projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* __lshrdi3.S: 64-bit logical shift right |
| 2 | * | |
| 3 | * Copyright (C) 2003 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 License | |
| 8 | * as published by the Free Software Foundation; either version | |
| 9 | * 2 of the License, or (at your option) any later version. | |
| 10 | */ | |
| 11 | ||
| 12 | .text | |
| 13 | .p2align 4 | |
| 14 | ||
| 15 | ############################################################################### | |
| 16 | # | |
| 17 | # unsigned long long __lshrdi3(unsigned long long value [GR8:GR9], unsigned by [GR10]) | |
| 18 | # | |
| 19 | ############################################################################### | |
| 20 | .globl __lshrdi3 | |
| 21 | .type __lshrdi3,@function | |
| 22 | __lshrdi3: | |
| 23 | andicc.p gr10,#63,gr10,icc0 | |
| 24 | setlos #32,gr5 | |
| 25 | andicc.p gr10,#32,gr0,icc1 | |
| 26 | beqlr icc0,#0 | |
| 27 | ckeq icc1,cc4 ; cc4 is true if 0<N<32 | |
| 28 | ||
| 29 | # deal with a shift in the range 1<=N<=31 | |
| 30 | csrl.p gr9,gr10,gr9 ,cc4,#1 ; LSW >>= N | |
| 31 | csub gr5,gr10,gr5 ,cc4,#1 ; M = 32 - N | |
| 32 | csll.p gr8,gr5,gr4 ,cc4,#1 | |
| 33 | csrl gr8,gr10,gr8 ,cc4,#1 ; MSW >>= N | |
| 34 | cor.p gr4,gr9,gr9 ,cc4,#1 ; LSW |= MSW << M | |
| 35 | ||
| 36 | # deal with a shift in the range 32<=N<=63 | |
| 37 | csrl gr8,gr10,gr9 ,cc4,#0 ; LSW = MSW >> (N & 31 [implicit AND]) | |
| 38 | cor.p gr0,gr0,gr8 ,cc4,#0 ; MSW = 0 | |
| 39 | bralr | |
| 40 | .size __lshrdi3, .-__lshrdi3 |