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lra.c (lra): Clear lra_optional_reload_pseudos before every constraint pass.

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2013-09-10  Vladimir Makarov  <vmakarov@redhat.com>

	* lra.c (lra): Clear lra_optional_reload_pseudos before every
	constraint pass.
	* lra-constraints.c (curr_insn_transform): Switch on optional
	reloads.  Check destination too to check move insn.
	(undo_optional_reloads): Add check that the original peudo did not
	changed its allocation and the optional reload was inherited on
	last inheritance pass.  Break loop after deciding to keep optional
	reload.
	(lra_undo_inheritance): Add check that inherited pseudo still in
	memory.

From-SVN: r202468
This commit is contained in:
Vladimir Makarov 2013-09-10 15:37:57 +00:00 committed by Vladimir Makarov
parent 14c3433049
commit b0681c9e51
3 changed files with 62 additions and 25 deletions
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13
gcc/ChangeLog
View File

@ -1,3 +1,16 @@
2013-09-10 Vladimir Makarov <vmakarov@redhat.com>
* lra.c (lra): Clear lra_optional_reload_pseudos before every
constraint pass.
* lra-constraints.c (curr_insn_transform): Switch on optional
reloads. Check destination too to check move insn.
(undo_optional_reloads): Add check that the original peudo did not
changed its allocation and the optional reload was inherited on
last inheritance pass. Break loop after deciding to keep optional
reload.
(lra_undo_inheritance): Add check that inherited pseudo still in
memory.
2013-09-10 James Greenhalgh <james.greenhalgh@arm.com>
* config/aarch64/aarch64.md (generic_sched): New.

44
gcc/lra-constraints.c
View File

@ -3309,15 +3309,19 @@ curr_insn_transform (void)
reg, we might improve the code through inheritance. If
it does not get a hard register we coalesce memory/memory
moves later. Ignore move insns to avoid cycling. */
if (0 && ! lra_simple_p
if (! lra_simple_p
&& lra_undo_inheritance_iter < LRA_MAX_INHERITANCE_PASSES
&& goal_alt[i] != NO_REGS && REG_P (op)
&& (regno = REGNO (op)) >= FIRST_PSEUDO_REGISTER
&& ! lra_former_scratch_p (regno)
&& reg_renumber[regno] < 0
&& (curr_insn_set == NULL_RTX
|| !(REG_P (SET_SRC (curr_insn_set))
|| !((REG_P (SET_SRC (curr_insn_set))
|| MEM_P (SET_SRC (curr_insn_set))
|| GET_CODE (SET_SRC (curr_insn_set)) == SUBREG)))
|| GET_CODE (SET_SRC (curr_insn_set)) == SUBREG)
&& (REG_P (SET_DEST (curr_insn_set))
|| MEM_P (SET_DEST (curr_insn_set))
|| GET_CODE (SET_DEST (curr_insn_set)) == SUBREG))))
optional_p = true;
else
continue;
@ -5441,7 +5445,7 @@ remove_inheritance_pseudos (bitmap remove_pseudos)
static bool
undo_optional_reloads (void)
{
bool change_p;
bool change_p, keep_p;
unsigned int regno, uid;
bitmap_iterator bi, bi2;
rtx insn, set, src, dest;
@ -5451,6 +5455,14 @@ undo_optional_reloads (void)
bitmap_copy (&removed_optional_reload_pseudos, &lra_optional_reload_pseudos);
EXECUTE_IF_SET_IN_BITMAP (&lra_optional_reload_pseudos, 0, regno, bi)
if (reg_renumber[regno] >= 0)
{
keep_p = false;
if (reg_renumber[lra_reg_info[regno].restore_regno] >= 0)
/* If the original pseudo changed its allocation, just
removing the optional pseudo is dangerous as the original
pseudo will have longer live range. */
keep_p = true;
else
EXECUTE_IF_SET_IN_BITMAP (&lra_reg_info[regno].insn_bitmap, 0, uid, bi2)
{
insn = lra_insn_recog_data[uid]->insn;
@ -5460,12 +5472,20 @@ undo_optional_reloads (void)
dest = SET_DEST (set);
if (! REG_P (src) || ! REG_P (dest))
continue;
if ((REGNO (src) == regno
&& lra_reg_info[regno].restore_regno != (int) REGNO (dest))
|| (REGNO (dest) == regno
&& lra_reg_info[regno].restore_regno != (int) REGNO (src)))
if (REGNO (dest) == regno
/* Ignore insn for optional reloads itself. */
&& lra_reg_info[regno].restore_regno != (int) REGNO (src)
/* Check only inheritance on last inheritance pass. */
&& (int) REGNO (src) >= new_regno_start
/* Check that the optional reload was inherited. */
&& bitmap_bit_p (&lra_inheritance_pseudos, REGNO (src)))
{
keep_p = true;
break;
}
}
if (keep_p)
{
/* Optional reload was inherited. Keep it. */
bitmap_clear_bit (&removed_optional_reload_pseudos, regno);
if (lra_dump_file != NULL)
fprintf (lra_dump_file, "Keep optional reload reg %d\n", regno);
@ -5552,7 +5572,11 @@ lra_undo_inheritance (void)
if (lra_reg_info[regno].restore_regno >= 0)
{
n_all_inherit++;
if (reg_renumber[regno] < 0)
if (reg_renumber[regno] < 0
/* If the original pseudo changed its allocation, just
removing inheritance is dangerous as for changing
allocation we used shorter live-ranges. */
&& reg_renumber[lra_reg_info[regno].restore_regno] < 0)
bitmap_set_bit (&remove_pseudos, regno);
else
n_inherit++;

2
gcc/lra.c
View File

@ -2315,6 +2315,7 @@ lra (FILE *f)
{
for (;;)
{
bitmap_clear (&lra_optional_reload_pseudos);
/* We should try to assign hard registers to scratches even
if there were no RTL transformations in
lra_constraints. */
@ -2365,7 +2366,6 @@ lra (FILE *f)
if (! live_p)
lra_clear_live_ranges ();
}
bitmap_clear (&lra_optional_reload_pseudos);
}
bitmap_clear (&lra_subreg_reload_pseudos);
bitmap_clear (&lra_inheritance_pseudos);