| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* __ashrdi3.S: 64-bit arithmetic 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 | # signed long long __ashrdi3(signed long long value [GR8:GR9], unsigned by [GR10]) |
| 18 | # |
| 19 | ############################################################################### |
| 20 | .globl __ashrdi3 |
| 21 | .type __ashrdi3,@function |
| 22 | __ashrdi3: |
| 23 | andicc.p gr10,#63,gr10,icc0 |
| 24 | setlos #32,gr5 |
| 25 | andicc.p gr10,#32,gr0,icc1 |
| 26 | beqlr icc0,#0 |
| 27 | setlos.p #31,gr6 |
| 28 | ckeq icc1,cc4 ; cc4 is true if 0<N<32 |
| 29 | |
| 30 | # deal with a shift in the range 1<=N<=31 |
| 31 | csrl.p gr9,gr10,gr9 ,cc4,#1 ; LSW >>= N |
| 32 | csub gr5,gr10,gr5 ,cc4,#1 ; M = 32 - N |
| 33 | csll.p gr8,gr5,gr4 ,cc4,#1 |
| 34 | csra gr8,gr10,gr8 ,cc4,#1 ; MSW >>= N |
| 35 | cor.p gr4,gr9,gr9 ,cc4,#1 ; LSW |= MSW << M |
| 36 | |
| 37 | # deal with a shift in the range 32<=N<=63 |
| 38 | csra gr8,gr10,gr9 ,cc4,#0 ; LSW = MSW >> (N & 31 [implicit AND]) |
| 39 | csra.p gr8,gr6,gr8 ,cc4,#0 ; MSW >>= 31 |
| 40 | bralr |
| 41 | .size __ashrdi3, .-__ashrdi3 |