projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| ffeac417 | 1 | /* __mpn_sub_n -- Add two limb vectors of the same length > 0 and store |
| 847b055c | 2 | sum in a third limb vector. |
| 04277e02 | 3 | Copyright (C) 2000-2019 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 | |
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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) |