On Fri, Oct 23, 2015 at 12:23 PM, Ilya Enkovich <enkovich....@gmail.com> wrote:
> 2015-10-23 12:59 GMT+03:00 Richard Biener <richard.guent...@gmail.com>:
>>
>> ICK. So what does the above do? It basically preserves the boolean
>> condition
>> as "mask" unless ... we ought to swap it (formerly easy, just swap arguments
>> of the cond_expr, now a bit harder, we need to invert the condition). But I
>> don't understand the 'negate' dance. It looks like you want to have mask
>> not be bool != 0 or bool == 1 but just bool in this case. I suggest you
>> rework this to do sth like
>
> That's right, I want to avoid ==,!= comparisons with 0 and 1 by either
> using compared SSA_NAME
> or SSA_NAME != 0 (negate case).
>
>>
>> gimple_seq stmts = NULL;
>> gcc_assert (types_compatible_p (TREE_TYPE (cond), boolean_type_node));
>
> Is it really valid assert? Compiling fortran test with LTO I may have
> logical(kind=4) [aka 32bit boolean]
> type for cond and single bit _Bool for boolean_type_node.
I put it there to make sure it is because otherwise the use of boolean_type_node
below needs adjustment (boolean_true_node as well). TREE_TYPE (cond)
would work and constant_boolean_node (true, TREE_TYPE (cond)) for
boolean_type_node.
Yes, you are right.
>> if (TREE_CODE (cond) == SSA_NAME)
>> ;
>> else if (COMPARISON_CLASS_P (cond))
>> mask = gimple_build (&stmts, TREE_CODE (cond), boolean_type_node,
>> TREE_OPERAND (cond, 0), TREE_OPERAND (cond, 1));
>> else
>> gcc_unreachable ();
>> if (swap)
>> mask = gimple_build (&stmts, BIT_XOR_EXPR, boolean_type_node,
>> mask, boolean_true_node);
>> gsi_insert_seq_before (&gsi, stmts, GSI_SAME_STMT);
>>
>> which should do all of the above.
>
> Thus we would get smth like
>
> mask_1 = bool != 1
> mask_2 = mask_1 XOR 1
> _ifc_ = mask_2
No, we'd get
mask_1 = bool != 1;
and the 'mask' variable should have been simplified to 'bool'
(yes, we'd insert a dead stmt). gimple_build simplifies
stmts via the match-and-simplify machinery and match.pd
knows how to invert conditions.
> instead of
>
> _ifc_ = bool
>
> Note that cond is built to be used as a condition in COND_EXPR
> prepared for vectorization, i.e. it is always a comparison, thus
> comparison with 0 and 1 is quite a common case.
>
> Thanks,
> Ilya
>
>>
>> The rest of the changes look good to me.
>>
>> Thanks,
>> Richard.
>>
>>> /* Save mask and its size for further use. */
>>> vect_sizes.safe_push (bitsize);
>>> vect_masks.safe_push (mask);
>>> diff --git a/gcc/tree-vect-stmts.c b/gcc/tree-vect-stmts.c
>>> index 337ea7b..d6819ec 100644
>>> --- a/gcc/tree-vect-stmts.c
>>> +++ b/gcc/tree-vect-stmts.c
>>> @@ -1800,6 +1800,7 @@ vectorizable_mask_load_store (gimple *stmt,
>>> gimple_stmt_iterator *gsi,
>>> bool nested_in_vect_loop = nested_in_vect_loop_p (loop, stmt);
>>> struct data_reference *dr = STMT_VINFO_DATA_REF (stmt_info);
>>> tree vectype = STMT_VINFO_VECTYPE (stmt_info);
>>> + tree mask_vectype;
>>> tree elem_type;
>>> gimple *new_stmt;
>>> tree dummy;
>>> @@ -1827,8 +1828,8 @@ vectorizable_mask_load_store (gimple *stmt,
>>> gimple_stmt_iterator *gsi,
>>>
>>> is_store = gimple_call_internal_fn (stmt) == IFN_MASK_STORE;
>>> mask = gimple_call_arg (stmt, 2);
>>> - if (TYPE_PRECISION (TREE_TYPE (mask))
>>> - != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (vectype))))
>>> +
>>> + if (TREE_CODE (TREE_TYPE (mask)) != BOOLEAN_TYPE)
>>> return false;
>>>
>>> /* FORNOW. This restriction should be relaxed. */
>>> @@ -1857,6 +1858,19 @@ vectorizable_mask_load_store (gimple *stmt,
>>> gimple_stmt_iterator *gsi,
>>> if (STMT_VINFO_STRIDED_P (stmt_info))
>>> return false;
>>>
>>> + if (TREE_CODE (mask) != SSA_NAME)
>>> + return false;
>>> +
>>> + if (!vect_is_simple_use_1 (mask, stmt, loop_vinfo, NULL,
>>> + &def_stmt, &def, &dt, &mask_vectype))
>>> + return false;
>>> +
>>> + if (!mask_vectype)
>>> + mask_vectype = get_mask_type_for_scalar_type (TREE_TYPE (vectype));
>>> +
>>> + if (!mask_vectype)
>>> + return false;
>>> +
>>> if (STMT_VINFO_GATHER_SCATTER_P (stmt_info))
>>> {
>>> gimple *def_stmt;
>>> @@ -1890,14 +1904,9 @@ vectorizable_mask_load_store (gimple *stmt,
>>> gimple_stmt_iterator *gsi,
>>> : DR_STEP (dr), size_zero_node) <= 0)
>>> return false;
>>> else if (!VECTOR_MODE_P (TYPE_MODE (vectype))
>>> - || !can_vec_mask_load_store_p (TYPE_MODE (vectype), !is_store))
>>> - return false;
>>> -
>>> - if (TREE_CODE (mask) != SSA_NAME)
>>> - return false;
>>> -
>>> - if (!vect_is_simple_use (mask, stmt, loop_vinfo, NULL,
>>> - &def_stmt, &def, &dt))
>>> + || !can_vec_mask_load_store_p (TYPE_MODE (vectype),
>>> + TYPE_MODE (mask_vectype),
>>> + !is_store))
>>> return false;
>>>
>>> if (is_store)
