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 #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, rtx_vector_builder> 28 { 29 typedef vector_builder<rtx, rtx_vector_builder> parent; 30 friend class vector_builder<rtx, rtx_vector_builder>; 31 32 public: 33 rtx_vector_builder () : m_mode (VOIDmode) {} 34 rtx_vector_builder (machine_mode, unsigned int, unsigned int); 35 rtx build (rtvec); 36 rtx build (); 37 38 machine_mode mode () const { return m_mode; } 39 40 void new_vector (machine_mode, unsigned int, unsigned int); 41 42 private: 43 bool equal_p (rtx, rtx) const; 44 bool allow_steps_p () const; 45 bool integral_p (rtx) const; 46 wide_int step (rtx, rtx) const; 47 rtx apply_step (rtx, unsigned int, const wide_int &) const; 48 bool can_elide_p (rtx) const { return true; } 49 void note_representative (rtx *, rtx) {} 50 51 rtx find_cached_value (); 52 53 machine_mode m_mode; 54 }; 55 56 /* Create a new builder for a vector of mode MODE. Initially encode the 57 value as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements 58 each. */ 59 60 inline 61 rtx_vector_builder::rtx_vector_builder (machine_mode mode, 62 unsigned int npatterns, 63 unsigned int nelts_per_pattern) 64 { 65 new_vector (mode, npatterns, nelts_per_pattern); 66 } 67 68 /* Start building a new vector of mode MODE. Initially encode the value 69 as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements each. */ 70 71 inline void 72 rtx_vector_builder::new_vector (machine_mode mode, unsigned int npatterns, 73 unsigned int nelts_per_pattern) 74 { 75 m_mode = mode; 76 parent::new_vector (GET_MODE_NUNITS (mode), npatterns, nelts_per_pattern); 77 } 78 79 /* Return true if elements ELT1 and ELT2 are equal. */ 80 81 inline bool 82 rtx_vector_builder::equal_p (rtx elt1, rtx elt2) const 83 { 84 return rtx_equal_p (elt1, elt2); 85 } 86 87 /* Return true if a stepped representation is OK. We don't allow 88 linear series for anything other than integers, to avoid problems 89 with rounding. */ 90 91 inline bool 92 rtx_vector_builder::allow_steps_p () const 93 { 94 return is_a <scalar_int_mode> (GET_MODE_INNER (m_mode)); 95 } 96 97 /* Return true if element ELT can be interpreted as an integer. */ 98 99 inline bool 100 rtx_vector_builder::integral_p (rtx elt) const 101 { 102 return CONST_SCALAR_INT_P (elt); 103 } 104 105 /* Return the value of element ELT2 minus the value of element ELT1. 106 Both elements are known to be CONST_SCALAR_INT_Ps. */ 107 108 inline wide_int 109 rtx_vector_builder::step (rtx elt1, rtx elt2) const 110 { 111 return wi::sub (rtx_mode_t (elt2, GET_MODE_INNER (m_mode)), 112 rtx_mode_t (elt1, GET_MODE_INNER (m_mode))); 113 } 114 115 #endif 116