projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| fe62ba37 | 1 | /* mpn_submul_1 -- multiply and subtract bignums. |
| d4697bc9 | 2 | Copyright (C) 2013-2014 Free Software Foundation, Inc. |
| fe62ba37 RH |
3 | This file is part of the GNU C Library. |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Lesser General Public | |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| 16 | License along with the GNU C Library. If not, see | |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 18 | ||
| 19 | #include <sysdep.h> | |
| 20 | ||
| 21 | .syntax unified | |
| 22 | .text | |
| 23 | ||
| 24 | @ cycles/limb | |
| 25 | @ StrongArm ? | |
| 26 | @ Cortex-A8 ? | |
| 27 | @ Cortex-A9 ? | |
| 28 | @ Cortex-A15 4 | |
| 29 | ||
| 30 | /* mp_limb_t mpn_submul_1(res_ptr, src1_ptr, size, s2_limb) */ | |
| 31 | ||
| 32 | ENTRY (__mpn_submul_1) | |
| 33 | push { r4, r5, r6, r7 } | |
| 34 | cfi_adjust_cfa_offset (16) | |
| 35 | cfi_rel_offset (r4, 0) | |
| 36 | cfi_rel_offset (r5, 4) | |
| 37 | cfi_rel_offset (r6, 8) | |
| 38 | cfi_rel_offset (r7, 12) | |
| 39 | ||
| a7ac7522 RM |
40 | sfi_breg r1, \ |
| 41 | ldr r6, [\B], #4 | |
| 42 | sfi_breg r0, \ | |
| 43 | ldr r7, [\B] | |
| fe62ba37 RH |
44 | mov r4, #0 /* init carry in */ |
| 45 | b 1f | |
| 46 | 0: | |
| a7ac7522 RM |
47 | sfi_breg r1, \ |
| 48 | ldr r6, [\B], #4 /* load next ul */ | |
| fe62ba37 RH |
49 | adds r5, r5, r4 /* (lpl, c) = lpl + cl */ |
| 50 | adc r4, ip, #0 /* cl = hpl + c */ | |
| 51 | subs r5, r7, r5 /* (lpl, !c) = rl - lpl */ | |
| a7ac7522 RM |
52 | sfi_breg r0, \ |
| 53 | ldr r7, [\B, #4] /* load next rl */ | |
| fe62ba37 RH |
54 | it cc |
| 55 | addcc r4, r4, #1 /* cl += !c */ | |
| a7ac7522 RM |
56 | sfi_breg r0, \ |
| 57 | str r5, [\B], #4 | |
| fe62ba37 RH |
58 | 1: |
| 59 | umull r5, ip, r6, r3 /* (hpl, lpl) = ul * vl */ | |
| 60 | subs r2, r2, #1 | |
| 61 | bne 0b | |
| 62 | ||
| 63 | adds r5, r5, r4 /* (lpl, c) = lpl + cl */ | |
| 64 | adc r4, ip, #0 /* cl = hpl + c */ | |
| 65 | subs r5, r7, r5 /* (lpl, !c) = rl - lpl */ | |
| a7ac7522 RM |
66 | sfi_breg r0, \ |
| 67 | str r5, [\B], #4 | |
| fe62ba37 RH |
68 | it cc |
| 69 | addcc r4, r4, #1 /* cl += !c */ | |
| 70 | mov r0, r4 /* return carry */ | |
| 71 | ||
| 72 | pop { r4, r5, r6, r7 } | |
| 73 | DO_RET (lr) | |
| 74 | END (__mpn_submul_1) |