static HARD_REG_SET *qty_phys_sugg;
-/* Element Q is non-zero if there is a suggested register in
- qty_phys_copy_sugg. */
+/* Element Q is the number of suggested registers in qty_phys_copy_sugg. */
-static char *qty_phys_has_copy_sugg;
+static short *qty_phys_num_copy_sugg;
-/* Element Q is non-zero if there is a suggested register in qty_phys_sugg. */
+/* Element Q is the number of suggested registers in qty_phys_sugg. */
-static char *qty_phys_has_sugg;
+static short *qty_phys_num_sugg;
/* Element Q is the number of refs to quantity Q. */
static void optimize_reg_copy_2 PROTO((rtx, rtx, rtx));
static void update_equiv_regs PROTO((void));
static void block_alloc PROTO((int));
+static int qty_sugg_compare PROTO((int, int));
+static int qty_sugg_compare_1 PROTO((int *, int *));
static int qty_compare PROTO((int, int));
static int qty_compare_1 PROTO((int *, int *));
static int combine_regs PROTO((rtx, rtx, int, int, rtx, int));
qty_phys_reg = (short *) alloca (max_qty * sizeof (short));
qty_phys_copy_sugg = (HARD_REG_SET *) alloca (max_qty * sizeof (HARD_REG_SET));
- qty_phys_has_copy_sugg = (char *) alloca (max_qty * sizeof (char));
+ qty_phys_num_copy_sugg = (short *) alloca (max_qty * sizeof (char));
qty_phys_sugg = (HARD_REG_SET *) alloca (max_qty * sizeof (HARD_REG_SET));
- qty_phys_has_sugg = (char *) alloca (max_qty * sizeof (char));
+ qty_phys_num_sugg = (short *) alloca (max_qty * sizeof (char));
qty_birth = (int *) alloca (max_qty * sizeof (int));
qty_death = (int *) alloca (max_qty * sizeof (int));
qty_scratch_rtx = (rtx *) alloca (max_qty * sizeof (rtx));
{
qty_scratch_rtx[i] = 0;
CLEAR_HARD_REG_SET (qty_phys_copy_sugg[i]);
- qty_phys_has_copy_sugg[i] = 0;
+ qty_phys_num_copy_sugg[i] = 0;
CLEAR_HARD_REG_SET (qty_phys_sugg[i]);
- qty_phys_has_sugg[i] = 0;
+ qty_phys_num_sugg[i] = 0;
}
}
else
CLEAR (qty_scratch_rtx);
CLEAR (qty_phys_copy_sugg);
- CLEAR (qty_phys_has_copy_sugg);
+ CLEAR (qty_phys_num_copy_sugg);
CLEAR (qty_phys_sugg);
- CLEAR (qty_phys_has_sugg);
+ CLEAR (qty_phys_num_sugg);
}
next_qty = 0;
should have been given a quantity, or else -1 meaning ignore it.
Every quantity should have a known birth and death.
- Order the qtys so we assign them registers in order of
- decreasing length of life. Normally call qsort, but if we
- have only a very small number of quantities, sort them ourselves. */
+ Order the qtys so we assign them registers in order of the
+ number of suggested registers they need so we allocate those with
+ the most restrictive needs first. */
qty_order = (int *) alloca (next_qty * sizeof (int));
for (i = 0; i < next_qty; i++)
{
case 3:
/* Make qty_order[2] be the one to allocate last. */
- if (qty_compare (0, 1) > 0)
+ if (qty_sugg_compare (0, 1) > 0)
EXCHANGE (0, 1);
- if (qty_compare (1, 2) > 0)
+ if (qty_sugg_compare (1, 2) > 0)
EXCHANGE (2, 1);
/* ... Fall through ... */
case 2:
/* Put the best one to allocate in qty_order[0]. */
- if (qty_compare (0, 1) > 0)
+ if (qty_sugg_compare (0, 1) > 0)
EXCHANGE (0, 1);
/* ... Fall through ... */
break;
default:
- qsort (qty_order, next_qty, sizeof (int), qty_compare_1);
+ qsort (qty_order, next_qty, sizeof (int), qty_sugg_compare_1);
}
/* Try to put each quantity in a suggested physical register, if it has one.
for (i = 0; i < next_qty; i++)
{
q = qty_order[i];
- if (qty_phys_has_sugg[q] || qty_phys_has_copy_sugg[q])
+ if (qty_phys_num_sugg[q] != 0 || qty_phys_num_copy_sugg[q] != 0)
qty_phys_reg[q] = find_free_reg (qty_min_class[q], qty_mode[q], q,
0, 1, qty_birth[q], qty_death[q]);
else
qty_phys_reg[q] = -1;
}
+ /* Order the qtys so we assign them registers in order of
+ decreasing length of life. Normally call qsort, but if we
+ have only a very small number of quantities, sort them ourselves. */
+
+ for (i = 0; i < next_qty; i++)
+ qty_order[i] = i;
+
+#define EXCHANGE(I1, I2) \
+ { i = qty_order[I1]; qty_order[I1] = qty_order[I2]; qty_order[I2] = i; }
+
+ switch (next_qty)
+ {
+ case 3:
+ /* Make qty_order[2] be the one to allocate last. */
+ if (qty_compare (0, 1) > 0)
+ EXCHANGE (0, 1);
+ if (qty_compare (1, 2) > 0)
+ EXCHANGE (2, 1);
+
+ /* ... Fall through ... */
+ case 2:
+ /* Put the best one to allocate in qty_order[0]. */
+ if (qty_compare (0, 1) > 0)
+ EXCHANGE (0, 1);
+
+ /* ... Fall through ... */
+
+ case 1:
+ case 0:
+ /* Nothing to do here. */
+ break;
+
+ default:
+ qsort (qty_order, next_qty, sizeof (int), qty_compare_1);
+ }
+
/* Now for each qty that is not a hardware register,
look for a hardware register to put it in.
First try the register class that is cheapest for this qty,
return *q1 - *q2;
}
\f
+/* Compare two quantities' priority for getting real registers. This version
+ is called for quantities that have suggested hard registers. First priority
+ goes to quantities that have copy preferences, then to those that have
+ normal preferences. Within those groups, quantities with the lower
+ number of preferenes have the highest priority. Of those, we use the same
+ algorithm as above. */
+
+static int
+qty_sugg_compare (q1, q2)
+ int q1, q2;
+{
+ register int sugg1 = (qty_phys_num_copy_sugg[q1]
+ ? qty_phys_num_copy_sugg[q1]
+ : qty_phys_num_sugg[q1] * FIRST_PSEUDO_REGISTER);
+ register int sugg2 = (qty_phys_num_copy_sugg[q2]
+ ? qty_phys_num_copy_sugg[q2]
+ : qty_phys_num_sugg[q2] * FIRST_PSEUDO_REGISTER);
+ /* Note that the quotient will never be bigger than
+ the value of floor_log2 times the maximum number of
+ times a register can occur in one insn (surely less than 100).
+ Multiplying this by 10000 can't overflow. */
+ register int pri1
+ = (((double) (floor_log2 (qty_n_refs[q1]) * qty_n_refs[q1] * qty_size[q1])
+ / (qty_death[q1] - qty_birth[q1]))
+ * 10000);
+ register int pri2
+ = (((double) (floor_log2 (qty_n_refs[q2]) * qty_n_refs[q2] * qty_size[q2])
+ / (qty_death[q2] - qty_birth[q2]))
+ * 10000);
+
+ if (sugg1 != sugg2)
+ return sugg1 - sugg2;
+
+ return pri2 - pri1;
+}
+
+static int
+qty_sugg_compare_1 (q1, q2)
+ int *q1, *q2;
+{
+ register int sugg1 = (qty_phys_num_copy_sugg[*q1]
+ ? qty_phys_num_copy_sugg[*q1]
+ : qty_phys_num_sugg[*q1] * FIRST_PSEUDO_REGISTER);
+ register int sugg2 = (qty_phys_num_copy_sugg[*q2]
+ ? qty_phys_num_copy_sugg[*q2]
+ : qty_phys_num_sugg[*q2] * FIRST_PSUEDO_REGISTER);
+
+ /* Note that the quotient will never be bigger than
+ the value of floor_log2 times the maximum number of
+ times a register can occur in one insn (surely less than 100).
+ Multiplying this by 10000 can't overflow. */
+ register int pri1
+ = (((double) (floor_log2 (qty_n_refs[*q1]) * qty_n_refs[*q1]
+ * qty_size[*q1])
+ / (qty_death[*q1] - qty_birth[*q1]))
+ * 10000);
+ register int pri2
+ = (((double) (floor_log2 (qty_n_refs[*q2]) * qty_n_refs[*q2]
+ * qty_size[*q2])
+ / (qty_death[*q2] - qty_birth[*q2]))
+ * 10000);
+
+ if (sugg1 != sugg2)
+ return sugg1 - sugg2;
+
+ if (pri1 != pri2)
+ return pri2 - pri1;
+
+ /* If qtys are equally good, sort by qty number,
+ so that the results of qsort leave nothing to chance. */
+ return *q1 - *q2;
+}
+\f
/* Attempt to combine the two registers (rtx's) USEDREG and SETREG.
Returns 1 if have done so, or 0 if cannot.
if (reg_qty[sreg] >= 0)
{
- if (may_save_copy)
+ if (may_save_copy
+ && ! TEST_HARD_REG_BIT (qty_phys_copy_sugg[reg_qty[sreg]], ureg))
{
SET_HARD_REG_BIT (qty_phys_copy_sugg[reg_qty[sreg]], ureg);
- qty_phys_has_copy_sugg[reg_qty[sreg]] = 1;
+ qty_phys_num_copy_sugg[reg_qty[sreg]]++;
}
- else
+ else if (! TEST_HARD_REG_BIT (qty_phys_sugg[reg_qty[sreg]], ureg))
{
SET_HARD_REG_BIT (qty_phys_sugg[reg_qty[sreg]], ureg);
- qty_phys_has_sugg[reg_qty[sreg]] = 1;
+ qty_phys_num_sugg[reg_qty[sreg]]++;
}
}
return 0;
if (sreg < FIRST_PSEUDO_REGISTER)
{
- if (may_save_copy)
+ if (may_save_copy
+ && ! TEST_HARD_REG_BIT (qty_phys_copy_sugg[reg_qty[ureg]], sreg))
{
SET_HARD_REG_BIT (qty_phys_copy_sugg[reg_qty[ureg]], sreg);
- qty_phys_has_copy_sugg[reg_qty[ureg]] = 1;
+ qty_phys_num_copy_sugg[reg_qty[ureg]]++;
}
- else
+ else if (! TEST_HARD_REG_BIT (qty_phys_sugg[reg_qty[ureg]], sreg))
{
SET_HARD_REG_BIT (qty_phys_sugg[reg_qty[ureg]], sreg);
- qty_phys_has_sugg[reg_qty[ureg]] = 1;
+ qty_phys_num_sugg[reg_qty[ureg]]++;
}
return 0;
}
if (just_try_suggested)
{
- if (qty_phys_has_copy_sugg[qty])
+ if (qty_phys_num_copy_sugg[qty] != 0)
IOR_COMPL_HARD_REG_SET (first_used, qty_phys_copy_sugg[qty]);
else
IOR_COMPL_HARD_REG_SET (first_used, qty_phys_sugg[qty]);
/* If it would be profitable to allocate a call-clobbered register
and save and restore it around calls, do that. */
- if (just_try_suggested && qty_phys_has_copy_sugg[qty]
- && qty_phys_has_sugg[qty])
+ if (just_try_suggested && qty_phys_num_copy_sugg[qty] != 0
+ && qty_phys_num_sugg[qty] != 0)
{
/* Don't try the copy-suggested regs again. */
- qty_phys_has_copy_sugg[qty] = 0;
+ qty_phys_num_copy_sugg[qty] = 0;
return find_free_reg (class, mode, qty, accept_call_clobbered, 1,
born_index, dead_index);
}
git://gcc.gnu.org / gcc.git / commitdiff