crypto/bn/asm/co-alpha.pl

   1 #!/usr/local/bin/perl
   2 # I have this in perl so I can use more usefull register names and then convert
   3 # them into alpha registers.
   4 #
   5
   6 push(@INC,"perlasm","../../perlasm");
   7 require "alpha.pl";
   8
   9 &asm_init($ARGV[0],$0);
  10
  11 print &bn_sub_words("bn_sub_words");
  12
  13 &asm_finish();
  14
  15 sub bn_sub_words
  16         {
  17         local($name)=@_;
  18         local($cc,$a,$b,$r);
  19
  20         $cc="r0";
  21         $a0="r1"; $b0="r5"; $r0="r9";  $tmp="r13";
  22         $a1="r2"; $b1="r6"; $r1="r10"; $t1="r14";
  23         $a2="r3"; $b2="r7"; $r2="r11";
  24         $a3="r4"; $b3="r8"; $r3="r12"; $t3="r15";
  25
  26         $rp=&wparam(0);
  27         $ap=&wparam(1);
  28         $bp=&wparam(2);
  29         $count=&wparam(3);
  30
  31         &function_begin($name,"");
  32
  33         &comment("");
  34         &sub($count,4,$count);
  35         &mov("zero",$cc);
  36         &blt($count,&label("finish"));
  37
  38         &ld($a0,&QWPw(0,$ap));
  39         &ld($b0,&QWPw(0,$bp));
  40
  41 ##########################################################
  42         &set_label("loop");
  43
  44         &ld($a1,&QWPw(1,$ap));
  45          &cmpult($a0,$b0,$tmp); # will we borrow?
  46         &ld($b1,&QWPw(1,$bp));
  47          &sub($a0,$b0,$a0);             # do the subtract
  48         &ld($a2,&QWPw(2,$ap));
  49          &cmpult($a0,$cc,$b0);  # will we borrow?
  50         &ld($b2,&QWPw(2,$bp));
  51          &sub($a0,$cc,$a0);     # will we borrow?
  52         &ld($a3,&QWPw(3,$ap));
  53          &add($b0,$tmp,$cc);    # add the borrows
  54
  55         &cmpult($a1,$b1,$t1);   # will we borrow?
  56          &sub($a1,$b1,$a1);     # do the subtract
  57         &ld($b3,&QWPw(3,$bp));
  58          &cmpult($a1,$cc,$b1);  # will we borrow?
  59         &sub($a1,$cc,$a1);      # will we borrow?
  60          &add($b1,$t1,$cc);     # add the borrows
  61
  62         &cmpult($a2,$b2,$tmp);  # will we borrow?
  63          &sub($a2,$b2,$a2);             # do the subtract
  64         &st($a0,&QWPw(0,$rp));  # save
  65          &cmpult($a2,$cc,$b2);  # will we borrow?
  66         &sub($a2,$cc,$a2);      # will we borrow?
  67          &add($b2,$tmp,$cc);    # add the borrows
  68
  69         &cmpult($a3,$b3,$t3);   # will we borrow?
  70          &sub($a3,$b3,$a3);             # do the subtract
  71         &st($a1,&QWPw(1,$rp));  # save
  72          &cmpult($a3,$cc,$b3);  # will we borrow?
  73         &sub($a3,$cc,$a3);      # will we borrow?
  74          &add($b3,$t3,$cc);     # add the borrows
  75
  76         &st($a2,&QWPw(2,$rp));  # save
  77          &sub($count,4,$count); # count-=4
  78         &st($a3,&QWPw(3,$rp));  # save
  79          &add($ap,4*$QWS,$ap);  # count+=4
  80         &add($bp,4*$QWS,$bp);   # count+=4
  81          &add($rp,4*$QWS,$rp);  # count+=4
  82
  83         &blt($count,&label("finish"));
  84         &ld($a0,&QWPw(0,$ap));
  85          &ld($b0,&QWPw(0,$bp));
  86         &br(&label("loop"));
  87 ##################################################
  88         # Do the last 0..3 words
  89
  90         &set_label("last_loop");
  91
  92         &ld($a0,&QWPw(0,$ap));  # get a
  93          &ld($b0,&QWPw(0,$bp)); # get b
  94         &cmpult($a0,$b0,$tmp);  # will we borrow?
  95         &sub($a0,$b0,$a0);      # do the subtract
  96         &cmpult($a0,$cc,$b0);   # will we borrow?
  97         &sub($a0,$cc,$a0);      # will we borrow?
  98         &st($a0,&QWPw(0,$rp));  # save
  99         &add($b0,$tmp,$cc);     # add the borrows
 100
 101         &add($ap,$QWS,$ap);
 102         &add($bp,$QWS,$bp);
 103         &add($rp,$QWS,$rp);
 104         &sub($count,1,$count);
 105         &bgt($count,&label("last_loop"));
 106         &function_end_A($name);
 107
 108 ######################################################
 109         &set_label("finish");
 110         &add($count,4,$count);
 111         &bgt($count,&label("last_loop"));
 112
 113         &set_label("end");
 114         &function_end($name);
 115         }
 116