| 1 | /* Multiply a limb vector by a limb, for PowerPC. |
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| 2 | Copyright (C) 1993-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sysdep.h> |
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| 20 | |
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| 21 | /* mp_limb_t mpn_mul_1 (mp_ptr res_ptr, mp_srcptr s1_ptr, |
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| 22 | mp_size_t s1_size, mp_limb_t s2_limb) |
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| 23 | Calculate s1*s2 and put result in res_ptr; return carry. */ |
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| 24 | |
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| 25 | ENTRY (__mpn_mul_1) |
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| 26 | mtctr r5 |
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| 27 | |
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| 28 | lwz r0,0(r4) |
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| 29 | mullw r7,r0,r6 |
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| 30 | mulhwu r10,r0,r6 |
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| 31 | addi r3,r3,-4 # adjust res_ptr |
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| 32 | addic r5,r5,0 # clear cy with dummy insn |
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| 33 | bdz L(1) |
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| 34 | |
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| 35 | L(0): lwzu r0,4(r4) |
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| 36 | stwu r7,4(r3) |
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| 37 | mullw r8,r0,r6 |
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| 38 | adde r7,r8,r10 |
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| 39 | mulhwu r10,r0,r6 |
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| 40 | bdnz L(0) |
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| 41 | |
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| 42 | L(1): stw r7,4(r3) |
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| 43 | addze r3,r10 |
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| 44 | blr |
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| 45 | END (__mpn_mul_1) |
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| 46 | |
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