root/arch/x86/crypto/chacha-avx512vl-x86_64.S

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * ChaCha 256-bit cipher algorithm, x64 AVX-512VL functions
   4  *
   5  * Copyright (C) 2018 Martin Willi
   6  */
   7 
   8 #include <linux/linkage.h>
   9 
  10 .section        .rodata.cst32.CTR2BL, "aM", @progbits, 32
  11 .align 32
  12 CTR2BL: .octa 0x00000000000000000000000000000000
  13         .octa 0x00000000000000000000000000000001
  14 
  15 .section        .rodata.cst32.CTR4BL, "aM", @progbits, 32
  16 .align 32
  17 CTR4BL: .octa 0x00000000000000000000000000000002
  18         .octa 0x00000000000000000000000000000003
  19 
  20 .section        .rodata.cst32.CTR8BL, "aM", @progbits, 32
  21 .align 32
  22 CTR8BL: .octa 0x00000003000000020000000100000000
  23         .octa 0x00000007000000060000000500000004
  24 
  25 .text
  26 
  27 ENTRY(chacha_2block_xor_avx512vl)
  28         # %rdi: Input state matrix, s
  29         # %rsi: up to 2 data blocks output, o
  30         # %rdx: up to 2 data blocks input, i
  31         # %rcx: input/output length in bytes
  32         # %r8d: nrounds
  33 
  34         # This function encrypts two ChaCha blocks by loading the state
  35         # matrix twice across four AVX registers. It performs matrix operations
  36         # on four words in each matrix in parallel, but requires shuffling to
  37         # rearrange the words after each round.
  38 
  39         vzeroupper
  40 
  41         # x0..3[0-2] = s0..3
  42         vbroadcasti128  0x00(%rdi),%ymm0
  43         vbroadcasti128  0x10(%rdi),%ymm1
  44         vbroadcasti128  0x20(%rdi),%ymm2
  45         vbroadcasti128  0x30(%rdi),%ymm3
  46 
  47         vpaddd          CTR2BL(%rip),%ymm3,%ymm3
  48 
  49         vmovdqa         %ymm0,%ymm8
  50         vmovdqa         %ymm1,%ymm9
  51         vmovdqa         %ymm2,%ymm10
  52         vmovdqa         %ymm3,%ymm11
  53 
  54 .Ldoubleround:
  55 
  56         # x0 += x1, x3 = rotl32(x3 ^ x0, 16)
  57         vpaddd          %ymm1,%ymm0,%ymm0
  58         vpxord          %ymm0,%ymm3,%ymm3
  59         vprold          $16,%ymm3,%ymm3
  60 
  61         # x2 += x3, x1 = rotl32(x1 ^ x2, 12)
  62         vpaddd          %ymm3,%ymm2,%ymm2
  63         vpxord          %ymm2,%ymm1,%ymm1
  64         vprold          $12,%ymm1,%ymm1
  65 
  66         # x0 += x1, x3 = rotl32(x3 ^ x0, 8)
  67         vpaddd          %ymm1,%ymm0,%ymm0
  68         vpxord          %ymm0,%ymm3,%ymm3
  69         vprold          $8,%ymm3,%ymm3
  70 
  71         # x2 += x3, x1 = rotl32(x1 ^ x2, 7)
  72         vpaddd          %ymm3,%ymm2,%ymm2
  73         vpxord          %ymm2,%ymm1,%ymm1
  74         vprold          $7,%ymm1,%ymm1
  75 
  76         # x1 = shuffle32(x1, MASK(0, 3, 2, 1))
  77         vpshufd         $0x39,%ymm1,%ymm1
  78         # x2 = shuffle32(x2, MASK(1, 0, 3, 2))
  79         vpshufd         $0x4e,%ymm2,%ymm2
  80         # x3 = shuffle32(x3, MASK(2, 1, 0, 3))
  81         vpshufd         $0x93,%ymm3,%ymm3
  82 
  83         # x0 += x1, x3 = rotl32(x3 ^ x0, 16)
  84         vpaddd          %ymm1,%ymm0,%ymm0
  85         vpxord          %ymm0,%ymm3,%ymm3
  86         vprold          $16,%ymm3,%ymm3
  87 
  88         # x2 += x3, x1 = rotl32(x1 ^ x2, 12)
  89         vpaddd          %ymm3,%ymm2,%ymm2
  90         vpxord          %ymm2,%ymm1,%ymm1
  91         vprold          $12,%ymm1,%ymm1
  92 
  93         # x0 += x1, x3 = rotl32(x3 ^ x0, 8)
  94         vpaddd          %ymm1,%ymm0,%ymm0
  95         vpxord          %ymm0,%ymm3,%ymm3
  96         vprold          $8,%ymm3,%ymm3
  97 
  98         # x2 += x3, x1 = rotl32(x1 ^ x2, 7)
  99         vpaddd          %ymm3,%ymm2,%ymm2
 100         vpxord          %ymm2,%ymm1,%ymm1
 101         vprold          $7,%ymm1,%ymm1
 102 
 103         # x1 = shuffle32(x1, MASK(2, 1, 0, 3))
 104         vpshufd         $0x93,%ymm1,%ymm1
 105         # x2 = shuffle32(x2, MASK(1, 0, 3, 2))
 106         vpshufd         $0x4e,%ymm2,%ymm2
 107         # x3 = shuffle32(x3, MASK(0, 3, 2, 1))
 108         vpshufd         $0x39,%ymm3,%ymm3
 109 
 110         sub             $2,%r8d
 111         jnz             .Ldoubleround
 112 
 113         # o0 = i0 ^ (x0 + s0)
 114         vpaddd          %ymm8,%ymm0,%ymm7
 115         cmp             $0x10,%rcx
 116         jl              .Lxorpart2
 117         vpxord          0x00(%rdx),%xmm7,%xmm6
 118         vmovdqu         %xmm6,0x00(%rsi)
 119         vextracti128    $1,%ymm7,%xmm0
 120         # o1 = i1 ^ (x1 + s1)
 121         vpaddd          %ymm9,%ymm1,%ymm7
 122         cmp             $0x20,%rcx
 123         jl              .Lxorpart2
 124         vpxord          0x10(%rdx),%xmm7,%xmm6
 125         vmovdqu         %xmm6,0x10(%rsi)
 126         vextracti128    $1,%ymm7,%xmm1
 127         # o2 = i2 ^ (x2 + s2)
 128         vpaddd          %ymm10,%ymm2,%ymm7
 129         cmp             $0x30,%rcx
 130         jl              .Lxorpart2
 131         vpxord          0x20(%rdx),%xmm7,%xmm6
 132         vmovdqu         %xmm6,0x20(%rsi)
 133         vextracti128    $1,%ymm7,%xmm2
 134         # o3 = i3 ^ (x3 + s3)
 135         vpaddd          %ymm11,%ymm3,%ymm7
 136         cmp             $0x40,%rcx
 137         jl              .Lxorpart2
 138         vpxord          0x30(%rdx),%xmm7,%xmm6
 139         vmovdqu         %xmm6,0x30(%rsi)
 140         vextracti128    $1,%ymm7,%xmm3
 141 
 142         # xor and write second block
 143         vmovdqa         %xmm0,%xmm7
 144         cmp             $0x50,%rcx
 145         jl              .Lxorpart2
 146         vpxord          0x40(%rdx),%xmm7,%xmm6
 147         vmovdqu         %xmm6,0x40(%rsi)
 148 
 149         vmovdqa         %xmm1,%xmm7
 150         cmp             $0x60,%rcx
 151         jl              .Lxorpart2
 152         vpxord          0x50(%rdx),%xmm7,%xmm6
 153         vmovdqu         %xmm6,0x50(%rsi)
 154 
 155         vmovdqa         %xmm2,%xmm7
 156         cmp             $0x70,%rcx
 157         jl              .Lxorpart2
 158         vpxord          0x60(%rdx),%xmm7,%xmm6
 159         vmovdqu         %xmm6,0x60(%rsi)
 160 
 161         vmovdqa         %xmm3,%xmm7
 162         cmp             $0x80,%rcx
 163         jl              .Lxorpart2
 164         vpxord          0x70(%rdx),%xmm7,%xmm6
 165         vmovdqu         %xmm6,0x70(%rsi)
 166 
 167 .Ldone2:
 168         vzeroupper
 169         ret
 170 
 171 .Lxorpart2:
 172         # xor remaining bytes from partial register into output
 173         mov             %rcx,%rax
 174         and             $0xf,%rcx
 175         jz              .Ldone8
 176         mov             %rax,%r9
 177         and             $~0xf,%r9
 178 
 179         mov             $1,%rax
 180         shld            %cl,%rax,%rax
 181         sub             $1,%rax
 182         kmovq           %rax,%k1
 183 
 184         vmovdqu8        (%rdx,%r9),%xmm1{%k1}{z}
 185         vpxord          %xmm7,%xmm1,%xmm1
 186         vmovdqu8        %xmm1,(%rsi,%r9){%k1}
 187 
 188         jmp             .Ldone2
 189 
 190 ENDPROC(chacha_2block_xor_avx512vl)
 191 
 192 ENTRY(chacha_4block_xor_avx512vl)
 193         # %rdi: Input state matrix, s
 194         # %rsi: up to 4 data blocks output, o
 195         # %rdx: up to 4 data blocks input, i
 196         # %rcx: input/output length in bytes
 197         # %r8d: nrounds
 198 
 199         # This function encrypts four ChaCha blocks by loading the state
 200         # matrix four times across eight AVX registers. It performs matrix
 201         # operations on four words in two matrices in parallel, sequentially
 202         # to the operations on the four words of the other two matrices. The
 203         # required word shuffling has a rather high latency, we can do the
 204         # arithmetic on two matrix-pairs without much slowdown.
 205 
 206         vzeroupper
 207 
 208         # x0..3[0-4] = s0..3
 209         vbroadcasti128  0x00(%rdi),%ymm0
 210         vbroadcasti128  0x10(%rdi),%ymm1
 211         vbroadcasti128  0x20(%rdi),%ymm2
 212         vbroadcasti128  0x30(%rdi),%ymm3
 213 
 214         vmovdqa         %ymm0,%ymm4
 215         vmovdqa         %ymm1,%ymm5
 216         vmovdqa         %ymm2,%ymm6
 217         vmovdqa         %ymm3,%ymm7
 218 
 219         vpaddd          CTR2BL(%rip),%ymm3,%ymm3
 220         vpaddd          CTR4BL(%rip),%ymm7,%ymm7
 221 
 222         vmovdqa         %ymm0,%ymm11
 223         vmovdqa         %ymm1,%ymm12
 224         vmovdqa         %ymm2,%ymm13
 225         vmovdqa         %ymm3,%ymm14
 226         vmovdqa         %ymm7,%ymm15
 227 
 228 .Ldoubleround4:
 229 
 230         # x0 += x1, x3 = rotl32(x3 ^ x0, 16)
 231         vpaddd          %ymm1,%ymm0,%ymm0
 232         vpxord          %ymm0,%ymm3,%ymm3
 233         vprold          $16,%ymm3,%ymm3
 234 
 235         vpaddd          %ymm5,%ymm4,%ymm4
 236         vpxord          %ymm4,%ymm7,%ymm7
 237         vprold          $16,%ymm7,%ymm7
 238 
 239         # x2 += x3, x1 = rotl32(x1 ^ x2, 12)
 240         vpaddd          %ymm3,%ymm2,%ymm2
 241         vpxord          %ymm2,%ymm1,%ymm1
 242         vprold          $12,%ymm1,%ymm1
 243 
 244         vpaddd          %ymm7,%ymm6,%ymm6
 245         vpxord          %ymm6,%ymm5,%ymm5
 246         vprold          $12,%ymm5,%ymm5
 247 
 248         # x0 += x1, x3 = rotl32(x3 ^ x0, 8)
 249         vpaddd          %ymm1,%ymm0,%ymm0
 250         vpxord          %ymm0,%ymm3,%ymm3
 251         vprold          $8,%ymm3,%ymm3
 252 
 253         vpaddd          %ymm5,%ymm4,%ymm4
 254         vpxord          %ymm4,%ymm7,%ymm7
 255         vprold          $8,%ymm7,%ymm7
 256 
 257         # x2 += x3, x1 = rotl32(x1 ^ x2, 7)
 258         vpaddd          %ymm3,%ymm2,%ymm2
 259         vpxord          %ymm2,%ymm1,%ymm1
 260         vprold          $7,%ymm1,%ymm1
 261 
 262         vpaddd          %ymm7,%ymm6,%ymm6
 263         vpxord          %ymm6,%ymm5,%ymm5
 264         vprold          $7,%ymm5,%ymm5
 265 
 266         # x1 = shuffle32(x1, MASK(0, 3, 2, 1))
 267         vpshufd         $0x39,%ymm1,%ymm1
 268         vpshufd         $0x39,%ymm5,%ymm5
 269         # x2 = shuffle32(x2, MASK(1, 0, 3, 2))
 270         vpshufd         $0x4e,%ymm2,%ymm2
 271         vpshufd         $0x4e,%ymm6,%ymm6
 272         # x3 = shuffle32(x3, MASK(2, 1, 0, 3))
 273         vpshufd         $0x93,%ymm3,%ymm3
 274         vpshufd         $0x93,%ymm7,%ymm7
 275 
 276         # x0 += x1, x3 = rotl32(x3 ^ x0, 16)
 277         vpaddd          %ymm1,%ymm0,%ymm0
 278         vpxord          %ymm0,%ymm3,%ymm3
 279         vprold          $16,%ymm3,%ymm3
 280 
 281         vpaddd          %ymm5,%ymm4,%ymm4
 282         vpxord          %ymm4,%ymm7,%ymm7
 283         vprold          $16,%ymm7,%ymm7
 284 
 285         # x2 += x3, x1 = rotl32(x1 ^ x2, 12)
 286         vpaddd          %ymm3,%ymm2,%ymm2
 287         vpxord          %ymm2,%ymm1,%ymm1
 288         vprold          $12,%ymm1,%ymm1
 289 
 290         vpaddd          %ymm7,%ymm6,%ymm6
 291         vpxord          %ymm6,%ymm5,%ymm5
 292         vprold          $12,%ymm5,%ymm5
 293 
 294         # x0 += x1, x3 = rotl32(x3 ^ x0, 8)
 295         vpaddd          %ymm1,%ymm0,%ymm0
 296         vpxord          %ymm0,%ymm3,%ymm3
 297         vprold          $8,%ymm3,%ymm3
 298 
 299         vpaddd          %ymm5,%ymm4,%ymm4
 300         vpxord          %ymm4,%ymm7,%ymm7
 301         vprold          $8,%ymm7,%ymm7
 302 
 303         # x2 += x3, x1 = rotl32(x1 ^ x2, 7)
 304         vpaddd          %ymm3,%ymm2,%ymm2
 305         vpxord          %ymm2,%ymm1,%ymm1
 306         vprold          $7,%ymm1,%ymm1
 307 
 308         vpaddd          %ymm7,%ymm6,%ymm6
 309         vpxord          %ymm6,%ymm5,%ymm5
 310         vprold          $7,%ymm5,%ymm5
 311 
 312         # x1 = shuffle32(x1, MASK(2, 1, 0, 3))
 313         vpshufd         $0x93,%ymm1,%ymm1
 314         vpshufd         $0x93,%ymm5,%ymm5
 315         # x2 = shuffle32(x2, MASK(1, 0, 3, 2))
 316         vpshufd         $0x4e,%ymm2,%ymm2
 317         vpshufd         $0x4e,%ymm6,%ymm6
 318         # x3 = shuffle32(x3, MASK(0, 3, 2, 1))
 319         vpshufd         $0x39,%ymm3,%ymm3
 320         vpshufd         $0x39,%ymm7,%ymm7
 321 
 322         sub             $2,%r8d
 323         jnz             .Ldoubleround4
 324 
 325         # o0 = i0 ^ (x0 + s0), first block
 326         vpaddd          %ymm11,%ymm0,%ymm10
 327         cmp             $0x10,%rcx
 328         jl              .Lxorpart4
 329         vpxord          0x00(%rdx),%xmm10,%xmm9
 330         vmovdqu         %xmm9,0x00(%rsi)
 331         vextracti128    $1,%ymm10,%xmm0
 332         # o1 = i1 ^ (x1 + s1), first block
 333         vpaddd          %ymm12,%ymm1,%ymm10
 334         cmp             $0x20,%rcx
 335         jl              .Lxorpart4
 336         vpxord          0x10(%rdx),%xmm10,%xmm9
 337         vmovdqu         %xmm9,0x10(%rsi)
 338         vextracti128    $1,%ymm10,%xmm1
 339         # o2 = i2 ^ (x2 + s2), first block
 340         vpaddd          %ymm13,%ymm2,%ymm10
 341         cmp             $0x30,%rcx
 342         jl              .Lxorpart4
 343         vpxord          0x20(%rdx),%xmm10,%xmm9
 344         vmovdqu         %xmm9,0x20(%rsi)
 345         vextracti128    $1,%ymm10,%xmm2
 346         # o3 = i3 ^ (x3 + s3), first block
 347         vpaddd          %ymm14,%ymm3,%ymm10
 348         cmp             $0x40,%rcx
 349         jl              .Lxorpart4
 350         vpxord          0x30(%rdx),%xmm10,%xmm9
 351         vmovdqu         %xmm9,0x30(%rsi)
 352         vextracti128    $1,%ymm10,%xmm3
 353 
 354         # xor and write second block
 355         vmovdqa         %xmm0,%xmm10
 356         cmp             $0x50,%rcx
 357         jl              .Lxorpart4
 358         vpxord          0x40(%rdx),%xmm10,%xmm9
 359         vmovdqu         %xmm9,0x40(%rsi)
 360 
 361         vmovdqa         %xmm1,%xmm10
 362         cmp             $0x60,%rcx
 363         jl              .Lxorpart4
 364         vpxord          0x50(%rdx),%xmm10,%xmm9
 365         vmovdqu         %xmm9,0x50(%rsi)
 366 
 367         vmovdqa         %xmm2,%xmm10
 368         cmp             $0x70,%rcx
 369         jl              .Lxorpart4
 370         vpxord          0x60(%rdx),%xmm10,%xmm9
 371         vmovdqu         %xmm9,0x60(%rsi)
 372 
 373         vmovdqa         %xmm3,%xmm10
 374         cmp             $0x80,%rcx
 375         jl              .Lxorpart4
 376         vpxord          0x70(%rdx),%xmm10,%xmm9
 377         vmovdqu         %xmm9,0x70(%rsi)
 378 
 379         # o0 = i0 ^ (x0 + s0), third block
 380         vpaddd          %ymm11,%ymm4,%ymm10
 381         cmp             $0x90,%rcx
 382         jl              .Lxorpart4
 383         vpxord          0x80(%rdx),%xmm10,%xmm9
 384         vmovdqu         %xmm9,0x80(%rsi)
 385         vextracti128    $1,%ymm10,%xmm4
 386         # o1 = i1 ^ (x1 + s1), third block
 387         vpaddd          %ymm12,%ymm5,%ymm10
 388         cmp             $0xa0,%rcx
 389         jl              .Lxorpart4
 390         vpxord          0x90(%rdx),%xmm10,%xmm9
 391         vmovdqu         %xmm9,0x90(%rsi)
 392         vextracti128    $1,%ymm10,%xmm5
 393         # o2 = i2 ^ (x2 + s2), third block
 394         vpaddd          %ymm13,%ymm6,%ymm10
 395         cmp             $0xb0,%rcx
 396         jl              .Lxorpart4
 397         vpxord          0xa0(%rdx),%xmm10,%xmm9
 398         vmovdqu         %xmm9,0xa0(%rsi)
 399         vextracti128    $1,%ymm10,%xmm6
 400         # o3 = i3 ^ (x3 + s3), third block
 401         vpaddd          %ymm15,%ymm7,%ymm10
 402         cmp             $0xc0,%rcx
 403         jl              .Lxorpart4
 404         vpxord          0xb0(%rdx),%xmm10,%xmm9
 405         vmovdqu         %xmm9,0xb0(%rsi)
 406         vextracti128    $1,%ymm10,%xmm7
 407 
 408         # xor and write fourth block
 409         vmovdqa         %xmm4,%xmm10
 410         cmp             $0xd0,%rcx
 411         jl              .Lxorpart4
 412         vpxord          0xc0(%rdx),%xmm10,%xmm9
 413         vmovdqu         %xmm9,0xc0(%rsi)
 414 
 415         vmovdqa         %xmm5,%xmm10
 416         cmp             $0xe0,%rcx
 417         jl              .Lxorpart4
 418         vpxord          0xd0(%rdx),%xmm10,%xmm9
 419         vmovdqu         %xmm9,0xd0(%rsi)
 420 
 421         vmovdqa         %xmm6,%xmm10
 422         cmp             $0xf0,%rcx
 423         jl              .Lxorpart4
 424         vpxord          0xe0(%rdx),%xmm10,%xmm9
 425         vmovdqu         %xmm9,0xe0(%rsi)
 426 
 427         vmovdqa         %xmm7,%xmm10
 428         cmp             $0x100,%rcx
 429         jl              .Lxorpart4
 430         vpxord          0xf0(%rdx),%xmm10,%xmm9
 431         vmovdqu         %xmm9,0xf0(%rsi)
 432 
 433 .Ldone4:
 434         vzeroupper
 435         ret
 436 
 437 .Lxorpart4:
 438         # xor remaining bytes from partial register into output
 439         mov             %rcx,%rax
 440         and             $0xf,%rcx
 441         jz              .Ldone8
 442         mov             %rax,%r9
 443         and             $~0xf,%r9
 444 
 445         mov             $1,%rax
 446         shld            %cl,%rax,%rax
 447         sub             $1,%rax
 448         kmovq           %rax,%k1
 449 
 450         vmovdqu8        (%rdx,%r9),%xmm1{%k1}{z}
 451         vpxord          %xmm10,%xmm1,%xmm1
 452         vmovdqu8        %xmm1,(%rsi,%r9){%k1}
 453 
 454         jmp             .Ldone4
 455 
 456 ENDPROC(chacha_4block_xor_avx512vl)
 457 
 458 ENTRY(chacha_8block_xor_avx512vl)
 459         # %rdi: Input state matrix, s
 460         # %rsi: up to 8 data blocks output, o
 461         # %rdx: up to 8 data blocks input, i
 462         # %rcx: input/output length in bytes
 463         # %r8d: nrounds
 464 
 465         # This function encrypts eight consecutive ChaCha blocks by loading
 466         # the state matrix in AVX registers eight times. Compared to AVX2, this
 467         # mostly benefits from the new rotate instructions in VL and the
 468         # additional registers.
 469 
 470         vzeroupper
 471 
 472         # x0..15[0-7] = s[0..15]
 473         vpbroadcastd    0x00(%rdi),%ymm0
 474         vpbroadcastd    0x04(%rdi),%ymm1
 475         vpbroadcastd    0x08(%rdi),%ymm2
 476         vpbroadcastd    0x0c(%rdi),%ymm3
 477         vpbroadcastd    0x10(%rdi),%ymm4
 478         vpbroadcastd    0x14(%rdi),%ymm5
 479         vpbroadcastd    0x18(%rdi),%ymm6
 480         vpbroadcastd    0x1c(%rdi),%ymm7
 481         vpbroadcastd    0x20(%rdi),%ymm8
 482         vpbroadcastd    0x24(%rdi),%ymm9
 483         vpbroadcastd    0x28(%rdi),%ymm10
 484         vpbroadcastd    0x2c(%rdi),%ymm11
 485         vpbroadcastd    0x30(%rdi),%ymm12
 486         vpbroadcastd    0x34(%rdi),%ymm13
 487         vpbroadcastd    0x38(%rdi),%ymm14
 488         vpbroadcastd    0x3c(%rdi),%ymm15
 489 
 490         # x12 += counter values 0-3
 491         vpaddd          CTR8BL(%rip),%ymm12,%ymm12
 492 
 493         vmovdqa64       %ymm0,%ymm16
 494         vmovdqa64       %ymm1,%ymm17
 495         vmovdqa64       %ymm2,%ymm18
 496         vmovdqa64       %ymm3,%ymm19
 497         vmovdqa64       %ymm4,%ymm20
 498         vmovdqa64       %ymm5,%ymm21
 499         vmovdqa64       %ymm6,%ymm22
 500         vmovdqa64       %ymm7,%ymm23
 501         vmovdqa64       %ymm8,%ymm24
 502         vmovdqa64       %ymm9,%ymm25
 503         vmovdqa64       %ymm10,%ymm26
 504         vmovdqa64       %ymm11,%ymm27
 505         vmovdqa64       %ymm12,%ymm28
 506         vmovdqa64       %ymm13,%ymm29
 507         vmovdqa64       %ymm14,%ymm30
 508         vmovdqa64       %ymm15,%ymm31
 509 
 510 .Ldoubleround8:
 511         # x0 += x4, x12 = rotl32(x12 ^ x0, 16)
 512         vpaddd          %ymm0,%ymm4,%ymm0
 513         vpxord          %ymm0,%ymm12,%ymm12
 514         vprold          $16,%ymm12,%ymm12
 515         # x1 += x5, x13 = rotl32(x13 ^ x1, 16)
 516         vpaddd          %ymm1,%ymm5,%ymm1
 517         vpxord          %ymm1,%ymm13,%ymm13
 518         vprold          $16,%ymm13,%ymm13
 519         # x2 += x6, x14 = rotl32(x14 ^ x2, 16)
 520         vpaddd          %ymm2,%ymm6,%ymm2
 521         vpxord          %ymm2,%ymm14,%ymm14
 522         vprold          $16,%ymm14,%ymm14
 523         # x3 += x7, x15 = rotl32(x15 ^ x3, 16)
 524         vpaddd          %ymm3,%ymm7,%ymm3
 525         vpxord          %ymm3,%ymm15,%ymm15
 526         vprold          $16,%ymm15,%ymm15
 527 
 528         # x8 += x12, x4 = rotl32(x4 ^ x8, 12)
 529         vpaddd          %ymm12,%ymm8,%ymm8
 530         vpxord          %ymm8,%ymm4,%ymm4
 531         vprold          $12,%ymm4,%ymm4
 532         # x9 += x13, x5 = rotl32(x5 ^ x9, 12)
 533         vpaddd          %ymm13,%ymm9,%ymm9
 534         vpxord          %ymm9,%ymm5,%ymm5
 535         vprold          $12,%ymm5,%ymm5
 536         # x10 += x14, x6 = rotl32(x6 ^ x10, 12)
 537         vpaddd          %ymm14,%ymm10,%ymm10
 538         vpxord          %ymm10,%ymm6,%ymm6
 539         vprold          $12,%ymm6,%ymm6
 540         # x11 += x15, x7 = rotl32(x7 ^ x11, 12)
 541         vpaddd          %ymm15,%ymm11,%ymm11
 542         vpxord          %ymm11,%ymm7,%ymm7
 543         vprold          $12,%ymm7,%ymm7
 544 
 545         # x0 += x4, x12 = rotl32(x12 ^ x0, 8)
 546         vpaddd          %ymm0,%ymm4,%ymm0
 547         vpxord          %ymm0,%ymm12,%ymm12
 548         vprold          $8,%ymm12,%ymm12
 549         # x1 += x5, x13 = rotl32(x13 ^ x1, 8)
 550         vpaddd          %ymm1,%ymm5,%ymm1
 551         vpxord          %ymm1,%ymm13,%ymm13
 552         vprold          $8,%ymm13,%ymm13
 553         # x2 += x6, x14 = rotl32(x14 ^ x2, 8)
 554         vpaddd          %ymm2,%ymm6,%ymm2
 555         vpxord          %ymm2,%ymm14,%ymm14
 556         vprold          $8,%ymm14,%ymm14
 557         # x3 += x7, x15 = rotl32(x15 ^ x3, 8)
 558         vpaddd          %ymm3,%ymm7,%ymm3
 559         vpxord          %ymm3,%ymm15,%ymm15
 560         vprold          $8,%ymm15,%ymm15
 561 
 562         # x8 += x12, x4 = rotl32(x4 ^ x8, 7)
 563         vpaddd          %ymm12,%ymm8,%ymm8
 564         vpxord          %ymm8,%ymm4,%ymm4
 565         vprold          $7,%ymm4,%ymm4
 566         # x9 += x13, x5 = rotl32(x5 ^ x9, 7)
 567         vpaddd          %ymm13,%ymm9,%ymm9
 568         vpxord          %ymm9,%ymm5,%ymm5
 569         vprold          $7,%ymm5,%ymm5
 570         # x10 += x14, x6 = rotl32(x6 ^ x10, 7)
 571         vpaddd          %ymm14,%ymm10,%ymm10
 572         vpxord          %ymm10,%ymm6,%ymm6
 573         vprold          $7,%ymm6,%ymm6
 574         # x11 += x15, x7 = rotl32(x7 ^ x11, 7)
 575         vpaddd          %ymm15,%ymm11,%ymm11
 576         vpxord          %ymm11,%ymm7,%ymm7
 577         vprold          $7,%ymm7,%ymm7
 578 
 579         # x0 += x5, x15 = rotl32(x15 ^ x0, 16)
 580         vpaddd          %ymm0,%ymm5,%ymm0
 581         vpxord          %ymm0,%ymm15,%ymm15
 582         vprold          $16,%ymm15,%ymm15
 583         # x1 += x6, x12 = rotl32(x12 ^ x1, 16)
 584         vpaddd          %ymm1,%ymm6,%ymm1
 585         vpxord          %ymm1,%ymm12,%ymm12
 586         vprold          $16,%ymm12,%ymm12
 587         # x2 += x7, x13 = rotl32(x13 ^ x2, 16)
 588         vpaddd          %ymm2,%ymm7,%ymm2
 589         vpxord          %ymm2,%ymm13,%ymm13
 590         vprold          $16,%ymm13,%ymm13
 591         # x3 += x4, x14 = rotl32(x14 ^ x3, 16)
 592         vpaddd          %ymm3,%ymm4,%ymm3
 593         vpxord          %ymm3,%ymm14,%ymm14
 594         vprold          $16,%ymm14,%ymm14
 595 
 596         # x10 += x15, x5 = rotl32(x5 ^ x10, 12)
 597         vpaddd          %ymm15,%ymm10,%ymm10
 598         vpxord          %ymm10,%ymm5,%ymm5
 599         vprold          $12,%ymm5,%ymm5
 600         # x11 += x12, x6 = rotl32(x6 ^ x11, 12)
 601         vpaddd          %ymm12,%ymm11,%ymm11
 602         vpxord          %ymm11,%ymm6,%ymm6
 603         vprold          $12,%ymm6,%ymm6
 604         # x8 += x13, x7 = rotl32(x7 ^ x8, 12)
 605         vpaddd          %ymm13,%ymm8,%ymm8
 606         vpxord          %ymm8,%ymm7,%ymm7
 607         vprold          $12,%ymm7,%ymm7
 608         # x9 += x14, x4 = rotl32(x4 ^ x9, 12)
 609         vpaddd          %ymm14,%ymm9,%ymm9
 610         vpxord          %ymm9,%ymm4,%ymm4
 611         vprold          $12,%ymm4,%ymm4
 612 
 613         # x0 += x5, x15 = rotl32(x15 ^ x0, 8)
 614         vpaddd          %ymm0,%ymm5,%ymm0
 615         vpxord          %ymm0,%ymm15,%ymm15
 616         vprold          $8,%ymm15,%ymm15
 617         # x1 += x6, x12 = rotl32(x12 ^ x1, 8)
 618         vpaddd          %ymm1,%ymm6,%ymm1
 619         vpxord          %ymm1,%ymm12,%ymm12
 620         vprold          $8,%ymm12,%ymm12
 621         # x2 += x7, x13 = rotl32(x13 ^ x2, 8)
 622         vpaddd          %ymm2,%ymm7,%ymm2
 623         vpxord          %ymm2,%ymm13,%ymm13
 624         vprold          $8,%ymm13,%ymm13
 625         # x3 += x4, x14 = rotl32(x14 ^ x3, 8)
 626         vpaddd          %ymm3,%ymm4,%ymm3
 627         vpxord          %ymm3,%ymm14,%ymm14
 628         vprold          $8,%ymm14,%ymm14
 629 
 630         # x10 += x15, x5 = rotl32(x5 ^ x10, 7)
 631         vpaddd          %ymm15,%ymm10,%ymm10
 632         vpxord          %ymm10,%ymm5,%ymm5
 633         vprold          $7,%ymm5,%ymm5
 634         # x11 += x12, x6 = rotl32(x6 ^ x11, 7)
 635         vpaddd          %ymm12,%ymm11,%ymm11
 636         vpxord          %ymm11,%ymm6,%ymm6
 637         vprold          $7,%ymm6,%ymm6
 638         # x8 += x13, x7 = rotl32(x7 ^ x8, 7)
 639         vpaddd          %ymm13,%ymm8,%ymm8
 640         vpxord          %ymm8,%ymm7,%ymm7
 641         vprold          $7,%ymm7,%ymm7
 642         # x9 += x14, x4 = rotl32(x4 ^ x9, 7)
 643         vpaddd          %ymm14,%ymm9,%ymm9
 644         vpxord          %ymm9,%ymm4,%ymm4
 645         vprold          $7,%ymm4,%ymm4
 646 
 647         sub             $2,%r8d
 648         jnz             .Ldoubleround8
 649 
 650         # x0..15[0-3] += s[0..15]
 651         vpaddd          %ymm16,%ymm0,%ymm0
 652         vpaddd          %ymm17,%ymm1,%ymm1
 653         vpaddd          %ymm18,%ymm2,%ymm2
 654         vpaddd          %ymm19,%ymm3,%ymm3
 655         vpaddd          %ymm20,%ymm4,%ymm4
 656         vpaddd          %ymm21,%ymm5,%ymm5
 657         vpaddd          %ymm22,%ymm6,%ymm6
 658         vpaddd          %ymm23,%ymm7,%ymm7
 659         vpaddd          %ymm24,%ymm8,%ymm8
 660         vpaddd          %ymm25,%ymm9,%ymm9
 661         vpaddd          %ymm26,%ymm10,%ymm10
 662         vpaddd          %ymm27,%ymm11,%ymm11
 663         vpaddd          %ymm28,%ymm12,%ymm12
 664         vpaddd          %ymm29,%ymm13,%ymm13
 665         vpaddd          %ymm30,%ymm14,%ymm14
 666         vpaddd          %ymm31,%ymm15,%ymm15
 667 
 668         # interleave 32-bit words in state n, n+1
 669         vpunpckldq      %ymm1,%ymm0,%ymm16
 670         vpunpckhdq      %ymm1,%ymm0,%ymm17
 671         vpunpckldq      %ymm3,%ymm2,%ymm18
 672         vpunpckhdq      %ymm3,%ymm2,%ymm19
 673         vpunpckldq      %ymm5,%ymm4,%ymm20
 674         vpunpckhdq      %ymm5,%ymm4,%ymm21
 675         vpunpckldq      %ymm7,%ymm6,%ymm22
 676         vpunpckhdq      %ymm7,%ymm6,%ymm23
 677         vpunpckldq      %ymm9,%ymm8,%ymm24
 678         vpunpckhdq      %ymm9,%ymm8,%ymm25
 679         vpunpckldq      %ymm11,%ymm10,%ymm26
 680         vpunpckhdq      %ymm11,%ymm10,%ymm27
 681         vpunpckldq      %ymm13,%ymm12,%ymm28
 682         vpunpckhdq      %ymm13,%ymm12,%ymm29
 683         vpunpckldq      %ymm15,%ymm14,%ymm30
 684         vpunpckhdq      %ymm15,%ymm14,%ymm31
 685 
 686         # interleave 64-bit words in state n, n+2
 687         vpunpcklqdq     %ymm18,%ymm16,%ymm0
 688         vpunpcklqdq     %ymm19,%ymm17,%ymm1
 689         vpunpckhqdq     %ymm18,%ymm16,%ymm2
 690         vpunpckhqdq     %ymm19,%ymm17,%ymm3
 691         vpunpcklqdq     %ymm22,%ymm20,%ymm4
 692         vpunpcklqdq     %ymm23,%ymm21,%ymm5
 693         vpunpckhqdq     %ymm22,%ymm20,%ymm6
 694         vpunpckhqdq     %ymm23,%ymm21,%ymm7
 695         vpunpcklqdq     %ymm26,%ymm24,%ymm8
 696         vpunpcklqdq     %ymm27,%ymm25,%ymm9
 697         vpunpckhqdq     %ymm26,%ymm24,%ymm10
 698         vpunpckhqdq     %ymm27,%ymm25,%ymm11
 699         vpunpcklqdq     %ymm30,%ymm28,%ymm12
 700         vpunpcklqdq     %ymm31,%ymm29,%ymm13
 701         vpunpckhqdq     %ymm30,%ymm28,%ymm14
 702         vpunpckhqdq     %ymm31,%ymm29,%ymm15
 703 
 704         # interleave 128-bit words in state n, n+4
 705         # xor/write first four blocks
 706         vmovdqa64       %ymm0,%ymm16
 707         vperm2i128      $0x20,%ymm4,%ymm0,%ymm0
 708         cmp             $0x0020,%rcx
 709         jl              .Lxorpart8
 710         vpxord          0x0000(%rdx),%ymm0,%ymm0
 711         vmovdqu64       %ymm0,0x0000(%rsi)
 712         vmovdqa64       %ymm16,%ymm0
 713         vperm2i128      $0x31,%ymm4,%ymm0,%ymm4
 714 
 715         vperm2i128      $0x20,%ymm12,%ymm8,%ymm0
 716         cmp             $0x0040,%rcx
 717         jl              .Lxorpart8
 718         vpxord          0x0020(%rdx),%ymm0,%ymm0
 719         vmovdqu64       %ymm0,0x0020(%rsi)
 720         vperm2i128      $0x31,%ymm12,%ymm8,%ymm12
 721 
 722         vperm2i128      $0x20,%ymm6,%ymm2,%ymm0
 723         cmp             $0x0060,%rcx
 724         jl              .Lxorpart8
 725         vpxord          0x0040(%rdx),%ymm0,%ymm0
 726         vmovdqu64       %ymm0,0x0040(%rsi)
 727         vperm2i128      $0x31,%ymm6,%ymm2,%ymm6
 728 
 729         vperm2i128      $0x20,%ymm14,%ymm10,%ymm0
 730         cmp             $0x0080,%rcx
 731         jl              .Lxorpart8
 732         vpxord          0x0060(%rdx),%ymm0,%ymm0
 733         vmovdqu64       %ymm0,0x0060(%rsi)
 734         vperm2i128      $0x31,%ymm14,%ymm10,%ymm14
 735 
 736         vperm2i128      $0x20,%ymm5,%ymm1,%ymm0
 737         cmp             $0x00a0,%rcx
 738         jl              .Lxorpart8
 739         vpxord          0x0080(%rdx),%ymm0,%ymm0
 740         vmovdqu64       %ymm0,0x0080(%rsi)
 741         vperm2i128      $0x31,%ymm5,%ymm1,%ymm5
 742 
 743         vperm2i128      $0x20,%ymm13,%ymm9,%ymm0
 744         cmp             $0x00c0,%rcx
 745         jl              .Lxorpart8
 746         vpxord          0x00a0(%rdx),%ymm0,%ymm0
 747         vmovdqu64       %ymm0,0x00a0(%rsi)
 748         vperm2i128      $0x31,%ymm13,%ymm9,%ymm13
 749 
 750         vperm2i128      $0x20,%ymm7,%ymm3,%ymm0
 751         cmp             $0x00e0,%rcx
 752         jl              .Lxorpart8
 753         vpxord          0x00c0(%rdx),%ymm0,%ymm0
 754         vmovdqu64       %ymm0,0x00c0(%rsi)
 755         vperm2i128      $0x31,%ymm7,%ymm3,%ymm7
 756 
 757         vperm2i128      $0x20,%ymm15,%ymm11,%ymm0
 758         cmp             $0x0100,%rcx
 759         jl              .Lxorpart8
 760         vpxord          0x00e0(%rdx),%ymm0,%ymm0
 761         vmovdqu64       %ymm0,0x00e0(%rsi)
 762         vperm2i128      $0x31,%ymm15,%ymm11,%ymm15
 763 
 764         # xor remaining blocks, write to output
 765         vmovdqa64       %ymm4,%ymm0
 766         cmp             $0x0120,%rcx
 767         jl              .Lxorpart8
 768         vpxord          0x0100(%rdx),%ymm0,%ymm0
 769         vmovdqu64       %ymm0,0x0100(%rsi)
 770 
 771         vmovdqa64       %ymm12,%ymm0
 772         cmp             $0x0140,%rcx
 773         jl              .Lxorpart8
 774         vpxord          0x0120(%rdx),%ymm0,%ymm0
 775         vmovdqu64       %ymm0,0x0120(%rsi)
 776 
 777         vmovdqa64       %ymm6,%ymm0
 778         cmp             $0x0160,%rcx
 779         jl              .Lxorpart8
 780         vpxord          0x0140(%rdx),%ymm0,%ymm0
 781         vmovdqu64       %ymm0,0x0140(%rsi)
 782 
 783         vmovdqa64       %ymm14,%ymm0
 784         cmp             $0x0180,%rcx
 785         jl              .Lxorpart8
 786         vpxord          0x0160(%rdx),%ymm0,%ymm0
 787         vmovdqu64       %ymm0,0x0160(%rsi)
 788 
 789         vmovdqa64       %ymm5,%ymm0
 790         cmp             $0x01a0,%rcx
 791         jl              .Lxorpart8
 792         vpxord          0x0180(%rdx),%ymm0,%ymm0
 793         vmovdqu64       %ymm0,0x0180(%rsi)
 794 
 795         vmovdqa64       %ymm13,%ymm0
 796         cmp             $0x01c0,%rcx
 797         jl              .Lxorpart8
 798         vpxord          0x01a0(%rdx),%ymm0,%ymm0
 799         vmovdqu64       %ymm0,0x01a0(%rsi)
 800 
 801         vmovdqa64       %ymm7,%ymm0
 802         cmp             $0x01e0,%rcx
 803         jl              .Lxorpart8
 804         vpxord          0x01c0(%rdx),%ymm0,%ymm0
 805         vmovdqu64       %ymm0,0x01c0(%rsi)
 806 
 807         vmovdqa64       %ymm15,%ymm0
 808         cmp             $0x0200,%rcx
 809         jl              .Lxorpart8
 810         vpxord          0x01e0(%rdx),%ymm0,%ymm0
 811         vmovdqu64       %ymm0,0x01e0(%rsi)
 812 
 813 .Ldone8:
 814         vzeroupper
 815         ret
 816 
 817 .Lxorpart8:
 818         # xor remaining bytes from partial register into output
 819         mov             %rcx,%rax
 820         and             $0x1f,%rcx
 821         jz              .Ldone8
 822         mov             %rax,%r9
 823         and             $~0x1f,%r9
 824 
 825         mov             $1,%rax
 826         shld            %cl,%rax,%rax
 827         sub             $1,%rax
 828         kmovq           %rax,%k1
 829 
 830         vmovdqu8        (%rdx,%r9),%ymm1{%k1}{z}
 831         vpxord          %ymm0,%ymm1,%ymm1
 832         vmovdqu8        %ymm1,(%rsi,%r9){%k1}
 833 
 834         jmp             .Ldone8
 835 
 836 ENDPROC(chacha_8block_xor_avx512vl)