1 /* Fixed-point arithmetic support. 2 Copyright (C) 2006-2013 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_FIXED_VALUE_H 21 #define GCC_FIXED_VALUE_H 22 23 #include "machmode.h" 24 #include "real.h" 25 #include "double-int.h" 26 27 struct GTY(()) fixed_value 28 { 29 double_int data; /* Store data up to 2 wide integers. */ 30 enum machine_mode mode; /* Use machine mode to know IBIT and FBIT. */ 31 }; 32 33 #define FIXED_VALUE_TYPE struct fixed_value 34 35 #define MAX_FCONST0 18 /* For storing 18 fixed-point zeros per 36 fract, ufract, accum, and uaccum modes . */ 37 #define MAX_FCONST1 8 /* For storing 8 fixed-point ones per accum 38 and uaccum modes. */ 39 /* Constant fixed-point values 0 and 1. */ 40 extern FIXED_VALUE_TYPE fconst0[MAX_FCONST0]; 41 extern FIXED_VALUE_TYPE fconst1[MAX_FCONST1]; 42 43 /* Macros to access fconst0 and fconst1 via machine modes. */ 44 #define FCONST0(mode) fconst0[mode - QQmode] 45 #define FCONST1(mode) fconst1[mode - HAmode] 46 47 /* Return a CONST_FIXED with value R and mode M. */ 48 #define CONST_FIXED_FROM_FIXED_VALUE(r, m) \ 49 const_fixed_from_fixed_value (r, m) 50 extern rtx const_fixed_from_fixed_value (FIXED_VALUE_TYPE, enum machine_mode); 51 52 /* Construct a FIXED_VALUE from a bit payload and machine mode MODE. 53 The bits in PAYLOAD are sign-extended/zero-extended according to MODE. */ 54 extern FIXED_VALUE_TYPE fixed_from_double_int (double_int, 55 enum machine_mode); 56 57 /* Return a CONST_FIXED from a bit payload and machine mode MODE. 58 The bits in PAYLOAD are sign-extended/zero-extended according to MODE. */ 59 static inline rtx 60 const_fixed_from_double_int (double_int payload, 61 enum machine_mode mode) 62 { 63 return 64 const_fixed_from_fixed_value (fixed_from_double_int (payload, mode), 65 mode); 66 } 67 68 /* Initialize from a decimal or hexadecimal string. */ 69 extern void fixed_from_string (FIXED_VALUE_TYPE *, const char *, 70 enum machine_mode); 71 72 /* In tree.c: wrap up a FIXED_VALUE_TYPE in a tree node. */ 73 extern tree build_fixed (tree, FIXED_VALUE_TYPE); 74 75 /* Extend or truncate to a new mode. */ 76 extern bool fixed_convert (FIXED_VALUE_TYPE *, enum machine_mode, 77 const FIXED_VALUE_TYPE *, bool); 78 79 /* Convert to a fixed-point mode from an integer. */ 80 extern bool fixed_convert_from_int (FIXED_VALUE_TYPE *, enum machine_mode, 81 double_int, bool, bool); 82 83 /* Convert to a fixed-point mode from a real. */ 84 extern bool fixed_convert_from_real (FIXED_VALUE_TYPE *, enum machine_mode, 85 const REAL_VALUE_TYPE *, bool); 86 87 /* Convert to a real mode from a fixed-point. */ 88 extern void real_convert_from_fixed (REAL_VALUE_TYPE *, enum machine_mode, 89 const FIXED_VALUE_TYPE *); 90 91 /* Compare two fixed-point objects for bitwise identity. */ 92 extern bool fixed_identical (const FIXED_VALUE_TYPE *, const FIXED_VALUE_TYPE *); 93 94 /* Calculate a hash value. */ 95 extern unsigned int fixed_hash (const FIXED_VALUE_TYPE *); 96 97 #define FIXED_VALUES_IDENTICAL(x, y) fixed_identical (&(x), &(y)) 98 99 /* Determine whether a fixed-point value X is negative. */ 100 #define FIXED_VALUE_NEGATIVE(x) fixed_isneg (&(x)) 101 102 /* Render F as a decimal floating point constant. */ 103 extern void fixed_to_decimal (char *str, const FIXED_VALUE_TYPE *, size_t); 104 105 /* Binary or unary arithmetic on tree_code. */ 106 extern bool fixed_arithmetic (FIXED_VALUE_TYPE *, int, const FIXED_VALUE_TYPE *, 107 const FIXED_VALUE_TYPE *, bool); 108 109 /* Compare fixed-point values by tree_code. */ 110 extern bool fixed_compare (int, const FIXED_VALUE_TYPE *, 111 const FIXED_VALUE_TYPE *); 112 113 /* Determine whether a fixed-point value X is negative. */ 114 extern bool fixed_isneg (const FIXED_VALUE_TYPE *); 115 116 #endif /* GCC_FIXED_VALUE_H */ 117
