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/* SPARC v9 __mpn_rshift --
Copyright (C) 1996, 1999 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 Library General Public License as published by
the Free Software Foundation; either version 2 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 Library General Public
License for more details.
You should have received a copy of the GNU Library 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. */
#include <sysdep.h>
/* INPUT PARAMETERS
res_ptr %o0
src_ptr %o1
size %o2
cnt %o3 */
.register %g2, #scratch
.register %g3, #scratch
ENTRY(__mpn_rshift)
ldx [%o1],%g2 ! load first limb
sub %g0,%o3,%o5 ! negate shift count
add %o2,-1,%o2
andcc %o2,4-1,%g4 ! number of limbs in first loop
sllx %g2,%o5,%g1 ! compute function result
be,pn %xcc,.L0 ! if multiple of 4 limbs, skip first loop
mov %g1,%g5
sub %o2,%g4,%o2 ! adjust count for main loop
.Loop0: ldx [%o1+8],%g3
add %o0,8,%o0
add %o1,8,%o1
srlx %g2,%o3,%o4
addcc %g4,-1,%g4
sllx %g3,%o5,%g1
mov %g3,%g2
or %o4,%g1,%o4
bne,pt %xcc,.Loop0
stx %o4,[%o0-8]
.L0: brz,pn %o2,.Lend
nop
.Loop: ldx [%o1+8],%g3
add %o0,32,%o0
srlx %g2,%o3,%o4
addcc %o2,-4,%o2
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
bne,pt %xcc,.Loop
stx %g4,[%o0-8]
.Lend: srlx %g2,%o3,%g2
stx %g2,[%o0-0]
jmpl %o7+8,%g0
mov %g5,%o0
END(__mpn_rshift)
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