| /* A class for building vector rtx constants. |
| 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/>. */ |
| |
| #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 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::add (rtx_mode_t (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 || elt == constm1_rtx) |
| return CONST1_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; |
| } |