| David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 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 |