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e1f414b6 | 1 | /** @file\r |
2 | Leaf math worker functions that require 64-bit arithmetic support from the\r | |
3 | compiler.\r | |
4 | \r | |
127010dd | 5 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r |
bb817c56 | 6 | This program and the accompanying materials\r |
e1f414b6 | 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 | |
127010dd | 9 | http://opensource.org/licenses/bsd-license.php.\r |
e1f414b6 | 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 | |
e1f414b6 | 14 | **/\r |
15 | \r | |
e1f414b6 | 16 | #include "BaseLibInternals.h"\r |
17 | \r | |
18 | /**\r | |
19 | Shifts a 64-bit integer left between 0 and 63 bits. The low bits\r | |
20 | are filled with zeros. The shifted value is returned.\r | |
21 | \r | |
22 | This function shifts the 64-bit value Operand to the left by Count bits. The\r | |
23 | low Count bits are set to zero. The shifted value is returned.\r | |
24 | \r | |
25 | @param Operand The 64-bit operand to shift left.\r | |
26 | @param Count The number of bits to shift left.\r | |
27 | \r | |
127010dd | 28 | @return Operand << Count.\r |
e1f414b6 | 29 | \r |
30 | **/\r | |
31 | UINT64\r | |
32 | EFIAPI\r | |
33 | InternalMathLShiftU64 (\r | |
34 | IN UINT64 Operand,\r | |
35 | IN UINTN Count\r | |
36 | )\r | |
37 | {\r | |
38 | return Operand << Count;\r | |
39 | }\r | |
40 | \r | |
41 | /**\r | |
42 | Shifts a 64-bit integer right between 0 and 63 bits. This high bits\r | |
43 | are filled with zeros. The shifted value is returned.\r | |
44 | \r | |
45 | This function shifts the 64-bit value Operand to the right by Count bits. The\r | |
46 | high Count bits are set to zero. The shifted value is returned.\r | |
47 | \r | |
48 | @param Operand The 64-bit operand to shift right.\r | |
49 | @param Count The number of bits to shift right.\r | |
50 | \r | |
127010dd | 51 | @return Operand >> Count.\r |
e1f414b6 | 52 | \r |
53 | **/\r | |
54 | UINT64\r | |
55 | EFIAPI\r | |
56 | InternalMathRShiftU64 (\r | |
57 | IN UINT64 Operand,\r | |
58 | IN UINTN Count\r | |
59 | )\r | |
60 | {\r | |
61 | return Operand >> Count;\r | |
62 | }\r | |
63 | \r | |
64 | /**\r | |
65 | Shifts a 64-bit integer right between 0 and 63 bits. The high bits\r | |
66 | are filled with original integer's bit 63. The shifted value is returned.\r | |
67 | \r | |
68 | This function shifts the 64-bit value Operand to the right by Count bits. The\r | |
69 | high Count bits are set to bit 63 of Operand. The shifted value is returned.\r | |
70 | \r | |
e1f414b6 | 71 | @param Operand The 64-bit operand to shift right.\r |
72 | @param Count The number of bits to shift right.\r | |
73 | \r | |
127010dd | 74 | @return Operand arithmetically shifted right by Count.\r |
e1f414b6 | 75 | \r |
76 | **/\r | |
77 | UINT64\r | |
78 | EFIAPI\r | |
79 | InternalMathARShiftU64 (\r | |
80 | IN UINT64 Operand,\r | |
81 | IN UINTN Count\r | |
82 | )\r | |
83 | {\r | |
84 | INTN TestValue;\r | |
85 | \r | |
86 | //\r | |
87 | // Test if this compiler supports arithmetic shift\r | |
88 | //\r | |
b331b99f | 89 | TestValue = (INTN)((INT64)(1ULL << 63) >> 63);\r |
e1f414b6 | 90 | if (TestValue == -1) {\r |
91 | //\r | |
92 | // Arithmetic shift is supported\r | |
93 | //\r | |
94 | return (UINT64)((INT64)Operand >> Count);\r | |
95 | }\r | |
96 | \r | |
97 | //\r | |
98 | // Arithmetic is not supported\r | |
99 | //\r | |
100 | return (Operand >> Count) |\r | |
101 | ((INTN)Operand < 0 ? ~((UINTN)-1 >> Count) : 0);\r | |
102 | }\r | |
103 | \r | |
104 | \r | |
105 | /**\r | |
106 | Rotates a 64-bit integer left between 0 and 63 bits, filling\r | |
107 | the low bits with the high bits that were rotated.\r | |
108 | \r | |
109 | This function rotates the 64-bit value Operand to the left by Count bits. The\r | |
110 | low Count bits are fill with the high Count bits of Operand. The rotated\r | |
111 | value is returned.\r | |
112 | \r | |
113 | @param Operand The 64-bit operand to rotate left.\r | |
114 | @param Count The number of bits to rotate left.\r | |
115 | \r | |
127010dd | 116 | @return Operand <<< Count.\r |
e1f414b6 | 117 | \r |
118 | **/\r | |
119 | UINT64\r | |
120 | EFIAPI\r | |
121 | InternalMathLRotU64 (\r | |
122 | IN UINT64 Operand,\r | |
123 | IN UINTN Count\r | |
124 | )\r | |
125 | {\r | |
126 | return (Operand << Count) | (Operand >> (64 - Count));\r | |
127 | }\r | |
128 | \r | |
129 | /**\r | |
130 | Rotates a 64-bit integer right between 0 and 63 bits, filling\r | |
131 | the high bits with the high low bits that were rotated.\r | |
132 | \r | |
133 | This function rotates the 64-bit value Operand to the right by Count bits.\r | |
134 | The high Count bits are fill with the low Count bits of Operand. The rotated\r | |
135 | value is returned.\r | |
136 | \r | |
137 | @param Operand The 64-bit operand to rotate right.\r | |
138 | @param Count The number of bits to rotate right.\r | |
139 | \r | |
127010dd | 140 | @return Operand >>> Count.\r |
e1f414b6 | 141 | \r |
142 | **/\r | |
143 | UINT64\r | |
144 | EFIAPI\r | |
145 | InternalMathRRotU64 (\r | |
146 | IN UINT64 Operand,\r | |
147 | IN UINTN Count\r | |
148 | )\r | |
149 | {\r | |
150 | return (Operand >> Count) | (Operand << (64 - Count));\r | |
151 | }\r | |
152 | \r | |
153 | /**\r | |
154 | Switches the endianess of a 64-bit integer.\r | |
155 | \r | |
156 | This function swaps the bytes in a 64-bit unsigned value to switch the value\r | |
157 | from little endian to big endian or vice versa. The byte swapped value is\r | |
158 | returned.\r | |
159 | \r | |
160 | @param Operand A 64-bit unsigned value.\r | |
161 | \r | |
2fc60b70 | 162 | @return The byte swapped Operand.\r |
e1f414b6 | 163 | \r |
164 | **/\r | |
165 | UINT64\r | |
166 | EFIAPI\r | |
167 | InternalMathSwapBytes64 (\r | |
168 | IN UINT64 Operand\r | |
169 | )\r | |
170 | {\r | |
171 | UINT64 LowerBytes;\r | |
172 | UINT64 HigherBytes;\r | |
173 | \r | |
174 | LowerBytes = (UINT64) SwapBytes32 ((UINT32) Operand);\r | |
175 | HigherBytes = (UINT64) SwapBytes32 ((UINT32) (Operand >> 32));\r | |
176 | \r | |
177 | return (LowerBytes << 32 | HigherBytes);\r | |
178 | }\r | |
179 | \r | |
180 | /**\r | |
127010dd | 181 | Multiplies a 64-bit unsigned integer by a 32-bit unsigned integer\r |
e1f414b6 | 182 | and generates a 64-bit unsigned result.\r |
183 | \r | |
127010dd | 184 | This function multiplies the 64-bit unsigned value Multiplicand by the 32-bit\r |
e1f414b6 | 185 | unsigned value Multiplier and generates a 64-bit unsigned result. This 64-\r |
186 | bit unsigned result is returned.\r | |
187 | \r | |
188 | @param Multiplicand A 64-bit unsigned value.\r | |
189 | @param Multiplier A 32-bit unsigned value.\r | |
190 | \r | |
191 | @return Multiplicand * Multiplier\r | |
192 | \r | |
193 | **/\r | |
194 | UINT64\r | |
195 | EFIAPI\r | |
196 | InternalMathMultU64x32 (\r | |
197 | IN UINT64 Multiplicand,\r | |
198 | IN UINT32 Multiplier\r | |
199 | )\r | |
200 | {\r | |
201 | return Multiplicand * Multiplier;\r | |
202 | }\r | |
203 | \r | |
204 | \r | |
205 | /**\r | |
127010dd | 206 | Multiplies a 64-bit unsigned integer by a 64-bit unsigned integer\r |
e1f414b6 | 207 | and generates a 64-bit unsigned result.\r |
208 | \r | |
127010dd | 209 | This function multiplies the 64-bit unsigned value Multiplicand by the 64-bit\r |
e1f414b6 | 210 | unsigned value Multiplier and generates a 64-bit unsigned result. This 64-\r |
211 | bit unsigned result is returned.\r | |
212 | \r | |
213 | @param Multiplicand A 64-bit unsigned value.\r | |
214 | @param Multiplier A 64-bit unsigned value.\r | |
215 | \r | |
127010dd | 216 | @return Multiplicand * Multiplier.\r |
e1f414b6 | 217 | \r |
218 | **/\r | |
219 | UINT64\r | |
220 | EFIAPI\r | |
221 | InternalMathMultU64x64 (\r | |
222 | IN UINT64 Multiplicand,\r | |
223 | IN UINT64 Multiplier\r | |
224 | )\r | |
225 | {\r | |
226 | return Multiplicand * Multiplier;\r | |
227 | }\r | |
228 | \r | |
229 | /**\r | |
230 | Divides a 64-bit unsigned integer by a 32-bit unsigned integer and\r | |
231 | generates a 64-bit unsigned result.\r | |
232 | \r | |
233 | This function divides the 64-bit unsigned value Dividend by the 32-bit\r | |
234 | unsigned value Divisor and generates a 64-bit unsigned quotient. This\r | |
235 | function returns the 64-bit unsigned quotient.\r | |
236 | \r | |
2fc60b70 | 237 | @param Dividend A 64-bit unsigned value.\r |
e1f414b6 | 238 | @param Divisor A 32-bit unsigned value.\r |
239 | \r | |
127010dd | 240 | @return Dividend / Divisor.\r |
e1f414b6 | 241 | \r |
242 | **/\r | |
243 | UINT64\r | |
244 | EFIAPI\r | |
245 | InternalMathDivU64x32 (\r | |
246 | IN UINT64 Dividend,\r | |
247 | IN UINT32 Divisor\r | |
248 | )\r | |
249 | {\r | |
250 | return Dividend / Divisor;\r | |
251 | }\r | |
252 | \r | |
253 | /**\r | |
2fc60b70 | 254 | Divides a 64-bit unsigned integer by a 32-bit unsigned integer and\r |
255 | generates a 32-bit unsigned remainder.\r | |
e1f414b6 | 256 | \r |
257 | This function divides the 64-bit unsigned value Dividend by the 32-bit\r | |
258 | unsigned value Divisor and generates a 32-bit remainder. This function\r | |
259 | returns the 32-bit unsigned remainder.\r | |
260 | \r | |
261 | @param Dividend A 64-bit unsigned value.\r | |
262 | @param Divisor A 32-bit unsigned value.\r | |
263 | \r | |
127010dd | 264 | @return Dividend % Divisor.\r |
e1f414b6 | 265 | \r |
266 | **/\r | |
267 | UINT32\r | |
268 | EFIAPI\r | |
269 | InternalMathModU64x32 (\r | |
270 | IN UINT64 Dividend,\r | |
271 | IN UINT32 Divisor\r | |
272 | )\r | |
273 | {\r | |
274 | return (UINT32)(Dividend % Divisor);\r | |
275 | }\r | |
276 | \r | |
277 | /**\r | |
278 | Divides a 64-bit unsigned integer by a 32-bit unsigned integer and\r | |
279 | generates a 64-bit unsigned result and an optional 32-bit unsigned remainder.\r | |
280 | \r | |
281 | This function divides the 64-bit unsigned value Dividend by the 32-bit\r | |
282 | unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder\r | |
283 | is not NULL, then the 32-bit unsigned remainder is returned in Remainder.\r | |
284 | This function returns the 64-bit unsigned quotient.\r | |
285 | \r | |
286 | @param Dividend A 64-bit unsigned value.\r | |
287 | @param Divisor A 32-bit unsigned value.\r | |
288 | @param Remainder A pointer to a 32-bit unsigned value. This parameter is\r | |
289 | optional and may be NULL.\r | |
290 | \r | |
127010dd | 291 | @return Dividend / Divisor.\r |
e1f414b6 | 292 | \r |
293 | **/\r | |
294 | UINT64\r | |
295 | EFIAPI\r | |
296 | InternalMathDivRemU64x32 (\r | |
297 | IN UINT64 Dividend,\r | |
298 | IN UINT32 Divisor,\r | |
2fc60b70 | 299 | OUT UINT32 *Remainder OPTIONAL\r |
e1f414b6 | 300 | )\r |
301 | {\r | |
302 | if (Remainder != NULL) {\r | |
303 | *Remainder = (UINT32)(Dividend % Divisor);\r | |
304 | }\r | |
305 | return Dividend / Divisor;\r | |
306 | }\r | |
307 | \r | |
308 | /**\r | |
309 | Divides a 64-bit unsigned integer by a 64-bit unsigned integer and\r | |
310 | generates a 64-bit unsigned result and an optional 64-bit unsigned remainder.\r | |
311 | \r | |
312 | This function divides the 64-bit unsigned value Dividend by the 64-bit\r | |
313 | unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder\r | |
314 | is not NULL, then the 64-bit unsigned remainder is returned in Remainder.\r | |
315 | This function returns the 64-bit unsigned quotient.\r | |
316 | \r | |
317 | @param Dividend A 64-bit unsigned value.\r | |
318 | @param Divisor A 64-bit unsigned value.\r | |
319 | @param Remainder A pointer to a 64-bit unsigned value. This parameter is\r | |
320 | optional and may be NULL.\r | |
321 | \r | |
322 | @return Dividend / Divisor\r | |
323 | \r | |
324 | **/\r | |
325 | UINT64\r | |
326 | EFIAPI\r | |
327 | InternalMathDivRemU64x64 (\r | |
328 | IN UINT64 Dividend,\r | |
329 | IN UINT64 Divisor,\r | |
2fc60b70 | 330 | OUT UINT64 *Remainder OPTIONAL\r |
e1f414b6 | 331 | )\r |
332 | {\r | |
333 | if (Remainder != NULL) {\r | |
334 | *Remainder = Dividend % Divisor;\r | |
335 | }\r | |
336 | return Dividend / Divisor;\r | |
337 | }\r | |
338 | \r | |
339 | /**\r | |
340 | Divides a 64-bit signed integer by a 64-bit signed integer and\r | |
2fc60b70 | 341 | generates a 64-bit signed result and an optional 64-bit signed remainder.\r |
e1f414b6 | 342 | \r |
24dcb5e5 | 343 | This function divides the 64-bit signed value Dividend by the 64-bit\r |
344 | signed value Divisor and generates a 64-bit signed quotient. If Remainder\r | |
345 | is not NULL, then the 64-bit signed remainder is returned in Remainder.\r | |
346 | This function returns the 64-bit signed quotient.\r | |
e1f414b6 | 347 | \r |
348 | @param Dividend A 64-bit signed value.\r | |
349 | @param Divisor A 64-bit signed value.\r | |
350 | @param Remainder A pointer to a 64-bit signed value. This parameter is\r | |
351 | optional and may be NULL.\r | |
352 | \r | |
127010dd | 353 | @return Dividend / Divisor.\r |
e1f414b6 | 354 | \r |
355 | **/\r | |
356 | INT64\r | |
38bbd3d9 | 357 | EFIAPI\r |
e1f414b6 | 358 | InternalMathDivRemS64x64 (\r |
359 | IN INT64 Dividend,\r | |
360 | IN INT64 Divisor,\r | |
361 | OUT INT64 *Remainder OPTIONAL\r | |
362 | )\r | |
363 | {\r | |
364 | if (Remainder != NULL) {\r | |
365 | *Remainder = Dividend % Divisor;\r | |
366 | }\r | |
367 | return Dividend / Divisor;\r | |
368 | }\r |