1 /* Front-end tree definitions for GNU compiler.
2 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
20 #ifndef REAL_H_INCLUDED
21 #define REAL_H_INCLUDED
23 /* Define codes for all the float formats that we know of. */
24 #define UNKNOWN_FLOAT_FORMAT 0
25 #define IEEE_FLOAT_FORMAT 1
26 #define VAX_FLOAT_FORMAT 2
28 /* Default to IEEE float if not specified. Nearly all machines use it. */
30 #ifndef TARGET_FLOAT_FORMAT
31 #define TARGET_FLOAT_FORMAT IEEE_FLOAT_FORMAT
34 #ifndef HOST_FLOAT_FORMAT
35 #define HOST_FLOAT_FORMAT IEEE_FLOAT_FORMAT
38 #if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
42 #ifdef REAL_ARITHMETIC
43 /* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
44 when REAL_ARITHMETIC etc. are not defined. */
46 /* Now see if the host and target machines use the same format.
47 If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
48 reals as doubles because we have no better way in this cross compiler.)
49 This turns off various optimizations that can happen when we know the
50 compiler's float format matches the target's float format.
52 #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
53 #define REAL_IS_NOT_DOUBLE
54 #ifndef REAL_VALUE_TYPE
55 #define REAL_VALUE_TYPE \
56 struct real_value { long i[sizeof (double) / sizeof (long)]; }
57 #endif /* no REAL_VALUE_TYPE */
58 #endif /* formats differ */
61 /* If we are not cross-compiling, use a `double' to represent the
62 floating-point value. Otherwise, use some other type
63 (probably a struct containing an array of longs). */
64 #ifndef REAL_VALUE_TYPE
65 #define REAL_VALUE_TYPE double
67 #define REAL_IS_NOT_DOUBLE
70 /* Compare two floating-point values for equality. */
71 #ifndef REAL_VALUES_EQUAL
72 #define REAL_VALUES_EQUAL(x,y) ((x) == (y))
75 /* Compare two floating-point values for less than. */
76 #ifndef REAL_VALUES_LESS
77 #define REAL_VALUES_LESS(x,y) ((x) < (y))
80 /* Convert a floating-point value to integer by truncating. */
81 #ifndef REAL_VALUE_FIX_TRUNCATE
82 #define REAL_VALUE_FIX_TRUNCATE(x) ((int) (x))
85 /* Convert a floating-point value to unsigned integer by truncating. */
86 #ifndef REAL_VALUE_UNSIGNED_FIX_TRUNCATE
87 #define REAL_VALUE_UNSIGNED_FIX_TRUNCATE(x) ((unsigned int) (x))
90 /* Convert a floating-point value to integer, using any rounding mode. */
91 #ifndef REAL_VALUE_FIX
92 #define REAL_VALUE_FIX(x) ((int) (x))
95 /* Convert a floating-point value to unsigned integer, using any rounding
97 #ifndef REAL_VALUE_UNSIGNED_FIX
98 #define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
101 /* Scale X by Y powers of 2. */
102 #ifndef REAL_VALUE_LDEXP
103 #define REAL_VALUE_LDEXP(x,y) ldexp (x, y)
104 extern double ldexp ();
107 /* Convert the string X to a floating-point value. */
108 #ifndef REAL_VALUE_ATOF
109 #define REAL_VALUE_ATOF(x) atof (x)
110 #if defined (MIPSEL) || defined (MIPSEB)
111 /* MIPS compiler can't handle parens around the function name.
112 This problem *does not* appear to be connected with any
113 macro definition for atof. It does not seem there is one. */
114 extern double atof ();
116 extern double (atof
) ();
120 /* Negate the floating-point value X. */
121 #ifndef REAL_VALUE_NEGATE
122 #define REAL_VALUE_NEGATE(x) (- (x))
125 /* Truncate the floating-point value X to mode MODE. This is correct only
126 for the most common case where the host and target have objects of the same
127 size and where `float' is SFmode. */
129 #ifndef REAL_VALUE_TRUNCATE
130 #define REAL_VALUE_TRUNCATE(mode, x) \
131 (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \
135 /* Determine whether a floating-point value X is infinite. */
136 #ifndef REAL_VALUE_ISINF
137 #define REAL_VALUE_ISINF(x) (target_isinf (x))
140 /* Determine whether a floating-point value X is a NaN. */
141 #ifndef REAL_VALUE_ISNAN
142 #define REAL_VALUE_ISNAN(x) (target_isnan (x))
145 /* Determine whether a floating-point value X is negative. */
146 #ifndef REAL_VALUE_NEGATIVE
147 #define REAL_VALUE_NEGATIVE(x) (target_negative (x))
150 /* Determine whether a floating-point value X is minus 0. */
151 #ifndef REAL_VALUE_MINUS_ZERO
152 #define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
155 /* Constant real values 0, 1, 2, and -1. */
157 extern REAL_VALUE_TYPE dconst0
;
158 extern REAL_VALUE_TYPE dconst1
;
159 extern REAL_VALUE_TYPE dconst2
;
160 extern REAL_VALUE_TYPE dconstm1
;
162 /* Union type used for extracting real values from CONST_DOUBLEs
163 or putting them in. */
168 int i
[sizeof (REAL_VALUE_TYPE
) / sizeof (int)];
171 /* For a CONST_DOUBLE:
172 The usual two ints that hold the value.
173 For a DImode, that is all there are;
174 and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
175 For a float, the number of ints varies,
176 and CONST_DOUBLE_LOW is the one that should come first *in memory*.
177 So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */
178 #define CONST_DOUBLE_LOW(r) XINT (r, 2)
179 #define CONST_DOUBLE_HIGH(r) XINT (r, 3)
181 /* Link for chain of all CONST_DOUBLEs in use in current function. */
182 #define CONST_DOUBLE_CHAIN(r) XEXP (r, 1)
183 /* The MEM which represents this CONST_DOUBLE's value in memory,
184 or const0_rtx if no MEM has been made for it yet,
185 or cc0_rtx if it is not on the chain. */
186 #define CONST_DOUBLE_MEM(r) XEXP (r, 0)
188 /* Function to return a real value (not a tree node)
189 from a given integer constant. */
190 REAL_VALUE_TYPE
real_value_from_int_cst ();
192 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
194 #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
195 do { union real_extract u; \
196 bcopy (&CONST_DOUBLE_LOW ((from)), &u, sizeof u); \
197 to = u.d; } while (0)
199 /* Return a CONST_DOUBLE with value R and mode M. */
201 #define CONST_DOUBLE_FROM_REAL_VALUE(r,m) immed_real_const_1 (r, m)
203 #endif /* Not REAL_H_INCLUDED */