| /* MIPS3 __mpn_rshift -- |
| * |
| * Copyright (C) 1995-2014 Free Software Foundation, Inc. |
| * |
| * This file is part of the GNU MP Library. |
| * |
| * The GNU MP Library is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as published by |
| * the Free Software Foundation; either version 2.1 of the License, or (at your |
| * option) any later version. |
| * |
| * The GNU MP Library is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
| * License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public License |
| * along with the GNU MP Library. If not, see |
| * <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <sysdep.h> |
| #include <sys/asm.h> |
| |
| /* INPUT PARAMETERS |
| * res_ptr $4 |
| * src_ptr $5 |
| * size $6 |
| * cnt $7 |
| */ |
| |
| #ifdef __PIC__ |
| .option pic2 |
| #endif |
| ENTRY (__mpn_rshift) |
| #ifdef __PIC__ |
| SETUP_GP /* ??? unused */ |
| #endif |
| .set noreorder |
| .set nomacro |
| |
| ld $10,0($5) # load first limb |
| dsubu $13,$0,$7 |
| daddiu $6,$6,-1 |
| and $9,$6,4-1 # number of limbs in first loop |
| beq $9,$0,L(L0) # if multiple of 4 limbs, skip first loop |
| dsll $2,$10,$13 # compute function result |
| |
| dsubu $6,$6,$9 |
| |
| L(Loop0): ld $3,8($5) |
| daddiu $4,$4,8 |
| daddiu $5,$5,8 |
| daddiu $9,$9,-1 |
| dsrl $11,$10,$7 |
| dsll $12,$3,$13 |
| move $10,$3 |
| or $8,$11,$12 |
| bne $9,$0,L(Loop0) |
| sd $8,-8($4) |
| |
| L(L0): beq $6,$0,L(Lend) |
| nop |
| |
| L(Loop): ld $3,8($5) |
| daddiu $4,$4,32 |
| daddiu $6,$6,-4 |
| dsrl $11,$10,$7 |
| dsll $12,$3,$13 |
| |
| ld $10,16($5) |
| dsrl $14,$3,$7 |
| or $8,$11,$12 |
| sd $8,-32($4) |
| dsll $9,$10,$13 |
| |
| ld $3,24($5) |
| dsrl $11,$10,$7 |
| or $8,$14,$9 |
| sd $8,-24($4) |
| dsll $12,$3,$13 |
| |
| ld $10,32($5) |
| dsrl $14,$3,$7 |
| or $8,$11,$12 |
| sd $8,-16($4) |
| dsll $9,$10,$13 |
| |
| daddiu $5,$5,32 |
| or $8,$14,$9 |
| bgtz $6,L(Loop) |
| sd $8,-8($4) |
| |
| L(Lend): dsrl $8,$10,$7 |
| j $31 |
| sd $8,0($4) |
| END (__mpn_rshift) |
