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Replace several arrays with a struct of arrays. 

2004-05-12  Paolo Bonzini  <bonzini@gnu.org>

	Replace several arrays with a struct of arrays.
        * combine.c (struct reg_stat): New.
        (init_reg_last_arrays): Renamed to...
        (init_reg_last): ...this.  Callers adjusted.
        (reg_stat): New.
        (combine_instructions): Allocate it and use it.
        (reg_last_death, reg_last_set, reg_last_set_value,
        reg_last_set_label, reg_last_set_table_tick,
        reg_last_set_invalid, reg_nonzero_bits, reg_sign_bit_copies,
        reg_last_set_mode, reg_last_set_nonzero_bits,
        reg_last_set_sign_bit_copies): Replace throughout
        with items of reg_stat.

From-SVN: r81740
This commit is contained in:
Paolo Bonzini 2004-05-12 08:32:00 +00:00 committed by Paolo Bonzini
parent f5657d6742
commit 5eaad4813d
2 changed files with 214 additions and 225 deletions
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15
gcc/ChangeLog
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@ -1,3 +1,18 @@
2004-05-12 Paolo Bonzini <bonzini@gnu.org>
Replace several arrays with a struct of arrays.
* combine.c (struct reg_stat): New.
(init_reg_last_arrays): Renamed to...
(init_reg_last): ...this. Callers adjusted.
(reg_stat): New.
(combine_instructions): Allocate it and use it.
(reg_last_death, reg_last_set, reg_last_set_value,
reg_last_set_label, reg_last_set_table_tick,
reg_last_set_invalid, reg_nonzero_bits, reg_sign_bit_copies,
reg_last_set_mode, reg_last_set_nonzero_bits,
reg_last_set_sign_bit_copies): Replace throughout
with items of reg_stat.
2004-05-11 Kaz Kojima <kkojima@gcc.gnu.org>
PR optimization/15100

424
gcc/combine.c
View File

@ -143,13 +143,103 @@ static int max_uid_cuid;
static unsigned int combine_max_regno;
/* Record last point of death of (hard or pseudo) register n. */
struct reg_stat {
/* Record last point of death of (hard or pseudo) register n. */
rtx last_death;
static rtx *reg_last_death;
/* Record last point of modification of (hard or pseudo) register n. */
rtx last_set;
/* Record last point of modification of (hard or pseudo) register n. */
/* The next group of fields allows the recording of the last value assigned
to (hard or pseudo) register n. We use this information to see if an
operation being processed is redundant given a prior operation performed
on the register. For example, an `and' with a constant is redundant if
all the zero bits are already known to be turned off.
static rtx *reg_last_set;
We use an approach similar to that used by cse, but change it in the
following ways:
(1) We do not want to reinitialize at each label.
(2) It is useful, but not critical, to know the actual value assigned
to a register. Often just its form is helpful.
Therefore, we maintain the following fields:
last_set_value the last value assigned
last_set_label records the value of label_tick when the
register was assigned
last_set_table_tick records the value of label_tick when a
value using the register is assigned
last_set_invalid set to nonzero when it is not valid
to use the value of this register in some
register's value
To understand the usage of these tables, it is important to understand
the distinction between the value in last_set_value being valid and
the register being validly contained in some other expression in the
table.
(The next two parameters are out of date).
reg_stat[i].last_set_value is valid if it is nonzero, and either
reg_n_sets[i] is 1 or reg_stat[i].last_set_label == label_tick.
Register I may validly appear in any expression returned for the value
of another register if reg_n_sets[i] is 1. It may also appear in the
value for register J if reg_stat[j].last_set_invalid is zero, or
reg_stat[i].last_set_label < reg_stat[j].last_set_label.
If an expression is found in the table containing a register which may
not validly appear in an expression, the register is replaced by
something that won't match, (clobber (const_int 0)). */
/* Record last value assigned to (hard or pseudo) register n. */
rtx last_set_value;
/* Record the value of label_tick when an expression involving register n
is placed in last_set_value. */
int last_set_table_tick;
/* Record the value of label_tick when the value for register n is placed in
last_set_value. */
int last_set_label;
/* These fields are maintained in parallel with last_set_value and are
used to store the mode in which the register was last set, te bits
that were known to be zero when it was last set, and the number of
sign bits copies it was known to have when it was last set. */
unsigned HOST_WIDE_INT last_set_nonzero_bits;
char last_set_sign_bit_copies;
ENUM_BITFIELD(machine_mode) last_set_mode : 8;
/* Set nonzero if references to register n in expressions should not be
used. last_set_invalid is set nonzero when this register is being
assigned to and last_set_table_tick == label_tick. */
char last_set_invalid;
/* Some registers that are set more than once and used in more than one
basic block are nevertheless always set in similar ways. For example,
a QImode register may be loaded from memory in two places on a machine
where byte loads zero extend.
We record in the following fields if a register has some leading bits
that are always equal to the sign bit, and what we know about the
nonzero bits of a register, specifically which bits are known to be
zero.
If an entry is zero, it means that we don't know anything special. */
unsigned char sign_bit_copies;
unsigned HOST_WIDE_INT nonzero_bits;
};
static struct reg_stat *reg_stat;
/* Record the cuid of the last insn that invalidated memory
(anything that writes memory, and subroutine calls, but not pushes). */
@ -197,110 +287,23 @@ static basic_block this_basic_block;
those blocks as starting points. */
static sbitmap refresh_blocks;
/* The next group of arrays allows the recording of the last value assigned
to (hard or pseudo) register n. We use this information to see if an
operation being processed is redundant given a prior operation performed
on the register. For example, an `and' with a constant is redundant if
all the zero bits are already known to be turned off.
We use an approach similar to that used by cse, but change it in the
following ways:
(1) We do not want to reinitialize at each label.
(2) It is useful, but not critical, to know the actual value assigned
to a register. Often just its form is helpful.
Therefore, we maintain the following arrays:
reg_last_set_value the last value assigned
reg_last_set_label records the value of label_tick when the
register was assigned
reg_last_set_table_tick records the value of label_tick when a
value using the register is assigned
reg_last_set_invalid set to nonzero when it is not valid
to use the value of this register in some
register's value
To understand the usage of these tables, it is important to understand
the distinction between the value in reg_last_set_value being valid
and the register being validly contained in some other expression in the
table.
Entry I in reg_last_set_value is valid if it is nonzero, and either
reg_n_sets[i] is 1 or reg_last_set_label[i] == label_tick.
Register I may validly appear in any expression returned for the value
of another register if reg_n_sets[i] is 1. It may also appear in the
value for register J if reg_last_set_label[i] < reg_last_set_label[j] or
reg_last_set_invalid[j] is zero.
If an expression is found in the table containing a register which may
not validly appear in an expression, the register is replaced by
something that won't match, (clobber (const_int 0)).
reg_last_set_invalid[i] is set nonzero when register I is being assigned
to and reg_last_set_table_tick[i] == label_tick. */
/* Record last value assigned to (hard or pseudo) register n. */
static rtx *reg_last_set_value;
/* Record the value of label_tick when the value for register n is placed in
reg_last_set_value[n]. */
static int *reg_last_set_label;
/* Record the value of label_tick when an expression involving register n
is placed in reg_last_set_value. */
static int *reg_last_set_table_tick;
/* Set nonzero if references to register n in expressions should not be
used. */
static char *reg_last_set_invalid;
/* Incremented for each label. */
static int label_tick;
/* Some registers that are set more than once and used in more than one
basic block are nevertheless always set in similar ways. For example,
a QImode register may be loaded from memory in two places on a machine
where byte loads zero extend.
We record in the following array what we know about the nonzero
bits of a register, specifically which bits are known to be zero.
If an entry is zero, it means that we don't know anything special. */
static unsigned HOST_WIDE_INT *reg_nonzero_bits;
/* Mode used to compute significance in reg_nonzero_bits. It is the largest
integer mode that can fit in HOST_BITS_PER_WIDE_INT. */
/* Mode used to compute significance in reg_stat[].nonzero_bits. It is the
largest integer mode that can fit in HOST_BITS_PER_WIDE_INT. */
static enum machine_mode nonzero_bits_mode;
/* Nonzero if we know that a register has some leading bits that are always
equal to the sign bit. */
static unsigned char *reg_sign_bit_copies;
/* Nonzero when reg_nonzero_bits and reg_sign_bit_copies can be safely used.
It is zero while computing them and after combine has completed. This
former test prevents propagating values based on previously set values,
which can be incorrect if a variable is modified in a loop. */
/* Nonzero when reg_stat[].nonzero_bits and reg_stat[].sign_bit_copies can
be safely used. It is zero while computing them and after combine has
completed. This former test prevents propagating values based on
previously set values, which can be incorrect if a variable is modified
in a loop. */
static int nonzero_sign_valid;
/* These arrays are maintained in parallel with reg_last_set_value
and are used to store the mode in which the register was last set,
the bits that were known to be zero when it was last set, and the
number of sign bits copies it was known to have when it was last set. */
static enum machine_mode *reg_last_set_mode;
static unsigned HOST_WIDE_INT *reg_last_set_nonzero_bits;
static char *reg_last_set_sign_bit_copies;
/* Record one modification to rtl structure
to be undone by storing old_contents into *where.
@ -336,7 +339,7 @@ static int n_occurrences;
static void do_SUBST (rtx *, rtx);
static void do_SUBST_INT (int *, int);
static void init_reg_last_arrays (void);
static void init_reg_last (void);
static void setup_incoming_promotions (void);
static void set_nonzero_bits_and_sign_copies (rtx, rtx, void *);
static int cant_combine_insn_p (rtx);
@ -523,20 +526,7 @@ combine_instructions (rtx f, unsigned int nregs)
See comments in gen_lowpart_for_combine. */
gen_lowpart = gen_lowpart_for_combine;
reg_nonzero_bits = xcalloc (nregs, sizeof (unsigned HOST_WIDE_INT));
reg_sign_bit_copies = xcalloc (nregs, sizeof (unsigned char));
reg_last_death = xmalloc (nregs * sizeof (rtx));
reg_last_set = xmalloc (nregs * sizeof (rtx));
reg_last_set_value = xmalloc (nregs * sizeof (rtx));
reg_last_set_table_tick = xmalloc (nregs * sizeof (int));
reg_last_set_label = xmalloc (nregs * sizeof (int));
reg_last_set_invalid = xmalloc (nregs * sizeof (char));
reg_last_set_mode = xmalloc (nregs * sizeof (enum machine_mode));
reg_last_set_nonzero_bits = xmalloc (nregs * sizeof (HOST_WIDE_INT));
reg_last_set_sign_bit_copies = xmalloc (nregs * sizeof (char));
init_reg_last_arrays ();
reg_stat = xcalloc (nregs, sizeof (struct reg_stat));
init_recog_no_volatile ();
@ -551,8 +541,8 @@ combine_instructions (rtx f, unsigned int nregs)
nonzero_bits_mode = mode_for_size (HOST_BITS_PER_WIDE_INT, MODE_INT, 0);
/* Don't use reg_nonzero_bits when computing it. This can cause problems
when, for example, we have j <<= 1 in a loop. */
/* Don't use reg_stat[].nonzero_bits when computing it. This can cause
problems when, for example, we have j <<= 1 in a loop. */
nonzero_sign_valid = 0;
@ -605,7 +595,7 @@ combine_instructions (rtx f, unsigned int nregs)
label_tick = 1;
last_call_cuid = 0;
mem_last_set = 0;
init_reg_last_arrays ();
init_reg_last ();
setup_incoming_promotions ();
FOR_EACH_BB (this_basic_block)
@ -768,17 +758,7 @@ combine_instructions (rtx f, unsigned int nregs)
/* Clean up. */
sbitmap_free (refresh_blocks);
free (reg_nonzero_bits);
free (reg_sign_bit_copies);
free (reg_last_death);
free (reg_last_set);
free (reg_last_set_value);
free (reg_last_set_table_tick);
free (reg_last_set_label);
free (reg_last_set_invalid);
free (reg_last_set_mode);
free (reg_last_set_nonzero_bits);
free (reg_last_set_sign_bit_copies);
free (reg_stat);
free (uid_cuid);
{
@ -805,22 +785,14 @@ combine_instructions (rtx f, unsigned int nregs)
return new_direct_jump_p;
}
/* Wipe the reg_last_xxx arrays in preparation for another pass. */
/* Wipe the last_xxx fields of reg_stat in preparation for another pass. */
static void
init_reg_last_arrays (void)
init_reg_last (void)
{
unsigned int nregs = combine_max_regno;
memset (reg_last_death, 0, nregs * sizeof (rtx));
memset (reg_last_set, 0, nregs * sizeof (rtx));
memset (reg_last_set_value, 0, nregs * sizeof (rtx));
memset (reg_last_set_table_tick, 0, nregs * sizeof (int));
memset (reg_last_set_label, 0, nregs * sizeof (int));
memset (reg_last_set_invalid, 0, nregs * sizeof (char));
memset (reg_last_set_mode, 0, nregs * sizeof (enum machine_mode));
memset (reg_last_set_nonzero_bits, 0, nregs * sizeof (HOST_WIDE_INT));
memset (reg_last_set_sign_bit_copies, 0, nregs * sizeof (char));
unsigned int i;
for (i = 0; i < combine_max_regno; i++)
memset (reg_stat + i, 0, offsetof (struct reg_stat, sign_bit_copies));
}
/* Set up any promoted values for incoming argument registers. */
@ -878,8 +850,8 @@ set_nonzero_bits_and_sign_copies (rtx x, rtx set,
{
if (set == 0 || GET_CODE (set) == CLOBBER)
{
reg_nonzero_bits[REGNO (x)] = GET_MODE_MASK (GET_MODE (x));
reg_sign_bit_copies[REGNO (x)] = 1;
reg_stat[REGNO (x)].nonzero_bits = GET_MODE_MASK (GET_MODE (x));
reg_stat[REGNO (x)].sign_bit_copies = 1;
return;
}
@ -901,7 +873,7 @@ set_nonzero_bits_and_sign_copies (rtx x, rtx set,
#ifdef SHORT_IMMEDIATES_SIGN_EXTEND
/* If X is narrower than a word and SRC is a non-negative
constant that would appear negative in the mode of X,
sign-extend it for use in reg_nonzero_bits because some
sign-extend it for use in reg_stat[].nonzero_bits because some
machines (maybe most) will actually do the sign-extension
and this is the conservative approach.
@ -920,18 +892,18 @@ set_nonzero_bits_and_sign_copies (rtx x, rtx set,
#endif
/* Don't call nonzero_bits if it cannot change anything. */
if (reg_nonzero_bits[REGNO (x)] != ~(unsigned HOST_WIDE_INT) 0)
reg_nonzero_bits[REGNO (x)]
if (reg_stat[REGNO (x)].nonzero_bits != ~(unsigned HOST_WIDE_INT) 0)
reg_stat[REGNO (x)].nonzero_bits
|= nonzero_bits (src, nonzero_bits_mode);
num = num_sign_bit_copies (SET_SRC (set), GET_MODE (x));
if (reg_sign_bit_copies[REGNO (x)] == 0
|| reg_sign_bit_copies[REGNO (x)] > num)
reg_sign_bit_copies[REGNO (x)] = num;
if (reg_stat[REGNO (x)].sign_bit_copies == 0
|| reg_stat[REGNO (x)].sign_bit_copies > num)
reg_stat[REGNO (x)].sign_bit_copies = num;
}
else
{
reg_nonzero_bits[REGNO (x)] = GET_MODE_MASK (GET_MODE (x));
reg_sign_bit_copies[REGNO (x)] = 1;
reg_stat[REGNO (x)].nonzero_bits = GET_MODE_MASK (GET_MODE (x));
reg_stat[REGNO (x)].sign_bit_copies = 1;
}
}
}
@ -1101,7 +1073,7 @@ can_combine_p (rtx insn, rtx i3, rtx pred ATTRIBUTE_UNUSED, rtx succ,
does not use any registers whose values alter in between. However,
If the insns are adjacent, a use can't cross a set even though we
think it might (this can happen for a sequence of insns each setting
the same destination; reg_last_set of that register might point to
the same destination; last_set of that register might point to
a NOTE). If INSN has a REG_EQUIV note, the register is always
equivalent to the memory so the substitution is valid even if there
are intervening stores. Also, don't move a volatile asm or
@ -2331,18 +2303,18 @@ try_combine (rtx i3, rtx i2, rtx i1, int *new_direct_jump_p)
&& GET_CODE (SET_DEST (XVECEXP (newpat, 0, 1))) != STRICT_LOW_PART
&& ! (temp = SET_DEST (XVECEXP (newpat, 0, 1)),
(GET_CODE (temp) == REG
&& reg_nonzero_bits[REGNO (temp)] != 0
&& reg_stat[REGNO (temp)].nonzero_bits != 0
&& GET_MODE_BITSIZE (GET_MODE (temp)) < BITS_PER_WORD
&& GET_MODE_BITSIZE (GET_MODE (temp)) < HOST_BITS_PER_INT
&& (reg_nonzero_bits[REGNO (temp)]
&& (reg_stat[REGNO (temp)].nonzero_bits
!= GET_MODE_MASK (word_mode))))
&& ! (GET_CODE (SET_DEST (XVECEXP (newpat, 0, 1))) == SUBREG
&& (temp = SUBREG_REG (SET_DEST (XVECEXP (newpat, 0, 1))),
(GET_CODE (temp) == REG
&& reg_nonzero_bits[REGNO (temp)] != 0
&& reg_stat[REGNO (temp)].nonzero_bits != 0
&& GET_MODE_BITSIZE (GET_MODE (temp)) < BITS_PER_WORD
&& GET_MODE_BITSIZE (GET_MODE (temp)) < HOST_BITS_PER_INT
&& (reg_nonzero_bits[REGNO (temp)]
&& (reg_stat[REGNO (temp)].nonzero_bits
!= GET_MODE_MASK (word_mode)))))
&& ! reg_overlap_mentioned_p (SET_DEST (XVECEXP (newpat, 0, 1)),
SET_SRC (XVECEXP (newpat, 0, 1)))
@ -2783,9 +2755,10 @@ try_combine (rtx i3, rtx i2, rtx i1, int *new_direct_jump_p)
REG_N_SETS (regno)--;
}
/* Update reg_nonzero_bits et al for any changes that may have been made
to this insn. The order of set_nonzero_bits_and_sign_copies() is
important. Because newi2pat can affect nonzero_bits of newpat */
/* Update reg_stat[].nonzero_bits et al for any changes that may have
been made to this insn. The order of
set_nonzero_bits_and_sign_copies() is important. Because newi2pat
can affect nonzero_bits of newpat */
if (newi2pat)
note_stores (newi2pat, set_nonzero_bits_and_sign_copies, NULL);
note_stores (newpat, set_nonzero_bits_and_sign_copies, NULL);
@ -8171,17 +8144,17 @@ nonzero_bits1 (rtx x, enum machine_mode mode, rtx known_x,
value. Otherwise, use the previously-computed global nonzero bits
for this register. */
if (reg_last_set_value[REGNO (x)] != 0
&& (reg_last_set_mode[REGNO (x)] == mode
|| (GET_MODE_CLASS (reg_last_set_mode[REGNO (x)]) == MODE_INT
if (reg_stat[REGNO (x)].last_set_value != 0
&& (reg_stat[REGNO (x)].last_set_mode == mode
|| (GET_MODE_CLASS (reg_stat[REGNO (x)].last_set_mode) == MODE_INT
&& GET_MODE_CLASS (mode) == MODE_INT))
&& (reg_last_set_label[REGNO (x)] == label_tick
&& (reg_stat[REGNO (x)].last_set_label == label_tick
|| (REGNO (x) >= FIRST_PSEUDO_REGISTER
&& REG_N_SETS (REGNO (x)) == 1
&& ! REGNO_REG_SET_P (ENTRY_BLOCK_PTR->next_bb->global_live_at_start,
REGNO (x))))
&& INSN_CUID (reg_last_set[REGNO (x)]) < subst_low_cuid)
return reg_last_set_nonzero_bits[REGNO (x)] & nonzero;
&& INSN_CUID (reg_stat[REGNO (x)].last_set) < subst_low_cuid)
return reg_stat[REGNO (x)].last_set_nonzero_bits & nonzero;
tem = get_last_value (x);
@ -8190,8 +8163,8 @@ nonzero_bits1 (rtx x, enum machine_mode mode, rtx known_x,
#ifdef SHORT_IMMEDIATES_SIGN_EXTEND
/* If X is narrower than MODE and TEM is a non-negative
constant that would appear negative in the mode of X,
sign-extend it for use in reg_nonzero_bits because some
machines (maybe most) will actually do the sign-extension
sign-extend it for use in reg_stat[].nonzero_bits because
some machines (maybe most) will actually do the sign-extension
and this is the conservative approach.
??? For 2.5, try to tighten up the MD files in this regard
@ -8209,9 +8182,9 @@ nonzero_bits1 (rtx x, enum machine_mode mode, rtx known_x,
#endif
return nonzero_bits_with_known (tem, mode) & nonzero;
}
else if (nonzero_sign_valid && reg_nonzero_bits[REGNO (x)])
else if (nonzero_sign_valid && reg_stat[REGNO (x)].nonzero_bits)
{
unsigned HOST_WIDE_INT mask = reg_nonzero_bits[REGNO (x)];
unsigned HOST_WIDE_INT mask = reg_stat[REGNO (x)].nonzero_bits;
if (GET_MODE_BITSIZE (GET_MODE (x)) < mode_width)
/* We don't know anything about the upper bits. */
@ -8667,23 +8640,23 @@ num_sign_bit_copies1 (rtx x, enum machine_mode mode, rtx known_x,
return GET_MODE_BITSIZE (Pmode) - GET_MODE_BITSIZE (ptr_mode) + 1;
#endif
if (reg_last_set_value[REGNO (x)] != 0
&& reg_last_set_mode[REGNO (x)] == mode
&& (reg_last_set_label[REGNO (x)] == label_tick
if (reg_stat[REGNO (x)].last_set_value != 0
&& reg_stat[REGNO (x)].last_set_mode == mode
&& (reg_stat[REGNO (x)].last_set_label == label_tick
|| (REGNO (x) >= FIRST_PSEUDO_REGISTER
&& REG_N_SETS (REGNO (x)) == 1
&& ! REGNO_REG_SET_P (ENTRY_BLOCK_PTR->next_bb->global_live_at_start,
REGNO (x))))
&& INSN_CUID (reg_last_set[REGNO (x)]) < subst_low_cuid)
return reg_last_set_sign_bit_copies[REGNO (x)];
&& INSN_CUID (reg_stat[REGNO (x)].last_set) < subst_low_cuid)
return reg_stat[REGNO (x)].last_set_sign_bit_copies;
tem = get_last_value (x);
if (tem != 0)
return num_sign_bit_copies_with_known (tem, mode);
if (nonzero_sign_valid && reg_sign_bit_copies[REGNO (x)] != 0
if (nonzero_sign_valid && reg_stat[REGNO (x)].sign_bit_copies != 0
&& GET_MODE_BITSIZE (GET_MODE (x)) == bitwidth)
return reg_sign_bit_copies[REGNO (x)];
return reg_stat[REGNO (x)].sign_bit_copies;
break;
case MEM:
@ -11367,7 +11340,7 @@ reversed_comparison (rtx exp, enum machine_mode mode, rtx op0, rtx op1)
}
/* Utility function for following routine. Called when X is part of a value
being stored into reg_last_set_value. Sets reg_last_set_table_tick
being stored into last_set_value. Sets last_set_table_tick
for each register mentioned. Similar to mention_regs in cse.c */
static void
@ -11386,7 +11359,7 @@ update_table_tick (rtx x)
unsigned int r;
for (r = regno; r < endregno; r++)
reg_last_set_table_tick[r] = label_tick;
reg_stat[r].last_set_table_tick = label_tick;
return;
}
@ -11434,8 +11407,9 @@ update_table_tick (rtx x)
/* Record that REG is set to VALUE in insn INSN. If VALUE is zero, we
are saying that the register is clobbered and we no longer know its
value. If INSN is zero, don't update reg_last_set; this is only permitted
with VALUE also zero and is used to invalidate the register. */
value. If INSN is zero, don't update reg_stat[].last_set; this is
only permitted with VALUE also zero and is used to invalidate the
register. */
static void
record_value_for_reg (rtx reg, rtx insn, rtx value)
@ -11479,13 +11453,13 @@ record_value_for_reg (rtx reg, rtx insn, rtx value)
for (i = regno; i < endregno; i++)
{
if (insn)
reg_last_set[i] = insn;
reg_stat[i].last_set = insn;
reg_last_set_value[i] = 0;
reg_last_set_mode[i] = 0;
reg_last_set_nonzero_bits[i] = 0;
reg_last_set_sign_bit_copies[i] = 0;
reg_last_death[i] = 0;
reg_stat[i].last_set_value = 0;
reg_stat[i].last_set_mode = 0;
reg_stat[i].last_set_nonzero_bits = 0;
reg_stat[i].last_set_sign_bit_copies = 0;
reg_stat[i].last_death = 0;
}
/* Mark registers that are being referenced in this value. */
@ -11501,40 +11475,40 @@ record_value_for_reg (rtx reg, rtx insn, rtx value)
for (i = regno; i < endregno; i++)
{
reg_last_set_label[i] = label_tick;
if (value && reg_last_set_table_tick[i] == label_tick)
reg_last_set_invalid[i] = 1;
reg_stat[i].last_set_label = label_tick;
if (value && reg_stat[i].last_set_table_tick == label_tick)
reg_stat[i].last_set_invalid = 1;
else
reg_last_set_invalid[i] = 0;
reg_stat[i].last_set_invalid = 0;
}
/* The value being assigned might refer to X (like in "x++;"). In that
case, we must replace it with (clobber (const_int 0)) to prevent
infinite loops. */
if (value && ! get_last_value_validate (&value, insn,
reg_last_set_label[regno], 0))
reg_stat[regno].last_set_label, 0))
{
value = copy_rtx (value);
if (! get_last_value_validate (&value, insn,
reg_last_set_label[regno], 1))
reg_stat[regno].last_set_label, 1))
value = 0;
}
/* For the main register being modified, update the value, the mode, the
nonzero bits, and the number of sign bit copies. */
reg_last_set_value[regno] = value;
reg_stat[regno].last_set_value = value;
if (value)
{
enum machine_mode mode = GET_MODE (reg);
subst_low_cuid = INSN_CUID (insn);
reg_last_set_mode[regno] = mode;
reg_stat[regno].last_set_mode = mode;
if (GET_MODE_CLASS (mode) == MODE_INT
&& GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
mode = nonzero_bits_mode;
reg_last_set_nonzero_bits[regno] = nonzero_bits (value, mode);
reg_last_set_sign_bit_copies[regno]
reg_stat[regno].last_set_nonzero_bits = nonzero_bits (value, mode);
reg_stat[regno].last_set_sign_bit_copies
= num_sign_bit_copies (value, GET_MODE (reg));
}
}
@ -11579,11 +11553,11 @@ record_dead_and_set_regs_1 (rtx dest, rtx setter, void *data)
for the things done by INSN. This is the last thing done in processing
INSN in the combiner loop.
We update reg_last_set, reg_last_set_value, reg_last_set_mode,
reg_last_set_nonzero_bits, reg_last_set_sign_bit_copies, reg_last_death,
and also the similar information mem_last_set (which insn most recently
modified memory) and last_call_cuid (which insn was the most recent
subroutine call). */
We update reg_stat[], in particular fields last_set, last_set_value,
last_set_mode, last_set_nonzero_bits, last_set_sign_bit_copies,
last_death, and also the similar information mem_last_set (which insn
most recently modified memory) and last_call_cuid (which insn was the
most recent subroutine call). */
static void
record_dead_and_set_regs (rtx insn)
@ -11603,7 +11577,7 @@ record_dead_and_set_regs (rtx insn)
: 1);
for (i = regno; i < endregno; i++)
reg_last_death[i] = insn;
reg_stat[i].last_death = insn;
}
else if (REG_NOTE_KIND (link) == REG_INC)
record_value_for_reg (XEXP (link, 0), insn, NULL_RTX);
@ -11614,11 +11588,11 @@ record_dead_and_set_regs (rtx insn)
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (TEST_HARD_REG_BIT (regs_invalidated_by_call, i))
{
reg_last_set_value[i] = 0;
reg_last_set_mode[i] = 0;
reg_last_set_nonzero_bits[i] = 0;
reg_last_set_sign_bit_copies[i] = 0;
reg_last_death[i] = 0;
reg_stat[i].last_set_value = 0;
reg_stat[i].last_set_mode = 0;
reg_stat[i].last_set_nonzero_bits = 0;
reg_stat[i].last_set_sign_bit_copies = 0;
reg_stat[i].last_death = 0;
}
last_call_cuid = mem_last_set = INSN_CUID (insn);
@ -11666,10 +11640,10 @@ record_promoted_value (rtx insn, rtx subreg)
continue;
}
if (reg_last_set[regno] == insn)
if (reg_stat[regno].last_set == insn)
{
if (SUBREG_PROMOTED_UNSIGNED_P (subreg) > 0)
reg_last_set_nonzero_bits[regno] &= GET_MODE_MASK (mode);
reg_stat[regno].last_set_nonzero_bits &= GET_MODE_MASK (mode);
}
if (GET_CODE (SET_SRC (set)) == REG)
@ -11739,14 +11713,14 @@ get_last_value_validate (rtx *loc, rtx insn, int tick, int replace)
unsigned int j;
for (j = regno; j < endregno; j++)
if (reg_last_set_invalid[j]
if (reg_stat[j].last_set_invalid
/* If this is a pseudo-register that was only set once and not
live at the beginning of the function, it is always valid. */
|| (! (regno >= FIRST_PSEUDO_REGISTER
&& REG_N_SETS (regno) == 1
&& (! REGNO_REG_SET_P
(ENTRY_BLOCK_PTR->next_bb->global_live_at_start, regno)))
&& reg_last_set_label[j] > tick))
&& reg_stat[j].last_set_label > tick))
{
if (replace)
*loc = gen_rtx_CLOBBER (GET_MODE (x), const0_rtx);
@ -11838,7 +11812,7 @@ get_last_value (rtx x)
return 0;
regno = REGNO (x);
value = reg_last_set_value[regno];
value = reg_stat[regno].last_set_value;
/* If we don't have a value, or if it isn't for this basic block and
it's either a hard register, set more than once, or it's a live
@ -11851,7 +11825,7 @@ get_last_value (rtx x)
block. */
if (value == 0
|| (reg_last_set_label[regno] != label_tick
|| (reg_stat[regno].last_set_label != label_tick
&& (regno < FIRST_PSEUDO_REGISTER
|| REG_N_SETS (regno) != 1
|| (REGNO_REG_SET_P
@ -11860,20 +11834,20 @@ get_last_value (rtx x)
/* If the value was set in a later insn than the ones we are processing,
we can't use it even if the register was only set once. */
if (INSN_CUID (reg_last_set[regno]) >= subst_low_cuid)
if (INSN_CUID (reg_stat[regno].last_set) >= subst_low_cuid)
return 0;
/* If the value has all its registers valid, return it. */
if (get_last_value_validate (&value, reg_last_set[regno],
reg_last_set_label[regno], 0))
if (get_last_value_validate (&value, reg_stat[regno].last_set,
reg_stat[regno].last_set_label, 0))
return value;
/* Otherwise, make a copy and replace any invalid register with
(clobber (const_int 0)). If that fails for some reason, return 0. */
value = copy_rtx (value);
if (get_last_value_validate (&value, reg_last_set[regno],
reg_last_set_label[regno], 1))
if (get_last_value_validate (&value, reg_stat[regno].last_set,
reg_stat[regno].last_set_label, 1))
return value;
return 0;
@ -11902,8 +11876,8 @@ use_crosses_set_p (rtx x, int from_cuid)
return 1;
#endif
for (; regno < endreg; regno++)
if (reg_last_set[regno]
&& INSN_CUID (reg_last_set[regno]) > from_cuid)
if (reg_stat[regno].last_set
&& INSN_CUID (reg_stat[regno].last_set) > from_cuid)
return 1;
return 0;
}
@ -12163,7 +12137,7 @@ move_deaths (rtx x, rtx maybe_kill_insn, int from_cuid, rtx to_insn,
if (code == REG)
{
unsigned int regno = REGNO (x);
rtx where_dead = reg_last_death[regno];
rtx where_dead = reg_stat[regno].last_death;
rtx before_dead, after_dead;
/* Don't move the register if it gets killed in between from and to. */
@ -12190,7 +12164,7 @@ move_deaths (rtx x, rtx maybe_kill_insn, int from_cuid, rtx to_insn,
rtx note = remove_death (regno, where_dead);
/* It is possible for the call above to return 0. This can occur
when reg_last_death points to I2 or I1 that we combined with.
when last_death points to I2 or I1 that we combined with.
In that case make a new note.
We must also check for the case where X is a hard register
@ -12803,14 +12777,14 @@ distribute_notes (rtx notes, rtx from_insn, rtx i3, rtx i2)
|| reg_bitfield_target_p (XEXP (note, 0), PATTERN (place)))
{
/* Unless the register previously died in PLACE, clear
reg_last_death. [I no longer understand why this is
last_death. [I no longer understand why this is
being done.] */
if (reg_last_death[regno] != place)
reg_last_death[regno] = 0;
if (reg_stat[regno].last_death != place)
reg_stat[regno].last_death = 0;
place = 0;
}
else
reg_last_death[regno] = place;
reg_stat[regno].last_death = place;
/* If this is a death note for a hard reg that is occupying
multiple registers, ensure that we are still using all