64 lines
1.7 KiB
ArmAsm
64 lines
1.7 KiB
ArmAsm
/* Shift a limb right, low level routine.
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Copyright (C) 1995, 1997, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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#include <bp-sym.h>
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#include <bp-asm.h>
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/* INPUT PARAMETERS
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res_ptr r3
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s1_ptr r4
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size r5
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cnt r6 */
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ENTRY (BP_SYM (__mpn_rshift))
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#if __BOUNDED_POINTERS__
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slwi r10,r5,2 /* convert limbs to bytes */
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CHECK_BOUNDS_BOTH_WIDE (r3, r8, r9, r10)
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CHECK_BOUNDS_BOTH_WIDE (r4, r8, r9, r10)
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#endif
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mtctr r5 # copy size into CTR
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addi r7,r3,-4 # move adjusted res_ptr to free return reg
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subfic r8,r6,32
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lwz r11,0(r4) # load first s1 limb
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slw r3,r11,r8 # compute function return value
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bdz L(1)
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L(0): lwzu r10,4(r4)
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srw r9,r11,r6
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slw r12,r10,r8
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or r9,r9,r12
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stwu r9,4(r7)
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bdz L(2)
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lwzu r11,4(r4)
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srw r9,r10,r6
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slw r12,r11,r8
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or r9,r9,r12
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stwu r9,4(r7)
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bdnz L(0)
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L(1): srw r0,r11,r6
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stw r0,4(r7)
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blr
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L(2): srw r0,r10,r6
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stw r0,4(r7)
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blr
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END (BP_SYM (__mpn_rshift))
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