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dnl SPARC mpn_rshift -- Shift a number right.
dnl Copyright 1995, 1996, 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
dnl by the Free Software Foundation; either version 3 of the License, or (at
dnl your 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. If not, see http://www.gnu.org/licenses/.
include(`../config.m4')
C INPUT PARAMETERS
C res_ptr %o0
C src_ptr %o1
C size %o2
C cnt %o3
ASM_START()
PROLOGUE(mpn_rshift)
ld [%o1],%g2 C load first limb
sub %g0,%o3,%o5 C negate shift count
add %o2,-1,%o2
andcc %o2,4-1,%g4 C number of limbs in first loop
sll %g2,%o5,%g1 C compute function result
be L(0) C if multiple of 4 limbs, skip first loop
st %g1,[%sp+80]
sub %o2,%g4,%o2 C adjust count for main loop
L(loop0):
ld [%o1+4],%g3
add %o0,4,%o0
add %o1,4,%o1
addcc %g4,-1,%g4
srl %g2,%o3,%o4
sll %g3,%o5,%g1
mov %g3,%g2
or %o4,%g1,%o4
bne L(loop0)
st %o4,[%o0-4]
L(0): tst %o2
be L(end)
nop
L(loop):
ld [%o1+4],%g3
add %o0,16,%o0
addcc %o2,-4,%o2
srl %g2,%o3,%o4
sll %g3,%o5,%g1
ld [%o1+8],%g2
srl %g3,%o3,%g4
or %o4,%g1,%o4
st %o4,[%o0-16]
sll %g2,%o5,%g1
ld [%o1+12],%g3
srl %g2,%o3,%o4
or %g4,%g1,%g4
st %g4,[%o0-12]
sll %g3,%o5,%g1
ld [%o1+16],%g2
srl %g3,%o3,%g4
or %o4,%g1,%o4
st %o4,[%o0-8]
sll %g2,%o5,%g1
add %o1,16,%o1
or %g4,%g1,%g4
bne L(loop)
st %g4,[%o0-4]
L(end): srl %g2,%o3,%g2
st %g2,[%o0-0]
retl
ld [%sp+80],%o0
EPILOGUE(mpn_rshift)
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