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/* A class for building vector rtx constants.
Copyright (C) 2017-2018 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_RTX_VECTOR_BUILDER_H
#define GCC_RTX_VECTOR_BUILDER_H
#include "vector-builder.h"
/* This class is used to build VECTOR_CSTs from a sequence of elements.
See vector_builder for more details. */
class rtx_vector_builder : public vector_builder<rtx, rtx_vector_builder>
{
typedef vector_builder<rtx, rtx_vector_builder> parent;
friend class vector_builder<rtx, rtx_vector_builder>;
public:
rtx_vector_builder () : m_mode (VOIDmode) {}
rtx_vector_builder (machine_mode, unsigned int, unsigned int);
rtx build (rtvec);
rtx build ();
machine_mode mode () const { return m_mode; }
void new_vector (machine_mode, unsigned int, unsigned int);
private:
bool equal_p (rtx, rtx) const;
bool allow_steps_p () const;
bool integral_p (rtx) const;
wide_int step (rtx, rtx) const;
rtx apply_step (rtx, unsigned int, const wide_int &) const;
bool can_elide_p (rtx) const { return true; }
void note_representative (rtx *, rtx) {}
rtx find_cached_value ();
machine_mode m_mode;
};
/* Create a new builder for a vector of mode MODE. Initially encode the
value as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements
each. */
inline
rtx_vector_builder::rtx_vector_builder (machine_mode mode,
unsigned int npatterns,
unsigned int nelts_per_pattern)
{
new_vector (mode, npatterns, nelts_per_pattern);
}
/* Start building a new vector of mode MODE. Initially encode the value
as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements each. */
inline void
rtx_vector_builder::new_vector (machine_mode mode, unsigned int npatterns,
unsigned int nelts_per_pattern)
{
m_mode = mode;
parent::new_vector (GET_MODE_NUNITS (mode), npatterns, nelts_per_pattern);
}
/* Return true if elements ELT1 and ELT2 are equal. */
inline bool
rtx_vector_builder::equal_p (rtx elt1, rtx elt2) const
{
return rtx_equal_p (elt1, elt2);
}
/* Return true if a stepped representation is OK. We don't allow
linear series for anything other than integers, to avoid problems
with rounding. */
inline bool
rtx_vector_builder::allow_steps_p () const
{
return is_a <scalar_int_mode> (GET_MODE_INNER (m_mode));
}
/* Return true if element ELT can be interpreted as an integer. */
inline bool
rtx_vector_builder::integral_p (rtx elt) const
{
return CONST_SCALAR_INT_P (elt);
}
/* Return the value of element ELT2 minus the value of element ELT1.
Both elements are known to be CONST_SCALAR_INT_Ps. */
inline wide_int
rtx_vector_builder::step (rtx elt1, rtx elt2) const
{
return wi::sub (rtx_mode_t (elt2, GET_MODE_INNER (m_mode)),
rtx_mode_t (elt1, GET_MODE_INNER (m_mode)));
}
#endif
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