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/arch/frv/lib/__ashrdi3.S

https://bitbucket.org/evzijst/gittest
Assembly | 41 lines | 37 code | 4 blank | 0 comment | 0 complexity | 625e915be4c053c2aedd02608fea3660 MD5 | raw file
 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