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1.1 ! maekawa 1: # Alpha EV5 __mpn_rshift --
! 2:
! 3: # Copyright (C) 1994, 1995 Free Software Foundation, Inc.
! 4:
! 5: # This file is part of the GNU MP Library.
! 6:
! 7: # The GNU MP Library is free software; you can redistribute it and/or modify
! 8: # it under the terms of the GNU Library General Public License as published by
! 9: # the Free Software Foundation; either version 2 of the License, or (at your
! 10: # option) any later version.
! 11:
! 12: # The GNU MP Library is distributed in the hope that it will be useful, but
! 13: # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 14: # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
! 15: # License for more details.
! 16:
! 17: # You should have received a copy of the GNU Library General Public License
! 18: # along with the GNU MP Library; see the file COPYING.LIB. If not, write to
! 19: # the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
! 20: # MA 02111-1307, USA.
! 21:
! 22:
! 23: # INPUT PARAMETERS
! 24: # res_ptr r16
! 25: # s1_ptr r17
! 26: # size r18
! 27: # cnt r19
! 28:
! 29: # This code runs at 3.25 cycles/limb on the EV5.
! 30:
! 31: .set noreorder
! 32: .set noat
! 33: .text
! 34: .align 3
! 35: .globl __mpn_rshift
! 36: .ent __mpn_rshift
! 37: __mpn_rshift:
! 38: .frame $30,0,$26,0
! 39:
! 40: ldq $4,0($17) # load first limb
! 41: subq $31,$19,$20
! 42: subq $18,1,$18
! 43: and $18,4-1,$28 # number of limbs in first loop
! 44: sll $4,$20,$0 # compute function result
! 45:
! 46: beq $28,.L0
! 47: subq $18,$28,$18
! 48:
! 49: .align 3
! 50: .Loop0: ldq $3,8($17)
! 51: addq $16,8,$16
! 52: srl $4,$19,$5
! 53: addq $17,8,$17
! 54: subq $28,1,$28
! 55: sll $3,$20,$6
! 56: or $3,$3,$4
! 57: or $5,$6,$8
! 58: stq $8,-8($16)
! 59: bne $28,.Loop0
! 60:
! 61: .L0: srl $4,$19,$24
! 62: beq $18,.Lend
! 63: # warm up phase 1
! 64: ldq $1,8($17)
! 65: subq $18,4,$18
! 66: ldq $2,16($17)
! 67: ldq $3,24($17)
! 68: ldq $4,32($17)
! 69: beq $18,.Lend1
! 70: # warm up phase 2
! 71: sll $1,$20,$7
! 72: srl $1,$19,$21
! 73: sll $2,$20,$8
! 74: ldq $1,40($17)
! 75: srl $2,$19,$22
! 76: ldq $2,48($17)
! 77: sll $3,$20,$5
! 78: or $7,$24,$7
! 79: srl $3,$19,$23
! 80: or $8,$21,$8
! 81: sll $4,$20,$6
! 82: ldq $3,56($17)
! 83: srl $4,$19,$24
! 84: ldq $4,64($17)
! 85: subq $18,4,$18
! 86: beq $18,.Lend2
! 87: .align 4
! 88: # main loop
! 89: .Loop: stq $7,0($16)
! 90: or $5,$22,$5
! 91: stq $8,8($16)
! 92: or $6,$23,$6
! 93:
! 94: sll $1,$20,$7
! 95: subq $18,4,$18
! 96: srl $1,$19,$21
! 97: unop # ldq $31,-96($17)
! 98:
! 99: sll $2,$20,$8
! 100: ldq $1,72($17)
! 101: srl $2,$19,$22
! 102: ldq $2,80($17)
! 103:
! 104: stq $5,16($16)
! 105: or $7,$24,$7
! 106: stq $6,24($16)
! 107: or $8,$21,$8
! 108:
! 109: sll $3,$20,$5
! 110: unop # ldq $31,-96($17)
! 111: srl $3,$19,$23
! 112: addq $16,32,$16
! 113:
! 114: sll $4,$20,$6
! 115: ldq $3,88($17)
! 116: srl $4,$19,$24
! 117: ldq $4,96($17)
! 118:
! 119: addq $17,32,$17
! 120: bne $18,.Loop
! 121: # cool down phase 2/1
! 122: .Lend2: stq $7,0($16)
! 123: or $5,$22,$5
! 124: stq $8,8($16)
! 125: or $6,$23,$6
! 126: sll $1,$20,$7
! 127: srl $1,$19,$21
! 128: sll $2,$20,$8
! 129: srl $2,$19,$22
! 130: stq $5,16($16)
! 131: or $7,$24,$7
! 132: stq $6,24($16)
! 133: or $8,$21,$8
! 134: sll $3,$20,$5
! 135: srl $3,$19,$23
! 136: sll $4,$20,$6
! 137: srl $4,$19,$24
! 138: # cool down phase 2/2
! 139: stq $7,32($16)
! 140: or $5,$22,$5
! 141: stq $8,40($16)
! 142: or $6,$23,$6
! 143: stq $5,48($16)
! 144: stq $6,56($16)
! 145: # cool down phase 2/3
! 146: stq $24,64($16)
! 147: ret $31,($26),1
! 148:
! 149: # cool down phase 1/1
! 150: .Lend1: sll $1,$20,$7
! 151: srl $1,$19,$21
! 152: sll $2,$20,$8
! 153: srl $2,$19,$22
! 154: sll $3,$20,$5
! 155: or $7,$24,$7
! 156: srl $3,$19,$23
! 157: or $8,$21,$8
! 158: sll $4,$20,$6
! 159: srl $4,$19,$24
! 160: # cool down phase 1/2
! 161: stq $7,0($16)
! 162: or $5,$22,$5
! 163: stq $8,8($16)
! 164: or $6,$23,$6
! 165: stq $5,16($16)
! 166: stq $6,24($16)
! 167: stq $24,32($16)
! 168: ret $31,($26),1
! 169:
! 170: .Lend: stq $24,0($16)
! 171: ret $31,($26),1
! 172: .end __mpn_rshift