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  • Committer: Bazaar Package Importer
  • Author(s): Christoph Martin
  • Date: 2004-05-24 17:02:29 UTC
  • Revision ID: james.westby@ubuntu.com-20040524170229-ixlo08bbbly0xied
Tags: upstream-0.9.7d
Import upstream version 0.9.7d

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crypto/bn/asm/co-alpha.pl
 
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#!/usr/local/bin/perl
 
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# I have this in perl so I can use more usefull register names and then convert
 
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# them into alpha registers.
 
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#
 
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push(@INC,"perlasm","../../perlasm");
 
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require "alpha.pl";
 
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&asm_init($ARGV[0],$0);
 
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print &bn_sub_words("bn_sub_words");
 
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&asm_finish();
 
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sub bn_sub_words
 
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        {
 
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        local($name)=@_;
 
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        local($cc,$a,$b,$r);
 
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        $cc="r0";
 
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        $a0="r1"; $b0="r5"; $r0="r9";  $tmp="r13";
 
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        $a1="r2"; $b1="r6"; $r1="r10"; $t1="r14";
 
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        $a2="r3"; $b2="r7"; $r2="r11";
 
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        $a3="r4"; $b3="r8"; $r3="r12"; $t3="r15";
 
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        $rp=&wparam(0);
 
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        $ap=&wparam(1);
 
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        $bp=&wparam(2);
 
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        $count=&wparam(3);
 
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        &function_begin($name,"");
 
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        &comment("");
 
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        &sub($count,4,$count);
 
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        &mov("zero",$cc);
 
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        &blt($count,&label("finish"));
 
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        &ld($a0,&QWPw(0,$ap));
 
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        &ld($b0,&QWPw(0,$bp));
 
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##########################################################
 
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        &set_label("loop");
 
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        &ld($a1,&QWPw(1,$ap));
 
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         &cmpult($a0,$b0,$tmp); # will we borrow?
 
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        &ld($b1,&QWPw(1,$bp));
 
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         &sub($a0,$b0,$a0);             # do the subtract
 
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        &ld($a2,&QWPw(2,$ap));
 
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         &cmpult($a0,$cc,$b0);  # will we borrow?
 
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        &ld($b2,&QWPw(2,$bp));
 
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         &sub($a0,$cc,$a0);     # will we borrow?
 
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        &ld($a3,&QWPw(3,$ap));
 
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         &add($b0,$tmp,$cc);    # add the borrows
 
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        &cmpult($a1,$b1,$t1);   # will we borrow?
 
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         &sub($a1,$b1,$a1);     # do the subtract
 
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        &ld($b3,&QWPw(3,$bp));
 
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         &cmpult($a1,$cc,$b1);  # will we borrow?
 
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        &sub($a1,$cc,$a1);      # will we borrow?
 
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         &add($b1,$t1,$cc);     # add the borrows
 
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        &cmpult($a2,$b2,$tmp);  # will we borrow?
 
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         &sub($a2,$b2,$a2);             # do the subtract
 
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        &st($a0,&QWPw(0,$rp));  # save
 
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         &cmpult($a2,$cc,$b2);  # will we borrow?
 
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        &sub($a2,$cc,$a2);      # will we borrow?
 
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         &add($b2,$tmp,$cc);    # add the borrows
 
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        &cmpult($a3,$b3,$t3);   # will we borrow?
 
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         &sub($a3,$b3,$a3);             # do the subtract
 
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        &st($a1,&QWPw(1,$rp));  # save
 
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         &cmpult($a3,$cc,$b3);  # will we borrow?
 
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        &sub($a3,$cc,$a3);      # will we borrow?
 
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         &add($b3,$t3,$cc);     # add the borrows
 
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        &st($a2,&QWPw(2,$rp));  # save
 
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         &sub($count,4,$count); # count-=4
 
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        &st($a3,&QWPw(3,$rp));  # save
 
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         &add($ap,4*$QWS,$ap);  # count+=4
 
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        &add($bp,4*$QWS,$bp);   # count+=4
 
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         &add($rp,4*$QWS,$rp);  # count+=4
 
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        &blt($count,&label("finish"));
 
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        &ld($a0,&QWPw(0,$ap));
 
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         &ld($b0,&QWPw(0,$bp));
 
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        &br(&label("loop"));
 
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##################################################
 
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        # Do the last 0..3 words
 
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        &set_label("last_loop");
 
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        &ld($a0,&QWPw(0,$ap));  # get a
 
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         &ld($b0,&QWPw(0,$bp)); # get b
 
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        &cmpult($a0,$b0,$tmp);  # will we borrow?
 
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        &sub($a0,$b0,$a0);      # do the subtract
 
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        &cmpult($a0,$cc,$b0);   # will we borrow?
 
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        &sub($a0,$cc,$a0);      # will we borrow?
 
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        &st($a0,&QWPw(0,$rp));  # save
 
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        &add($b0,$tmp,$cc);     # add the borrows
 
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        &add($ap,$QWS,$ap);
 
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        &add($bp,$QWS,$bp);
 
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        &add($rp,$QWS,$rp);
 
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        &sub($count,1,$count);
 
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        &bgt($count,&label("last_loop"));
 
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        &function_end_A($name);
 
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######################################################
 
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        &set_label("finish");
 
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        &add($count,4,$count);
 
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        &bgt($count,&label("last_loop"));
 
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        &set_label("end");
 
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        &function_end($name);
 
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        }
 
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