/* Shift a limb right, low level routine.
Copyright (C) 1995, 1997, 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY
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 C Library
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <bp-sym.h>
#include <bp-asm.h>
/* INPUT PARAMETERS
res_ptr r3
s1_ptr r4
size r5
cnt r6 */
ENTRY (BP_SYM (__mpn_rshift))
#if __BOUNDED_POINTERS__
slwi r10,r5,2 /* convert limbs to bytes */
CHECK_BOUNDS_BOTH_WIDE (r3, r8, r9, r10)
CHECK_BOUNDS_BOTH_WIDE (r4, r8, r9, r10)
#endif
mtctr r5 # copy size into CTR
addi r7,r3,-4 # move adjusted res_ptr to free return reg
subfic r8,r6,32
lwz r11,0(r4) # load first s1 limb
slw r3,r11,r8 # compute function return value
bdz L(1)
L(0): lwzu r10,4(r4)
srw r9,r11,r6
slw r12,r10,r8
or r9,r9,r12
stwu r9,4(r7)
bdz L(2)
lwzu r11,4(r4)
srw r9,r10,r6
slw r12,r11,r8
or r9,r9,r12
stwu r9,4(r7)
bdnz L(0)
L(1): srw r0,r11,r6
stw r0,4(r7)
blr
L(2): srw r0,r10,r6
stw r0,4(r7)
blr
END (BP_SYM (__mpn_rshift))
