mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
63 lines
1.6 KiB
ArmAsm
63 lines
1.6 KiB
ArmAsm
/* 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; 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 C 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 C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#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))
|