/* Compute register class preferences for pseudo-registers.
- Copyright (C) 1987, 88, 91-98, 1999 Free Software Foundation, Inc.
+ Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1996
+ 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
This file is part of GNU CC.
#include "ggc.h"
#ifndef REGISTER_MOVE_COST
-#define REGISTER_MOVE_COST(x, y) 2
+#define REGISTER_MOVE_COST(m, x, y) 2
#endif
-static void init_reg_sets_1 PROTO((void));
-static void init_reg_modes PROTO((void));
+static void init_reg_sets_1 PARAMS ((void));
+static void init_reg_modes PARAMS ((void));
/* If we have auto-increment or auto-decrement and we can have secondary
reloads, we are not allowed to use classes requiring secondary
/* Table of register numbers in the order in which to try to use them. */
#ifdef REG_ALLOC_ORDER
int reg_alloc_order[FIRST_PSEUDO_REGISTER] = REG_ALLOC_ORDER;
+
+/* The inverse of reg_alloc_order. */
+int inv_reg_alloc_order[FIRST_PSEUDO_REGISTER];
#endif
/* For each reg class, a HARD_REG_SET saying which registers are in it. */
/* For each reg class, number of regs it contains. */
-int reg_class_size[N_REG_CLASSES];
+unsigned int reg_class_size[N_REG_CLASSES];
/* For each reg class, table listing all the containing classes. */
enum reg_class reg_class_superunion[N_REG_CLASSES][N_REG_CLASSES];
-/* Array containing all of the register names */
+/* Array containing all of the register names. Unless
+ DEBUG_REGISTER_NAMES is defined, use the copy in print-rtl.c. */
-const char *reg_names[] = REGISTER_NAMES;
+#ifdef DEBUG_REGISTER_NAMES
+const char * reg_names[] = REGISTER_NAMES;
+#endif
/* 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
/* Maximum cost of moving from a register in one class to a register in
another class. Based on REGISTER_MOVE_COST. */
-static int move_cost[N_REG_CLASSES][N_REG_CLASSES];
+static int move_cost[MAX_MACHINE_MODE][N_REG_CLASSES][N_REG_CLASSES];
/* Similar, but here we don't have to move if the first index is a subset
of the second so in that case the cost is zero. */
-static int may_move_in_cost[N_REG_CLASSES][N_REG_CLASSES];
+static int may_move_in_cost[MAX_MACHINE_MODE][N_REG_CLASSES][N_REG_CLASSES];
/* Similar, but here we don't have to move if the first index is a superset
of the second so in that case the cost is zero. */
-static int may_move_out_cost[N_REG_CLASSES][N_REG_CLASSES];
+static int may_move_out_cost[MAX_MACHINE_MODE][N_REG_CLASSES][N_REG_CLASSES];
#ifdef FORBIDDEN_INC_DEC_CLASSES
#endif /* FORBIDDEN_INC_DEC_CLASSES */
+#ifdef CLASS_CANNOT_CHANGE_MODE
+
+/* These are the classes containing only registers that can be used in
+ a SUBREG expression that changes the mode of the register in some
+ way that is illegal. */
+
+static int class_can_change_mode[N_REG_CLASSES];
+
+/* Registers, including pseudos, which change modes in some way that
+ is illegal. */
+
+static regset reg_changes_mode;
+
+#endif /* CLASS_CANNOT_CHANGE_MODE */
+
#ifdef HAVE_SECONDARY_RELOADS
/* Sample MEM values for use by memory_move_secondary_cost. */
static struct reg_info_data *reg_info_head;
+/* No more global register variables may be declared; true once
+ regclass has been initialized. */
+
+static int no_global_reg_vars = 0;
+
/* Function called only once to initialize the above data on reg usage.
Once this is done, various switches may override. */
SET_HARD_REG_BIT (reg_class_contents[i], j);
}
- bcopy (initial_fixed_regs, fixed_regs, sizeof fixed_regs);
- bcopy (initial_call_used_regs, call_used_regs, sizeof call_used_regs);
- bzero (global_regs, sizeof global_regs);
+ memcpy (fixed_regs, initial_fixed_regs, sizeof fixed_regs);
+ 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;
+#endif
}
/* After switches have been processed, which perhaps alter
init_reg_sets_1 ()
{
register unsigned int i, j;
+ register unsigned int /* enum machine_mode */ m;
/* This macro allows the fixed or call-used registers
and the register classes to depend on target flags. */
/* Compute number of hard regs in each class. */
- bzero ((char *) reg_class_size, sizeof reg_class_size);
+ memset ((char *) reg_class_size, 0, sizeof reg_class_size);
for (i = 0; i < N_REG_CLASSES; i++)
for (j = 0; j < FIRST_PSEUDO_REGISTER; j++)
if (TEST_HARD_REG_BIT (reg_class_contents[i], j))
CLEAR_HARD_REG_SET (call_used_reg_set);
CLEAR_HARD_REG_SET (call_fixed_reg_set);
- bcopy (fixed_regs, call_fixed_regs, sizeof call_fixed_regs);
+ memcpy (call_fixed_regs, fixed_regs, sizeof call_fixed_regs);
n_non_fixed_regs = 0;
/* Initialize the move cost table. Find every subset of each class
and take the maximum cost of moving any subset to any other. */
- for (i = 0; i < N_REG_CLASSES; i++)
- for (j = 0; j < N_REG_CLASSES; j++)
- {
- int cost = i == j ? 2 : REGISTER_MOVE_COST (i, j);
- enum reg_class *p1, *p2;
+ for (m = 0; m < MAX_MACHINE_MODE; m++)
+ for (i = 0; i < N_REG_CLASSES; i++)
+ for (j = 0; j < N_REG_CLASSES; j++)
+ {
+ int cost = i == j ? 2 : REGISTER_MOVE_COST (m, i, j);
+ enum reg_class *p1, *p2;
- for (p2 = ®_class_subclasses[j][0]; *p2 != LIM_REG_CLASSES; p2++)
- if (*p2 != i)
- cost = MAX (cost, REGISTER_MOVE_COST (i, *p2));
+ for (p2 = ®_class_subclasses[j][0]; *p2 != LIM_REG_CLASSES; p2++)
+ if (*p2 != i)
+ cost = MAX (cost, REGISTER_MOVE_COST (m, i, *p2));
- for (p1 = ®_class_subclasses[i][0]; *p1 != LIM_REG_CLASSES; p1++)
- {
- if (*p1 != j)
- cost = MAX (cost, REGISTER_MOVE_COST (*p1, j));
+ for (p1 = ®_class_subclasses[i][0]; *p1 != LIM_REG_CLASSES; p1++)
+ {
+ if (*p1 != j)
+ cost = MAX (cost, REGISTER_MOVE_COST (m, *p1, j));
- for (p2 = ®_class_subclasses[j][0];
- *p2 != LIM_REG_CLASSES; p2++)
- if (*p1 != *p2)
- cost = MAX (cost, REGISTER_MOVE_COST (*p1, *p2));
- }
+ for (p2 = ®_class_subclasses[j][0];
+ *p2 != LIM_REG_CLASSES; p2++)
+ if (*p1 != *p2)
+ cost = MAX (cost, REGISTER_MOVE_COST (m, *p1, *p2));
+ }
- move_cost[i][j] = cost;
+ move_cost[m][i][j] = cost;
- if (reg_class_subset_p (i, j))
- may_move_in_cost[i][j] = 0;
- else
- may_move_in_cost[i][j] = cost;
+ if (reg_class_subset_p (i, j))
+ may_move_in_cost[m][i][j] = 0;
+ else
+ may_move_in_cost[m][i][j] = cost;
- if (reg_class_subset_p (j, i))
- may_move_out_cost[i][j] = 0;
- else
- may_move_out_cost[i][j] = cost;
+ if (reg_class_subset_p (j, i))
+ may_move_out_cost[m][i][j] = 0;
+ else
+ may_move_out_cost[m][i][j] = cost;
+ }
+
+#ifdef CLASS_CANNOT_CHANGE_MODE
+ {
+ HARD_REG_SET c;
+ COMPL_HARD_REG_SET (c, reg_class_contents[CLASS_CANNOT_CHANGE_MODE]);
+
+ for (i = 0; i < N_REG_CLASSES; i++)
+ {
+ GO_IF_HARD_REG_SUBSET (reg_class_contents[i], c, ok_class);
+ class_can_change_mode [i] = 0;
+ continue;
+ ok_class:
+ class_can_change_mode [i] = 1;
}
+ }
+#endif /* CLASS_CANNOT_CHANGE_MODE */
}
/* Compute the table of register modes.
/* Make some fake stack-frame MEM references for use in
memory_move_secondary_cost. */
int i;
+
for (i = 0; i < MAX_MACHINE_MODE; i++)
top_of_stack[i] = gen_rtx_MEM (i, stack_pointer_rtx);
ggc_add_rtx_root (top_of_stack, MAX_MACHINE_MODE);
enum reg_class altclass;
int partial_cost = 0;
/* We need a memory reference to feed to SECONDARY... macros. */
- rtx mem = top_of_stack[(int) mode];
+ /* mem may be unused even if the SECONDARY_ macros are defined. */
+ rtx mem ATTRIBUTE_UNUSED = top_of_stack[(int) mode];
+
if (in)
{
return 0;
if (in)
- partial_cost = REGISTER_MOVE_COST (altclass, class);
+ partial_cost = REGISTER_MOVE_COST (mode, altclass, class);
else
- partial_cost = REGISTER_MOVE_COST (class, altclass);
+ partial_cost = REGISTER_MOVE_COST (mode, class, altclass);
if (class == altclass)
/* This isn't simply a copy-to-temporary situation. Can't guess
enum machine_mode
choose_hard_reg_mode (regno, nregs)
- int regno;
- int nregs;
+ unsigned int regno ATTRIBUTE_UNUSED;
+ unsigned int nregs;
{
enum machine_mode found_mode = VOIDmode, mode;
if (found_mode != VOIDmode)
return found_mode;
- if (HARD_REGNO_NREGS (regno, CCmode) == nregs
- && HARD_REGNO_MODE_OK (regno, CCmode))
- return CCmode;
+ /* Iterate over all of the CCmodes. */
+ for (mode = CCmode; mode < NUM_MACHINE_MODES; ++mode)
+ if (HARD_REGNO_NREGS (regno, mode) == nregs
+ && HARD_REGNO_MODE_OK (regno, mode))
+ return mode;
/* We can't find a mode valid for this register. */
return VOIDmode;
globalize_reg (i)
int i;
{
+ if (fixed_regs[i] == 0 && no_global_reg_vars)
+ error ("global register variable follows a function definition");
+
if (global_regs[i])
{
warning ("register used for two global register variables");
static struct costs init_cost;
-/* Record the same data by operand number, accumulated for each alternative
- in an insn. The contribution to a pseudo is that of the minimum-cost
- alternative. */
-
-static struct costs op_costs[MAX_RECOG_OPERANDS];
-
/* Record preferrences of each pseudo.
This is available after `regclass' is run. */
static struct reg_pref *reg_pref_buffer;
-/* Record the depth of loops that we are in. */
-
-static int loop_depth;
-
/* Account for the fact that insns within a loop are executed very commonly,
but don't keep doing this as loops go too deep. */
static int loop_cost;
-static rtx scan_one_insn PROTO((rtx, int));
-static void dump_regclass PROTO((FILE *));
-static void record_reg_classes PROTO((int, int, rtx *, enum machine_mode *,
- char *, const char **, rtx));
-static int copy_cost PROTO((rtx, enum machine_mode,
+static rtx scan_one_insn PARAMS ((rtx, int));
+static void record_operand_costs PARAMS ((rtx, struct costs *, struct reg_pref *));
+static void dump_regclass PARAMS ((FILE *));
+static void record_reg_classes PARAMS ((int, int, rtx *, enum machine_mode *,
+ const char **, rtx,
+ struct costs *, struct reg_pref *));
+static int copy_cost PARAMS ((rtx, enum machine_mode,
enum reg_class, int));
-static void record_address_regs PROTO((rtx, enum reg_class, int));
+static void record_address_regs PARAMS ((rtx, enum reg_class, int));
#ifdef FORBIDDEN_INC_DEC_CLASSES
-static int auto_inc_dec_reg_p PROTO((rtx, enum machine_mode));
+static int auto_inc_dec_reg_p PARAMS ((rtx, enum machine_mode));
#endif
-static void reg_scan_mark_refs PROTO((rtx, rtx, int, int));
+static void reg_scan_mark_refs PARAMS ((rtx, rtx, int, unsigned int));
/* Return the reg_class in which pseudo reg number REGNO is best allocated.
This function is sometimes called before the info has been computed.
/* This prevents dump_flow_info from losing if called
before regclass is run. */
reg_pref = NULL;
+
+ /* No more global register variables may be declared. */
+ no_global_reg_vars = 1;
}
\f
/* Dump register costs. */
-void
+static void
dump_regclass (dump)
FILE *dump;
{
enum reg_class class;
if (REG_N_REFS (i))
{
- fprintf (dump, ";; Register %i costs:", i);
+ fprintf (dump, " Register %i costs:", i);
for (class = 0; class < N_REG_CLASSES; class++)
fprintf (dump, " %s:%i", reg_class_names[(int) class],
costs[i].cost[class]);
- fprintf (dump, " MEM:%i\n\n", costs[i].mem_cost);
+ fprintf (dump, " MEM:%i\n", costs[i].mem_cost);
}
}
}
+\f
+
+/* Calculate the costs of insn operands. */
+
+static void
+record_operand_costs (insn, op_costs, reg_pref)
+ rtx insn;
+ struct costs *op_costs;
+ struct reg_pref *reg_pref;
+{
+ const char *constraints[MAX_RECOG_OPERANDS];
+ enum machine_mode modes[MAX_RECOG_OPERANDS];
+ int i;
+ for (i = 0; i < recog_data.n_operands; i++)
+ {
+ constraints[i] = recog_data.constraints[i];
+ modes[i] = recog_data.operand_mode[i];
+ }
+
+ /* If we get here, we are set up to record the costs of all the
+ operands for this insn. Start by initializing the costs.
+ Then handle any address registers. Finally record the desired
+ classes for any pseudos, doing it twice if some pair of
+ operands are commutative. */
+
+ for (i = 0; i < recog_data.n_operands; i++)
+ {
+ op_costs[i] = init_cost;
+
+ if (GET_CODE (recog_data.operand[i]) == SUBREG)
+ {
+ rtx inner = SUBREG_REG (recog_data.operand[i]);
+#ifdef CLASS_CANNOT_CHANGE_MODE
+ if (GET_CODE (inner) == REG
+ && CLASS_CANNOT_CHANGE_MODE_P (modes[i], GET_MODE (inner)))
+ SET_REGNO_REG_SET (reg_changes_mode, REGNO (inner));
+#endif
+ recog_data.operand[i] = inner;
+ }
+
+ if (GET_CODE (recog_data.operand[i]) == MEM)
+ record_address_regs (XEXP (recog_data.operand[i], 0),
+ BASE_REG_CLASS, loop_cost * 2);
+ else if (constraints[i][0] == 'p')
+ record_address_regs (recog_data.operand[i],
+ BASE_REG_CLASS, loop_cost * 2);
+ }
+
+ /* Check for commutative in a separate loop so everything will
+ have been initialized. We must do this even if one operand
+ is a constant--see addsi3 in m68k.md. */
+
+ for (i = 0; i < (int) recog_data.n_operands - 1; i++)
+ if (constraints[i][0] == '%')
+ {
+ const char *xconstraints[MAX_RECOG_OPERANDS];
+ int j;
+
+ /* Handle commutative operands by swapping the constraints.
+ We assume the modes are the same. */
+
+ for (j = 0; j < recog_data.n_operands; j++)
+ xconstraints[j] = constraints[j];
+
+ xconstraints[i] = constraints[i+1];
+ xconstraints[i+1] = constraints[i];
+ record_reg_classes (recog_data.n_alternatives, recog_data.n_operands,
+ recog_data.operand, modes,
+ xconstraints, insn, op_costs, reg_pref);
+ }
+
+ record_reg_classes (recog_data.n_alternatives, recog_data.n_operands,
+ recog_data.operand, modes,
+ constraints, insn, op_costs, reg_pref);
+}
\f
/* Subroutine of regclass, processes one insn INSN. Scan it and record each
time it would save code to put a certain register in a certain class.
{
enum rtx_code code = GET_CODE (insn);
enum rtx_code pat_code;
- const char *constraints[MAX_RECOG_OPERANDS];
- enum machine_mode modes[MAX_RECOG_OPERANDS];
- char subreg_changes_size[MAX_RECOG_OPERANDS];
rtx set, note;
int i, j;
-
- /* Show that an insn inside a loop is likely to be executed three
- times more than insns outside a loop. This is much more aggressive
- than the assumptions made elsewhere and is being tried as an
- experiment. */
-
- if (code == NOTE)
- {
- if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_BEG)
- loop_depth++, loop_cost = 1 << (2 * MIN (loop_depth, 5));
- else if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_END)
- loop_depth--, loop_cost = 1 << (2 * MIN (loop_depth, 5));
-
- return insn;
- }
+ struct costs op_costs[MAX_RECOG_OPERANDS];
if (GET_RTX_CLASS (code) != 'i')
return insn;
set = single_set (insn);
extract_insn (insn);
- for (i = 0; i < recog_data.n_operands; i++)
- {
- constraints[i] = recog_data.constraints[i];
- modes[i] = recog_data.operand_mode[i];
- }
- memset (subreg_changes_size, 0, sizeof (subreg_changes_size));
-
/* If this insn loads a parameter from its stack slot, then
it represents a savings, rather than a cost, if the
parameter is stored in memory. Record this fact. */
return PREV_INSN (newinsn);
}
- /* If we get here, we are set up to record the costs of all the
- operands for this insn. Start by initializing the costs.
- Then handle any address registers. Finally record the desired
- classes for any pseudos, doing it twice if some pair of
- operands are commutative. */
-
- for (i = 0; i < recog_data.n_operands; i++)
- {
- op_costs[i] = init_cost;
-
- if (GET_CODE (recog_data.operand[i]) == SUBREG)
- {
- rtx inner = SUBREG_REG (recog_data.operand[i]);
- if (GET_MODE_SIZE (modes[i]) != GET_MODE_SIZE (GET_MODE (inner)))
- subreg_changes_size[i] = 1;
- recog_data.operand[i] = inner;
- }
-
- if (GET_CODE (recog_data.operand[i]) == MEM)
- record_address_regs (XEXP (recog_data.operand[i], 0),
- BASE_REG_CLASS, loop_cost * 2);
- else if (constraints[i][0] == 'p')
- record_address_regs (recog_data.operand[i],
- BASE_REG_CLASS, loop_cost * 2);
- }
-
- /* Check for commutative in a separate loop so everything will
- have been initialized. We must do this even if one operand
- is a constant--see addsi3 in m68k.md. */
-
- for (i = 0; i < (int) recog_data.n_operands - 1; i++)
- if (constraints[i][0] == '%')
- {
- const char *xconstraints[MAX_RECOG_OPERANDS];
- int j;
-
- /* Handle commutative operands by swapping the constraints.
- We assume the modes are the same. */
-
- for (j = 0; j < recog_data.n_operands; j++)
- xconstraints[j] = constraints[j];
-
- xconstraints[i] = constraints[i+1];
- xconstraints[i+1] = constraints[i];
- record_reg_classes (recog_data.n_alternatives, recog_data.n_operands,
- recog_data.operand, modes, subreg_changes_size,
- xconstraints, insn);
- }
-
- record_reg_classes (recog_data.n_alternatives, recog_data.n_operands,
- recog_data.operand, modes, subreg_changes_size,
- constraints, insn);
+ record_operand_costs (insn, op_costs, reg_pref);
/* Now add the cost for each operand to the total costs for
its register. */
costs = (struct costs *) xmalloc (nregs * sizeof (struct costs));
+#ifdef CLASS_CANNOT_CHANGE_MODE
+ reg_changes_mode = BITMAP_XMALLOC();
+#endif
+
#ifdef FORBIDDEN_INC_DEC_CLASSES
in_inc_dec = (char *) xmalloc (nregs);
for (pass = 0; pass <= flag_expensive_optimizations; pass++)
{
+ int index;
+
+ if (dump)
+ fprintf (dump, "\n\nPass %i\n\n",pass);
/* Zero out our accumulation of the cost of each class for each reg. */
- bzero ((char *) costs, nregs * sizeof (struct costs));
+ memset ((char *) costs, 0, nregs * sizeof (struct costs));
#ifdef FORBIDDEN_INC_DEC_CLASSES
- bzero (in_inc_dec, nregs);
+ memset (in_inc_dec, 0, nregs);
#endif
- loop_depth = 0, loop_cost = 1;
-
/* Scan the instructions and record each time it would
save code to put a certain register in a certain class. */
- for (insn = f; insn; insn = NEXT_INSN (insn))
+ if (!optimize)
{
- insn = scan_one_insn (insn, pass);
+ loop_cost = 1;
+ for (insn = f; insn; insn = NEXT_INSN (insn))
+ insn = scan_one_insn (insn, pass);
}
+ else
+ for (index = 0; index < n_basic_blocks; index++)
+ {
+ basic_block bb = BASIC_BLOCK (index);
+
+ /* Show that an insn inside a loop is likely to be executed three
+ times more than insns outside a loop. This is much more
+ aggressive than the assumptions made elsewhere and is being
+ tried as an experiment. */
+ if (optimize_size)
+ loop_cost = 1;
+ else
+ loop_cost = 1 << (2 * MIN (bb->loop_depth, 5));
+ for (insn = bb->head; ; insn = NEXT_INSN (insn))
+ {
+ insn = scan_one_insn (insn, pass);
+ if (insn == bb->end)
+ break;
+ }
+ }
/* Now for each register look at how desirable each class is
and find which class is preferred. Store that in
if (pass == 0)
reg_pref = reg_pref_buffer;
+ if (dump)
+ {
+ dump_regclass (dump);
+ fprintf (dump,"\n");
+ }
for (i = FIRST_PSEUDO_REGISTER; i < nregs; i++)
{
register int best_cost = (1 << (HOST_BITS_PER_INT - 2)) - 1;
register int class;
register struct costs *p = &costs[i];
+ /* In non-optimizing compilation REG_N_REFS is not initialized
+ yet. */
+ if (optimize && !REG_N_REFS (i))
+ continue;
+
for (class = (int) ALL_REGS - 1; class > 0; class--)
{
/* Ignore classes that are too small for this operand or
#ifdef FORBIDDEN_INC_DEC_CLASSES
|| (in_inc_dec[i] && forbidden_inc_dec_class[class])
#endif
+#ifdef CLASS_CANNOT_CHANGE_MODE
+ || (REGNO_REG_SET_P (reg_changes_mode, i)
+ && ! class_can_change_mode [class])
+#endif
)
;
else if (p->cost[class] < best_cost)
should be provided as a register class. Don't do this if we
will be doing it again later. */
- if (pass == 1 || ! flag_expensive_optimizations)
+ if ((pass == 1 || dump) || ! flag_expensive_optimizations)
for (class = 0; class < N_REG_CLASSES; class++)
if (p->cost[class] < p->mem_cost
&& (reg_class_size[(int) reg_class_subunion[(int) alt][class]]
#ifdef FORBIDDEN_INC_DEC_CLASSES
&& ! (in_inc_dec[i] && forbidden_inc_dec_class[class])
#endif
+#ifdef CLASS_CANNOT_CHANGE_MODE
+ && ! (REGNO_REG_SET_P (reg_changes_mode, i)
+ && ! class_can_change_mode [class])
+#endif
)
alt = reg_class_subunion[(int) alt][class];
if (alt == best)
alt = NO_REGS;
+ if (dump
+ && (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]);
+ else if (alt == NO_REGS)
+ fprintf (dump, " pref %s or none\n", reg_class_names[(int) best]);
+ else
+ fprintf (dump, " pref %s, else %s\n",
+ reg_class_names[(int) best],
+ reg_class_names[(int) alt]);
+ }
+
/* We cast to (int) because (char) hits bugs in some compilers. */
reg_pref[i].prefclass = (int) best;
reg_pref[i].altclass = (int) alt;
}
}
- if (dump)
- dump_regclass (dump);
#ifdef FORBIDDEN_INC_DEC_CLASSES
free (in_inc_dec);
#endif
+#ifdef CLASS_CANNOT_CHANGE_MODE
+ BITMAP_XFREE (reg_changes_mode);
+#endif
free (costs);
}
\f
alternatives. */
static void
-record_reg_classes (n_alts, n_ops, ops, modes, subreg_changes_size,
- constraints, insn)
+record_reg_classes (n_alts, n_ops, ops, modes,
+ constraints, insn, op_costs, reg_pref)
int n_alts;
int n_ops;
rtx *ops;
enum machine_mode *modes;
- char *subreg_changes_size;
const char **constraints;
rtx insn;
+ struct costs *op_costs;
+ struct reg_pref *reg_pref;
{
int alt;
int i, j;
if (*p == 0)
{
if (GET_CODE (op) == REG && REGNO (op) >= FIRST_PSEUDO_REGISTER)
- bzero ((char *) &this_op_costs[i], sizeof this_op_costs[i]);
+ memset ((char *) &this_op_costs[i], 0, sizeof this_op_costs[i]);
continue;
}
for (class = 0; class < N_REG_CLASSES; class++)
pp->cost[class]
- = (recog_data.operand_type[i] == OP_IN
- ? may_move_in_cost[class][(int) classes[i]]
- : may_move_out_cost[(int) classes[i]][class]);
+ = ((recog_data.operand_type[i] != OP_OUT
+ ? may_move_in_cost[mode][class][(int) classes[i]]
+ : 0)
+ + (recog_data.operand_type[i] != OP_IN
+ ? may_move_out_cost[mode][(int) classes[i]][class]
+ : 0));
/* If the alternative actually allows memory, make things
a bit cheaper since we won't need an extra insn to
load it. */
pp->mem_cost
- = (MEMORY_MOVE_COST (mode, classes[i],
- recog_data.operand_type[i] == OP_IN)
- - allows_mem[i]);
+ = ((recog_data.operand_type[i] != OP_IN
+ ? MEMORY_MOVE_COST (mode, classes[i], 0)
+ : 0)
+ + (recog_data.operand_type[i] != OP_OUT
+ ? MEMORY_MOVE_COST (mode, classes[i], 1)
+ : 0) - allows_mem[i]);
/* If we have assigned a class to this register in our
first pass, add a cost to this alternative corresponding
if (reg_pref)
alt_cost
- += (may_move_in_cost[(unsigned char) reg_pref[REGNO (op)].prefclass]
+ += (may_move_in_cost[mode]
+ [(unsigned char) reg_pref[REGNO (op)].prefclass]
[(int) classes[i]]);
if (REGNO (ops[i]) != REGNO (ops[j])
win = 1;
break;
-#ifdef EXTRA_CONSTRAINT
- case 'Q':
- case 'R':
- case 'S':
- case 'T':
- case 'U':
- if (EXTRA_CONSTRAINT (op, c))
- win = 1;
- break;
-#endif
-
case 'g':
if (GET_CODE (op) == MEM
|| (CONSTANT_P (op)
break;
default:
- classes[i]
- = reg_class_subunion[(int) classes[i]]
- [(int) REG_CLASS_FROM_LETTER (c)];
+ if (REG_CLASS_FROM_LETTER (c) != NO_REGS)
+ classes[i]
+ = reg_class_subunion[(int) classes[i]]
+ [(int) REG_CLASS_FROM_LETTER (c)];
+#ifdef EXTRA_CONSTRAINT
+ else if (EXTRA_CONSTRAINT (op, c))
+ win = 1;
+#endif
+ break;
}
constraints[i] = p;
-#ifdef CLASS_CANNOT_CHANGE_SIZE
- /* If we noted a subreg earlier, and the selected class is a
- subclass of CLASS_CANNOT_CHANGE_SIZE, zap it. */
- if (subreg_changes_size[i]
- && (reg_class_subunion[(int) CLASS_CANNOT_CHANGE_SIZE]
- [(int) classes[i]]
- == CLASS_CANNOT_CHANGE_SIZE))
- classes[i] = NO_REGS;
-#endif
-
/* How we account for this operand now depends on whether it is a
pseudo register or not. If it is, we first check if any
register classes are valid. If not, we ignore this alternative,
{
if (classes[i] == NO_REGS)
{
- /* We must always fail if the operand is a REG, but
- we did not find a suitable class.
-
- Otherwise we may perform an uninitialized read
- from this_op_costs after the `continue' statement
- below. */
- alt_fail = 1;
+ /* We must always fail if the operand is a REG, but
+ we did not find a suitable class.
+
+ Otherwise we may perform an uninitialized read
+ from this_op_costs after the `continue' statement
+ below. */
+ alt_fail = 1;
}
else
{
for (class = 0; class < N_REG_CLASSES; class++)
pp->cost[class]
- = (recog_data.operand_type[i] == OP_IN
- ? may_move_in_cost[class][(int) classes[i]]
- : may_move_out_cost[(int) classes[i]][class]);
+ = ((recog_data.operand_type[i] != OP_OUT
+ ? may_move_in_cost[mode][class][(int) classes[i]]
+ : 0)
+ + (recog_data.operand_type[i] != OP_IN
+ ? may_move_out_cost[mode][(int) classes[i]][class]
+ : 0));
/* If the alternative actually allows memory, make things
a bit cheaper since we won't need an extra insn to
load it. */
pp->mem_cost
- = (MEMORY_MOVE_COST (mode, classes[i],
- recog_data.operand_type[i] == OP_IN)
- - allows_mem[i]);
+ = ((recog_data.operand_type[i] != OP_IN
+ ? MEMORY_MOVE_COST (mode, classes[i], 0)
+ : 0)
+ + (recog_data.operand_type[i] != OP_OUT
+ ? MEMORY_MOVE_COST (mode, classes[i], 1)
+ : 0) - allows_mem[i]);
/* If we have assigned a class to this register in our
first pass, add a cost to this alternative corresponding
if (reg_pref)
alt_cost
- += (may_move_in_cost[(unsigned char) reg_pref[REGNO (op)].prefclass]
+ += (may_move_in_cost[mode]
+ [(unsigned char) reg_pref[REGNO (op)].prefclass]
[(int) classes[i]]);
}
}
}
/* If this insn is a single set copying operand 1 to operand 0
- and one is a pseudo with the other a hard reg that is in its
- own register class, set the cost of that register class to -1. */
+ and one operand is a pseudo with the other a hard reg or a pseudo
+ that prefers a register that is in its own register class then
+ we may want to adjust the cost of that register class to -1.
+
+ Avoid the adjustment if the source does not die to avoid stressing of
+ register allocator by preferrencing two coliding registers into single
+ class.
+
+ Also avoid the adjustment if a copy between registers of the class
+ is expensive (ten times the cost of a default copy is considered
+ arbitrarily expensive). This avoids losing when the preferred class
+ is very expensive as the source of a copy instruction. */
if ((set = single_set (insn)) != 0
&& ops[0] == SET_DEST (set) && ops[1] == SET_SRC (set)
- && GET_CODE (ops[0]) == REG && GET_CODE (ops[1]) == REG)
+ && GET_CODE (ops[0]) == REG && GET_CODE (ops[1]) == REG
+ && find_regno_note (insn, REG_DEAD, REGNO (ops[1])))
for (i = 0; i <= 1; i++)
if (REGNO (ops[i]) >= FIRST_PSEUDO_REGISTER)
{
- int regno = REGNO (ops[!i]);
+ unsigned int regno = REGNO (ops[!i]);
enum machine_mode mode = GET_MODE (ops[!i]);
int class;
- int nr;
+ unsigned int nr;
+
+ if (regno >= FIRST_PSEUDO_REGISTER && reg_pref != 0)
+ {
+ enum reg_class pref = reg_pref[regno].prefclass;
- if (regno >= FIRST_PSEUDO_REGISTER && reg_pref != 0
- && (reg_class_size[(unsigned char) reg_pref[regno].prefclass]
- == CLASS_MAX_NREGS (reg_pref[regno].prefclass, mode)))
- op_costs[i].cost[(unsigned char) reg_pref[regno].prefclass] = -1;
+ if ((reg_class_size[(unsigned char) pref]
+ == CLASS_MAX_NREGS (pref, mode))
+ && REGISTER_MOVE_COST (mode, pref, pref) < 10 * 2)
+ op_costs[i].cost[(unsigned char) pref] = -1;
+ }
else if (regno < FIRST_PSEUDO_REGISTER)
for (class = 0; class < N_REG_CLASSES; class++)
if (TEST_HARD_REG_BIT (reg_class_contents[class], regno)
op_costs[i].cost[class] = -1;
else
{
- for (nr = 0; nr < HARD_REGNO_NREGS(regno, mode); nr++)
+ for (nr = 0; nr < HARD_REGNO_NREGS (regno, mode); nr++)
{
- if (!TEST_HARD_REG_BIT (reg_class_contents[class], regno + nr))
+ if (! TEST_HARD_REG_BIT (reg_class_contents[class],
+ regno + nr))
break;
}
- if (nr == HARD_REGNO_NREGS(regno,mode))
+ if (nr == HARD_REGNO_NREGS (regno,mode))
op_costs[i].cost[class] = -1;
}
}
static int
copy_cost (x, mode, class, to_p)
rtx x;
- enum machine_mode mode;
+ enum machine_mode mode ATTRIBUTE_UNUSED;
enum reg_class class;
- int to_p;
+ int to_p ATTRIBUTE_UNUSED;
{
#ifdef HAVE_SECONDARY_RELOADS
enum reg_class secondary_class = NO_REGS;
#endif
if (secondary_class != NO_REGS)
- return (move_cost[(int) secondary_class][(int) class]
+ return (move_cost[mode][(int) secondary_class][(int) class]
+ copy_cost (x, mode, secondary_class, 2));
#endif /* HAVE_SECONDARY_RELOADS */
return MEMORY_MOVE_COST (mode, class, to_p);
else if (GET_CODE (x) == REG)
- return move_cost[(int) REGNO_REG_CLASS (REGNO (x))][(int) class];
+ return 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 2;
+ return COSTS_N_INSNS (1);
}
\f
/* Record the pseudo registers we must reload into hard registers
/* When we have an address that is a sum,
we must determine whether registers are "base" or "index" regs.
If there is a sum of two registers, we must choose one to be
- the "base". Luckily, we can use the REGNO_POINTER_FLAG
- to make a good choice most of the time. We only need to do this
- on machines that can have two registers in an address and where
- the base and index register classes are different.
+ the "base". Luckily, we can use the REG_POINTER to make a good
+ choice most of the time. We only need to do this on machines
+ that can have two registers in an address and where the base
+ and index register classes are different.
??? This code used to set REGNO_POINTER_FLAG in some cases, but
that seems bogus since it should only be set when we are sure
with the other operand the index. Likewise if the other operand
is a MULT. */
- else if ((code0 == REG && REGNO_POINTER_FLAG (REGNO (arg0)))
+ else if ((code0 == REG && REG_POINTER (arg0))
|| code1 == MULT)
{
record_address_regs (arg0, BASE_REG_CLASS, scale);
record_address_regs (arg1, INDEX_REG_CLASS, scale);
}
- else if ((code1 == REG && REGNO_POINTER_FLAG (REGNO (arg1)))
+ else if ((code1 == REG && REG_POINTER (arg1))
|| code0 == MULT)
{
record_address_regs (arg0, INDEX_REG_CLASS, scale);
}
break;
+ /* Double the importance of a pseudo register that is incremented
+ or decremented, since it would take two extra insns
+ if it ends up in the wrong place. */
+ case POST_MODIFY:
+ case PRE_MODIFY:
+ record_address_regs (XEXP (x, 0), BASE_REG_CLASS, 2 * scale);
+ if (REG_P (XEXP (XEXP (x, 1), 1)))
+ record_address_regs (XEXP (XEXP (x, 1), 1),
+ INDEX_REG_CLASS, 2 * scale);
+ break;
+
case POST_INC:
case PRE_INC:
case POST_DEC:
pp->mem_cost += (MEMORY_MOVE_COST (Pmode, class, 1) * scale) / 2;
for (i = 0; i < N_REG_CLASSES; i++)
- pp->cost[i] += (may_move_in_cost[i][(int) class] * scale) / 2;
+ pp->cost[i] += (may_move_in_cost[Pmode][i][(int) class] * scale) / 2;
}
break;
}
#endif
\f
-static short *renumber = (short *)0;
-static size_t regno_allocated = 0;
+static short *renumber;
+static size_t regno_allocated;
+static unsigned int reg_n_max;
/* Allocate enough space to hold NUM_REGS registers for the tables used for
reg_scan and flow_analysis that are indexed by the register number. If
size_t size_renumber;
size_t min = (new_p) ? 0 : reg_n_max;
struct reg_info_data *reg_data;
- struct reg_info_data *reg_next;
if (num_regs > regno_allocated)
{
{
/* Loop through each of the segments allocated for the actual
reg_info pages, and set up the pointers, zero the pages, etc. */
- for (reg_data = reg_info_head; reg_data; reg_data = reg_next)
+ for (reg_data = reg_info_head;
+ reg_data && reg_data->max_index >= min;
+ reg_data = reg_data->next)
{
size_t min_index = reg_data->min_index;
size_t max_index = reg_data->max_index;
+ size_t max = MIN (max_index, num_regs);
+ size_t local_min = min - min_index;
+ size_t i;
- reg_next = reg_data->next;
- if (min <= max_index)
- {
- size_t max = max_index;
- size_t local_min = min - min_index;
- size_t i;
-
- if (min < min_index)
- local_min = 0;
- if (!reg_data->used_p) /* page just allocated with calloc */
- reg_data->used_p = 1; /* no need to zero */
- else
- bzero ((char *) ®_data->data[local_min],
- sizeof (reg_info) * (max - min_index - local_min + 1));
+ if (reg_data->min_index > num_regs)
+ continue;
- for (i = min_index+local_min; i <= max; i++)
- {
- VARRAY_REG (reg_n_info, i) = ®_data->data[i-min_index];
- REG_BASIC_BLOCK (i) = REG_BLOCK_UNKNOWN;
- renumber[i] = -1;
- reg_pref_buffer[i].prefclass = (char) NO_REGS;
- reg_pref_buffer[i].altclass = (char) NO_REGS;
- }
+ if (min < min_index)
+ local_min = 0;
+ if (!reg_data->used_p) /* page just allocated with calloc */
+ reg_data->used_p = 1; /* no need to zero */
+ else
+ memset ((char *) ®_data->data[local_min], 0,
+ sizeof (reg_info) * (max - min_index - local_min + 1));
+
+ for (i = min_index+local_min; i <= max; i++)
+ {
+ VARRAY_REG (reg_n_info, i) = ®_data->data[i-min_index];
+ REG_BASIC_BLOCK (i) = REG_BLOCK_UNKNOWN;
+ renumber[i] = -1;
+ reg_pref_buffer[i].prefclass = (char) NO_REGS;
+ reg_pref_buffer[i].altclass = (char) NO_REGS;
}
}
}
void
reg_scan (f, nregs, repeat)
rtx f;
- int nregs;
- int repeat;
+ unsigned int nregs;
+ int repeat ATTRIBUTE_UNUSED;
{
register rtx insn;
such a REG. We only update information for those. */
void
-reg_scan_update(first, last, old_max_regno)
+reg_scan_update (first, last, old_max_regno)
rtx first;
rtx last;
- int old_max_regno;
+ unsigned int old_max_regno;
{
register rtx insn;
rtx x;
rtx insn;
int note_flag;
- int min_regno;
+ unsigned int min_regno;
{
register enum rtx_code code;
register rtx dest;
case REG:
{
- register int regno = REGNO (x);
+ unsigned int regno = REGNO (x);
if (regno >= min_regno)
{
/* If the destination pseudo is set more than once, then other
sets might not be to a pointer value (consider access to a
union in two threads of control in the presense of global
- optimizations). So only set REGNO_POINTER_FLAG on the destination
+ optimizations). So only set REG_POINTER on the destination
pseudo if this is the only set of that pseudo. */
&& REG_N_SETS (REGNO (SET_DEST (x))) == 1
&& ! REG_USERVAR_P (SET_DEST (x))
- && ! REGNO_POINTER_FLAG (REGNO (SET_DEST (x)))
+ && ! REG_POINTER (SET_DEST (x))
&& ((GET_CODE (SET_SRC (x)) == REG
- && REGNO_POINTER_FLAG (REGNO (SET_SRC (x))))
+ && REG_POINTER (SET_SRC (x)))
|| ((GET_CODE (SET_SRC (x)) == PLUS
|| GET_CODE (SET_SRC (x)) == LO_SUM)
&& GET_CODE (XEXP (SET_SRC (x), 1)) == CONST_INT
&& GET_CODE (XEXP (SET_SRC (x), 0)) == REG
- && REGNO_POINTER_FLAG (REGNO (XEXP (SET_SRC (x), 0))))
+ && REG_POINTER (XEXP (SET_SRC (x), 0)))
|| GET_CODE (SET_SRC (x)) == CONST
|| GET_CODE (SET_SRC (x)) == SYMBOL_REF
|| GET_CODE (SET_SRC (x)) == LABEL_REF
&& (GET_CODE (XEXP (note, 0)) == CONST
|| GET_CODE (XEXP (note, 0)) == SYMBOL_REF
|| GET_CODE (XEXP (note, 0)) == LABEL_REF))))
- REGNO_POINTER_FLAG (REGNO (SET_DEST (x))) = 1;
+ REG_POINTER (SET_DEST (x)) = 1;
/* ... fall through ... */
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