projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 |