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b920de1b DH |
1 | /* MN10300 64-bit arithmetic 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 | #include <asm/cache.h> | |
12 | ||
13 | .text | |
14 | .balign L1_CACHE_BYTES | |
15 | ||
16 | ############################################################################### | |
17 | # | |
18 | # unsigned long long __ashrdi3(unsigned long long value [D1:D0], | |
19 | # unsigned by [(12,SP)]) | |
20 | # | |
21 | ############################################################################### | |
22 | .globl __ashrdi3 | |
23 | .type __ashrdi3,@function | |
24 | __ashrdi3: | |
25 | mov (12,sp),a0 | |
26 | and +63,a0 | |
27 | beq __ashrdi3_zero | |
28 | ||
29 | cmp +31,a0 | |
30 | bhi __ashrdi3_32plus | |
31 | ||
32 | # the count is in the range 1-31 | |
33 | lsr a0,d0 | |
34 | ||
35 | mov +32,a1 | |
36 | sub a0,a1,a1 # a1 = 32 - count | |
37 | asl a1,d1,a1 # get underflow from MSW -> LSW | |
38 | ||
39 | or_asr a1,d0,a0,d1 # insert underflow into LSW and | |
40 | # shift the MSW | |
41 | rets | |
42 | ||
43 | .balign L1_CACHE_BYTES | |
44 | # the count is in the range 32-63 | |
45 | __ashrdi3_32plus: | |
46 | asr a0,d1,d0 | |
47 | ext d0 # sign-extend result through MDR | |
48 | mov mdr,d1 | |
49 | __ashrdi3_zero: | |
50 | rets | |
51 | ||
52 | .size __ashrdi3, .-__ashrdi3 |