crypto/ec/asm/ecp_nistz256-x86.pl

   1 #!/usr/bin/env perl
   2
   3 # ====================================================================
   4 # Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
   5 # project. The module is, however, dual licensed under OpenSSL and
   6 # CRYPTOGAMS licenses depending on where you obtain it. For further
   7 # details see http://www.openssl.org/~appro/cryptogams/.
   8 # ====================================================================
   9 #
  10 # ECP_NISTZ256 module for x86/SSE2.
  11 #
  12 # October 2014.
  13 #
  14 # Original ECP_NISTZ256 submission targeting x86_64 is detailed in
  15 # http://eprint.iacr.org/2013/816. In the process of adaptation
  16 # original .c module was made 32-bit savvy in order to make this
  17 # implementation possible.
  18 #
  19 #               with/without -DECP_NISTZ256_ASM
  20 # Pentium       +66-163%
  21 # PIII          +72-172%
  22 # P4            +65-132%
  23 # Core2         +90-215%
  24 # Sandy Bridge  +105-265% (contemporary i[57]-* are all close to this)
  25 # Atom          +65-155%
  26 # Opteron       +54-110%
  27 # Bulldozer     +99-240%
  28 # VIA Nano      +93-290%
  29 #
  30 # Ranges denote minimum and maximum improvement coefficients depending
  31 # on benchmark. Lower coefficients are for ECDSA sign, server-side
  32 # operation. Keep in mind that +200% means 3x improvement.
  33
  34 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
  35 push(@INC,"${dir}","${dir}../../perlasm");
  36 require "x86asm.pl";
  37
  38 &asm_init($ARGV[0],"ecp_nistz256-x86.pl",$ARGV[$#ARGV] eq "386");
  39
  40 $sse2=0;
  41 for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
  42
  43 &external_label("OPENSSL_ia32cap_P") if ($sse2);
  44
  45
  46 ########################################################################
  47 # Convert ecp_nistz256_table.c to layout expected by ecp_nistz_gather_w7
  48 #
  49 open TABLE,"<ecp_nistz256_table.c"              or
  50 open TABLE,"<${dir}../ecp_nistz256_table.c"     or
  51 die "failed to open ecp_nistz256_table.c:",$!;
  52
  53 use integer;
  54
  55 foreach(<TABLE>) {
  56         s/TOBN\(\s*(0x[0-9a-f]+),\s*(0x[0-9a-f]+)\s*\)/push @arr,hex($2),hex($1)/geo;
  57 }
  58 close TABLE;
  59
  60 # See ecp_nistz256_table.c for explanation for why it's 64*16*37.
  61 # 64*16*37-1 is because $#arr returns last valid index or @arr, not
  62 # amount of elements.
  63 die "insane number of elements" if ($#arr != 64*16*37-1);
  64
  65 &public_label("ecp_nistz256_precomputed");
  66 &align(4096);
  67 &set_label("ecp_nistz256_precomputed");
  68
  69 ########################################################################
  70 # this conversion smashes P256_POINT_AFFINE by individual bytes with
  71 # 64 byte interval, similar to
  72 #       1111222233334444
  73 #       1234123412341234
  74 for(1..37) {
  75         @tbl = splice(@arr,0,64*16);
  76         for($i=0;$i<64;$i++) {
  77                 undef @line;
  78                 for($j=0;$j<64;$j++) {
  79                         push @line,(@tbl[$j*16+$i/4]>>(($i%4)*8))&0xff;
  80                 }
  81                 &data_byte(join(',',map { sprintf "0x%02x",$_} @line));
  82         }
  83 }
  84
  85 ########################################################################
  86 # Keep in mind that constants are stored least to most significant word
  87 &static_label("RR");
  88 &set_label("RR",64);
  89 &data_word(3,0,-1,-5,-2,-1,-3,4);       # 2^512 mod P-256
  90
  91 &static_label("ONE_mont");
  92 &set_label("ONE_mont");
  93 &data_word(1,0,0,-1,-1,-1,-2,0);
  94
  95 &static_label("ONE");
  96 &set_label("ONE");
  97 &data_word(1,0,0,0,0,0,0,0);
  98 &asciz("ECP_NISZ256 for x86/SSE2, CRYPTOGAMS by <appro\@openssl.org>");
  99 &align(64);
 100
 101 ########################################################################
 102 # void ecp_nistz256_mul_by_2(BN_ULONG edi[8],const BN_ULONG esi[8]);
 103 &function_begin("ecp_nistz256_mul_by_2");
 104         &mov    ("esi",&wparam(1));
 105         &mov    ("edi",&wparam(0));
 106         &mov    ("ebp","esi");
 107 ########################################################################
 108 # common pattern for internal functions is that %edi is result pointer,
 109 # %esi and %ebp are input ones, %ebp being optional. %edi is preserved.
 110         &call   ("_ecp_nistz256_add");
 111 &function_end("ecp_nistz256_mul_by_2");
 112
 113 ########################################################################
 114 # void ecp_nistz256_mul_by_3(BN_ULONG edi[8],const BN_ULONG esi[8]);
 115 &function_begin("ecp_nistz256_mul_by_3");
 116         &mov    ("esi",&wparam(1));
 117                                         # multiplication by 3 is performed
 118                                         # as 2*n+n, but we can't use output
 119                                         # to store 2*n, because if output
 120                                         # pointer equals to input, then
 121                                         # we'll get 2*n+2*n.
 122         &stack_push(8);                 # therefore we need to allocate
 123                                         # 256-bit intermediate buffer.
 124         &mov    ("edi","esp");
 125         &mov    ("ebp","esi");
 126         &call   ("_ecp_nistz256_add");
 127         &lea    ("esi",&DWP(0,"edi"));
 128         &mov    ("ebp",&wparam(1));
 129         &mov    ("edi",&wparam(0));
 130         &call   ("_ecp_nistz256_add");
 131         &stack_pop(8);
 132 &function_end("ecp_nistz256_mul_by_3");
 133
 134 ########################################################################
 135 # void ecp_nistz256_div_by_2(BN_ULONG edi[8],const BN_ULONG esi[8]);
 136 &function_begin("ecp_nistz256_div_by_2");
 137         &mov    ("esi",&wparam(1));
 138         &mov    ("edi",&wparam(0));
 139         &call   ("_ecp_nistz256_div_by_2");
 140 &function_end("ecp_nistz256_div_by_2");
 141
 142 &function_begin_B("_ecp_nistz256_div_by_2");
 143         # tmp = a is odd ? a+mod : a
 144         #
 145         # note that because mod has special form, i.e. consists of
 146         # 0xffffffff, 1 and 0s, we can conditionally synthesize it by
 147         # assigning least significant bit of input to one register,
 148         # %ebp, and its negative to another, %edx.
 149
 150         &mov    ("ebp",&DWP(0,"esi"));
 151         &xor    ("edx","edx");
 152         &mov    ("ebx",&DWP(4,"esi"));
 153         &mov    ("eax","ebp");
 154         &and    ("ebp",1);
 155         &mov    ("ecx",&DWP(8,"esi"));
 156         &sub    ("edx","ebp");
 157
 158         &add    ("eax","edx");
 159         &adc    ("ebx","edx");
 160         &mov    (&DWP(0,"edi"),"eax");
 161         &adc    ("ecx","edx");
 162         &mov    (&DWP(4,"edi"),"ebx");
 163         &mov    (&DWP(8,"edi"),"ecx");
 164
 165         &mov    ("eax",&DWP(12,"esi"));
 166         &mov    ("ebx",&DWP(16,"esi"));
 167         &adc    ("eax",0);
 168         &mov    ("ecx",&DWP(20,"esi"));
 169         &adc    ("ebx",0);
 170         &mov    (&DWP(12,"edi"),"eax");
 171         &adc    ("ecx",0);
 172         &mov    (&DWP(16,"edi"),"ebx");
 173         &mov    (&DWP(20,"edi"),"ecx");
 174
 175         &mov    ("eax",&DWP(24,"esi"));
 176         &mov    ("ebx",&DWP(28,"esi"));
 177         &adc    ("eax","ebp");
 178         &adc    ("ebx","edx");
 179         &mov    (&DWP(24,"edi"),"eax");
 180         &sbb    ("esi","esi");                  # broadcast carry bit
 181         &mov    (&DWP(28,"edi"),"ebx");
 182
 183         # ret = tmp >> 1
 184
 185         &mov    ("eax",&DWP(0,"edi"));
 186         &mov    ("ebx",&DWP(4,"edi"));
 187         &mov    ("ecx",&DWP(8,"edi"));
 188         &mov    ("edx",&DWP(12,"edi"));
 189
 190         &shr    ("eax",1);
 191         &mov    ("ebp","ebx");
 192         &shl    ("ebx",31);
 193         &or     ("eax","ebx");
 194
 195         &shr    ("ebp",1);
 196         &mov    ("ebx","ecx");
 197         &shl    ("ecx",31);
 198         &mov    (&DWP(0,"edi"),"eax");
 199         &or     ("ebp","ecx");
 200         &mov    ("eax",&DWP(16,"edi"));
 201
 202         &shr    ("ebx",1);
 203         &mov    ("ecx","edx");
 204         &shl    ("edx",31);
 205         &mov    (&DWP(4,"edi"),"ebp");
 206         &or     ("ebx","edx");
 207         &mov    ("ebp",&DWP(20,"edi"));
 208
 209         &shr    ("ecx",1);
 210         &mov    ("edx","eax");
 211         &shl    ("eax",31);
 212         &mov    (&DWP(8,"edi"),"ebx");
 213         &or     ("ecx","eax");
 214         &mov    ("ebx",&DWP(24,"edi"));
 215
 216         &shr    ("edx",1);
 217         &mov    ("eax","ebp");
 218         &shl    ("ebp",31);
 219         &mov    (&DWP(12,"edi"),"ecx");
 220         &or     ("edx","ebp");
 221         &mov    ("ecx",&DWP(28,"edi"));
 222
 223         &shr    ("eax",1);
 224         &mov    ("ebp","ebx");
 225         &shl    ("ebx",31);
 226         &mov    (&DWP(16,"edi"),"edx");
 227         &or     ("eax","ebx");
 228
 229         &shr    ("ebp",1);
 230         &mov    ("ebx","ecx");
 231         &shl    ("ecx",31);
 232         &mov    (&DWP(20,"edi"),"eax");
 233         &or     ("ebp","ecx");
 234
 235         &shr    ("ebx",1);
 236         &shl    ("esi",31);
 237         &mov    (&DWP(24,"edi"),"ebp");
 238         &or     ("ebx","esi");                  # handle top-most carry bit
 239         &mov    (&DWP(28,"edi"),"ebx");
 240
 241         &ret    ();
 242 &function_end_B("_ecp_nistz256_div_by_2");
 243
 244 ########################################################################
 245 # void ecp_nistz256_add(BN_ULONG edi[8],const BN_ULONG esi[8],
 246 #                                       const BN_ULONG ebp[8]);
 247 &function_begin("ecp_nistz256_add");
 248         &mov    ("esi",&wparam(1));
 249         &mov    ("ebp",&wparam(2));
 250         &mov    ("edi",&wparam(0));
 251         &call   ("_ecp_nistz256_add");
 252 &function_end("ecp_nistz256_add");
 253
 254 &function_begin_B("_ecp_nistz256_add");
 255         &mov    ("eax",&DWP(0,"esi"));
 256         &mov    ("ebx",&DWP(4,"esi"));
 257         &mov    ("ecx",&DWP(8,"esi"));
 258         &add    ("eax",&DWP(0,"ebp"));
 259         &mov    ("edx",&DWP(12,"esi"));
 260         &adc    ("ebx",&DWP(4,"ebp"));
 261         &mov    (&DWP(0,"edi"),"eax");
 262         &adc    ("ecx",&DWP(8,"ebp"));
 263         &mov    (&DWP(4,"edi"),"ebx");
 264         &adc    ("edx",&DWP(12,"ebp"));
 265         &mov    (&DWP(8,"edi"),"ecx");
 266         &mov    (&DWP(12,"edi"),"edx");
 267
 268         &mov    ("eax",&DWP(16,"esi"));
 269         &mov    ("ebx",&DWP(20,"esi"));
 270         &mov    ("ecx",&DWP(24,"esi"));
 271         &adc    ("eax",&DWP(16,"ebp"));
 272         &mov    ("edx",&DWP(28,"esi"));
 273         &adc    ("ebx",&DWP(20,"ebp"));
 274         &mov    (&DWP(16,"edi"),"eax");
 275         &adc    ("ecx",&DWP(24,"ebp"));
 276         &mov    (&DWP(20,"edi"),"ebx");
 277         &adc    ("edx",&DWP(28,"ebp"));
 278         &mov    (&DWP(24,"edi"),"ecx");
 279         &sbb    ("esi","esi");                  # broadcast carry bit
 280         &mov    (&DWP(28,"edi"),"edx");
 281
 282         # if a+b carries, subtract modulus.
 283         #
 284         # Note that because mod has special form, i.e. consists of
 285         # 0xffffffff, 1 and 0s, we can conditionally synthesize it by
 286         # assigning carry bit to one register, %ebp, and its negative
 287         # to another, %esi. But we started by calculating %esi...
 288
 289         &mov    ("eax",&DWP(0,"edi"));
 290         &mov    ("ebp","esi");
 291         &mov    ("ebx",&DWP(4,"edi"));
 292         &shr    ("ebp",31);
 293         &mov    ("ecx",&DWP(8,"edi"));
 294         &sub    ("eax","esi");
 295         &mov    ("edx",&DWP(12,"edi"));
 296         &sbb    ("ebx","esi");
 297         &mov    (&DWP(0,"edi"),"eax");
 298         &sbb    ("ecx","esi");
 299         &mov    (&DWP(4,"edi"),"ebx");
 300         &sbb    ("edx",0);
 301         &mov    (&DWP(8,"edi"),"ecx");
 302         &mov    (&DWP(12,"edi"),"edx");
 303
 304         &mov    ("eax",&DWP(16,"edi"));
 305         &mov    ("ebx",&DWP(20,"edi"));
 306         &mov    ("ecx",&DWP(24,"edi"));
 307         &sbb    ("eax",0);
 308         &mov    ("edx",&DWP(28,"edi"));
 309         &sbb    ("ebx",0);
 310         &mov    (&DWP(16,"edi"),"eax");
 311         &sbb    ("ecx","ebp");
 312         &mov    (&DWP(20,"edi"),"ebx");
 313         &sbb    ("edx","esi");
 314         &mov    (&DWP(24,"edi"),"ecx");
 315         &mov    (&DWP(28,"edi"),"edx");
 316
 317         &ret    ();
 318 &function_end_B("_ecp_nistz256_add");
 319
 320 ########################################################################
 321 # void ecp_nistz256_sub(BN_ULONG edi[8],const BN_ULONG esi[8],
 322 #                                       const BN_ULONG ebp[8]);
 323 &function_begin("ecp_nistz256_sub");
 324         &mov    ("esi",&wparam(1));
 325         &mov    ("ebp",&wparam(2));
 326         &mov    ("edi",&wparam(0));
 327         &call   ("_ecp_nistz256_sub");
 328 &function_end("ecp_nistz256_sub");
 329
 330 &function_begin_B("_ecp_nistz256_sub");
 331         &mov    ("eax",&DWP(0,"esi"));
 332         &mov    ("ebx",&DWP(4,"esi"));
 333         &mov    ("ecx",&DWP(8,"esi"));
 334         &sub    ("eax",&DWP(0,"ebp"));
 335         &mov    ("edx",&DWP(12,"esi"));
 336         &sbb    ("ebx",&DWP(4,"ebp"));
 337         &mov    (&DWP(0,"edi"),"eax");
 338         &sbb    ("ecx",&DWP(8,"ebp"));
 339         &mov    (&DWP(4,"edi"),"ebx");
 340         &sbb    ("edx",&DWP(12,"ebp"));
 341         &mov    (&DWP(8,"edi"),"ecx");
 342         &mov    (&DWP(12,"edi"),"edx");
 343
 344         &mov    ("eax",&DWP(16,"esi"));
 345         &mov    ("ebx",&DWP(20,"esi"));
 346         &mov    ("ecx",&DWP(24,"esi"));
 347         &sbb    ("eax",&DWP(16,"ebp"));
 348         &mov    ("edx",&DWP(28,"esi"));
 349         &sbb    ("ebx",&DWP(20,"ebp"));
 350         &sbb    ("ecx",&DWP(24,"ebp"));
 351         &mov    (&DWP(16,"edi"),"eax");
 352         &sbb    ("edx",&DWP(28,"ebp"));
 353         &mov    (&DWP(20,"edi"),"ebx");
 354         &sbb    ("esi","esi");                  # broadcast borrow bit
 355         &mov    (&DWP(24,"edi"),"ecx");
 356         &mov    (&DWP(28,"edi"),"edx");
 357
 358         # if a-b borrows, add modulus.
 359         #
 360         # Note that because mod has special form, i.e. consists of
 361         # 0xffffffff, 1 and 0s, we can conditionally synthesize it by
 362         # assigning borrow bit to one register, %ebp, and its negative
 363         # to another, %esi. But we started by calculating %esi...
 364
 365         &mov    ("eax",&DWP(0,"edi"));
 366         &mov    ("ebp","esi");
 367         &mov    ("ebx",&DWP(4,"edi"));
 368         &shr    ("ebp",31);
 369         &mov    ("ecx",&DWP(8,"edi"));
 370         &add    ("eax","esi");
 371         &mov    ("edx",&DWP(12,"edi"));
 372         &adc    ("ebx","esi");
 373         &mov    (&DWP(0,"edi"),"eax");
 374         &adc    ("ecx","esi");
 375         &mov    (&DWP(4,"edi"),"ebx");
 376         &adc    ("edx",0);
 377         &mov    (&DWP(8,"edi"),"ecx");
 378         &mov    (&DWP(12,"edi"),"edx");
 379
 380         &mov    ("eax",&DWP(16,"edi"));
 381         &mov    ("ebx",&DWP(20,"edi"));
 382         &mov    ("ecx",&DWP(24,"edi"));
 383         &adc    ("eax",0);
 384         &mov    ("edx",&DWP(28,"edi"));
 385         &adc    ("ebx",0);
 386         &mov    (&DWP(16,"edi"),"eax");
 387         &adc    ("ecx","ebp");
 388         &mov    (&DWP(20,"edi"),"ebx");
 389         &adc    ("edx","esi");
 390         &mov    (&DWP(24,"edi"),"ecx");
 391         &mov    (&DWP(28,"edi"),"edx");
 392
 393         &ret    ();
 394 &function_end_B("_ecp_nistz256_sub");
 395
 396 ########################################################################
 397 # void ecp_nistz256_neg(BN_ULONG edi[8],const BN_ULONG esi[8]);
 398 &function_begin("ecp_nistz256_neg");
 399         &mov    ("ebp",&wparam(1));
 400         &mov    ("edi",&wparam(0));
 401
 402         &xor    ("eax","eax");
 403         &stack_push(8);
 404         &mov    (&DWP(0,"esp"),"eax");
 405         &mov    ("esi","esp");
 406         &mov    (&DWP(4,"esp"),"eax");
 407         &mov    (&DWP(8,"esp"),"eax");
 408         &mov    (&DWP(12,"esp"),"eax");
 409         &mov    (&DWP(16,"esp"),"eax");
 410         &mov    (&DWP(20,"esp"),"eax");
 411         &mov    (&DWP(24,"esp"),"eax");
 412         &mov    (&DWP(28,"esp"),"eax");
 413
 414         &call   ("_ecp_nistz256_sub");
 415
 416         &stack_pop(8);
 417 &function_end("ecp_nistz256_neg");
 418
 419 &function_begin_B("_picup_eax");
 420         &mov    ("eax",&DWP(0,"esp"));
 421         &ret    ();
 422 &function_end_B("_picup_eax");
 423
 424 ########################################################################
 425 # void ecp_nistz256_to_mont(BN_ULONG edi[8],const BN_ULONG esi[8]);
 426 &function_begin("ecp_nistz256_to_mont");
 427         &mov    ("esi",&wparam(1));
 428         &call   ("_picup_eax");
 429     &set_label("pic");
 430         &lea    ("ebp",&DWP(&label("RR")."-".&label("pic"),"eax"));
 431                                                 if ($sse2) {
 432         &picmeup("eax","OPENSSL_ia32cap_P","eax",&label("pic"));
 433         &mov    ("eax",&DWP(0,"eax"));          }
 434         &mov    ("edi",&wparam(0));
 435         &call   ("_ecp_nistz256_mul_mont");
 436 &function_end("ecp_nistz256_to_mont");
 437
 438 ########################################################################
 439 # void ecp_nistz256_from_mont(BN_ULONG edi[8],const BN_ULONG esi[8]);
 440 &function_begin("ecp_nistz256_from_mont");
 441         &mov    ("esi",&wparam(1));
 442         &call   ("_picup_eax");
 443     &set_label("pic");
 444         &lea    ("ebp",&DWP(&label("ONE")."-".&label("pic"),"eax"));
 445                                                 if ($sse2) {
 446         &picmeup("eax","OPENSSL_ia32cap_P","eax",&label("pic"));
 447         &mov    ("eax",&DWP(0,"eax"));          }
 448         &mov    ("edi",&wparam(0));
 449         &call   ("_ecp_nistz256_mul_mont");
 450 &function_end("ecp_nistz256_from_mont");
 451
 452 ########################################################################
 453 # void ecp_nistz256_mul_mont(BN_ULONG edi[8],const BN_ULONG esi[8],
 454 #                                            const BN_ULONG ebp[8]);
 455 &function_begin("ecp_nistz256_mul_mont");
 456         &mov    ("esi",&wparam(1));
 457         &mov    ("ebp",&wparam(2));
 458                                                 if ($sse2) {
 459         &call   ("_picup_eax");
 460     &set_label("pic");
 461         &picmeup("eax","OPENSSL_ia32cap_P","eax",&label("pic"));
 462         &mov    ("eax",&DWP(0,"eax"));          }
 463         &mov    ("edi",&wparam(0));
 464         &call   ("_ecp_nistz256_mul_mont");
 465 &function_end("ecp_nistz256_mul_mont");
 466
 467 ########################################################################
 468 # void ecp_nistz256_sqr_mont(BN_ULONG edi[8],const BN_ULONG esi[8]);
 469 &function_begin("ecp_nistz256_sqr_mont");
 470         &mov    ("esi",&wparam(1));
 471                                                 if ($sse2) {
 472         &call   ("_picup_eax");
 473     &set_label("pic");
 474         &picmeup("eax","OPENSSL_ia32cap_P","eax",&label("pic"));
 475         &mov    ("eax",&DWP(0,"eax"));          }
 476         &mov    ("edi",&wparam(0));
 477         &mov    ("ebp","esi");
 478         &call   ("_ecp_nistz256_mul_mont");
 479 &function_end("ecp_nistz256_sqr_mont");
 480
 481 &function_begin_B("_ecp_nistz256_mul_mont");
 482                                                 if ($sse2) {
 483         &and    ("eax",1<<24|1<<26);
 484         &cmp    ("eax",1<<24|1<<26);            # see if XMM+SSE2 is on
 485         &jne    (&label("mul_mont_ialu"));
 486
 487         ########################################
 488         # SSE2 code path featuring 32x16-bit
 489         # multiplications is ~2x faster than
 490         # IALU counterpart (except on Atom)...
 491         ########################################
 492         # stack layout:
 493         # +------------------------------------+< %esp
 494         # | 7 16-byte temporary XMM words,     |
 495         # | "sliding" toward lower address     |
 496         # .                                    .
 497         # +------------------------------------+
 498         # | unused XMM word                    |
 499         # +------------------------------------+< +128,%ebx
 500         # | 8 16-byte XMM words holding copies |
 501         # | of a[i]<<64|a[i]                   |
 502         # .                                    .
 503         # .                                    .
 504         # +------------------------------------+< +256
 505         &mov    ("edx","esp");
 506         &sub    ("esp",0x100);
 507
 508         &movd   ("xmm7",&DWP(0,"ebp"));         # b[0] -> 0000.00xy
 509         &lea    ("ebp",&DWP(4,"ebp"));
 510         &pcmpeqd("xmm6","xmm6");
 511         &psrlq  ("xmm6",48);                    # compose 0xffff<<64|0xffff
 512
 513         &pshuflw("xmm7","xmm7",0b11011100);     # 0000.00xy -> 0000.0x0y
 514         &and    ("esp",-64);
 515         &pshufd ("xmm7","xmm7",0b11011100);     # 0000.0x0y -> 000x.000y
 516         &lea    ("ebx",&DWP(0x80,"esp"));
 517
 518         &movd   ("xmm0",&DWP(4*0,"esi"));       # a[0] -> 0000.00xy
 519         &pshufd ("xmm0","xmm0",0b11001100);     # 0000.00xy -> 00xy.00xy
 520         &movd   ("xmm1",&DWP(4*1,"esi"));       # a[1] -> ...
 521         &movdqa (&QWP(0x00,"ebx"),"xmm0");      # offload converted a[0]
 522         &pmuludq("xmm0","xmm7");                # a[0]*b[0]
 523
 524         &movd   ("xmm2",&DWP(4*2,"esi"));
 525         &pshufd ("xmm1","xmm1",0b11001100);
 526         &movdqa (&QWP(0x10,"ebx"),"xmm1");
 527         &pmuludq("xmm1","xmm7");                # a[1]*b[0]
 528
 529          &movq  ("xmm4","xmm0");                # clear upper 64 bits
 530          &pslldq("xmm4",6);
 531          &paddq ("xmm4","xmm0");
 532          &movdqa("xmm5","xmm4");
 533          &psrldq("xmm4",10);                    # upper 32 bits of a[0]*b[0]
 534          &pand  ("xmm5","xmm6");                # lower 32 bits of a[0]*b[0]
 535
 536         # Upper half of a[0]*b[i] is carried into next multiplication
 537         # iteration, while lower one "participates" in actual reduction.
 538         # Normally latter is done by accumulating result of multiplication
 539         # of modulus by "magic" digit, but thanks to special form of modulus
 540         # and "magic" digit it can be performed only with additions and
 541         # subtractions (see note in IALU section below). Note that we are
 542         # not bothered with carry bits, they are accumulated in "flatten"
 543         # phase after all multiplications and reductions.
 544
 545         &movd   ("xmm3",&DWP(4*3,"esi"));
 546         &pshufd ("xmm2","xmm2",0b11001100);
 547         &movdqa (&QWP(0x20,"ebx"),"xmm2");
 548         &pmuludq("xmm2","xmm7");                # a[2]*b[0]
 549          &paddq ("xmm1","xmm4");                # a[1]*b[0]+hw(a[0]*b[0]), carry
 550         &movdqa (&QWP(0x00,"esp"),"xmm1");      # t[0]
 551
 552         &movd   ("xmm0",&DWP(4*4,"esi"));
 553         &pshufd ("xmm3","xmm3",0b11001100);
 554         &movdqa (&QWP(0x30,"ebx"),"xmm3");
 555         &pmuludq("xmm3","xmm7");                # a[3]*b[0]
 556         &movdqa (&QWP(0x10,"esp"),"xmm2");
 557
 558         &movd   ("xmm1",&DWP(4*5,"esi"));
 559         &pshufd ("xmm0","xmm0",0b11001100);
 560         &movdqa (&QWP(0x40,"ebx"),"xmm0");
 561         &pmuludq("xmm0","xmm7");                # a[4]*b[0]
 562          &paddq ("xmm3","xmm5");                # a[3]*b[0]+lw(a[0]*b[0]), reduction step
 563         &movdqa (&QWP(0x20,"esp"),"xmm3");
 564
 565         &movd   ("xmm2",&DWP(4*6,"esi"));
 566         &pshufd ("xmm1","xmm1",0b11001100);
 567         &movdqa (&QWP(0x50,"ebx"),"xmm1");
 568         &pmuludq("xmm1","xmm7");                # a[5]*b[0]
 569         &movdqa (&QWP(0x30,"esp"),"xmm0");
 570          &pshufd("xmm4","xmm5",0b10110001);     # xmm4 = xmm5<<32, reduction step
 571
 572         &movd   ("xmm3",&DWP(4*7,"esi"));
 573         &pshufd ("xmm2","xmm2",0b11001100);
 574         &movdqa (&QWP(0x60,"ebx"),"xmm2");
 575         &pmuludq("xmm2","xmm7");                # a[6]*b[0]
 576         &movdqa (&QWP(0x40,"esp"),"xmm1");
 577          &psubq ("xmm4","xmm5");                # xmm4 = xmm5*0xffffffff, reduction step
 578
 579         &movd   ("xmm0",&DWP(0,"ebp"));         # b[1] -> 0000.00xy
 580         &pshufd ("xmm3","xmm3",0b11001100);
 581         &movdqa (&QWP(0x70,"ebx"),"xmm3");
 582         &pmuludq("xmm3","xmm7");                # a[7]*b[0]
 583
 584         &pshuflw("xmm7","xmm0",0b11011100);     # 0000.00xy -> 0000.0x0y
 585         &movdqa ("xmm0",&QWP(0x00,"ebx"));      # pre-load converted a[0]
 586         &pshufd ("xmm7","xmm7",0b11011100);     # 0000.0x0y -> 000x.000y
 587
 588         &mov    ("ecx",6);
 589         &lea    ("ebp",&DWP(4,"ebp"));
 590         &jmp    (&label("madd_sse2"));
 591
 592 &set_label("madd_sse2",16);
 593          &paddq ("xmm2","xmm5");                # a[6]*b[i-1]+lw(a[0]*b[i-1]), reduction step [modulo-scheduled]
 594          &paddq ("xmm3","xmm4");                # a[7]*b[i-1]+lw(a[0]*b[i-1])*0xffffffff, reduction step [modulo-scheduled]
 595         &movdqa ("xmm1",&QWP(0x10,"ebx"));
 596         &pmuludq("xmm0","xmm7");                # a[0]*b[i]
 597          &movdqa(&QWP(0x50,"esp"),"xmm2");
 598
 599         &movdqa ("xmm2",&QWP(0x20,"ebx"));
 600         &pmuludq("xmm1","xmm7");                # a[1]*b[i]
 601          &movdqa(&QWP(0x60,"esp"),"xmm3");
 602         &paddq  ("xmm0",&QWP(0x00,"esp"));
 603
 604         &movdqa ("xmm3",&QWP(0x30,"ebx"));
 605         &pmuludq("xmm2","xmm7");                # a[2]*b[i]
 606          &movq  ("xmm4","xmm0");                # clear upper 64 bits
 607          &pslldq("xmm4",6);
 608         &paddq  ("xmm1",&QWP(0x10,"esp"));
 609          &paddq ("xmm4","xmm0");
 610          &movdqa("xmm5","xmm4");
 611          &psrldq("xmm4",10);                    # upper 33 bits of a[0]*b[i]+t[0]
 612
 613         &movdqa ("xmm0",&QWP(0x40,"ebx"));
 614         &pmuludq("xmm3","xmm7");                # a[3]*b[i]
 615          &paddq ("xmm1","xmm4");                # a[1]*b[i]+hw(a[0]*b[i]), carry
 616         &paddq  ("xmm2",&QWP(0x20,"esp"));
 617         &movdqa (&QWP(0x00,"esp"),"xmm1");
 618
 619         &movdqa ("xmm1",&QWP(0x50,"ebx"));
 620         &pmuludq("xmm0","xmm7");                # a[4]*b[i]
 621         &paddq  ("xmm3",&QWP(0x30,"esp"));
 622         &movdqa (&QWP(0x10,"esp"),"xmm2");
 623          &pand  ("xmm5","xmm6");                # lower 32 bits of a[0]*b[i]
 624
 625         &movdqa ("xmm2",&QWP(0x60,"ebx"));
 626         &pmuludq("xmm1","xmm7");                # a[5]*b[i]
 627          &paddq ("xmm3","xmm5");                # a[3]*b[i]+lw(a[0]*b[i]), reduction step
 628         &paddq  ("xmm0",&QWP(0x40,"esp"));
 629         &movdqa (&QWP(0x20,"esp"),"xmm3");
 630          &pshufd("xmm4","xmm5",0b10110001);     # xmm4 = xmm5<<32, reduction step
 631
 632         &movdqa ("xmm3","xmm7");
 633         &pmuludq("xmm2","xmm7");                # a[6]*b[i]
 634          &movd  ("xmm7",&DWP(0,"ebp"));         # b[i++] -> 0000.00xy
 635          &lea   ("ebp",&DWP(4,"ebp"));
 636         &paddq  ("xmm1",&QWP(0x50,"esp"));
 637          &psubq ("xmm4","xmm5");                # xmm4 = xmm5*0xffffffff, reduction step
 638         &movdqa (&QWP(0x30,"esp"),"xmm0");
 639          &pshuflw("xmm7","xmm7",0b11011100);    # 0000.00xy -> 0000.0x0y
 640
 641         &pmuludq("xmm3",&QWP(0x70,"ebx"));      # a[7]*b[i]
 642          &pshufd("xmm7","xmm7",0b11011100);     # 0000.0x0y -> 000x.000y
 643          &movdqa("xmm0",&QWP(0x00,"ebx"));      # pre-load converted a[0]
 644         &movdqa (&QWP(0x40,"esp"),"xmm1");
 645         &paddq  ("xmm2",&QWP(0x60,"esp"));
 646
 647         &dec    ("ecx");
 648         &jnz    (&label("madd_sse2"));
 649
 650          &paddq ("xmm2","xmm5");                # a[6]*b[6]+lw(a[0]*b[6]), reduction step [modulo-scheduled]
 651          &paddq ("xmm3","xmm4");                # a[7]*b[6]+lw(a[0]*b[6])*0xffffffff, reduction step [modulo-scheduled]
 652         &movdqa ("xmm1",&QWP(0x10,"ebx"));
 653         &pmuludq("xmm0","xmm7");                # a[0]*b[7]
 654          &movdqa(&QWP(0x50,"esp"),"xmm2");
 655
 656         &movdqa ("xmm2",&QWP(0x20,"ebx"));
 657         &pmuludq("xmm1","xmm7");                # a[1]*b[7]
 658          &movdqa(&QWP(0x60,"esp"),"xmm3");
 659         &paddq  ("xmm0",&QWP(0x00,"esp"));
 660
 661         &movdqa ("xmm3",&QWP(0x30,"ebx"));
 662         &pmuludq("xmm2","xmm7");                # a[2]*b[7]
 663          &movq  ("xmm4","xmm0");                # clear upper 64 bits
 664          &pslldq("xmm4",6);
 665         &paddq  ("xmm1",&QWP(0x10,"esp"));
 666          &paddq ("xmm4","xmm0");
 667          &movdqa("xmm5","xmm4");
 668          &psrldq("xmm4",10);                    # upper 33 bits of a[0]*b[i]+t[0]
 669
 670         &movdqa ("xmm0",&QWP(0x40,"ebx"));
 671         &pmuludq("xmm3","xmm7");                # a[3]*b[7]
 672          &paddq ("xmm1","xmm4");                # a[1]*b[7]+hw(a[0]*b[7]), carry
 673         &paddq  ("xmm2",&QWP(0x20,"esp"));
 674         &movdqa (&QWP(0x00,"esp"),"xmm1");
 675
 676         &movdqa ("xmm1",&QWP(0x50,"ebx"));
 677         &pmuludq("xmm0","xmm7");                # a[4]*b[7]
 678         &paddq  ("xmm3",&QWP(0x30,"esp"));
 679         &movdqa (&QWP(0x10,"esp"),"xmm2");
 680          &pand  ("xmm5","xmm6");                # lower 32 bits of a[0]*b[i]
 681
 682         &movdqa ("xmm2",&QWP(0x60,"ebx"));
 683         &pmuludq("xmm1","xmm7");                # a[5]*b[7]
 684          &paddq ("xmm3","xmm5");                # reduction step
 685         &paddq  ("xmm0",&QWP(0x40,"esp"));
 686         &movdqa (&QWP(0x20,"esp"),"xmm3");
 687          &pshufd("xmm4","xmm5",0b10110001);     # xmm4 = xmm5<<32, reduction step
 688
 689         &movdqa ("xmm3",&QWP(0x70,"ebx"));
 690         &pmuludq("xmm2","xmm7");                # a[6]*b[7]
 691         &paddq  ("xmm1",&QWP(0x50,"esp"));
 692          &psubq ("xmm4","xmm5");                # xmm4 = xmm5*0xffffffff, reduction step
 693         &movdqa (&QWP(0x30,"esp"),"xmm0");
 694
 695         &pmuludq("xmm3","xmm7");                # a[7]*b[7]
 696         &pcmpeqd("xmm7","xmm7");
 697         &movdqa ("xmm0",&QWP(0x00,"esp"));
 698         &pslldq ("xmm7",8);
 699         &movdqa (&QWP(0x40,"esp"),"xmm1");
 700         &paddq  ("xmm2",&QWP(0x60,"esp"));
 701
 702          &paddq ("xmm2","xmm5");                # a[6]*b[7]+lw(a[0]*b[7]), reduction step
 703          &paddq ("xmm3","xmm4");                # a[6]*b[7]+lw(a[0]*b[7])*0xffffffff, reduction step
 704          &movdqa(&QWP(0x50,"esp"),"xmm2");
 705          &movdqa(&QWP(0x60,"esp"),"xmm3");
 706
 707         &movdqa ("xmm1",&QWP(0x10,"esp"));
 708         &movdqa ("xmm2",&QWP(0x20,"esp"));
 709         &movdqa ("xmm3",&QWP(0x30,"esp"));
 710
 711         &movq   ("xmm4","xmm0");                # "flatten"
 712         &pand   ("xmm0","xmm7");
 713         &xor    ("ebp","ebp");
 714         &pslldq ("xmm4",6);
 715          &movq  ("xmm5","xmm1");
 716         &paddq  ("xmm0","xmm4");
 717          &pand  ("xmm1","xmm7");
 718         &psrldq ("xmm0",6);
 719         &movd   ("eax","xmm0");
 720         &psrldq ("xmm0",4);
 721
 722         &paddq  ("xmm5","xmm0");
 723         &movdqa ("xmm0",&QWP(0x40,"esp"));
 724         &sub    ("eax",-1);                     # start subtracting modulus,
 725                                                 # this is used to determine
 726                                                 # if result is larger/smaller
 727                                                 # than modulus (see below)
 728         &pslldq ("xmm5",6);
 729          &movq  ("xmm4","xmm2");
 730         &paddq  ("xmm1","xmm5");
 731          &pand  ("xmm2","xmm7");
 732         &psrldq ("xmm1",6);
 733         &mov    (&DWP(4*0,"edi"),"eax");
 734         &movd   ("eax","xmm1");
 735         &psrldq ("xmm1",4);
 736
 737         &paddq  ("xmm4","xmm1");
 738         &movdqa ("xmm1",&QWP(0x50,"esp"));
 739         &sbb    ("eax",-1);
 740         &pslldq ("xmm4",6);
 741          &movq  ("xmm5","xmm3");
 742         &paddq  ("xmm2","xmm4");
 743          &pand  ("xmm3","xmm7");
 744         &psrldq ("xmm2",6);
 745         &mov    (&DWP(4*1,"edi"),"eax");
 746         &movd   ("eax","xmm2");
 747         &psrldq ("xmm2",4);
 748
 749         &paddq  ("xmm5","xmm2");
 750         &movdqa ("xmm2",&QWP(0x60,"esp"));
 751         &sbb    ("eax",-1);
 752         &pslldq ("xmm5",6);
 753          &movq  ("xmm4","xmm0");
 754         &paddq  ("xmm3","xmm5");
 755          &pand  ("xmm0","xmm7");
 756         &psrldq ("xmm3",6);
 757         &mov    (&DWP(4*2,"edi"),"eax");
 758         &movd   ("eax","xmm3");
 759         &psrldq ("xmm3",4);
 760
 761         &paddq  ("xmm4","xmm3");
 762         &sbb    ("eax",0);
 763         &pslldq ("xmm4",6);
 764          &movq  ("xmm5","xmm1");
 765         &paddq  ("xmm0","xmm4");
 766          &pand  ("xmm1","xmm7");
 767         &psrldq ("xmm0",6);
 768         &mov    (&DWP(4*3,"edi"),"eax");
 769         &movd   ("eax","xmm0");
 770         &psrldq ("xmm0",4);
 771
 772         &paddq  ("xmm5","xmm0");
 773         &sbb    ("eax",0);
 774         &pslldq ("xmm5",6);
 775          &movq  ("xmm4","xmm2");
 776         &paddq  ("xmm1","xmm5");
 777          &pand  ("xmm2","xmm7");
 778         &psrldq ("xmm1",6);
 779         &movd   ("ebx","xmm1");
 780         &psrldq ("xmm1",4);
 781         &mov    ("esp","edx");
 782
 783         &paddq  ("xmm4","xmm1");
 784         &pslldq ("xmm4",6);
 785         &paddq  ("xmm2","xmm4");
 786         &psrldq ("xmm2",6);
 787         &movd   ("ecx","xmm2");
 788         &psrldq ("xmm2",4);
 789         &sbb    ("ebx",0);
 790         &movd   ("edx","xmm2");
 791         &pextrw ("esi","xmm2",2);               # top-most overflow bit
 792         &sbb    ("ecx",1);
 793         &sbb    ("edx",-1);
 794         &sbb    ("esi",0);                      # borrow from subtraction
 795
 796         # Final step is "if result > mod, subtract mod", and at this point
 797         # we have result - mod written to output buffer, as well as borrow
 798         # bit from this subtraction, and if borrow bit is set, we add
 799         # modulus back.
 800         #
 801         # Note that because mod has special form, i.e. consists of
 802         # 0xffffffff, 1 and 0s, we can conditionally synthesize it by
 803         # assigning borrow bit to one register, %ebp, and its negative
 804         # to another, %esi. But we started by calculating %esi...
 805
 806         &sub    ("ebp","esi");
 807         &add    (&DWP(4*0,"edi"),"esi");        # add modulus or zero
 808         &adc    (&DWP(4*1,"edi"),"esi");
 809         &adc    (&DWP(4*2,"edi"),"esi");
 810         &adc    (&DWP(4*3,"edi"),0);
 811         &adc    ("eax",0);
 812         &adc    ("ebx",0);
 813         &mov    (&DWP(4*4,"edi"),"eax");
 814         &adc    ("ecx","ebp");
 815         &mov    (&DWP(4*5,"edi"),"ebx");
 816         &adc    ("edx","esi");
 817         &mov    (&DWP(4*6,"edi"),"ecx");
 818         &mov    (&DWP(4*7,"edi"),"edx");
 819
 820         &ret    ();
 821
 822 &set_label("mul_mont_ialu",16);                 }
 823
 824         ########################################
 825         # IALU code path suitable for all CPUs.
 826         ########################################
 827         # stack layout:
 828         # +------------------------------------+< %esp
 829         # | 8 32-bit temporary words, accessed |
 830         # | as circular buffer                 |
 831         # .                                    .
 832         # .                                    .
 833         # +------------------------------------+< +32
 834         # | offloaded destination pointer      |
 835         # +------------------------------------+
 836         # | unused                             |
 837         # +------------------------------------+< +40
 838         &sub    ("esp",10*4);
 839
 840         &mov    ("eax",&DWP(0*4,"esi"));                # a[0]
 841         &mov    ("ebx",&DWP(0*4,"ebp"));                # b[0]
 842         &mov    (&DWP(8*4,"esp"),"edi");                # off-load dst ptr
 843
 844         &mul    ("ebx");                                # a[0]*b[0]
 845         &mov    (&DWP(0*4,"esp"),"eax");                # t[0]
 846         &mov    ("eax",&DWP(1*4,"esi"));
 847         &mov    ("ecx","edx")
 848
 849         &mul    ("ebx");                                # a[1]*b[0]
 850         &add    ("ecx","eax");
 851         &mov    ("eax",&DWP(2*4,"esi"));
 852         &adc    ("edx",0);
 853         &mov    (&DWP(1*4,"esp"),"ecx");                # t[1]
 854         &mov    ("ecx","edx");
 855
 856         &mul    ("ebx");                                # a[2]*b[0]
 857         &add    ("ecx","eax");
 858         &mov    ("eax",&DWP(3*4,"esi"));
 859         &adc    ("edx",0);
 860         &mov    (&DWP(2*4,"esp"),"ecx");                # t[2]
 861         &mov    ("ecx","edx");
 862
 863         &mul    ("ebx");                                # a[3]*b[0]
 864         &add    ("ecx","eax");
 865         &mov    ("eax",&DWP(4*4,"esi"));
 866         &adc    ("edx",0);
 867         &mov    (&DWP(3*4,"esp"),"ecx");                # t[3]
 868         &mov    ("ecx","edx");
 869
 870         &mul    ("ebx");                                # a[4]*b[0]
 871         &add    ("ecx","eax");
 872         &mov    ("eax",&DWP(5*4,"esi"));
 873         &adc    ("edx",0);
 874         &mov    (&DWP(4*4,"esp"),"ecx");                # t[4]
 875         &mov    ("ecx","edx");
 876
 877         &mul    ("ebx");                                # a[5]*b[0]
 878         &add    ("ecx","eax");
 879         &mov    ("eax",&DWP(6*4,"esi"));
 880         &adc    ("edx",0);
 881         &mov    (&DWP(5*4,"esp"),"ecx");                # t[5]
 882         &mov    ("ecx","edx");
 883
 884         &mul    ("ebx");                                # a[6]*b[0]
 885         &add    ("ecx","eax");
 886         &mov    ("eax",&DWP(7*4,"esi"));
 887         &adc    ("edx",0);
 888         &mov    (&DWP(6*4,"esp"),"ecx");                # t[6]
 889         &mov    ("ecx","edx");
 890
 891         &xor    ("edi","edi");                          # initial top-most carry
 892         &mul    ("ebx");                                # a[7]*b[0]
 893         &add    ("ecx","eax");                          # t[7]
 894         &mov    ("eax",&DWP(0*4,"esp"));                # t[0]
 895         &adc    ("edx",0);                              # t[8]
 896
 897 for ($i=0;$i<7;$i++) {
 898         my $j=$i+1;
 899
 900         # Reduction iteration is normally performed by accumulating
 901         # result of multiplication of modulus by "magic" digit [and
 902         # omitting least significant word, which is guaranteed to
 903         # be 0], but thanks to special form of modulus and "magic"
 904         # digit being equal to least significant word, it can be
 905         # performed with additions and subtractions alone. Indeed:
 906         #
 907         #        ffff.0001.0000.0000.0000.ffff.ffff.ffff
 908         # *                                         abcd
 909         # + xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.abcd
 910         #
 911         # Now observing that ff..ff*x = (2^n-1)*x = 2^n*x-x, we
 912         # rewrite above as:
 913         #
 914         #   xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.abcd
 915         # + abcd.0000.abcd.0000.0000.abcd.0000.0000.0000
 916         # -      abcd.0000.0000.0000.0000.0000.0000.abcd
 917         #
 918         # or marking redundant operations:
 919         #
 920         #   xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.----
 921         # + abcd.0000.abcd.0000.0000.abcd.----.----.----
 922         # -      abcd.----.----.----.----.----.----.----
 923
 924         &add    (&DWP((($i+3)%8)*4,"esp"),"eax");       # t[3]+=t[0]
 925         &adc    (&DWP((($i+4)%8)*4,"esp"),0);           # t[4]+=0
 926         &adc    (&DWP((($i+5)%8)*4,"esp"),0);           # t[5]+=0
 927         &adc    (&DWP((($i+6)%8)*4,"esp"),"eax");       # t[6]+=t[0]
 928         &adc    ("ecx",0);                              # t[7]+=0
 929         &adc    ("edx","eax");                          # t[8]+=t[0]
 930         &adc    ("edi",0);                              # top-most carry
 931          &mov   ("ebx",&DWP($j*4,"ebp"));               # b[i]
 932         &sub    ("ecx","eax");                          # t[7]-=t[0]
 933          &mov   ("eax",&DWP(0*4,"esi"));                # a[0]
 934         &sbb    ("edx",0);                              # t[8]-=0
 935         &mov    (&DWP((($i+7)%8)*4,"esp"),"ecx");
 936         &sbb    ("edi",0);                              # top-most carry,
 937                                                         # keep in mind that
 938                                                         # netto result is
 939                                                         # *addition* of value
 940                                                         # with (abcd<<32)-abcd
 941                                                         # on top, so that
 942                                                         # underflow is
 943                                                         # impossible, because
 944                                                         # (abcd<<32)-abcd
 945                                                         # doesn't underflow
 946         &mov    (&DWP((($i+8)%8)*4,"esp"),"edx");
 947
 948         &mul    ("ebx");                                # a[0]*b[i]
 949         &add    ("eax",&DWP((($j+0)%8)*4,"esp"));
 950         &adc    ("edx",0);
 951         &mov    (&DWP((($j+0)%8)*4,"esp"),"eax");
 952         &mov    ("eax",&DWP(1*4,"esi"));
 953         &mov    ("ecx","edx")
 954
 955         &mul    ("ebx");                                # a[1]*b[i]
 956         &add    ("ecx",&DWP((($j+1)%8)*4,"esp"));
 957         &adc    ("edx",0);
 958         &add    ("ecx","eax");
 959         &adc    ("edx",0);
 960         &mov    ("eax",&DWP(2*4,"esi"));
 961         &mov    (&DWP((($j+1)%8)*4,"esp"),"ecx");
 962         &mov    ("ecx","edx");
 963
 964         &mul    ("ebx");                                # a[2]*b[i]
 965         &add    ("ecx",&DWP((($j+2)%8)*4,"esp"));
 966         &adc    ("edx",0);
 967         &add    ("ecx","eax");
 968         &adc    ("edx",0);
 969         &mov    ("eax",&DWP(3*4,"esi"));
 970         &mov    (&DWP((($j+2)%8)*4,"esp"),"ecx");
 971         &mov    ("ecx","edx");
 972
 973         &mul    ("ebx");                                # a[3]*b[i]
 974         &add    ("ecx",&DWP((($j+3)%8)*4,"esp"));
 975         &adc    ("edx",0);
 976         &add    ("ecx","eax");
 977         &adc    ("edx",0);
 978         &mov    ("eax",&DWP(4*4,"esi"));
 979         &mov    (&DWP((($j+3)%8)*4,"esp"),"ecx");
 980         &mov    ("ecx","edx");
 981
 982         &mul    ("ebx");                                # a[4]*b[i]
 983         &add    ("ecx",&DWP((($j+4)%8)*4,"esp"));
 984         &adc    ("edx",0);
 985         &add    ("ecx","eax");
 986         &adc    ("edx",0);
 987         &mov    ("eax",&DWP(5*4,"esi"));
 988         &mov    (&DWP((($j+4)%8)*4,"esp"),"ecx");
 989         &mov    ("ecx","edx");
 990
 991         &mul    ("ebx");                                # a[5]*b[i]
 992         &add    ("ecx",&DWP((($j+5)%8)*4,"esp"));
 993         &adc    ("edx",0);
 994         &add    ("ecx","eax");
 995         &adc    ("edx",0);
 996         &mov    ("eax",&DWP(6*4,"esi"));
 997         &mov    (&DWP((($j+5)%8)*4,"esp"),"ecx");
 998         &mov    ("ecx","edx");
 999
1000         &mul    ("ebx");                                # a[6]*b[i]
1001         &add    ("ecx",&DWP((($j+6)%8)*4,"esp"));
1002         &adc    ("edx",0);
1003         &add    ("ecx","eax");
1004         &adc    ("edx",0);
1005         &mov    ("eax",&DWP(7*4,"esi"));
1006         &mov    (&DWP((($j+6)%8)*4,"esp"),"ecx");
1007         &mov    ("ecx","edx");
1008
1009         &mul    ("ebx");                                # a[7]*b[i]
1010         &add    ("ecx",&DWP((($j+7)%8)*4,"esp"));
1011         &adc    ("edx",0);
1012         &add    ("ecx","eax");                          # t[7]
1013         &mov    ("eax",&DWP((($j+0)%8)*4,"esp"));       # t[0]
1014         &adc    ("edx","edi");                          # t[8]
1015         &mov    ("edi",0);
1016         &adc    ("edi",0);                              # top-most carry
1017 }
1018         &mov    ("ebp",&DWP(8*4,"esp"));                # restore dst ptr
1019         &xor    ("esi","esi");
1020         my $j=$i+1;
1021
1022         # last multiplication-less reduction
1023         &add    (&DWP((($i+3)%8)*4,"esp"),"eax");       # t[3]+=t[0]
1024         &adc    (&DWP((($i+4)%8)*4,"esp"),0);           # t[4]+=0
1025         &adc    (&DWP((($i+5)%8)*4,"esp"),0);           # t[5]+=0
1026         &adc    (&DWP((($i+6)%8)*4,"esp"),"eax");       # t[6]+=t[0]
1027         &adc    ("ecx",0);                              # t[7]+=0
1028         &adc    ("edx","eax");                          # t[8]+=t[0]
1029         &adc    ("edi",0);                              # top-most carry
1030          &mov   ("ebx",&DWP((($j+1)%8)*4,"esp"));
1031         &sub    ("ecx","eax");                          # t[7]-=t[0]
1032          &mov   ("eax",&DWP((($j+0)%8)*4,"esp"));
1033         &sbb    ("edx",0);                              # t[8]-=0
1034         &mov    (&DWP((($i+7)%8)*4,"esp"),"ecx");
1035         &sbb    ("edi",0);                              # top-most carry
1036         &mov    (&DWP((($i+8)%8)*4,"esp"),"edx");
1037
1038         # Final step is "if result > mod, subtract mod", but we do it
1039         # "other way around", namely write result - mod to output buffer
1040         # and if subtraction borrowed, add modulus back.
1041
1042         &mov    ("ecx",&DWP((($j+2)%8)*4,"esp"));
1043         &sub    ("eax",-1);
1044         &mov    ("edx",&DWP((($j+3)%8)*4,"esp"));
1045         &sbb    ("ebx",-1);
1046         &mov    (&DWP(0*4,"ebp"),"eax");
1047         &sbb    ("ecx",-1);
1048         &mov    (&DWP(1*4,"ebp"),"ebx");
1049         &sbb    ("edx",0);
1050         &mov    (&DWP(2*4,"ebp"),"ecx");
1051         &mov    (&DWP(3*4,"ebp"),"edx");
1052
1053         &mov    ("eax",&DWP((($j+4)%8)*4,"esp"));
1054         &mov    ("ebx",&DWP((($j+5)%8)*4,"esp"));
1055         &mov    ("ecx",&DWP((($j+6)%8)*4,"esp"));
1056         &sbb    ("eax",0);
1057         &mov    ("edx",&DWP((($j+7)%8)*4,"esp"));
1058         &sbb    ("ebx",0);
1059         &sbb    ("ecx",1);
1060         &sbb    ("edx",-1);
1061         &sbb    ("edi",0);
1062
1063         # Note that because mod has special form, i.e. consists of
1064         # 0xffffffff, 1 and 0s, we can conditionally synthesize it by
1065         # assigning borrow bit to one register, %ebp, and its negative
1066         # to another, %esi. But we started by calculating %esi...
1067
1068         &sub    ("esi","edi");
1069         &add    (&DWP(0*4,"ebp"),"edi");                # add modulus or zero
1070         &adc    (&DWP(1*4,"ebp"),"edi");
1071         &adc    (&DWP(2*4,"ebp"),"edi");
1072         &adc    (&DWP(3*4,"ebp"),0);
1073         &adc    ("eax",0);
1074         &adc    ("ebx",0);
1075         &mov    (&DWP(4*4,"ebp"),"eax");
1076         &adc    ("ecx","esi");
1077         &mov    (&DWP(5*4,"ebp"),"ebx");
1078         &adc    ("edx","edi");
1079         &mov    (&DWP(6*4,"ebp"),"ecx");
1080         &mov    ("edi","ebp");                          # fulfill contract
1081         &mov    (&DWP(7*4,"ebp"),"edx");
1082
1083         &add    ("esp",10*4);
1084         &ret    ();
1085 &function_end_B("_ecp_nistz256_mul_mont");
1086
1087 ########################################################################
1088 # void ecp_nistz256_scatter_w5(void *edi,const P256_POINT *esi,
1089 #                                        int ebp);
1090 &function_begin("ecp_nistz256_scatter_w5");
1091         &mov    ("edi",&wparam(0));
1092         &mov    ("esi",&wparam(1));
1093         &mov    ("ebp",&wparam(2));
1094
1095         &lea    ("edi",&DWP(128-4,"edi","ebp",4));
1096         &mov    ("ebp",96/16);
1097 &set_label("scatter_w5_loop");
1098         &mov    ("eax",&DWP(0,"esi"));
1099         &mov    ("ebx",&DWP(4,"esi"));
1100         &mov    ("ecx",&DWP(8,"esi"));
1101         &mov    ("edx",&DWP(12,"esi"));
1102         &lea    ("esi",&DWP(16,"esi"));
1103         &mov    (&DWP(64*0-128,"edi"),"eax");
1104         &mov    (&DWP(64*1-128,"edi"),"ebx");
1105         &mov    (&DWP(64*2-128,"edi"),"ecx");
1106         &mov    (&DWP(64*3-128,"edi"),"edx");
1107         &lea    ("edi",&DWP(64*4,"edi"));
1108         &dec    ("ebp");
1109         &jnz    (&label("scatter_w5_loop"));
1110 &function_end("ecp_nistz256_scatter_w5");
1111
1112 ########################################################################
1113 # void ecp_nistz256_gather_w5(P256_POINT *edi,const void *esi,
1114 #                                             int ebp);
1115 &function_begin("ecp_nistz256_gather_w5");
1116         &mov    ("esi",&wparam(1));
1117         &mov    ("ebp",&wparam(2));
1118
1119         &lea    ("esi",&DWP(0,"esi","ebp",4));
1120         &neg    ("ebp");
1121         &sar    ("ebp",31);
1122         &mov    ("edi",&wparam(0));
1123         &lea    ("esi",&DWP(0,"esi","ebp",4));
1124
1125     for($i=0;$i<24;$i+=4) {
1126         &mov    ("eax",&DWP(64*($i+0),"esi"));
1127         &mov    ("ebx",&DWP(64*($i+1),"esi"));
1128         &mov    ("ecx",&DWP(64*($i+2),"esi"));
1129         &mov    ("edx",&DWP(64*($i+3),"esi"));
1130         &and    ("eax","ebp");
1131         &and    ("ebx","ebp");
1132         &and    ("ecx","ebp");
1133         &and    ("edx","ebp");
1134         &mov    (&DWP(4*($i+0),"edi"),"eax");
1135         &mov    (&DWP(4*($i+1),"edi"),"ebx");
1136         &mov    (&DWP(4*($i+2),"edi"),"ecx");
1137         &mov    (&DWP(4*($i+3),"edi"),"edx");
1138     }
1139 &function_end("ecp_nistz256_gather_w5");
1140
1141 ########################################################################
1142 # void ecp_nistz256_scatter_w7(void *edi,const P256_POINT_AFFINE *esi,
1143 #                                        int ebp);
1144 &function_begin("ecp_nistz256_scatter_w7");
1145         &mov    ("edi",&wparam(0));
1146         &mov    ("esi",&wparam(1));
1147         &mov    ("ebp",&wparam(2));
1148
1149         &lea    ("edi",&DWP(-1,"edi","ebp"));
1150         &mov    ("ebp",64/4);
1151 &set_label("scatter_w7_loop");
1152         &mov    ("eax",&DWP(0,"esi"));
1153         &lea    ("esi",&DWP(4,"esi"));
1154         &mov    (&BP(64*0,"edi"),"al");
1155         &mov    (&BP(64*1,"edi"),"ah");
1156         &shr    ("eax",16);
1157         &mov    (&BP(64*2,"edi"),"al");
1158         &mov    (&BP(64*3,"edi"),"ah");
1159         &lea    ("edi",&DWP(64*4,"edi"));
1160         &dec    ("ebp");
1161         &jnz    (&label("scatter_w7_loop"));
1162 &function_end("ecp_nistz256_scatter_w7");
1163
1164 ########################################################################
1165 # void ecp_nistz256_gather_w7(P256_POINT_AFFINE *edi,const void *esi,
1166 #                                                    int ebp);
1167 &function_begin("ecp_nistz256_gather_w7");
1168         &mov    ("esi",&wparam(1));
1169         &mov    ("ebp",&wparam(2));
1170
1171         &add    ("esi","ebp");
1172         &neg    ("ebp"),
1173         &sar    ("ebp",31);
1174         &mov    ("edi",&wparam(0));
1175         &lea    ("esi",&DWP(0,"esi","ebp"));
1176
1177     for($i=0;$i<64;$i+=4) {
1178         &movz   ("eax",&BP(64*($i+0),"esi"));
1179         &movz   ("ebx",&BP(64*($i+1),"esi"));
1180         &movz   ("ecx",&BP(64*($i+2),"esi"));
1181         &and    ("eax","ebp");
1182         &movz   ("edx",&BP(64*($i+3),"esi"));
1183         &and    ("ebx","ebp");
1184         &mov    (&BP($i+0,"edi"),"al");
1185         &and    ("ecx","ebp");
1186         &mov    (&BP($i+1,"edi"),"bl");
1187         &and    ("edx","ebp");
1188         &mov    (&BP($i+2,"edi"),"cl");
1189         &mov    (&BP($i+3,"edi"),"dl");
1190     }
1191 &function_end("ecp_nistz256_gather_w7");
1192
1193 ########################################################################
1194 # following subroutines are "literal" implementation of those found in
1195 # ecp_nistz256.c
1196 #
1197 ########################################################################
1198 # void ecp_nistz256_point_double(P256_POINT *out,const P256_POINT *inp);
1199 #
1200 &function_begin("ecp_nistz256_point_double");
1201 {   my ($S,$M,$Zsqr,$in_x,$tmp0)=map(32*$_,(0..4));
1202
1203         &mov    ("esi",&wparam(1));
1204
1205         # above map() describes stack layout with 5 temporary
1206         # 256-bit vectors on top, then we take extra word for
1207         # OPENSSL_ia32cap_P copy.
1208         &stack_push(8*5+1);
1209                                                 if ($sse2) {
1210         &call   ("_picup_eax");
1211     &set_label("pic");
1212         &picmeup("edx","OPENSSL_ia32cap_P","eax",&label("pic"));
1213         &mov    ("ebp",&DWP(0,"edx"));          }
1214
1215         &mov    ("eax",&DWP(0,"esi"));          # copy in_x
1216         &mov    ("ebx",&DWP(4,"esi"));
1217         &mov    ("ecx",&DWP(8,"esi"));
1218         &mov    ("edx",&DWP(12,"esi"));
1219         &mov    (&DWP($in_x+0,"esp"),"eax");
1220         &mov    (&DWP($in_x+4,"esp"),"ebx");
1221         &mov    (&DWP($in_x+8,"esp"),"ecx");
1222         &mov    (&DWP($in_x+12,"esp"),"edx");
1223         &mov    ("eax",&DWP(16,"esi"));
1224         &mov    ("ebx",&DWP(20,"esi"));
1225         &mov    ("ecx",&DWP(24,"esi"));
1226         &mov    ("edx",&DWP(28,"esi"));
1227         &mov    (&DWP($in_x+16,"esp"),"eax");
1228         &mov    (&DWP($in_x+20,"esp"),"ebx");
1229         &mov    (&DWP($in_x+24,"esp"),"ecx");
1230         &mov    (&DWP($in_x+28,"esp"),"edx");
1231         &mov    (&DWP(32*5,"esp"),"ebp");       # OPENSSL_ia32cap_P copy
1232
1233         &lea    ("ebp",&DWP(32,"esi"));
1234         &lea    ("esi",&DWP(32,"esi"));
1235         &lea    ("edi",&DWP($S,"esp"));
1236         &call   ("_ecp_nistz256_add");          # p256_mul_by_2(S, in_y);
1237
1238         &mov    ("eax",&DWP(32*5,"esp"));       # OPENSSL_ia32cap_P copy
1239         &mov    ("esi",64);
1240         &add    ("esi",&wparam(1));
1241         &lea    ("edi",&DWP($Zsqr,"esp"));
1242         &mov    ("ebp","esi");
1243         &call   ("_ecp_nistz256_mul_mont");     # p256_sqr_mont(Zsqr, in_z);
1244
1245         &mov    ("eax",&DWP(32*5,"esp"));       # OPENSSL_ia32cap_P copy
1246         &lea    ("esi",&DWP($S,"esp"));
1247         &lea    ("ebp",&DWP($S,"esp"));
1248         &lea    ("edi",&DWP($S,"esp"));
1249         &call   ("_ecp_nistz256_mul_mont");     # p256_sqr_mont(S, S);
1250
1251         &mov    ("eax",&DWP(32*5,"esp"));       # OPENSSL_ia32cap_P copy
1252         &mov    ("ebp",&wparam(1));
1253         &lea    ("esi",&DWP(32,"ebp"));
1254         &lea    ("ebp",&DWP(64,"ebp"));
1255         &lea    ("edi",&DWP($tmp0,"esp"));
1256         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(tmp0, in_z, in_y);
1257
1258         &lea    ("esi",&DWP($in_x,"esp"));
1259         &lea    ("ebp",&DWP($Zsqr,"esp"));
1260         &lea    ("edi",&DWP($M,"esp"));
1261         &call   ("_ecp_nistz256_add");          # p256_add(M, in_x, Zsqr);
1262
1263         &mov    ("edi",64);
1264         &lea    ("esi",&DWP($tmp0,"esp"));
1265         &lea    ("ebp",&DWP($tmp0,"esp"));
1266         &add    ("edi",&wparam(0));
1267         &call   ("_ecp_nistz256_add");          # p256_mul_by_2(res_z, tmp0);
1268
1269         &lea    ("esi",&DWP($in_x,"esp"));
1270         &lea    ("ebp",&DWP($Zsqr,"esp"));
1271         &lea    ("edi",&DWP($Zsqr,"esp"));
1272         &call   ("_ecp_nistz256_sub");          # p256_sub(Zsqr, in_x, Zsqr);
1273
1274         &mov    ("eax",&DWP(32*5,"esp"));       # OPENSSL_ia32cap_P copy
1275         &lea    ("esi",&DWP($S,"esp"));
1276         &lea    ("ebp",&DWP($S,"esp"));
1277         &lea    ("edi",&DWP($tmp0,"esp"));
1278         &call   ("_ecp_nistz256_mul_mont");     # p256_sqr_mont(tmp0, S);
1279
1280         &mov    ("eax",&DWP(32*5,"esp"));       # OPENSSL_ia32cap_P copy
1281         &lea    ("esi",&DWP($M,"esp"));
1282         &lea    ("ebp",&DWP($Zsqr,"esp"));
1283         &lea    ("edi",&DWP($M,"esp"));
1284         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(M, M, Zsqr);
1285
1286         &mov    ("edi",32);
1287         &lea    ("esi",&DWP($tmp0,"esp"));
1288         &add    ("edi",&wparam(0));
1289         &call   ("_ecp_nistz256_div_by_2");     # p256_div_by_2(res_y, tmp0);
1290
1291         &lea    ("esi",&DWP($M,"esp"));
1292         &lea    ("ebp",&DWP($M,"esp"));
1293         &lea    ("edi",&DWP($tmp0,"esp"));
1294         &call   ("_ecp_nistz256_add");          # 1/2 p256_mul_by_3(M, M);
1295
1296         &mov    ("eax",&DWP(32*5,"esp"));       # OPENSSL_ia32cap_P copy
1297         &lea    ("esi",&DWP($in_x,"esp"));
1298         &lea    ("ebp",&DWP($S,"esp"));
1299         &lea    ("edi",&DWP($S,"esp"));
1300         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(S, S, in_x);
1301
1302         &lea    ("esi",&DWP($tmp0,"esp"));
1303         &lea    ("ebp",&DWP($M,"esp"));
1304         &lea    ("edi",&DWP($M,"esp"));
1305         &call   ("_ecp_nistz256_add");          # 2/2 p256_mul_by_3(M, M);
1306
1307         &lea    ("esi",&DWP($S,"esp"));
1308         &lea    ("ebp",&DWP($S,"esp"));
1309         &lea    ("edi",&DWP($tmp0,"esp"));
1310         &call   ("_ecp_nistz256_add");          # p256_mul_by_2(tmp0, S);
1311
1312         &mov    ("eax",&DWP(32*5,"esp"));       # OPENSSL_ia32cap_P copy
1313         &lea    ("esi",&DWP($M,"esp"));
1314         &lea    ("ebp",&DWP($M,"esp"));
1315         &mov    ("edi",&wparam(0));
1316         &call   ("_ecp_nistz256_mul_mont");     # p256_sqr_mont(res_x, M);
1317
1318         &mov    ("esi","edi");                  # %edi is still res_x here
1319         &lea    ("ebp",&DWP($tmp0,"esp"));
1320         &call   ("_ecp_nistz256_sub");          # p256_sub(res_x, res_x, tmp0);
1321
1322         &lea    ("esi",&DWP($S,"esp"));
1323         &mov    ("ebp","edi");                  # %edi is still res_x
1324         &lea    ("edi",&DWP($S,"esp"));
1325         &call   ("_ecp_nistz256_sub");          # p256_sub(S, S, res_x);
1326
1327         &mov    ("eax",&DWP(32*5,"esp"));       # OPENSSL_ia32cap_P copy
1328         &mov    ("esi","edi");                  # %edi is still &S
1329         &lea    ("ebp",&DWP($M,"esp"));
1330         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(S, S, M);
1331
1332         &mov    ("ebp",32);
1333         &lea    ("esi",&DWP($S,"esp"));
1334         &add    ("ebp",&wparam(0));
1335         &mov    ("edi","ebp");
1336         &call   ("_ecp_nistz256_sub");          # p256_sub(res_y, S, res_y);
1337
1338         &stack_pop(8*5+1);
1339 } &function_end("ecp_nistz256_point_double");
1340
1341 ########################################################################
1342 # void ecp_nistz256_point_add(P256_POINT *out,const P256_POINT *in1,
1343 #                                             const P256_POINT *in2);
1344 &function_begin("ecp_nistz256_point_add");
1345 {   my ($res_x,$res_y,$res_z,
1346         $in1_x,$in1_y,$in1_z,
1347         $in2_x,$in2_y,$in2_z,
1348         $H,$Hsqr,$R,$Rsqr,$Hcub,
1349         $U1,$U2,$S1,$S2)=map(32*$_,(0..17));
1350     my ($Z1sqr, $Z2sqr) = ($Hsqr, $Rsqr);
1351
1352         &mov    ("esi",&wparam(2));
1353
1354         # above map() describes stack layout with 18 temporary
1355         # 256-bit vectors on top, then we take extra words for
1356         # !in1infty, !in2infty, result of check for zero and
1357         # OPENSSL_ia32cap_P copy. [one unused word for padding]
1358         &stack_push(8*18+5);
1359                                                 if ($sse2) {
1360         &call   ("_picup_eax");
1361     &set_label("pic");
1362         &picmeup("edx","OPENSSL_ia32cap_P","eax",&label("pic"));
1363         &mov    ("ebp",&DWP(0,"edx"));          }
1364
1365         &lea    ("edi",&DWP($in2_x,"esp"));
1366     for($i=0;$i<96;$i+=16) {
1367         &mov    ("eax",&DWP($i+0,"esi"));       # copy in2
1368         &mov    ("ebx",&DWP($i+4,"esi"));
1369         &mov    ("ecx",&DWP($i+8,"esi"));
1370         &mov    ("edx",&DWP($i+12,"esi"));
1371         &mov    (&DWP($i+0,"edi"),"eax");
1372         &mov    (&DWP(32*18+12,"esp"),"ebp")    if ($i==0);
1373         &mov    ("ebp","eax")                   if ($i==0);
1374         &or     ("ebp","eax")                   if ($i!=0 && $i<64);
1375         &mov    (&DWP($i+4,"edi"),"ebx");
1376         &or     ("ebp","ebx")                   if ($i<64);
1377         &mov    (&DWP($i+8,"edi"),"ecx");
1378         &or     ("ebp","ecx")                   if ($i<64);
1379         &mov    (&DWP($i+12,"edi"),"edx");
1380         &or     ("ebp","edx")                   if ($i<64);
1381     }
1382         &xor    ("eax","eax");
1383         &mov    ("esi",&wparam(1));
1384         &sub    ("eax","ebp");
1385         &or     ("ebp","eax");
1386         &sar    ("ebp",31);
1387         &mov    (&DWP(32*18+4,"esp"),"ebp");    # !in2infty
1388
1389         &lea    ("edi",&DWP($in1_x,"esp"));
1390     for($i=0;$i<96;$i+=16) {
1391         &mov    ("eax",&DWP($i+0,"esi"));       # copy in1
1392         &mov    ("ebx",&DWP($i+4,"esi"));
1393         &mov    ("ecx",&DWP($i+8,"esi"));
1394         &mov    ("edx",&DWP($i+12,"esi"));
1395         &mov    (&DWP($i+0,"edi"),"eax");
1396         &mov    ("ebp","eax")                   if ($i==0);
1397         &or     ("ebp","eax")                   if ($i!=0 && $i<64);
1398         &mov    (&DWP($i+4,"edi"),"ebx");
1399         &or     ("ebp","ebx")                   if ($i<64);
1400         &mov    (&DWP($i+8,"edi"),"ecx");
1401         &or     ("ebp","ecx")                   if ($i<64);
1402         &mov    (&DWP($i+12,"edi"),"edx");
1403         &or     ("ebp","edx")                   if ($i<64);
1404     }
1405         &xor    ("eax","eax");
1406         &sub    ("eax","ebp");
1407         &or     ("ebp","eax");
1408         &sar    ("ebp",31);
1409         &mov    (&DWP(32*18+0,"esp"),"ebp");    # !in1infty
1410
1411         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1412         &lea    ("esi",&DWP($in2_z,"esp"));
1413         &lea    ("ebp",&DWP($in2_z,"esp"));
1414         &lea    ("edi",&DWP($Z2sqr,"esp"));
1415         &call   ("_ecp_nistz256_mul_mont");     # p256_sqr_mont(Z2sqr, in2_z);
1416
1417         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1418         &lea    ("esi",&DWP($in1_z,"esp"));
1419         &lea    ("ebp",&DWP($in1_z,"esp"));
1420         &lea    ("edi",&DWP($Z1sqr,"esp"));
1421         &call   ("_ecp_nistz256_mul_mont");     # p256_sqr_mont(Z1sqr, in1_z);
1422
1423         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1424         &lea    ("esi",&DWP($Z2sqr,"esp"));
1425         &lea    ("ebp",&DWP($in2_z,"esp"));
1426         &lea    ("edi",&DWP($S1,"esp"));
1427         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(S1, Z2sqr, in2_z);
1428
1429         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1430         &lea    ("esi",&DWP($Z1sqr,"esp"));
1431         &lea    ("ebp",&DWP($in1_z,"esp"));
1432         &lea    ("edi",&DWP($S2,"esp"));
1433         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(S2, Z1sqr, in1_z);
1434
1435         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1436         &lea    ("esi",&DWP($in1_y,"esp"));
1437         &lea    ("ebp",&DWP($S1,"esp"));
1438         &lea    ("edi",&DWP($S1,"esp"));
1439         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(S1, S1, in1_y);
1440
1441         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1442         &lea    ("esi",&DWP($in2_y,"esp"));
1443         &lea    ("ebp",&DWP($S2,"esp"));
1444         &lea    ("edi",&DWP($S2,"esp"));
1445         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(S2, S2, in2_y);
1446
1447         &lea    ("esi",&DWP($S2,"esp"));
1448         &lea    ("ebp",&DWP($S1,"esp"));
1449         &lea    ("edi",&DWP($R,"esp"));
1450         &call   ("_ecp_nistz256_sub");          # p256_sub(R, S2, S1);
1451
1452         &or     ("ebx","eax");                  # see if result is zero
1453         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1454         &or     ("ebx","ecx");
1455         &or     ("ebx","edx");
1456         &or     ("ebx",&DWP(0,"edi"));
1457         &or     ("ebx",&DWP(4,"edi"));
1458          &lea   ("esi",&DWP($in1_x,"esp"));
1459         &or     ("ebx",&DWP(8,"edi"));
1460          &lea   ("ebp",&DWP($Z2sqr,"esp"));
1461         &or     ("ebx",&DWP(12,"edi"));
1462          &lea   ("edi",&DWP($U1,"esp"));
1463         &mov    (&DWP(32*18+8,"esp"),"ebx");
1464
1465         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(U1, in1_x, Z2sqr);
1466
1467         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1468         &lea    ("esi",&DWP($in2_x,"esp"));
1469         &lea    ("ebp",&DWP($Z1sqr,"esp"));
1470         &lea    ("edi",&DWP($U2,"esp"));
1471         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(U2, in2_x, Z1sqr);
1472
1473         &lea    ("esi",&DWP($U2,"esp"));
1474         &lea    ("ebp",&DWP($U1,"esp"));
1475         &lea    ("edi",&DWP($H,"esp"));
1476         &call   ("_ecp_nistz256_sub");          # p256_sub(H, U2, U1);
1477
1478         &or     ("eax","ebx");                  # see if result is zero
1479         &or     ("eax","ecx");
1480         &or     ("eax","edx");
1481         &or     ("eax",&DWP(0,"edi"));
1482         &or     ("eax",&DWP(4,"edi"));
1483         &or     ("eax",&DWP(8,"edi"));
1484         &or     ("eax",&DWP(12,"edi"));
1485
1486         &data_byte(0x3e);                       # predict taken
1487         &jnz    (&label("add_proceed"));        # is_equal(U1,U2)?
1488
1489         &mov    ("eax",&DWP(32*18+0,"esp"));
1490         &and    ("eax",&DWP(32*18+4,"esp"));
1491         &mov    ("ebx",&DWP(32*18+8,"esp"));
1492         &jz     (&label("add_proceed"));        # (in1infty || in2infty)?
1493         &test   ("ebx","ebx");
1494         &jz     (&label("add_proceed"));        # is_equal(S1,S2)?
1495
1496         &mov    ("edi",&wparam(0));
1497         &xor    ("eax","eax");
1498         &mov    ("ecx",96/4);
1499         &data_byte(0xfc,0xf3,0xab);             # cld; stosd
1500         &jmp    (&label("add_done"));
1501
1502 &set_label("add_proceed",16);
1503         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1504         &lea    ("esi",&DWP($R,"esp"));
1505         &lea    ("ebp",&DWP($R,"esp"));
1506         &lea    ("edi",&DWP($Rsqr,"esp"));
1507         &call   ("_ecp_nistz256_mul_mont");     # p256_sqr_mont(Rsqr, R);
1508
1509         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1510         &lea    ("esi",&DWP($H,"esp"));
1511         &lea    ("ebp",&DWP($in1_z,"esp"));
1512         &lea    ("edi",&DWP($res_z,"esp"));
1513         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(res_z, H, in1_z);
1514
1515         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1516         &lea    ("esi",&DWP($H,"esp"));
1517         &lea    ("ebp",&DWP($H,"esp"));
1518         &lea    ("edi",&DWP($Hsqr,"esp"));
1519         &call   ("_ecp_nistz256_mul_mont");     # p256_sqr_mont(Hsqr, H);
1520
1521         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1522         &lea    ("esi",&DWP($in2_z,"esp"));
1523         &lea    ("ebp",&DWP($res_z,"esp"));
1524         &lea    ("edi",&DWP($res_z,"esp"));
1525         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(res_z, res_z, in2_z);
1526
1527         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1528         &lea    ("esi",&DWP($Hsqr,"esp"));
1529         &lea    ("ebp",&DWP($U1,"esp"));
1530         &lea    ("edi",&DWP($U2,"esp"));
1531         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(U2, U1, Hsqr);
1532
1533         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1534         &lea    ("esi",&DWP($H,"esp"));
1535         &lea    ("ebp",&DWP($Hsqr,"esp"));
1536         &lea    ("edi",&DWP($Hcub,"esp"));
1537         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(Hcub, Hsqr, H);
1538
1539         &lea    ("esi",&DWP($U2,"esp"));
1540         &lea    ("ebp",&DWP($U2,"esp"));
1541         &lea    ("edi",&DWP($Hsqr,"esp"));
1542         &call   ("_ecp_nistz256_add");          # p256_mul_by_2(Hsqr, U2);
1543
1544         &lea    ("esi",&DWP($Rsqr,"esp"));
1545         &lea    ("ebp",&DWP($Hsqr,"esp"));
1546         &lea    ("edi",&DWP($res_x,"esp"));
1547         &call   ("_ecp_nistz256_sub");          # p256_sub(res_x, Rsqr, Hsqr);
1548
1549         &lea    ("esi",&DWP($res_x,"esp"));
1550         &lea    ("ebp",&DWP($Hcub,"esp"));
1551         &lea    ("edi",&DWP($res_x,"esp"));
1552         &call   ("_ecp_nistz256_sub");          # p256_sub(res_x, res_x, Hcub);
1553
1554         &lea    ("esi",&DWP($U2,"esp"));
1555         &lea    ("ebp",&DWP($res_x,"esp"));
1556         &lea    ("edi",&DWP($res_y,"esp"));
1557         &call   ("_ecp_nistz256_sub");          # p256_sub(res_y, U2, res_x);
1558
1559         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1560         &lea    ("esi",&DWP($Hcub,"esp"));
1561         &lea    ("ebp",&DWP($S1,"esp"));
1562         &lea    ("edi",&DWP($S2,"esp"));
1563         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(S2, S1, Hcub);
1564
1565         &mov    ("eax",&DWP(32*18+12,"esp"));   # OPENSSL_ia32cap_P copy
1566         &lea    ("esi",&DWP($R,"esp"));
1567         &lea    ("ebp",&DWP($res_y,"esp"));
1568         &lea    ("edi",&DWP($res_y,"esp"));
1569         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(res_y, R, res_y);
1570
1571         &lea    ("esi",&DWP($res_y,"esp"));
1572         &lea    ("ebp",&DWP($S2,"esp"));
1573         &lea    ("edi",&DWP($res_y,"esp"));
1574         &call   ("_ecp_nistz256_sub");          # p256_sub(res_y, res_y, S2);
1575
1576         &mov    ("ebp",&DWP(32*18+0,"esp"));    # !in1infty
1577         &mov    ("esi",&DWP(32*18+4,"esp"));    # !in2infty
1578         &mov    ("edi",&wparam(0));
1579         &mov    ("edx","ebp");
1580         &not    ("ebp");
1581         &and    ("edx","esi");
1582         &and    ("ebp","esi");
1583         &not    ("esi");
1584
1585         ########################################
1586         # conditional moves
1587     for($i=64;$i<96;$i+=4) {
1588         &mov    ("eax","edx");
1589         &and    ("eax",&DWP($res_x+$i,"esp"));
1590         &mov    ("ebx","ebp");
1591         &and    ("ebx",&DWP($in2_x+$i,"esp"));
1592         &mov    ("ecx","esi");
1593         &and    ("ecx",&DWP($in1_x+$i,"esp"));
1594         &or     ("eax","ebx");
1595         &or     ("eax","ecx");
1596         &mov    (&DWP($i,"edi"),"eax");
1597     }
1598     for($i=0;$i<64;$i+=4) {
1599         &mov    ("eax","edx");
1600         &and    ("eax",&DWP($res_x+$i,"esp"));
1601         &mov    ("ebx","ebp");
1602         &and    ("ebx",&DWP($in2_x+$i,"esp"));
1603         &mov    ("ecx","esi");
1604         &and    ("ecx",&DWP($in1_x+$i,"esp"));
1605         &or     ("eax","ebx");
1606         &or     ("eax","ecx");
1607         &mov    (&DWP($i,"edi"),"eax");
1608     }
1609     &set_label("add_done");
1610         &stack_pop(8*18+5);
1611 } &function_end("ecp_nistz256_point_add");
1612
1613 ########################################################################
1614 # void ecp_nistz256_point_add_affine(P256_POINT *out,
1615 #                                    const P256_POINT *in1,
1616 #                                    const P256_POINT_AFFINE *in2);
1617 &function_begin("ecp_nistz256_point_add_affine");
1618 {
1619     my ($res_x,$res_y,$res_z,
1620         $in1_x,$in1_y,$in1_z,
1621         $in2_x,$in2_y,
1622         $U2,$S2,$H,$R,$Hsqr,$Hcub,$Rsqr)=map(32*$_,(0..14));
1623     my $Z1sqr = $S2;
1624     my @ONE_mont=(1,0,0,-1,-1,-1,-2,0);
1625
1626         &mov    ("esi",&wparam(1));
1627
1628         # above map() describes stack layout with 15 temporary
1629         # 256-bit vectors on top, then we take extra words for
1630         # !in1infty, !in2infty, and OPENSSL_ia32cap_P copy.
1631         &stack_push(8*15+3);
1632                                                 if ($sse2) {
1633         &call   ("_picup_eax");
1634     &set_label("pic");
1635         &picmeup("edx","OPENSSL_ia32cap_P","eax",&label("pic"));
1636         &mov    ("ebp",&DWP(0,"edx"));          }
1637
1638         &lea    ("edi",&DWP($in1_x,"esp"));
1639     for($i=0;$i<96;$i+=16) {
1640         &mov    ("eax",&DWP($i+0,"esi"));       # copy in1
1641         &mov    ("ebx",&DWP($i+4,"esi"));
1642         &mov    ("ecx",&DWP($i+8,"esi"));
1643         &mov    ("edx",&DWP($i+12,"esi"));
1644         &mov    (&DWP($i+0,"edi"),"eax");
1645         &mov    (&DWP(32*15+8,"esp"),"ebp")     if ($i==0);
1646         &mov    ("ebp","eax")                   if ($i==0);
1647         &or     ("ebp","eax")                   if ($i!=0 && $i<64);
1648         &mov    (&DWP($i+4,"edi"),"ebx");
1649         &or     ("ebp","ebx")                   if ($i<64);
1650         &mov    (&DWP($i+8,"edi"),"ecx");
1651         &or     ("ebp","ecx")                   if ($i<64);
1652         &mov    (&DWP($i+12,"edi"),"edx");
1653         &or     ("ebp","edx")                   if ($i<64);
1654     }
1655         &xor    ("eax","eax");
1656         &mov    ("esi",&wparam(2));
1657         &sub    ("eax","ebp");
1658         &or     ("ebp","eax");
1659         &sar    ("ebp",31);
1660         &mov    (&DWP(32*15+0,"esp"),"ebp");    # !in1infty
1661
1662         &lea    ("edi",&DWP($in2_x,"esp"));
1663     for($i=0;$i<64;$i+=16) {
1664         &mov    ("eax",&DWP($i+0,"esi"));       # copy in2
1665         &mov    ("ebx",&DWP($i+4,"esi"));
1666         &mov    ("ecx",&DWP($i+8,"esi"));
1667         &mov    ("edx",&DWP($i+12,"esi"));
1668         &mov    (&DWP($i+0,"edi"),"eax");
1669         &mov    ("ebp","eax")                   if ($i==0);
1670         &or     ("ebp","eax")                   if ($i!=0);
1671         &mov    (&DWP($i+4,"edi"),"ebx");
1672         &or     ("ebp","ebx");
1673         &mov    (&DWP($i+8,"edi"),"ecx");
1674         &or     ("ebp","ecx");
1675         &mov    (&DWP($i+12,"edi"),"edx");
1676         &or     ("ebp","edx");
1677     }
1678         &xor    ("ebx","ebx");
1679         &mov    ("eax",&DWP(32*15+8,"esp"));    # OPENSSL_ia32cap_P copy
1680         &sub    ("ebx","ebp");
1681          &lea   ("esi",&DWP($in1_z,"esp"));
1682         &or     ("ebx","ebp");
1683          &lea   ("ebp",&DWP($in1_z,"esp"));
1684         &sar    ("ebx",31);
1685          &lea   ("edi",&DWP($Z1sqr,"esp"));
1686         &mov    (&DWP(32*15+4,"esp"),"ebx");    # !in2infty
1687
1688         &call   ("_ecp_nistz256_mul_mont");     # p256_sqr_mont(Z1sqr, in1_z);
1689
1690         &mov    ("eax",&DWP(32*15+8,"esp"));    # OPENSSL_ia32cap_P copy
1691         &lea    ("esi",&DWP($in2_x,"esp"));
1692         &mov    ("ebp","edi");                  # %esi is stull &Z1sqr
1693         &lea    ("edi",&DWP($U2,"esp"));
1694         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(U2, Z1sqr, in2_x);
1695
1696         &mov    ("eax",&DWP(32*15+8,"esp"));    # OPENSSL_ia32cap_P copy
1697         &lea    ("esi",&DWP($in1_z,"esp"));
1698         &lea    ("ebp",&DWP($Z1sqr,"esp"));
1699         &lea    ("edi",&DWP($S2,"esp"));
1700         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(S2, Z1sqr, in1_z);
1701
1702         &lea    ("esi",&DWP($U2,"esp"));
1703         &lea    ("ebp",&DWP($in1_x,"esp"));
1704         &lea    ("edi",&DWP($H,"esp"));
1705         &call   ("_ecp_nistz256_sub");          # p256_sub(H, U2, in1_x);
1706
1707         &mov    ("eax",&DWP(32*15+8,"esp"));    # OPENSSL_ia32cap_P copy
1708         &lea    ("esi",&DWP($in2_y,"esp"));
1709         &lea    ("ebp",&DWP($S2,"esp"));
1710         &lea    ("edi",&DWP($S2,"esp"));
1711         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(S2, S2, in2_y);
1712
1713         &mov    ("eax",&DWP(32*15+8,"esp"));    # OPENSSL_ia32cap_P copy
1714         &lea    ("esi",&DWP($in1_z,"esp"));
1715         &lea    ("ebp",&DWP($H,"esp"));
1716         &lea    ("edi",&DWP($res_z,"esp"));
1717         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(res_z, H, in1_z);
1718
1719         &lea    ("esi",&DWP($S2,"esp"));
1720         &lea    ("ebp",&DWP($in1_y,"esp"));
1721         &lea    ("edi",&DWP($R,"esp"));
1722         &call   ("_ecp_nistz256_sub");          # p256_sub(R, S2, in1_y);
1723
1724         &mov    ("eax",&DWP(32*15+8,"esp"));    # OPENSSL_ia32cap_P copy
1725         &lea    ("esi",&DWP($H,"esp"));
1726         &lea    ("ebp",&DWP($H,"esp"));
1727         &lea    ("edi",&DWP($Hsqr,"esp"));
1728         &call   ("_ecp_nistz256_mul_mont");     # p256_sqr_mont(Hsqr, H);
1729
1730         &mov    ("eax",&DWP(32*15+8,"esp"));    # OPENSSL_ia32cap_P copy
1731         &lea    ("esi",&DWP($R,"esp"));
1732         &lea    ("ebp",&DWP($R,"esp"));
1733         &lea    ("edi",&DWP($Rsqr,"esp"));
1734         &call   ("_ecp_nistz256_mul_mont");     # p256_sqr_mont(Rsqr, R);
1735
1736         &mov    ("eax",&DWP(32*15+8,"esp"));    # OPENSSL_ia32cap_P copy
1737         &lea    ("esi",&DWP($in1_x,"esp"));
1738         &lea    ("ebp",&DWP($Hsqr,"esp"));
1739         &lea    ("edi",&DWP($U2,"esp"));
1740         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(U2, in1_x, Hsqr);
1741
1742         &mov    ("eax",&DWP(32*15+8,"esp"));    # OPENSSL_ia32cap_P copy
1743         &lea    ("esi",&DWP($H,"esp"));
1744         &lea    ("ebp",&DWP($Hsqr,"esp"));
1745         &lea    ("edi",&DWP($Hcub,"esp"));
1746         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(Hcub, Hsqr, H);
1747
1748         &lea    ("esi",&DWP($U2,"esp"));
1749         &lea    ("ebp",&DWP($U2,"esp"));
1750         &lea    ("edi",&DWP($Hsqr,"esp"));
1751         &call   ("_ecp_nistz256_add");          # p256_mul_by_2(Hsqr, U2);
1752
1753         &lea    ("esi",&DWP($Rsqr,"esp"));
1754         &lea    ("ebp",&DWP($Hsqr,"esp"));
1755         &lea    ("edi",&DWP($res_x,"esp"));
1756         &call   ("_ecp_nistz256_sub");          # p256_sub(res_x, Rsqr, Hsqr);
1757
1758         &lea    ("esi",&DWP($res_x,"esp"));
1759         &lea    ("ebp",&DWP($Hcub,"esp"));
1760         &lea    ("edi",&DWP($res_x,"esp"));
1761         &call   ("_ecp_nistz256_sub");          # p256_sub(res_x, res_x, Hcub);
1762
1763         &lea    ("esi",&DWP($U2,"esp"));
1764         &lea    ("ebp",&DWP($res_x,"esp"));
1765         &lea    ("edi",&DWP($res_y,"esp"));
1766         &call   ("_ecp_nistz256_sub");          # p256_sub(res_y, U2, res_x);
1767
1768         &mov    ("eax",&DWP(32*15+8,"esp"));    # OPENSSL_ia32cap_P copy
1769         &lea    ("esi",&DWP($Hcub,"esp"));
1770         &lea    ("ebp",&DWP($in1_y,"esp"));
1771         &lea    ("edi",&DWP($S2,"esp"));
1772         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(S2, Hcub, in1_y);
1773
1774         &mov    ("eax",&DWP(32*15+8,"esp"));    # OPENSSL_ia32cap_P copy
1775         &lea    ("esi",&DWP($R,"esp"));
1776         &lea    ("ebp",&DWP($res_y,"esp"));
1777         &lea    ("edi",&DWP($res_y,"esp"));
1778         &call   ("_ecp_nistz256_mul_mont");     # p256_mul_mont(res_y, res_y, R);
1779
1780         &lea    ("esi",&DWP($res_y,"esp"));
1781         &lea    ("ebp",&DWP($S2,"esp"));
1782         &lea    ("edi",&DWP($res_y,"esp"));
1783         &call   ("_ecp_nistz256_sub");          # p256_sub(res_y, res_y, S2);
1784
1785         &mov    ("ebp",&DWP(32*15+0,"esp"));    # !in1infty
1786         &mov    ("esi",&DWP(32*15+4,"esp"));    # !in2infty
1787         &mov    ("edi",&wparam(0));
1788         &mov    ("edx","ebp");
1789         &not    ("ebp");
1790         &and    ("edx","esi");
1791         &and    ("ebp","esi");
1792         &not    ("esi");
1793
1794         ########################################
1795         # conditional moves
1796     for($i=64;$i<96;$i+=4) {
1797         my $one=@ONE_mont[($i-64)/4];
1798
1799         &mov    ("eax","edx");
1800         &and    ("eax",&DWP($res_x+$i,"esp"));
1801         &mov    ("ebx","ebp")                   if ($one && $one!=-1);
1802         &and    ("ebx",$one)                    if ($one && $one!=-1);
1803         &mov    ("ecx","esi");
1804         &and    ("ecx",&DWP($in1_x+$i,"esp"));
1805         &or     ("eax",$one==-1?"ebp":"ebx")    if ($one);
1806         &or     ("eax","ecx");
1807         &mov    (&DWP($i,"edi"),"eax");
1808     }
1809     for($i=0;$i<64;$i+=4) {
1810         &mov    ("eax","edx");
1811         &and    ("eax",&DWP($res_x+$i,"esp"));
1812         &mov    ("ebx","ebp");
1813         &and    ("ebx",&DWP($in2_x+$i,"esp"));
1814         &mov    ("ecx","esi");
1815         &and    ("ecx",&DWP($in1_x+$i,"esp"));
1816         &or     ("eax","ebx");
1817         &or     ("eax","ecx");
1818         &mov    (&DWP($i,"edi"),"eax");
1819     }
1820         &stack_pop(8*15+3);
1821 } &function_end("ecp_nistz256_point_add_affine");
1822
1823 &asm_finish();