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878ddf1f | 1 | /** @file\r |
2 | Leaf math worker functions that require 64-bit arithmetic support from the\r | |
3 | compiler.\r | |
4 | \r | |
5 | Copyright (c) 2006, Intel Corporation<BR>\r | |
6 | All rights reserved. This program and the accompanying materials\r | |
7 | are licensed and made available under the terms and conditions of the BSD License\r | |
8 | which accompanies this distribution. The full text of the license may be found at\r | |
9 | http://opensource.org/licenses/bsd-license.php\r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | \r | |
14 | Module Name: Math64.c\r | |
15 | \r | |
16 | **/\r | |
17 | \r | |
bda7fbcc | 18 | #include "BaseLibInternals.h"\r |
19 | \r | |
1ea5ca46 | 20 | /**\r |
bda7fbcc | 21 | Shifts a 64-bit integer left between 0 and 63 bits. The low bits\r |
1ea5ca46 | 22 | are filled with zeros. The shifted value is returned.\r |
23 | \r | |
24 | This function shifts the 64-bit value Operand to the left by Count bits. The\r | |
25 | low Count bits are set to zero. The shifted value is returned.\r | |
26 | \r | |
27 | @param Operand The 64-bit operand to shift left.\r | |
28 | @param Count The number of bits to shift left.\r | |
29 | \r | |
30 | @return Operand << Count\r | |
31 | \r | |
32 | **/\r | |
878ddf1f | 33 | UINT64\r |
bda7fbcc | 34 | EFIAPI\r |
878ddf1f | 35 | InternalMathLShiftU64 (\r |
36 | IN UINT64 Operand,\r | |
37 | IN UINTN Count\r | |
38 | )\r | |
39 | {\r | |
40 | return Operand << Count;\r | |
41 | }\r | |
42 | \r | |
1ea5ca46 | 43 | /**\r |
bda7fbcc | 44 | Shifts a 64-bit integer right between 0 and 63 bits. This high bits\r |
1ea5ca46 | 45 | are filled with zeros. The shifted value is returned.\r |
46 | \r | |
47 | This function shifts the 64-bit value Operand to the right by Count bits. The\r | |
48 | high Count bits are set to zero. The shifted value is returned.\r | |
49 | \r | |
50 | @param Operand The 64-bit operand to shift right.\r | |
51 | @param Count The number of bits to shift right.\r | |
52 | \r | |
53 | @return Operand >> Count\r | |
54 | \r | |
55 | **/\r | |
878ddf1f | 56 | UINT64\r |
57 | EFIAPI\r | |
58 | InternalMathRShiftU64 (\r | |
59 | IN UINT64 Operand,\r | |
60 | IN UINTN Count\r | |
61 | )\r | |
62 | {\r | |
63 | return Operand >> Count;\r | |
64 | }\r | |
65 | \r | |
1ea5ca46 | 66 | /**\r |
bda7fbcc | 67 | Shifts a 64-bit integer right between 0 and 63 bits. The high bits\r |
1ea5ca46 | 68 | are filled with original integer's bit 63. The shifted value is returned.\r |
69 | \r | |
70 | This function shifts the 64-bit value Operand to the right by Count bits. The\r | |
71 | high Count bits are set to bit 63 of Operand. The shifted value is returned.\r | |
72 | \r | |
73 | If Count is greater than 63, then ASSERT().\r | |
74 | \r | |
75 | @param Operand The 64-bit operand to shift right.\r | |
76 | @param Count The number of bits to shift right.\r | |
77 | \r | |
78 | @return Operand arithmetically shifted right by Count\r | |
79 | \r | |
80 | **/\r | |
878ddf1f | 81 | UINT64\r |
82 | EFIAPI\r | |
83 | InternalMathARShiftU64 (\r | |
84 | IN UINT64 Operand,\r | |
85 | IN UINTN Count\r | |
86 | )\r | |
87 | {\r | |
88 | //\r | |
89 | // Test if this compiler supports arithmetic shift\r | |
90 | //\r | |
91 | if ((((-1) << (sizeof (-1) * 8 - 1)) >> (sizeof (-1) * 8 - 1)) == -1) {\r | |
92 | //\r | |
93 | // Arithmetic shift is supported\r | |
94 | //\r | |
95 | return (UINT64)((INT64)Operand >> Count);\r | |
96 | }\r | |
97 | \r | |
98 | //\r | |
99 | // Arithmetic is not supported\r | |
100 | //\r | |
101 | return (Operand >> Count) |\r | |
102 | ((INTN)Operand < 0 ? ~((UINTN)-1 >> Count) : 0);\r | |
103 | }\r | |
104 | \r | |
1ea5ca46 | 105 | \r |
106 | /**\r | |
bda7fbcc | 107 | Rotates a 64-bit integer left between 0 and 63 bits, filling\r |
1ea5ca46 | 108 | the low bits with the high bits that were rotated.\r |
109 | \r | |
110 | This function rotates the 64-bit value Operand to the left by Count bits. The\r | |
111 | low Count bits are fill with the high Count bits of Operand. The rotated\r | |
112 | value is returned.\r | |
113 | \r | |
114 | @param Operand The 64-bit operand to rotate left.\r | |
115 | @param Count The number of bits to rotate left.\r | |
116 | \r | |
117 | @return Operand <<< Count\r | |
118 | \r | |
119 | **/\r | |
878ddf1f | 120 | UINT64\r |
121 | EFIAPI\r | |
122 | InternalMathLRotU64 (\r | |
123 | IN UINT64 Operand,\r | |
124 | IN UINTN Count\r | |
125 | )\r | |
126 | {\r | |
127 | return (Operand << Count) | (Operand >> (64 - Count));\r | |
128 | }\r | |
129 | \r | |
1ea5ca46 | 130 | /**\r |
bda7fbcc | 131 | Rotates a 64-bit integer right between 0 and 63 bits, filling\r |
1ea5ca46 | 132 | the high bits with the high low bits that were rotated.\r |
133 | \r | |
134 | This function rotates the 64-bit value Operand to the right by Count bits.\r | |
135 | The high Count bits are fill with the low Count bits of Operand. The rotated\r | |
136 | value is returned.\r | |
137 | \r | |
138 | @param Operand The 64-bit operand to rotate right.\r | |
139 | @param Count The number of bits to rotate right.\r | |
140 | \r | |
141 | @return Operand >>> Count\r | |
142 | \r | |
143 | **/\r | |
878ddf1f | 144 | UINT64\r |
145 | EFIAPI\r | |
146 | InternalMathRRotU64 (\r | |
147 | IN UINT64 Operand,\r | |
148 | IN UINTN Count\r | |
149 | )\r | |
150 | {\r | |
151 | return (Operand >> Count) | (Operand << (64 - Count));\r | |
152 | }\r | |
153 | \r | |
1ea5ca46 | 154 | /**\r |
bda7fbcc | 155 | Switches the endianess of a 64-bit integer.\r |
1ea5ca46 | 156 | \r |
157 | This function swaps the bytes in a 64-bit unsigned value to switch the value\r | |
158 | from little endian to big endian or vice versa. The byte swapped value is\r | |
159 | returned.\r | |
160 | \r | |
161 | @param Operand A 64-bit unsigned value.\r | |
162 | \r | |
163 | @return The byte swaped Operand.\r | |
164 | \r | |
165 | **/\r | |
878ddf1f | 166 | UINT64\r |
167 | EFIAPI\r | |
168 | InternalMathSwapBytes64 (\r | |
169 | IN UINT64 Operand\r | |
170 | )\r | |
171 | {\r | |
172 | return (UINT64)(\r | |
173 | ((UINT64)SwapBytes32 ((UINT32)Operand) << 32) |\r | |
174 | ((UINT64)SwapBytes32 ((UINT32)(Operand >> 32)))\r | |
175 | );\r | |
176 | }\r | |
177 | \r | |
1ea5ca46 | 178 | /**\r |
bda7fbcc | 179 | Multiples a 64-bit unsigned integer by a 32-bit unsigned integer\r |
1ea5ca46 | 180 | and generates a 64-bit unsigned result.\r |
181 | \r | |
182 | This function multiples the 64-bit unsigned value Multiplicand by the 32-bit\r | |
183 | unsigned value Multiplier and generates a 64-bit unsigned result. This 64-\r | |
184 | bit unsigned result is returned.\r | |
185 | \r | |
186 | @param Multiplicand A 64-bit unsigned value.\r | |
187 | @param Multiplier A 32-bit unsigned value.\r | |
188 | \r | |
189 | @return Multiplicand * Multiplier\r | |
190 | \r | |
191 | **/\r | |
878ddf1f | 192 | UINT64\r |
193 | EFIAPI\r | |
194 | InternalMathMultU64x32 (\r | |
195 | IN UINT64 Multiplicand,\r | |
196 | IN UINT32 Multiplier\r | |
197 | )\r | |
198 | {\r | |
199 | return Multiplicand * Multiplier;\r | |
200 | }\r | |
201 | \r | |
1ea5ca46 | 202 | \r |
203 | /**\r | |
bda7fbcc | 204 | Multiples a 64-bit unsigned integer by a 64-bit unsigned integer\r |
1ea5ca46 | 205 | and generates a 64-bit unsigned result.\r |
206 | \r | |
207 | This function multiples the 64-bit unsigned value Multiplicand by the 64-bit\r | |
208 | unsigned value Multiplier and generates a 64-bit unsigned result. This 64-\r | |
209 | bit unsigned result is returned.\r | |
210 | \r | |
211 | @param Multiplicand A 64-bit unsigned value.\r | |
212 | @param Multiplier A 64-bit unsigned value.\r | |
213 | \r | |
214 | @return Multiplicand * Multiplier\r | |
215 | \r | |
216 | **/\r | |
878ddf1f | 217 | UINT64\r |
218 | EFIAPI\r | |
219 | InternalMathMultU64x64 (\r | |
220 | IN UINT64 Multiplicand,\r | |
221 | IN UINT64 Multiplier\r | |
222 | )\r | |
223 | {\r | |
224 | return Multiplicand * Multiplier;\r | |
225 | }\r | |
226 | \r | |
1ea5ca46 | 227 | /**\r |
bda7fbcc | 228 | Divides a 64-bit unsigned integer by a 32-bit unsigned integer and\r |
1ea5ca46 | 229 | generates a 64-bit unsigned result.\r |
bda7fbcc | 230 | \r |
1ea5ca46 | 231 | This function divides the 64-bit unsigned value Dividend by the 32-bit\r |
232 | unsigned value Divisor and generates a 64-bit unsigned quotient. This\r | |
233 | function returns the 64-bit unsigned quotient.\r | |
234 | \r | |
235 | @param Dividend A 64-bit unsigned value.\r | |
236 | @param Divisor A 32-bit unsigned value.\r | |
237 | \r | |
238 | @return Dividend / Divisor\r | |
239 | \r | |
240 | **/\r | |
878ddf1f | 241 | UINT64\r |
242 | EFIAPI\r | |
243 | InternalMathDivU64x32 (\r | |
244 | IN UINT64 Dividend,\r | |
245 | IN UINT32 Divisor\r | |
246 | )\r | |
247 | {\r | |
248 | return Dividend / Divisor;\r | |
249 | }\r | |
250 | \r | |
1ea5ca46 | 251 | /**\r |
bda7fbcc | 252 | Divides a 64-bit unsigned integer by a 32-bit unsigned integer\r |
1ea5ca46 | 253 | and generates a 32-bit unsigned remainder.\r |
254 | \r | |
255 | This function divides the 64-bit unsigned value Dividend by the 32-bit\r | |
256 | unsigned value Divisor and generates a 32-bit remainder. This function\r | |
257 | returns the 32-bit unsigned remainder.\r | |
258 | \r | |
259 | @param Dividend A 64-bit unsigned value.\r | |
260 | @param Divisor A 32-bit unsigned value.\r | |
261 | \r | |
262 | @return Dividend % Divisor\r | |
263 | \r | |
264 | **/\r | |
9a462b41 | 265 | UINT32\r |
bda7fbcc | 266 | EFIAPI\r |
878ddf1f | 267 | InternalMathModU64x32 (\r |
268 | IN UINT64 Dividend,\r | |
269 | IN UINT32 Divisor\r | |
270 | )\r | |
271 | {\r | |
9a462b41 | 272 | return (UINT32)(Dividend % Divisor);\r |
878ddf1f | 273 | }\r |
274 | \r | |
1ea5ca46 | 275 | /**\r |
bda7fbcc | 276 | Divides a 64-bit unsigned integer by a 32-bit unsigned integer and\r |
1ea5ca46 | 277 | generates a 64-bit unsigned result and an optional 32-bit unsigned remainder.\r |
278 | \r | |
279 | This function divides the 64-bit unsigned value Dividend by the 32-bit\r | |
280 | unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder\r | |
281 | is not NULL, then the 32-bit unsigned remainder is returned in Remainder.\r | |
282 | This function returns the 64-bit unsigned quotient.\r | |
283 | \r | |
284 | @param Dividend A 64-bit unsigned value.\r | |
285 | @param Divisor A 32-bit unsigned value.\r | |
286 | @param Remainder A pointer to a 32-bit unsigned value. This parameter is\r | |
287 | optional and may be NULL.\r | |
288 | \r | |
289 | @return Dividend / Divisor\r | |
290 | \r | |
291 | **/\r | |
878ddf1f | 292 | UINT64\r |
bda7fbcc | 293 | EFIAPI\r |
878ddf1f | 294 | InternalMathDivRemU64x32 (\r |
295 | IN UINT64 Dividend,\r | |
296 | IN UINT32 Divisor,\r | |
1ea5ca46 | 297 | OUT UINT32 *Remainder OPTIONAL\r |
878ddf1f | 298 | )\r |
299 | {\r | |
300 | if (Remainder != NULL) {\r | |
301 | *Remainder = (UINT32)(Dividend % Divisor);\r | |
302 | }\r | |
303 | return Dividend / Divisor;\r | |
304 | }\r | |
305 | \r | |
1ea5ca46 | 306 | /**\r |
bda7fbcc | 307 | Divides a 64-bit unsigned integer by a 64-bit unsigned integer and\r |
1ea5ca46 | 308 | generates a 64-bit unsigned result and an optional 64-bit unsigned remainder.\r |
309 | \r | |
310 | This function divides the 64-bit unsigned value Dividend by the 64-bit\r | |
311 | unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder\r | |
312 | is not NULL, then the 64-bit unsigned remainder is returned in Remainder.\r | |
313 | This function returns the 64-bit unsigned quotient.\r | |
314 | \r | |
315 | @param Dividend A 64-bit unsigned value.\r | |
316 | @param Divisor A 64-bit unsigned value.\r | |
317 | @param Remainder A pointer to a 64-bit unsigned value. This parameter is\r | |
318 | optional and may be NULL.\r | |
319 | \r | |
320 | @return Dividend / Divisor\r | |
321 | \r | |
322 | **/\r | |
878ddf1f | 323 | UINT64\r |
bda7fbcc | 324 | EFIAPI\r |
878ddf1f | 325 | InternalMathDivRemU64x64 (\r |
326 | IN UINT64 Dividend,\r | |
327 | IN UINT64 Divisor,\r | |
1ea5ca46 | 328 | OUT UINT64 *Remainder OPTIONAL\r |
878ddf1f | 329 | )\r |
330 | {\r | |
331 | if (Remainder != NULL) {\r | |
332 | *Remainder = Dividend % Divisor;\r | |
333 | }\r | |
334 | return Dividend / Divisor;\r | |
335 | }\r | |
336 | \r | |
1ea5ca46 | 337 | /**\r |
bda7fbcc | 338 | Divides a 64-bit signed integer by a 64-bit signed integer and\r |
1ea5ca46 | 339 | generates a 64-bit signed result and a optional 64-bit signed remainder.\r |
340 | \r | |
341 | This function divides the 64-bit unsigned value Dividend by the 64-bit\r | |
342 | unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder\r | |
343 | is not NULL, then the 64-bit unsigned remainder is returned in Remainder.\r | |
344 | This function returns the 64-bit unsigned quotient.\r | |
345 | \r | |
346 | @param Dividend A 64-bit signed value.\r | |
347 | @param Divisor A 64-bit signed value.\r | |
348 | @param Remainder A pointer to a 64-bit signed value. This parameter is\r | |
349 | optional and may be NULL.\r | |
350 | \r | |
351 | @return Dividend / Divisor\r | |
352 | \r | |
353 | **/\r | |
878ddf1f | 354 | INT64\r |
878ddf1f | 355 | InternalMathDivRemS64x64 (\r |
356 | IN INT64 Dividend,\r | |
357 | IN INT64 Divisor,\r | |
1ea5ca46 | 358 | OUT INT64 *Remainder OPTIONAL\r |
878ddf1f | 359 | )\r |
360 | {\r | |
361 | if (Remainder != NULL) {\r | |
362 | *Remainder = Dividend % Divisor;\r | |
363 | }\r | |
364 | return Dividend / Divisor;\r | |
365 | }\r |