Mercurial > hg > CbC > CbC_gcc
annotate gcc/double-int.h @ 63:b7f97abdc517 gcc-4.6-20100522
update gcc from gcc-4.5.0 to gcc-4.6
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 24 May 2010 12:47:05 +0900 |
| parents | 77e2b8dfacca |
| children | f6334be47118 |
| rev | line source |
|---|---|
| 0 | 1 /* Operations with long integers. |
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2 Copyright (C) 2006, 2007, 2008, 2010 Free Software Foundation, Inc. |
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3 |
| 0 | 4 This file is part of GCC. |
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5 |
| 0 | 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 | |
| 8 Free Software Foundation; either version 3, or (at your option) any | |
| 9 later version. | |
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10 |
| 0 | 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. | |
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15 |
| 0 | 16 You should have received a copy of the GNU General Public License |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 #ifndef DOUBLE_INT_H | |
| 21 #define DOUBLE_INT_H | |
| 22 | |
| 23 #ifndef GENERATOR_FILE | |
| 24 #include <gmp.h> | |
| 25 #endif | |
| 26 #include "coretypes.h" | |
| 27 | |
| 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 | |
| 51 numbers with precision higher than HOST_WIDE_INT). It might be less | |
| 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 | |
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60 #define HOST_BITS_PER_DOUBLE_INT (2 * HOST_BITS_PER_WIDE_INT) |
| 0 | 61 |
| 62 /* Constructors and conversions. */ | |
| 63 | |
| 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; | |
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71 |
| 0 | 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; | |
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93 |
| 0 | 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); | |
| 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 *); | |
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126 double_int double_int_setbit (double_int, unsigned); |
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127 |
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128 /* Logical operations. */ |
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129 |
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130 /* Returns ~A. */ |
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131 |
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132 static inline double_int |
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133 double_int_not (double_int a) |
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134 { |
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135 a.low = ~a.low; |
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136 a.high = ~ a.high; |
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137 return a; |
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138 } |
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139 |
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140 /* Returns A | B. */ |
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141 |
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142 static inline double_int |
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143 double_int_ior (double_int a, double_int b) |
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144 { |
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145 a.low |= b.low; |
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146 a.high |= b.high; |
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147 return a; |
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148 } |
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149 |
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150 /* Shift operations. */ |
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151 double_int double_int_lshift (double_int, HOST_WIDE_INT, unsigned int, bool); |
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152 double_int double_int_rshift (double_int, HOST_WIDE_INT, unsigned int, bool); |
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153 |
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154 /* Returns true if CST is negative. Of course, CST is considered to |
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155 be signed. */ |
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156 |
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157 static inline bool |
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158 double_int_negative_p (double_int cst) |
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159 { |
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160 return cst.high < 0; |
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161 } |
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162 |
| 0 | 163 int double_int_cmp (double_int, double_int, bool); |
| 164 int double_int_scmp (double_int, double_int); | |
| 165 int double_int_ucmp (double_int, double_int); | |
| 166 void dump_double_int (FILE *, double_int, bool); | |
| 167 | |
| 168 /* Zero and sign extension of numbers in smaller precisions. */ | |
| 169 | |
| 170 double_int double_int_ext (double_int, unsigned, bool); | |
| 171 double_int double_int_sext (double_int, unsigned); | |
| 172 double_int double_int_zext (double_int, unsigned); | |
| 173 double_int double_int_mask (unsigned); | |
| 174 | |
| 175 #define ALL_ONES (~((unsigned HOST_WIDE_INT) 0)) | |
| 176 | |
| 177 /* The operands of the following comparison functions must be processed | |
| 178 with double_int_ext, if their precision is less than | |
| 179 2 * HOST_BITS_PER_WIDE_INT bits. */ | |
| 180 | |
| 181 /* Returns true if CST is zero. */ | |
| 182 | |
| 183 static inline bool | |
| 184 double_int_zero_p (double_int cst) | |
| 185 { | |
| 186 return cst.low == 0 && cst.high == 0; | |
| 187 } | |
| 188 | |
| 189 /* Returns true if CST is one. */ | |
| 190 | |
| 191 static inline bool | |
| 192 double_int_one_p (double_int cst) | |
| 193 { | |
| 194 return cst.low == 1 && cst.high == 0; | |
| 195 } | |
| 196 | |
| 197 /* Returns true if CST is minus one. */ | |
| 198 | |
| 199 static inline bool | |
| 200 double_int_minus_one_p (double_int cst) | |
| 201 { | |
| 202 return (cst.low == ALL_ONES && cst.high == -1); | |
| 203 } | |
| 204 | |
| 205 /* Returns true if CST1 == CST2. */ | |
| 206 | |
| 207 static inline bool | |
| 208 double_int_equal_p (double_int cst1, double_int cst2) | |
| 209 { | |
| 210 return cst1.low == cst2.low && cst1.high == cst2.high; | |
| 211 } | |
| 212 | |
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213 |
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214 /* Legacy interface with decomposed high/low parts. */ |
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215 |
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216 extern tree force_fit_type_double (tree, unsigned HOST_WIDE_INT, HOST_WIDE_INT, |
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217 int, bool); |
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218 extern int fit_double_type (unsigned HOST_WIDE_INT, HOST_WIDE_INT, |
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219 unsigned HOST_WIDE_INT *, HOST_WIDE_INT *, |
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220 const_tree); |
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221 extern int add_double_with_sign (unsigned HOST_WIDE_INT, HOST_WIDE_INT, |
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222 unsigned HOST_WIDE_INT, HOST_WIDE_INT, |
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223 unsigned HOST_WIDE_INT *, HOST_WIDE_INT *, |
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224 bool); |
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225 #define add_double(l1,h1,l2,h2,lv,hv) \ |
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226 add_double_with_sign (l1, h1, l2, h2, lv, hv, false) |
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227 extern int neg_double (unsigned HOST_WIDE_INT, HOST_WIDE_INT, |
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228 unsigned HOST_WIDE_INT *, HOST_WIDE_INT *); |
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229 extern int mul_double_with_sign (unsigned HOST_WIDE_INT, HOST_WIDE_INT, |
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230 unsigned HOST_WIDE_INT, HOST_WIDE_INT, |
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231 unsigned HOST_WIDE_INT *, HOST_WIDE_INT *, |
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232 bool); |
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233 #define mul_double(l1,h1,l2,h2,lv,hv) \ |
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234 mul_double_with_sign (l1, h1, l2, h2, lv, hv, false) |
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235 extern void lshift_double (unsigned HOST_WIDE_INT, HOST_WIDE_INT, |
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236 HOST_WIDE_INT, unsigned int, |
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237 unsigned HOST_WIDE_INT *, HOST_WIDE_INT *, bool); |
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238 extern void rshift_double (unsigned HOST_WIDE_INT, HOST_WIDE_INT, |
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239 HOST_WIDE_INT, unsigned int, |
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240 unsigned HOST_WIDE_INT *, HOST_WIDE_INT *, bool); |
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241 extern void lrotate_double (unsigned HOST_WIDE_INT, HOST_WIDE_INT, |
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242 HOST_WIDE_INT, unsigned int, |
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243 unsigned HOST_WIDE_INT *, HOST_WIDE_INT *); |
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244 extern void rrotate_double (unsigned HOST_WIDE_INT, HOST_WIDE_INT, |
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245 HOST_WIDE_INT, unsigned int, |
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246 unsigned HOST_WIDE_INT *, HOST_WIDE_INT *); |
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247 extern int div_and_round_double (unsigned, int, unsigned HOST_WIDE_INT, |
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248 HOST_WIDE_INT, unsigned HOST_WIDE_INT, |
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249 HOST_WIDE_INT, unsigned HOST_WIDE_INT *, |
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250 HOST_WIDE_INT *, unsigned HOST_WIDE_INT *, |
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251 HOST_WIDE_INT *); |
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252 |
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253 |
| 0 | 254 #ifndef GENERATOR_FILE |
| 255 /* Conversion to and from GMP integer representations. */ | |
| 256 | |
| 257 void mpz_set_double_int (mpz_t, double_int, bool); | |
| 258 double_int mpz_get_double_int (const_tree, mpz_t, bool); | |
| 259 #endif | |
| 260 | |
| 261 #endif /* DOUBLE_INT_H */ |