/* Compute register class preferences for pseudo-registers.
Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1996
- 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
+ 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
Free Software Foundation, Inc.
This file is part of GCC.
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. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
/* This file contains two passes of the compiler: reg_scan and reg_class.
#include "output.h"
#include "ggc.h"
#include "timevar.h"
+#include "hashtab.h"
+#include "target.h"
static void init_reg_sets_1 (void);
static void init_reg_autoinc (void);
/* If we have auto-increment or auto-decrement and we can have secondary
reloads, we are not allowed to use classes requiring secondary
reloads for pseudos auto-incremented since reload can't handle it. */
-
-#ifdef AUTO_INC_DEC
-#if defined(SECONDARY_INPUT_RELOAD_CLASS) || defined(SECONDARY_OUTPUT_RELOAD_CLASS)
+/* We leave it to target hooks to decide if we have secondary reloads, so
+ assume that we might have them. */
+#if defined(AUTO_INC_DEC) /* */
#define FORBIDDEN_INC_DEC_CLASSES
#endif
-#endif
\f
/* Register tables used by many passes. */
/* For each reg class, table listing all the containing classes. */
-enum reg_class reg_class_superclasses[N_REG_CLASSES][N_REG_CLASSES];
+static enum reg_class reg_class_superclasses[N_REG_CLASSES][N_REG_CLASSES];
/* For each reg class, table listing all the classes contained in it. */
-enum reg_class reg_class_subclasses[N_REG_CLASSES][N_REG_CLASSES];
+static enum reg_class reg_class_subclasses[N_REG_CLASSES][N_REG_CLASSES];
/* For each pair of reg classes,
a largest reg class contained in their union. */
const char * reg_names[] = REGISTER_NAMES;
+/* Array containing all of the register class names. */
+
+const char * reg_class_names[] = REG_CLASS_NAMES;
+
/* For each hard register, the widest mode object that it can contain.
This will be a MODE_INT mode if the register can hold integers. Otherwise
it will be a MODE_FLOAT or a MODE_CC mode, whichever is valid for the
#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];
memcpy (call_used_regs, initial_call_used_regs, sizeof call_used_regs);
memset (global_regs, 0, sizeof global_regs);
- /* Do any additional initialization regsets may need. */
- INIT_ONCE_REG_SET ();
-
#ifdef REG_ALLOC_ORDER
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
inv_reg_alloc_order[reg_alloc_order[i]] = i;
void
init_fake_stack_mems (void)
{
-#ifdef HAVE_SECONDARY_RELOADS
{
int i;
for (i = 0; i < MAX_MACHINE_MODE; i++)
top_of_stack[i] = gen_rtx_MEM (i, stack_pointer_rtx);
}
-#endif
}
-#ifdef HAVE_SECONDARY_RELOADS
/* Compute extra cost of moving registers to/from memory due to reloads.
Only needed if secondary reloads are required for memory moves. */
rtx mem ATTRIBUTE_UNUSED = top_of_stack[(int) mode];
- if (in)
- {
-#ifdef SECONDARY_INPUT_RELOAD_CLASS
- altclass = SECONDARY_INPUT_RELOAD_CLASS (class, mode, mem);
-#else
- altclass = NO_REGS;
-#endif
- }
- else
- {
-#ifdef SECONDARY_OUTPUT_RELOAD_CLASS
- altclass = SECONDARY_OUTPUT_RELOAD_CLASS (class, mode, mem);
-#else
- altclass = NO_REGS;
-#endif
- }
+ altclass = secondary_reload_class (in ? 1 : 0, class, mode, mem);
if (altclass == NO_REGS)
return 0;
secondary reload. */
return memory_move_secondary_cost (mode, altclass, in) + partial_cost;
}
-#endif
/* Return a machine mode that is legitimate for hard reg REGNO and large
enough to save nregs. If we can't find one, return VOIDmode.
}
else
{
- warning ("unknown register name: %s", name);
+ warning (0, "unknown register name: %s", name);
}
}
if (global_regs[i])
{
- warning ("register used for two global register variables");
+ warning (0, "register used for two global register variables");
return;
}
if (call_used_regs[i] && ! fixed_regs[i])
- warning ("call-clobbered register used for global register variable");
+ warning (0, "call-clobbered register used for global register variable");
global_regs[i] = 1;
static void record_reg_classes (int, int, rtx *, enum machine_mode *,
const char **, rtx, struct costs *,
struct reg_pref *);
-static int copy_cost (rtx, enum machine_mode, enum reg_class, int);
+static int copy_cost (rtx, enum machine_mode, enum reg_class, int,
+ secondary_reload_info *);
static void record_address_regs (rtx, enum reg_class, int);
#ifdef FORBIDDEN_INC_DEC_CLASSES
static int auto_inc_dec_reg_p (rtx, enum machine_mode);
static void
dump_regclass (FILE *dump)
{
- static const char *const reg_class_names[] = REG_CLASS_NAMES;
int i;
for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
{
m = (enum machine_mode) ((int) m + 1))
if (HARD_REGNO_MODE_OK (j, m))
{
+ enum reg_class base_class = MODE_BASE_REG_CLASS (VOIDmode);
+
PUT_MODE (r, m);
/* If a register is not directly suitable for an
requires secondary reloads, disallow its class from
being used in such addresses. */
- if ((0
-#ifdef SECONDARY_RELOAD_CLASS
- || (SECONDARY_RELOAD_CLASS (MODE_BASE_REG_CLASS (VOIDmode), m, r)
- != NO_REGS)
-#else
-#ifdef SECONDARY_INPUT_RELOAD_CLASS
- || (SECONDARY_INPUT_RELOAD_CLASS (MODE_BASE_REG_CLASS (VOIDmode), m, r)
- != NO_REGS)
-#endif
-#ifdef SECONDARY_OUTPUT_RELOAD_CLASS
- || (SECONDARY_OUTPUT_RELOAD_CLASS (MODE_BASE_REG_CLASS (VOIDmode), m, r)
- != NO_REGS)
-#endif
-#endif
- )
+ if ((secondary_reload_class (1, base_class, m, r)
+ || secondary_reload_class (1, base_class, m, r))
&& ! auto_inc_dec_reg_p (r, m))
forbidden_inc_dec_class[i] = 1;
}
&& (reg_pref[i].prefclass != (int) best
|| reg_pref[i].altclass != (int) alt))
{
- static const char *const reg_class_names[] = REG_CLASS_NAMES;
fprintf (dump, " Register %i", i);
if (alt == ALL_REGS || best == ALL_REGS)
fprintf (dump, " pref %s\n", reg_class_names[(int) best]);
operand to the register used for the other operand. */
else if (classes[j] != NO_REGS)
- alt_cost += copy_cost (op, mode, classes[j], 1), win = 1;
+ {
+ alt_cost += copy_cost (op, mode, classes[j], 1, NULL);
+ win = 1;
+ }
}
else if (!REG_P (ops[j])
|| REGNO (ops[j]) < FIRST_PSEUDO_REGISTER)
operand. */
else
- alt_cost += copy_cost (ops[j], mode, classes[j], 1);
+ alt_cost += copy_cost (ops[j], mode, classes[j], 1, NULL);
}
else
{
win = address_operand (op, GET_MODE (op));
/* We know this operand is an address, so we want it to be
allocated to a register that can be the base of an
- address, ie BASE_REG_CLASS. */
+ address, i.e. BASE_REG_CLASS. */
classes[i]
= reg_class_subunion[(int) classes[i]]
[(int) MODE_BASE_REG_CLASS (VOIDmode)];
win = 1;
/* We know this operand is an address, so we want it to
be allocated to a register that can be the base of an
- address, ie BASE_REG_CLASS. */
+ address, i.e. BASE_REG_CLASS. */
classes[i]
= reg_class_subunion[(int) classes[i]]
[(int) MODE_BASE_REG_CLASS (VOIDmode)];
else if (classes[i] != NO_REGS)
{
if (recog_data.operand_type[i] != OP_OUT)
- alt_cost += copy_cost (op, mode, classes[i], 1);
+ alt_cost += copy_cost (op, mode, classes[i], 1, NULL);
if (recog_data.operand_type[i] != OP_IN)
- alt_cost += copy_cost (op, mode, classes[i], 0);
+ alt_cost += copy_cost (op, mode, classes[i], 0, NULL);
}
/* The only other way this alternative can be used is if this is a
X must not be a pseudo. */
static int
-copy_cost (rtx x, enum machine_mode mode ATTRIBUTE_UNUSED,
- enum reg_class class, int to_p ATTRIBUTE_UNUSED)
+copy_cost (rtx x, enum machine_mode mode, enum reg_class class, int to_p,
+ secondary_reload_info *prev_sri)
{
-#ifdef HAVE_SECONDARY_RELOADS
enum reg_class secondary_class = NO_REGS;
-#endif
+ secondary_reload_info sri;
/* If X is a SCRATCH, there is actually nothing to move since we are
assuming optimal allocation. */
/* Get the class we will actually use for a reload. */
class = PREFERRED_RELOAD_CLASS (x, class);
-#ifdef HAVE_SECONDARY_RELOADS
- /* If we need a secondary reload (we assume here that we are using
- the secondary reload as an intermediate, not a scratch register), the
+ /* If we need a secondary reload for an intermediate, the
cost is that to load the input into the intermediate register, then
- to copy them. We use a special value of TO_P to avoid recursion. */
-
-#ifdef SECONDARY_INPUT_RELOAD_CLASS
- if (to_p == 1)
- secondary_class = SECONDARY_INPUT_RELOAD_CLASS (class, mode, x);
-#endif
+ to copy it. */
-#ifdef SECONDARY_OUTPUT_RELOAD_CLASS
- if (! to_p)
- secondary_class = SECONDARY_OUTPUT_RELOAD_CLASS (class, mode, x);
-#endif
+ sri.prev_sri = prev_sri;
+ sri.extra_cost = 0;
+ secondary_class = targetm.secondary_reload (to_p, x, class, mode, &sri);
if (secondary_class != NO_REGS)
return (move_cost[mode][(int) secondary_class][(int) class]
- + copy_cost (x, mode, secondary_class, 2));
-#endif /* HAVE_SECONDARY_RELOADS */
+ + sri.extra_cost
+ + copy_cost (x, mode, secondary_class, to_p, &sri));
/* For memory, use the memory move cost, for (hard) registers, use the
cost to move between the register classes, and use 2 for everything
else (constants). */
if (MEM_P (x) || class == NO_REGS)
- return MEMORY_MOVE_COST (mode, class, to_p);
+ return sri.extra_cost + MEMORY_MOVE_COST (mode, class, to_p);
else if (REG_P (x))
- return move_cost[mode][(int) REGNO_REG_CLASS (REGNO (x))][(int) class];
+ return (sri.extra_cost
+ + move_cost[mode][(int) REGNO_REG_CLASS (REGNO (x))][(int) class]);
else
/* If this is a constant, we may eventually want to call rtx_cost here. */
- return COSTS_N_INSNS (1);
+ return sri.extra_cost + COSTS_N_INSNS (1);
}
\f
/* Record the pseudo registers we must reload into hard registers
record_address_regs (arg0, INDEX_REG_CLASS, scale);
/* If both operands are registers but one is already a hard register
- of index or base class, give the other the class that the hard
- register is not. */
+ of index or reg-base class, give the other the class that the
+ hard register is not. */
-#ifdef REG_OK_FOR_BASE_P
else if (code0 == REG && code1 == REG
&& REGNO (arg0) < FIRST_PSEUDO_REGISTER
- && (REG_OK_FOR_BASE_P (arg0) || REG_OK_FOR_INDEX_P (arg0)))
+ && (REG_MODE_OK_FOR_REG_BASE_P (arg0, VOIDmode)
+ || REG_OK_FOR_INDEX_P (arg0)))
record_address_regs (arg1,
- REG_OK_FOR_BASE_P (arg0)
- ? INDEX_REG_CLASS : MODE_BASE_REG_CLASS (VOIDmode),
+ REG_MODE_OK_FOR_REG_BASE_P (arg0, VOIDmode)
+ ? INDEX_REG_CLASS
+ : MODE_BASE_REG_REG_CLASS (VOIDmode),
scale);
else if (code0 == REG && code1 == REG
&& REGNO (arg1) < FIRST_PSEUDO_REGISTER
- && (REG_OK_FOR_BASE_P (arg1) || REG_OK_FOR_INDEX_P (arg1)))
+ && (REG_MODE_OK_FOR_REG_BASE_P (arg1, VOIDmode)
+ || REG_OK_FOR_INDEX_P (arg1)))
record_address_regs (arg0,
- REG_OK_FOR_BASE_P (arg1)
- ? INDEX_REG_CLASS : MODE_BASE_REG_CLASS (VOIDmode),
+ REG_MODE_OK_FOR_REG_BASE_P (arg1, VOIDmode)
+ ? INDEX_REG_CLASS
+ : MODE_BASE_REG_REG_CLASS (VOIDmode),
scale);
-#endif
/* If one operand is known to be a pointer, it must be the base
with the other operand the index. Likewise if the other operand
else if ((code0 == REG && REG_POINTER (arg0))
|| code1 == MULT)
{
- record_address_regs (arg0, MODE_BASE_REG_CLASS (VOIDmode), scale);
+ record_address_regs (arg0, MODE_BASE_REG_REG_CLASS (VOIDmode),
+ scale);
record_address_regs (arg1, INDEX_REG_CLASS, scale);
}
else if ((code1 == REG && REG_POINTER (arg1))
|| code0 == MULT)
{
record_address_regs (arg0, INDEX_REG_CLASS, scale);
- record_address_regs (arg1, MODE_BASE_REG_CLASS (VOIDmode), scale);
+ record_address_regs (arg1, MODE_BASE_REG_REG_CLASS (VOIDmode),
+ scale);
}
/* Otherwise, count equal chances that each might be a base
else
{
- record_address_regs (arg0, MODE_BASE_REG_CLASS (VOIDmode),
+ record_address_regs (arg0, MODE_BASE_REG_REG_CLASS (VOIDmode),
scale / 2);
record_address_regs (arg0, INDEX_REG_CLASS, scale / 2);
- record_address_regs (arg1, MODE_BASE_REG_CLASS (VOIDmode),
+ record_address_regs (arg1, MODE_BASE_REG_REG_CLASS (VOIDmode),
scale / 2);
record_address_regs (arg1, INDEX_REG_CLASS, scale / 2);
}
reg_pref_buffer = xmalloc (regno_allocated
* sizeof (struct reg_pref));
}
-
else
{
VARRAY_GROW (reg_n_info, regno_allocated);
if (renumber_p)
reg_renumber = renumber;
-
- /* Tell the regset code about the new number of registers. */
- MAX_REGNO_REG_SET (num_regs, new_p, renumber_p);
}
/* Free up the space allocated by allocate_reg_info. */
static int max_set_parallel;
void
-reg_scan (rtx f, unsigned int nregs, int repeat ATTRIBUTE_UNUSED)
+reg_scan (rtx f, unsigned int nregs)
{
rtx insn;
if (regno >= min_regno)
{
- REGNO_LAST_NOTE_UID (regno) = INSN_UID (insn);
if (!note_flag)
REGNO_LAST_UID (regno) = INSN_UID (insn);
if (REGNO_FIRST_UID (regno) == 0)
return 0;
}
-/* Release any memory allocated by register sets. */
+#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
-regset_release_memory (void)
+init_subregs_of_mode (void)
{
- bitmap_release_memory ();
+ 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);
}
-#ifdef CANNOT_CHANGE_MODE_CLASS
/* Set bits in *USED which correspond to registers which can't change
their mode from FROM to any mode in which REGNO was encountered. */
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
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;
-
- 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;
+ struct subregs_of_mode_node dummy, *node;
+ enum machine_mode to;
+ unsigned char mask;
+
+ 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 */
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