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expr.c (alignment_for_piecewise_move): New function.

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* expr.c (alignment_for_piecewise_move): New function.
	(widest_int_mode_for_size): New function.
	(move_by_pieces, move_by_pieces_ninsns): Call them.
	(can_store_by_pieces, store_by_pieces_1): Likewise.

From-SVN: r166802
This commit is contained in:
Nathan Froyd 2010-11-16 14:19:43 +00:00 • committed by Nathan Froyd
parent 69d540bdc7
commit d824aea207
2 changed files with 71 additions and 96 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2010-11-16 Nathan Froyd <froydnj@codesourcery.com>
* expr.c (alignment_for_piecewise_move): New function.
(widest_int_mode_for_size): New function.
(move_by_pieces, move_by_pieces_ninsns): Call them.
(can_store_by_pieces, store_by_pieces_1): Likewise.
2010-11-16 Nathan Froyd <froydnj@codesourcery.com>
* gcc.c (char_p): Define. Define a VEC of it.

160
gcc/expr.c
View file

@ -792,6 +792,50 @@ convert_modes (enum machine_mode mode, enum machine_mode oldmode, rtx x, int uns
return temp;
}
/* Return the largest alignment we can use for doing a move (or store)
of MAX_PIECES. ALIGN is the largest alignment we could use. */
static unsigned int
alignment_for_piecewise_move (unsigned int max_pieces, unsigned int align)
{
enum machine_mode tmode;
tmode = mode_for_size (max_pieces * BITS_PER_UNIT, MODE_INT, 1);
if (align >= GET_MODE_ALIGNMENT (tmode))
align = GET_MODE_ALIGNMENT (tmode);
else
{
enum machine_mode tmode, xmode;
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
tmode != VOIDmode;
xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
if (GET_MODE_SIZE (tmode) > max_pieces
|| SLOW_UNALIGNED_ACCESS (tmode, align))
break;
align = MAX (align, GET_MODE_ALIGNMENT (xmode));
}
return align;
}
/* Return the widest integer mode no wider than SIZE. If no such mode
can be found, return VOIDmode. */
static enum machine_mode
widest_int_mode_for_size (unsigned int size)
{
enum machine_mode tmode, mode = VOIDmode;
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
if (GET_MODE_SIZE (tmode) < size)
mode = tmode;
return mode;
}
/* STORE_MAX_PIECES is the number of bytes at a time that we can
store efficiently. Due to internal GCC limitations, this is
MOVE_MAX_PIECES limited by the number of bytes GCC can represent
@ -831,7 +875,6 @@ move_by_pieces (rtx to, rtx from, unsigned HOST_WIDE_INT len,
= targetm.addr_space.address_mode (MEM_ADDR_SPACE (from));
rtx to_addr, from_addr = XEXP (from, 0);
unsigned int max_size = MOVE_MAX_PIECES + 1;
enum machine_mode mode = VOIDmode, tmode;
enum insn_code icode;
align = MIN (to ? MEM_ALIGN (to) : align, MEM_ALIGN (from));
@ -879,11 +922,11 @@ move_by_pieces (rtx to, rtx from, unsigned HOST_WIDE_INT len,
if (!(data.autinc_from && data.autinc_to)
&& move_by_pieces_ninsns (len, align, max_size) > 2)
{
/* Find the mode of the largest move... */
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
if (GET_MODE_SIZE (tmode) < max_size)
mode = tmode;
/* Find the mode of the largest move...
MODE might not be used depending on the definitions of the
USE_* macros below. */
enum machine_mode mode ATTRIBUTE_UNUSED
= widest_int_mode_for_size (max_size);
if (USE_LOAD_PRE_DECREMENT (mode) && data.reverse && ! data.autinc_from)
{
@ -917,32 +960,14 @@ move_by_pieces (rtx to, rtx from, unsigned HOST_WIDE_INT len,
data.to_addr = copy_to_mode_reg (to_addr_mode, to_addr);
}
tmode = mode_for_size (MOVE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
if (align >= GET_MODE_ALIGNMENT (tmode))
align = GET_MODE_ALIGNMENT (tmode);
else
{
enum machine_mode xmode;
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
tmode != VOIDmode;
xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
if (GET_MODE_SIZE (tmode) > MOVE_MAX_PIECES
|| SLOW_UNALIGNED_ACCESS (tmode, align))
break;
align = MAX (align, GET_MODE_ALIGNMENT (xmode));
}
align = alignment_for_piecewise_move (MOVE_MAX_PIECES, align);
/* First move what we can in the largest integer mode, then go to
successively smaller modes. */
while (max_size > 1)
{
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
if (GET_MODE_SIZE (tmode) < max_size)
mode = tmode;
enum machine_mode mode = widest_int_mode_for_size (max_size);
if (mode == VOIDmode)
break;
@ -996,34 +1021,15 @@ move_by_pieces_ninsns (unsigned HOST_WIDE_INT l, unsigned int align,
unsigned int max_size)
{
unsigned HOST_WIDE_INT n_insns = 0;
enum machine_mode tmode;
tmode = mode_for_size (MOVE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
if (align >= GET_MODE_ALIGNMENT (tmode))
align = GET_MODE_ALIGNMENT (tmode);
else
{
enum machine_mode tmode, xmode;
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
tmode != VOIDmode;
xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
if (GET_MODE_SIZE (tmode) > MOVE_MAX_PIECES
|| SLOW_UNALIGNED_ACCESS (tmode, align))
break;
align = MAX (align, GET_MODE_ALIGNMENT (xmode));
}
align = alignment_for_piecewise_move (MOVE_MAX_PIECES, align);
while (max_size > 1)
{
enum machine_mode mode = VOIDmode;
enum machine_mode mode;
enum insn_code icode;
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
if (GET_MODE_SIZE (tmode) < max_size)
mode = tmode;
mode = widest_int_mode_for_size (max_size);
if (mode == VOIDmode)
break;
@ -2258,7 +2264,7 @@ can_store_by_pieces (unsigned HOST_WIDE_INT len,
unsigned HOST_WIDE_INT l;
unsigned int max_size;
HOST_WIDE_INT offset = 0;
enum machine_mode mode, tmode;
enum machine_mode mode;
enum insn_code icode;
int reverse;
/* cst is set but not used if LEGITIMATE_CONSTANT doesn't use it. */
@ -2272,22 +2278,7 @@ can_store_by_pieces (unsigned HOST_WIDE_INT len,
: STORE_BY_PIECES_P (len, align)))
return 0;
tmode = mode_for_size (STORE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
if (align >= GET_MODE_ALIGNMENT (tmode))
align = GET_MODE_ALIGNMENT (tmode);
else
{
enum machine_mode xmode;
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
tmode != VOIDmode;
xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
if (GET_MODE_SIZE (tmode) > STORE_MAX_PIECES
|| SLOW_UNALIGNED_ACCESS (tmode, align))
break;
align = MAX (align, GET_MODE_ALIGNMENT (xmode));
}
align = alignment_for_piecewise_move (STORE_MAX_PIECES, align);
/* We would first store what we can in the largest integer mode, then go to
successively smaller modes. */
@ -2297,14 +2288,10 @@ can_store_by_pieces (unsigned HOST_WIDE_INT len,
reverse++)
{
l = len;
mode = VOIDmode;
max_size = STORE_MAX_PIECES + 1;
while (max_size > 1)
{
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
if (GET_MODE_SIZE (tmode) < max_size)
mode = tmode;
mode = widest_int_mode_for_size (max_size);
if (mode == VOIDmode)
break;
@ -2445,7 +2432,6 @@ store_by_pieces_1 (struct store_by_pieces_d *data ATTRIBUTE_UNUSED,
= targetm.addr_space.address_mode (MEM_ADDR_SPACE (data->to));
rtx to_addr = XEXP (data->to, 0);
unsigned int max_size = STORE_MAX_PIECES + 1;
enum machine_mode mode = VOIDmode, tmode;
enum insn_code icode;
data->offset = 0;
@ -2466,11 +2452,11 @@ store_by_pieces_1 (struct store_by_pieces_d *data ATTRIBUTE_UNUSED,
if (!data->autinc_to
&& move_by_pieces_ninsns (data->len, align, max_size) > 2)
{
/* Determine the main mode we'll be using. */
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
if (GET_MODE_SIZE (tmode) < max_size)
mode = tmode;
/* Determine the main mode we'll be using.
MODE might not be used depending on the definitions of the
USE_* macros below. */
enum machine_mode mode ATTRIBUTE_UNUSED
= widest_int_mode_for_size (max_size);
if (USE_STORE_PRE_DECREMENT (mode) && data->reverse && ! data->autinc_to)
{
@ -2492,32 +2478,14 @@ store_by_pieces_1 (struct store_by_pieces_d *data ATTRIBUTE_UNUSED,
data->to_addr = copy_to_mode_reg (to_addr_mode, to_addr);
}
tmode = mode_for_size (STORE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
if (align >= GET_MODE_ALIGNMENT (tmode))
align = GET_MODE_ALIGNMENT (tmode);
else
{
enum machine_mode xmode;
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
tmode != VOIDmode;
xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
if (GET_MODE_SIZE (tmode) > STORE_MAX_PIECES
|| SLOW_UNALIGNED_ACCESS (tmode, align))
break;
align = MAX (align, GET_MODE_ALIGNMENT (xmode));
}
align = alignment_for_piecewise_move (STORE_MAX_PIECES, align);
/* First store what we can in the largest integer mode, then go to
successively smaller modes. */
while (max_size > 1)
{
for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
if (GET_MODE_SIZE (tmode) < max_size)
mode = tmode;
enum machine_mode mode = widest_int_mode_for_size (max_size);
if (mode == VOIDmode)
break;