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