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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_by8_02( | |
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_refl_by8 | |
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 | %define fetch_dist 1024 | |
59 | ||
60 | [bits 64] | |
61 | default rel | |
62 | ||
63 | section .text | |
64 | ||
65 | ||
66 | %ifidn __OUTPUT_FORMAT__, win64 | |
67 | %xdefine arg1 rcx | |
68 | %xdefine arg2 rdx | |
69 | %xdefine arg3 r8 | |
70 | ||
71 | %xdefine arg1_low32 ecx | |
72 | %else | |
73 | %xdefine arg1 rdi | |
74 | %xdefine arg2 rsi | |
75 | %xdefine arg3 rdx | |
76 | ||
77 | %xdefine arg1_low32 edi | |
78 | %endif | |
79 | ||
80 | %define TMP 16*0 | |
81 | %ifidn __OUTPUT_FORMAT__, win64 | |
82 | %define XMM_SAVE 16*2 | |
83 | %define VARIABLE_OFFSET 16*10+8 | |
84 | %else | |
85 | %define VARIABLE_OFFSET 16*2+8 | |
86 | %endif | |
87 | ||
88 | align 16 | |
20effc67 | 89 | mk_global crc32_gzip_refl_by8_02, function |
f91f0fd5 | 90 | crc32_gzip_refl_by8_02: |
20effc67 | 91 | endbranch |
f91f0fd5 TL |
92 | not arg1_low32 |
93 | sub rsp, VARIABLE_OFFSET | |
94 | ||
95 | %ifidn __OUTPUT_FORMAT__, win64 | |
96 | ; push the xmm registers into the stack to maintain | |
97 | vmovdqa [rsp + XMM_SAVE + 16*0], xmm6 | |
98 | vmovdqa [rsp + XMM_SAVE + 16*1], xmm7 | |
99 | vmovdqa [rsp + XMM_SAVE + 16*2], xmm8 | |
100 | vmovdqa [rsp + XMM_SAVE + 16*3], xmm9 | |
101 | vmovdqa [rsp + XMM_SAVE + 16*4], xmm10 | |
102 | vmovdqa [rsp + XMM_SAVE + 16*5], xmm11 | |
103 | vmovdqa [rsp + XMM_SAVE + 16*6], xmm12 | |
104 | vmovdqa [rsp + XMM_SAVE + 16*7], xmm13 | |
105 | %endif | |
106 | ||
107 | ; check if smaller than 256B | |
108 | cmp arg3, 256 | |
109 | jl .less_than_256 | |
110 | ||
111 | ; load the initial crc value | |
112 | vmovd xmm10, arg1_low32 ; initial crc | |
113 | ||
114 | ; receive the initial 64B data, xor the initial crc value | |
115 | vmovdqu xmm0, [arg2+16*0] | |
116 | vmovdqu xmm1, [arg2+16*1] | |
117 | vmovdqu xmm2, [arg2+16*2] | |
118 | vmovdqu xmm3, [arg2+16*3] | |
119 | vmovdqu xmm4, [arg2+16*4] | |
120 | vmovdqu xmm5, [arg2+16*5] | |
121 | vmovdqu xmm6, [arg2+16*6] | |
122 | vmovdqu xmm7, [arg2+16*7] | |
123 | ||
124 | ; XOR the initial_crc value | |
125 | vpxor xmm0, xmm10 | |
126 | vmovdqa xmm10, [rk3] ;xmm10 has rk3 and rk4 | |
127 | ;imm value of pclmulqdq instruction will determine which constant to use | |
128 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
129 | ; we subtract 256 instead of 128 to save one instruction from the loop | |
130 | sub arg3, 256 | |
131 | ||
132 | ; at this section of the code, there is 128*x+y (0<=y<128) bytes of buffer. The fold_128_B_loop | |
133 | ; loop will fold 128B at a time until we have 128+y Bytes of buffer | |
134 | ||
135 | ; fold 128B at a time. This section of the code folds 8 xmm registers in parallel | |
136 | .fold_128_B_loop: | |
137 | add arg2, 128 | |
138 | prefetchnta [arg2+fetch_dist+0] | |
139 | vmovdqu xmm9, [arg2+16*0] | |
140 | vmovdqu xmm12, [arg2+16*1] | |
141 | vpclmulqdq xmm8, xmm0, xmm10, 0x10 | |
142 | vpclmulqdq xmm0, xmm0, xmm10 , 0x1 | |
143 | vpclmulqdq xmm13, xmm1, xmm10, 0x10 | |
144 | vpclmulqdq xmm1, xmm1, xmm10 , 0x1 | |
145 | vpxor xmm0, xmm9 | |
146 | vxorps xmm0, xmm8 | |
147 | vpxor xmm1, xmm12 | |
148 | vxorps xmm1, xmm13 | |
149 | ||
150 | prefetchnta [arg2+fetch_dist+32] | |
151 | vmovdqu xmm9, [arg2+16*2] | |
152 | vmovdqu xmm12, [arg2+16*3] | |
153 | vpclmulqdq xmm8, xmm2, xmm10, 0x10 | |
154 | vpclmulqdq xmm2, xmm2, xmm10 , 0x1 | |
155 | vpclmulqdq xmm13, xmm3, xmm10, 0x10 | |
156 | vpclmulqdq xmm3, xmm3, xmm10 , 0x1 | |
157 | vpxor xmm2, xmm9 | |
158 | vxorps xmm2, xmm8 | |
159 | vpxor xmm3, xmm12 | |
160 | vxorps xmm3, xmm13 | |
161 | ||
162 | prefetchnta [arg2+fetch_dist+64] | |
163 | vmovdqu xmm9, [arg2+16*4] | |
164 | vmovdqu xmm12, [arg2+16*5] | |
165 | vpclmulqdq xmm8, xmm4, xmm10, 0x10 | |
166 | vpclmulqdq xmm4, xmm4, xmm10 , 0x1 | |
167 | vpclmulqdq xmm13, xmm5, xmm10, 0x10 | |
168 | vpclmulqdq xmm5, xmm5, xmm10 , 0x1 | |
169 | vpxor xmm4, xmm9 | |
170 | vxorps xmm4, xmm8 | |
171 | vpxor xmm5, xmm12 | |
172 | vxorps xmm5, xmm13 | |
173 | ||
174 | prefetchnta [arg2+fetch_dist+96] | |
175 | vmovdqu xmm9, [arg2+16*6] | |
176 | vmovdqu xmm12, [arg2+16*7] | |
177 | vpclmulqdq xmm8, xmm6, xmm10, 0x10 | |
178 | vpclmulqdq xmm6, xmm6, xmm10 , 0x1 | |
179 | vpclmulqdq xmm13, xmm7, xmm10, 0x10 | |
180 | vpclmulqdq xmm7, xmm7, xmm10 , 0x1 | |
181 | vpxor xmm6, xmm9 | |
182 | vxorps xmm6, xmm8 | |
183 | vpxor xmm7, xmm12 | |
184 | vxorps xmm7, xmm13 | |
185 | ||
186 | sub arg3, 128 | |
187 | jge .fold_128_B_loop | |
188 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
189 | ||
190 | add arg2, 128 | |
191 | ; at this point, the buffer pointer is pointing at the last y Bytes of the buffer, where 0 <= y < 128 | |
192 | ; the 128B of folded data is in 8 of the xmm registers: xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7 | |
193 | ||
194 | ; fold the 8 xmm registers to 1 xmm register with different constants | |
195 | vmovdqa xmm10, [rk9] | |
196 | vpclmulqdq xmm8, xmm0, xmm10, 0x1 | |
197 | vpclmulqdq xmm0, xmm0, xmm10, 0x10 | |
198 | vpxor xmm7, xmm8 | |
199 | vxorps xmm7, xmm0 | |
200 | ||
201 | vmovdqa xmm10, [rk11] | |
202 | vpclmulqdq xmm8, xmm1, xmm10, 0x1 | |
203 | vpclmulqdq xmm1, xmm1, xmm10, 0x10 | |
204 | vpxor xmm7, xmm8 | |
205 | vxorps xmm7, xmm1 | |
206 | ||
207 | vmovdqa xmm10, [rk13] | |
208 | vpclmulqdq xmm8, xmm2, xmm10, 0x1 | |
209 | vpclmulqdq xmm2, xmm2, xmm10, 0x10 | |
210 | vpxor xmm7, xmm8 | |
211 | vpxor xmm7, xmm2 | |
212 | ||
213 | vmovdqa xmm10, [rk15] | |
214 | vpclmulqdq xmm8, xmm3, xmm10, 0x1 | |
215 | vpclmulqdq xmm3, xmm3, xmm10, 0x10 | |
216 | vpxor xmm7, xmm8 | |
217 | vxorps xmm7, xmm3 | |
218 | ||
219 | vmovdqa xmm10, [rk17] | |
220 | vpclmulqdq xmm8, xmm4, xmm10, 0x1 | |
221 | vpclmulqdq xmm4, xmm4, xmm10, 0x10 | |
222 | vpxor xmm7, xmm8 | |
223 | vpxor xmm7, xmm4 | |
224 | ||
225 | vmovdqa xmm10, [rk19] | |
226 | vpclmulqdq xmm8, xmm5, xmm10, 0x1 | |
227 | vpclmulqdq xmm5, xmm5, xmm10, 0x10 | |
228 | vpxor xmm7, xmm8 | |
229 | vxorps xmm7, xmm5 | |
230 | ||
231 | vmovdqa xmm10, [rk1] | |
232 | vpclmulqdq xmm8, xmm6, xmm10, 0x1 | |
233 | vpclmulqdq xmm6, xmm6, xmm10, 0x10 | |
234 | vpxor xmm7, xmm8 | |
235 | vpxor xmm7, xmm6 | |
236 | ||
237 | ||
238 | ; instead of 128, we add 128-16 to the loop counter to save 1 instruction from the loop | |
239 | ; instead of a cmp instruction, we use the negative flag with the jl instruction | |
240 | add arg3, 128-16 | |
241 | jl .final_reduction_for_128 | |
242 | ||
243 | ; now we have 16+y bytes left to reduce. 16 Bytes is in register xmm7 and the rest is in memory | |
244 | ; we can fold 16 bytes at a time if y>=16 | |
245 | ; continue folding 16B at a time | |
246 | ||
247 | .16B_reduction_loop: | |
248 | vpclmulqdq xmm8, xmm7, xmm10, 0x1 | |
249 | vpclmulqdq xmm7, xmm7, xmm10, 0x10 | |
250 | vpxor xmm7, xmm8 | |
251 | vmovdqu xmm0, [arg2] | |
252 | vpxor xmm7, xmm0 | |
253 | add arg2, 16 | |
254 | sub arg3, 16 | |
255 | ; instead of a cmp instruction, we utilize the flags with the jge instruction | |
256 | ; equivalent of: cmp arg3, 16-16 | |
257 | ; check if there is any more 16B in the buffer to be able to fold | |
258 | jge .16B_reduction_loop | |
259 | ||
260 | ;now we have 16+z bytes left to reduce, where 0<= z < 16. | |
261 | ;first, we reduce the data in the xmm7 register | |
262 | ||
263 | ||
264 | .final_reduction_for_128: | |
265 | add arg3, 16 | |
266 | je .128_done | |
267 | ||
268 | ; here we are getting data that is less than 16 bytes. | |
269 | ; since we know that there was data before the pointer, we can offset | |
270 | ; the input pointer before the actual point, to receive exactly 16 bytes. | |
271 | ; after that the registers need to be adjusted. | |
272 | .get_last_two_xmms: | |
273 | ||
274 | vmovdqa xmm2, xmm7 | |
275 | vmovdqu xmm1, [arg2 - 16 + arg3] | |
276 | ||
277 | ; get rid of the extra data that was loaded before | |
278 | ; load the shift constant | |
279 | lea rax, [pshufb_shf_table] | |
280 | add rax, arg3 | |
281 | vmovdqu xmm0, [rax] | |
282 | ||
283 | vpshufb xmm7, xmm0 | |
284 | vpxor xmm0, [mask3] | |
285 | vpshufb xmm2, xmm0 | |
286 | ||
287 | vpblendvb xmm2, xmm2, xmm1, xmm0 | |
288 | ;;;;;;;;;; | |
289 | vpclmulqdq xmm8, xmm7, xmm10, 0x1 | |
290 | vpclmulqdq xmm7, xmm7, xmm10, 0x10 | |
291 | vpxor xmm7, xmm8 | |
292 | vpxor xmm7, xmm2 | |
293 | ||
294 | .128_done: | |
295 | ; compute crc of a 128-bit value | |
296 | vmovdqa xmm10, [rk5] | |
297 | vmovdqa xmm0, xmm7 | |
298 | ||
299 | ;64b fold | |
300 | vpclmulqdq xmm7, xmm10, 0 | |
301 | vpsrldq xmm0, 8 | |
302 | vpxor xmm7, xmm0 | |
303 | ||
304 | ;32b fold | |
305 | vmovdqa xmm0, xmm7 | |
306 | vpslldq xmm7, 4 | |
307 | vpclmulqdq xmm7, xmm10, 0x10 | |
308 | vpxor xmm7, xmm0 | |
309 | ||
310 | ||
311 | ;barrett reduction | |
312 | .barrett: | |
313 | vpand xmm7, [mask2] | |
314 | vmovdqa xmm1, xmm7 | |
315 | vmovdqa xmm2, xmm7 | |
316 | vmovdqa xmm10, [rk7] | |
317 | ||
318 | vpclmulqdq xmm7, xmm10, 0 | |
319 | vpxor xmm7, xmm2 | |
320 | vpand xmm7, [mask] | |
321 | vmovdqa xmm2, xmm7 | |
322 | vpclmulqdq xmm7, xmm10, 0x10 | |
323 | vpxor xmm7, xmm2 | |
324 | vpxor xmm7, xmm1 | |
325 | vpextrd eax, xmm7, 2 | |
326 | ||
327 | .cleanup: | |
328 | not eax | |
329 | ||
330 | ||
331 | %ifidn __OUTPUT_FORMAT__, win64 | |
332 | vmovdqa xmm6, [rsp + XMM_SAVE + 16*0] | |
333 | vmovdqa xmm7, [rsp + XMM_SAVE + 16*1] | |
334 | vmovdqa xmm8, [rsp + XMM_SAVE + 16*2] | |
335 | vmovdqa xmm9, [rsp + XMM_SAVE + 16*3] | |
336 | vmovdqa xmm10, [rsp + XMM_SAVE + 16*4] | |
337 | vmovdqa xmm11, [rsp + XMM_SAVE + 16*5] | |
338 | vmovdqa xmm12, [rsp + XMM_SAVE + 16*6] | |
339 | vmovdqa xmm13, [rsp + XMM_SAVE + 16*7] | |
340 | %endif | |
341 | add rsp, VARIABLE_OFFSET | |
342 | ret | |
343 | ||
344 | ||
345 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
346 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
347 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
348 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
349 | ||
350 | align 16 | |
351 | .less_than_256: | |
352 | ||
353 | ; check if there is enough buffer to be able to fold 16B at a time | |
354 | cmp arg3, 32 | |
355 | jl .less_than_32 | |
356 | ||
357 | ; if there is, load the constants | |
358 | vmovdqa xmm10, [rk1] ; rk1 and rk2 in xmm10 | |
359 | ||
360 | vmovd xmm0, arg1_low32 ; get the initial crc value | |
361 | vmovdqu xmm7, [arg2] ; load the plaintext | |
362 | vpxor xmm7, xmm0 | |
363 | ||
364 | ; update the buffer pointer | |
365 | add arg2, 16 | |
366 | ||
367 | ; update the counter. subtract 32 instead of 16 to save one instruction from the loop | |
368 | sub arg3, 32 | |
369 | ||
370 | jmp .16B_reduction_loop | |
371 | ||
372 | ||
373 | align 16 | |
374 | .less_than_32: | |
375 | ; mov initial crc to the return value. this is necessary for zero-length buffers. | |
376 | mov eax, arg1_low32 | |
377 | test arg3, arg3 | |
378 | je .cleanup | |
379 | ||
380 | vmovd xmm0, arg1_low32 ; get the initial crc value | |
381 | ||
382 | cmp arg3, 16 | |
383 | je .exact_16_left | |
384 | jl .less_than_16_left | |
385 | ||
386 | vmovdqu xmm7, [arg2] ; load the plaintext | |
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 | vpxor xmm7, xmm0 ; xor the initial crc value | |
448 | ||
449 | lea rax,[pshufb_shf_table] | |
450 | vmovdqu xmm0, [rax + r9] | |
451 | vpshufb xmm7,xmm0 | |
452 | jmp .128_done | |
453 | ||
454 | align 16 | |
455 | .exact_16_left: | |
456 | vmovdqu xmm7, [arg2] | |
457 | vpxor xmm7, xmm0 ; xor the initial crc value | |
458 | jmp .128_done | |
459 | ||
460 | .only_less_than_4: | |
461 | cmp arg3, 3 | |
462 | jl .only_less_than_3 | |
463 | ||
464 | ; load 3 Bytes | |
465 | mov al, [arg2] | |
466 | mov [r11], al | |
467 | ||
468 | mov al, [arg2+1] | |
469 | mov [r11+1], al | |
470 | ||
471 | mov al, [arg2+2] | |
472 | mov [r11+2], al | |
473 | ||
474 | vmovdqa xmm7, [rsp] | |
475 | vpxor xmm7, xmm0 ; xor the initial crc value | |
476 | ||
477 | vpslldq xmm7, 5 | |
478 | jmp .barrett | |
479 | ||
480 | .only_less_than_3: | |
481 | cmp arg3, 2 | |
482 | jl .only_less_than_2 | |
483 | ||
484 | ; load 2 Bytes | |
485 | mov al, [arg2] | |
486 | mov [r11], al | |
487 | ||
488 | mov al, [arg2+1] | |
489 | mov [r11+1], al | |
490 | ||
491 | vmovdqa xmm7, [rsp] | |
492 | vpxor xmm7, xmm0 ; xor the initial crc value | |
493 | ||
494 | vpslldq xmm7, 6 | |
495 | jmp .barrett | |
496 | ||
497 | .only_less_than_2: | |
498 | ; load 1 Byte | |
499 | mov al, [arg2] | |
500 | mov [r11], al | |
501 | ||
502 | vmovdqa xmm7, [rsp] | |
503 | vpxor xmm7, xmm0 ; xor the initial crc value | |
504 | ||
505 | vpslldq xmm7, 7 | |
506 | jmp .barrett | |
507 | ||
508 | section .data | |
509 | ||
510 | ; precomputed constants | |
511 | align 16 | |
512 | rk1: dq 0x00000000ccaa009e | |
513 | rk2: dq 0x00000001751997d0 | |
514 | rk3: dq 0x000000014a7fe880 | |
515 | rk4: dq 0x00000001e88ef372 | |
516 | rk5: dq 0x00000000ccaa009e | |
517 | rk6: dq 0x0000000163cd6124 | |
518 | rk7: dq 0x00000001f7011640 | |
519 | rk8: dq 0x00000001db710640 | |
520 | rk9: dq 0x00000001d7cfc6ac | |
521 | rk10: dq 0x00000001ea89367e | |
522 | rk11: dq 0x000000018cb44e58 | |
523 | rk12: dq 0x00000000df068dc2 | |
524 | rk13: dq 0x00000000ae0b5394 | |
525 | rk14: dq 0x00000001c7569e54 | |
526 | rk15: dq 0x00000001c6e41596 | |
527 | rk16: dq 0x0000000154442bd4 | |
528 | rk17: dq 0x0000000174359406 | |
529 | rk18: dq 0x000000003db1ecdc | |
530 | rk19: dq 0x000000015a546366 | |
531 | rk20: dq 0x00000000f1da05aa | |
532 | ||
533 | mask: dq 0xFFFFFFFFFFFFFFFF, 0x0000000000000000 | |
534 | mask2: dq 0xFFFFFFFF00000000, 0xFFFFFFFFFFFFFFFF | |
535 | mask3: dq 0x8080808080808080, 0x8080808080808080 | |
536 | ||
537 | pshufb_shf_table: | |
538 | ; use these values for shift constants for the pshufb instruction | |
539 | ; different alignments result in values as shown: | |
540 | ; dq 0x8887868584838281, 0x008f8e8d8c8b8a89 ; shl 15 (16-1) / shr1 | |
541 | ; dq 0x8988878685848382, 0x01008f8e8d8c8b8a ; shl 14 (16-3) / shr2 | |
542 | ; dq 0x8a89888786858483, 0x0201008f8e8d8c8b ; shl 13 (16-4) / shr3 | |
543 | ; dq 0x8b8a898887868584, 0x030201008f8e8d8c ; shl 12 (16-4) / shr4 | |
544 | ; dq 0x8c8b8a8988878685, 0x04030201008f8e8d ; shl 11 (16-5) / shr5 | |
545 | ; dq 0x8d8c8b8a89888786, 0x0504030201008f8e ; shl 10 (16-6) / shr6 | |
546 | ; dq 0x8e8d8c8b8a898887, 0x060504030201008f ; shl 9 (16-7) / shr7 | |
547 | ; dq 0x8f8e8d8c8b8a8988, 0x0706050403020100 ; shl 8 (16-8) / shr8 | |
548 | ; dq 0x008f8e8d8c8b8a89, 0x0807060504030201 ; shl 7 (16-9) / shr9 | |
549 | ; dq 0x01008f8e8d8c8b8a, 0x0908070605040302 ; shl 6 (16-10) / shr10 | |
550 | ; dq 0x0201008f8e8d8c8b, 0x0a09080706050403 ; shl 5 (16-11) / shr11 | |
551 | ; dq 0x030201008f8e8d8c, 0x0b0a090807060504 ; shl 4 (16-12) / shr12 | |
552 | ; dq 0x04030201008f8e8d, 0x0c0b0a0908070605 ; shl 3 (16-13) / shr13 | |
553 | ; dq 0x0504030201008f8e, 0x0d0c0b0a09080706 ; shl 2 (16-14) / shr14 | |
554 | ; dq 0x060504030201008f, 0x0e0d0c0b0a090807 ; shl 1 (16-15) / shr15 | |
555 | dq 0x8786858483828100, 0x8f8e8d8c8b8a8988 | |
556 | dq 0x0706050403020100, 0x000e0d0c0b0a0908 |