| dnl MIPS32 mpn_rshift -- Right shift. |
| |
| dnl Copyright 1995, 2000, 2002 Free Software Foundation, Inc. |
| |
| dnl This file is part of the GNU MP Library. |
| dnl |
| dnl The GNU MP Library is free software; you can redistribute it and/or modify |
| dnl it under the terms of either: |
| dnl |
| dnl * the GNU Lesser General Public License as published by the Free |
| dnl Software Foundation; either version 3 of the License, or (at your |
| dnl option) any later version. |
| dnl |
| dnl or |
| dnl |
| dnl * the GNU General Public License as published by the Free Software |
| dnl Foundation; either version 2 of the License, or (at your option) any |
| dnl later version. |
| dnl |
| dnl or both in parallel, as here. |
| dnl |
| dnl The GNU MP Library is distributed in the hope that it will be useful, but |
| dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| dnl for more details. |
| dnl |
| dnl You should have received copies of the GNU General Public License and the |
| dnl GNU Lesser General Public License along with the GNU MP Library. If not, |
| dnl see https://www.gnu.org/licenses/. |
| |
| include(`../config.m4') |
| |
| C INPUT PARAMETERS |
| C res_ptr $4 |
| C src_ptr $5 |
| C size $6 |
| C cnt $7 |
| |
| ASM_START() |
| PROLOGUE(mpn_rshift) |
| lw $10,0($5) C load first limb |
| subu $13,$0,$7 |
| addiu $6,$6,-1 |
| and $9,$6,4-1 C number of limbs in first loop |
| beq $9,$0,.L0 C if multiple of 4 limbs, skip first loop |
| sll $2,$10,$13 C compute function result |
| |
| subu $6,$6,$9 |
| |
| .Loop0: lw $3,4($5) |
| addiu $4,$4,4 |
| addiu $5,$5,4 |
| addiu $9,$9,-1 |
| srl $11,$10,$7 |
| sll $12,$3,$13 |
| move $10,$3 |
| or $8,$11,$12 |
| bne $9,$0,.Loop0 |
| sw $8,-4($4) |
| |
| .L0: beq $6,$0,.Lend |
| nop |
| |
| .Loop: lw $3,4($5) |
| addiu $4,$4,16 |
| addiu $6,$6,-4 |
| srl $11,$10,$7 |
| sll $12,$3,$13 |
| |
| lw $10,8($5) |
| srl $14,$3,$7 |
| or $8,$11,$12 |
| sw $8,-16($4) |
| sll $9,$10,$13 |
| |
| lw $3,12($5) |
| srl $11,$10,$7 |
| or $8,$14,$9 |
| sw $8,-12($4) |
| sll $12,$3,$13 |
| |
| lw $10,16($5) |
| srl $14,$3,$7 |
| or $8,$11,$12 |
| sw $8,-8($4) |
| sll $9,$10,$13 |
| |
| addiu $5,$5,16 |
| or $8,$14,$9 |
| bgtz $6,.Loop |
| sw $8,-4($4) |
| |
| .Lend: srl $8,$10,$7 |
| j $31 |
| sw $8,0($4) |
| EPILOGUE(mpn_rshift) |