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dnl PowerPC-32 mpn_rshift -- Shift a number right.
dnl Copyright 1995, 2000 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published by
dnl the Free Software Foundation; either version 2.1 of the License, or (at your
dnl option) any later version.
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 Lesser General Public
dnl License for more details.
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write to
dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
dnl MA 02111-1307, USA.
dnl INPUT PARAMETERS
dnl res_ptr r3
dnl s1_ptr r4
dnl size r5
dnl cnt r6
include(`../config.m4')
ASM_START()
PROLOGUE(mpn_rshift)
mtctr r5 C copy size into CTR
addi r7,r3,-4 C move adjusted res_ptr to free return reg
subfic r8,r6,32
lwz r11,0(r4) C load first s1 limb
slw r3,r11,r8 C compute function return value
bdz .Lend1
.Loop: lwzu r10,4(r4)
srw r9,r11,r6
slw r12,r10,r8
or r9,r9,r12
stwu r9,4(r7)
bdz .Lend2
lwzu r11,4(r4)
srw r9,r10,r6
slw r12,r11,r8
or r9,r9,r12
stwu r9,4(r7)
bdnz .Loop
.Lend1: srw r0,r11,r6
stw r0,4(r7)
blr
.Lend2: srw r0,r10,r6
stw r0,4(r7)
blr
EPILOGUE(mpn_rshift)
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