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/* A class for building vector rtx constants.
Copyright (C) 2017-2023 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/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "rtx-vector-builder.h"
/* Return a CONST_VECTOR for the current constant. V is an existing
rtvec that contains all the elements. */
rtx
rtx_vector_builder::build (rtvec v)
{
finalize ();
rtx x = find_cached_value ();
if (x)
return x;
x = gen_rtx_raw_CONST_VECTOR (m_mode, v);
CONST_VECTOR_NPATTERNS (x) = npatterns ();
CONST_VECTOR_NELTS_PER_PATTERN (x) = nelts_per_pattern ();
return x;
}
/* Return a vector element with the value BASE + FACTOR * STEP. */
rtx
rtx_vector_builder::apply_step (rtx base, unsigned int factor,
const poly_wide_int &step) const
{
scalar_int_mode int_mode = as_a <scalar_int_mode> (GET_MODE_INNER (m_mode));
return immed_wide_int_const (wi::to_poly_wide (base, int_mode)
+ factor * step,
int_mode);
}
/* Return a CONST_VECTOR for the current constant. */
rtx
rtx_vector_builder::build ()
{
finalize ();
rtx x = find_cached_value ();
if (x)
return x;
unsigned int nelts;
if (!GET_MODE_NUNITS (m_mode).is_constant (&nelts))
nelts = encoded_nelts ();
rtvec v = rtvec_alloc (nelts);
for (unsigned int i = 0; i < nelts; ++i)
RTVEC_ELT (v, i) = elt (i);
x = gen_rtx_raw_CONST_VECTOR (m_mode, v);
CONST_VECTOR_NPATTERNS (x) = npatterns ();
CONST_VECTOR_NELTS_PER_PATTERN (x) = nelts_per_pattern ();
return x;
}
/* Check whether there is a global cached value for the vector.
Return it if so, otherwise return null. */
rtx
rtx_vector_builder::find_cached_value ()
{
if (encoded_nelts () != 1)
return NULL_RTX;
rtx elt = (*this)[0];
if (GET_MODE_CLASS (m_mode) == MODE_VECTOR_BOOL)
{
if (elt == const1_rtx)
return CONST1_RTX (m_mode);
else if (elt == constm1_rtx)
return CONSTM1_RTX (m_mode);
else if (elt == const0_rtx)
return CONST0_RTX (m_mode);
else
gcc_unreachable ();
}
/* We can be called before the global vector constants are set up,
but in that case we'll just return null. */
scalar_mode inner_mode = GET_MODE_INNER (m_mode);
if (elt == CONST0_RTX (inner_mode))
return CONST0_RTX (m_mode);
else if (elt == CONST1_RTX (inner_mode))
return CONST1_RTX (m_mode);
else if (elt == CONSTM1_RTX (inner_mode))
return CONSTM1_RTX (m_mode);
return NULL_RTX;
}
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