projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| ffeac417 UD |
1 | /* __mpn_sub_n -- Add two limb vectors of the same length > 0 and store |
| 2 | sum in a third limb vector. 64 bit S/390 version. | |
| 2b778ceb | 3 | Copyright (C) 2001-2021 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 C Library is free software; you can redistribute it and/or | |
| 6d84f89a AJ |
8 | modify it under the terms of the GNU Lesser General Public License as |
| 9 | published by the Free Software Foundation; either version 2.1 of the | |
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10 | License, or (at your option) any later version. |
| 11 | ||
| 12 | The GNU C Library is distributed in the hope that it will be useful, | |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 6d84f89a | 15 | Lesser General Public License for more details. |
| ffeac417 | 16 | |
| 6d84f89a | 17 | You should have received a copy of the GNU Lesser General Public |
| ffeac417 | 18 | License along with the GNU C Library; see the file COPYING.LIB. If not, |
| 5a82c748 | 19 | see <https://www.gnu.org/licenses/>. */ |
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20 | |
| 21 | /* INPUT PARAMETERS | |
| 22 | %r2 = res_ptr | |
| 23 | %r3 = s1_ptr | |
| 24 | %r4 = s2_ptr | |
| 25 | %r5 = size. */ | |
| 9c84384c | 26 | |
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27 | #include "sysdep.h" |
| 28 | #include "asm-syntax.h" | |
| 29 | ||
| 30 | ENTRY(__mpn_sub_n) | |
| 31 | stg %r6,48(%r15) # save register 6 | |
| 844a34a2 | 32 | cfi_offset (%r6,-112) |
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33 | sgr %r1,%r1 |
| 34 | lghi %r0,1 # cannot use ahi to add carry, use slr | |
| 35 | .L0: lg %r6,0(%r1,%r3) # .L0 -> no carry from last sub | |
| 36 | slg %r6,0(%r1,%r4) | |
| 37 | stg %r6,0(%r1,%r2) | |
| 38 | la %r1,8(%r1) | |
| 39 | brc 4,.L3 | |
| 40 | .L1: brct %r5,.L0 | |
| 41 | slgr %r2,%r2 # no last carry to return | |
| 42 | j .Lexit | |
| 43 | .L2: lg %r6,0(%r1,%r3) # .L2 -> carry from last sub | |
| 44 | slg %r6,0(%r1,%r4) | |
| 45 | brc 4,.L4 | |
| 46 | slgr %r6,%r0 # no carry yet, add carry from last sub | |
| 47 | stg %r6,0(%r1,%r2) | |
| 48 | la %r1,8(%r1) | |
| 49 | brc 11,.L1 # new carry ? | |
| 50 | .L3: brct %r5,.L2 | |
| 51 | lgr %r2,%r0 # return last carry | |
| 52 | j .Lexit | |
| 53 | .L4: slgr %r6,%r0 # already a carry, add carry from last sub | |
| 54 | stg %r6,0(%r1,%r2) | |
| 55 | la %r1,8(%r1) | |
| 56 | brct %r5,.L2 | |
| 57 | lgr %r2,%r0 # return last carry | |
| 58 | .Lexit: lg %r6,48(%r15) # restore register 6 | |
| 59 | br %r14 | |
| 60 | END(__mpn_sub_n) |