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/* MIPS3 __mpn_rshift --
*
* Copyright (C) 1995-2023 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
* <https://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)
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