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