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gcc.gnu.org Git - gcc.git/blob - gcc/real.h
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{ HOST_WIDE_INT i[sizeof (double)/sizeof (HOST_WIDE_INT)]; }
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 #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
72 /* Convert a type `double' value in host format first to a type `float'
73 value in host format and then to a single type `long' value which
74 is the bitwise equivalent of the `float' value. */
75 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
76 do { float f = (float) (IN); \
77 (OUT) = *(long *) &f; \
80 /* Convert a type `double' value in host format to a pair of type `long'
81 values which is its bitwise equivalent, but put the two words into
82 proper word order for the target. */
83 #if defined (HOST_WORDS_BIG_ENDIAN) == WORDS_BIG_ENDIAN
84 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
85 do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\
86 (OUT)[0] = ((long *) &in)[0]; \
87 (OUT)[1] = ((long *) &in)[1]; \
90 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
91 do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\
92 (OUT)[1] = ((long *) &in)[0]; \
93 (OUT)[0] = ((long *) &in)[1]; \
96 #endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
98 /* Compare two floating-point values for equality. */
99 #ifndef REAL_VALUES_EQUAL
100 #define REAL_VALUES_EQUAL(x,y) ((x) == (y))
103 /* Compare two floating-point values for less than. */
104 #ifndef REAL_VALUES_LESS
105 #define REAL_VALUES_LESS(x,y) ((x) < (y))
108 /* Convert a floating-point value to integer by truncating. */
109 #ifndef REAL_VALUE_FIX_TRUNCATE
110 #define REAL_VALUE_FIX_TRUNCATE(x) ((int) (x))
113 /* Convert a floating-point value to unsigned integer by truncating. */
114 #ifndef REAL_VALUE_UNSIGNED_FIX_TRUNCATE
115 #define REAL_VALUE_UNSIGNED_FIX_TRUNCATE(x) ((unsigned int) (x))
118 /* Convert a floating-point value to integer, using any rounding mode. */
119 #ifndef REAL_VALUE_FIX
120 #define REAL_VALUE_FIX(x) ((int) (x))
123 /* Convert a floating-point value to unsigned integer, using any rounding
125 #ifndef REAL_VALUE_UNSIGNED_FIX
126 #define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
129 /* Scale X by Y powers of 2. */
130 #ifndef REAL_VALUE_LDEXP
131 #define REAL_VALUE_LDEXP(x,y) ldexp (x, y)
132 extern double ldexp ();
135 /* Convert the string X to a floating-point value. */
136 #ifndef REAL_VALUE_ATOF
137 #define REAL_VALUE_ATOF(x) atof (x)
138 #if defined (MIPSEL) || defined (MIPSEB)
139 /* MIPS compiler can't handle parens around the function name.
140 This problem *does not* appear to be connected with any
141 macro definition for atof. It does not seem there is one. */
142 extern double atof ();
144 extern double (atof
) ();
148 /* Negate the floating-point value X. */
149 #ifndef REAL_VALUE_NEGATE
150 #define REAL_VALUE_NEGATE(x) (- (x))
153 /* Truncate the floating-point value X to mode MODE. This is correct only
154 for the most common case where the host and target have objects of the same
155 size and where `float' is SFmode. */
157 /* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate. */
158 extern REAL_VALUE_TYPE
real_value_truncate ();
160 #ifndef REAL_VALUE_TRUNCATE
161 #define REAL_VALUE_TRUNCATE(mode, x) \
162 (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \
166 /* Determine whether a floating-point value X is infinite. */
167 #ifndef REAL_VALUE_ISINF
168 #define REAL_VALUE_ISINF(x) (target_isinf (x))
171 /* Determine whether a floating-point value X is a NaN. */
172 #ifndef REAL_VALUE_ISNAN
173 #define REAL_VALUE_ISNAN(x) (target_isnan (x))
176 /* Determine whether a floating-point value X is negative. */
177 #ifndef REAL_VALUE_NEGATIVE
178 #define REAL_VALUE_NEGATIVE(x) (target_negative (x))
181 /* Determine whether a floating-point value X is minus 0. */
182 #ifndef REAL_VALUE_MINUS_ZERO
183 #define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
186 /* Constant real values 0, 1, 2, and -1. */
188 extern REAL_VALUE_TYPE dconst0
;
189 extern REAL_VALUE_TYPE dconst1
;
190 extern REAL_VALUE_TYPE dconst2
;
191 extern REAL_VALUE_TYPE dconstm1
;
193 /* Union type used for extracting real values from CONST_DOUBLEs
194 or putting them in. */
199 HOST_WIDE_INT i
[sizeof (REAL_VALUE_TYPE
) / sizeof (HOST_WIDE_INT
)];
202 /* For a CONST_DOUBLE:
203 The usual two ints that hold the value.
204 For a DImode, that is all there are;
205 and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
206 For a float, the number of ints varies,
207 and CONST_DOUBLE_LOW is the one that should come first *in memory*.
208 So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */
209 #define CONST_DOUBLE_LOW(r) XWINT (r, 2)
210 #define CONST_DOUBLE_HIGH(r) XWINT (r, 3)
212 /* Link for chain of all CONST_DOUBLEs in use in current function. */
213 #define CONST_DOUBLE_CHAIN(r) XEXP (r, 1)
214 /* The MEM which represents this CONST_DOUBLE's value in memory,
215 or const0_rtx if no MEM has been made for it yet,
216 or cc0_rtx if it is not on the chain. */
217 #define CONST_DOUBLE_MEM(r) XEXP (r, 0)
219 /* Function to return a real value (not a tree node)
220 from a given integer constant. */
221 REAL_VALUE_TYPE
real_value_from_int_cst ();
223 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
225 #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
226 do { union real_extract u; \
227 bcopy (&CONST_DOUBLE_LOW ((from)), &u, sizeof u); \
228 to = u.d; } while (0)
230 /* Return a CONST_DOUBLE with value R and mode M. */
232 #define CONST_DOUBLE_FROM_REAL_VALUE(r,m) immed_real_const_1 (r, m)
234 #endif /* Not REAL_H_INCLUDED */
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