/* Build live ranges for pseudos.
- Copyright (C) 2010-2017 Free Software Foundation, Inc.
+ Copyright (C) 2010-2020 Free Software Foundation, Inc.
Contributed by Vladimir Makarov <vmakarov@redhat.com>.
This file is part of GCC.
#include "sparseset.h"
#include "lra-int.h"
#include "target.h"
+#include "function-abi.h"
/* Program points are enumerated by numbers from range
0..LRA_LIVE_MAX_POINT-1. There are approximately two times more
/* Set of pseudos and hard registers start living/dying in the current
insn. These sets are used to update REG_DEAD and REG_UNUSED notes
- in the insn. */
+ in the insn. */
static sparseset start_living, start_dying;
/* Set of pseudos and hard regs dead and unused in the current
return false;
}
-/* The function processing birth of hard register REGNO. It updates
- living hard regs, START_LIVING, and conflict hard regs for living
- pseudos. Conflict hard regs for the pic pseudo is not updated if
- REGNO is REAL_PIC_OFFSET_TABLE_REGNUM and CHECK_PIC_PSEUDO_P is
- true. */
+enum point_type {
+ DEF_POINT,
+ USE_POINT
+};
+
+/* Return TRUE if set A contains a pseudo register, otherwise, return FALSE. */
+static bool
+sparseset_contains_pseudos_p (sparseset a)
+{
+ int regno;
+ EXECUTE_IF_SET_IN_SPARSESET (a, regno)
+ if (!HARD_REGISTER_NUM_P (regno))
+ return true;
+ return false;
+}
+
+/* Mark pseudo REGNO as living or dying at program point POINT, depending on
+ whether TYPE is a definition or a use. If this is the first reference to
+ REGNO that we've encountered, then create a new live range for it. */
+
static void
-make_hard_regno_born (int regno, bool check_pic_pseudo_p ATTRIBUTE_UNUSED)
+update_pseudo_point (int regno, int point, enum point_type type)
{
- unsigned int i;
+ lra_live_range_t p;
+
+ /* Don't compute points for hard registers. */
+ if (HARD_REGISTER_NUM_P (regno))
+ return;
+
+ if (complete_info_p || lra_get_regno_hard_regno (regno) < 0)
+ {
+ if (type == DEF_POINT)
+ {
+ if (sparseset_bit_p (pseudos_live, regno))
+ {
+ p = lra_reg_info[regno].live_ranges;
+ lra_assert (p != NULL);
+ p->finish = point;
+ }
+ }
+ else /* USE_POINT */
+ {
+ if (!sparseset_bit_p (pseudos_live, regno)
+ && ((p = lra_reg_info[regno].live_ranges) == NULL
+ || (p->finish != point && p->finish + 1 != point)))
+ lra_reg_info[regno].live_ranges
+ = create_live_range (regno, point, -1, p);
+ }
+ }
+}
- lra_assert (regno < FIRST_PSEUDO_REGISTER);
- if (TEST_HARD_REG_BIT (hard_regs_live, regno))
+/* The corresponding bitmaps of BB currently being processed. */
+static bitmap bb_killed_pseudos, bb_gen_pseudos;
+
+/* Record hard register REGNO as now being live. It updates
+ living hard regs and START_LIVING. */
+static void
+make_hard_regno_live (int regno)
+{
+ lra_assert (HARD_REGISTER_NUM_P (regno));
+ if (TEST_HARD_REG_BIT (hard_regs_live, regno)
+ || TEST_HARD_REG_BIT (eliminable_regset, regno))
return;
SET_HARD_REG_BIT (hard_regs_live, regno);
sparseset_set_bit (start_living, regno);
- EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, i)
-#ifdef REAL_PIC_OFFSET_TABLE_REGNUM
- if (! check_pic_pseudo_p
- || regno != REAL_PIC_OFFSET_TABLE_REGNUM
- || pic_offset_table_rtx == NULL
- || i != REGNO (pic_offset_table_rtx))
-#endif
- SET_HARD_REG_BIT (lra_reg_info[i].conflict_hard_regs, regno);
+ if (fixed_regs[regno] || TEST_HARD_REG_BIT (hard_regs_spilled_into, regno))
+ bitmap_set_bit (bb_gen_pseudos, regno);
}
-/* Process the death of hard register REGNO. This updates
- hard_regs_live and START_DYING. */
+/* Process the definition of hard register REGNO. This updates
+ hard_regs_live, START_DYING and conflict hard regs for living
+ pseudos. */
static void
make_hard_regno_dead (int regno)
{
- lra_assert (regno < FIRST_PSEUDO_REGISTER);
+ if (TEST_HARD_REG_BIT (eliminable_regset, regno))
+ return;
+
+ lra_assert (HARD_REGISTER_NUM_P (regno));
+ unsigned int i;
+ EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, i)
+ SET_HARD_REG_BIT (lra_reg_info[i].conflict_hard_regs, regno);
+
if (! TEST_HARD_REG_BIT (hard_regs_live, regno))
return;
- sparseset_set_bit (start_dying, regno);
CLEAR_HARD_REG_BIT (hard_regs_live, regno);
+ sparseset_set_bit (start_dying, regno);
+ if (fixed_regs[regno] || TEST_HARD_REG_BIT (hard_regs_spilled_into, regno))
+ {
+ bitmap_clear_bit (bb_gen_pseudos, regno);
+ bitmap_set_bit (bb_killed_pseudos, regno);
+ }
}
-/* Mark pseudo REGNO as living at program point POINT, update conflicting
- hard registers of the pseudo and START_LIVING, and start a new live
- range for the pseudo corresponding to REGNO if it is necessary. */
+/* Mark pseudo REGNO as now being live and update START_LIVING. */
static void
-mark_pseudo_live (int regno, int point)
+mark_pseudo_live (int regno)
{
- lra_live_range_t p;
+ lra_assert (!HARD_REGISTER_NUM_P (regno));
+ if (sparseset_bit_p (pseudos_live, regno))
+ return;
- lra_assert (regno >= FIRST_PSEUDO_REGISTER);
- lra_assert (! sparseset_bit_p (pseudos_live, regno));
sparseset_set_bit (pseudos_live, regno);
- IOR_HARD_REG_SET (lra_reg_info[regno].conflict_hard_regs, hard_regs_live);
-
- if ((complete_info_p || lra_get_regno_hard_regno (regno) < 0)
- && ((p = lra_reg_info[regno].live_ranges) == NULL
- || (p->finish != point && p->finish + 1 != point)))
- lra_reg_info[regno].live_ranges
- = create_live_range (regno, point, -1, p);
sparseset_set_bit (start_living, regno);
}
-/* Mark pseudo REGNO as not living at program point POINT and update
- START_DYING.
- This finishes the current live range for the pseudo corresponding
- to REGNO. */
+/* Mark pseudo REGNO as now being dead and update START_DYING. */
static void
-mark_pseudo_dead (int regno, int point)
+mark_pseudo_dead (int regno)
{
- lra_live_range_t p;
+ lra_assert (!HARD_REGISTER_NUM_P (regno));
+ lra_reg_info[regno].conflict_hard_regs |= hard_regs_live;
+ if (!sparseset_bit_p (pseudos_live, regno))
+ return;
- lra_assert (regno >= FIRST_PSEUDO_REGISTER);
- lra_assert (sparseset_bit_p (pseudos_live, regno));
sparseset_clear_bit (pseudos_live, regno);
sparseset_set_bit (start_dying, regno);
- if (complete_info_p || lra_get_regno_hard_regno (regno) < 0)
- {
- p = lra_reg_info[regno].live_ranges;
- lra_assert (p != NULL);
- p->finish = point;
- }
}
-/* The corresponding bitmaps of BB currently being processed. */
-static bitmap bb_killed_pseudos, bb_gen_pseudos;
-
-/* Mark register REGNO (pseudo or hard register) in MODE as live at
- program point POINT. Update BB_GEN_PSEUDOS.
- Return TRUE if the liveness tracking sets were modified, or FALSE
- if nothing changed. */
-static bool
-mark_regno_live (int regno, machine_mode mode, int point)
+/* Mark register REGNO (pseudo or hard register) in MODE as being live
+ and update BB_GEN_PSEUDOS. */
+static void
+mark_regno_live (int regno, machine_mode mode)
{
int last;
- bool changed = false;
- if (regno < FIRST_PSEUDO_REGISTER)
+ if (HARD_REGISTER_NUM_P (regno))
{
- for (last = regno + hard_regno_nregs[regno][mode];
- regno < last;
- regno++)
- make_hard_regno_born (regno, false);
+ for (last = end_hard_regno (mode, regno); regno < last; regno++)
+ make_hard_regno_live (regno);
}
else
{
- if (! sparseset_bit_p (pseudos_live, regno))
- {
- mark_pseudo_live (regno, point);
- changed = true;
- }
+ mark_pseudo_live (regno);
bitmap_set_bit (bb_gen_pseudos, regno);
}
- return changed;
}
-/* Mark register REGNO in MODE as dead at program point POINT. Update
- BB_GEN_PSEUDOS and BB_KILLED_PSEUDOS. Return TRUE if the liveness
- tracking sets were modified, or FALSE if nothing changed. */
-static bool
-mark_regno_dead (int regno, machine_mode mode, int point)
+/* Mark register REGNO (pseudo or hard register) in MODE as being dead
+ and update BB_GEN_PSEUDOS and BB_KILLED_PSEUDOS. */
+static void
+mark_regno_dead (int regno, machine_mode mode)
{
int last;
- bool changed = false;
- if (regno < FIRST_PSEUDO_REGISTER)
+ if (HARD_REGISTER_NUM_P (regno))
{
- for (last = regno + hard_regno_nregs[regno][mode];
- regno < last;
- regno++)
+ for (last = end_hard_regno (mode, regno); regno < last; regno++)
make_hard_regno_dead (regno);
}
else
{
- if (sparseset_bit_p (pseudos_live, regno))
- {
- mark_pseudo_dead (regno, point);
- changed = true;
- }
+ mark_pseudo_dead (regno);
bitmap_clear_bit (bb_gen_pseudos, regno);
bitmap_set_bit (bb_killed_pseudos, regno);
}
- return changed;
}
\f
/* Structure describing local BB data used for pseudo
live-analysis. */
-struct bb_data_pseudos
+class bb_data_pseudos
{
+public:
/* Basic block about which the below data are. */
basic_block bb;
bitmap_head killed_pseudos; /* pseudos killed in the BB. */
};
/* Array for all BB data. Indexed by the corresponding BB index. */
-typedef struct bb_data_pseudos *bb_data_t;
+typedef class bb_data_pseudos *bb_data_t;
/* All basic block data are referred through the following array. */
static bb_data_t bb_data;
{
bitmap_initialize (&all_hard_regs_bitmap, ®_obstack);
bitmap_set_range (&all_hard_regs_bitmap, 0, FIRST_PSEUDO_REGISTER);
- bb_data = XNEWVEC (struct bb_data_pseudos, last_basic_block_for_fn (cfun));
+ bb_data = XNEWVEC (class bb_data_pseudos, last_basic_block_for_fn (cfun));
bitmap_initialize (&all_blocks, ®_obstack);
basic_block bb;
}
}
-/* Check that REGNO living through calls and setjumps, set up conflict
- regs using LAST_CALL_USED_REG_SET, and clear corresponding bits in
- PSEUDOS_LIVE_THROUGH_CALLS and PSEUDOS_LIVE_THROUGH_SETJUMPS. */
+/* Check whether REGNO lives through calls and setjmps and clear
+ the corresponding bits in PSEUDOS_LIVE_THROUGH_CALLS and
+ PSEUDOS_LIVE_THROUGH_SETJUMPS. All calls in the region described
+ by PSEUDOS_LIVE_THROUGH_CALLS have the given ABI. */
+
static inline void
-check_pseudos_live_through_calls (int regno,
- HARD_REG_SET last_call_used_reg_set)
+check_pseudos_live_through_calls (int regno, const function_abi &abi)
{
- int hr;
-
if (! sparseset_bit_p (pseudos_live_through_calls, regno))
return;
+
+ machine_mode mode = PSEUDO_REGNO_MODE (regno);
+
sparseset_clear_bit (pseudos_live_through_calls, regno);
- IOR_HARD_REG_SET (lra_reg_info[regno].conflict_hard_regs,
- last_call_used_reg_set);
-
- for (hr = 0; hr < FIRST_PSEUDO_REGISTER; hr++)
- if (targetm.hard_regno_call_part_clobbered (hr,
- PSEUDO_REGNO_MODE (regno)))
- SET_HARD_REG_BIT (lra_reg_info[regno].conflict_hard_regs, hr);
- lra_reg_info[regno].call_p = true;
+ lra_reg_info[regno].conflict_hard_regs |= abi.mode_clobbers (mode);
if (! sparseset_bit_p (pseudos_live_through_setjumps, regno))
return;
sparseset_clear_bit (pseudos_live_through_setjumps, regno);
static inline bool
reg_early_clobber_p (const struct lra_insn_reg *reg, int n_alt)
{
- return (reg->early_clobber
- && (n_alt < 0 || TEST_BIT (reg->early_clobber_alts, n_alt)));
+ return (n_alt == LRA_UNKNOWN_ALT
+ ? reg->early_clobber_alts != 0
+ : (n_alt != LRA_NON_CLOBBERED_ALT
+ && TEST_BIT (reg->early_clobber_alts, n_alt)));
}
/* Process insns of the basic block BB to update pseudo live ranges,
rtx_insn *next;
rtx link, *link_loc;
bool need_curr_point_incr;
- HARD_REG_SET last_call_used_reg_set;
-
+ /* Only has a meaningful value once we've seen a call. */
+ function_abi last_call_abi = default_function_abi;
+
reg_live_out = df_get_live_out (bb);
sparseset_clear (pseudos_live);
sparseset_clear (pseudos_live_through_calls);
sparseset_clear (pseudos_live_through_setjumps);
- CLEAR_HARD_REG_SET (last_call_used_reg_set);
REG_SET_TO_HARD_REG_SET (hard_regs_live, reg_live_out);
- AND_COMPL_HARD_REG_SET (hard_regs_live, eliminable_regset);
+ hard_regs_live &= ~eliminable_regset;
EXECUTE_IF_SET_IN_BITMAP (reg_live_out, FIRST_PSEUDO_REGISTER, j, bi)
- mark_pseudo_live (j, curr_point);
+ {
+ update_pseudo_point (j, curr_point, USE_POINT);
+ mark_pseudo_live (j);
+ }
bb_gen_pseudos = &get_bb_data (bb)->gen_pseudos;
bb_killed_pseudos = &get_bb_data (bb)->killed_pseudos;
set = single_set (curr_insn);
if (dead_insn_p && set != NULL_RTX
- && REG_P (SET_DEST (set)) && REGNO (SET_DEST (set)) >= FIRST_PSEUDO_REGISTER
+ && REG_P (SET_DEST (set)) && !HARD_REGISTER_P (SET_DEST (set))
&& find_reg_note (curr_insn, REG_EH_REGION, NULL_RTX) == NULL_RTX
&& ! may_trap_p (PATTERN (curr_insn))
/* Don't do premature remove of pic offset pseudo as we can
remove_p = false;
break;
}
+
if (remove_p && ! volatile_refs_p (PATTERN (curr_insn)))
{
dst_regno = REGNO (SET_DEST (set));
if (partial_subreg_p (lra_reg_info[regno].biggest_mode,
reg->biggest_mode))
lra_reg_info[regno].biggest_mode = reg->biggest_mode;
- if (regno < FIRST_PSEUDO_REGISTER)
+ if (HARD_REGISTER_NUM_P (regno))
{
lra_hard_reg_usage[regno] += freq;
/* A hard register explicitly can be used in small mode,
but implicitly it can be used in natural mode as a
part of multi-register group. Process this case
here. */
- for (i = 1; i < hard_regno_nregs[regno][reg->biggest_mode]; i++)
+ for (i = 1; i < hard_regno_nregs (regno, reg->biggest_mode); i++)
if (partial_subreg_p (lra_reg_info[regno + i].biggest_mode,
GET_MODE (regno_reg_rtx[regno + i])))
lra_reg_info[regno + i].biggest_mode
}
call_p = CALL_P (curr_insn);
+
+ /* If we have a simple register copy and the source reg is live after
+ this instruction, then remove the source reg from the live set so
+ that it will not conflict with the destination reg. */
+ rtx ignore_reg = non_conflicting_reg_copy_p (curr_insn);
+ if (ignore_reg != NULL_RTX)
+ {
+ int ignore_regno = REGNO (ignore_reg);
+ if (HARD_REGISTER_NUM_P (ignore_regno)
+ && TEST_HARD_REG_BIT (hard_regs_live, ignore_regno))
+ CLEAR_HARD_REG_BIT (hard_regs_live, ignore_regno);
+ else if (!HARD_REGISTER_NUM_P (ignore_regno)
+ && sparseset_bit_p (pseudos_live, ignore_regno))
+ sparseset_clear_bit (pseudos_live, ignore_regno);
+ else
+ /* We don't need any special handling of the source reg if
+ it is dead after this instruction. */
+ ignore_reg = NULL_RTX;
+ }
+
src_regno = (set != NULL_RTX && REG_P (SET_SRC (set))
? REGNO (SET_SRC (set)) : -1);
dst_regno = (set != NULL_RTX && REG_P (SET_DEST (set))
/* Check that source regno does not conflict with
destination regno to exclude most impossible
preferences. */
- && (((src_regno >= FIRST_PSEUDO_REGISTER
+ && (((!HARD_REGISTER_NUM_P (src_regno)
&& (! sparseset_bit_p (pseudos_live, src_regno)
- || (dst_regno >= FIRST_PSEUDO_REGISTER
+ || (!HARD_REGISTER_NUM_P (dst_regno)
&& lra_reg_val_equal_p (src_regno,
lra_reg_info[dst_regno].val,
lra_reg_info[dst_regno].offset))))
- || (src_regno < FIRST_PSEUDO_REGISTER
+ || (HARD_REGISTER_NUM_P (src_regno)
&& ! TEST_HARD_REG_BIT (hard_regs_live, src_regno)))
/* It might be 'inheritance pseudo <- reload pseudo'. */
|| (src_regno >= lra_constraint_new_regno_start
}
else if (dst_regno >= lra_constraint_new_regno_start)
{
- if ((hard_regno = src_regno) >= FIRST_PSEUDO_REGISTER)
+ if (!HARD_REGISTER_NUM_P (hard_regno = src_regno))
hard_regno = reg_renumber[src_regno];
regno = dst_regno;
}
else if (src_regno >= lra_constraint_new_regno_start)
{
- if ((hard_regno = dst_regno) >= FIRST_PSEUDO_REGISTER)
+ if (!HARD_REGISTER_NUM_P (hard_regno = dst_regno))
hard_regno = reg_renumber[dst_regno];
regno = src_regno;
}
sparseset_clear (start_living);
- /* Try to avoid unnecessary program point increments, this saves
- a lot of time in remove_some_program_points_and_update_live_ranges.
- We only need an increment if something becomes live or dies at this
- program point. */
- need_curr_point_incr = false;
-
/* Mark each defined value as live. We need to do this for
unused values because they still conflict with quantities
that are live at the time of the definition. */
for (reg = curr_id->regs; reg != NULL; reg = reg->next)
if (reg->type != OP_IN)
{
- need_curr_point_incr
- |= mark_regno_live (reg->regno, reg->biggest_mode,
- curr_point);
- check_pseudos_live_through_calls (reg->regno,
- last_call_used_reg_set);
+ update_pseudo_point (reg->regno, curr_point, USE_POINT);
+ mark_regno_live (reg->regno, reg->biggest_mode);
+ /* ??? Should be a no-op for unused registers. */
+ check_pseudos_live_through_calls (reg->regno, last_call_abi);
}
for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next)
if (reg->type != OP_IN)
- make_hard_regno_born (reg->regno, false);
+ make_hard_regno_live (reg->regno);
if (curr_id->arg_hard_regs != NULL)
for (i = 0; (regno = curr_id->arg_hard_regs[i]) >= 0; i++)
- if (regno >= FIRST_PSEUDO_REGISTER)
+ if (!HARD_REGISTER_NUM_P (regno))
/* It is a clobber. */
- make_hard_regno_born (regno - FIRST_PSEUDO_REGISTER, false);
+ make_hard_regno_live (regno - FIRST_PSEUDO_REGISTER);
sparseset_copy (unused_set, start_living);
/* See which defined values die here. */
for (reg = curr_id->regs; reg != NULL; reg = reg->next)
- if (reg->type == OP_OUT
+ if (reg->type != OP_IN
&& ! reg_early_clobber_p (reg, n_alt) && ! reg->subreg_p)
- need_curr_point_incr
- |= mark_regno_dead (reg->regno, reg->biggest_mode,
- curr_point);
+ {
+ if (reg->type == OP_OUT)
+ update_pseudo_point (reg->regno, curr_point, DEF_POINT);
+ mark_regno_dead (reg->regno, reg->biggest_mode);
+ }
for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next)
- if (reg->type == OP_OUT
+ if (reg->type != OP_IN
&& ! reg_early_clobber_p (reg, n_alt) && ! reg->subreg_p)
make_hard_regno_dead (reg->regno);
if (curr_id->arg_hard_regs != NULL)
for (i = 0; (regno = curr_id->arg_hard_regs[i]) >= 0; i++)
- if (regno >= FIRST_PSEUDO_REGISTER)
+ if (!HARD_REGISTER_NUM_P (regno))
/* It is a clobber. */
make_hard_regno_dead (regno - FIRST_PSEUDO_REGISTER);
if (call_p)
{
- if (! flag_ipa_ra)
- COPY_HARD_REG_SET(last_call_used_reg_set, call_used_reg_set);
- else
- {
- HARD_REG_SET this_call_used_reg_set;
- get_call_reg_set_usage (curr_insn, &this_call_used_reg_set,
- call_used_reg_set);
+ function_abi call_abi = insn_callee_abi (curr_insn);
- bool flush = (! hard_reg_set_empty_p (last_call_used_reg_set)
- && ! hard_reg_set_equal_p (last_call_used_reg_set,
- this_call_used_reg_set));
+ if (last_call_abi != call_abi)
+ EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, j)
+ check_pseudos_live_through_calls (j, last_call_abi);
- EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, j)
- {
- IOR_HARD_REG_SET (lra_reg_info[j].actual_call_used_reg_set,
- this_call_used_reg_set);
- if (flush)
- check_pseudos_live_through_calls
- (j, last_call_used_reg_set);
- }
- COPY_HARD_REG_SET(last_call_used_reg_set, this_call_used_reg_set);
- }
+ last_call_abi = call_abi;
sparseset_ior (pseudos_live_through_calls,
pseudos_live_through_calls, pseudos_live);
if (cfun->has_nonlocal_label
- || find_reg_note (curr_insn, REG_SETJMP,
- NULL_RTX) != NULL_RTX)
+ || (!targetm.setjmp_preserves_nonvolatile_regs_p ()
+ && (find_reg_note (curr_insn, REG_SETJMP, NULL_RTX)
+ != NULL_RTX)))
sparseset_ior (pseudos_live_through_setjumps,
pseudos_live_through_setjumps, pseudos_live);
}
/* Increment the current program point if we must. */
- if (need_curr_point_incr)
+ if (sparseset_contains_pseudos_p (unused_set)
+ || sparseset_contains_pseudos_p (start_dying))
next_program_point (curr_point, freq);
- sparseset_clear (start_living);
+ /* If we removed the source reg from a simple register copy from the
+ live set above, then add it back now so we don't accidentally add
+ it to the start_living set below. */
+ if (ignore_reg != NULL_RTX)
+ {
+ int ignore_regno = REGNO (ignore_reg);
+ if (HARD_REGISTER_NUM_P (ignore_regno))
+ SET_HARD_REG_BIT (hard_regs_live, ignore_regno);
+ else
+ sparseset_set_bit (pseudos_live, ignore_regno);
+ }
- need_curr_point_incr = false;
+ sparseset_clear (start_living);
/* Mark each used value as live. */
for (reg = curr_id->regs; reg != NULL; reg = reg->next)
- if (reg->type == OP_IN)
+ if (reg->type != OP_OUT)
{
- need_curr_point_incr
- |= mark_regno_live (reg->regno, reg->biggest_mode,
- curr_point);
- check_pseudos_live_through_calls (reg->regno,
- last_call_used_reg_set);
+ if (reg->type == OP_IN)
+ update_pseudo_point (reg->regno, curr_point, USE_POINT);
+ mark_regno_live (reg->regno, reg->biggest_mode);
+ check_pseudos_live_through_calls (reg->regno, last_call_abi);
}
for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next)
- if (reg->type == OP_IN)
- make_hard_regno_born (reg->regno, false);
+ if (reg->type != OP_OUT)
+ make_hard_regno_live (reg->regno);
if (curr_id->arg_hard_regs != NULL)
- /* Make argument hard registers live. Don't create conflict
- of used REAL_PIC_OFFSET_TABLE_REGNUM and the pic pseudo. */
+ /* Make argument hard registers live. */
for (i = 0; (regno = curr_id->arg_hard_regs[i]) >= 0; i++)
- if (regno < FIRST_PSEUDO_REGISTER)
- make_hard_regno_born (regno, true);
+ if (HARD_REGISTER_NUM_P (regno))
+ make_hard_regno_live (regno);
sparseset_and_compl (dead_set, start_living, start_dying);
+ sparseset_clear (start_dying);
+
/* Mark early clobber outputs dead. */
for (reg = curr_id->regs; reg != NULL; reg = reg->next)
- if (reg->type == OP_OUT
+ if (reg->type != OP_IN
&& reg_early_clobber_p (reg, n_alt) && ! reg->subreg_p)
- need_curr_point_incr
- |= mark_regno_dead (reg->regno, reg->biggest_mode,
- curr_point);
+ {
+ if (reg->type == OP_OUT)
+ update_pseudo_point (reg->regno, curr_point, DEF_POINT);
+ mark_regno_dead (reg->regno, reg->biggest_mode);
+
+ /* We're done processing inputs, so make sure early clobber
+ operands that are both inputs and outputs are still live. */
+ if (reg->type == OP_INOUT)
+ mark_regno_live (reg->regno, reg->biggest_mode);
+ }
for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next)
- if (reg->type == OP_OUT
+ if (reg->type != OP_IN
&& reg_early_clobber_p (reg, n_alt) && ! reg->subreg_p)
- make_hard_regno_dead (reg->regno);
+ {
+ struct lra_insn_reg *reg2;
- if (need_curr_point_incr)
+ /* We can have early clobbered non-operand hard reg and
+ the same hard reg as an insn input. Don't make hard
+ reg dead before the insns. */
+ for (reg2 = curr_id->regs; reg2 != NULL; reg2 = reg2->next)
+ if (reg2->type != OP_OUT && reg2->regno == reg->regno)
+ break;
+ if (reg2 == NULL)
+ make_hard_regno_dead (reg->regno);
+ }
+
+ /* Increment the current program point if we must. */
+ if (sparseset_contains_pseudos_p (dead_set)
+ || sparseset_contains_pseudos_p (start_dying))
next_program_point (curr_point, freq);
/* Update notes. */
}
if (bb_has_eh_pred (bb))
+ /* Any pseudos that are currently live conflict with the eh_return
+ data registers. For liveness purposes, these registers are set
+ by artificial definitions at the start of the BB, so are not
+ actually live on entry. */
for (j = 0; ; ++j)
{
unsigned int regno = EH_RETURN_DATA_REGNO (j);
if (regno == INVALID_REGNUM)
break;
- make_hard_regno_born (regno, false);
+
+ make_hard_regno_live (regno);
+ make_hard_regno_dead (regno);
}
/* Pseudos can't go in stack regs at the start of a basic block that
- is reached by an abnormal edge. Likewise for call clobbered regs,
- because caller-save, fixup_abnormal_edges and possibly the table
- driven EH machinery are not quite ready to handle such pseudos
- live across such edges. */
+ is reached by an abnormal edge. Likewise for registers that are at
+ least partly call clobbered, because caller-save, fixup_abnormal_edges
+ and possibly the table driven EH machinery are not quite ready to
+ handle such pseudos live across such edges. */
if (bb_has_abnormal_pred (bb))
{
+ HARD_REG_SET clobbers;
+
+ CLEAR_HARD_REG_SET (clobbers);
#ifdef STACK_REGS
EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, px)
lra_reg_info[px].no_stack_p = true;
for (px = FIRST_STACK_REG; px <= LAST_STACK_REG; px++)
- make_hard_regno_born (px, false);
+ SET_HARD_REG_BIT (clobbers, px);
#endif
/* No need to record conflicts for call clobbered regs if we
have nonlocal labels around, as we don't ever try to
allocate such regs in this case. */
if (!cfun->has_nonlocal_label
&& has_abnormal_call_or_eh_pred_edge_p (bb))
- for (px = 0; px < FIRST_PSEUDO_REGISTER; px++)
- if (call_used_regs[px]
+ for (px = 0; HARD_REGISTER_NUM_P (px); px++)
+ if (eh_edge_abi.clobbers_at_least_part_of_reg_p (px)
#ifdef REAL_PIC_OFFSET_TABLE_REGNUM
/* We should create a conflict of PIC pseudo with PIC
hard reg as PIC hard reg can have a wrong value after
jump described by the abnormal edge. In this case we
- can not allocate PIC hard reg to PIC pseudo as PIC
+ cannot allocate PIC hard reg to PIC pseudo as PIC
pseudo will also have a wrong value. */
|| (px == REAL_PIC_OFFSET_TABLE_REGNUM
&& pic_offset_table_rtx != NULL_RTX
- && REGNO (pic_offset_table_rtx) >= FIRST_PSEUDO_REGISTER)
+ && !HARD_REGISTER_P (pic_offset_table_rtx))
#endif
)
- make_hard_regno_born (px, false);
+ SET_HARD_REG_BIT (clobbers, px);
+
+ clobbers &= ~hard_regs_live;
+ for (px = 0; HARD_REGISTER_NUM_P (px); px++)
+ if (TEST_HARD_REG_BIT (clobbers, px))
+ {
+ make_hard_regno_live (px);
+ make_hard_regno_dead (px);
+ }
}
bool live_change_p = false;
need_curr_point_incr = (sparseset_cardinality (pseudos_live) > 0);
EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, i)
- mark_pseudo_dead (i, curr_point);
+ {
+ update_pseudo_point (i, curr_point, DEF_POINT);
+ mark_pseudo_dead (i);
+ }
EXECUTE_IF_SET_IN_BITMAP (df_get_live_in (bb), FIRST_PSEUDO_REGISTER, j, bi)
{
if (sparseset_cardinality (pseudos_live_through_calls) == 0)
break;
if (sparseset_bit_p (pseudos_live_through_calls, j))
- check_pseudos_live_through_calls (j, last_call_used_reg_set);
+ check_pseudos_live_through_calls (j, last_call_abi);
+ }
+
+ for (i = 0; HARD_REGISTER_NUM_P (i); ++i)
+ {
+ if (!TEST_HARD_REG_BIT (hard_regs_live, i))
+ continue;
+
+ if (!TEST_HARD_REG_BIT (hard_regs_spilled_into, i))
+ continue;
+
+ if (bitmap_bit_p (df_get_live_in (bb), i))
+ continue;
+
+ live_change_p = true;
+ if (lra_dump_file)
+ fprintf (lra_dump_file,
+ " hard reg r%d is added to live at bb%d start\n", i,
+ bb->index);
+ bitmap_set_bit (df_get_live_in (bb), i);
}
if (need_curr_point_incr)
n++;
if (lra_dump_file != NULL)
fprintf (lra_dump_file, "Compressing live ranges: from %d to %d - %d%%\n",
- lra_live_max_point, n, 100 * n / lra_live_max_point);
+ lra_live_max_point, n,
+ lra_live_max_point ? 100 * n / lra_live_max_point : 100);
if (n < lra_live_max_point)
{
lra_live_max_point = n;
conservative because of recent transformation. Here in this
file we recalculate it again as it costs practically
nothing. */
- if (i >= FIRST_PSEUDO_REGISTER && regno_reg_rtx[i] != NULL_RTX)
+ if (!HARD_REGISTER_NUM_P (i) && regno_reg_rtx[i] != NULL_RTX)
lra_reg_info[i].biggest_mode = GET_MODE (regno_reg_rtx[i]);
else
lra_reg_info[i].biggest_mode = VOIDmode;
- lra_reg_info[i].call_p = false;
- if (i >= FIRST_PSEUDO_REGISTER
+ if (!HARD_REGISTER_NUM_P (i)
&& lra_reg_info[i].nrefs != 0)
{
if ((hard_regno = reg_renumber[i]) >= 0)
}
/* As we did not change CFG since LRA start we can use
DF-infrastructure solver to solve live data flow problem. */
+ for (int i = 0; HARD_REGISTER_NUM_P (i); ++i)
+ {
+ if (TEST_HARD_REG_BIT (hard_regs_spilled_into, i))
+ bitmap_clear_bit (&all_hard_regs_bitmap, i);
+ }
df_simple_dataflow
(DF_BACKWARD, NULL, live_con_fun_0, live_con_fun_n,
live_trans_fun, &all_blocks,
projects / gcc.git / blobdiff