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/* Fixed-point arithmetic support.
Copyright (C) 2006-2014 Free Software Foundation, Inc.
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_FIXED_VALUE_H
#define GCC_FIXED_VALUE_H
#include "machmode.h"
#include "real.h"
#include "double-int.h"
struct GTY(()) fixed_value
{
double_int data; /* Store data up to 2 wide integers. */
enum machine_mode mode; /* Use machine mode to know IBIT and FBIT. */
};
#define FIXED_VALUE_TYPE struct fixed_value
#define MAX_FCONST0 18 /* For storing 18 fixed-point zeros per
fract, ufract, accum, and uaccum modes . */
#define MAX_FCONST1 8 /* For storing 8 fixed-point ones per accum
and uaccum modes. */
/* Constant fixed-point values 0 and 1. */
extern FIXED_VALUE_TYPE fconst0[MAX_FCONST0];
extern FIXED_VALUE_TYPE fconst1[MAX_FCONST1];
/* Macros to access fconst0 and fconst1 via machine modes. */
#define FCONST0(mode) fconst0[mode - QQmode]
#define FCONST1(mode) fconst1[mode - HAmode]
/* Return a CONST_FIXED with value R and mode M. */
#define CONST_FIXED_FROM_FIXED_VALUE(r, m) \
const_fixed_from_fixed_value (r, m)
extern rtx const_fixed_from_fixed_value (FIXED_VALUE_TYPE, enum machine_mode);
/* Construct a FIXED_VALUE from a bit payload and machine mode MODE.
The bits in PAYLOAD are sign-extended/zero-extended according to MODE. */
extern FIXED_VALUE_TYPE fixed_from_double_int (double_int,
enum machine_mode);
/* Return a CONST_FIXED from a bit payload and machine mode MODE.
The bits in PAYLOAD are sign-extended/zero-extended according to MODE. */
static inline rtx
const_fixed_from_double_int (double_int payload,
enum machine_mode mode)
{
return
const_fixed_from_fixed_value (fixed_from_double_int (payload, mode),
mode);
}
/* Initialize from a decimal or hexadecimal string. */
extern void fixed_from_string (FIXED_VALUE_TYPE *, const char *,
enum machine_mode);
/* In tree.c: wrap up a FIXED_VALUE_TYPE in a tree node. */
extern tree build_fixed (tree, FIXED_VALUE_TYPE);
/* Extend or truncate to a new mode. */
extern bool fixed_convert (FIXED_VALUE_TYPE *, enum machine_mode,
const FIXED_VALUE_TYPE *, bool);
/* Convert to a fixed-point mode from an integer. */
extern bool fixed_convert_from_int (FIXED_VALUE_TYPE *, enum machine_mode,
double_int, bool, bool);
/* Convert to a fixed-point mode from a real. */
extern bool fixed_convert_from_real (FIXED_VALUE_TYPE *, enum machine_mode,
const REAL_VALUE_TYPE *, bool);
/* Convert to a real mode from a fixed-point. */
extern void real_convert_from_fixed (REAL_VALUE_TYPE *, enum machine_mode,
const FIXED_VALUE_TYPE *);
/* Compare two fixed-point objects for bitwise identity. */
extern bool fixed_identical (const FIXED_VALUE_TYPE *, const FIXED_VALUE_TYPE *);
/* Calculate a hash value. */
extern unsigned int fixed_hash (const FIXED_VALUE_TYPE *);
#define FIXED_VALUES_IDENTICAL(x, y) fixed_identical (&(x), &(y))
/* Determine whether a fixed-point value X is negative. */
#define FIXED_VALUE_NEGATIVE(x) fixed_isneg (&(x))
/* Render F as a decimal floating point constant. */
extern void fixed_to_decimal (char *str, const FIXED_VALUE_TYPE *, size_t);
/* Binary or unary arithmetic on tree_code. */
extern bool fixed_arithmetic (FIXED_VALUE_TYPE *, int, const FIXED_VALUE_TYPE *,
const FIXED_VALUE_TYPE *, bool);
/* Compare fixed-point values by tree_code. */
extern bool fixed_compare (int, const FIXED_VALUE_TYPE *,
const FIXED_VALUE_TYPE *);
/* Determine whether a fixed-point value X is negative. */
extern bool fixed_isneg (const FIXED_VALUE_TYPE *);
#endif /* GCC_FIXED_VALUE_H */
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