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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 | |
58251024 | 88 | INTN TestValue;\r |
89 | \r | |
878ddf1f | 90 | //\r |
91 | // Test if this compiler supports arithmetic shift\r | |
92 | //\r | |
58251024 | 93 | TestValue = (((-1) << (sizeof (-1) * 8 - 1)) >> (sizeof (-1) * 8 - 1));\r |
94 | if (TestValue == -1) {\r | |
878ddf1f | 95 | //\r |
96 | // Arithmetic shift is supported\r | |
97 | //\r | |
98 | return (UINT64)((INT64)Operand >> Count);\r | |
99 | }\r | |
100 | \r | |
101 | //\r | |
102 | // Arithmetic is not supported\r | |
103 | //\r | |
104 | return (Operand >> Count) |\r | |
105 | ((INTN)Operand < 0 ? ~((UINTN)-1 >> Count) : 0);\r | |
106 | }\r | |
107 | \r | |
1ea5ca46 | 108 | \r |
109 | /**\r | |
bda7fbcc | 110 | Rotates a 64-bit integer left between 0 and 63 bits, filling\r |
1ea5ca46 | 111 | the low bits with the high bits that were rotated.\r |
112 | \r | |
113 | This function rotates the 64-bit value Operand to the left by Count bits. The\r | |
114 | low Count bits are fill with the high Count bits of Operand. The rotated\r | |
115 | value is returned.\r | |
116 | \r | |
117 | @param Operand The 64-bit operand to rotate left.\r | |
118 | @param Count The number of bits to rotate left.\r | |
119 | \r | |
120 | @return Operand <<< Count\r | |
121 | \r | |
122 | **/\r | |
878ddf1f | 123 | UINT64\r |
124 | EFIAPI\r | |
125 | InternalMathLRotU64 (\r | |
126 | IN UINT64 Operand,\r | |
127 | IN UINTN Count\r | |
128 | )\r | |
129 | {\r | |
130 | return (Operand << Count) | (Operand >> (64 - Count));\r | |
131 | }\r | |
132 | \r | |
1ea5ca46 | 133 | /**\r |
bda7fbcc | 134 | Rotates a 64-bit integer right between 0 and 63 bits, filling\r |
1ea5ca46 | 135 | the high bits with the high low bits that were rotated.\r |
136 | \r | |
137 | This function rotates the 64-bit value Operand to the right by Count bits.\r | |
138 | The high Count bits are fill with the low Count bits of Operand. The rotated\r | |
139 | value is returned.\r | |
140 | \r | |
141 | @param Operand The 64-bit operand to rotate right.\r | |
142 | @param Count The number of bits to rotate right.\r | |
143 | \r | |
144 | @return Operand >>> Count\r | |
145 | \r | |
146 | **/\r | |
878ddf1f | 147 | UINT64\r |
148 | EFIAPI\r | |
149 | InternalMathRRotU64 (\r | |
150 | IN UINT64 Operand,\r | |
151 | IN UINTN Count\r | |
152 | )\r | |
153 | {\r | |
154 | return (Operand >> Count) | (Operand << (64 - Count));\r | |
155 | }\r | |
156 | \r | |
1ea5ca46 | 157 | /**\r |
bda7fbcc | 158 | Switches the endianess of a 64-bit integer.\r |
1ea5ca46 | 159 | \r |
160 | This function swaps the bytes in a 64-bit unsigned value to switch the value\r | |
161 | from little endian to big endian or vice versa. The byte swapped value is\r | |
162 | returned.\r | |
163 | \r | |
164 | @param Operand A 64-bit unsigned value.\r | |
165 | \r | |
166 | @return The byte swaped Operand.\r | |
167 | \r | |
168 | **/\r | |
878ddf1f | 169 | UINT64\r |
170 | EFIAPI\r | |
171 | InternalMathSwapBytes64 (\r | |
172 | IN UINT64 Operand\r | |
173 | )\r | |
174 | {\r | |
58251024 | 175 | UINT64 LowerBytes;\r |
176 | UINT64 HigherBytes;\r | |
177 | \r | |
178 | LowerBytes = (UINT64) SwapBytes32 ((UINT32) Operand);\r | |
179 | HigherBytes = (UINT64) SwapBytes32 ((UINT32) (Operand >> 32));\r | |
180 | \r | |
181 | return (LowerBytes << 32 | HigherBytes);\r | |
878ddf1f | 182 | }\r |
183 | \r | |
1ea5ca46 | 184 | /**\r |
bda7fbcc | 185 | Multiples a 64-bit unsigned integer by a 32-bit unsigned integer\r |
1ea5ca46 | 186 | and generates a 64-bit unsigned result.\r |
187 | \r | |
188 | This function multiples the 64-bit unsigned value Multiplicand by the 32-bit\r | |
189 | unsigned value Multiplier and generates a 64-bit unsigned result. This 64-\r | |
190 | bit unsigned result is returned.\r | |
191 | \r | |
192 | @param Multiplicand A 64-bit unsigned value.\r | |
193 | @param Multiplier A 32-bit unsigned value.\r | |
194 | \r | |
195 | @return Multiplicand * Multiplier\r | |
196 | \r | |
197 | **/\r | |
878ddf1f | 198 | UINT64\r |
199 | EFIAPI\r | |
200 | InternalMathMultU64x32 (\r | |
201 | IN UINT64 Multiplicand,\r | |
202 | IN UINT32 Multiplier\r | |
203 | )\r | |
204 | {\r | |
205 | return Multiplicand * Multiplier;\r | |
206 | }\r | |
207 | \r | |
1ea5ca46 | 208 | \r |
209 | /**\r | |
bda7fbcc | 210 | Multiples a 64-bit unsigned integer by a 64-bit unsigned integer\r |
1ea5ca46 | 211 | and generates a 64-bit unsigned result.\r |
212 | \r | |
213 | This function multiples the 64-bit unsigned value Multiplicand by the 64-bit\r | |
214 | unsigned value Multiplier and generates a 64-bit unsigned result. This 64-\r | |
215 | bit unsigned result is returned.\r | |
216 | \r | |
217 | @param Multiplicand A 64-bit unsigned value.\r | |
218 | @param Multiplier A 64-bit unsigned value.\r | |
219 | \r | |
220 | @return Multiplicand * Multiplier\r | |
221 | \r | |
222 | **/\r | |
878ddf1f | 223 | UINT64\r |
224 | EFIAPI\r | |
225 | InternalMathMultU64x64 (\r | |
226 | IN UINT64 Multiplicand,\r | |
227 | IN UINT64 Multiplier\r | |
228 | )\r | |
229 | {\r | |
230 | return Multiplicand * Multiplier;\r | |
231 | }\r | |
232 | \r | |
1ea5ca46 | 233 | /**\r |
bda7fbcc | 234 | Divides a 64-bit unsigned integer by a 32-bit unsigned integer and\r |
1ea5ca46 | 235 | generates a 64-bit unsigned result.\r |
bda7fbcc | 236 | \r |
1ea5ca46 | 237 | This function divides the 64-bit unsigned value Dividend by the 32-bit\r |
238 | unsigned value Divisor and generates a 64-bit unsigned quotient. This\r | |
239 | function returns the 64-bit unsigned quotient.\r | |
240 | \r | |
241 | @param Dividend A 64-bit unsigned value.\r | |
242 | @param Divisor A 32-bit unsigned value.\r | |
243 | \r | |
244 | @return Dividend / Divisor\r | |
245 | \r | |
246 | **/\r | |
878ddf1f | 247 | UINT64\r |
248 | EFIAPI\r | |
249 | InternalMathDivU64x32 (\r | |
250 | IN UINT64 Dividend,\r | |
251 | IN UINT32 Divisor\r | |
252 | )\r | |
253 | {\r | |
254 | return Dividend / Divisor;\r | |
255 | }\r | |
256 | \r | |
1ea5ca46 | 257 | /**\r |
bda7fbcc | 258 | Divides a 64-bit unsigned integer by a 32-bit unsigned integer\r |
1ea5ca46 | 259 | and generates a 32-bit unsigned remainder.\r |
260 | \r | |
261 | This function divides the 64-bit unsigned value Dividend by the 32-bit\r | |
262 | unsigned value Divisor and generates a 32-bit remainder. This function\r | |
263 | returns the 32-bit unsigned remainder.\r | |
264 | \r | |
265 | @param Dividend A 64-bit unsigned value.\r | |
266 | @param Divisor A 32-bit unsigned value.\r | |
267 | \r | |
268 | @return Dividend % Divisor\r | |
269 | \r | |
270 | **/\r | |
9a462b41 | 271 | UINT32\r |
bda7fbcc | 272 | EFIAPI\r |
878ddf1f | 273 | InternalMathModU64x32 (\r |
274 | IN UINT64 Dividend,\r | |
275 | IN UINT32 Divisor\r | |
276 | )\r | |
277 | {\r | |
9a462b41 | 278 | return (UINT32)(Dividend % Divisor);\r |
878ddf1f | 279 | }\r |
280 | \r | |
1ea5ca46 | 281 | /**\r |
bda7fbcc | 282 | Divides a 64-bit unsigned integer by a 32-bit unsigned integer and\r |
1ea5ca46 | 283 | generates a 64-bit unsigned result and an optional 32-bit unsigned remainder.\r |
284 | \r | |
285 | This function divides the 64-bit unsigned value Dividend by the 32-bit\r | |
286 | unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder\r | |
287 | is not NULL, then the 32-bit unsigned remainder is returned in Remainder.\r | |
288 | This function returns the 64-bit unsigned quotient.\r | |
289 | \r | |
290 | @param Dividend A 64-bit unsigned value.\r | |
291 | @param Divisor A 32-bit unsigned value.\r | |
292 | @param Remainder A pointer to a 32-bit unsigned value. This parameter is\r | |
293 | optional and may be NULL.\r | |
294 | \r | |
295 | @return Dividend / Divisor\r | |
296 | \r | |
297 | **/\r | |
878ddf1f | 298 | UINT64\r |
bda7fbcc | 299 | EFIAPI\r |
878ddf1f | 300 | InternalMathDivRemU64x32 (\r |
301 | IN UINT64 Dividend,\r | |
302 | IN UINT32 Divisor,\r | |
1ea5ca46 | 303 | OUT UINT32 *Remainder OPTIONAL\r |
878ddf1f | 304 | )\r |
305 | {\r | |
306 | if (Remainder != NULL) {\r | |
307 | *Remainder = (UINT32)(Dividend % Divisor);\r | |
308 | }\r | |
309 | return Dividend / Divisor;\r | |
310 | }\r | |
311 | \r | |
1ea5ca46 | 312 | /**\r |
bda7fbcc | 313 | Divides a 64-bit unsigned integer by a 64-bit unsigned integer and\r |
1ea5ca46 | 314 | generates a 64-bit unsigned result and an optional 64-bit unsigned remainder.\r |
315 | \r | |
316 | This function divides the 64-bit unsigned value Dividend by the 64-bit\r | |
317 | unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder\r | |
318 | is not NULL, then the 64-bit unsigned remainder is returned in Remainder.\r | |
319 | This function returns the 64-bit unsigned quotient.\r | |
320 | \r | |
321 | @param Dividend A 64-bit unsigned value.\r | |
322 | @param Divisor A 64-bit unsigned value.\r | |
323 | @param Remainder A pointer to a 64-bit unsigned value. This parameter is\r | |
324 | optional and may be NULL.\r | |
325 | \r | |
326 | @return Dividend / Divisor\r | |
327 | \r | |
328 | **/\r | |
878ddf1f | 329 | UINT64\r |
bda7fbcc | 330 | EFIAPI\r |
878ddf1f | 331 | InternalMathDivRemU64x64 (\r |
332 | IN UINT64 Dividend,\r | |
333 | IN UINT64 Divisor,\r | |
1ea5ca46 | 334 | OUT UINT64 *Remainder OPTIONAL\r |
878ddf1f | 335 | )\r |
336 | {\r | |
337 | if (Remainder != NULL) {\r | |
338 | *Remainder = Dividend % Divisor;\r | |
339 | }\r | |
340 | return Dividend / Divisor;\r | |
341 | }\r | |
342 | \r | |
1ea5ca46 | 343 | /**\r |
bda7fbcc | 344 | Divides a 64-bit signed integer by a 64-bit signed integer and\r |
1ea5ca46 | 345 | generates a 64-bit signed result and a optional 64-bit signed remainder.\r |
346 | \r | |
347 | This function divides the 64-bit unsigned value Dividend by the 64-bit\r | |
348 | unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder\r | |
349 | is not NULL, then the 64-bit unsigned remainder is returned in Remainder.\r | |
350 | This function returns the 64-bit unsigned quotient.\r | |
351 | \r | |
352 | @param Dividend A 64-bit signed value.\r | |
353 | @param Divisor A 64-bit signed value.\r | |
354 | @param Remainder A pointer to a 64-bit signed value. This parameter is\r | |
355 | optional and may be NULL.\r | |
356 | \r | |
357 | @return Dividend / Divisor\r | |
358 | \r | |
359 | **/\r | |
878ddf1f | 360 | INT64\r |
878ddf1f | 361 | InternalMathDivRemS64x64 (\r |
362 | IN INT64 Dividend,\r | |
363 | IN INT64 Divisor,\r | |
1ea5ca46 | 364 | OUT INT64 *Remainder OPTIONAL\r |
878ddf1f | 365 | )\r |
366 | {\r | |
367 | if (Remainder != NULL) {\r | |
368 | *Remainder = Dividend % Divisor;\r | |
369 | }\r | |
370 | return Dividend / Divisor;\r | |
371 | }\r |