBREG || !REG_P (SUBREG_REG (dest))))
return;
if (GET_CODE (dest) == SUBREG)
- first_regno = subreg_regno (dest);
- else
- first_regno = REGNO (dest);
+ {
+ first_regno = subreg_regno (dest);
+ last_regno = first_regno + subreg_nregs (dest);
- last_regno = first_regno + HARD_REGNO_NREGS (first_regno, GET_MODE (dest));
+ }
+ else
+ {
+ first_regno = REGNO (dest);
+ last_regno = END_HARD_REGNO (dest);
+ }
if (GET_CODE (x) == CLOBBER)
for (i = first_regno; i < last_regno; i++)
correct. */
static int
-find_basic_block (insn, search_limit)
- rtx insn;
- int search_limit;
+find_basic_block (rtx insn, int search_limit)
{
- int i;
-
/* 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 && search_limit != 0;
+ insn && !BARRIER_P (insn) && search_limit != 0;
insn = prev_nonnote_insn (insn), --search_limit)
;
if (search_limit == 0)
return -1;
- /* The start of the function is basic block zero. */
+ /* The start of the function. */
else if (insn == 0)
- return 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. */
for (insn = next_nonnote_insn (insn);
- insn && GET_CODE (insn) == CODE_LABEL;
+ insn && LABEL_P (insn);
insn = next_nonnote_insn (insn))
- {
- for (i = 0; i < n_basic_blocks; i++)
- if (insn == BLOCK_HEAD (i))
- return i;
- }
+ if (BLOCK_FOR_INSN (insn))
+ return BLOCK_FOR_INSN (insn)->index;
return -1;
}
an annulled branch. */
static rtx
-next_insn_no_annul (insn)
- rtx insn;
+next_insn_no_annul (rtx insn)
{
if (insn)
{
/* If INSN is an annulled branch, skip any insns from the target
of the branch. */
- if (INSN_ANNULLED_BRANCH_P (insn)
+ if (INSN_P (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
+ if (insn && NONJUMP_INSN_P (insn)
&& GET_CODE (PATTERN (insn)) == SEQUENCE)
insn = XVECEXP (PATTERN (insn), 0, 0);
}
CALL_INSNs. */
void
-mark_referenced_resources (x, res, include_delayed_effects)
- rtx x;
- struct resources *res;
- int include_delayed_effects;
+mark_referenced_resources (rtx x, struct resources *res,
+ bool include_delayed_effects)
{
enum rtx_code code = GET_CODE (x);
int i, j;
case CONST:
case CONST_INT:
case CONST_DOUBLE:
+ case CONST_FIXED:
case CONST_VECTOR:
case PC:
case SYMBOL_REF:
return;
case SUBREG:
- if (GET_CODE (SUBREG_REG (x)) != REG)
- mark_referenced_resources (SUBREG_REG (x), res, 0);
+ if (!REG_P (SUBREG_REG (x)))
+ mark_referenced_resources (SUBREG_REG (x), res, false);
else
{
unsigned int regno = subreg_regno (x);
- unsigned int last_regno
- = regno + HARD_REGNO_NREGS (regno, GET_MODE (x));
+ unsigned int last_regno = regno + subreg_nregs (x);
- if (last_regno > FIRST_PSEUDO_REGISTER)
- abort ();
+ gcc_assert (last_regno <= FIRST_PSEUDO_REGISTER);
for (r = regno; r < last_regno; r++)
SET_HARD_REG_BIT (res->regs, r);
}
return;
case REG:
- {
- 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);
- }
+ gcc_assert (HARD_REGISTER_P (x));
+ add_to_hard_reg_set (&res->regs, GET_MODE (x), REGNO (x));
return;
case MEM:
/* If this memory shouldn't change, it really isn't referencing
memory. */
- if (RTX_UNCHANGING_P (x))
+ if (MEM_READONLY_P (x))
res->unch_memory = 1;
else
res->memory = 1;
res->volatil |= MEM_VOLATILE_P (x);
/* Mark registers used to access memory. */
- mark_referenced_resources (XEXP (x, 0), res, 0);
+ mark_referenced_resources (XEXP (x, 0), res, false);
return;
case CC0:
return;
case UNSPEC_VOLATILE:
+ case TRAP_IF:
case ASM_INPUT:
/* Traditional asm's are always volatile. */
res->volatil = 1;
- return;
-
- case TRAP_IF:
- res->volatil = 1;
break;
case ASM_OPERANDS:
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);
+ mark_referenced_resources (ASM_OPERANDS_INPUT (x, i), res, false);
return;
case CALL:
/* The first operand will be a (MEM (xxx)) but doesn't really reference
memory. The second operand may be referenced, though. */
- mark_referenced_resources (XEXP (XEXP (x, 0), 0), res, 0);
- mark_referenced_resources (XEXP (x, 1), res, 0);
+ mark_referenced_resources (XEXP (XEXP (x, 0), 0), res, false);
+ mark_referenced_resources (XEXP (x, 1), res, false);
return;
case SET:
/* Usually, the first operand of SET is set, not referenced. But
registers used to access memory are referenced. SET_DEST is
- also referenced if it is a ZERO_EXTRACT or SIGN_EXTRACT. */
+ also referenced if it is a ZERO_EXTRACT. */
- mark_referenced_resources (SET_SRC (x), res, 0);
+ mark_referenced_resources (SET_SRC (x), res, false);
x = SET_DEST (x);
- if (GET_CODE (x) == SIGN_EXTRACT
- || GET_CODE (x) == ZERO_EXTRACT
+ if (GET_CODE (x) == ZERO_EXTRACT
|| GET_CODE (x) == STRICT_LOW_PART)
- mark_referenced_resources (x, res, 0);
+ mark_referenced_resources (x, res, false);
else if (GET_CODE (x) == SUBREG)
x = SUBREG_REG (x);
- if (GET_CODE (x) == MEM)
- mark_referenced_resources (XEXP (x, 0), res, 0);
+ if (MEM_P (x))
+ mark_referenced_resources (XEXP (x, 0), res, false);
return;
case CLOBBER:
{
sequence = PATTERN (NEXT_INSN (insn));
seq_size = XVECLEN (sequence, 0);
- if (GET_CODE (sequence) != SEQUENCE)
- abort ();
+ gcc_assert (GET_CODE (sequence) == SEQUENCE);
}
res->memory = 1;
We assume that they both use and set all registers. Using all
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. */
+ considered dead only if the setjmp call returns nonzero. */
if (find_reg_note (x, REG_SETJMP, NULL))
SET_HARD_REG_SET (res->regs);
}
if (i >= seq_size)
mark_referenced_resources (XEXP (XEXP (link, 0), 0),
- res, 0);
+ res, false);
}
}
}
number of unconditional branches. */
static rtx
-find_dead_or_set_registers (target, res, jump_target, jump_count, set, needed)
- rtx target;
- struct resources *res;
- rtx *jump_target;
- int jump_count;
- struct resources set, needed;
+find_dead_or_set_registers (rtx target, struct resources *res,
+ rtx *jump_target, int jump_count,
+ struct resources set, struct resources needed)
{
HARD_REG_SET scratch;
rtx insn, next;
for (i = 0; i < XVECLEN (PATTERN (insn), 0); i++)
{
this_jump_insn = XVECEXP (PATTERN (insn), 0, i);
- if (GET_CODE (this_jump_insn) == JUMP_INSN)
+ if (JUMP_P (this_jump_insn))
break;
}
}
break;
}
- if (GET_CODE (this_jump_insn) == JUMP_INSN)
+ if (JUMP_P (this_jump_insn))
{
if (jump_count++ < 10)
{
if (jump_count >= 10)
break;
- mark_referenced_resources (insn, &needed, 1);
+ mark_referenced_resources (insn, &needed, true);
/* For an annulled branch, mark_set_resources ignores slots
filled by instructions from the target. This is correct
}
}
- mark_referenced_resources (insn, &needed, 1);
+ mark_referenced_resources (insn, &needed, true);
mark_set_resources (insn, &set, 0, MARK_SRC_DEST_CALL);
COPY_HARD_REG_SET (scratch, set.regs);
/* Given X, a part of an insn, and a pointer to a `struct resource',
RES, indicate which resources are modified by the insn. If
MARK_TYPE is MARK_SRC_DEST_CALL, also mark resources potentially
- set by the called routine. If MARK_TYPE is MARK_DEST, only mark SET_DESTs
+ set by the called routine.
If IN_DEST is nonzero, it means we are inside a SET. Otherwise,
objects are being referenced instead of set.
our computation and thus may be placed in a delay slot. */
void
-mark_set_resources (x, res, in_dest, mark_type)
- rtx x;
- struct resources *res;
- int in_dest;
- enum mark_resource_type mark_type;
+mark_set_resources (rtx x, struct resources *res, int in_dest,
+ enum mark_resource_type mark_type)
{
enum rtx_code code;
int i, j;
case USE:
case CONST_INT:
case CONST_DOUBLE:
+ case CONST_FIXED:
case CONST_VECTOR:
case LABEL_REF:
case SYMBOL_REF:
rtx link;
res->cc = res->memory = 1;
- for (r = 0; r < FIRST_PSEUDO_REGISTER; r++)
- if (call_used_regs[r] || global_regs[r])
- SET_HARD_REG_BIT (res->regs, r);
+
+ IOR_HARD_REG_SET (res->regs, regs_invalidated_by_call);
for (link = CALL_INSN_FUNCTION_USAGE (x);
link; link = XEXP (link, 1))
|| GET_CODE (SET_SRC (x)) != CALL),
mark_type);
- if (mark_type != MARK_DEST)
- mark_set_resources (SET_SRC (x), res, 0, MARK_SRC_DEST);
+ mark_set_resources (SET_SRC (x), res, 0, MARK_SRC_DEST);
return;
case CLOBBER:
case SIGN_EXTRACT:
case ZERO_EXTRACT:
- if (! (mark_type == MARK_DEST && in_dest))
- {
- mark_set_resources (XEXP (x, 0), res, in_dest, MARK_SRC_DEST);
- mark_set_resources (XEXP (x, 1), res, 0, MARK_SRC_DEST);
- mark_set_resources (XEXP (x, 2), res, 0, MARK_SRC_DEST);
- }
+ mark_set_resources (XEXP (x, 0), res, in_dest, MARK_SRC_DEST);
+ mark_set_resources (XEXP (x, 1), res, 0, MARK_SRC_DEST);
+ mark_set_resources (XEXP (x, 2), res, 0, MARK_SRC_DEST);
return;
case MEM:
if (in_dest)
{
res->memory = 1;
- res->unch_memory |= RTX_UNCHANGING_P (x);
+ res->unch_memory |= MEM_READONLY_P (x);
res->volatil |= MEM_VOLATILE_P (x);
}
case SUBREG:
if (in_dest)
{
- if (GET_CODE (SUBREG_REG (x)) != REG)
+ if (!REG_P (SUBREG_REG (x)))
mark_set_resources (SUBREG_REG (x), res, in_dest, mark_type);
else
{
unsigned int regno = subreg_regno (x);
- unsigned int last_regno
- = regno + HARD_REGNO_NREGS (regno, GET_MODE (x));
+ unsigned int last_regno = regno + subreg_nregs (x);
- if (last_regno > FIRST_PSEUDO_REGISTER)
- abort ();
+ gcc_assert (last_regno <= FIRST_PSEUDO_REGISTER);
for (r = regno; r < last_regno; r++)
SET_HARD_REG_BIT (res->regs, r);
}
case REG:
if (in_dest)
{
- 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);
+ gcc_assert (HARD_REGISTER_P (x));
+ add_to_hard_reg_set (&res->regs, GET_MODE (x), REGNO (x));
}
return;
- case STRICT_LOW_PART:
- if (! (mark_type == MARK_DEST && in_dest))
- {
- mark_set_resources (XEXP (x, 0), res, 0, MARK_SRC_DEST);
- return;
- }
-
case UNSPEC_VOLATILE:
case ASM_INPUT:
/* Traditional asm's are always volatile. */
}
}
\f
+/* Return TRUE if INSN is a return, possibly with a filled delay slot. */
+
+static bool
+return_insn_p (const_rtx insn)
+{
+ if (JUMP_P (insn) && GET_CODE (PATTERN (insn)) == RETURN)
+ return true;
+
+ if (NONJUMP_INSN_P (insn) && GET_CODE (PATTERN (insn)) == SEQUENCE)
+ return return_insn_p (XVECEXP (PATTERN (insn), 0, 0));
+
+ return false;
+}
+
/* Set the resources that are live at TARGET.
If TARGET is zero, we refer to the end of the current function and can
(with no intervening active insns) to see if any of them start a basic
block. If we hit the start of the function first, we use block 0.
- Once we have found a basic block and a corresponding first insns, we can
- accurately compute the live status from basic_block_live_regs and
- reg_renumber. (By starting at a label following a BARRIER, we are immune
- to actions taken by reload and jump.) Then we scan all insns between
- that point and our target. For each CLOBBER (or for call-clobbered regs
- when we pass a CALL_INSN), mark the appropriate registers are dead. For
- a SET, mark them as live.
+ Once we have found a basic block and a corresponding first insn, we can
+ accurately compute the live status (by starting at a label following a
+ BARRIER, we are immune to actions taken by reload and jump.) Then we
+ scan all insns between that point and our target. For each CLOBBER (or
+ for call-clobbered regs when we pass a CALL_INSN), mark the appropriate
+ registers are dead. For a SET, mark them as live.
We have to be careful when using REG_DEAD notes because they are not
updated by such things as find_equiv_reg. So keep track of registers
init_resource_info () was invoked before we are called. */
void
-mark_target_live_regs (insns, target, res)
- rtx insns;
- rtx target;
- struct resources *res;
+mark_target_live_regs (rtx insns, rtx target, struct resources *res)
{
int b = -1;
unsigned int i;
return;
}
+ /* Handle return insn. */
+ else if (return_insn_p (target))
+ {
+ *res = end_of_function_needs;
+ mark_referenced_resources (target, res, false);
+ return;
+ }
+
/* We have to assume memory is needed, but the CC isn't. */
res->memory = 1;
res->volatil = res->unch_memory = 0;
information, we can get it from there unless the insn at the
start of the basic block has been deleted. */
if (tinfo && tinfo->block != -1
- && ! INSN_DELETED_P (BLOCK_HEAD (tinfo->block)))
+ && ! INSN_DELETED_P (BB_HEAD (BASIC_BLOCK (tinfo->block))))
b = tinfo->block;
}
{
/* Allocate a place to put our results and chain it into the
hash table. */
- tinfo = (struct target_info *) xmalloc (sizeof (struct target_info));
+ tinfo = XNEW (struct target_info);
tinfo->uid = INSN_UID (target);
tinfo->block = b;
tinfo->next
/* If we found a basic block, get the live registers from it and update
them with anything set or killed between its start and the insn before
- TARGET. Otherwise, we must assume everything is live. */
+ TARGET; this custom life analysis is really about registers so we need
+ to use the LR problem. Otherwise, we must assume everything is live. */
if (b != -1)
{
- regset regs_live = BASIC_BLOCK (b)->global_live_at_start;
- unsigned int j;
- unsigned int regno;
+ regset regs_live = DF_LR_IN (BASIC_BLOCK (b));
rtx start_insn, stop_insn;
- /* Compute hard regs live at start of block -- this is the real hard regs
- marked live, plus live pseudo regs that have been renumbered to
- hard regs. */
-
+ /* Compute hard regs live at start of block. */
REG_SET_TO_HARD_REG_SET (current_live_regs, regs_live);
- EXECUTE_IF_SET_IN_REG_SET
- (regs_live, FIRST_PSEUDO_REGISTER, i,
- {
- if (reg_renumber[i] >= 0)
- {
- regno = reg_renumber[i];
- for (j = regno;
- j < regno + HARD_REGNO_NREGS (regno,
- PSEUDO_REGNO_MODE (i));
- j++)
- SET_HARD_REG_BIT (current_live_regs, j);
- }
- });
-
/* Get starting and ending insn, handling the case where each might
be a SEQUENCE. */
- start_insn = (b == 0 ? insns : BLOCK_HEAD (b));
+ start_insn = (b == ENTRY_BLOCK_PTR->next_bb->index ?
+ insns : BB_HEAD (BASIC_BLOCK (b)));
stop_insn = target;
- if (GET_CODE (start_insn) == INSN
+ if (NONJUMP_INSN_P (start_insn)
&& GET_CODE (PATTERN (start_insn)) == SEQUENCE)
start_insn = XVECEXP (PATTERN (start_insn), 0, 0);
- if (GET_CODE (stop_insn) == INSN
+ if (NONJUMP_INSN_P (stop_insn)
&& GET_CODE (PATTERN (stop_insn)) == SEQUENCE)
stop_insn = next_insn (PREV_INSN (stop_insn));
{
rtx link;
rtx real_insn = insn;
+ enum rtx_code code = GET_CODE (insn);
+
+ if (DEBUG_INSN_P (insn))
+ continue;
/* 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);
- if (GET_CODE (real_insn) == CALL_INSN)
+ if (CALL_P (real_insn))
{
/* CALL clobbers all call-used regs that aren't fixed except
sp, ap, and fp. Do this before setting the result of the
parameters. But they might be early. A CALL_INSN will usually
clobber registers used for parameters. It isn't worth bothering
with the unlikely case when it won't. */
- if ((GET_CODE (real_insn) == INSN
+ if ((NONJUMP_INSN_P (real_insn)
&& GET_CODE (PATTERN (real_insn)) != USE
&& GET_CODE (PATTERN (real_insn)) != CLOBBER)
- || GET_CODE (real_insn) == JUMP_INSN
- || GET_CODE (real_insn) == CALL_INSN)
+ || JUMP_P (real_insn)
+ || CALL_P (real_insn))
{
for (link = REG_NOTES (real_insn); link; link = XEXP (link, 1))
if (REG_NOTE_KIND (link) == REG_DEAD
- && GET_CODE (XEXP (link, 0)) == REG
+ && REG_P (XEXP (link, 0))
&& REGNO (XEXP (link, 0)) < FIRST_PSEUDO_REGISTER)
- {
- 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);
- }
+ add_to_hard_reg_set (&pending_dead_regs,
+ GET_MODE (XEXP (link, 0)),
+ REGNO (XEXP (link, 0)));
note_stores (PATTERN (real_insn), update_live_status, NULL);
These notes will always be accurate. */
for (link = REG_NOTES (real_insn); link; link = XEXP (link, 1))
if (REG_NOTE_KIND (link) == REG_UNUSED
- && GET_CODE (XEXP (link, 0)) == REG
+ && REG_P (XEXP (link, 0))
&& REGNO (XEXP (link, 0)) < FIRST_PSEUDO_REGISTER)
- {
- 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);
- }
+ remove_from_hard_reg_set (¤t_live_regs,
+ GET_MODE (XEXP (link, 0)),
+ REGNO (XEXP (link, 0)));
}
- else if (GET_CODE (real_insn) == CODE_LABEL)
+ else if (LABEL_P (real_insn))
{
+ basic_block bb;
+
/* A label clobbers the pending dead registers since neither
reload nor jump will propagate a value across a label. */
AND_COMPL_HARD_REG_SET (current_live_regs, pending_dead_regs);
CLEAR_HARD_REG_SET (pending_dead_regs);
+
+ /* We must conservatively assume that all registers that used
+ to be live here still are. The fallthrough edge may have
+ left a live register uninitialized. */
+ bb = BLOCK_FOR_INSN (real_insn);
+ if (bb)
+ {
+ HARD_REG_SET extra_live;
+
+ REG_SET_TO_HARD_REG_SET (extra_live, DF_LR_IN (bb));
+ IOR_HARD_REG_SET (current_live_regs, extra_live);
+ }
}
/* The beginning of the epilogue corresponds to the end of the
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)
+ else if (NOTE_P (real_insn)
+ && NOTE_KIND (real_insn) == NOTE_INSN_EPILOGUE_BEG)
IOR_HARD_REG_SET (current_live_regs, start_of_epilogue_needs.regs);
}
/* Include JUMP_INSN in the needed registers. */
for (insn = target; insn != stop_insn; insn = next_active_insn (insn))
{
- mark_referenced_resources (insn, &needed, 1);
+ mark_referenced_resources (insn, &needed, true);
COPY_HARD_REG_SET (scratch, needed.regs);
AND_COMPL_HARD_REG_SET (scratch, set.regs);
This should be invoked before the first call to mark_target_live_regs. */
void
-init_resource_info (epilogue_insn)
- rtx epilogue_insn;
+init_resource_info (rtx epilogue_insn)
{
int i;
+ basic_block bb;
/* Indicate what resources are required to be valid at the end of the current
function. The condition code never is and memory always is. If the
frame pointer is needed, it is and so is the stack pointer unless
- EXIT_IGNORE_STACK is non-zero. If the frame pointer is not needed, the
+ EXIT_IGNORE_STACK is nonzero. If the frame pointer is not needed, the
stack pointer is. Registers used to return the function value are
needed. Registers holding global variables are needed. */
#if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
SET_HARD_REG_BIT (end_of_function_needs.regs, HARD_FRAME_POINTER_REGNUM);
#endif
-#ifdef EXIT_IGNORE_STACK
if (! EXIT_IGNORE_STACK
|| current_function_sp_is_unchanging)
-#endif
SET_HARD_REG_BIT (end_of_function_needs.regs, STACK_POINTER_REGNUM);
}
else
SET_HARD_REG_BIT (end_of_function_needs.regs, STACK_POINTER_REGNUM);
- if (current_function_return_rtx != 0)
- mark_referenced_resources (current_function_return_rtx,
- &end_of_function_needs, 1);
+ if (crtl->return_rtx != 0)
+ mark_referenced_resources (crtl->return_rtx,
+ &end_of_function_needs, true);
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (global_regs[i]
start_of_epilogue_needs = end_of_function_needs;
while ((epilogue_insn = next_nonnote_insn (epilogue_insn)))
- mark_set_resources (epilogue_insn, &end_of_function_needs, 0,
- MARK_SRC_DEST_CALL);
+ {
+ mark_set_resources (epilogue_insn, &end_of_function_needs, 0,
+ MARK_SRC_DEST_CALL);
+ if (return_insn_p (epilogue_insn))
+ break;
+ }
/* 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));
+ target_hash_table = XCNEWVEC (struct target_info *, TARGET_HASH_PRIME);
+ bb_ticks = XCNEWVEC (int, last_basic_block);
+
+ /* Set the BLOCK_FOR_INSN of each label that starts a basic block. */
+ FOR_EACH_BB (bb)
+ if (LABEL_P (BB_HEAD (bb)))
+ BLOCK_FOR_INSN (BB_HEAD (bb)) = bb;
}
\f
-/* Free up the resources allcated to mark_target_live_regs (). This
+/* Free up the resources allocated to mark_target_live_regs (). This
should be invoked after the last call to mark_target_live_regs (). */
void
-free_resource_info ()
+free_resource_info (void)
{
+ basic_block bb;
+
if (target_hash_table != NULL)
{
int i;
free (bb_ticks);
bb_ticks = NULL;
}
+
+ FOR_EACH_BB (bb)
+ if (LABEL_P (BB_HEAD (bb)))
+ BLOCK_FOR_INSN (BB_HEAD (bb)) = NULL;
}
\f
/* Clear any hashed information that we have stored for INSN. */
void
-clear_hashed_info_for_insn (insn)
- rtx insn;
+clear_hashed_info_for_insn (rtx insn)
{
struct target_info *tinfo;
/* Increment the tick count for the basic block that contains INSN. */
void
-incr_ticks_for_insn (insn)
- rtx insn;
+incr_ticks_for_insn (rtx insn)
{
int b = find_basic_block (insn, MAX_DELAY_SLOT_LIVE_SEARCH);
/* Add TRIAL to the set of resources used at the end of the current
function. */
void
-mark_end_of_function_resources (trial, include_delayed_effects)
- rtx trial;
- int include_delayed_effects;
+mark_end_of_function_resources (rtx trial, bool include_delayed_effects)
{
mark_referenced_resources (trial, &end_of_function_needs,
include_delayed_effects);
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