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1.1 ! maekawa 1: dnl Alpha EV5 __gmpn_rshift -- Shift a number right.
! 2:
! 3: dnl Copyright (C) 1994, 1995, 2000 Free Software Foundation, Inc.
! 4:
! 5: dnl This file is part of the GNU MP Library.
! 6:
! 7: dnl The GNU MP Library is free software; you can redistribute it and/or modify
! 8: dnl it under the terms of the GNU Lesser General Public License as published by
! 9: dnl the Free Software Foundation; either version 2.1 of the License, or (at your
! 10: dnl option) any later version.
! 11:
! 12: dnl The GNU MP Library is distributed in the hope that it will be useful, but
! 13: dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 14: dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
! 15: dnl License for more details.
! 16:
! 17: dnl You should have received a copy of the GNU Lesser General Public License
! 18: dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write to
! 19: dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
! 20: dnl MA 02111-1307, USA.
! 21:
! 22: include(`../config.m4')
! 23:
! 24: dnl INPUT PARAMETERS
! 25: dnl res_ptr r16
! 26: dnl s1_ptr r17
! 27: dnl size r18
! 28: dnl cnt r19
! 29:
! 30: dnl This code runs at 3.25 cycles/limb on the EV5.
! 31:
! 32: ASM_START()
! 33: PROLOGUE(mpn_rshift)
! 34: ldq r4,0(r17) C load first limb
! 35: subq r31,r19,r20
! 36: subq r18,1,r18
! 37: and r18,4-1,r28 C number of limbs in first loop
! 38: sll r4,r20,r0 C compute function result
! 39:
! 40: beq r28,$L0
! 41: subq r18,r28,r18
! 42:
! 43: ALIGN(8)
! 44: $Loop0: ldq r3,8(r17)
! 45: addq r16,8,r16
! 46: srl r4,r19,r5
! 47: addq r17,8,r17
! 48: subq r28,1,r28
! 49: sll r3,r20,r6
! 50: bis r3,r3,r4
! 51: bis r5,r6,r8
! 52: stq r8,-8(r16)
! 53: bne r28,$Loop0
! 54:
! 55: $L0: srl r4,r19,r24
! 56: beq r18,$Lend
! 57: C warm up phase 1
! 58: ldq r1,8(r17)
! 59: subq r18,4,r18
! 60: ldq r2,16(r17)
! 61: ldq r3,24(r17)
! 62: ldq r4,32(r17)
! 63: beq r18,$Lend1
! 64: C warm up phase 2
! 65: sll r1,r20,r7
! 66: srl r1,r19,r21
! 67: sll r2,r20,r8
! 68: ldq r1,40(r17)
! 69: srl r2,r19,r22
! 70: ldq r2,48(r17)
! 71: sll r3,r20,r5
! 72: bis r7,r24,r7
! 73: srl r3,r19,r23
! 74: bis r8,r21,r8
! 75: sll r4,r20,r6
! 76: ldq r3,56(r17)
! 77: srl r4,r19,r24
! 78: ldq r4,64(r17)
! 79: subq r18,4,r18
! 80: beq r18,$Lend2
! 81: ALIGN(16)
! 82: C main loop
! 83: $Loop: stq r7,0(r16)
! 84: bis r5,r22,r5
! 85: stq r8,8(r16)
! 86: bis r6,r23,r6
! 87:
! 88: sll r1,r20,r7
! 89: subq r18,4,r18
! 90: srl r1,r19,r21
! 91: unop C ldq r31,-96(r17)
! 92:
! 93: sll r2,r20,r8
! 94: ldq r1,72(r17)
! 95: srl r2,r19,r22
! 96: ldq r2,80(r17)
! 97:
! 98: stq r5,16(r16)
! 99: bis r7,r24,r7
! 100: stq r6,24(r16)
! 101: bis r8,r21,r8
! 102:
! 103: sll r3,r20,r5
! 104: unop C ldq r31,-96(r17)
! 105: srl r3,r19,r23
! 106: addq r16,32,r16
! 107:
! 108: sll r4,r20,r6
! 109: ldq r3,88(r17)
! 110: srl r4,r19,r24
! 111: ldq r4,96(r17)
! 112:
! 113: addq r17,32,r17
! 114: bne r18,$Loop
! 115: C cool down phase 2/1
! 116: $Lend2: stq r7,0(r16)
! 117: bis r5,r22,r5
! 118: stq r8,8(r16)
! 119: bis r6,r23,r6
! 120: sll r1,r20,r7
! 121: srl r1,r19,r21
! 122: sll r2,r20,r8
! 123: srl r2,r19,r22
! 124: stq r5,16(r16)
! 125: bis r7,r24,r7
! 126: stq r6,24(r16)
! 127: bis r8,r21,r8
! 128: sll r3,r20,r5
! 129: srl r3,r19,r23
! 130: sll r4,r20,r6
! 131: srl r4,r19,r24
! 132: C cool down phase 2/2
! 133: stq r7,32(r16)
! 134: bis r5,r22,r5
! 135: stq r8,40(r16)
! 136: bis r6,r23,r6
! 137: stq r5,48(r16)
! 138: stq r6,56(r16)
! 139: C cool down phase 2/3
! 140: stq r24,64(r16)
! 141: ret r31,(r26),1
! 142:
! 143: C cool down phase 1/1
! 144: $Lend1: sll r1,r20,r7
! 145: srl r1,r19,r21
! 146: sll r2,r20,r8
! 147: srl r2,r19,r22
! 148: sll r3,r20,r5
! 149: bis r7,r24,r7
! 150: srl r3,r19,r23
! 151: bis r8,r21,r8
! 152: sll r4,r20,r6
! 153: srl r4,r19,r24
! 154: C cool down phase 1/2
! 155: stq r7,0(r16)
! 156: bis r5,r22,r5
! 157: stq r8,8(r16)
! 158: bis r6,r23,r6
! 159: stq r5,16(r16)
! 160: stq r6,24(r16)
! 161: stq r24,32(r16)
! 162: ret r31,(r26),1
! 163:
! 164: $Lend: stq r24,0(r16)
! 165: ret r31,(r26),1
! 166: EPILOGUE(mpn_rshift)
! 167: ASM_END()