85 lines
2.1 KiB
NASM
85 lines
2.1 KiB
NASM
dnl HP-PA mpn_rshift -- Shift a number right.
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dnl Optimized for the PA7100, where is runs at 3.25 cycles/limb.
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dnl Copyright 1992, 1994, 2000, 2001, 2002, 2003 Free Software Foundation,
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dnl 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 INPUT PARAMETERS
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C res_ptr r26
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C s_ptr r25
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C size r24
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C cnt r23
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ASM_START()
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PROLOGUE(mpn_rshift)
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ldws,ma 4(0,%r25),%r22
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mtsar %r23
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addib,= -1,%r24,L(0004)
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vshd %r22,%r0,%r28 C compute carry out limb
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ldws,ma 4(0,%r25),%r29
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addib,<= -5,%r24,L(rest)
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vshd %r29,%r22,%r20
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LDEF(loop)
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ldws,ma 4(0,%r25),%r22
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stws,ma %r20,4(0,%r26)
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vshd %r22,%r29,%r20
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ldws,ma 4(0,%r25),%r29
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stws,ma %r20,4(0,%r26)
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vshd %r29,%r22,%r20
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ldws,ma 4(0,%r25),%r22
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stws,ma %r20,4(0,%r26)
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vshd %r22,%r29,%r20
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ldws,ma 4(0,%r25),%r29
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stws,ma %r20,4(0,%r26)
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addib,> -4,%r24,L(loop)
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vshd %r29,%r22,%r20
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LDEF(rest)
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addib,= 4,%r24,L(end1)
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nop
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LDEF(eloop)
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ldws,ma 4(0,%r25),%r22
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stws,ma %r20,4(0,%r26)
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addib,<= -1,%r24,L(end2)
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vshd %r22,%r29,%r20
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ldws,ma 4(0,%r25),%r29
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stws,ma %r20,4(0,%r26)
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addib,> -1,%r24,L(eloop)
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vshd %r29,%r22,%r20
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LDEF(end1)
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stws,ma %r20,4(0,%r26)
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vshd %r0,%r29,%r20
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bv 0(%r2)
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stw %r20,0(0,%r26)
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LDEF(end2)
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stws,ma %r20,4(0,%r26)
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LDEF(0004)
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vshd %r0,%r22,%r20
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bv 0(%r2)
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stw %r20,0(0,%r26)
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EPILOGUE()
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