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dnl HP-PA mpn_rshift -- Shift a number right.
dnl Optimized for the PA7100, where is runs at 3.25 cycles/limb.
dnl Copyright 1992, 1994, 2000-2003 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C INPUT PARAMETERS
C res_ptr r26
C s_ptr r25
C size r24
C cnt r23
ASM_START()
PROLOGUE(mpn_rshift)
ldws,ma 4(0,%r25),%r22
mtsar %r23
addib,= -1,%r24,L(0004)
vshd %r22,%r0,%r28 C compute carry out limb
ldws,ma 4(0,%r25),%r29
addib,<= -5,%r24,L(rest)
vshd %r29,%r22,%r20
LDEF(loop)
ldws,ma 4(0,%r25),%r22
stws,ma %r20,4(0,%r26)
vshd %r22,%r29,%r20
ldws,ma 4(0,%r25),%r29
stws,ma %r20,4(0,%r26)
vshd %r29,%r22,%r20
ldws,ma 4(0,%r25),%r22
stws,ma %r20,4(0,%r26)
vshd %r22,%r29,%r20
ldws,ma 4(0,%r25),%r29
stws,ma %r20,4(0,%r26)
addib,> -4,%r24,L(loop)
vshd %r29,%r22,%r20
LDEF(rest)
addib,= 4,%r24,L(end1)
nop
LDEF(eloop)
ldws,ma 4(0,%r25),%r22
stws,ma %r20,4(0,%r26)
addib,<= -1,%r24,L(end2)
vshd %r22,%r29,%r20
ldws,ma 4(0,%r25),%r29
stws,ma %r20,4(0,%r26)
addib,> -1,%r24,L(eloop)
vshd %r29,%r22,%r20
LDEF(end1)
stws,ma %r20,4(0,%r26)
vshd %r0,%r29,%r20
bv 0(%r2)
stw %r20,0(0,%r26)
LDEF(end2)
stws,ma %r20,4(0,%r26)
LDEF(0004)
vshd %r0,%r22,%r20
bv 0(%r2)
stw %r20,0(0,%r26)
EPILOGUE()
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