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re PR middle-end/17503 (quadratic behaviour in invalid_mode_change_p) 

PR rtl-opt/17503
        * regclass.c (subregs_of_mode): Turn into an htab.  Make static.
        (som_hash, som_eq): New.
        (init_subregs_of_mode, record_subregs_of_mode): New.
        (cannot_change_mode_set_regs): Rewrite for htab implementation.
        (invalid_mode_change_p): Likewise.
        * combine.c (gen_lowpart_for_combine): Use record_subregs_of_mode.
        * flow.c (mark_used_regs): Likewise.
        (life_analysis): Use init_subregs_of_mode.
        * regs.h (subregs_of_mode): Remove.
        * rtl.h (init_subregs_of_mode, record_subregs_of_mode): Declare.

From-SVN: r88067
This commit is contained in:
Richard Henderson 2004-09-24 12:47:05 -07:00 committed by Richard Henderson
parent 84f7a28c9b
commit 41bf2a8b17
6 changed files with 119 additions and 52 deletions
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14
gcc/ChangeLog
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@ -1,3 +1,17 @@
2004-09-24 Richard Henderson <rth@redhat.com>
PR rtl-opt/17503
* regclass.c (subregs_of_mode): Turn into an htab. Make static.
(som_hash, som_eq): New.
(init_subregs_of_mode, record_subregs_of_mode): New.
(cannot_change_mode_set_regs): Rewrite for htab implementation.
(invalid_mode_change_p): Likewise.
* combine.c (gen_lowpart_for_combine): Use record_subregs_of_mode.
* flow.c (mark_used_regs): Likewise.
(life_analysis): Use init_subregs_of_mode.
* regs.h (subregs_of_mode): Remove.
* rtl.h (init_subregs_of_mode, record_subregs_of_mode): Declare.
2004-09-24 Andrew Pinski <pinskia@physics.uc.edu>
* tree-ssa-phiopt.c (conditional_replacement): Use the correct

9
gcc/combine.c
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@ -9327,13 +9327,8 @@ gen_lowpart_for_combine (enum machine_mode mode, rtx x)
result = gen_lowpart_common (mode, x);
#ifdef CANNOT_CHANGE_MODE_CLASS
if (result != 0
&& GET_CODE (result) == SUBREG
&& REG_P (SUBREG_REG (result))
&& REGNO (SUBREG_REG (result)) >= FIRST_PSEUDO_REGISTER)
bitmap_set_bit (&subregs_of_mode, REGNO (SUBREG_REG (result))
* MAX_MACHINE_MODE
+ GET_MODE (result));
if (result != 0 && GET_CODE (result) == SUBREG)
record_subregs_of_mode (result);
#endif
if (result)

19
gcc/flow.c
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@ -377,7 +377,7 @@ life_analysis (FILE *file, int flags)
#ifdef CANNOT_CHANGE_MODE_CLASS
if (flags & PROP_REG_INFO)
bitmap_initialize (&subregs_of_mode, 1);
init_subregs_of_mode ();
#endif
if (! optimize)
@ -3773,12 +3773,8 @@ mark_used_regs (struct propagate_block_info *pbi, rtx x, rtx cond, rtx insn)
case SUBREG:
#ifdef CANNOT_CHANGE_MODE_CLASS
if ((flags & PROP_REG_INFO)
&& REG_P (SUBREG_REG (x))
&& REGNO (SUBREG_REG (x)) >= FIRST_PSEUDO_REGISTER)
bitmap_set_bit (&subregs_of_mode, REGNO (SUBREG_REG (x))
* MAX_MACHINE_MODE
+ GET_MODE (x));
if (flags & PROP_REG_INFO)
record_subregs_of_mode (x);
#endif
/* While we're here, optimize this case. */
@ -3823,13 +3819,8 @@ mark_used_regs (struct propagate_block_info *pbi, rtx x, rtx cond, rtx insn)
|| GET_CODE (testreg) == SUBREG)
{
#ifdef CANNOT_CHANGE_MODE_CLASS
if ((flags & PROP_REG_INFO)
&& GET_CODE (testreg) == SUBREG
&& REG_P (SUBREG_REG (testreg))
&& REGNO (SUBREG_REG (testreg)) >= FIRST_PSEUDO_REGISTER)
bitmap_set_bit (&subregs_of_mode, REGNO (SUBREG_REG (testreg))
* MAX_MACHINE_MODE
+ GET_MODE (testreg));
if ((flags & PROP_REG_INFO) && GET_CODE (testreg) == SUBREG)
record_subregs_of_mode (testreg);
#endif
/* Modifying a single register in an alternate mode

125
gcc/regclass.c
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@ -45,6 +45,7 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
#include "output.h"
#include "ggc.h"
#include "timevar.h"
#include "hashtab.h"
static void init_reg_sets_1 (void);
static void init_reg_autoinc (void);
@ -235,12 +236,6 @@ static char *in_inc_dec;
#endif /* FORBIDDEN_INC_DEC_CLASSES */
#ifdef CANNOT_CHANGE_MODE_CLASS
/* All registers that have been subreged. Indexed by regno * MAX_MACHINE_MODE
+ mode. */
bitmap_head subregs_of_mode;
#endif
/* Sample MEM values for use by memory_move_secondary_cost. */
static GTY(()) rtx top_of_stack[MAX_MACHINE_MODE];
@ -2594,6 +2589,70 @@ regset_release_memory (void)
}
#ifdef CANNOT_CHANGE_MODE_CLASS
struct subregs_of_mode_node
{
unsigned int block;
unsigned char modes[MAX_MACHINE_MODE];
};
static htab_t subregs_of_mode;
static hashval_t
som_hash (const void *x)
{
const struct subregs_of_mode_node *a = x;
return a->block;
}
static int
som_eq (const void *x, const void *y)
{
const struct subregs_of_mode_node *a = x;
const struct subregs_of_mode_node *b = y;
return a->block == b->block;
}
void
init_subregs_of_mode (void)
{
if (subregs_of_mode)
htab_empty (subregs_of_mode);
else
subregs_of_mode = htab_create (100, som_hash, som_eq, free);
}
void
record_subregs_of_mode (rtx subreg)
{
struct subregs_of_mode_node dummy, *node;
enum machine_mode mode;
unsigned int regno;
void **slot;
if (!REG_P (SUBREG_REG (subreg)))
return;
regno = REGNO (SUBREG_REG (subreg));
mode = GET_MODE (subreg);
if (regno < FIRST_PSEUDO_REGISTER)
return;
dummy.block = regno & -8;
slot = htab_find_slot_with_hash (subregs_of_mode, &dummy,
dummy.block, INSERT);
node = *slot;
if (node == NULL)
{
node = xcalloc (1, sizeof (*node));
node->block = regno & -8;
*slot = node;
}
node->modes[mode] |= 1 << (regno & 7);
}
/* Set bits in *USED which correspond to registers which can't change
their mode from FROM to any mode in which REGNO was encountered. */
@ -2601,19 +2660,23 @@ void
cannot_change_mode_set_regs (HARD_REG_SET *used, enum machine_mode from,
unsigned int regno)
{
struct subregs_of_mode_node dummy, *node;
enum machine_mode to;
int n, i;
int start = regno * MAX_MACHINE_MODE;
unsigned char mask;
unsigned int i;
EXECUTE_IF_SET_IN_BITMAP (&subregs_of_mode, start, n,
if (n >= MAX_MACHINE_MODE + start)
return;
to = n - start;
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (! TEST_HARD_REG_BIT (*used, i)
&& REG_CANNOT_CHANGE_MODE_P (i, from, to))
SET_HARD_REG_BIT (*used, i);
);
dummy.block = regno & -8;
node = htab_find_with_hash (subregs_of_mode, &dummy, dummy.block);
if (node == NULL)
return;
mask = 1 << (regno & 7);
for (to = VOIDmode; to < NUM_MACHINE_MODES; to++)
if (node->modes[to] & mask)
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (!TEST_HARD_REG_BIT (*used, i)
&& REG_CANNOT_CHANGE_MODE_P (i, from, to))
SET_HARD_REG_BIT (*used, i);
}
/* Return 1 if REGNO has had an invalid mode change in CLASS from FROM
@ -2621,20 +2684,24 @@ cannot_change_mode_set_regs (HARD_REG_SET *used, enum machine_mode from,
bool
invalid_mode_change_p (unsigned int regno, enum reg_class class,
enum machine_mode from_mode)
enum machine_mode from)
{
enum machine_mode to_mode;
int n;
int start = regno * MAX_MACHINE_MODE;
struct subregs_of_mode_node dummy, *node;
enum machine_mode to;
unsigned char mask;
EXECUTE_IF_SET_IN_BITMAP (&subregs_of_mode, start, n,
if (n >= MAX_MACHINE_MODE + start)
return 0;
to_mode = n - start;
if (CANNOT_CHANGE_MODE_CLASS (from_mode, to_mode, class))
return 1;
);
return 0;
dummy.block = regno & -8;
node = htab_find_with_hash (subregs_of_mode, &dummy, dummy.block);
if (node == NULL)
return false;
mask = 1 << (regno & 7);
for (to = VOIDmode; to < NUM_MACHINE_MODES; to++)
if (node->modes[to] & mask)
if (CANNOT_CHANGE_MODE_CLASS (from, to, class))
return true;
return false;
}
#endif /* CANNOT_CHANGE_MODE_CLASS */

2
gcc/regs.h
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@ -68,8 +68,6 @@ typedef struct reg_info_def
extern varray_type reg_n_info;
extern bitmap_head subregs_of_mode;
/* Indexed by n, gives number of times (REG n) is used or set. */
#define REG_N_REFS(N) (VARRAY_REG (reg_n_info, N)->refs)

2
gcc/rtl.h
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@ -2092,6 +2092,8 @@ extern void regclass (rtx, int, FILE *);
extern void reg_scan (rtx, unsigned int, int);
extern void reg_scan_update (rtx, rtx, unsigned int);
extern void fix_register (const char *, int, int);
extern void init_subregs_of_mode (void);
extern void record_subregs_of_mode (rtx);
#ifdef HARD_CONST
extern void cannot_change_mode_set_regs (HARD_REG_SET *,
enum machine_mode, unsigned int);