112 lines
4.1 KiB
C
112 lines
4.1 KiB
C
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/* Fixed-point arithmetic support.
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Copyright (C) 2006-2019 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_FIXED_VALUE_H
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#define GCC_FIXED_VALUE_H
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struct GTY(()) fixed_value
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{
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double_int data; /* Store data up to 2 wide integers. */
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scalar_mode_pod mode; /* Use machine mode to know IBIT and FBIT. */
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};
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#define FIXED_VALUE_TYPE struct fixed_value
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#define MAX_FCONST0 18 /* For storing 18 fixed-point zeros per
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fract, ufract, accum, and uaccum modes . */
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#define MAX_FCONST1 8 /* For storing 8 fixed-point ones per accum
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and uaccum modes. */
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/* Constant fixed-point values 0 and 1. */
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extern FIXED_VALUE_TYPE fconst0[MAX_FCONST0];
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extern FIXED_VALUE_TYPE fconst1[MAX_FCONST1];
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/* Macros to access fconst0 and fconst1 via machine modes. */
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#define FCONST0(mode) fconst0[mode - QQmode]
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#define FCONST1(mode) fconst1[mode - HAmode]
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/* Return a CONST_FIXED with value R and mode M. */
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#define CONST_FIXED_FROM_FIXED_VALUE(r, m) \
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const_fixed_from_fixed_value (r, m)
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extern rtx const_fixed_from_fixed_value (FIXED_VALUE_TYPE, machine_mode);
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/* Construct a FIXED_VALUE from a bit payload and machine mode MODE.
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The bits in PAYLOAD are sign-extended/zero-extended according to MODE. */
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extern FIXED_VALUE_TYPE fixed_from_double_int (double_int, scalar_mode);
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/* Return a CONST_FIXED from a bit payload and machine mode MODE.
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The bits in PAYLOAD are sign-extended/zero-extended according to MODE. */
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static inline rtx
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const_fixed_from_double_int (double_int payload,
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scalar_mode mode)
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{
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return
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const_fixed_from_fixed_value (fixed_from_double_int (payload, mode),
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mode);
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}
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/* Initialize from a decimal or hexadecimal string. */
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extern void fixed_from_string (FIXED_VALUE_TYPE *, const char *,
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scalar_mode);
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/* In tree.c: wrap up a FIXED_VALUE_TYPE in a tree node. */
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extern tree build_fixed (tree, FIXED_VALUE_TYPE);
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/* Extend or truncate to a new mode. */
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extern bool fixed_convert (FIXED_VALUE_TYPE *, scalar_mode,
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const FIXED_VALUE_TYPE *, bool);
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/* Convert to a fixed-point mode from an integer. */
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extern bool fixed_convert_from_int (FIXED_VALUE_TYPE *, scalar_mode,
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double_int, bool, bool);
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/* Convert to a fixed-point mode from a real. */
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extern bool fixed_convert_from_real (FIXED_VALUE_TYPE *, scalar_mode,
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const REAL_VALUE_TYPE *, bool);
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/* Convert to a real mode from a fixed-point. */
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extern void real_convert_from_fixed (REAL_VALUE_TYPE *, scalar_mode,
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const FIXED_VALUE_TYPE *);
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/* Compare two fixed-point objects for bitwise identity. */
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extern bool fixed_identical (const FIXED_VALUE_TYPE *, const FIXED_VALUE_TYPE *);
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/* Calculate a hash value. */
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extern unsigned int fixed_hash (const FIXED_VALUE_TYPE *);
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#define FIXED_VALUES_IDENTICAL(x, y) fixed_identical (&(x), &(y))
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/* Determine whether a fixed-point value X is negative. */
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#define FIXED_VALUE_NEGATIVE(x) fixed_isneg (&(x))
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/* Render F as a decimal floating point constant. */
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extern void fixed_to_decimal (char *str, const FIXED_VALUE_TYPE *, size_t);
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/* Binary or unary arithmetic on tree_code. */
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extern bool fixed_arithmetic (FIXED_VALUE_TYPE *, int, const FIXED_VALUE_TYPE *,
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const FIXED_VALUE_TYPE *, bool);
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/* Compare fixed-point values by tree_code. */
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extern bool fixed_compare (int, const FIXED_VALUE_TYPE *,
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const FIXED_VALUE_TYPE *);
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/* Determine whether a fixed-point value X is negative. */
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extern bool fixed_isneg (const FIXED_VALUE_TYPE *);
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#endif /* GCC_FIXED_VALUE_H */
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