release/src/router/openssl/crypto/bn/asm/alpha-mont.pl

   1 #!/usr/bin/env perl
   2 #
   3 # ====================================================================
   4 # Written by Andy Polyakov <appro@fy.chalmers.se> 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 # On 21264 RSA sign performance improves by 70/35/20/15 percent for
  11 # 512/1024/2048/4096 bit key lengths. This is against vendor compiler
  12 # instructed to '-tune host' code with in-line assembler. Other
  13 # benchmarks improve by 15-20%. To anchor it to something else, the
  14 # code provides approximately the same performance per GHz as AMD64.
  15 # I.e. if you compare 1GHz 21264 and 2GHz Opteron, you'll observe ~2x
  16 # difference.
  17
  18 # int bn_mul_mont(
  19 $rp="a0";       # BN_ULONG *rp,
  20 $ap="a1";       # const BN_ULONG *ap,
  21 $bp="a2";       # const BN_ULONG *bp,
  22 $np="a3";       # const BN_ULONG *np,
  23 $n0="a4";       # const BN_ULONG *n0,
  24 $num="a5";      # int num);
  25
  26 $lo0="t0";
  27 $hi0="t1";
  28 $lo1="t2";
  29 $hi1="t3";
  30 $aj="t4";
  31 $bi="t5";
  32 $nj="t6";
  33 $tp="t7";
  34 $alo="t8";
  35 $ahi="t9";
  36 $nlo="t10";
  37 $nhi="t11";
  38 $tj="t12";
  39 $i="s3";
  40 $j="s4";
  41 $m1="s5";
  42
  43 $code=<<___;
  44 #ifdef __linux__
  45 #include <asm/regdef.h>
  46 #else
  47 #include <asm.h>
  48 #include <regdef.h>
  49 #endif
  50
  51 .text
  52
  53 .set    noat
  54 .set    noreorder
  55
  56 .globl  bn_mul_mont
  57 .align  5
  58 .ent    bn_mul_mont
  59 bn_mul_mont:
  60         lda     sp,-48(sp)
  61         stq     ra,0(sp)
  62         stq     s3,8(sp)
  63         stq     s4,16(sp)
  64         stq     s5,24(sp)
  65         stq     fp,32(sp)
  66         mov     sp,fp
  67         .mask   0x0400f000,-48
  68         .frame  fp,48,ra
  69         .prologue 0
  70
  71         .align  4
  72         .set    reorder
  73         sextl   $num,$num
  74         mov     0,v0
  75         cmplt   $num,4,AT
  76         bne     AT,.Lexit
  77
  78         ldq     $hi0,0($ap)     # ap[0]
  79         s8addq  $num,16,AT
  80         ldq     $aj,8($ap)
  81         subq    sp,AT,sp
  82         ldq     $bi,0($bp)      # bp[0]
  83         lda     AT,-4096(zero)  # mov   -4096,AT
  84         ldq     $n0,0($n0)
  85         and     sp,AT,sp
  86
  87         mulq    $hi0,$bi,$lo0
  88         ldq     $hi1,0($np)     # np[0]
  89         umulh   $hi0,$bi,$hi0
  90         ldq     $nj,8($np)
  91
  92         mulq    $lo0,$n0,$m1
  93
  94         mulq    $hi1,$m1,$lo1
  95         umulh   $hi1,$m1,$hi1
  96
  97         addq    $lo1,$lo0,$lo1
  98         cmpult  $lo1,$lo0,AT
  99         addq    $hi1,AT,$hi1
 100
 101         mulq    $aj,$bi,$alo
 102         mov     2,$j
 103         umulh   $aj,$bi,$ahi
 104         mov     sp,$tp
 105
 106         mulq    $nj,$m1,$nlo
 107         s8addq  $j,$ap,$aj
 108         umulh   $nj,$m1,$nhi
 109         s8addq  $j,$np,$nj
 110 .align  4
 111 .L1st:
 112         .set    noreorder
 113         ldq     $aj,0($aj)
 114         addl    $j,1,$j
 115         ldq     $nj,0($nj)
 116         lda     $tp,8($tp)
 117
 118         addq    $alo,$hi0,$lo0
 119         mulq    $aj,$bi,$alo
 120         cmpult  $lo0,$hi0,AT
 121         addq    $nlo,$hi1,$lo1
 122
 123         mulq    $nj,$m1,$nlo
 124         addq    $ahi,AT,$hi0
 125         cmpult  $lo1,$hi1,v0
 126         cmplt   $j,$num,$tj
 127
 128         umulh   $aj,$bi,$ahi
 129         addq    $nhi,v0,$hi1
 130         addq    $lo1,$lo0,$lo1
 131         s8addq  $j,$ap,$aj
 132
 133         umulh   $nj,$m1,$nhi
 134         cmpult  $lo1,$lo0,v0
 135         addq    $hi1,v0,$hi1
 136         s8addq  $j,$np,$nj
 137
 138         stq     $lo1,-8($tp)
 139         nop
 140         unop
 141         bne     $tj,.L1st
 142         .set    reorder
 143
 144         addq    $alo,$hi0,$lo0
 145         addq    $nlo,$hi1,$lo1
 146         cmpult  $lo0,$hi0,AT
 147         cmpult  $lo1,$hi1,v0
 148         addq    $ahi,AT,$hi0
 149         addq    $nhi,v0,$hi1
 150
 151         addq    $lo1,$lo0,$lo1
 152         cmpult  $lo1,$lo0,v0
 153         addq    $hi1,v0,$hi1
 154
 155         stq     $lo1,0($tp)
 156
 157         addq    $hi1,$hi0,$hi1
 158         cmpult  $hi1,$hi0,AT
 159         stq     $hi1,8($tp)
 160         stq     AT,16($tp)
 161
 162         mov     1,$i
 163 .align  4
 164 .Louter:
 165         s8addq  $i,$bp,$bi
 166         ldq     $hi0,0($ap)
 167         ldq     $aj,8($ap)
 168         ldq     $bi,0($bi)
 169         ldq     $hi1,0($np)
 170         ldq     $nj,8($np)
 171         ldq     $tj,0(sp)
 172
 173         mulq    $hi0,$bi,$lo0
 174         umulh   $hi0,$bi,$hi0
 175
 176         addq    $lo0,$tj,$lo0
 177         cmpult  $lo0,$tj,AT
 178         addq    $hi0,AT,$hi0
 179
 180         mulq    $lo0,$n0,$m1
 181
 182         mulq    $hi1,$m1,$lo1
 183         umulh   $hi1,$m1,$hi1
 184
 185         addq    $lo1,$lo0,$lo1
 186         cmpult  $lo1,$lo0,AT
 187         mov     2,$j
 188         addq    $hi1,AT,$hi1
 189
 190         mulq    $aj,$bi,$alo
 191         mov     sp,$tp
 192         umulh   $aj,$bi,$ahi
 193
 194         mulq    $nj,$m1,$nlo
 195         s8addq  $j,$ap,$aj
 196         umulh   $nj,$m1,$nhi
 197 .align  4
 198 .Linner:
 199         .set    noreorder
 200         ldq     $tj,8($tp)      #L0
 201         nop                     #U1
 202         ldq     $aj,0($aj)      #L1
 203         s8addq  $j,$np,$nj      #U0
 204
 205         ldq     $nj,0($nj)      #L0
 206         nop                     #U1
 207         addq    $alo,$hi0,$lo0  #L1
 208         lda     $tp,8($tp)
 209
 210         mulq    $aj,$bi,$alo    #U1
 211         cmpult  $lo0,$hi0,AT    #L0
 212         addq    $nlo,$hi1,$lo1  #L1
 213         addl    $j,1,$j
 214
 215         mulq    $nj,$m1,$nlo    #U1
 216         addq    $ahi,AT,$hi0    #L0
 217         addq    $lo0,$tj,$lo0   #L1
 218         cmpult  $lo1,$hi1,v0    #U0
 219
 220         umulh   $aj,$bi,$ahi    #U1
 221         cmpult  $lo0,$tj,AT     #L0
 222         addq    $lo1,$lo0,$lo1  #L1
 223         addq    $nhi,v0,$hi1    #U0
 224
 225         umulh   $nj,$m1,$nhi    #U1
 226         s8addq  $j,$ap,$aj      #L0
 227         cmpult  $lo1,$lo0,v0    #L1
 228         cmplt   $j,$num,$tj     #U0     # borrow $tj
 229
 230         addq    $hi0,AT,$hi0    #L0
 231         addq    $hi1,v0,$hi1    #U1
 232         stq     $lo1,-8($tp)    #L1
 233         bne     $tj,.Linner     #U0
 234         .set    reorder
 235
 236         ldq     $tj,8($tp)
 237         addq    $alo,$hi0,$lo0
 238         addq    $nlo,$hi1,$lo1
 239         cmpult  $lo0,$hi0,AT
 240         cmpult  $lo1,$hi1,v0
 241         addq    $ahi,AT,$hi0
 242         addq    $nhi,v0,$hi1
 243
 244         addq    $lo0,$tj,$lo0
 245         cmpult  $lo0,$tj,AT
 246         addq    $hi0,AT,$hi0
 247
 248         ldq     $tj,16($tp)
 249         addq    $lo1,$lo0,$j
 250         cmpult  $j,$lo0,v0
 251         addq    $hi1,v0,$hi1
 252
 253         addq    $hi1,$hi0,$lo1
 254         stq     $j,0($tp)
 255         cmpult  $lo1,$hi0,$hi1
 256         addq    $lo1,$tj,$lo1
 257         cmpult  $lo1,$tj,AT
 258         addl    $i,1,$i
 259         addq    $hi1,AT,$hi1
 260         stq     $lo1,8($tp)
 261         cmplt   $i,$num,$tj     # borrow $tj
 262         stq     $hi1,16($tp)
 263         bne     $tj,.Louter
 264 \f
 265         s8addq  $num,sp,$tj     # &tp[num]
 266         mov     $rp,$bp         # put rp aside
 267         mov     sp,$tp
 268         mov     sp,$ap
 269         mov     0,$hi0          # clear borrow bit
 270
 271 .align  4
 272 .Lsub:  ldq     $lo0,0($tp)
 273         ldq     $lo1,0($np)
 274         lda     $tp,8($tp)
 275         lda     $np,8($np)
 276         subq    $lo0,$lo1,$lo1  # tp[i]-np[i]
 277         cmpult  $lo0,$lo1,AT
 278         subq    $lo1,$hi0,$lo0
 279         cmpult  $lo1,$lo0,$hi0
 280         or      $hi0,AT,$hi0
 281         stq     $lo0,0($rp)
 282         cmpult  $tp,$tj,v0
 283         lda     $rp,8($rp)
 284         bne     v0,.Lsub
 285
 286         subq    $hi1,$hi0,$hi0  # handle upmost overflow bit
 287         mov     sp,$tp
 288         mov     $bp,$rp         # restore rp
 289
 290         and     sp,$hi0,$ap
 291         bic     $bp,$hi0,$bp
 292         bis     $bp,$ap,$ap     # ap=borrow?tp:rp
 293
 294 .align  4
 295 .Lcopy: ldq     $aj,0($ap)      # copy or in-place refresh
 296         lda     $tp,8($tp)
 297         lda     $rp,8($rp)
 298         lda     $ap,8($ap)
 299         stq     zero,-8($tp)    # zap tp
 300         cmpult  $tp,$tj,AT
 301         stq     $aj,-8($rp)
 302         bne     AT,.Lcopy
 303         mov     1,v0
 304
 305 .Lexit:
 306         .set    noreorder
 307         mov     fp,sp
 308         /*ldq   ra,0(sp)*/
 309         ldq     s3,8(sp)
 310         ldq     s4,16(sp)
 311         ldq     s5,24(sp)
 312         ldq     fp,32(sp)
 313         lda     sp,48(sp)
 314         ret     (ra)
 315 .end    bn_mul_mont
 316 .ascii  "Montgomery Multiplication for Alpha, CRYPTOGAMS by <appro\@openssl.org>"
 317 .align  2
 318 ___
 319
 320 print $code;
 321 close STDOUT;