| # Alpha EV5 __mpn_rshift -- |
| |
| # Copyright (C) 1994-2014 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/>. |
| |
| |
| # INPUT PARAMETERS |
| # res_ptr r16 |
| # s1_ptr r17 |
| # size r18 |
| # cnt r19 |
| |
| # This code runs at 3.25 cycles/limb on the EV5. |
| |
| .set noreorder |
| .set noat |
| .text |
| .align 3 |
| .globl __mpn_rshift |
| .ent __mpn_rshift |
| __mpn_rshift: |
| .frame $30,0,$26,0 |
| |
| ldq $4,0($17) # load first limb |
| subq $31,$19,$20 |
| subq $18,1,$18 |
| and $18,4-1,$28 # number of limbs in first loop |
| sll $4,$20,$0 # compute function result |
| |
| beq $28,.L0 |
| subq $18,$28,$18 |
| |
| .align 3 |
| .Loop0: ldq $3,8($17) |
| addq $16,8,$16 |
| srl $4,$19,$5 |
| addq $17,8,$17 |
| subq $28,1,$28 |
| sll $3,$20,$6 |
| or $3,$3,$4 |
| or $5,$6,$8 |
| stq $8,-8($16) |
| bne $28,.Loop0 |
| |
| .L0: srl $4,$19,$24 |
| beq $18,.Lend |
| # warm up phase 1 |
| ldq $1,8($17) |
| subq $18,4,$18 |
| ldq $2,16($17) |
| ldq $3,24($17) |
| ldq $4,32($17) |
| beq $18,.Lend1 |
| # warm up phase 2 |
| sll $1,$20,$7 |
| srl $1,$19,$21 |
| sll $2,$20,$8 |
| ldq $1,40($17) |
| srl $2,$19,$22 |
| ldq $2,48($17) |
| sll $3,$20,$5 |
| or $7,$24,$7 |
| srl $3,$19,$23 |
| or $8,$21,$8 |
| sll $4,$20,$6 |
| ldq $3,56($17) |
| srl $4,$19,$24 |
| ldq $4,64($17) |
| subq $18,4,$18 |
| beq $18,.Lend2 |
| .align 4 |
| # main loop |
| .Loop: stq $7,0($16) |
| or $5,$22,$5 |
| stq $8,8($16) |
| or $6,$23,$6 |
| |
| sll $1,$20,$7 |
| subq $18,4,$18 |
| srl $1,$19,$21 |
| unop # ldq $31,-96($17) |
| |
| sll $2,$20,$8 |
| ldq $1,72($17) |
| srl $2,$19,$22 |
| ldq $2,80($17) |
| |
| stq $5,16($16) |
| or $7,$24,$7 |
| stq $6,24($16) |
| or $8,$21,$8 |
| |
| sll $3,$20,$5 |
| unop # ldq $31,-96($17) |
| srl $3,$19,$23 |
| addq $16,32,$16 |
| |
| sll $4,$20,$6 |
| ldq $3,88($17) |
| srl $4,$19,$24 |
| ldq $4,96($17) |
| |
| addq $17,32,$17 |
| bne $18,.Loop |
| # cool down phase 2/1 |
| .Lend2: stq $7,0($16) |
| or $5,$22,$5 |
| stq $8,8($16) |
| or $6,$23,$6 |
| sll $1,$20,$7 |
| srl $1,$19,$21 |
| sll $2,$20,$8 |
| srl $2,$19,$22 |
| stq $5,16($16) |
| or $7,$24,$7 |
| stq $6,24($16) |
| or $8,$21,$8 |
| sll $3,$20,$5 |
| srl $3,$19,$23 |
| sll $4,$20,$6 |
| srl $4,$19,$24 |
| # cool down phase 2/2 |
| stq $7,32($16) |
| or $5,$22,$5 |
| stq $8,40($16) |
| or $6,$23,$6 |
| stq $5,48($16) |
| stq $6,56($16) |
| # cool down phase 2/3 |
| stq $24,64($16) |
| ret $31,($26),1 |
| |
| # cool down phase 1/1 |
| .Lend1: sll $1,$20,$7 |
| srl $1,$19,$21 |
| sll $2,$20,$8 |
| srl $2,$19,$22 |
| sll $3,$20,$5 |
| or $7,$24,$7 |
| srl $3,$19,$23 |
| or $8,$21,$8 |
| sll $4,$20,$6 |
| srl $4,$19,$24 |
| # cool down phase 1/2 |
| stq $7,0($16) |
| or $5,$22,$5 |
| stq $8,8($16) |
| or $6,$23,$6 |
| stq $5,16($16) |
| stq $6,24($16) |
| stq $24,32($16) |
| ret $31,($26),1 |
| |
| .Lend: stq $24,0($16) |
| ret $31,($26),1 |
| .end __mpn_rshift |
