1;! HP-PA __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
2;! store difference in a third limb vector.
3
4;! Copyright (C) 1992-2022 Free Software Foundation, Inc.
5
6;! This file is part of the GNU MP Library.
7
8;! The GNU MP Library is free software; you can redistribute it and/or modify
9;! it under the terms of the GNU Lesser General Public License as published by
10;! the Free Software Foundation; either version 2.1 of the License, or (at your
11;! option) any later version.
12
13;! The GNU MP Library is distributed in the hope that it will be useful, but
14;! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15;! or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16;! License for more details.
17
18;! You should have received a copy of the GNU Lesser General Public License
19;! along with the GNU MP Library. If not, see
20;! <https://www.gnu.org/licenses/>.
21
22
23;! INPUT PARAMETERS
24;! res_ptr gr26
25;! s1_ptr gr25
26;! s2_ptr gr24
27;! size gr23
28
29;! One might want to unroll this as for other processors, but it turns
30;! out that the data cache contention after a store makes such
31;! unrolling useless. We can't come under 5 cycles/limb anyway.
32
33 .text
34 .export __mpn_sub_n
35__mpn_sub_n:
36 .proc
37 .callinfo frame=0,no_calls
38 .entry
39
40 ldws,ma 4(%r25),%r21
41 ldws,ma 4(%r24),%r20
42
43 addib,= -1,%r23,L$end ;! check for (SIZE == 1)
44 sub %r21,%r20,%r28 ;! subtract first limbs ignoring cy
45
46L$loop: ldws,ma 4(%r25),%r21
47 ldws,ma 4(%r24),%r20
48 stws,ma %r28,4(%r26)
49 addib,<> -1,%r23,L$loop
50 subb %r21,%r20,%r28
51
52L$end: stws %r28,0(%r26)
53 addc %r0,%r0,%r28
54 bv 0(%r2)
55 subi 1,%r28,%r28
56
57 .exit
58 .procend
59

source code of glibc/sysdeps/hppa/sub_n.S