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