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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. |
688903eb | 3 | Copyright (C) 2000-2018 Free Software Foundation, Inc. |
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4 | Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). |
5 | This file is part of the GNU MP Library. | |
6 | ||
7 | The GNU MP Library is free software; you can redistribute it and/or modify | |
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8 | it under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or (at your | |
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10 | option) any later version. |
11 | ||
12 | The GNU MP Library is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
6d84f89a | 14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
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15 | License for more details. |
16 | ||
6d84f89a | 17 | You should have received a copy of the GNU Lesser General Public License |
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18 | along with the GNU MP Library; see the file COPYING.LIB. If not, |
19 | see <http://www.gnu.org/licenses/>. */ | |
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20 | |
21 | /* | |
22 | INPUT PARAMETERS | |
23 | res_ptr %r2 | |
24 | s1_ptr %r3 | |
25 | s2_ptr %r4 | |
26 | size %r5 | |
27 | */ | |
28 | ||
29 | #include "sysdep.h" | |
30 | #include "asm-syntax.h" | |
31 | ||
32 | ENTRY(__mpn_sub_n) | |
33 | st %r6,24(%r15) # save register 6 | |
844a34a2 | 34 | cfi_offset (%r6, -72) |
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35 | sr %r1,%r1 |
36 | lhi %r0,1 # cannot use ahi to add carry, use slr | |
37 | .L0: l %r6,0(%r1,%r3) # .L0 -> no carry from last sub | |
38 | sl %r6,0(%r1,%r4) | |
39 | st %r6,0(%r1,%r2) | |
40 | la %r1,4(0,%r1) | |
41 | brc 4,.L3 | |
42 | .L1: brct %r5,.L0 | |
43 | slr %r2,%r2 # no last carry to return | |
44 | j .Lexit | |
45 | .L2: l %r6,0(%r1,%r3) # .L2 -> carry from last sub | |
46 | sl %r6,0(%r1,%r4) | |
47 | brc 4,.L4 | |
48 | slr %r6,%r0 # no carry yet, add carry from last sub | |
49 | st %r6,0(%r1,%r2) | |
50 | la %r1,4(0,%r1) | |
51 | brc 11,.L1 # new carry ? | |
52 | .L3: brct %r5,.L2 | |
53 | lr %r2,%r0 # return last carry | |
54 | j .Lexit | |
55 | .L4: slr %r6,%r0 # already a carry, add carry from last sub | |
56 | st %r6,0(%r1,%r2) | |
57 | la %r1,4(0,%r1) | |
58 | brct %r5,.L2 | |
59 | lr %r2,%r0 # return last carry | |
60 | .Lexit: l %r6,24(%r15) # restore register 6 | |
61 | br %r14 | |
62 | END(__mpn_sub_n) |