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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 | /* * ChaCha20 256-bit cipher algorithm, RFC7539, x64 AVX2 functions * * Copyright (C) 2015 Martin Willi * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include <linux/linkage.h> .data .align 32 ROT8: .octa 0x0e0d0c0f0a09080b0605040702010003 .octa 0x0e0d0c0f0a09080b0605040702010003 ROT16: .octa 0x0d0c0f0e09080b0a0504070601000302 .octa 0x0d0c0f0e09080b0a0504070601000302 CTRINC: .octa 0x00000003000000020000000100000000 .octa 0x00000007000000060000000500000004 .text ENTRY(chacha20_8block_xor_avx2) # %rdi: Input state matrix, s # %rsi: 8 data blocks output, o # %rdx: 8 data blocks input, i # This function encrypts eight consecutive ChaCha20 blocks by loading # the state matrix in AVX registers eight times. As we need some # scratch registers, we save the first four registers on the stack. The # algorithm performs each operation on the corresponding word of each # state matrix, hence requires no word shuffling. For final XORing step # we transpose the matrix by interleaving 32-, 64- and then 128-bit # words, which allows us to do XOR in AVX registers. 8/16-bit word # rotation is done with the slightly better performing byte shuffling, # 7/12-bit word rotation uses traditional shift+OR. vzeroupper # 4 * 32 byte stack, 32-byte aligned mov %rsp, %r8 and $~31, %rsp sub $0x80, %rsp # x0..15[0-7] = s[0..15] vpbroadcastd 0x00(%rdi),%ymm0 vpbroadcastd 0x04(%rdi),%ymm1 vpbroadcastd 0x08(%rdi),%ymm2 vpbroadcastd 0x0c(%rdi),%ymm3 vpbroadcastd 0x10(%rdi),%ymm4 vpbroadcastd 0x14(%rdi),%ymm5 vpbroadcastd 0x18(%rdi),%ymm6 vpbroadcastd 0x1c(%rdi),%ymm7 vpbroadcastd 0x20(%rdi),%ymm8 vpbroadcastd 0x24(%rdi),%ymm9 vpbroadcastd 0x28(%rdi),%ymm10 vpbroadcastd 0x2c(%rdi),%ymm11 vpbroadcastd 0x30(%rdi),%ymm12 vpbroadcastd 0x34(%rdi),%ymm13 vpbroadcastd 0x38(%rdi),%ymm14 vpbroadcastd 0x3c(%rdi),%ymm15 # x0..3 on stack vmovdqa %ymm0,0x00(%rsp) vmovdqa %ymm1,0x20(%rsp) vmovdqa %ymm2,0x40(%rsp) vmovdqa %ymm3,0x60(%rsp) vmovdqa CTRINC(%rip),%ymm1 vmovdqa ROT8(%rip),%ymm2 vmovdqa ROT16(%rip),%ymm3 # x12 += counter values 0-3 vpaddd %ymm1,%ymm12,%ymm12 mov $10,%ecx .Ldoubleround8: # x0 += x4, x12 = rotl32(x12 ^ x0, 16) vpaddd 0x00(%rsp),%ymm4,%ymm0 vmovdqa %ymm0,0x00(%rsp) vpxor %ymm0,%ymm12,%ymm12 vpshufb %ymm3,%ymm12,%ymm12 # x1 += x5, x13 = rotl32(x13 ^ x1, 16) vpaddd 0x20(%rsp),%ymm5,%ymm0 vmovdqa %ymm0,0x20(%rsp) vpxor %ymm0,%ymm13,%ymm13 vpshufb %ymm3,%ymm13,%ymm13 # x2 += x6, x14 = rotl32(x14 ^ x2, 16) vpaddd 0x40(%rsp),%ymm6,%ymm0 vmovdqa %ymm0,0x40(%rsp) vpxor %ymm0,%ymm14,%ymm14 vpshufb %ymm3,%ymm14,%ymm14 # x3 += x7, x15 = rotl32(x15 ^ x3, 16) vpaddd 0x60(%rsp),%ymm7,%ymm0 vmovdqa %ymm0,0x60(%rsp) vpxor %ymm0,%ymm15,%ymm15 vpshufb %ymm3,%ymm15,%ymm15 # x8 += x12, x4 = rotl32(x4 ^ x8, 12) vpaddd %ymm12,%ymm8,%ymm8 vpxor %ymm8,%ymm4,%ymm4 vpslld $12,%ymm4,%ymm0 vpsrld $20,%ymm4,%ymm4 vpor %ymm0,%ymm4,%ymm4 # x9 += x13, x5 = rotl32(x5 ^ x9, 12) vpaddd %ymm13,%ymm9,%ymm9 vpxor %ymm9,%ymm5,%ymm5 vpslld $12,%ymm5,%ymm0 vpsrld $20,%ymm5,%ymm5 vpor %ymm0,%ymm5,%ymm5 # x10 += x14, x6 = rotl32(x6 ^ x10, 12) vpaddd %ymm14,%ymm10,%ymm10 vpxor %ymm10,%ymm6,%ymm6 vpslld $12,%ymm6,%ymm0 vpsrld $20,%ymm6,%ymm6 vpor %ymm0,%ymm6,%ymm6 # x11 += x15, x7 = rotl32(x7 ^ x11, 12) vpaddd %ymm15,%ymm11,%ymm11 vpxor %ymm11,%ymm7,%ymm7 vpslld $12,%ymm7,%ymm0 vpsrld $20,%ymm7,%ymm7 vpor %ymm0,%ymm7,%ymm7 # x0 += x4, x12 = rotl32(x12 ^ x0, 8) vpaddd 0x00(%rsp),%ymm4,%ymm0 vmovdqa %ymm0,0x00(%rsp) vpxor %ymm0,%ymm12,%ymm12 vpshufb %ymm2,%ymm12,%ymm12 # x1 += x5, x13 = rotl32(x13 ^ x1, 8) vpaddd 0x20(%rsp),%ymm5,%ymm0 vmovdqa %ymm0,0x20(%rsp) vpxor %ymm0,%ymm13,%ymm13 vpshufb %ymm2,%ymm13,%ymm13 # x2 += x6, x14 = rotl32(x14 ^ x2, 8) vpaddd 0x40(%rsp),%ymm6,%ymm0 vmovdqa %ymm0,0x40(%rsp) vpxor %ymm0,%ymm14,%ymm14 vpshufb %ymm2,%ymm14,%ymm14 # x3 += x7, x15 = rotl32(x15 ^ x3, 8) vpaddd 0x60(%rsp),%ymm7,%ymm0 vmovdqa %ymm0,0x60(%rsp) vpxor %ymm0,%ymm15,%ymm15 vpshufb %ymm2,%ymm15,%ymm15 # x8 += x12, x4 = rotl32(x4 ^ x8, 7) vpaddd %ymm12,%ymm8,%ymm8 vpxor %ymm8,%ymm4,%ymm4 vpslld $7,%ymm4,%ymm0 vpsrld $25,%ymm4,%ymm4 vpor %ymm0,%ymm4,%ymm4 # x9 += x13, x5 = rotl32(x5 ^ x9, 7) vpaddd %ymm13,%ymm9,%ymm9 vpxor %ymm9,%ymm5,%ymm5 vpslld $7,%ymm5,%ymm0 vpsrld $25,%ymm5,%ymm5 vpor %ymm0,%ymm5,%ymm5 # x10 += x14, x6 = rotl32(x6 ^ x10, 7) vpaddd %ymm14,%ymm10,%ymm10 vpxor %ymm10,%ymm6,%ymm6 vpslld $7,%ymm6,%ymm0 vpsrld $25,%ymm6,%ymm6 vpor %ymm0,%ymm6,%ymm6 # x11 += x15, x7 = rotl32(x7 ^ x11, 7) vpaddd %ymm15,%ymm11,%ymm11 vpxor %ymm11,%ymm7,%ymm7 vpslld $7,%ymm7,%ymm0 vpsrld $25,%ymm7,%ymm7 vpor %ymm0,%ymm7,%ymm7 # x0 += x5, x15 = rotl32(x15 ^ x0, 16) vpaddd 0x00(%rsp),%ymm5,%ymm0 vmovdqa %ymm0,0x00(%rsp) vpxor %ymm0,%ymm15,%ymm15 vpshufb %ymm3,%ymm15,%ymm15 # x1 += x6, x12 = rotl32(x12 ^ x1, 16)%ymm0 vpaddd 0x20(%rsp),%ymm6,%ymm0 vmovdqa %ymm0,0x20(%rsp) vpxor %ymm0,%ymm12,%ymm12 vpshufb %ymm3,%ymm12,%ymm12 # x2 += x7, x13 = rotl32(x13 ^ x2, 16) vpaddd 0x40(%rsp),%ymm7,%ymm0 vmovdqa %ymm0,0x40(%rsp) vpxor %ymm0,%ymm13,%ymm13 vpshufb %ymm3,%ymm13,%ymm13 # x3 += x4, x14 = rotl32(x14 ^ x3, 16) vpaddd 0x60(%rsp),%ymm4,%ymm0 vmovdqa %ymm0,0x60(%rsp) vpxor %ymm0,%ymm14,%ymm14 vpshufb %ymm3,%ymm14,%ymm14 # x10 += x15, x5 = rotl32(x5 ^ x10, 12) vpaddd %ymm15,%ymm10,%ymm10 vpxor %ymm10,%ymm5,%ymm5 vpslld $12,%ymm5,%ymm0 vpsrld $20,%ymm5,%ymm5 vpor %ymm0,%ymm5,%ymm5 # x11 += x12, x6 = rotl32(x6 ^ x11, 12) vpaddd %ymm12,%ymm11,%ymm11 vpxor %ymm11,%ymm6,%ymm6 vpslld $12,%ymm6,%ymm0 vpsrld $20,%ymm6,%ymm6 vpor %ymm0,%ymm6,%ymm6 # x8 += x13, x7 = rotl32(x7 ^ x8, 12) vpaddd %ymm13,%ymm8,%ymm8 vpxor %ymm8,%ymm7,%ymm7 vpslld $12,%ymm7,%ymm0 vpsrld $20,%ymm7,%ymm7 vpor %ymm0,%ymm7,%ymm7 # x9 += x14, x4 = rotl32(x4 ^ x9, 12) vpaddd %ymm14,%ymm9,%ymm9 vpxor %ymm9,%ymm4,%ymm4 vpslld $12,%ymm4,%ymm0 vpsrld $20,%ymm4,%ymm4 vpor %ymm0,%ymm4,%ymm4 # x0 += x5, x15 = rotl32(x15 ^ x0, 8) vpaddd 0x00(%rsp),%ymm5,%ymm0 vmovdqa %ymm0,0x00(%rsp) vpxor %ymm0,%ymm15,%ymm15 vpshufb %ymm2,%ymm15,%ymm15 # x1 += x6, x12 = rotl32(x12 ^ x1, 8) vpaddd 0x20(%rsp),%ymm6,%ymm0 vmovdqa %ymm0,0x20(%rsp) vpxor %ymm0,%ymm12,%ymm12 vpshufb %ymm2,%ymm12,%ymm12 # x2 += x7, x13 = rotl32(x13 ^ x2, 8) vpaddd 0x40(%rsp),%ymm7,%ymm0 vmovdqa %ymm0,0x40(%rsp) vpxor %ymm0,%ymm13,%ymm13 vpshufb %ymm2,%ymm13,%ymm13 # x3 += x4, x14 = rotl32(x14 ^ x3, 8) vpaddd 0x60(%rsp),%ymm4,%ymm0 vmovdqa %ymm0,0x60(%rsp) vpxor %ymm0,%ymm14,%ymm14 vpshufb %ymm2,%ymm14,%ymm14 # x10 += x15, x5 = rotl32(x5 ^ x10, 7) vpaddd %ymm15,%ymm10,%ymm10 vpxor %ymm10,%ymm5,%ymm5 vpslld $7,%ymm5,%ymm0 vpsrld $25,%ymm5,%ymm5 vpor %ymm0,%ymm5,%ymm5 # x11 += x12, x6 = rotl32(x6 ^ x11, 7) vpaddd %ymm12,%ymm11,%ymm11 vpxor %ymm11,%ymm6,%ymm6 vpslld $7,%ymm6,%ymm0 vpsrld $25,%ymm6,%ymm6 vpor %ymm0,%ymm6,%ymm6 # x8 += x13, x7 = rotl32(x7 ^ x8, 7) vpaddd %ymm13,%ymm8,%ymm8 vpxor %ymm8,%ymm7,%ymm7 vpslld $7,%ymm7,%ymm0 vpsrld $25,%ymm7,%ymm7 vpor %ymm0,%ymm7,%ymm7 # x9 += x14, x4 = rotl32(x4 ^ x9, 7) vpaddd %ymm14,%ymm9,%ymm9 vpxor %ymm9,%ymm4,%ymm4 vpslld $7,%ymm4,%ymm0 vpsrld $25,%ymm4,%ymm4 vpor %ymm0,%ymm4,%ymm4 dec %ecx jnz .Ldoubleround8 # x0..15[0-3] += s[0..15] vpbroadcastd 0x00(%rdi),%ymm0 vpaddd 0x00(%rsp),%ymm0,%ymm0 vmovdqa %ymm0,0x00(%rsp) vpbroadcastd 0x04(%rdi),%ymm0 vpaddd 0x20(%rsp),%ymm0,%ymm0 vmovdqa %ymm0,0x20(%rsp) vpbroadcastd 0x08(%rdi),%ymm0 vpaddd 0x40(%rsp),%ymm0,%ymm0 vmovdqa %ymm0,0x40(%rsp) vpbroadcastd 0x0c(%rdi),%ymm0 vpaddd 0x60(%rsp),%ymm0,%ymm0 vmovdqa %ymm0,0x60(%rsp) vpbroadcastd 0x10(%rdi),%ymm0 vpaddd %ymm0,%ymm4,%ymm4 vpbroadcastd 0x14(%rdi),%ymm0 vpaddd %ymm0,%ymm5,%ymm5 vpbroadcastd 0x18(%rdi),%ymm0 vpaddd %ymm0,%ymm6,%ymm6 vpbroadcastd 0x1c(%rdi),%ymm0 vpaddd %ymm0,%ymm7,%ymm7 vpbroadcastd 0x20(%rdi),%ymm0 vpaddd %ymm0,%ymm8,%ymm8 vpbroadcastd 0x24(%rdi),%ymm0 vpaddd %ymm0,%ymm9,%ymm9 vpbroadcastd 0x28(%rdi),%ymm0 vpaddd %ymm0,%ymm10,%ymm10 vpbroadcastd 0x2c(%rdi),%ymm0 vpaddd %ymm0,%ymm11,%ymm11 vpbroadcastd 0x30(%rdi),%ymm0 vpaddd %ymm0,%ymm12,%ymm12 vpbroadcastd 0x34(%rdi),%ymm0 vpaddd %ymm0,%ymm13,%ymm13 vpbroadcastd 0x38(%rdi),%ymm0 vpaddd %ymm0,%ymm14,%ymm14 vpbroadcastd 0x3c(%rdi),%ymm0 vpaddd %ymm0,%ymm15,%ymm15 # x12 += counter values 0-3 vpaddd %ymm1,%ymm12,%ymm12 # interleave 32-bit words in state n, n+1 vmovdqa 0x00(%rsp),%ymm0 vmovdqa 0x20(%rsp),%ymm1 vpunpckldq %ymm1,%ymm0,%ymm2 vpunpckhdq %ymm1,%ymm0,%ymm1 vmovdqa %ymm2,0x00(%rsp) vmovdqa %ymm1,0x20(%rsp) vmovdqa 0x40(%rsp),%ymm0 vmovdqa 0x60(%rsp),%ymm1 vpunpckldq %ymm1,%ymm0,%ymm2 vpunpckhdq %ymm1,%ymm0,%ymm1 vmovdqa %ymm2,0x40(%rsp) vmovdqa %ymm1,0x60(%rsp) vmovdqa %ymm4,%ymm0 vpunpckldq %ymm5,%ymm0,%ymm4 vpunpckhdq %ymm5,%ymm0,%ymm5 vmovdqa %ymm6,%ymm0 vpunpckldq %ymm7,%ymm0,%ymm6 vpunpckhdq %ymm7,%ymm0,%ymm7 vmovdqa %ymm8,%ymm0 vpunpckldq %ymm9,%ymm0,%ymm8 vpunpckhdq %ymm9,%ymm0,%ymm9 vmovdqa %ymm10,%ymm0 vpunpckldq %ymm11,%ymm0,%ymm10 vpunpckhdq %ymm11,%ymm0,%ymm11 vmovdqa %ymm12,%ymm0 vpunpckldq %ymm13,%ymm0,%ymm12 vpunpckhdq %ymm13,%ymm0,%ymm13 vmovdqa %ymm14,%ymm0 vpunpckldq %ymm15,%ymm0,%ymm14 vpunpckhdq %ymm15,%ymm0,%ymm15 # interleave 64-bit words in state n, n+2 vmovdqa 0x00(%rsp),%ymm0 vmovdqa 0x40(%rsp),%ymm2 vpunpcklqdq %ymm2,%ymm0,%ymm1 vpunpckhqdq %ymm2,%ymm0,%ymm2 vmovdqa %ymm1,0x00(%rsp) vmovdqa %ymm2,0x40(%rsp) vmovdqa 0x20(%rsp),%ymm0 vmovdqa 0x60(%rsp),%ymm2 vpunpcklqdq %ymm2,%ymm0,%ymm1 vpunpckhqdq %ymm2,%ymm0,%ymm2 vmovdqa %ymm1,0x20(%rsp) vmovdqa %ymm2,0x60(%rsp) vmovdqa %ymm4,%ymm0 vpunpcklqdq %ymm6,%ymm0,%ymm4 vpunpckhqdq %ymm6,%ymm0,%ymm6 vmovdqa %ymm5,%ymm0 vpunpcklqdq %ymm7,%ymm0,%ymm5 vpunpckhqdq %ymm7,%ymm0,%ymm7 vmovdqa %ymm8,%ymm0 vpunpcklqdq %ymm10,%ymm0,%ymm8 vpunpckhqdq %ymm10,%ymm0,%ymm10 vmovdqa %ymm9,%ymm0 vpunpcklqdq %ymm11,%ymm0,%ymm9 vpunpckhqdq %ymm11,%ymm0,%ymm11 vmovdqa %ymm12,%ymm0 vpunpcklqdq %ymm14,%ymm0,%ymm12 vpunpckhqdq %ymm14,%ymm0,%ymm14 vmovdqa %ymm13,%ymm0 vpunpcklqdq %ymm15,%ymm0,%ymm13 vpunpckhqdq %ymm15,%ymm0,%ymm15 # interleave 128-bit words in state n, n+4 vmovdqa 0x00(%rsp),%ymm0 vperm2i128 $0x20,%ymm4,%ymm0,%ymm1 vperm2i128 $0x31,%ymm4,%ymm0,%ymm4 vmovdqa %ymm1,0x00(%rsp) vmovdqa 0x20(%rsp),%ymm0 vperm2i128 $0x20,%ymm5,%ymm0,%ymm1 vperm2i128 $0x31,%ymm5,%ymm0,%ymm5 vmovdqa %ymm1,0x20(%rsp) vmovdqa 0x40(%rsp),%ymm0 vperm2i128 $0x20,%ymm6,%ymm0,%ymm1 vperm2i128 $0x31,%ymm6,%ymm0,%ymm6 vmovdqa %ymm1,0x40(%rsp) vmovdqa 0x60(%rsp),%ymm0 vperm2i128 $0x20,%ymm7,%ymm0,%ymm1 vperm2i128 $0x31,%ymm7,%ymm0,%ymm7 vmovdqa %ymm1,0x60(%rsp) vperm2i128 $0x20,%ymm12,%ymm8,%ymm0 vperm2i128 $0x31,%ymm12,%ymm8,%ymm12 vmovdqa %ymm0,%ymm8 vperm2i128 $0x20,%ymm13,%ymm9,%ymm0 vperm2i128 $0x31,%ymm13,%ymm9,%ymm13 vmovdqa %ymm0,%ymm9 vperm2i128 $0x20,%ymm14,%ymm10,%ymm0 vperm2i128 $0x31,%ymm14,%ymm10,%ymm14 vmovdqa %ymm0,%ymm10 vperm2i128 $0x20,%ymm15,%ymm11,%ymm0 vperm2i128 $0x31,%ymm15,%ymm11,%ymm15 vmovdqa %ymm0,%ymm11 # xor with corresponding input, write to output vmovdqa 0x00(%rsp),%ymm0 vpxor 0x0000(%rdx),%ymm0,%ymm0 vmovdqu %ymm0,0x0000(%rsi) vmovdqa 0x20(%rsp),%ymm0 vpxor 0x0080(%rdx),%ymm0,%ymm0 vmovdqu %ymm0,0x0080(%rsi) vmovdqa 0x40(%rsp),%ymm0 vpxor 0x0040(%rdx),%ymm0,%ymm0 vmovdqu %ymm0,0x0040(%rsi) vmovdqa 0x60(%rsp),%ymm0 vpxor 0x00c0(%rdx),%ymm0,%ymm0 vmovdqu %ymm0,0x00c0(%rsi) vpxor 0x0100(%rdx),%ymm4,%ymm4 vmovdqu %ymm4,0x0100(%rsi) vpxor 0x0180(%rdx),%ymm5,%ymm5 vmovdqu %ymm5,0x00180(%rsi) vpxor 0x0140(%rdx),%ymm6,%ymm6 vmovdqu %ymm6,0x0140(%rsi) vpxor 0x01c0(%rdx),%ymm7,%ymm7 vmovdqu %ymm7,0x01c0(%rsi) vpxor 0x0020(%rdx),%ymm8,%ymm8 vmovdqu %ymm8,0x0020(%rsi) vpxor 0x00a0(%rdx),%ymm9,%ymm9 vmovdqu %ymm9,0x00a0(%rsi) vpxor 0x0060(%rdx),%ymm10,%ymm10 vmovdqu %ymm10,0x0060(%rsi) vpxor 0x00e0(%rdx),%ymm11,%ymm11 vmovdqu %ymm11,0x00e0(%rsi) vpxor 0x0120(%rdx),%ymm12,%ymm12 vmovdqu %ymm12,0x0120(%rsi) vpxor 0x01a0(%rdx),%ymm13,%ymm13 vmovdqu %ymm13,0x01a0(%rsi) vpxor 0x0160(%rdx),%ymm14,%ymm14 vmovdqu %ymm14,0x0160(%rsi) vpxor 0x01e0(%rdx),%ymm15,%ymm15 vmovdqu %ymm15,0x01e0(%rsi) vzeroupper mov %r8,%rsp ret ENDPROC(chacha20_8block_xor_avx2) |