blob: db5b6dc37a11a74c545ea93f8afb9271f71f15d0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* __ashldi3.S: 64-bit arithmetic shift left
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 __ashldi3(unsigned long long value [GR8:GR9], unsigned by [GR10])
18#
19###############################################################################
20 .globl __ashldi3
21 .type __ashldi3,@function
22__ashldi3:
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 csll.p gr8,gr10,gr8 ,cc4,#1 ; MSW <<= N
31 csub gr5,gr10,gr5 ,cc4,#1 ; M = 32 - N
32 csrl.p gr9,gr5,gr4 ,cc4,#1
33 csll gr9,gr10,gr9 ,cc4,#1 ; LSW <<= N
34 cor.p gr4,gr8,gr8 ,cc4,#1 ; MSW |= LSW >> M
35
36 # deal with a shift in the range 32<=N<=63
37 csll gr9,gr10,gr8 ,cc4,#0 ; MSW = LSW << (N & 31 [implicit AND])
38 cor.p gr0,gr0,gr9 ,cc4,#0 ; LSW = 0
39 bralr
40 .size __ashldi3, .-__ashldi3