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1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ; Copyright(c) 2011-2016 Intel Corporation All rights reserved. | |
3 | ; | |
4 | ; Redistribution and use in source and binary forms, with or without | |
5 | ; modification, are permitted provided that the following conditions | |
6 | ; are met: | |
7 | ; * Redistributions of source code must retain the above copyright | |
8 | ; notice, this list of conditions and the following disclaimer. | |
9 | ; * Redistributions in binary form must reproduce the above copyright | |
10 | ; notice, this list of conditions and the following disclaimer in | |
11 | ; the documentation and/or other materials provided with the | |
12 | ; distribution. | |
13 | ; * Neither the name of Intel Corporation nor the names of its | |
14 | ; contributors may be used to endorse or promote products derived | |
15 | ; from this software without specific prior written permission. | |
16 | ; | |
17 | ; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
18 | ; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
19 | ; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
20 | ; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
21 | ; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
22 | ; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
23 | ; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
24 | ; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
25 | ; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
26 | ; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
27 | ; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
28 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
29 | ||
30 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
31 | ; Function API: | |
32 | ; UINT32 crc32_gzip( | |
33 | ; UINT32 init_crc, //initial CRC value, 32 bits | |
34 | ; const unsigned char *buf, //buffer pointer to calculate CRC on | |
35 | ; UINT64 len //buffer length in bytes (64-bit data) | |
36 | ; ); | |
37 | ; | |
38 | ; Authors: | |
39 | ; Erdinc Ozturk | |
40 | ; Vinodh Gopal | |
41 | ; James Guilford | |
42 | ; | |
43 | ; Reference paper titled "Fast CRC Computation for Generic Polynomials Using PCLMULQDQ Instruction" | |
44 | ; URL: http://download.intel.com/design/intarch/papers/323102.pdf | |
45 | ; | |
46 | ; | |
47 | ; sample yasm command line: | |
48 | ; yasm -f x64 -f elf64 -X gnu -g dwarf2 crc32_gzip | |
49 | ; | |
50 | ; As explained here: | |
51 | ; http://docs.oracle.com/javase/7/docs/api/java/util/zip/package-summary.html | |
52 | ; CRC-32 checksum is described in RFC 1952 | |
53 | ; Implementing RFC 1952 CRC: | |
54 | ; http://www.ietf.org/rfc/rfc1952.txt | |
55 | ||
56 | %include "reg_sizes.asm" | |
57 | ||
58 | [bits 64] | |
59 | default rel | |
60 | ||
61 | section .text | |
62 | ||
63 | ||
64 | %ifidn __OUTPUT_FORMAT__, win64 | |
65 | %xdefine arg1 rcx | |
66 | %xdefine arg2 rdx | |
67 | %xdefine arg3 r8 | |
68 | ||
69 | %xdefine arg1_low32 ecx | |
70 | %else | |
71 | %xdefine arg1 rdi | |
72 | %xdefine arg2 rsi | |
73 | %xdefine arg3 rdx | |
74 | ||
75 | %xdefine arg1_low32 edi | |
76 | %endif | |
77 | ||
78 | %define TMP 16*0 | |
79 | %ifidn __OUTPUT_FORMAT__, win64 | |
80 | %define XMM_SAVE 16*2 | |
81 | %define VARIABLE_OFFSET 16*10+8 | |
82 | %else | |
83 | %define VARIABLE_OFFSET 16*2+8 | |
84 | %endif | |
85 | ||
86 | align 16 | |
87 | global crc32_gzip | |
88 | crc32_gzip: | |
89 | ||
90 | ; unsigned long c = crc ^ 0xffffffffL; | |
91 | not arg1_low32 ; | |
92 | ||
93 | ||
94 | sub rsp, VARIABLE_OFFSET | |
95 | %ifidn __OUTPUT_FORMAT__, win64 | |
96 | ; push the xmm registers into the stack to maintain | |
97 | movdqa [rsp + XMM_SAVE + 16*0], xmm6 | |
98 | movdqa [rsp + XMM_SAVE + 16*1], xmm7 | |
99 | movdqa [rsp + XMM_SAVE + 16*2], xmm8 | |
100 | movdqa [rsp + XMM_SAVE + 16*3], xmm9 | |
101 | movdqa [rsp + XMM_SAVE + 16*4], xmm10 | |
102 | movdqa [rsp + XMM_SAVE + 16*5], xmm11 | |
103 | movdqa [rsp + XMM_SAVE + 16*6], xmm12 | |
104 | movdqa [rsp + XMM_SAVE + 16*7], xmm13 | |
105 | %endif | |
106 | ||
107 | ; check if smaller than 256B | |
108 | cmp arg3, 256 | |
109 | ||
110 | ; for sizes less than 256, we can't fold 128B at a time... | |
111 | jl _less_than_256 | |
112 | ||
113 | ||
114 | ; load the initial crc value | |
115 | movd xmm10, arg1_low32 ; initial crc | |
116 | ||
117 | ; receive the initial 64B data, xor the initial crc value | |
118 | movdqu xmm0, [arg2+16*0] | |
119 | movdqu xmm1, [arg2+16*1] | |
120 | movdqu xmm2, [arg2+16*2] | |
121 | movdqu xmm3, [arg2+16*3] | |
122 | movdqu xmm4, [arg2+16*4] | |
123 | movdqu xmm5, [arg2+16*5] | |
124 | movdqu xmm6, [arg2+16*6] | |
125 | movdqu xmm7, [arg2+16*7] | |
126 | ||
127 | ; XOR the initial_crc value | |
128 | pxor xmm0, xmm10 | |
129 | movdqa xmm10, [rk3] ;xmm10 has rk3 and rk4 | |
130 | ;imm value of pclmulqdq instruction will determine which constant to use | |
131 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
132 | ; we subtract 256 instead of 128 to save one instruction from the loop | |
133 | sub arg3, 256 | |
134 | ||
135 | ; at this section of the code, there is 128*x+y (0<=y<128) bytes of buffer. The _fold_128_B_loop | |
136 | ; loop will fold 128B at a time until we have 128+y Bytes of buffer | |
137 | ||
138 | ||
139 | ; fold 128B at a time. This section of the code folds 8 xmm registers in parallel | |
140 | _fold_128_B_loop: | |
141 | ||
142 | ; update the buffer pointer | |
143 | add arg2, 128 | |
144 | ||
145 | movdqu xmm9, [arg2+16*0] | |
146 | movdqu xmm12, [arg2+16*1] | |
147 | movdqa xmm8, xmm0 | |
148 | movdqa xmm13, xmm1 | |
149 | pclmulqdq xmm0, xmm10, 0x10 | |
150 | pclmulqdq xmm8, xmm10 , 0x1 | |
151 | pclmulqdq xmm1, xmm10, 0x10 | |
152 | pclmulqdq xmm13, xmm10 , 0x1 | |
153 | pxor xmm0, xmm9 | |
154 | xorps xmm0, xmm8 | |
155 | pxor xmm1, xmm12 | |
156 | xorps xmm1, xmm13 | |
157 | ||
158 | movdqu xmm9, [arg2+16*2] | |
159 | movdqu xmm12, [arg2+16*3] | |
160 | movdqa xmm8, xmm2 | |
161 | movdqa xmm13, xmm3 | |
162 | pclmulqdq xmm2, xmm10, 0x10 | |
163 | pclmulqdq xmm8, xmm10 , 0x1 | |
164 | pclmulqdq xmm3, xmm10, 0x10 | |
165 | pclmulqdq xmm13, xmm10 , 0x1 | |
166 | pxor xmm2, xmm9 | |
167 | xorps xmm2, xmm8 | |
168 | pxor xmm3, xmm12 | |
169 | xorps xmm3, xmm13 | |
170 | ||
171 | movdqu xmm9, [arg2+16*4] | |
172 | movdqu xmm12, [arg2+16*5] | |
173 | movdqa xmm8, xmm4 | |
174 | movdqa xmm13, xmm5 | |
175 | pclmulqdq xmm4, xmm10, 0x10 | |
176 | pclmulqdq xmm8, xmm10 , 0x1 | |
177 | pclmulqdq xmm5, xmm10, 0x10 | |
178 | pclmulqdq xmm13, xmm10 , 0x1 | |
179 | pxor xmm4, xmm9 | |
180 | xorps xmm4, xmm8 | |
181 | pxor xmm5, xmm12 | |
182 | xorps xmm5, xmm13 | |
183 | ||
184 | movdqu xmm9, [arg2+16*6] | |
185 | movdqu xmm12, [arg2+16*7] | |
186 | movdqa xmm8, xmm6 | |
187 | movdqa xmm13, xmm7 | |
188 | pclmulqdq xmm6, xmm10, 0x10 | |
189 | pclmulqdq xmm8, xmm10 , 0x1 | |
190 | pclmulqdq xmm7, xmm10, 0x10 | |
191 | pclmulqdq xmm13, xmm10 , 0x1 | |
192 | pxor xmm6, xmm9 | |
193 | xorps xmm6, xmm8 | |
194 | pxor xmm7, xmm12 | |
195 | xorps xmm7, xmm13 | |
196 | ||
197 | sub arg3, 128 | |
198 | ||
199 | ; check if there is another 128B in the buffer to be able to fold | |
200 | jge _fold_128_B_loop | |
201 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
202 | ||
203 | ||
204 | add arg2, 128 | |
205 | ; at this point, the buffer pointer is pointing at the last y Bytes of the buffer, where 0 <= y < 128 | |
206 | ; the 128B of folded data is in 8 of the xmm registers: xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7 | |
207 | ||
208 | ||
209 | ; fold the 8 xmm registers to 1 xmm register with different constants | |
210 | ||
211 | movdqa xmm10, [rk9] | |
212 | movdqa xmm8, xmm0 | |
213 | pclmulqdq xmm0, xmm10, 0x1 | |
214 | pclmulqdq xmm8, xmm10, 0x10 | |
215 | pxor xmm7, xmm8 | |
216 | xorps xmm7, xmm0 | |
217 | ||
218 | movdqa xmm10, [rk11] | |
219 | movdqa xmm8, xmm1 | |
220 | pclmulqdq xmm1, xmm10, 0x1 | |
221 | pclmulqdq xmm8, xmm10, 0x10 | |
222 | pxor xmm7, xmm8 | |
223 | xorps xmm7, xmm1 | |
224 | ||
225 | movdqa xmm10, [rk13] | |
226 | movdqa xmm8, xmm2 | |
227 | pclmulqdq xmm2, xmm10, 0x1 | |
228 | pclmulqdq xmm8, xmm10, 0x10 | |
229 | pxor xmm7, xmm8 | |
230 | pxor xmm7, xmm2 | |
231 | ||
232 | movdqa xmm10, [rk15] | |
233 | movdqa xmm8, xmm3 | |
234 | pclmulqdq xmm3, xmm10, 0x1 | |
235 | pclmulqdq xmm8, xmm10, 0x10 | |
236 | pxor xmm7, xmm8 | |
237 | xorps xmm7, xmm3 | |
238 | ||
239 | movdqa xmm10, [rk17] | |
240 | movdqa xmm8, xmm4 | |
241 | pclmulqdq xmm4, xmm10, 0x1 | |
242 | pclmulqdq xmm8, xmm10, 0x10 | |
243 | pxor xmm7, xmm8 | |
244 | pxor xmm7, xmm4 | |
245 | ||
246 | movdqa xmm10, [rk19] | |
247 | movdqa xmm8, xmm5 | |
248 | pclmulqdq xmm5, xmm10, 0x1 | |
249 | pclmulqdq xmm8, xmm10, 0x10 | |
250 | pxor xmm7, xmm8 | |
251 | xorps xmm7, xmm5 | |
252 | ||
253 | movdqa xmm10, [rk1] | |
254 | movdqa xmm8, xmm6 | |
255 | pclmulqdq xmm6, xmm10, 0x1 | |
256 | pclmulqdq xmm8, xmm10, 0x10 | |
257 | pxor xmm7, xmm8 | |
258 | pxor xmm7, xmm6 | |
259 | ||
260 | ||
261 | ; instead of 128, we add 128-16 to the loop counter to save 1 instruction from the loop | |
262 | ; instead of a cmp instruction, we use the negative flag with the jl instruction | |
263 | add arg3, 128-16 | |
264 | jl _final_reduction_for_128 | |
265 | ||
266 | ; now we have 16+y bytes left to reduce. 16 Bytes is in register xmm7 and the rest is in memory | |
267 | ; we can fold 16 bytes at a time if y>=16 | |
268 | ; continue folding 16B at a time | |
269 | ||
270 | _16B_reduction_loop: | |
271 | movdqa xmm8, xmm7 | |
272 | pclmulqdq xmm7, xmm10, 0x1 | |
273 | pclmulqdq xmm8, xmm10, 0x10 | |
274 | pxor xmm7, xmm8 | |
275 | movdqu xmm0, [arg2] | |
276 | pxor xmm7, xmm0 | |
277 | add arg2, 16 | |
278 | sub arg3, 16 | |
279 | ; instead of a cmp instruction, we utilize the flags with the jge instruction | |
280 | ; equivalent of: cmp arg3, 16-16 | |
281 | ; check if there is any more 16B in the buffer to be able to fold | |
282 | jge _16B_reduction_loop | |
283 | ||
284 | ;now we have 16+z bytes left to reduce, where 0<= z < 16. | |
285 | ;first, we reduce the data in the xmm7 register | |
286 | ||
287 | ||
288 | _final_reduction_for_128: | |
289 | add arg3, 16 | |
290 | je _128_done | |
291 | ||
292 | ; here we are getting data that is less than 16 bytes. | |
293 | ; since we know that there was data before the pointer, we can offset the input pointer before the actual point, to receive exactly 16 bytes. | |
294 | ; after that the registers need to be adjusted. | |
295 | _get_last_two_xmms: | |
296 | ||
297 | ||
298 | movdqa xmm2, xmm7 | |
299 | movdqu xmm1, [arg2 - 16 + arg3] | |
300 | ||
301 | ; get rid of the extra data that was loaded before | |
302 | ; load the shift constant | |
303 | lea rax, [pshufb_shf_table] | |
304 | add rax, arg3 | |
305 | movdqu xmm0, [rax] | |
306 | ||
307 | ||
308 | pshufb xmm7, xmm0 | |
309 | pxor xmm0, [mask3] | |
310 | pshufb xmm2, xmm0 | |
311 | ||
312 | pblendvb xmm2, xmm1 ;xmm0 is implicit | |
313 | ;;;;;;;;;; | |
314 | movdqa xmm8, xmm7 | |
315 | pclmulqdq xmm7, xmm10, 0x1 | |
316 | ||
317 | pclmulqdq xmm8, xmm10, 0x10 | |
318 | pxor xmm7, xmm8 | |
319 | pxor xmm7, xmm2 | |
320 | ||
321 | _128_done: | |
322 | ; compute crc of a 128-bit value | |
323 | movdqa xmm10, [rk5] | |
324 | movdqa xmm0, xmm7 | |
325 | ||
326 | ;64b fold | |
327 | pclmulqdq xmm7, xmm10, 0 | |
328 | psrldq xmm0, 8 | |
329 | pxor xmm7, xmm0 | |
330 | ||
331 | ;32b fold | |
332 | movdqa xmm0, xmm7 | |
333 | pslldq xmm7, 4 | |
334 | pclmulqdq xmm7, xmm10, 0x10 | |
335 | ||
336 | pxor xmm7, xmm0 | |
337 | ||
338 | ||
339 | ;barrett reduction | |
340 | _barrett: | |
341 | pand xmm7, [mask2] | |
342 | movdqa xmm1, xmm7 | |
343 | movdqa xmm2, xmm7 | |
344 | movdqa xmm10, [rk7] | |
345 | ||
346 | pclmulqdq xmm7, xmm10, 0 | |
347 | pxor xmm7, xmm2 | |
348 | pand xmm7, [mask] | |
349 | movdqa xmm2, xmm7 | |
350 | pclmulqdq xmm7, xmm10, 0x10 | |
351 | pxor xmm7, xmm2 | |
352 | pxor xmm7, xmm1 | |
353 | pextrd eax, xmm7, 2 | |
354 | ||
355 | _cleanup: | |
356 | ; return c ^ 0xffffffffL; | |
357 | not eax | |
358 | ||
359 | ||
360 | %ifidn __OUTPUT_FORMAT__, win64 | |
361 | movdqa xmm6, [rsp + XMM_SAVE + 16*0] | |
362 | movdqa xmm7, [rsp + XMM_SAVE + 16*1] | |
363 | movdqa xmm8, [rsp + XMM_SAVE + 16*2] | |
364 | movdqa xmm9, [rsp + XMM_SAVE + 16*3] | |
365 | movdqa xmm10, [rsp + XMM_SAVE + 16*4] | |
366 | movdqa xmm11, [rsp + XMM_SAVE + 16*5] | |
367 | movdqa xmm12, [rsp + XMM_SAVE + 16*6] | |
368 | movdqa xmm13, [rsp + XMM_SAVE + 16*7] | |
369 | %endif | |
370 | add rsp, VARIABLE_OFFSET | |
371 | ret | |
372 | ||
373 | ||
374 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
375 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
376 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
377 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
378 | ||
379 | align 16 | |
380 | _less_than_256: | |
381 | ||
382 | ; check if there is enough buffer to be able to fold 16B at a time | |
383 | cmp arg3, 32 | |
384 | jl _less_than_32 | |
385 | ||
386 | ; if there is, load the constants | |
387 | movdqa xmm10, [rk1] ; rk1 and rk2 in xmm10 | |
388 | ||
389 | movd xmm0, arg1_low32 ; get the initial crc value | |
390 | movdqu xmm7, [arg2] ; load the plaintext | |
391 | pxor xmm7, xmm0 | |
392 | ||
393 | ; update the buffer pointer | |
394 | add arg2, 16 | |
395 | ||
396 | ; update the counter. subtract 32 instead of 16 to save one instruction from the loop | |
397 | sub arg3, 32 | |
398 | ||
399 | jmp _16B_reduction_loop | |
400 | ||
401 | ||
402 | align 16 | |
403 | _less_than_32: | |
404 | ; mov initial crc to the return value. this is necessary for zero-length buffers. | |
405 | mov eax, arg1_low32 | |
406 | test arg3, arg3 | |
407 | je _cleanup | |
408 | ||
409 | movd xmm0, arg1_low32 ; get the initial crc value | |
410 | ||
411 | cmp arg3, 16 | |
412 | je _exact_16_left | |
413 | jl _less_than_16_left | |
414 | ||
415 | movdqu xmm7, [arg2] ; load the plaintext | |
416 | pxor xmm7, xmm0 ; xor the initial crc value | |
417 | add arg2, 16 | |
418 | sub arg3, 16 | |
419 | movdqa xmm10, [rk1] ; rk1 and rk2 in xmm10 | |
420 | jmp _get_last_two_xmms | |
421 | ||
422 | ||
423 | align 16 | |
424 | _less_than_16_left: | |
425 | ; use stack space to load data less than 16 bytes, zero-out the 16B in memory first. | |
426 | ||
427 | pxor xmm1, xmm1 | |
428 | mov r11, rsp | |
429 | movdqa [r11], xmm1 | |
430 | ||
431 | cmp arg3, 4 | |
432 | jl _only_less_than_4 | |
433 | ||
434 | ; backup the counter value | |
435 | mov r9, arg3 | |
436 | cmp arg3, 8 | |
437 | jl _less_than_8_left | |
438 | ||
439 | ; load 8 Bytes | |
440 | mov rax, [arg2] | |
441 | mov [r11], rax | |
442 | add r11, 8 | |
443 | sub arg3, 8 | |
444 | add arg2, 8 | |
445 | _less_than_8_left: | |
446 | ||
447 | cmp arg3, 4 | |
448 | jl _less_than_4_left | |
449 | ||
450 | ; load 4 Bytes | |
451 | mov eax, [arg2] | |
452 | mov [r11], eax | |
453 | add r11, 4 | |
454 | sub arg3, 4 | |
455 | add arg2, 4 | |
456 | _less_than_4_left: | |
457 | ||
458 | cmp arg3, 2 | |
459 | jl _less_than_2_left | |
460 | ||
461 | ; load 2 Bytes | |
462 | mov ax, [arg2] | |
463 | mov [r11], ax | |
464 | add r11, 2 | |
465 | sub arg3, 2 | |
466 | add arg2, 2 | |
467 | _less_than_2_left: | |
468 | cmp arg3, 1 | |
469 | jl _zero_left | |
470 | ||
471 | ; load 1 Byte | |
472 | mov al, [arg2] | |
473 | mov [r11], al | |
474 | ||
475 | _zero_left: | |
476 | movdqa xmm7, [rsp] | |
477 | pxor xmm7, xmm0 ; xor the initial crc value | |
478 | ||
479 | lea rax,[pshufb_shf_table] | |
480 | movdqu xmm0, [rax + r9] | |
481 | pshufb xmm7,xmm0 | |
482 | ||
483 | ||
484 | ||
485 | jmp _128_done | |
486 | ||
487 | align 16 | |
488 | _exact_16_left: | |
489 | movdqu xmm7, [arg2] | |
490 | pxor xmm7, xmm0 ; xor the initial crc value | |
491 | ||
492 | jmp _128_done | |
493 | ||
494 | _only_less_than_4: | |
495 | cmp arg3, 3 | |
496 | jl _only_less_than_3 | |
497 | ||
498 | ; load 3 Bytes | |
499 | mov al, [arg2] | |
500 | mov [r11], al | |
501 | ||
502 | mov al, [arg2+1] | |
503 | mov [r11+1], al | |
504 | ||
505 | mov al, [arg2+2] | |
506 | mov [r11+2], al | |
507 | ||
508 | movdqa xmm7, [rsp] | |
509 | pxor xmm7, xmm0 ; xor the initial crc value | |
510 | ||
511 | pslldq xmm7, 5 | |
512 | ||
513 | jmp _barrett | |
514 | _only_less_than_3: | |
515 | cmp arg3, 2 | |
516 | jl _only_less_than_2 | |
517 | ||
518 | ; load 2 Bytes | |
519 | mov al, [arg2] | |
520 | mov [r11], al | |
521 | ||
522 | mov al, [arg2+1] | |
523 | mov [r11+1], al | |
524 | ||
525 | movdqa xmm7, [rsp] | |
526 | pxor xmm7, xmm0 ; xor the initial crc value | |
527 | ||
528 | pslldq xmm7, 6 | |
529 | ||
530 | jmp _barrett | |
531 | _only_less_than_2: | |
532 | ||
533 | ; load 1 Byte | |
534 | mov al, [arg2] | |
535 | mov [r11], al | |
536 | ||
537 | movdqa xmm7, [rsp] | |
538 | pxor xmm7, xmm0 ; xor the initial crc value | |
539 | ||
540 | pslldq xmm7, 7 | |
541 | ||
542 | jmp _barrett | |
543 | ||
544 | section .data | |
545 | ||
546 | ; precomputed constants | |
547 | align 16 | |
548 | rk1 : | |
549 | DQ 0x00000000ccaa009e | |
550 | rk2 : | |
551 | DQ 0x00000001751997d0 | |
552 | rk3 : | |
553 | DQ 0x000000014a7fe880 | |
554 | rk4 : | |
555 | DQ 0x00000001e88ef372 | |
556 | rk5 : | |
557 | DQ 0x00000000ccaa009e | |
558 | rk6 : | |
559 | DQ 0x0000000163cd6124 | |
560 | rk7 : | |
561 | DQ 0x00000001f7011640 | |
562 | rk8 : | |
563 | DQ 0x00000001db710640 | |
564 | rk9 : | |
565 | DQ 0x00000001d7cfc6ac | |
566 | rk10 : | |
567 | DQ 0x00000001ea89367e | |
568 | rk11 : | |
569 | DQ 0x000000018cb44e58 | |
570 | rk12 : | |
571 | DQ 0x00000000df068dc2 | |
572 | rk13 : | |
573 | DQ 0x00000000ae0b5394 | |
574 | rk14 : | |
575 | DQ 0x00000001c7569e54 | |
576 | rk15 : | |
577 | DQ 0x00000001c6e41596 | |
578 | rk16 : | |
579 | DQ 0x0000000154442bd4 | |
580 | rk17 : | |
581 | DQ 0x0000000174359406 | |
582 | rk18 : | |
583 | DQ 0x000000003db1ecdc | |
584 | rk19 : | |
585 | DQ 0x000000015a546366 | |
586 | rk20 : | |
587 | DQ 0x00000000f1da05aa | |
588 | ||
589 | ||
590 | pshufb_shf_table: | |
591 | ; use these values for shift constants for the pshufb instruction | |
592 | ; different alignments result in values as shown: | |
593 | ; dq 0x8887868584838281, 0x008f8e8d8c8b8a89 ; shl 15 (16-1) / shr1 | |
594 | ; dq 0x8988878685848382, 0x01008f8e8d8c8b8a ; shl 14 (16-3) / shr2 | |
595 | ; dq 0x8a89888786858483, 0x0201008f8e8d8c8b ; shl 13 (16-4) / shr3 | |
596 | ; dq 0x8b8a898887868584, 0x030201008f8e8d8c ; shl 12 (16-4) / shr4 | |
597 | ; dq 0x8c8b8a8988878685, 0x04030201008f8e8d ; shl 11 (16-5) / shr5 | |
598 | ; dq 0x8d8c8b8a89888786, 0x0504030201008f8e ; shl 10 (16-6) / shr6 | |
599 | ; dq 0x8e8d8c8b8a898887, 0x060504030201008f ; shl 9 (16-7) / shr7 | |
600 | ; dq 0x8f8e8d8c8b8a8988, 0x0706050403020100 ; shl 8 (16-8) / shr8 | |
601 | ; dq 0x008f8e8d8c8b8a89, 0x0807060504030201 ; shl 7 (16-9) / shr9 | |
602 | ; dq 0x01008f8e8d8c8b8a, 0x0908070605040302 ; shl 6 (16-10) / shr10 | |
603 | ; dq 0x0201008f8e8d8c8b, 0x0a09080706050403 ; shl 5 (16-11) / shr11 | |
604 | ; dq 0x030201008f8e8d8c, 0x0b0a090807060504 ; shl 4 (16-12) / shr12 | |
605 | ; dq 0x04030201008f8e8d, 0x0c0b0a0908070605 ; shl 3 (16-13) / shr13 | |
606 | ; dq 0x0504030201008f8e, 0x0d0c0b0a09080706 ; shl 2 (16-14) / shr14 | |
607 | ; dq 0x060504030201008f, 0x0e0d0c0b0a090807 ; shl 1 (16-15) / shr15 | |
608 | dq 0x8786858483828100, 0x8f8e8d8c8b8a8988 | |
609 | dq 0x0706050403020100, 0x000e0d0c0b0a0908 | |
610 | ||
611 | ||
612 | mask: | |
613 | dq 0xFFFFFFFFFFFFFFFF, 0x0000000000000000 | |
614 | mask2: | |
615 | dq 0xFFFFFFFF00000000, 0xFFFFFFFFFFFFFFFF | |
616 | mask3: | |
617 | dq 0x8080808080808080, 0x8080808080808080 |