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! SPARC v9 __gmpn_rshift --
! Copyright (C) 1996, 2000 Free Software Foundation, Inc.
! This file is part of the GNU MP Library.
! The GNU MP Library is free software; you can redistribute it and/or modify
! it under the terms of the GNU Lesser General Public License as published by
! the Free Software Foundation; either version 2.1 of the License, or (at your
! option) any later version.
! The GNU MP Library is distributed in the hope that it will be useful, but
! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
! License for more details.
! You should have received a copy of the GNU Lesser General Public License
! along with the GNU MP Library; see the file COPYING.LIB. If not, write to
! the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
! MA 02111-1307, USA.
! INPUT PARAMETERS
! res_ptr %o0
! src_ptr %o1
! size %o2
! cnt %o3
include(`../config.m4')
ASM_START()
.register %g2,#scratch
.register %g3,#scratch
PROLOGUE(mpn_rshift)
ldx [%o1],%g2 ! load first limb
sub %g0,%o3,%o5 ! negate shift count
add %o2,-1,%o2
and %o2,4-1,%g4 ! number of limbs in first loop
sllx %g2,%o5,%g1 ! compute function result
brz,pn %g4,L(0) ! if multiple of 4 limbs, skip first loop
mov %g1,%g5
sub %o2,%g4,%o2 ! adjust count for main loop
L(loop0):
ldx [%o1+8],%g3
add %o0,8,%o0
add %o1,8,%o1
add %g4,-1,%g4
srlx %g2,%o3,%o4
sllx %g3,%o5,%g1
mov %g3,%g2
or %o4,%g1,%o4
brnz,pt %g4,L(loop0)
stx %o4,[%o0-8]
L(0): brz,pn %o2,L(end)
nop
L(loop1):
ldx [%o1+8],%g3
add %o0,32,%o0
add %o2,-4,%o2
srlx %g2,%o3,%o4
sllx %g3,%o5,%g1
ldx [%o1+16],%g2
srlx %g3,%o3,%g4
or %o4,%g1,%o4
stx %o4,[%o0-32]
sllx %g2,%o5,%g1
ldx [%o1+24],%g3
srlx %g2,%o3,%o4
or %g4,%g1,%g4
stx %g4,[%o0-24]
sllx %g3,%o5,%g1
ldx [%o1+32],%g2
srlx %g3,%o3,%g4
or %o4,%g1,%o4
stx %o4,[%o0-16]
sllx %g2,%o5,%g1
add %o1,32,%o1
or %g4,%g1,%g4
brnz %o2,L(loop1)
stx %g4,[%o0-8]
L(end): srlx %g2,%o3,%g2
stx %g2,[%o0-0]
retl
mov %g5,%o0
EPILOGUE(mpn_rshift)
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