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rtlanal.c (lsb_bitfield_op_p): New predicate for bitfield operations from the least significant bit.

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2013-09-25  Yvan Roux  <yvan.roux@linaro.org>
	    Vladimir Makarov  <vmakarov@redhat.com>

	* rtlanal.c (lsb_bitfield_op_p): New predicate for bitfield operations
	from the least significant bit.
	(strip_address_mutations): Add bitfield operations handling.
	(must_be_index_p): Add shifting and rotate operations handling.
	(set_address_base): Use must_be_base_p predicate.
	(set_address_index):Use must_be_index_p predicate.


Co-Authored-By: Vladimir Makarov <vmakarov@redhat.com>

From-SVN: r202914
This commit is contained in:
Yvan Roux 2013-09-25 18:31:13 +00:00 committed by Yvan Roux
parent b86f6e9e46
commit 3936bafc7e
2 changed files with 41 additions and 5 deletions
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10
gcc/ChangeLog
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@ -1,3 +1,13 @@
2013-09-25 Yvan Roux <yvan.roux@linaro.org>
Vladimir Makarov <vmakarov@redhat.com>
* rtlanal.c (lsb_bitfield_op_p): New predicate for bitfield operations
from the least significant bit.
(strip_address_mutations): Add bitfield operations handling.
(must_be_index_p): Add shifting and rotate operations handling.
(set_address_base): Use must_be_base_p predicate.
(set_address_index):Use must_be_index_p predicate.
2013-09-25 Alexander Ivchenko <alexander.ivchenko@intel.com>
Maxim Kuznetsov <maxim.kuznetsov@intel.com>
Sergey Lega <sergey.s.lega@intel.com>

36
gcc/rtlanal.c
View File

@ -5467,12 +5467,29 @@ split_double (rtx value, rtx *first, rtx *second)
}
}
/* Return true if X is a sign_extract or zero_extract from the least
significant bit. */
static bool
lsb_bitfield_op_p (rtx x)
{
if (GET_RTX_CLASS (GET_CODE (x)) == RTX_BITFIELD_OPS)
{
enum machine_mode mode = GET_MODE (XEXP (x, 0));
unsigned HOST_WIDE_INT len = INTVAL (XEXP (x, 1));
HOST_WIDE_INT pos = INTVAL (XEXP (x, 2));
return (pos == (BITS_BIG_ENDIAN ? GET_MODE_PRECISION (mode) - len : 0));
}
return false;
}
/* Strip outer address "mutations" from LOC and return a pointer to the
inner value. If OUTER_CODE is nonnull, store the code of the innermost
stripped expression there.
"Mutations" either convert between modes or apply some kind of
alignment. */
extension, truncation or alignment. */
rtx *
strip_address_mutations (rtx *loc, enum rtx_code *outer_code)
@ -5484,6 +5501,10 @@ strip_address_mutations (rtx *loc, enum rtx_code *outer_code)
/* Things like SIGN_EXTEND, ZERO_EXTEND and TRUNCATE can be
used to convert between pointer sizes. */
loc = &XEXP (*loc, 0);
else if (lsb_bitfield_op_p (*loc))
/* A [SIGN|ZERO]_EXTRACT from the least significant bit effectively
acts as a combined truncation and extension. */
loc = &XEXP (*loc, 0);
else if (code == AND && CONST_INT_P (XEXP (*loc, 1)))
/* (and ... (const_int -X)) is used to align to X bytes. */
loc = &XEXP (*loc, 0);
@ -5513,7 +5534,13 @@ must_be_base_p (rtx x)
static bool
must_be_index_p (rtx x)
{
return GET_CODE (x) == MULT || GET_CODE (x) == ASHIFT;
return (GET_CODE (x) == MULT
|| GET_CODE (x) == ASHIFT
/* Needed by ARM targets. */
|| GET_CODE (x) == ASHIFTRT
|| GET_CODE (x) == LSHIFTRT
|| GET_CODE (x) == ROTATE
|| GET_CODE (x) == ROTATERT);
}
/* Set the segment part of address INFO to LOC, given that INNER is the
@ -5535,7 +5562,7 @@ set_address_segment (struct address_info *info, rtx *loc, rtx *inner)
static void
set_address_base (struct address_info *info, rtx *loc, rtx *inner)
{
if (GET_CODE (*inner) == LO_SUM)
if (must_be_base_p (*inner))
inner = strip_address_mutations (&XEXP (*inner, 0));
gcc_checking_assert (REG_P (*inner)
|| MEM_P (*inner)
@ -5552,8 +5579,7 @@ set_address_base (struct address_info *info, rtx *loc, rtx *inner)
static void
set_address_index (struct address_info *info, rtx *loc, rtx *inner)
{
if ((GET_CODE (*inner) == MULT || GET_CODE (*inner) == ASHIFT)
&& CONSTANT_P (XEXP (*inner, 1)))
if (must_be_index_p (*inner) && CONSTANT_P (XEXP (*inner, 1)))
inner = strip_address_mutations (&XEXP (*inner, 0));
gcc_checking_assert (REG_P (*inner)
|| MEM_P (*inner)