projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 847b055c AJ |
1 | /* Add two limb vectors of the same length > 0 and store sum in a third |
| 2 | limb vector. | |
| ffeac417 | 3 | Copyright (C) 2001 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 |
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18 | along with the GNU MP Library; see the file COPYING.LIB. If not, write to |
| 19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
| 20 | MA 02111-1307, USA. */ | |
| 21 | ||
| 22 | /* | |
| ffeac417 UD |
23 | INPUT PARAMETERS |
| 24 | res_ptr %r2 | |
| 25 | s1_ptr %r3 | |
| 26 | s2_ptr %r4 | |
| 27 | size %r5 | |
| 847b055c AJ |
28 | */ |
| 29 | ||
| 30 | #include "sysdep.h" | |
| 31 | #include "asm-syntax.h" | |
| 32 | ||
| 33 | .text | |
| 34 | ENTRY(__mpn_add_n) | |
| ffeac417 | 35 | stg %r6,48(%r15) # save register 6 |
| 844a34a2 | 36 | cfi_offset (%r6,-112) |
| ffeac417 UD |
37 | slgr %r1,%r1 |
| 38 | lghi %r0,1 # cannot use ahi to add carry, use alr | |
| 39 | .L0: lg %r6,0(%r1,%r3) # .L0 -> no carry from last add | |
| 40 | alg %r6,0(%r1,%r4) | |
| 41 | stg %r6,0(%r1,%r2) | |
| 42 | la %r1,8(%r1) | |
| 847b055c AJ |
43 | brc 3,.L3 |
| 44 | .L1: brct %r5,.L0 | |
| ffeac417 | 45 | slgr %r2,%r2 # no last carry to return |
| 847b055c | 46 | j .Lexit |
| ffeac417 UD |
47 | .L2: lg %r6,0(%r1,%r3) # .L2 -> carry from last add |
| 48 | alg %r6,0(%r1,%r4) | |
| 847b055c | 49 | brc 3,.L4 |
| ffeac417 UD |
50 | algr %r6,%r0 # no carry yet, add carry from last add |
| 51 | stg %r6,0(%r1,%r2) | |
| 52 | la %r1,8(%r1) | |
| 847b055c AJ |
53 | brc 12,.L1 # new carry ? |
| 54 | .L3: brct %r5,.L2 | |
| ffeac417 | 55 | lgr %r2,%r0 # return last carry |
| 847b055c | 56 | j .Lexit |
| ffeac417 UD |
57 | .L4: algr %r6,%r0 # already a carry, add carry from last add |
| 58 | stg %r6,0(%r1,%r2) | |
| 59 | la %r1,8(%r1) | |
| 847b055c | 60 | brct %r5,.L2 |
| ffeac417 UD |
61 | lgr %r2,%r0 # return last carry |
| 62 | .Lexit: lg %r6,48(%r15) # restore register 6 | |
| 847b055c AJ |
63 | br %r14 |
| 64 | END(__mpn_add_n) |