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b920de1b DH |
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 |