/* Instruction scheduling pass. This file computes dependencies between
instructions.
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.
Contributed by Michael Tiemann (tiemann@cygnus.com) Enhanced by,
and currently maintained by, Jim Wilson (wilson@cygnus.com)
#include "system.h"
#include "coretypes.h"
#include "tm.h"
+#include "diagnostic-core.h"
#include "toplev.h"
#include "rtl.h"
#include "tm_p.h"
static int deps_may_trap_p (const_rtx);
static void add_dependence_list (rtx, rtx, int, enum reg_note);
-static void add_dependence_list_and_free (struct deps *, rtx,
+static void add_dependence_list_and_free (struct deps_desc *, rtx,
rtx *, int, enum reg_note);
static void delete_all_dependences (rtx);
static void fixup_sched_groups (rtx);
-static void flush_pending_lists (struct deps *, rtx, int, int);
-static void sched_analyze_1 (struct deps *, rtx, rtx);
-static void sched_analyze_2 (struct deps *, rtx, rtx);
-static void sched_analyze_insn (struct deps *, rtx, rtx);
+static void flush_pending_lists (struct deps_desc *, rtx, int, int);
+static void sched_analyze_1 (struct deps_desc *, rtx, rtx);
+static void sched_analyze_2 (struct deps_desc *, rtx, rtx);
+static void sched_analyze_insn (struct deps_desc *, rtx, rtx);
static bool sched_has_condition_p (const_rtx);
static int conditions_mutex_p (const_rtx, const_rtx, bool, bool);
/* The following instructions, which depend on a speculatively scheduled
instruction, cannot be speculatively scheduled along. */
{
- if (may_trap_p (PATTERN (insn)))
- /* If instruction might trap, it cannot be speculatively scheduled.
+ if (may_trap_or_fault_p (PATTERN (insn)))
+ /* If instruction might fault, it cannot be speculatively scheduled.
For control speculation it's obvious why and for data speculation
it's because the insn might get wrong input if speculation
wasn't successful. */
is not readonly. */
static void
-add_dependence_list_and_free (struct deps *deps, rtx insn, rtx *listp,
+add_dependence_list_and_free (struct deps_desc *deps, rtx insn, rtx *listp,
int uncond, enum reg_note dep_type)
{
rtx list, next;
- if (deps->readonly)
+ /* We don't want to short-circuit dependencies involving debug
+ insns, because they may cause actual dependencies to be
+ disregarded. */
+ if (deps->readonly || DEBUG_INSN_P (insn))
{
add_dependence_list (insn, *listp, uncond, dep_type);
return;
delete_all_dependences (insn);
- prev_nonnote = prev_nonnote_insn (insn);
- while (DEBUG_INSN_P (prev_nonnote))
- prev_nonnote = prev_nonnote_insn (prev_nonnote);
+ prev_nonnote = prev_nonnote_nondebug_insn (insn);
if (BLOCK_FOR_INSN (insn) == BLOCK_FOR_INSN (prev_nonnote)
&& ! sched_insns_conditions_mutex_p (insn, prev_nonnote))
add_dependence (insn, prev_nonnote, REG_DEP_ANTI);
so that we can do memory aliasing on it. */
static void
-add_insn_mem_dependence (struct deps *deps, bool read_p,
+add_insn_mem_dependence (struct deps_desc *deps, bool read_p,
rtx insn, rtx mem)
{
rtx *insn_list;
dependencies for a read operation, similarly with FOR_WRITE. */
static void
-flush_pending_lists (struct deps *deps, rtx insn, int for_read,
+flush_pending_lists (struct deps_desc *deps, rtx insn, int for_read,
int for_write)
{
if (for_write)
/* Set up insn register uses for INSN and dependency context DEPS. */
static void
-setup_insn_reg_uses (struct deps *deps, rtx insn)
+setup_insn_reg_uses (struct deps_desc *deps, rtx insn)
{
unsigned i;
reg_set_iterator rsi;
len = sizeof (struct reg_pressure_data) * ira_reg_class_cover_size;
pressure_info
= INSN_REG_PRESSURE (insn) = (struct reg_pressure_data *) xmalloc (len);
- INSN_MAX_REG_PRESSURE (insn) = (int *) xmalloc (ira_reg_class_cover_size
- * sizeof (int));
+ INSN_MAX_REG_PRESSURE (insn) = (int *) xcalloc (ira_reg_class_cover_size
+ * sizeof (int), 1);
for (i = 0; i < ira_reg_class_cover_size; i++)
{
cl = ira_reg_class_cover[i];
/* Extend reg info for the deps context DEPS given that
we have just generated a register numbered REGNO. */
static void
-extend_deps_reg_info (struct deps *deps, int regno)
+extend_deps_reg_info (struct deps_desc *deps, int regno)
{
int max_regno = regno + 1;
CLOBBER, PRE_DEC, POST_DEC, PRE_INC, POST_INC or USE. */
static void
-sched_analyze_reg (struct deps *deps, int regno, enum machine_mode mode,
+sched_analyze_reg (struct deps_desc *deps, int regno, enum machine_mode mode,
enum rtx_code ref, rtx insn)
{
/* We could emit new pseudos in renaming. Extend the reg structures. */
destination of X, and reads of everything mentioned. */
static void
-sched_analyze_1 (struct deps *deps, rtx x, rtx insn)
+sched_analyze_1 (struct deps_desc *deps, rtx x, rtx insn)
{
rtx dest = XEXP (x, 0);
enum rtx_code code = GET_CODE (x);
= targetm.addr_space.address_mode (MEM_ADDR_SPACE (dest));
t = shallow_copy_rtx (dest);
- cselib_lookup (XEXP (t, 0), address_mode, 1);
+ cselib_lookup_from_insn (XEXP (t, 0), address_mode, 1, insn);
XEXP (t, 0) = cselib_subst_to_values (XEXP (t, 0));
}
t = canon_rtx (t);
/* Analyze the uses of memory and registers in rtx X in INSN. */
static void
-sched_analyze_2 (struct deps *deps, rtx x, rtx insn)
+sched_analyze_2 (struct deps_desc *deps, rtx x, rtx insn)
{
int i;
int j;
= targetm.addr_space.address_mode (MEM_ADDR_SPACE (t));
t = shallow_copy_rtx (t);
- cselib_lookup (XEXP (t, 0), address_mode, 1);
+ cselib_lookup_from_insn (XEXP (t, 0), address_mode, 1, insn);
XEXP (t, 0) = cselib_subst_to_values (XEXP (t, 0));
}
/* Analyze an INSN with pattern X to find all dependencies. */
static void
-sched_analyze_insn (struct deps *deps, rtx x, rtx insn)
+sched_analyze_insn (struct deps_desc *deps, rtx x, rtx insn)
{
RTX_CODE code = GET_CODE (x);
rtx link;
if (JUMP_P (insn))
{
rtx next;
- next = next_nonnote_insn (insn);
- while (next && DEBUG_INSN_P (next))
- next = next_nonnote_insn (next);
+ next = next_nonnote_nondebug_insn (insn);
if (next && BARRIER_P (next))
reg_pending_barrier = MOVE_BARRIER;
else
This insn must be a simple move of a hard reg to a pseudo or
vice-versa.
- We must avoid moving these insns for correctness on
- SMALL_REGISTER_CLASS machines, and for special registers like
+ We must avoid moving these insns for correctness on targets
+ with small register classes, and for special registers like
PIC_OFFSET_TABLE_REGNUM. For simplicity, extend this to all
hard regs for all targets. */
/* Analyze INSN with DEPS as a context. */
void
-deps_analyze_insn (struct deps *deps, rtx insn)
+deps_analyze_insn (struct deps_desc *deps, rtx insn)
{
if (sched_deps_info->start_insn)
sched_deps_info->start_insn (insn);
/* Initialize DEPS for the new block beginning with HEAD. */
void
-deps_start_bb (struct deps *deps, rtx head)
+deps_start_bb (struct deps_desc *deps, rtx head)
{
gcc_assert (!deps->readonly);
hard registers correct. */
if (! reload_completed && !LABEL_P (head))
{
- rtx insn = prev_nonnote_insn (head);
+ rtx insn = prev_nonnote_nondebug_insn (head);
- while (insn && DEBUG_INSN_P (insn))
- insn = prev_nonnote_insn (insn);
if (insn && CALL_P (insn))
deps->in_post_call_group_p = post_call_initial;
}
/* Analyze every insn between HEAD and TAIL inclusive, creating backward
dependencies for each insn. */
void
-sched_analyze (struct deps *deps, rtx head, rtx tail)
+sched_analyze (struct deps_desc *deps, rtx head, rtx tail)
{
rtx insn;
if (sched_deps_info->use_cselib)
- cselib_init (true);
+ cselib_init (CSELIB_RECORD_MEMORY);
deps_start_bb (deps, head);
\f
/* Initialize variables for region data dependence analysis.
When LAZY_REG_LAST is true, do not allocate reg_last array
- of struct deps immediately. */
+ of struct deps_desc immediately. */
void
-init_deps (struct deps *deps, bool lazy_reg_last)
+init_deps (struct deps_desc *deps, bool lazy_reg_last)
{
int max_reg = (reload_completed ? FIRST_PSEUDO_REGISTER : max_reg_num ());
/* Init only reg_last field of DEPS, which was not allocated before as
we inited DEPS lazily. */
void
-init_deps_reg_last (struct deps *deps)
+init_deps_reg_last (struct deps_desc *deps)
{
gcc_assert (deps && deps->max_reg > 0);
gcc_assert (deps->reg_last == NULL);
/* Free insn lists found in DEPS. */
void
-free_deps (struct deps *deps)
+free_deps (struct deps_desc *deps)
{
unsigned i;
reg_set_iterator rsi;
/* Remove INSN from dependence contexts DEPS. Caution: reg_conditional_sets
is not handled. */
void
-remove_from_deps (struct deps *deps, rtx insn)
+remove_from_deps (struct deps_desc *deps, rtx insn)
{
int removed;
unsigned i;
fprintf (f, "}");
}
-void
+DEBUG_FUNCTION void
debug_ds (ds_t s)
{
dump_ds (stderr, s);
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