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comparison gcc/rtx-vector-builder.c @ 132:d34655255c78

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update gcc-8.2
author mir3636
date Thu, 25 Oct 2018 10:21:07 +0900
parents 84e7813d76e9
children 1830386684a0
comparison
equal deleted inserted replaced
130:e108057fa461 132:d34655255c78
1 /* A class for building vector rtx constants.
2 Copyright (C) 2017-2018 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
9 version.
10
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
19
20 #include "config.h"
21 #include "system.h"
22 #include "coretypes.h"
23 #include "tm.h"
24 #include "rtl.h"
25 #include "rtx-vector-builder.h"
26
27 /* Return a CONST_VECTOR for the current constant. V is an existing
28 rtvec that contains all the elements. */
29
30 rtx
31 rtx_vector_builder::build (rtvec v)
32 {
33 finalize ();
34
35 rtx x = find_cached_value ();
36 if (x)
37 return x;
38
39 x = gen_rtx_raw_CONST_VECTOR (m_mode, v);
40 CONST_VECTOR_NPATTERNS (x) = npatterns ();
41 CONST_VECTOR_NELTS_PER_PATTERN (x) = nelts_per_pattern ();
42 return x;
43 }
44
45 /* Return a vector element with the value BASE + FACTOR * STEP. */
46
47 rtx
48 rtx_vector_builder::apply_step (rtx base, unsigned int factor,
49 const wide_int &step) const
50 {
51 scalar_int_mode int_mode = as_a <scalar_int_mode> (GET_MODE_INNER (m_mode));
52 return immed_wide_int_const (wi::add (rtx_mode_t (base, int_mode),
53 factor * step),
54 int_mode);
55 }
56
57 /* Return a CONST_VECTOR for the current constant. */
58
59 rtx
60 rtx_vector_builder::build ()
61 {
62 finalize ();
63
64 rtx x = find_cached_value ();
65 if (x)
66 return x;
67
68 unsigned int nelts;
69 if (!GET_MODE_NUNITS (m_mode).is_constant (&nelts))
70 nelts = encoded_nelts ();
71 rtvec v = rtvec_alloc (nelts);
72 for (unsigned int i = 0; i < nelts; ++i)
73 RTVEC_ELT (v, i) = elt (i);
74 x = gen_rtx_raw_CONST_VECTOR (m_mode, v);
75 CONST_VECTOR_NPATTERNS (x) = npatterns ();
76 CONST_VECTOR_NELTS_PER_PATTERN (x) = nelts_per_pattern ();
77 return x;
78 }
79
80 /* Check whether there is a global cached value for the vector.
81 Return it if so, otherwise return null. */
82
83 rtx
84 rtx_vector_builder::find_cached_value ()
85 {
86 if (encoded_nelts () != 1)
87 return NULL_RTX;
88
89 rtx elt = (*this)[0];
90
91 if (GET_MODE_CLASS (m_mode) == MODE_VECTOR_BOOL)
92 {
93 if (elt == const1_rtx || elt == constm1_rtx)
94 return CONST1_RTX (m_mode);
95 else if (elt == const0_rtx)
96 return CONST0_RTX (m_mode);
97 else
98 gcc_unreachable ();
99 }
100
101 /* We can be called before the global vector constants are set up,
102 but in that case we'll just return null. */
103 scalar_mode inner_mode = GET_MODE_INNER (m_mode);
104 if (elt == CONST0_RTX (inner_mode))
105 return CONST0_RTX (m_mode);
106 else if (elt == CONST1_RTX (inner_mode))
107 return CONST1_RTX (m_mode);
108 else if (elt == CONSTM1_RTX (inner_mode))
109 return CONSTM1_RTX (m_mode);
110
111 return NULL_RTX;
112 }