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f82783bd | 1 | /* Operations with long integers. |
2bd1333d | 2 | Copyright (C) 2006, 2007, 2008, 2010 Free Software Foundation, Inc. |
b8698a0f | 3 | |
f82783bd | 4 | This file is part of GCC. |
b8698a0f | 5 | |
f82783bd ZD |
6 | GCC is free software; you can redistribute it and/or modify it |
7 | under the terms of the GNU General Public License as published by the | |
9dcd6f09 | 8 | Free Software Foundation; either version 3, or (at your option) any |
f82783bd | 9 | later version. |
b8698a0f | 10 | |
f82783bd ZD |
11 | GCC is distributed in the hope that it will be useful, but WITHOUT |
12 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
b8698a0f | 15 | |
f82783bd | 16 | You should have received a copy of the GNU General Public License |
9dcd6f09 NC |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
f82783bd ZD |
19 | |
20 | #ifndef DOUBLE_INT_H | |
21 | #define DOUBLE_INT_H | |
22 | ||
34917a10 | 23 | #ifndef GENERATOR_FILE |
e4fd22c6 | 24 | #include <gmp.h> |
34917a10 | 25 | #endif |
e4fd22c6 BM |
26 | #include "coretypes.h" |
27 | ||
f82783bd ZD |
28 | /* A large integer is currently represented as a pair of HOST_WIDE_INTs. |
29 | It therefore represents a number with precision of | |
30 | 2 * HOST_BITS_PER_WIDE_INT bits (it is however possible that the | |
31 | internal representation will change, if numbers with greater precision | |
32 | are needed, so the users should not rely on it). The representation does | |
33 | not contain any information about signedness of the represented value, so | |
34 | it can be used to represent both signed and unsigned numbers. For | |
35 | operations where the results depend on signedness (division, comparisons), | |
36 | it must be specified separately. For each such operation, there are three | |
37 | versions of the function -- double_int_op, that takes an extra UNS argument | |
38 | giving the signedness of the values, and double_int_sop and double_int_uop | |
39 | that stand for its specializations for signed and unsigned values. | |
40 | ||
41 | You may also represent with numbers in smaller precision using double_int. | |
42 | You however need to use double_int_ext (that fills in the bits of the | |
43 | number over the prescribed precision with zeros or with the sign bit) before | |
44 | operations that do not perform arithmetics modulo 2^precision (comparisons, | |
45 | division), and possibly before storing the results, if you want to keep | |
46 | them in some canonical form). In general, the signedness of double_int_ext | |
47 | should match the signedness of the operation. | |
48 | ||
49 | ??? The components of double_int differ in signedness mostly for | |
50 | historical reasons (they replace an older structure used to represent | |
66a4ad37 | 51 | numbers with precision higher than HOST_WIDE_INT). It might be less |
f82783bd ZD |
52 | confusing to have them both signed or both unsigned. */ |
53 | ||
54 | typedef struct | |
55 | { | |
56 | unsigned HOST_WIDE_INT low; | |
57 | HOST_WIDE_INT high; | |
58 | } double_int; | |
59 | ||
2bd1333d AS |
60 | #define HOST_BITS_PER_DOUBLE_INT (2 * HOST_BITS_PER_WIDE_INT) |
61 | ||
f82783bd ZD |
62 | /* Constructors and conversions. */ |
63 | ||
f82783bd ZD |
64 | /* Constructs double_int from integer CST. The bits over the precision of |
65 | HOST_WIDE_INT are filled with the sign bit. */ | |
66 | ||
67 | static inline double_int | |
68 | shwi_to_double_int (HOST_WIDE_INT cst) | |
69 | { | |
70 | double_int r; | |
b8698a0f | 71 | |
f82783bd ZD |
72 | r.low = (unsigned HOST_WIDE_INT) cst; |
73 | r.high = cst < 0 ? -1 : 0; | |
74 | ||
75 | return r; | |
76 | } | |
77 | ||
78 | /* Some useful constants. */ | |
79 | ||
80 | #define double_int_minus_one (shwi_to_double_int (-1)) | |
81 | #define double_int_zero (shwi_to_double_int (0)) | |
82 | #define double_int_one (shwi_to_double_int (1)) | |
83 | #define double_int_two (shwi_to_double_int (2)) | |
84 | #define double_int_ten (shwi_to_double_int (10)) | |
85 | ||
86 | /* Constructs double_int from unsigned integer CST. The bits over the | |
87 | precision of HOST_WIDE_INT are filled with zeros. */ | |
88 | ||
89 | static inline double_int | |
90 | uhwi_to_double_int (unsigned HOST_WIDE_INT cst) | |
91 | { | |
92 | double_int r; | |
b8698a0f | 93 | |
f82783bd ZD |
94 | r.low = cst; |
95 | r.high = 0; | |
96 | ||
97 | return r; | |
98 | } | |
99 | ||
100 | /* The following operations perform arithmetics modulo 2^precision, | |
101 | so you do not need to call double_int_ext between them, even if | |
102 | you are representing numbers with precision less than | |
103 | 2 * HOST_BITS_PER_WIDE_INT bits. */ | |
104 | ||
105 | double_int double_int_mul (double_int, double_int); | |
106 | double_int double_int_add (double_int, double_int); | |
107 | double_int double_int_neg (double_int); | |
108 | ||
109 | /* You must ensure that double_int_ext is called on the operands | |
110 | of the following operations, if the precision of the numbers | |
111 | is less than 2 * HOST_BITS_PER_WIDE_INT bits. */ | |
112 | bool double_int_fits_in_hwi_p (double_int, bool); | |
113 | bool double_int_fits_in_shwi_p (double_int); | |
114 | bool double_int_fits_in_uhwi_p (double_int); | |
115 | HOST_WIDE_INT double_int_to_shwi (double_int); | |
116 | unsigned HOST_WIDE_INT double_int_to_uhwi (double_int); | |
117 | double_int double_int_div (double_int, double_int, bool, unsigned); | |
118 | double_int double_int_sdiv (double_int, double_int, unsigned); | |
119 | double_int double_int_udiv (double_int, double_int, unsigned); | |
f414f2f3 ZD |
120 | double_int double_int_mod (double_int, double_int, bool, unsigned); |
121 | double_int double_int_smod (double_int, double_int, unsigned); | |
122 | double_int double_int_umod (double_int, double_int, unsigned); | |
123 | double_int double_int_divmod (double_int, double_int, bool, unsigned, double_int *); | |
124 | double_int double_int_sdivmod (double_int, double_int, unsigned, double_int *); | |
125 | double_int double_int_udivmod (double_int, double_int, unsigned, double_int *); | |
54fb1ae0 | 126 | double_int double_int_setbit (double_int, unsigned); |
2bd1333d AS |
127 | |
128 | /* Logical operations. */ | |
129 | static inline double_int | |
130 | double_int_not (double_int a) | |
131 | { | |
132 | a.low = ~a.low; | |
133 | a.high = ~ a.high; | |
134 | return a; | |
135 | } | |
136 | ||
137 | /* Shift operations. */ | |
138 | double_int double_int_lshift (double_int, HOST_WIDE_INT, unsigned int, bool); | |
139 | double_int double_int_rshift (double_int, HOST_WIDE_INT, unsigned int, bool); | |
140 | ||
141 | /* Returns true if CST is negative. Of course, CST is considered to | |
142 | be signed. */ | |
143 | ||
144 | static inline bool | |
145 | double_int_negative_p (double_int cst) | |
146 | { | |
147 | return cst.high < 0; | |
148 | } | |
149 | ||
f82783bd ZD |
150 | int double_int_cmp (double_int, double_int, bool); |
151 | int double_int_scmp (double_int, double_int); | |
152 | int double_int_ucmp (double_int, double_int); | |
153 | void dump_double_int (FILE *, double_int, bool); | |
154 | ||
155 | /* Zero and sign extension of numbers in smaller precisions. */ | |
156 | ||
157 | double_int double_int_ext (double_int, unsigned, bool); | |
158 | double_int double_int_sext (double_int, unsigned); | |
159 | double_int double_int_zext (double_int, unsigned); | |
b3ce5b6e | 160 | double_int double_int_mask (unsigned); |
f82783bd ZD |
161 | |
162 | #define ALL_ONES (~((unsigned HOST_WIDE_INT) 0)) | |
163 | ||
164 | /* The operands of the following comparison functions must be processed | |
165 | with double_int_ext, if their precision is less than | |
166 | 2 * HOST_BITS_PER_WIDE_INT bits. */ | |
167 | ||
168 | /* Returns true if CST is zero. */ | |
169 | ||
170 | static inline bool | |
171 | double_int_zero_p (double_int cst) | |
172 | { | |
173 | return cst.low == 0 && cst.high == 0; | |
174 | } | |
175 | ||
176 | /* Returns true if CST is one. */ | |
177 | ||
178 | static inline bool | |
179 | double_int_one_p (double_int cst) | |
180 | { | |
181 | return cst.low == 1 && cst.high == 0; | |
182 | } | |
183 | ||
184 | /* Returns true if CST is minus one. */ | |
185 | ||
186 | static inline bool | |
187 | double_int_minus_one_p (double_int cst) | |
188 | { | |
189 | return (cst.low == ALL_ONES && cst.high == -1); | |
190 | } | |
191 | ||
192 | /* Returns true if CST1 == CST2. */ | |
193 | ||
194 | static inline bool | |
195 | double_int_equal_p (double_int cst1, double_int cst2) | |
196 | { | |
197 | return cst1.low == cst2.low && cst1.high == cst2.high; | |
198 | } | |
199 | ||
330db1e3 RG |
200 | |
201 | /* Legacy interface with decomposed high/low parts. */ | |
202 | ||
203 | extern tree force_fit_type_double (tree, unsigned HOST_WIDE_INT, HOST_WIDE_INT, | |
204 | int, bool); | |
205 | extern int fit_double_type (unsigned HOST_WIDE_INT, HOST_WIDE_INT, | |
206 | unsigned HOST_WIDE_INT *, HOST_WIDE_INT *, | |
207 | const_tree); | |
208 | extern int add_double_with_sign (unsigned HOST_WIDE_INT, HOST_WIDE_INT, | |
209 | unsigned HOST_WIDE_INT, HOST_WIDE_INT, | |
210 | unsigned HOST_WIDE_INT *, HOST_WIDE_INT *, | |
211 | bool); | |
212 | #define add_double(l1,h1,l2,h2,lv,hv) \ | |
213 | add_double_with_sign (l1, h1, l2, h2, lv, hv, false) | |
214 | extern int neg_double (unsigned HOST_WIDE_INT, HOST_WIDE_INT, | |
215 | unsigned HOST_WIDE_INT *, HOST_WIDE_INT *); | |
216 | extern int mul_double_with_sign (unsigned HOST_WIDE_INT, HOST_WIDE_INT, | |
217 | unsigned HOST_WIDE_INT, HOST_WIDE_INT, | |
218 | unsigned HOST_WIDE_INT *, HOST_WIDE_INT *, | |
219 | bool); | |
220 | #define mul_double(l1,h1,l2,h2,lv,hv) \ | |
221 | mul_double_with_sign (l1, h1, l2, h2, lv, hv, false) | |
222 | extern void lshift_double (unsigned HOST_WIDE_INT, HOST_WIDE_INT, | |
223 | HOST_WIDE_INT, unsigned int, | |
224 | unsigned HOST_WIDE_INT *, HOST_WIDE_INT *, bool); | |
225 | extern void rshift_double (unsigned HOST_WIDE_INT, HOST_WIDE_INT, | |
226 | HOST_WIDE_INT, unsigned int, | |
227 | unsigned HOST_WIDE_INT *, HOST_WIDE_INT *, bool); | |
228 | extern void lrotate_double (unsigned HOST_WIDE_INT, HOST_WIDE_INT, | |
229 | HOST_WIDE_INT, unsigned int, | |
230 | unsigned HOST_WIDE_INT *, HOST_WIDE_INT *); | |
231 | extern void rrotate_double (unsigned HOST_WIDE_INT, HOST_WIDE_INT, | |
232 | HOST_WIDE_INT, unsigned int, | |
233 | unsigned HOST_WIDE_INT *, HOST_WIDE_INT *); | |
234 | extern int div_and_round_double (unsigned, int, unsigned HOST_WIDE_INT, | |
235 | HOST_WIDE_INT, unsigned HOST_WIDE_INT, | |
236 | HOST_WIDE_INT, unsigned HOST_WIDE_INT *, | |
237 | HOST_WIDE_INT *, unsigned HOST_WIDE_INT *, | |
238 | HOST_WIDE_INT *); | |
239 | ||
240 | ||
34917a10 | 241 | #ifndef GENERATOR_FILE |
e4fd22c6 BM |
242 | /* Conversion to and from GMP integer representations. */ |
243 | ||
244 | void mpz_set_double_int (mpz_t, double_int, bool); | |
22ea9ec0 | 245 | double_int mpz_get_double_int (const_tree, mpz_t, bool); |
34917a10 | 246 | #endif |
e4fd22c6 | 247 | |
f82783bd | 248 | #endif /* DOUBLE_INT_H */ |