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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mn10300/lib/__ucmpdi2.S
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/* __ucmpdi2.S: 64-bit unsigned compare

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 *

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 * Copyright (C) 2008 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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# int __ucmpdi2(unsigned long long a [D0:D1],

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#		unsigned long long b [(SP,12),(SP,16)])

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#

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# - returns 0, 1, or 2 as a <, =, > b respectively.

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#

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

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        .globl		__ucmpdi2

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        .type		__ucmpdi2,@function

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__ucmpdi2:

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	mov		(12,sp),a0		# b.lsw

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	mov		(16,sp),a1		# b.msw

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	sub		a0,d0

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	subc		a1,d1			# may clear Z, never sets it

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	bne		__ucmpdi2_differ	# a.msw != b.msw

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	mov		+1,d0

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	rets

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__ucmpdi2_differ:

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	# C flag is set if LE, clear if GE

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	subc		d0,d0			# -1 if LE, 0 if GE

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	add		+1,d0			#  0 if LE, 1 if GE

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	add		d0,d0			#  0 if LE, 2 if GE

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	rets

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	.size		__ucmpdi2, .-__ucmpdi2

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