1cef8759bSmrg /* A class for building vector rtx constants.
2*4c3eb207Smrg Copyright (C) 2017-2020 Free Software Foundation, Inc.
3cef8759bSmrg
4cef8759bSmrg This file is part of GCC.
5cef8759bSmrg
6cef8759bSmrg GCC is free software; you can redistribute it and/or modify it under
7cef8759bSmrg the terms of the GNU General Public License as published by the Free
8cef8759bSmrg Software Foundation; either version 3, or (at your option) any later
9cef8759bSmrg version.
10cef8759bSmrg
11cef8759bSmrg GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12cef8759bSmrg WARRANTY; without even the implied warranty of MERCHANTABILITY or
13cef8759bSmrg FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14cef8759bSmrg for more details.
15cef8759bSmrg
16cef8759bSmrg You should have received a copy of the GNU General Public License
17cef8759bSmrg along with GCC; see the file COPYING3. If not see
18cef8759bSmrg <http://www.gnu.org/licenses/>. */
19cef8759bSmrg
20cef8759bSmrg #include "config.h"
21cef8759bSmrg #include "system.h"
22cef8759bSmrg #include "coretypes.h"
23cef8759bSmrg #include "tm.h"
24cef8759bSmrg #include "rtl.h"
25cef8759bSmrg #include "rtx-vector-builder.h"
26cef8759bSmrg
27cef8759bSmrg /* Return a CONST_VECTOR for the current constant. V is an existing
28cef8759bSmrg rtvec that contains all the elements. */
29cef8759bSmrg
30cef8759bSmrg rtx
build(rtvec v)31cef8759bSmrg rtx_vector_builder::build (rtvec v)
32cef8759bSmrg {
33cef8759bSmrg finalize ();
34cef8759bSmrg
35cef8759bSmrg rtx x = find_cached_value ();
36cef8759bSmrg if (x)
37cef8759bSmrg return x;
38cef8759bSmrg
39cef8759bSmrg x = gen_rtx_raw_CONST_VECTOR (m_mode, v);
40cef8759bSmrg CONST_VECTOR_NPATTERNS (x) = npatterns ();
41cef8759bSmrg CONST_VECTOR_NELTS_PER_PATTERN (x) = nelts_per_pattern ();
42cef8759bSmrg return x;
43cef8759bSmrg }
44cef8759bSmrg
45cef8759bSmrg /* Return a vector element with the value BASE + FACTOR * STEP. */
46cef8759bSmrg
47cef8759bSmrg rtx
apply_step(rtx base,unsigned int factor,const poly_wide_int & step)48cef8759bSmrg rtx_vector_builder::apply_step (rtx base, unsigned int factor,
49*4c3eb207Smrg const poly_wide_int &step) const
50cef8759bSmrg {
51cef8759bSmrg scalar_int_mode int_mode = as_a <scalar_int_mode> (GET_MODE_INNER (m_mode));
52*4c3eb207Smrg return immed_wide_int_const (wi::to_poly_wide (base, int_mode)
53*4c3eb207Smrg + factor * step,
54cef8759bSmrg int_mode);
55cef8759bSmrg }
56cef8759bSmrg
57cef8759bSmrg /* Return a CONST_VECTOR for the current constant. */
58cef8759bSmrg
59cef8759bSmrg rtx
build()60cef8759bSmrg rtx_vector_builder::build ()
61cef8759bSmrg {
62cef8759bSmrg finalize ();
63cef8759bSmrg
64cef8759bSmrg rtx x = find_cached_value ();
65cef8759bSmrg if (x)
66cef8759bSmrg return x;
67cef8759bSmrg
68cef8759bSmrg unsigned int nelts;
69cef8759bSmrg if (!GET_MODE_NUNITS (m_mode).is_constant (&nelts))
70cef8759bSmrg nelts = encoded_nelts ();
71cef8759bSmrg rtvec v = rtvec_alloc (nelts);
72cef8759bSmrg for (unsigned int i = 0; i < nelts; ++i)
73cef8759bSmrg RTVEC_ELT (v, i) = elt (i);
74cef8759bSmrg x = gen_rtx_raw_CONST_VECTOR (m_mode, v);
75cef8759bSmrg CONST_VECTOR_NPATTERNS (x) = npatterns ();
76cef8759bSmrg CONST_VECTOR_NELTS_PER_PATTERN (x) = nelts_per_pattern ();
77cef8759bSmrg return x;
78cef8759bSmrg }
79cef8759bSmrg
80cef8759bSmrg /* Check whether there is a global cached value for the vector.
81cef8759bSmrg Return it if so, otherwise return null. */
82cef8759bSmrg
83cef8759bSmrg rtx
find_cached_value()84cef8759bSmrg rtx_vector_builder::find_cached_value ()
85cef8759bSmrg {
86cef8759bSmrg if (encoded_nelts () != 1)
87cef8759bSmrg return NULL_RTX;
88cef8759bSmrg
89cef8759bSmrg rtx elt = (*this)[0];
90cef8759bSmrg
91cef8759bSmrg if (GET_MODE_CLASS (m_mode) == MODE_VECTOR_BOOL)
92cef8759bSmrg {
93cef8759bSmrg if (elt == const1_rtx || elt == constm1_rtx)
94cef8759bSmrg return CONST1_RTX (m_mode);
95cef8759bSmrg else if (elt == const0_rtx)
96cef8759bSmrg return CONST0_RTX (m_mode);
97cef8759bSmrg else
98cef8759bSmrg gcc_unreachable ();
99cef8759bSmrg }
100cef8759bSmrg
101cef8759bSmrg /* We can be called before the global vector constants are set up,
102cef8759bSmrg but in that case we'll just return null. */
103cef8759bSmrg scalar_mode inner_mode = GET_MODE_INNER (m_mode);
104cef8759bSmrg if (elt == CONST0_RTX (inner_mode))
105cef8759bSmrg return CONST0_RTX (m_mode);
106cef8759bSmrg else if (elt == CONST1_RTX (inner_mode))
107cef8759bSmrg return CONST1_RTX (m_mode);
108cef8759bSmrg else if (elt == CONSTM1_RTX (inner_mode))
109cef8759bSmrg return CONSTM1_RTX (m_mode);
110cef8759bSmrg
111cef8759bSmrg return NULL_RTX;
112cef8759bSmrg }
113