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131
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1 /* A class for building vector rtx constants.
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145
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2 Copyright (C) 2017-2020 Free Software Foundation, Inc.
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131
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "tm.h"
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24 #include "rtl.h"
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25 #include "rtx-vector-builder.h"
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26
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27 /* Return a CONST_VECTOR for the current constant. V is an existing
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28 rtvec that contains all the elements. */
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29
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30 rtx
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31 rtx_vector_builder::build (rtvec v)
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32 {
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33 finalize ();
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34
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35 rtx x = find_cached_value ();
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36 if (x)
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37 return x;
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38
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39 x = gen_rtx_raw_CONST_VECTOR (m_mode, v);
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40 CONST_VECTOR_NPATTERNS (x) = npatterns ();
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41 CONST_VECTOR_NELTS_PER_PATTERN (x) = nelts_per_pattern ();
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42 return x;
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43 }
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44
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45 /* Return a vector element with the value BASE + FACTOR * STEP. */
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46
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47 rtx
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48 rtx_vector_builder::apply_step (rtx base, unsigned int factor,
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49 const wide_int &step) const
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50 {
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51 scalar_int_mode int_mode = as_a <scalar_int_mode> (GET_MODE_INNER (m_mode));
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52 return immed_wide_int_const (wi::add (rtx_mode_t (base, int_mode),
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53 factor * step),
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54 int_mode);
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55 }
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56
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57 /* Return a CONST_VECTOR for the current constant. */
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58
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59 rtx
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60 rtx_vector_builder::build ()
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61 {
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62 finalize ();
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63
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64 rtx x = find_cached_value ();
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65 if (x)
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66 return x;
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67
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68 unsigned int nelts;
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69 if (!GET_MODE_NUNITS (m_mode).is_constant (&nelts))
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70 nelts = encoded_nelts ();
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71 rtvec v = rtvec_alloc (nelts);
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72 for (unsigned int i = 0; i < nelts; ++i)
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73 RTVEC_ELT (v, i) = elt (i);
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74 x = gen_rtx_raw_CONST_VECTOR (m_mode, v);
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75 CONST_VECTOR_NPATTERNS (x) = npatterns ();
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76 CONST_VECTOR_NELTS_PER_PATTERN (x) = nelts_per_pattern ();
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77 return x;
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78 }
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79
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80 /* Check whether there is a global cached value for the vector.
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81 Return it if so, otherwise return null. */
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82
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83 rtx
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84 rtx_vector_builder::find_cached_value ()
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85 {
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86 if (encoded_nelts () != 1)
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87 return NULL_RTX;
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88
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89 rtx elt = (*this)[0];
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90
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91 if (GET_MODE_CLASS (m_mode) == MODE_VECTOR_BOOL)
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92 {
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93 if (elt == const1_rtx || elt == constm1_rtx)
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94 return CONST1_RTX (m_mode);
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95 else if (elt == const0_rtx)
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96 return CONST0_RTX (m_mode);
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97 else
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98 gcc_unreachable ();
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99 }
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100
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101 /* We can be called before the global vector constants are set up,
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102 but in that case we'll just return null. */
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103 scalar_mode inner_mode = GET_MODE_INNER (m_mode);
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104 if (elt == CONST0_RTX (inner_mode))
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105 return CONST0_RTX (m_mode);
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106 else if (elt == CONST1_RTX (inner_mode))
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107 return CONST1_RTX (m_mode);
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108 else if (elt == CONSTM1_RTX (inner_mode))
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109 return CONSTM1_RTX (m_mode);
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110
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111 return NULL_RTX;
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112 }
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