git://sourceware.org / glibc.git / blame
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1 | /* MIPS2 __mpn_rshift -- |
| 2 | ||
| dff8da6b | 3 | Copyright (C) 1995-2024 Free Software Foundation, Inc. |
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4 | |
| 5 | This file is part of the GNU MP Library. | |
| 6 | ||
| 7 | The GNU MP Library is free software; you can redistribute it and/or modify | |
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8 | it under the terms of the GNU Lesser General Public License as published by |
| 9 | the Free Software Foundation; either version 2.1 of the License, or (at your | |
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10 | option) any later version. |
| 11 | ||
| 12 | The GNU MP Library is distributed in the hope that it will be useful, but | |
| 13 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
| f01ec467 | 14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
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15 | License for more details. |
| 16 | ||
| f01ec467 | 17 | You should have received a copy of the GNU Lesser General Public License |
| ab84e3ff | 18 | along with the GNU MP Library. If not, see |
| 5a82c748 | 19 | <https://www.gnu.org/licenses/>. */ |
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20 | |
| 21 | #include <sysdep.h> | |
| 22 | ||
| 23 | /* INPUT PARAMETERS | |
| 24 | res_ptr $4 | |
| 25 | src_ptr $5 | |
| 26 | size $6 | |
| 27 | cnt $7 | |
| 28 | */ | |
| b5e0b658 | 29 | #ifdef __PIC__ |
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30 | .option pic2 |
| 31 | #endif | |
| 32 | ENTRY (__mpn_rshift) | |
| 33 | .set noreorder | |
| b5e0b658 | 34 | #ifdef __PIC__ |
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35 | .cpload t9 |
| 36 | #endif | |
| 37 | .set nomacro | |
| 38 | ||
| 39 | lw $10,0($5) /* load first limb */ | |
| 40 | subu $13,$0,$7 | |
| 41 | addiu $6,$6,-1 | |
| 42 | and $9,$6,4-1 /* number of limbs in first loop */ | |
| 3e9a9758 | 43 | beq $9,$0,L(L0) /* if multiple of 4 limbs, skip first loop*/ |
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44 | sll $2,$10,$13 /* compute function result */ |
| 45 | ||
| 46 | subu $6,$6,$9 | |
| 47 | ||
| 3e9a9758 | 48 | L(Loop0): lw $3,4($5) |
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49 | addiu $4,$4,4 |
| 50 | addiu $5,$5,4 | |
| 51 | addiu $9,$9,-1 | |
| 52 | srl $11,$10,$7 | |
| 53 | sll $12,$3,$13 | |
| 54 | move $10,$3 | |
| 55 | or $8,$11,$12 | |
| 3e9a9758 | 56 | bne $9,$0,L(Loop0) |
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57 | sw $8,-4($4) |
| 58 | ||
| 3e9a9758 | 59 | L(L0): beq $6,$0,L(Lend) |
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60 | nop |
| 61 | ||
| 3e9a9758 | 62 | L(Loop): lw $3,4($5) |
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63 | addiu $4,$4,16 |
| 64 | addiu $6,$6,-4 | |
| 65 | srl $11,$10,$7 | |
| 66 | sll $12,$3,$13 | |
| 67 | ||
| 68 | lw $10,8($5) | |
| 69 | srl $14,$3,$7 | |
| 70 | or $8,$11,$12 | |
| 71 | sw $8,-16($4) | |
| 72 | sll $9,$10,$13 | |
| 73 | ||
| 74 | lw $3,12($5) | |
| 75 | srl $11,$10,$7 | |
| 76 | or $8,$14,$9 | |
| 77 | sw $8,-12($4) | |
| 78 | sll $12,$3,$13 | |
| 79 | ||
| 80 | lw $10,16($5) | |
| 81 | srl $14,$3,$7 | |
| 82 | or $8,$11,$12 | |
| 83 | sw $8,-8($4) | |
| 84 | sll $9,$10,$13 | |
| 85 | ||
| 86 | addiu $5,$5,16 | |
| 87 | or $8,$14,$9 | |
| 3e9a9758 | 88 | bgtz $6,L(Loop) |
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89 | sw $8,-4($4) |
| 90 | ||
| 3e9a9758 | 91 | L(Lend): srl $8,$10,$7 |
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92 | j $31 |
| 93 | sw $8,0($4) | |
| 2cf8794a | 94 | END (__mpn_rshift) |