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171 lines
3.1 KiB
ArmAsm
171 lines
3.1 KiB
ArmAsm
# Alpha EV5 __mpn_rshift --
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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 Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 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 Lesser General Public
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# License for more details.
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# You should have received a copy of the GNU Lesser General Public License
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# along with the GNU MP Library. If not, see <http://www.gnu.org/licenses/>.
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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_rshift
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.ent __mpn_rshift
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__mpn_rshift:
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.frame $30,0,$26,0
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ldq $4,0($17) # load first limb
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subq $31,$19,$20
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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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sll $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 $3,8($17)
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addq $16,8,$16
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srl $4,$19,$5
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addq $17,8,$17
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subq $28,1,$28
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sll $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,-8($16)
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bne $28,.Loop0
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.L0: srl $4,$19,$24
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beq $18,.Lend
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# warm up phase 1
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ldq $1,8($17)
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subq $18,4,$18
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ldq $2,16($17)
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ldq $3,24($17)
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ldq $4,32($17)
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beq $18,.Lend1
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# warm up phase 2
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sll $1,$20,$7
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srl $1,$19,$21
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sll $2,$20,$8
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ldq $1,40($17)
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srl $2,$19,$22
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ldq $2,48($17)
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sll $3,$20,$5
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or $7,$24,$7
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srl $3,$19,$23
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or $8,$21,$8
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sll $4,$20,$6
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ldq $3,56($17)
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srl $4,$19,$24
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ldq $4,64($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 $7,0($16)
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or $5,$22,$5
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stq $8,8($16)
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or $6,$23,$6
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sll $1,$20,$7
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subq $18,4,$18
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srl $1,$19,$21
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unop # ldq $31,-96($17)
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sll $2,$20,$8
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ldq $1,72($17)
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srl $2,$19,$22
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ldq $2,80($17)
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stq $5,16($16)
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or $7,$24,$7
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stq $6,24($16)
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or $8,$21,$8
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sll $3,$20,$5
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unop # ldq $31,-96($17)
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srl $3,$19,$23
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addq $16,32,$16
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sll $4,$20,$6
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ldq $3,88($17)
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srl $4,$19,$24
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ldq $4,96($17)
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addq $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 $7,0($16)
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or $5,$22,$5
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stq $8,8($16)
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or $6,$23,$6
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sll $1,$20,$7
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srl $1,$19,$21
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sll $2,$20,$8
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srl $2,$19,$22
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stq $5,16($16)
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or $7,$24,$7
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stq $6,24($16)
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or $8,$21,$8
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sll $3,$20,$5
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srl $3,$19,$23
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sll $4,$20,$6
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srl $4,$19,$24
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# cool down phase 2/2
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stq $7,32($16)
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or $5,$22,$5
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stq $8,40($16)
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or $6,$23,$6
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stq $5,48($16)
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stq $6,56($16)
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# cool down phase 2/3
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stq $24,64($16)
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ret $31,($26),1
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# cool down phase 1/1
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.Lend1: sll $1,$20,$7
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srl $1,$19,$21
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sll $2,$20,$8
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srl $2,$19,$22
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sll $3,$20,$5
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or $7,$24,$7
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srl $3,$19,$23
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or $8,$21,$8
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sll $4,$20,$6
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srl $4,$19,$24
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# cool down phase 1/2
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stq $7,0($16)
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or $5,$22,$5
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stq $8,8($16)
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or $6,$23,$6
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stq $5,16($16)
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stq $6,24($16)
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stq $24,32($16)
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ret $31,($26),1
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.Lend: stq $24,0($16)
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ret $31,($26),1
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.end __mpn_rshift
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