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1da177e4 LT |
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 |