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ffeac417 1/* __mpn_sub_n -- Add two limb vectors of the same length > 0 and store
847b055c 2 sum in a third limb vector.
2b778ceb 3 Copyright (C) 2000-2021 Free Software Foundation, Inc.
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4 This file is part of the GNU MP Library.
5
6 The GNU MP Library is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or (at your
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9 option) any later version.
10
11 The GNU MP Library is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
6d84f89a 13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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14 License for more details.
15
6d84f89a 16 You should have received a copy of the GNU Lesser General Public License
59ba27a6 17 along with the GNU MP Library; see the file COPYING.LIB. If not,
5a82c748 18 see <https://www.gnu.org/licenses/>. */
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19
20/*
21 INPUT PARAMETERS
22 res_ptr %r2
23 s1_ptr %r3
24 s2_ptr %r4
25 size %r5
26*/
27
28#include "sysdep.h"
29#include "asm-syntax.h"
30
31ENTRY(__mpn_sub_n)
32 st %r6,24(%r15) # save register 6
844a34a2 33 cfi_offset (%r6, -72)
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34 sr %r1,%r1
35 lhi %r0,1 # cannot use ahi to add carry, use slr
36.L0: l %r6,0(%r1,%r3) # .L0 -> no carry from last sub
37 sl %r6,0(%r1,%r4)
38 st %r6,0(%r1,%r2)
39 la %r1,4(0,%r1)
40 brc 4,.L3
41.L1: brct %r5,.L0
42 slr %r2,%r2 # no last carry to return
43 j .Lexit
44.L2: l %r6,0(%r1,%r3) # .L2 -> carry from last sub
45 sl %r6,0(%r1,%r4)
46 brc 4,.L4
47 slr %r6,%r0 # no carry yet, add carry from last sub
48 st %r6,0(%r1,%r2)
49 la %r1,4(0,%r1)
50 brc 11,.L1 # new carry ?
51.L3: brct %r5,.L2
52 lr %r2,%r0 # return last carry
53 j .Lexit
54.L4: slr %r6,%r0 # already a carry, add carry from last sub
55 st %r6,0(%r1,%r2)
56 la %r1,4(0,%r1)
57 brct %r5,.L2
58 lr %r2,%r0 # return last carry
59.Lexit: l %r6,24(%r15) # restore register 6
60 br %r14
61END(__mpn_sub_n)