1 /* A class for building vector rtx constants. 2 Copyright (C) 2017-2020 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 #ifndef GCC_RTX_VECTOR_BUILDER_H 21 #define GCC_RTX_VECTOR_BUILDER_H 22 23 #include "vector-builder.h" 24 25 /* This class is used to build VECTOR_CSTs from a sequence of elements. 26 See vector_builder for more details. */ 27 class rtx_vector_builder : public vector_builder<rtx, machine_mode, 28 rtx_vector_builder> 29 { 30 typedef vector_builder<rtx, machine_mode, rtx_vector_builder> parent; 31 friend class vector_builder<rtx, machine_mode, rtx_vector_builder>; 32 33 public: 34 rtx_vector_builder () : m_mode (VOIDmode) {} 35 rtx_vector_builder (machine_mode, unsigned int, unsigned int); 36 rtx build (rtvec); 37 rtx build (); 38 39 machine_mode mode () const { return m_mode; } 40 41 void new_vector (machine_mode, unsigned int, unsigned int); 42 43 private: 44 bool equal_p (rtx, rtx) const; 45 bool allow_steps_p () const; 46 bool integral_p (rtx) const; 47 poly_wide_int step (rtx, rtx) const; 48 rtx apply_step (rtx, unsigned int, const poly_wide_int &) const; 49 bool can_elide_p (rtx) const { return true; } 50 void note_representative (rtx *, rtx) {} 51 52 static poly_uint64 shape_nelts (machine_mode mode) 53 { return GET_MODE_NUNITS (mode); } 54 static poly_uint64 nelts_of (const_rtx x) 55 { return CONST_VECTOR_NUNITS (x); } 56 static unsigned int npatterns_of (const_rtx x) 57 { return CONST_VECTOR_NPATTERNS (x); } 58 static unsigned int nelts_per_pattern_of (const_rtx x) 59 { return CONST_VECTOR_NELTS_PER_PATTERN (x); } 60 61 rtx find_cached_value (); 62 63 machine_mode m_mode; 64 }; 65 66 /* Create a new builder for a vector of mode MODE. Initially encode the 67 value as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements 68 each. */ 69 70 inline 71 rtx_vector_builder::rtx_vector_builder (machine_mode mode, 72 unsigned int npatterns, 73 unsigned int nelts_per_pattern) 74 { 75 new_vector (mode, npatterns, nelts_per_pattern); 76 } 77 78 /* Start building a new vector of mode MODE. Initially encode the value 79 as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements each. */ 80 81 inline void 82 rtx_vector_builder::new_vector (machine_mode mode, unsigned int npatterns, 83 unsigned int nelts_per_pattern) 84 { 85 m_mode = mode; 86 parent::new_vector (GET_MODE_NUNITS (mode), npatterns, nelts_per_pattern); 87 } 88 89 /* Return true if elements ELT1 and ELT2 are equal. */ 90 91 inline bool 92 rtx_vector_builder::equal_p (rtx elt1, rtx elt2) const 93 { 94 return rtx_equal_p (elt1, elt2); 95 } 96 97 /* Return true if a stepped representation is OK. We don't allow 98 linear series for anything other than integers, to avoid problems 99 with rounding. */ 100 101 inline bool 102 rtx_vector_builder::allow_steps_p () const 103 { 104 return is_a <scalar_int_mode> (GET_MODE_INNER (m_mode)); 105 } 106 107 /* Return true if element ELT can be interpreted as an integer. */ 108 109 inline bool 110 rtx_vector_builder::integral_p (rtx elt) const 111 { 112 return CONST_SCALAR_INT_P (elt); 113 } 114 115 /* Return the value of element ELT2 minus the value of element ELT1. 116 Both elements are known to be CONST_SCALAR_INT_Ps. */ 117 118 inline poly_wide_int 119 rtx_vector_builder::step (rtx elt1, rtx elt2) const 120 { 121 return (wi::to_poly_wide (elt2, GET_MODE_INNER (m_mode)) 122 - wi::to_poly_wide (elt1, GET_MODE_INNER (m_mode))); 123 } 124 125 #endif 126