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[Vectorizer]Make reductions-via-shifts and vec_shr_optab endianness-neutral 

* optabs.c (shift_amt_for_vec_perm_mask): Remove code conditional on
        BYTES_BIG_ENDIAN.
        * tree-vect-loop.c (calc_vec_perm_mask_for_shift,
        vect_create_epilog_for_reduction): Likewise.
        * doc/md.texi (vec_shr_m): Clarify direction of shifting.

From-SVN: r217550
This commit is contained in:
Alan Lawrence 2014-11-14 10:48:34 +00:00 committed by Alan Lawrence
parent 8261494856
commit 729ff76e2b
4 changed files with 13 additions and 13 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2014-11-13 Alan Lawrence <alan.lawrence@arm.com>
* optabs.c (shift_amt_for_vec_perm_mask): Remove code conditional on
BYTES_BIG_ENDIAN.
* tree-vect-loop.c (calc_vec_perm_mask_for_shift,
vect_create_epilog_for_reduction): Likewise.
* doc/md.texi (vec_shr_m): Clarify direction of shifting.
2014-11-14 Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
PR target/63724

2
gcc/doc/md.texi
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@ -4798,7 +4798,7 @@ of a wider mode.)
@cindex @code{vec_shr_@var{m}} instruction pattern
@item @samp{vec_shr_@var{m}}
Whole vector right shift in bits.
Whole vector right shift in bits, i.e. towards element 0.
Operand 1 is a vector to be shifted.
Operand 2 is an integer shift amount in bits.
Operand 0 is where the resulting shifted vector is stored.

2
gcc/optabs.c
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@ -6618,8 +6618,6 @@ shift_amt_for_vec_perm_mask (rtx sel)
return NULL_RTX;
}
if (BYTES_BIG_ENDIAN)
first = (2 * nelt) - first;
return GEN_INT (first * bitsize);
}

14
gcc/tree-vect-loop.c
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@ -3092,7 +3092,7 @@ calc_vec_perm_mask_for_shift (enum machine_mode mode, unsigned int offset,
unsigned int i, nelt = GET_MODE_NUNITS (mode);
for (i = 0; i < nelt; i++)
sel[i] = (BYTES_BIG_ENDIAN ? i - offset : i + offset) & (2*nelt - 1);
sel[i] = (i + offset) & (2*nelt - 1);
}
/* Checks whether the target supports whole-vector shifts for vectors of mode
@ -3907,7 +3907,7 @@ vect_create_epilog_for_reduction (vec<tree> vect_defs, gimple stmt,
gimple epilog_stmt = NULL;
enum tree_code code = gimple_assign_rhs_code (stmt);
gimple exit_phi;
tree bitsize, bitpos;
tree bitsize;
tree adjustment_def = NULL;
tree vec_initial_def = NULL;
tree reduction_op, expr, def;
@ -4417,14 +4417,8 @@ vect_create_epilog_for_reduction (vec<tree> vect_defs, gimple stmt,
dump_printf_loc (MSG_NOTE, vect_location,
"extract scalar result\n");
if (BYTES_BIG_ENDIAN)
bitpos = size_binop (MULT_EXPR,
bitsize_int (TYPE_VECTOR_SUBPARTS (vectype) - 1),
TYPE_SIZE (scalar_type));
else
bitpos = bitsize_zero_node;
rhs = build3 (BIT_FIELD_REF, scalar_type, new_temp, bitsize, bitpos);
rhs = build3 (BIT_FIELD_REF, scalar_type,
new_temp, bitsize, bitsize_zero_node);
epilog_stmt = gimple_build_assign (new_scalar_dest, rhs);
new_temp = make_ssa_name (new_scalar_dest, epilog_stmt);
gimple_assign_set_lhs (epilog_stmt, new_temp);