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1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ; Copyright(c) 2011-2020 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_refl_by16_10( | |
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://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-generic-polynomials-pclmulqdq-paper.pdf | |
45 | ; | |
46 | ; | |
47 | ||
48 | %include "reg_sizes.asm" | |
49 | ||
50 | %ifndef FUNCTION_NAME | |
51 | %define FUNCTION_NAME crc32_ieee_by16_10 | |
52 | %endif | |
53 | ||
54 | %if (AS_FEATURE_LEVEL) >= 10 | |
55 | ||
56 | [bits 64] | |
57 | default rel | |
58 | ||
59 | section .text | |
60 | ||
61 | ||
62 | %ifidn __OUTPUT_FORMAT__, win64 | |
63 | %xdefine arg1 rcx | |
64 | %xdefine arg2 rdx | |
65 | %xdefine arg3 r8 | |
66 | ||
67 | %xdefine arg1_low32 ecx | |
68 | %else | |
69 | %xdefine arg1 rdi | |
70 | %xdefine arg2 rsi | |
71 | %xdefine arg3 rdx | |
72 | ||
73 | %xdefine arg1_low32 edi | |
74 | %endif | |
75 | ||
76 | %define TMP 16*0 | |
77 | %ifidn __OUTPUT_FORMAT__, win64 | |
78 | %define XMM_SAVE 16*2 | |
79 | %define VARIABLE_OFFSET 16*12+8 | |
80 | %else | |
81 | %define VARIABLE_OFFSET 16*2+8 | |
82 | %endif | |
83 | ||
84 | align 16 | |
20effc67 | 85 | mk_global FUNCTION_NAME, function |
f91f0fd5 | 86 | FUNCTION_NAME: |
20effc67 | 87 | endbranch |
f91f0fd5 TL |
88 | |
89 | not arg1_low32 | |
90 | sub rsp, VARIABLE_OFFSET | |
91 | ||
92 | %ifidn __OUTPUT_FORMAT__, win64 | |
93 | ; push the xmm registers into the stack to maintain | |
94 | vmovdqa [rsp + XMM_SAVE + 16*0], xmm6 | |
95 | vmovdqa [rsp + XMM_SAVE + 16*1], xmm7 | |
96 | vmovdqa [rsp + XMM_SAVE + 16*2], xmm8 | |
97 | vmovdqa [rsp + XMM_SAVE + 16*3], xmm9 | |
98 | vmovdqa [rsp + XMM_SAVE + 16*4], xmm10 | |
99 | vmovdqa [rsp + XMM_SAVE + 16*5], xmm11 | |
100 | vmovdqa [rsp + XMM_SAVE + 16*6], xmm12 | |
101 | vmovdqa [rsp + XMM_SAVE + 16*7], xmm13 | |
102 | vmovdqa [rsp + XMM_SAVE + 16*8], xmm14 | |
103 | vmovdqa [rsp + XMM_SAVE + 16*9], xmm15 | |
104 | %endif | |
105 | ||
106 | vbroadcasti32x4 zmm18, [SHUF_MASK] | |
107 | cmp arg3, 256 | |
108 | jl .less_than_256 | |
109 | ||
110 | ; load the initial crc value | |
111 | vmovd xmm10, arg1_low32 ; initial crc | |
112 | ||
113 | ; crc value does not need to be byte-reflected, but it needs to be moved to the high part of the register. | |
114 | ; because data will be byte-reflected and will align with initial crc at correct place. | |
115 | vpslldq xmm10, 12 | |
116 | ||
117 | ; receive the initial 64B data, xor the initial crc value | |
118 | vmovdqu8 zmm0, [arg2+16*0] | |
119 | vmovdqu8 zmm4, [arg2+16*4] | |
120 | vpshufb zmm0, zmm0, zmm18 | |
121 | vpshufb zmm4, zmm4, zmm18 | |
122 | vpxorq zmm0, zmm10 | |
123 | vbroadcasti32x4 zmm10, [rk3] ;xmm10 has rk3 and rk4 | |
124 | ;imm value of pclmulqdq instruction will determine which constant to use | |
125 | ||
126 | sub arg3, 256 | |
127 | cmp arg3, 256 | |
128 | jl .fold_128_B_loop | |
129 | ||
130 | vmovdqu8 zmm7, [arg2+16*8] | |
131 | vmovdqu8 zmm8, [arg2+16*12] | |
132 | vpshufb zmm7, zmm7, zmm18 | |
133 | vpshufb zmm8, zmm8, zmm18 | |
134 | vbroadcasti32x4 zmm16, [rk_1] ;zmm16 has rk-1 and rk-2 | |
135 | sub arg3, 256 | |
136 | ||
137 | .fold_256_B_loop: | |
138 | add arg2, 256 | |
139 | vmovdqu8 zmm3, [arg2+16*0] | |
140 | vpshufb zmm3, zmm3, zmm18 | |
141 | vpclmulqdq zmm1, zmm0, zmm16, 0x00 | |
142 | vpclmulqdq zmm2, zmm0, zmm16, 0x11 | |
143 | vpxorq zmm0, zmm1, zmm2 | |
144 | vpxorq zmm0, zmm0, zmm3 | |
145 | ||
146 | vmovdqu8 zmm9, [arg2+16*4] | |
147 | vpshufb zmm9, zmm9, zmm18 | |
148 | vpclmulqdq zmm5, zmm4, zmm16, 0x00 | |
149 | vpclmulqdq zmm6, zmm4, zmm16, 0x11 | |
150 | vpxorq zmm4, zmm5, zmm6 | |
151 | vpxorq zmm4, zmm4, zmm9 | |
152 | ||
153 | vmovdqu8 zmm11, [arg2+16*8] | |
154 | vpshufb zmm11, zmm11, zmm18 | |
155 | vpclmulqdq zmm12, zmm7, zmm16, 0x00 | |
156 | vpclmulqdq zmm13, zmm7, zmm16, 0x11 | |
157 | vpxorq zmm7, zmm12, zmm13 | |
158 | vpxorq zmm7, zmm7, zmm11 | |
159 | ||
160 | vmovdqu8 zmm17, [arg2+16*12] | |
161 | vpshufb zmm17, zmm17, zmm18 | |
162 | vpclmulqdq zmm14, zmm8, zmm16, 0x00 | |
163 | vpclmulqdq zmm15, zmm8, zmm16, 0x11 | |
164 | vpxorq zmm8, zmm14, zmm15 | |
165 | vpxorq zmm8, zmm8, zmm17 | |
166 | ||
167 | sub arg3, 256 | |
168 | jge .fold_256_B_loop | |
169 | ||
170 | ;; Fold 256 into 128 | |
171 | add arg2, 256 | |
172 | vpclmulqdq zmm1, zmm0, zmm10, 0x00 | |
173 | vpclmulqdq zmm2, zmm0, zmm10, 0x11 | |
174 | vpternlogq zmm7, zmm1, zmm2, 0x96 ; xor ABC | |
175 | ||
176 | vpclmulqdq zmm5, zmm4, zmm10, 0x00 | |
177 | vpclmulqdq zmm6, zmm4, zmm10, 0x11 | |
178 | vpternlogq zmm8, zmm5, zmm6, 0x96 ; xor ABC | |
179 | ||
180 | vmovdqa32 zmm0, zmm7 | |
181 | vmovdqa32 zmm4, zmm8 | |
182 | ||
183 | add arg3, 128 | |
184 | jmp .fold_128_B_register | |
185 | ||
186 | ||
187 | ||
188 | ; at this section of the code, there is 128*x+y (0<=y<128) bytes of buffer. The fold_128_B_loop | |
189 | ; loop will fold 128B at a time until we have 128+y Bytes of buffer | |
190 | ||
191 | ; fold 128B at a time. This section of the code folds 8 xmm registers in parallel | |
192 | .fold_128_B_loop: | |
193 | add arg2, 128 | |
194 | vmovdqu8 zmm8, [arg2+16*0] | |
195 | vpshufb zmm8, zmm8, zmm18 | |
196 | vpclmulqdq zmm2, zmm0, zmm10, 0x00 | |
197 | vpclmulqdq zmm1, zmm0, zmm10, 0x11 | |
198 | vpxorq zmm0, zmm2, zmm1 | |
199 | vpxorq zmm0, zmm0, zmm8 | |
200 | ||
201 | vmovdqu8 zmm9, [arg2+16*4] | |
202 | vpshufb zmm9, zmm9, zmm18 | |
203 | vpclmulqdq zmm5, zmm4, zmm10, 0x00 | |
204 | vpclmulqdq zmm6, zmm4, zmm10, 0x11 | |
205 | vpxorq zmm4, zmm5, zmm6 | |
206 | vpxorq zmm4, zmm4, zmm9 | |
207 | ||
208 | sub arg3, 128 | |
209 | jge .fold_128_B_loop | |
210 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
211 | ||
212 | add arg2, 128 | |
213 | ; at this point, the buffer pointer is pointing at the last y Bytes of the buffer, where 0 <= y < 128 | |
214 | ; the 128B of folded data is in 8 of the xmm registers: xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7 | |
215 | ||
216 | .fold_128_B_register: | |
217 | ; fold the 8 128b parts into 1 xmm register with different constants | |
218 | vmovdqu8 zmm16, [rk9] ; multiply by rk9-rk16 | |
219 | vmovdqu8 zmm11, [rk17] ; multiply by rk17-rk20, rk1,rk2, 0,0 | |
220 | vpclmulqdq zmm1, zmm0, zmm16, 0x00 | |
221 | vpclmulqdq zmm2, zmm0, zmm16, 0x11 | |
222 | vextracti64x2 xmm7, zmm4, 3 ; save last that has no multiplicand | |
223 | ||
224 | vpclmulqdq zmm5, zmm4, zmm11, 0x00 | |
225 | vpclmulqdq zmm6, zmm4, zmm11, 0x11 | |
226 | vmovdqa xmm10, [rk1] ; Needed later in reduction loop | |
227 | vpternlogq zmm1, zmm2, zmm5, 0x96 ; xor ABC | |
228 | vpternlogq zmm1, zmm6, zmm7, 0x96 ; xor ABC | |
229 | ||
230 | vshufi64x2 zmm8, zmm1, zmm1, 0x4e ; Swap 1,0,3,2 - 01 00 11 10 | |
231 | vpxorq ymm8, ymm8, ymm1 | |
232 | vextracti64x2 xmm5, ymm8, 1 | |
233 | vpxorq xmm7, xmm5, xmm8 | |
234 | ||
235 | ; instead of 128, we add 128-16 to the loop counter to save 1 instruction from the loop | |
236 | ; instead of a cmp instruction, we use the negative flag with the jl instruction | |
237 | add arg3, 128-16 | |
238 | jl .final_reduction_for_128 | |
239 | ||
240 | ; now we have 16+y bytes left to reduce. 16 Bytes is in register xmm7 and the rest is in memory | |
241 | ; we can fold 16 bytes at a time if y>=16 | |
242 | ; continue folding 16B at a time | |
243 | ||
244 | .16B_reduction_loop: | |
245 | vpclmulqdq xmm8, xmm7, xmm10, 0x11 | |
246 | vpclmulqdq xmm7, xmm7, xmm10, 0x00 | |
247 | vpxor xmm7, xmm8 | |
248 | vmovdqu xmm0, [arg2] | |
249 | vpshufb xmm0, xmm0, xmm18 | |
250 | vpxor xmm7, xmm0 | |
251 | add arg2, 16 | |
252 | sub arg3, 16 | |
253 | ; instead of a cmp instruction, we utilize the flags with the jge instruction | |
254 | ; equivalent of: cmp arg3, 16-16 | |
255 | ; check if there is any more 16B in the buffer to be able to fold | |
256 | jge .16B_reduction_loop | |
257 | ||
258 | ;now we have 16+z bytes left to reduce, where 0<= z < 16. | |
259 | ;first, we reduce the data in the xmm7 register | |
260 | ||
261 | ||
262 | .final_reduction_for_128: | |
263 | add arg3, 16 | |
264 | je .128_done | |
265 | ||
266 | ; here we are getting data that is less than 16 bytes. | |
267 | ; since we know that there was data before the pointer, we can offset | |
268 | ; the input pointer before the actual point, to receive exactly 16 bytes. | |
269 | ; after that the registers need to be adjusted. | |
270 | .get_last_two_xmms: | |
271 | ||
272 | vmovdqa xmm2, xmm7 | |
273 | vmovdqu xmm1, [arg2 - 16 + arg3] | |
274 | vpshufb xmm1, xmm18 | |
275 | ||
276 | ; get rid of the extra data that was loaded before | |
277 | ; load the shift constant | |
278 | lea rax, [pshufb_shf_table + 16] | |
279 | sub rax, arg3 | |
280 | vmovdqu xmm0, [rax] | |
281 | ||
282 | vpshufb xmm2, xmm0 | |
283 | vpxor xmm0, [mask1] | |
284 | vpshufb xmm7, xmm0 | |
285 | vpblendvb xmm1, xmm1, xmm2, xmm0 | |
286 | ||
287 | vpclmulqdq xmm8, xmm7, xmm10, 0x11 | |
288 | vpclmulqdq xmm7, xmm7, xmm10, 0x00 | |
289 | vpxor xmm7, xmm8 | |
290 | vpxor xmm7, xmm1 | |
291 | ||
292 | .128_done: | |
293 | ; compute crc of a 128-bit value | |
294 | vmovdqa xmm10, [rk5] | |
295 | vmovdqa xmm0, xmm7 | |
296 | ||
297 | ;64b fold | |
298 | vpclmulqdq xmm7, xmm10, 0x01 ; H*L | |
299 | vpslldq xmm0, 8 | |
300 | vpxor xmm7, xmm0 | |
301 | ||
302 | ;32b fold | |
303 | vmovdqa xmm0, xmm7 | |
304 | vpand xmm0, [mask2] | |
305 | vpsrldq xmm7, 12 | |
306 | vpclmulqdq xmm7, xmm10, 0x10 | |
307 | vpxor xmm7, xmm0 | |
308 | ||
309 | ;barrett reduction | |
310 | .barrett: | |
311 | vmovdqa xmm10, [rk7] ; rk7 and rk8 in xmm10 | |
312 | vmovdqa xmm0, xmm7 | |
313 | vpclmulqdq xmm7, xmm10, 0x01 | |
314 | vpslldq xmm7, 4 | |
315 | vpclmulqdq xmm7, xmm10, 0x11 | |
316 | ||
317 | vpslldq xmm7, 4 | |
318 | vpxor xmm7, xmm0 | |
319 | vpextrd eax, xmm7, 1 | |
320 | ||
321 | .cleanup: | |
322 | not eax | |
323 | ||
324 | ||
325 | %ifidn __OUTPUT_FORMAT__, win64 | |
326 | vmovdqa xmm6, [rsp + XMM_SAVE + 16*0] | |
327 | vmovdqa xmm7, [rsp + XMM_SAVE + 16*1] | |
328 | vmovdqa xmm8, [rsp + XMM_SAVE + 16*2] | |
329 | vmovdqa xmm9, [rsp + XMM_SAVE + 16*3] | |
330 | vmovdqa xmm10, [rsp + XMM_SAVE + 16*4] | |
331 | vmovdqa xmm11, [rsp + XMM_SAVE + 16*5] | |
332 | vmovdqa xmm12, [rsp + XMM_SAVE + 16*6] | |
333 | vmovdqa xmm13, [rsp + XMM_SAVE + 16*7] | |
334 | vmovdqa xmm14, [rsp + XMM_SAVE + 16*8] | |
335 | vmovdqa xmm15, [rsp + XMM_SAVE + 16*9] | |
336 | %endif | |
337 | add rsp, VARIABLE_OFFSET | |
338 | ret | |
339 | ||
340 | ||
341 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
342 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
343 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
344 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
345 | ||
346 | align 16 | |
347 | .less_than_256: | |
348 | ||
349 | ; check if there is enough buffer to be able to fold 16B at a time | |
350 | cmp arg3, 32 | |
351 | jl .less_than_32 | |
352 | ||
353 | ; if there is, load the constants | |
354 | vmovdqa xmm10, [rk1] ; rk1 and rk2 in xmm10 | |
355 | ||
356 | vmovd xmm0, arg1_low32 ; get the initial crc value | |
357 | vpslldq xmm0, 12 ; align it to its correct place | |
358 | vmovdqu xmm7, [arg2] ; load the plaintext | |
359 | vpshufb xmm7, xmm18 ; byte-reflect the plaintext | |
360 | vpxor xmm7, xmm0 | |
361 | ||
362 | ; update the buffer pointer | |
363 | add arg2, 16 | |
364 | ||
365 | ; update the counter. subtract 32 instead of 16 to save one instruction from the loop | |
366 | sub arg3, 32 | |
367 | ||
368 | jmp .16B_reduction_loop | |
369 | ||
370 | ||
371 | align 16 | |
372 | .less_than_32: | |
373 | ; mov initial crc to the return value. this is necessary for zero-length buffers. | |
374 | mov eax, arg1_low32 | |
375 | test arg3, arg3 | |
376 | je .cleanup | |
377 | ||
378 | vmovd xmm0, arg1_low32 ; get the initial crc value | |
379 | vpslldq xmm0, 12 ; align it to its correct place | |
380 | ||
381 | cmp arg3, 16 | |
382 | je .exact_16_left | |
383 | jl .less_than_16_left | |
384 | ||
385 | vmovdqu xmm7, [arg2] ; load the plaintext | |
386 | vpshufb xmm7, xmm18 | |
387 | vpxor xmm7, xmm0 ; xor the initial crc value | |
388 | add arg2, 16 | |
389 | sub arg3, 16 | |
390 | vmovdqa xmm10, [rk1] ; rk1 and rk2 in xmm10 | |
391 | jmp .get_last_two_xmms | |
392 | ||
393 | align 16 | |
394 | .less_than_16_left: | |
395 | ; use stack space to load data less than 16 bytes, zero-out the 16B in memory first. | |
396 | ||
397 | vpxor xmm1, xmm1 | |
398 | mov r11, rsp | |
399 | vmovdqa [r11], xmm1 | |
400 | ||
401 | cmp arg3, 4 | |
402 | jl .only_less_than_4 | |
403 | ||
404 | ; backup the counter value | |
405 | mov r9, arg3 | |
406 | cmp arg3, 8 | |
407 | jl .less_than_8_left | |
408 | ||
409 | ; load 8 Bytes | |
410 | mov rax, [arg2] | |
411 | mov [r11], rax | |
412 | add r11, 8 | |
413 | sub arg3, 8 | |
414 | add arg2, 8 | |
415 | .less_than_8_left: | |
416 | ||
417 | cmp arg3, 4 | |
418 | jl .less_than_4_left | |
419 | ||
420 | ; load 4 Bytes | |
421 | mov eax, [arg2] | |
422 | mov [r11], eax | |
423 | add r11, 4 | |
424 | sub arg3, 4 | |
425 | add arg2, 4 | |
426 | .less_than_4_left: | |
427 | ||
428 | cmp arg3, 2 | |
429 | jl .less_than_2_left | |
430 | ||
431 | ; load 2 Bytes | |
432 | mov ax, [arg2] | |
433 | mov [r11], ax | |
434 | add r11, 2 | |
435 | sub arg3, 2 | |
436 | add arg2, 2 | |
437 | .less_than_2_left: | |
438 | cmp arg3, 1 | |
439 | jl .zero_left | |
440 | ||
441 | ; load 1 Byte | |
442 | mov al, [arg2] | |
443 | mov [r11], al | |
444 | ||
445 | .zero_left: | |
446 | vmovdqa xmm7, [rsp] | |
447 | vpshufb xmm7, xmm18 | |
448 | vpxor xmm7, xmm0 ; xor the initial crc value | |
449 | ||
450 | lea rax, [pshufb_shf_table + 16] | |
451 | sub rax, r9 | |
452 | vmovdqu xmm0, [rax] | |
453 | vpxor xmm0, [mask1] | |
454 | ||
455 | vpshufb xmm7,xmm0 | |
456 | jmp .128_done | |
457 | ||
458 | align 16 | |
459 | .exact_16_left: | |
460 | vmovdqu xmm7, [arg2] | |
461 | vpshufb xmm7, xmm18 | |
462 | vpxor xmm7, xmm0 ; xor the initial crc value | |
463 | jmp .128_done | |
464 | ||
465 | .only_less_than_4: | |
466 | cmp arg3, 3 | |
467 | jl .only_less_than_3 | |
468 | ||
469 | ; load 3 Bytes | |
470 | mov al, [arg2] | |
471 | mov [r11], al | |
472 | ||
473 | mov al, [arg2+1] | |
474 | mov [r11+1], al | |
475 | ||
476 | mov al, [arg2+2] | |
477 | mov [r11+2], al | |
478 | ||
479 | vmovdqa xmm7, [rsp] | |
480 | vpshufb xmm7, xmm18 | |
481 | vpxor xmm7, xmm0 ; xor the initial crc value | |
482 | ||
483 | vpsrldq xmm7, 5 | |
484 | jmp .barrett | |
485 | ||
486 | .only_less_than_3: | |
487 | cmp arg3, 2 | |
488 | jl .only_less_than_2 | |
489 | ||
490 | ; load 2 Bytes | |
491 | mov al, [arg2] | |
492 | mov [r11], al | |
493 | ||
494 | mov al, [arg2+1] | |
495 | mov [r11+1], al | |
496 | ||
497 | vmovdqa xmm7, [rsp] | |
498 | vpshufb xmm7, xmm18 | |
499 | vpxor xmm7, xmm0 ; xor the initial crc value | |
500 | ||
501 | vpsrldq xmm7, 6 | |
502 | jmp .barrett | |
503 | ||
504 | .only_less_than_2: | |
505 | ; load 1 Byte | |
506 | mov al, [arg2] | |
507 | mov [r11], al | |
508 | ||
509 | vmovdqa xmm7, [rsp] | |
510 | vpshufb xmm7, xmm18 | |
511 | vpxor xmm7, xmm0 ; xor the initial crc value | |
512 | ||
513 | vpsrldq xmm7, 7 | |
514 | jmp .barrett | |
515 | ||
516 | section .data | |
517 | align 32 | |
518 | ||
519 | %ifndef USE_CONSTS | |
520 | ; precomputed constants | |
521 | rk_1: dq 0x1851689900000000 | |
522 | rk_2: dq 0xa3dc855100000000 | |
523 | rk1: dq 0xf200aa6600000000 | |
524 | rk2: dq 0x17d3315d00000000 | |
525 | rk3: dq 0x022ffca500000000 | |
526 | rk4: dq 0x9d9ee22f00000000 | |
527 | rk5: dq 0xf200aa6600000000 | |
528 | rk6: dq 0x490d678d00000000 | |
529 | rk7: dq 0x0000000104d101df | |
530 | rk8: dq 0x0000000104c11db7 | |
531 | rk9: dq 0x6ac7e7d700000000 | |
532 | rk10: dq 0xfcd922af00000000 | |
533 | rk11: dq 0x34e45a6300000000 | |
534 | rk12: dq 0x8762c1f600000000 | |
535 | rk13: dq 0x5395a0ea00000000 | |
536 | rk14: dq 0x54f2d5c700000000 | |
537 | rk15: dq 0xd3504ec700000000 | |
538 | rk16: dq 0x57a8445500000000 | |
539 | rk17: dq 0xc053585d00000000 | |
540 | rk18: dq 0x766f1b7800000000 | |
541 | rk19: dq 0xcd8c54b500000000 | |
542 | rk20: dq 0xab40b71e00000000 | |
543 | ||
544 | rk_1b: dq 0xf200aa6600000000 | |
545 | rk_2b: dq 0x17d3315d00000000 | |
546 | dq 0x0000000000000000 | |
547 | dq 0x0000000000000000 | |
548 | %else | |
549 | INCLUDE_CONSTS | |
550 | %endif | |
551 | ||
552 | mask1: dq 0x8080808080808080, 0x8080808080808080 | |
553 | mask2: dq 0xFFFFFFFFFFFFFFFF, 0x00000000FFFFFFFF | |
554 | ||
555 | SHUF_MASK: dq 0x08090A0B0C0D0E0F, 0x0001020304050607 | |
556 | ||
557 | pshufb_shf_table: | |
558 | ; use these values for shift constants for the pshufb instruction | |
559 | ; different alignments result in values as shown: | |
560 | ; dq 0x8887868584838281, 0x008f8e8d8c8b8a89 ; shl 15 (16-1) / shr1 | |
561 | ; dq 0x8988878685848382, 0x01008f8e8d8c8b8a ; shl 14 (16-3) / shr2 | |
562 | ; dq 0x8a89888786858483, 0x0201008f8e8d8c8b ; shl 13 (16-4) / shr3 | |
563 | ; dq 0x8b8a898887868584, 0x030201008f8e8d8c ; shl 12 (16-4) / shr4 | |
564 | ; dq 0x8c8b8a8988878685, 0x04030201008f8e8d ; shl 11 (16-5) / shr5 | |
565 | ; dq 0x8d8c8b8a89888786, 0x0504030201008f8e ; shl 10 (16-6) / shr6 | |
566 | ; dq 0x8e8d8c8b8a898887, 0x060504030201008f ; shl 9 (16-7) / shr7 | |
567 | ; dq 0x8f8e8d8c8b8a8988, 0x0706050403020100 ; shl 8 (16-8) / shr8 | |
568 | ; dq 0x008f8e8d8c8b8a89, 0x0807060504030201 ; shl 7 (16-9) / shr9 | |
569 | ; dq 0x01008f8e8d8c8b8a, 0x0908070605040302 ; shl 6 (16-10) / shr10 | |
570 | ; dq 0x0201008f8e8d8c8b, 0x0a09080706050403 ; shl 5 (16-11) / shr11 | |
571 | ; dq 0x030201008f8e8d8c, 0x0b0a090807060504 ; shl 4 (16-12) / shr12 | |
572 | ; dq 0x04030201008f8e8d, 0x0c0b0a0908070605 ; shl 3 (16-13) / shr13 | |
573 | ; dq 0x0504030201008f8e, 0x0d0c0b0a09080706 ; shl 2 (16-14) / shr14 | |
574 | ; dq 0x060504030201008f, 0x0e0d0c0b0a090807 ; shl 1 (16-15) / shr15 | |
575 | dq 0x8786858483828100, 0x8f8e8d8c8b8a8988 | |
576 | dq 0x0706050403020100, 0x000e0d0c0b0a0908 | |
577 | dq 0x8080808080808080, 0x0f0e0d0c0b0a0908 | |
578 | dq 0x8080808080808080, 0x8080808080808080 | |
579 | ||
580 | %else ; Assembler doesn't understand these opcodes. Add empty symbol for windows. | |
581 | %ifidn __OUTPUT_FORMAT__, win64 | |
582 | global no_ %+ FUNCTION_NAME | |
583 | no_ %+ FUNCTION_NAME %+ : | |
584 | %endif | |
585 | %endif ; (AS_FEATURE_LEVEL) >= 10 |