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fe62ba37 | 1 | /* mpn_submul_1 -- multiply and subtract bignums. |
688903eb | 2 | Copyright (C) 2013-2018 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 | ||
81cb7a0b ZW |
40 | ldr r6, [r1], #4 |
41 | ldr r7, [r0] | |
fe62ba37 RH |
42 | mov r4, #0 /* init carry in */ |
43 | b 1f | |
44 | 0: | |
81cb7a0b | 45 | ldr r6, [r1], #4 /* load next ul */ |
fe62ba37 RH |
46 | adds r5, r5, r4 /* (lpl, c) = lpl + cl */ |
47 | adc r4, ip, #0 /* cl = hpl + c */ | |
48 | subs r5, r7, r5 /* (lpl, !c) = rl - lpl */ | |
81cb7a0b | 49 | ldr r7, [r0, #4] /* load next rl */ |
fe62ba37 RH |
50 | it cc |
51 | addcc r4, r4, #1 /* cl += !c */ | |
81cb7a0b | 52 | str r5, [r0], #4 |
fe62ba37 RH |
53 | 1: |
54 | umull r5, ip, r6, r3 /* (hpl, lpl) = ul * vl */ | |
55 | subs r2, r2, #1 | |
56 | bne 0b | |
57 | ||
58 | adds r5, r5, r4 /* (lpl, c) = lpl + cl */ | |
59 | adc r4, ip, #0 /* cl = hpl + c */ | |
60 | subs r5, r7, r5 /* (lpl, !c) = rl - lpl */ | |
81cb7a0b | 61 | str r5, [r0], #4 |
fe62ba37 RH |
62 | it cc |
63 | addcc r4, r4, #1 /* cl += !c */ | |
64 | mov r0, r4 /* return carry */ | |
65 | ||
66 | pop { r4, r5, r6, r7 } | |
67 | DO_RET (lr) | |
68 | END (__mpn_submul_1) |