crypto/bn/asm/alpha/sub.pl

   1 #!/usr/local/bin/perl
   2 # alpha assember
   3
   4 sub bn_sub_words
   5         {
   6         local($name)=@_;
   7         local($cc,$a,$b,$r);
   8
   9         &init_pool(4);
  10         ($cc)=GR("r0");
  11
  12         $rp=&wparam(0);
  13         $ap=&wparam(1);
  14         $bp=&wparam(2);
  15         $count=&wparam(3);
  16
  17         &function_begin($name,"");
  18
  19         &comment("");
  20         &sub($count,4,$count);
  21         &mov("zero",$cc);
  22         &blt($count,&label("finish"));
  23
  24         ($a0,$b0)=&NR(2);
  25         &ld($a0,&QWPw(0,$ap));
  26         &ld($b0,&QWPw(0,$bp));
  27
  28 ##########################################################
  29         &set_label("loop");
  30
  31         ($a1,$tmp,$b1,$a2,$b2,$a3,$b3,$o0)=&NR(8);
  32         &ld($a1,&QWPw(1,$ap));
  33          &cmpult($a0,$b0,$tmp); # will we borrow?
  34         &ld($b1,&QWPw(1,$bp));
  35          &sub($a0,$b0,$a0);             # do the subtract
  36         &ld($a2,&QWPw(2,$ap));
  37          &cmpult($a0,$cc,$b0);  # will we borrow?
  38         &ld($b2,&QWPw(2,$bp));
  39          &sub($a0,$cc,$o0);     # will we borrow?
  40         &ld($a3,&QWPw(3,$ap));
  41          &add($b0,$tmp,$cc); ($t1,$o1)=&NR(2); &FR($tmp);
  42
  43         &cmpult($a1,$b1,$t1);   # will we borrow?
  44          &sub($a1,$b1,$a1);     # do the subtract
  45         &ld($b3,&QWPw(3,$bp));
  46          &cmpult($a1,$cc,$b1);  # will we borrow?
  47         &sub($a1,$cc,$o1);      # will we borrow?
  48          &add($b1,$t1,$cc); ($tmp,$o2)=&NR(2); &FR($t1,$a1,$b1);
  49
  50         &cmpult($a2,$b2,$tmp);  # will we borrow?
  51          &sub($a2,$b2,$a2);             # do the subtract
  52         &st($o0,&QWPw(0,$rp));  &FR($o0); # save
  53          &cmpult($a2,$cc,$b2);  # will we borrow?
  54         &sub($a2,$cc,$o2);      # will we borrow?
  55          &add($b2,$tmp,$cc); ($t3,$o3)=&NR(2); &FR($tmp,$a2,$b2);
  56
  57         &cmpult($a3,$b3,$t3);   # will we borrow?
  58          &sub($a3,$b3,$a3);     # do the subtract
  59         &st($o1,&QWPw(1,$rp)); &FR($o1);
  60          &cmpult($a3,$cc,$b3);  # will we borrow?
  61         &sub($a3,$cc,$o3);      # will we borrow?
  62          &add($b3,$t3,$cc); &FR($t3,$a3,$b3);
  63
  64         &st($o2,&QWPw(2,$rp));  &FR($o2);
  65          &sub($count,4,$count); # count-=4
  66         &st($o3,&QWPw(3,$rp));  &FR($o3);
  67          &add($ap,4*$QWS,$ap);  # count+=4
  68         &add($bp,4*$QWS,$bp);   # count+=4
  69          &add($rp,4*$QWS,$rp);  # count+=4
  70
  71         &blt($count,&label("finish"));
  72         &ld($a0,&QWPw(0,$ap));
  73          &ld($b0,&QWPw(0,$bp));
  74         &br(&label("loop"));
  75 ##################################################
  76         # Do the last 0..3 words
  77
  78         &set_label("last_loop");
  79
  80         &ld($a0,&QWPw(0,$ap));  # get a
  81          &ld($b0,&QWPw(0,$bp)); # get b
  82         &cmpult($a0,$b0,$tmp);  # will we borrow?
  83         &sub($a0,$b0,$a0);      # do the subtract
  84         &cmpult($a0,$cc,$b0);   # will we borrow?
  85         &sub($a0,$cc,$a0);      # will we borrow?
  86         &st($a0,&QWPw(0,$rp));  # save
  87         &add($b0,$tmp,$cc);     # add the borrows
  88
  89         &add($ap,$QWS,$ap);
  90         &add($bp,$QWS,$bp);
  91         &add($rp,$QWS,$rp);
  92         &sub($count,1,$count);
  93         &bgt($count,&label("last_loop"));
  94         &function_end_A($name);
  95
  96 ######################################################
  97         &set_label("finish");
  98         &add($count,4,$count);
  99         &bgt($count,&label("last_loop"));
 100
 101         &FR($a0,$b0);
 102         &set_label("end");
 103         &function_end($name);
 104
 105         &fin_pool;
 106         }
 107
 108 1;