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53 lines
1.2 KiB
53 lines
1.2 KiB
17 years ago
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/* MN10300 64-bit logical 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 (dhowells@redhat.com)
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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 __lshrdi3(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 __lshrdi3
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.type __lshrdi3,@function
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__lshrdi3:
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mov (12,sp),a0
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and +63,a0
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beq __lshrdi3_zero
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cmp +31,a0
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bhi __lshrdi3_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_lsr 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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__lshrdi3_32plus:
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lsr a0,d1,d0
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clr d1
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__lshrdi3_zero:
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rets
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.size __lshrdi3, .-__lshrdi3
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