gnu / gcc / 730f52e05a1fb5c8cd92e352e9b191a6332be5c2 / . / gcc / config / tilegx / tilegx-multiply.h

/* Header for constant multiple table for TILE-Gx. | |

Copyright (C) 2011-2021 Free Software Foundation, Inc. | |

Contributed by Walter Lee (walt@tilera.com) | |

This file is part of GCC. | |

GCC is free software; you can redistribute it and/or modify it | |

under the terms of the GNU General Public License as published | |

by the Free Software Foundation; either version 3, or (at your | |

option) any later version. | |

GCC is distributed in the hope that it will be useful, but WITHOUT | |

ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |

or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |

License for more details. | |

You should have received a copy of the GNU General Public License | |

along with GCC; see the file COPYING3. If not see | |

<http://www.gnu.org/licenses/>. */ | |

#ifndef GCC_TILEGX_MULTIPLY_H | |

#define GCC_TILEGX_MULTIPLY_H | |

/* A node of a tilegx_multiply_insn_seq, corresponding to a single | |

machine instruction such as 'add', 's1a', or an shl by a constant. */ | |

struct tilegx_multiply_insn_seq_entry | |

{ | |

/* Which operation this node performs (e.g. an add or sub). | |

Don't use this directly, call get_opcode() table to get a insn_code. */ | |

unsigned char compressed_opcode; | |

/* The left-hand side of this expression tree. | |

If equal to 0, it refers to 'zero'. | |

If equal to 1, it refers to the original input to the multiply operation. | |

Otherwise, subtract two and it is an index into the containing | |

tilegx_multiply_insn_seq's 'op' array. Since it can only point to some | |

value that has already been computed it will always point to an | |

earlier entry in the array. */ | |

unsigned char lhs; | |

/* This is like lhs, but for the right-hand side. However, for shift | |

opcodes this is a shift count rather than an operand index. */ | |

unsigned char rhs; | |

}; | |

/* Maximum size of op array. */ | |

#define tilegx_multiply_insn_seq_MAX_OPERATIONS 4 | |

/* This defines a DAG describing how to multiply by a constant in | |

terms of one or more machine instructions. */ | |

struct tilegx_multiply_insn_seq | |

{ | |

/* The constant factor by which this expression tree multiplies its input. */ | |

long long multiplier; | |

/* The nodes of the parse tree. These are ordered so that instructions | |

can be emitted in the same order that they appear in this array. | |

Entry entry in this array can only refer to earlier entries in | |

the array. */ | |

struct tilegx_multiply_insn_seq_entry | |

op[tilegx_multiply_insn_seq_MAX_OPERATIONS]; | |

}; | |

/* A mapping from the compressed opcode to the corresponding enum | |

insn_code. */ | |

extern const enum insn_code tilegx_multiply_insn_seq_decode_opcode[]; | |

/* Table mapping constant int multipliers to an expression | |

tree that efficiently performs that multiplication. | |

This is sorted by its 'multiplier' field so a binary search | |

can look for matches. */ | |

extern const struct tilegx_multiply_insn_seq tilegx_multiply_insn_seq_table[]; | |

/* The number of elements in multiply_insn_seq_table. */ | |

extern const int tilegx_multiply_insn_seq_table_size; | |

#endif /* !GCC_TILEGX_MULTIPLY_H */ |