1998-12-21 11:00:56 +00:00
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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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1999-02-12 19:05:10 +00:00
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&asm_init($ARGV[0],$0);
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1998-12-21 11:00:56 +00:00
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print &bn_sub_words("bn_sub_words");
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&asm_finish();
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sub bn_sub_words
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{
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local($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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