projects / thirdparty / glibc.git / blame
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|---|---|---|
| 847b055c AJ |
1 | /* Add two limb vectors of the same length > 0 and store sum in a third |
| 2 | limb vector. | |
| 04277e02 | 3 | Copyright (C) 2001-2019 Free Software Foundation, Inc. |
| 847b055c AJ |
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 | |
| 6d84f89a AJ |
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 | |
| 847b055c AJ |
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 |
| 59ba27a6 | 18 | along with the GNU MP Library; see the file COPYING.LIB. If not, |
| 5a82c748 | 19 | see <https://www.gnu.org/licenses/>. */ |
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20 | |
| 21 | /* | |
| ffeac417 UD |
22 | INPUT PARAMETERS |
| 23 | res_ptr %r2 | |
| 24 | s1_ptr %r3 | |
| 25 | s2_ptr %r4 | |
| 26 | size %r5 | |
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27 | */ |
| 28 | ||
| 29 | #include "sysdep.h" | |
| 30 | #include "asm-syntax.h" | |
| 31 | ||
| 32 | .text | |
| 33 | ENTRY(__mpn_add_n) | |
| ffeac417 | 34 | stg %r6,48(%r15) # save register 6 |
| 844a34a2 | 35 | cfi_offset (%r6,-112) |
| ffeac417 UD |
36 | slgr %r1,%r1 |
| 37 | lghi %r0,1 # cannot use ahi to add carry, use alr | |
| 38 | .L0: lg %r6,0(%r1,%r3) # .L0 -> no carry from last add | |
| 39 | alg %r6,0(%r1,%r4) | |
| 40 | stg %r6,0(%r1,%r2) | |
| 41 | la %r1,8(%r1) | |
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42 | brc 3,.L3 |
| 43 | .L1: brct %r5,.L0 | |
| ffeac417 | 44 | slgr %r2,%r2 # no last carry to return |
| 847b055c | 45 | j .Lexit |
| ffeac417 UD |
46 | .L2: lg %r6,0(%r1,%r3) # .L2 -> carry from last add |
| 47 | alg %r6,0(%r1,%r4) | |
| 847b055c | 48 | brc 3,.L4 |
| ffeac417 UD |
49 | algr %r6,%r0 # no carry yet, add carry from last add |
| 50 | stg %r6,0(%r1,%r2) | |
| 51 | la %r1,8(%r1) | |
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52 | brc 12,.L1 # new carry ? |
| 53 | .L3: brct %r5,.L2 | |
| ffeac417 | 54 | lgr %r2,%r0 # return last carry |
| 847b055c | 55 | j .Lexit |
| ffeac417 UD |
56 | .L4: algr %r6,%r0 # already a carry, add carry from last add |
| 57 | stg %r6,0(%r1,%r2) | |
| 58 | la %r1,8(%r1) | |
| 847b055c | 59 | brct %r5,.L2 |
| ffeac417 UD |
60 | lgr %r2,%r0 # return last carry |
| 61 | .Lexit: lg %r6,48(%r15) # restore register 6 | |
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62 | br %r14 |
| 63 | END(__mpn_add_n) |