| 1 | /* MIPS2 __mpn_lshift -- |
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| 2 | |
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| 3 | Copyright (C) 1995-2022 Free Software Foundation, Inc. |
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| 4 | |
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| 5 | This file is part of the GNU MP Library. |
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| 6 | |
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| 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 |
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| 9 | the Free Software Foundation; either version 2.1 of the License, or (at your |
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| 10 | option) any later version. |
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| 11 | |
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| 12 | The GNU MP Library is distributed in the hope that it will be useful, but |
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| 13 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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| 14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
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| 15 | License for more details. |
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| 16 | |
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| 17 | You should have received a copy of the GNU Lesser General Public License |
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| 18 | along with the GNU MP Library. If not, see |
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| 19 | <https://www.gnu.org/licenses/>. */ |
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| 20 | |
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| 21 | #include <sysdep.h> |
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| 22 | |
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| 23 | /* INPUT PARAMETERS |
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| 24 | res_ptr $4 |
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| 25 | src_ptr $5 |
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| 26 | size $6 |
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| 27 | cnt $7 |
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| 28 | */ |
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| 29 | #ifdef __PIC__ |
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| 30 | .option pic2 |
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| 31 | #endif |
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| 32 | ENTRY (__mpn_lshift) |
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| 33 | .set noreorder |
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| 34 | #ifdef __PIC__ |
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| 35 | .cpload t9 |
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| 36 | #endif |
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| 37 | .set nomacro |
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| 38 | |
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| 39 | sll $2,$6,2 |
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| 40 | addu $5,$5,$2 /* make r5 point at end of src */ |
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| 41 | lw $10,-4($5) /* load first limb */ |
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| 42 | subu $13,$0,$7 |
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| 43 | addu $4,$4,$2 /* make r4 point at end of res */ |
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| 44 | addiu $6,$6,-1 |
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| 45 | and $9,$6,4-1 /* number of limbs in first loop */ |
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| 46 | beq $9,$0,L(L0) /* if multiple of 4 limbs, skip first loop */ |
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| 47 | srl $2,$10,$13 /* compute function result */ |
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| 48 | |
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| 49 | subu $6,$6,$9 |
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| 50 | |
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| 51 | L(Loop0): lw $3,-8($5) |
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| 52 | addiu $4,$4,-4 |
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| 53 | addiu $5,$5,-4 |
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| 54 | addiu $9,$9,-1 |
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| 55 | sll $11,$10,$7 |
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| 56 | srl $12,$3,$13 |
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| 57 | move $10,$3 |
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| 58 | or $8,$11,$12 |
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| 59 | bne $9,$0,L(Loop0) |
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| 60 | sw $8,0($4) |
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| 61 | |
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| 62 | L(L0): beq $6,$0,L(Lend) |
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| 63 | nop |
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| 64 | |
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| 65 | L(Loop): lw $3,-8($5) |
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| 66 | addiu $4,$4,-16 |
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| 67 | addiu $6,$6,-4 |
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| 68 | sll $11,$10,$7 |
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| 69 | srl $12,$3,$13 |
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| 70 | |
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| 71 | lw $10,-12($5) |
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| 72 | sll $14,$3,$7 |
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| 73 | or $8,$11,$12 |
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| 74 | sw $8,12($4) |
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| 75 | srl $9,$10,$13 |
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| 76 | |
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| 77 | lw $3,-16($5) |
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| 78 | sll $11,$10,$7 |
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| 79 | or $8,$14,$9 |
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| 80 | sw $8,8($4) |
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| 81 | srl $12,$3,$13 |
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| 82 | |
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| 83 | lw $10,-20($5) |
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| 84 | sll $14,$3,$7 |
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| 85 | or $8,$11,$12 |
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| 86 | sw $8,4($4) |
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| 87 | srl $9,$10,$13 |
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| 88 | |
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| 89 | addiu $5,$5,-16 |
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| 90 | or $8,$14,$9 |
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| 91 | bgtz $6,L(Loop) |
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| 92 | sw $8,0($4) |
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| 93 | |
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| 94 | L(Lend): sll $8,$10,$7 |
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| 95 | j $31 |
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| 96 | sw $8,-4($4) |
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| 97 | END (__mpn_lshift) |
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| 98 | |
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