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/arch/mn10300/lib/__lshrdi3.S

http://github.com/mirrors/linux
Assembly | 52 lines | 43 code | 9 blank | 0 comment | 0 complexity | 2ca39c7b15d2ede4609a9908b01bc2af MD5 | raw file
 1/* MN10300 64-bit logical right shift
 2 *
 3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 4 * Written by David Howells (dhowells@redhat.com)
 5 *
 6 * This program is free software; you can redistribute it and/or
 7 * modify it under the terms of the GNU General Public Licence
 8 * as published by the Free Software Foundation; either version
 9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12#include <asm/cache.h>
13
14        .text
15        .balign	L1_CACHE_BYTES
16
17###############################################################################
18#
19# unsigned long long __lshrdi3(unsigned long long value [D1:D0],
20#			       unsigned by [(12,SP)])
21#
22###############################################################################
23        .globl	__lshrdi3
24        .type	__lshrdi3,@function
25__lshrdi3:
26	mov	(12,sp),a0
27	and	+63,a0
28	beq	__lshrdi3_zero
29
30	cmp	+31,a0
31	bhi	__lshrdi3_32plus
32
33	# the count is in the range 1-31
34	lsr	a0,d0
35
36	mov	+32,a1
37	sub	a0,a1,a1			# a1 = 32 - count
38	asl	a1,d1,a1			# get underflow from MSW -> LSW
39
40	or_lsr	a1,d0,a0,d1			# insert underflow into LSW and
41						# shift the MSW
42	rets
43
44	.balign	L1_CACHE_BYTES
45	# the count is in the range 32-63
46__lshrdi3_32plus:
47	lsr	a0,d1,d0
48	clr	d1
49__lshrdi3_zero:
50	rets
51
52	.size	__lshrdi3, .-__lshrdi3