| /* Header for constant multiple table for TILEPro. |
| Copyright (C) 2011-2015 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_TILEPRO_MULTIPLY_H |
| #define GCC_TILEPRO_MULTIPLY_H |
| |
| /* A node of a tilepro_multiply_insn_seq, corresponding to a single |
| machine instruction such as 'add', 's1a', or an shl by a |
| constant. */ |
| struct tilepro_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 |
| tilepro_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 tilepro_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 tilepro_multiply_insn_seq |
| { |
| /* The constant factor by which this expression tree multiplies its |
| input. */ |
| int 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 tilepro_multiply_insn_seq_entry |
| op[tilepro_multiply_insn_seq_MAX_OPERATIONS]; |
| |
| }; |
| |
| /* A mapping from the compressed opcode to the corresponding enum |
| insn_code. */ |
| extern const enum insn_code tilepro_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 tilepro_multiply_insn_seq |
| tilepro_multiply_insn_seq_table[]; |
| |
| /* The number of elements in multiply_insn_seq_table. */ |
| extern const int tilepro_multiply_insn_seq_table_size; |
| |
| #endif /* !GCC_TILEPRO_MULTIPLY_H */ |