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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mn10300/lib/__ashrdi3.S
10817 views
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/* MN10300 64-bit arithmetic right shift

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 *

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 * Copyright (C) 2007 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 Licence

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 * as published by the Free Software Foundation; either version

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

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 */

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#include <asm/cache.h>

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        .text

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        .balign	L1_CACHE_BYTES

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

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#

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# unsigned long long __ashrdi3(unsigned long long value [D1:D0],

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#			       unsigned by [(12,SP)])

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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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	mov	(12,sp),a0

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	and	+63,a0

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	beq	__ashrdi3_zero

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	cmp	+31,a0

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	bhi	__ashrdi3_32plus

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	# the count is in the range 1-31

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	lsr	a0,d0

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	mov	+32,a1

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	sub	a0,a1,a1			# a1 = 32 - count

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	asl	a1,d1,a1			# get underflow from MSW -> LSW

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	or_asr	a1,d0,a0,d1			# insert underflow into LSW and

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						# shift the MSW

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	rets

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	.balign	L1_CACHE_BYTES

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	# the count is in the range 32-63

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__ashrdi3_32plus:

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	asr	a0,d1,d0

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	ext	d0				# sign-extend result through MDR

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	mov	mdr,d1

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__ashrdi3_zero:

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	rets

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	.size	__ashrdi3, .-__ashrdi3

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