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174 lines
3.3 KiB
ArmAsm
174 lines
3.3 KiB
ArmAsm
# Alpha EV5 __mpn_lshift --
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# Copyright (C) 1994, 1995 Free Software Foundation, Inc.
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# This file is part of the GNU MP Library.
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# The GNU MP Library is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Library General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or (at your
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# option) any later version.
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# The GNU MP Library is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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# License for more details.
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# You should have received a copy of the GNU Library General Public License
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# along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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# the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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# INPUT PARAMETERS
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# res_ptr r16
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# s1_ptr r17
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# size r18
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# cnt r19
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# This code runs at 3.25 cycles/limb on the EV5.
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.set noreorder
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.set noat
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.text
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.align 3
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.globl __mpn_lshift
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.ent __mpn_lshift
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__mpn_lshift:
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.frame $30,0,$26,0
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s8addq $18,$17,$17 # make r17 point at end of s1
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ldq $4,-8($17) # load first limb
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subq $31,$19,$20
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s8addq $18,$16,$16 # make r16 point at end of RES
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subq $18,1,$18
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and $18,4-1,$28 # number of limbs in first loop
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srl $4,$20,$0 # compute function result
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beq $28,.L0
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subq $18,$28,$18
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.align 3
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.Loop0: ldq $3,-16($17)
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subq $16,8,$16
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sll $4,$19,$5
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subq $17,8,$17
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subq $28,1,$28
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srl $3,$20,$6
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or $3,$3,$4
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or $5,$6,$8
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stq $8,0($16)
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bne $28,.Loop0
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.L0: sll $4,$19,$24
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beq $18,.Lend
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# warm up phase 1
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ldq $1,-16($17)
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subq $18,4,$18
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ldq $2,-24($17)
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ldq $3,-32($17)
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ldq $4,-40($17)
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beq $18,.Lend1
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# warm up phase 2
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srl $1,$20,$7
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sll $1,$19,$21
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srl $2,$20,$8
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ldq $1,-48($17)
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sll $2,$19,$22
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ldq $2,-56($17)
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srl $3,$20,$5
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or $7,$24,$7
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sll $3,$19,$23
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or $8,$21,$8
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srl $4,$20,$6
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ldq $3,-64($17)
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sll $4,$19,$24
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ldq $4,-72($17)
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subq $18,4,$18
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beq $18,.Lend2
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.align 4
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# main loop
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.Loop: stq $7,-8($16)
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or $5,$22,$5
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stq $8,-16($16)
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or $6,$23,$6
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srl $1,$20,$7
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subq $18,4,$18
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sll $1,$19,$21
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unop # ldq $31,-96($17)
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srl $2,$20,$8
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ldq $1,-80($17)
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sll $2,$19,$22
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ldq $2,-88($17)
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stq $5,-24($16)
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or $7,$24,$7
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stq $6,-32($16)
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or $8,$21,$8
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srl $3,$20,$5
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unop # ldq $31,-96($17)
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sll $3,$19,$23
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subq $16,32,$16
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srl $4,$20,$6
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ldq $3,-96($17)
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sll $4,$19,$24
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ldq $4,-104($17)
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subq $17,32,$17
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bne $18,.Loop
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# cool down phase 2/1
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.Lend2: stq $7,-8($16)
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or $5,$22,$5
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stq $8,-16($16)
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or $6,$23,$6
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srl $1,$20,$7
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sll $1,$19,$21
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srl $2,$20,$8
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sll $2,$19,$22
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stq $5,-24($16)
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or $7,$24,$7
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stq $6,-32($16)
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or $8,$21,$8
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srl $3,$20,$5
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sll $3,$19,$23
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srl $4,$20,$6
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sll $4,$19,$24
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# cool down phase 2/2
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stq $7,-40($16)
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or $5,$22,$5
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stq $8,-48($16)
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or $6,$23,$6
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stq $5,-56($16)
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stq $6,-64($16)
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# cool down phase 2/3
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stq $24,-72($16)
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ret $31,($26),1
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# cool down phase 1/1
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.Lend1: srl $1,$20,$7
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sll $1,$19,$21
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srl $2,$20,$8
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sll $2,$19,$22
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srl $3,$20,$5
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or $7,$24,$7
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sll $3,$19,$23
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or $8,$21,$8
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srl $4,$20,$6
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sll $4,$19,$24
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# cool down phase 1/2
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stq $7,-8($16)
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or $5,$22,$5
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stq $8,-16($16)
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or $6,$23,$6
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stq $5,-24($16)
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stq $6,-32($16)
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stq $24,-40($16)
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ret $31,($26),1
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.Lend: stq $24,-8($16)
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ret $31,($26),1
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.end __mpn_lshift
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