projects / thirdparty / glibc.git / blame
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| 5ae3e846 UD |
1 | /* SPARC v9 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 |
| 2 | and store difference in a third limb vector. | |
| 3 | ||
| 8cb079d4 | 4 | Copyright (C) 1995, 1996, 1997, 1999 Free Software Foundation, Inc. |
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5 | |
| 6 | This file is part of the GNU MP Library. | |
| 7 | ||
| 8 | The GNU MP Library is free software; you can redistribute it and/or modify | |
| 6d84f89a AJ |
9 | it under the terms of the GNU Lesser General Public License as published by |
| 10 | the Free Software Foundation; either version 2.1 of the License, or (at your | |
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11 | option) any later version. |
| 12 | ||
| 13 | The GNU MP Library is distributed in the hope that it will be useful, but | |
| 14 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
| 6d84f89a | 15 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
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16 | License for more details. |
| 17 | ||
| 6d84f89a | 18 | You should have received a copy of the GNU Lesser General Public License |
| 59ba27a6 PE |
19 | along with the GNU MP Library; see the file COPYING.LIB. If not, |
| 20 | see <http://www.gnu.org/licenses/>. */ | |
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21 | |
| 22 | #include <sysdep.h> | |
| 23 | ||
| 24 | /* INPUT PARAMETERS | |
| 25 | res_ptr %o0 | |
| 26 | s1_ptr %o1 | |
| 27 | s2_ptr %o2 | |
| 28 | size %o3 */ | |
| 29 | ||
| 30 | ENTRY(__mpn_sub_n) | |
| 31 | ||
| 8cb079d4 | 32 | sub %g0,%o3,%g5 |
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33 | sllx %o3,3,%g1 |
| 34 | add %o1,%g1,%o1 ! make s1_ptr point at end | |
| 35 | add %o2,%g1,%o2 ! make s2_ptr point at end | |
| 36 | add %o0,%g1,%o0 ! make res_ptr point at end | |
| 37 | mov 0,%o4 ! clear carry variable | |
| 8cb079d4 | 38 | sllx %g5,3,%o5 ! compute initial address index |
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39 | |
| 40 | 1: ldx [%o2+%o5],%g1 ! load s2 limb | |
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41 | add %g5,1,%g5 ! increment loop count |
| 42 | ldx [%o1+%o5],%o3 ! load s1 limb | |
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43 | addcc %g1,%o4,%g1 ! add s2 limb and carry variable |
| 44 | movcc %xcc,0,%o4 ! if carry-out, o4 was 1; clear it | |
| 8cb079d4 | 45 | subcc %o3,%g1,%g1 ! subtract s1 limb from sum |
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46 | stx %g1,[%o0+%o5] ! store result |
| 47 | add %o5,8,%o5 ! increment address index | |
| 8cb079d4 | 48 | brnz,pt %g5,1b |
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49 | movcs %xcc,1,%o4 ! if s1 subtract gave carry, record it |
| 50 | ||
| 51 | retl | |
| 52 | mov %o4,%o0 | |
| 53 | ||
| 54 | END(__mpn_sub_n) |