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David Howellsb920de12008-02-08 04:19:31 -08001/* 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