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tree-vect-transform.c (vect_min_worthwhile_factor): Declare.

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* tree-vect-transform.c (vect_min_worthwhile_factor): Declare.
        (vect_create_epilog_for_reduction): Don't use vec_shr if the
        operation is emulated.
        (vectorizable_reduction): Duplicate vect_min_worthwhile_factor
        tests from vectorizable_operation.

From-SVN: r101433
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Richard Henderson 2005-06-29 11:13:27 -07:00 committed by Richard Henderson
parent affb0e06f4
commit afc1ab6196
2 changed files with 39 additions and 0 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2005-06-29 Richard Henderson <rth@redhat.com>
* tree-vect-transform.c (vect_min_worthwhile_factor): Declare.
(vect_create_epilog_for_reduction): Don't use vec_shr if the
operation is emulated.
(vectorizable_reduction): Duplicate vect_min_worthwhile_factor
tests from vectorizable_operation.
2005-06-29 Caroline Tice <ctice@apple.com>
Fix PR 21956

31
gcc/tree-vect-transform.c
View File

@ -72,6 +72,7 @@ static void vect_update_inits_of_drs (loop_vec_info, tree);
static void vect_do_peeling_for_alignment (loop_vec_info, struct loops *);
static void vect_do_peeling_for_loop_bound
(loop_vec_info, tree *, struct loops *);
static int vect_min_worthwhile_factor (enum tree_code);
/* Function vect_get_new_vect_var.
@ -940,6 +941,21 @@ vect_create_epilog_for_reduction (tree vect_def, tree stmt, tree reduction_op,
else
have_whole_vector_shift = false;
/* Regardless of whether we have a whole vector shift, if we're
emulating the operation via tree-vect-generic, we don't want
to use it. Only the first round of the reduction is likely
to still be profitable via emulation. */
/* ??? It might be better to emit a reduction tree code here, so that
tree-vect-generic can expand the first round via bit tricks. */
if (!VECTOR_MODE_P (mode))
have_whole_vector_shift = false;
else
{
optab optab = optab_for_tree_code (code, vectype);
if (optab->handlers[mode].insn_code == CODE_FOR_nothing)
have_whole_vector_shift = false;
}
if (have_whole_vector_shift)
{
/*** Case 2:
@ -1211,6 +1227,21 @@ vectorizable_reduction (tree stmt, block_stmt_iterator *bsi, tree *vec_stmt)
{
if (vect_print_dump_info (REPORT_DETAILS, UNKNOWN_LOC))
fprintf (vect_dump, "op not supported by target.");
if (GET_MODE_SIZE (vec_mode) != UNITS_PER_WORD
|| LOOP_VINFO_VECT_FACTOR (loop_vinfo)
< vect_min_worthwhile_factor (code))
return false;
if (vect_print_dump_info (REPORT_DETAILS, UNKNOWN_LOC))
fprintf (vect_dump, "proceeding using word mode.");
}
/* Worthwhile without SIMD support? */
if (!VECTOR_MODE_P (TYPE_MODE (vectype))
&& LOOP_VINFO_VECT_FACTOR (loop_vinfo)
< vect_min_worthwhile_factor (code))
{
if (vect_print_dump_info (REPORT_DETAILS, UNKNOWN_LOC))
fprintf (vect_dump, "not worthwhile without SIMD support.");
return false;
}