153 lines
5.2 KiB
C++
153 lines
5.2 KiB
C++
/* A representation of vector permutation indices.
|
|
Copyright (C) 2017-2019 Free Software Foundation, Inc.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 3, or (at your option) any later
|
|
version.
|
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GCC; see the file COPYING3. If not see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef GCC_VEC_PERN_INDICES_H
|
|
#define GCC_VEC_PERN_INDICES_H 1
|
|
|
|
#include "int-vector-builder.h"
|
|
|
|
/* A vector_builder for building constant permutation vectors.
|
|
The elements do not need to be clamped to a particular range
|
|
of input elements. */
|
|
typedef int_vector_builder<poly_int64> vec_perm_builder;
|
|
|
|
/* This class represents a constant permutation vector, such as that used
|
|
as the final operand to a VEC_PERM_EXPR.
|
|
|
|
Permutation vectors select indices modulo the number of input elements,
|
|
and the class canonicalizes each permutation vector for a particular
|
|
number of input vectors and for a particular number of elements per
|
|
input. For example, the gimple statements:
|
|
|
|
_1 = VEC_PERM_EXPR <a, a, { 0, 2, 4, 6, 0, 2, 4, 6 }>;
|
|
_2 = VEC_PERM_EXPR <a, a, { 0, 2, 4, 6, 8, 10, 12, 14 }>;
|
|
_3 = VEC_PERM_EXPR <a, a, { 0, 2, 20, 22, 24, 2, 4, 14 }>;
|
|
|
|
effectively have only a single vector input "a". If "a" has 8
|
|
elements, the indices select elements modulo 8, which makes all three
|
|
VEC_PERM_EXPRs equivalent. The canonical form is for the indices to be
|
|
in the range [0, number of input elements - 1], so the class treats the
|
|
second and third permutation vectors as though they had been the first.
|
|
|
|
The class copes with cases in which the input and output vectors have
|
|
different numbers of elements. */
|
|
class vec_perm_indices
|
|
{
|
|
typedef poly_int64 element_type;
|
|
|
|
public:
|
|
vec_perm_indices ();
|
|
vec_perm_indices (const vec_perm_builder &, unsigned int, poly_uint64);
|
|
|
|
void new_vector (const vec_perm_builder &, unsigned int, poly_uint64);
|
|
void new_expanded_vector (const vec_perm_indices &, unsigned int);
|
|
void rotate_inputs (int delta);
|
|
|
|
/* Return the underlying vector encoding. */
|
|
const vec_perm_builder &encoding () const { return m_encoding; }
|
|
|
|
/* Return the number of output elements. This is called length ()
|
|
so that we present a more vec-like interface. */
|
|
poly_uint64 length () const { return m_encoding.full_nelts (); }
|
|
|
|
/* Return the number of input vectors being permuted. */
|
|
unsigned int ninputs () const { return m_ninputs; }
|
|
|
|
/* Return the number of elements in each input vector. */
|
|
poly_uint64 nelts_per_input () const { return m_nelts_per_input; }
|
|
|
|
/* Return the total number of input elements. */
|
|
poly_uint64 input_nelts () const { return m_ninputs * m_nelts_per_input; }
|
|
|
|
element_type clamp (element_type) const;
|
|
element_type operator[] (unsigned int i) const;
|
|
bool series_p (unsigned int, unsigned int, element_type, element_type) const;
|
|
bool all_in_range_p (element_type, element_type) const;
|
|
bool all_from_input_p (unsigned int) const;
|
|
|
|
private:
|
|
vec_perm_indices (const vec_perm_indices &);
|
|
|
|
vec_perm_builder m_encoding;
|
|
unsigned int m_ninputs;
|
|
poly_uint64 m_nelts_per_input;
|
|
};
|
|
|
|
bool tree_to_vec_perm_builder (vec_perm_builder *, tree);
|
|
tree vec_perm_indices_to_tree (tree, const vec_perm_indices &);
|
|
rtx vec_perm_indices_to_rtx (machine_mode, const vec_perm_indices &);
|
|
|
|
inline
|
|
vec_perm_indices::vec_perm_indices ()
|
|
: m_ninputs (0),
|
|
m_nelts_per_input (0)
|
|
{
|
|
}
|
|
|
|
/* Construct a permutation vector that selects between NINPUTS vector
|
|
inputs that have NELTS_PER_INPUT elements each. Take the elements of
|
|
the new vector from ELEMENTS, clamping each one to be in range. */
|
|
|
|
inline
|
|
vec_perm_indices::vec_perm_indices (const vec_perm_builder &elements,
|
|
unsigned int ninputs,
|
|
poly_uint64 nelts_per_input)
|
|
{
|
|
new_vector (elements, ninputs, nelts_per_input);
|
|
}
|
|
|
|
/* Return the canonical value for permutation vector element ELT,
|
|
taking into account the current number of input elements. */
|
|
|
|
inline vec_perm_indices::element_type
|
|
vec_perm_indices::clamp (element_type elt) const
|
|
{
|
|
element_type limit = input_nelts (), elem_within_input;
|
|
HOST_WIDE_INT input;
|
|
if (!can_div_trunc_p (elt, limit, &input, &elem_within_input))
|
|
return elt;
|
|
|
|
/* Treat negative elements as counting from the end. This only matters
|
|
if the vector size is not a power of 2. */
|
|
if (known_lt (elem_within_input, 0))
|
|
return elem_within_input + limit;
|
|
|
|
return elem_within_input;
|
|
}
|
|
|
|
/* Return the value of vector element I, which might or might not be
|
|
explicitly encoded. */
|
|
|
|
inline vec_perm_indices::element_type
|
|
vec_perm_indices::operator[] (unsigned int i) const
|
|
{
|
|
return clamp (m_encoding.elt (i));
|
|
}
|
|
|
|
/* Return true if the permutation vector only selects elements from
|
|
input I. */
|
|
|
|
inline bool
|
|
vec_perm_indices::all_from_input_p (unsigned int i) const
|
|
{
|
|
return all_in_range_p (i * m_nelts_per_input, m_nelts_per_input);
|
|
}
|
|
|
|
#endif
|