98 lines
2.0 KiB
NASM
98 lines
2.0 KiB
NASM
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dnl Alpha mpn_rshift -- Shift a number right.
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dnl Copyright 1994, 1995, 2000, 2002 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C cycles/limb
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C EV4: 4.75
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C EV5: 3.75
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C EV6: 2
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C INPUT PARAMETERS
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C rp r16
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C up r17
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C n r18
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C cnt r19
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ASM_START()
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PROLOGUE(mpn_rshift)
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ldq r4,0(r17) C load first limb
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addq r17,8,r17
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subq r31,r19,r7
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subq r18,1,r18
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and r18,4-1,r20 C number of limbs in first loop
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sll r4,r7,r0 C compute function result
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beq r20,$L0
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subq r18,r20,r18
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ALIGN(8)
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$Loop0: ldq r3,0(r17)
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addq r16,8,r16
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addq r17,8,r17
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subq r20,1,r20
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srl r4,r19,r5
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sll r3,r7,r6
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bis r3,r3,r4
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bis r5,r6,r8
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stq r8,-8(r16)
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bne r20,$Loop0
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$L0: beq r18,$Lend
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ALIGN(8)
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$Loop: ldq r3,0(r17)
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addq r16,32,r16
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subq r18,4,r18
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srl r4,r19,r5
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sll r3,r7,r6
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ldq r4,8(r17)
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srl r3,r19,r1
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bis r5,r6,r8
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stq r8,-32(r16)
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sll r4,r7,r2
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ldq r3,16(r17)
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srl r4,r19,r5
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bis r1,r2,r8
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stq r8,-24(r16)
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sll r3,r7,r6
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ldq r4,24(r17)
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srl r3,r19,r1
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bis r5,r6,r8
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stq r8,-16(r16)
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sll r4,r7,r2
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addq r17,32,r17
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bis r1,r2,r8
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stq r8,-8(r16)
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bgt r18,$Loop
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$Lend: srl r4,r19,r8
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stq r8,0(r16)
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ret r31,(r26),1
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EPILOGUE(mpn_rshift)
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ASM_END()
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