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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/frv/lib/__ashrdi3.S
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/* __ashrdi3.S:	64-bit arithmetic shift right

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 *

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 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.

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 * Written by David Howells ([email protected])

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 *

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 * This program is free software; you can redistribute it and/or

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 * modify it under the terms of the GNU General Public License

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 * as published by the Free Software Foundation; either version

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 * 2 of the License, or (at your option) any later version.

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 */

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        .text

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        .p2align	4

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###############################################################################

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#

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# signed long long __ashrdi3(signed long long value [GR8:GR9], unsigned by [GR10])

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#

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###############################################################################

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        .globl		__ashrdi3

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        .type		__ashrdi3,@function

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__ashrdi3:

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	andicc.p	gr10,#63,gr10,icc0

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	setlos		#32,gr5

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	andicc.p	gr10,#32,gr0,icc1

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	beqlr		icc0,#0

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	setlos.p	#31,gr6

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	ckeq		icc1,cc4			; cc4 is true if 0<N<32

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	# deal with a shift in the range 1<=N<=31

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	csrl.p		gr9,gr10,gr9	,cc4,#1		; LSW >>= N

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	csub		gr5,gr10,gr5	,cc4,#1		; M = 32 - N

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	csll.p		gr8,gr5,gr4	,cc4,#1

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	csra		gr8,gr10,gr8	,cc4,#1		; MSW >>= N

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	cor.p		gr4,gr9,gr9	,cc4,#1		; LSW |= MSW << M

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	# deal with a shift in the range 32<=N<=63

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	csra		gr8,gr10,gr9	,cc4,#0		; LSW = MSW >> (N & 31 [implicit AND])

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	csra.p		gr8,gr6,gr8	,cc4,#0		; MSW >>= 31

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	bralr

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	.size		__ashrdi3, .-__ashrdi3

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