2 # I have this in perl so I can use more usefull register names and then convert
3 # them into alpha registers.
6 push(@INC,"perlasm","../../perlasm");
9 &asm_init($ARGV[0],$0);
11 print &bn_sub_words("bn_sub_words");
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"; $t3="r15";
31 &function_begin($name,"");
34 &sub($count,4,$count);
36 &blt($count,&label("finish"));
38 &ld($a0,&QWPw(0,$ap));
39 &ld($b0,&QWPw(0,$bp));
41 ##########################################################
44 &ld($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
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,$cc); # add the borrows
62 &cmpult($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
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,$cc); # add the borrows
76 &st($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
83 &blt($count,&label("finish"));
84 &ld($a0,&QWPw(0,$ap));
85 &ld($b0,&QWPw(0,$bp));
87 ##################################################
88 # Do the last 0..3 words
90 &set_label("last_loop");
92 &ld($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
104 &sub($count,1,$count);
105 &bgt($count,&label("last_loop"));
106 &function_end_A($name);
108 ######################################################
109 &set_label("finish");
110 &add($count,4,$count);
111 &bgt($count,&label("last_loop"));
114 &function_end($name);