xref: /dflybsd-src/contrib/gcc-4.7/gcc/fixed-value.h (revision 04febcfb30580676d3e95f58a16c5137ee478b32)
1*e4b17023SJohn Marino /* Fixed-point arithmetic support.
2*e4b17023SJohn Marino    Copyright (C) 2006, 2007, 2009 Free Software Foundation, Inc.
3*e4b17023SJohn Marino 
4*e4b17023SJohn Marino This file is part of GCC.
5*e4b17023SJohn Marino 
6*e4b17023SJohn Marino GCC is free software; you can redistribute it and/or modify it under
7*e4b17023SJohn Marino the terms of the GNU General Public License as published by the Free
8*e4b17023SJohn Marino Software Foundation; either version 3, or (at your option) any later
9*e4b17023SJohn Marino version.
10*e4b17023SJohn Marino 
11*e4b17023SJohn Marino GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12*e4b17023SJohn Marino WARRANTY; without even the implied warranty of MERCHANTABILITY or
13*e4b17023SJohn Marino FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14*e4b17023SJohn Marino for more details.
15*e4b17023SJohn Marino 
16*e4b17023SJohn Marino You should have received a copy of the GNU General Public License
17*e4b17023SJohn Marino along with GCC; see the file COPYING3.  If not see
18*e4b17023SJohn Marino <http://www.gnu.org/licenses/>.  */
19*e4b17023SJohn Marino 
20*e4b17023SJohn Marino #ifndef GCC_FIXED_VALUE_H
21*e4b17023SJohn Marino #define GCC_FIXED_VALUE_H
22*e4b17023SJohn Marino 
23*e4b17023SJohn Marino #include "machmode.h"
24*e4b17023SJohn Marino #include "real.h"
25*e4b17023SJohn Marino #include "double-int.h"
26*e4b17023SJohn Marino 
27*e4b17023SJohn Marino struct GTY(()) fixed_value
28*e4b17023SJohn Marino {
29*e4b17023SJohn Marino   double_int data;		/* Store data up to 2 wide integers.  */
30*e4b17023SJohn Marino   enum machine_mode mode;	/* Use machine mode to know IBIT and FBIT.  */
31*e4b17023SJohn Marino };
32*e4b17023SJohn Marino 
33*e4b17023SJohn Marino #define FIXED_VALUE_TYPE struct fixed_value
34*e4b17023SJohn Marino 
35*e4b17023SJohn Marino #define MAX_FCONST0	18	/* For storing 18 fixed-point zeros per
36*e4b17023SJohn Marino 				   fract, ufract, accum, and uaccum modes .  */
37*e4b17023SJohn Marino #define MAX_FCONST1	8	/* For storing 8 fixed-point ones per accum
38*e4b17023SJohn Marino 				   and uaccum modes.  */
39*e4b17023SJohn Marino /* Constant fixed-point values 0 and 1.  */
40*e4b17023SJohn Marino extern FIXED_VALUE_TYPE fconst0[MAX_FCONST0];
41*e4b17023SJohn Marino extern FIXED_VALUE_TYPE fconst1[MAX_FCONST1];
42*e4b17023SJohn Marino 
43*e4b17023SJohn Marino /* Macros to access fconst0 and fconst1 via machine modes.  */
44*e4b17023SJohn Marino #define FCONST0(mode)	fconst0[mode - QQmode]
45*e4b17023SJohn Marino #define FCONST1(mode)	fconst1[mode - HAmode]
46*e4b17023SJohn Marino 
47*e4b17023SJohn Marino /* Return a CONST_FIXED with value R and mode M.  */
48*e4b17023SJohn Marino #define CONST_FIXED_FROM_FIXED_VALUE(r, m) \
49*e4b17023SJohn Marino   const_fixed_from_fixed_value (r, m)
50*e4b17023SJohn Marino extern rtx const_fixed_from_fixed_value (FIXED_VALUE_TYPE, enum machine_mode);
51*e4b17023SJohn Marino 
52*e4b17023SJohn Marino /* Initialize from a decimal or hexadecimal string.  */
53*e4b17023SJohn Marino extern void fixed_from_string (FIXED_VALUE_TYPE *, const char *,
54*e4b17023SJohn Marino 			       enum machine_mode);
55*e4b17023SJohn Marino 
56*e4b17023SJohn Marino /* In tree.c: wrap up a FIXED_VALUE_TYPE in a tree node.  */
57*e4b17023SJohn Marino extern tree build_fixed (tree, FIXED_VALUE_TYPE);
58*e4b17023SJohn Marino 
59*e4b17023SJohn Marino /* Extend or truncate to a new mode.  */
60*e4b17023SJohn Marino extern bool fixed_convert (FIXED_VALUE_TYPE *, enum machine_mode,
61*e4b17023SJohn Marino 			   const FIXED_VALUE_TYPE *, bool);
62*e4b17023SJohn Marino 
63*e4b17023SJohn Marino /* Convert to a fixed-point mode from an integer.  */
64*e4b17023SJohn Marino extern bool fixed_convert_from_int (FIXED_VALUE_TYPE *, enum machine_mode,
65*e4b17023SJohn Marino 				    double_int, bool, bool);
66*e4b17023SJohn Marino 
67*e4b17023SJohn Marino /* Convert to a fixed-point mode from a real.  */
68*e4b17023SJohn Marino extern bool fixed_convert_from_real (FIXED_VALUE_TYPE *, enum machine_mode,
69*e4b17023SJohn Marino 				     const REAL_VALUE_TYPE *, bool);
70*e4b17023SJohn Marino 
71*e4b17023SJohn Marino /* Convert to a real mode from a fixed-point.  */
72*e4b17023SJohn Marino extern void real_convert_from_fixed (REAL_VALUE_TYPE *, enum machine_mode,
73*e4b17023SJohn Marino 				     const FIXED_VALUE_TYPE *);
74*e4b17023SJohn Marino 
75*e4b17023SJohn Marino /* Compare two fixed-point objects for bitwise identity.  */
76*e4b17023SJohn Marino extern bool fixed_identical (const FIXED_VALUE_TYPE *, const FIXED_VALUE_TYPE *);
77*e4b17023SJohn Marino 
78*e4b17023SJohn Marino /* Calculate a hash value.  */
79*e4b17023SJohn Marino extern unsigned int fixed_hash (const FIXED_VALUE_TYPE *);
80*e4b17023SJohn Marino 
81*e4b17023SJohn Marino #define FIXED_VALUES_IDENTICAL(x, y)	fixed_identical (&(x), &(y))
82*e4b17023SJohn Marino 
83*e4b17023SJohn Marino /* Determine whether a fixed-point value X is negative.  */
84*e4b17023SJohn Marino #define FIXED_VALUE_NEGATIVE(x)		fixed_isneg (&(x))
85*e4b17023SJohn Marino 
86*e4b17023SJohn Marino /* Render F as a decimal floating point constant.  */
87*e4b17023SJohn Marino extern void fixed_to_decimal (char *str, const FIXED_VALUE_TYPE *, size_t);
88*e4b17023SJohn Marino 
89*e4b17023SJohn Marino /* Binary or unary arithmetic on tree_code.  */
90*e4b17023SJohn Marino extern bool fixed_arithmetic (FIXED_VALUE_TYPE *, int, const FIXED_VALUE_TYPE *,
91*e4b17023SJohn Marino 			      const FIXED_VALUE_TYPE *, bool);
92*e4b17023SJohn Marino 
93*e4b17023SJohn Marino /* Compare fixed-point values by tree_code.  */
94*e4b17023SJohn Marino extern bool fixed_compare (int, const FIXED_VALUE_TYPE *,
95*e4b17023SJohn Marino 			   const FIXED_VALUE_TYPE *);
96*e4b17023SJohn Marino 
97*e4b17023SJohn Marino /* Determine whether a fixed-point value X is negative.  */
98*e4b17023SJohn Marino extern bool fixed_isneg (const FIXED_VALUE_TYPE *);
99*e4b17023SJohn Marino 
100*e4b17023SJohn Marino #endif /* GCC_FIXED_VALUE_H */
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