| 1 | /* Shift a limb right, low level routine. |
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| 2 | Copyright (C) 1995-2024 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 | /* INPUT PARAMETERS |
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| 22 | res_ptr r3 |
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| 23 | s1_ptr r4 |
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| 24 | size r5 |
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| 25 | cnt r6 */ |
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| 26 | |
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| 27 | ENTRY (__mpn_rshift) |
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| 28 | mtctr r5 # copy size into CTR |
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| 29 | addi r7,r3,-4 # move adjusted res_ptr to free return reg |
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| 30 | subfic r8,r6,32 |
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| 31 | lwz r11,0(r4) # load first s1 limb |
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| 32 | slw r3,r11,r8 # compute function return value |
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| 33 | bdz L(1) |
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| 34 | |
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| 35 | L(0): lwzu r10,4(r4) |
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| 36 | srw r9,r11,r6 |
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| 37 | slw r12,r10,r8 |
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| 38 | or r9,r9,r12 |
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| 39 | stwu r9,4(r7) |
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| 40 | bdz L(2) |
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| 41 | lwzu r11,4(r4) |
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| 42 | srw r9,r10,r6 |
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| 43 | slw r12,r11,r8 |
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| 44 | or r9,r9,r12 |
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| 45 | stwu r9,4(r7) |
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| 46 | bdnz L(0) |
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| 47 | |
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| 48 | L(1): srw r0,r11,r6 |
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| 49 | stw r0,4(r7) |
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| 50 | blr |
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| 51 | |
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| 52 | L(2): srw r0,r10,r6 |
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| 53 | stw r0,4(r7) |
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| 54 | blr |
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| 55 | END (__mpn_rshift) |
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| 56 | |
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