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- # Alpha EV5 __mpn_rshift --
-
- # Copyright (C) 1994, 1995 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; see the file COPYING.LIB. If not, write to
- # the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- # MA 02111-1307, USA.
-
-
- # 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