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combine.c i (set_nonzero_bits_and_sign_copies): Split code updating rsp->sign_bit_copies and rsp->nonzero_bits into ... 

2015-05-12  Thomas Preud'homme  <thomas.preudhomme@arm.com>

    * combine.c i(set_nonzero_bits_and_sign_copies): Split code updating
    rsp->sign_bit_copies and rsp->nonzero_bits into ...
    (update_rsp_from_reg_equal): This.  Also use REG_EQUAL note on src if
    present to get more accurate information about the number of sign bit
    copies and non zero bits.

From-SVN: r223034
This commit is contained in:
Thomas Preud'homme 2015-05-12 08:01:29 +00:00 committed by Thomas Preud'homme
parent dfc55d308e
commit 3a857fd0d3
2 changed files with 54 additions and 16 deletions
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8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2015-05-12 Thomas Preud'homme <thomas.preudhomme@arm.com>
* combine.c i(set_nonzero_bits_and_sign_copies): Split code updating
rsp->sign_bit_copies and rsp->nonzero_bits into ...
(update_rsp_from_reg_equal): This. Also use REG_EQUAL note on src if
present to get more accurate information about the number of sign bit
copies and non zero bits.
2015-05-12 Richard Biener <rguenther@suse.de>
* tree-vect-slp.c (vect_build_slp_tree_1): For BB vectorization

62
gcc/combine.c
View File

@ -1668,6 +1668,51 @@ sign_extend_short_imm (rtx src, machine_mode mode, unsigned int prec)
}
#endif
/* Update RSP for pseudo-register X from INSN's REG_EQUAL note (if one exists)
and SET. */
static void
update_rsp_from_reg_equal (reg_stat_type *rsp, rtx_insn *insn, const_rtx set,
rtx x)
{
rtx reg_equal_note = insn ? find_reg_equal_equiv_note (insn) : NULL_RTX;
unsigned HOST_WIDE_INT bits = 0;
rtx reg_equal = NULL, src = SET_SRC (set);
unsigned int num = 0;
if (reg_equal_note)
reg_equal = XEXP (reg_equal_note, 0);
#ifdef SHORT_IMMEDIATES_SIGN_EXTEND
src = sign_extend_short_imm (src, GET_MODE (x), BITS_PER_WORD);
if (reg_equal)
reg_equal = sign_extend_short_imm (reg_equal, GET_MODE (x), BITS_PER_WORD);
#endif
/* Don't call nonzero_bits if it cannot change anything. */
if (rsp->nonzero_bits != ~(unsigned HOST_WIDE_INT) 0)
{
bits = nonzero_bits (src, nonzero_bits_mode);
if (reg_equal && bits)
bits &= nonzero_bits (reg_equal, nonzero_bits_mode);
rsp->nonzero_bits |= bits;
}
/* Don't call num_sign_bit_copies if it cannot change anything. */
if (rsp->sign_bit_copies != 1)
{
num = num_sign_bit_copies (SET_SRC (set), GET_MODE (x));
if (reg_equal && num != GET_MODE_PRECISION (GET_MODE (x)))
{
unsigned int numeq = num_sign_bit_copies (reg_equal, GET_MODE (x));
if (num == 0 || numeq > num)
num = numeq;
}
if (rsp->sign_bit_copies == 0 || num < rsp->sign_bit_copies)
rsp->sign_bit_copies = num;
}
}
/* Called via note_stores. If X is a pseudo that is narrower than
HOST_BITS_PER_WIDE_INT and is being set, record what bits are known zero.
@ -1683,7 +1728,6 @@ static void
set_nonzero_bits_and_sign_copies (rtx x, const_rtx set, void *data)
{
rtx_insn *insn = (rtx_insn *) data;
unsigned int num;
if (REG_P (x)
&& REGNO (x) >= FIRST_PSEUDO_REGISTER
@ -1743,21 +1787,7 @@ set_nonzero_bits_and_sign_copies (rtx x, const_rtx set, void *data)
if (SET_DEST (set) == x
|| (paradoxical_subreg_p (SET_DEST (set))
&& SUBREG_REG (SET_DEST (set)) == x))
{
rtx src = SET_SRC (set);
#ifdef SHORT_IMMEDIATES_SIGN_EXTEND
src = sign_extend_short_imm (src, GET_MODE (x), BITS_PER_WORD);
#endif
/* Don't call nonzero_bits if it cannot change anything. */
if (rsp->nonzero_bits != ~(unsigned HOST_WIDE_INT) 0)
rsp->nonzero_bits |= nonzero_bits (src, nonzero_bits_mode);
num = num_sign_bit_copies (SET_SRC (set), GET_MODE (x));
if (rsp->sign_bit_copies == 0
|| rsp->sign_bit_copies > num)
rsp->sign_bit_copies = num;
}
update_rsp_from_reg_equal (rsp, insn, set, x);
else
{
rsp->nonzero_bits = GET_MODE_MASK (GET_MODE (x));