1995-10-16 01:18:40 +00:00
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# IBM POWER __mpn_rshift --
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# Copyright (C) 1992, 1994 Free Software Foundation, Inc.
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# This file is part of the GNU MP Library.
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# The GNU MP Library is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Library General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or (at your
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# option) any later version.
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# The GNU MP Library is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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# License for more details.
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# You should have received a copy of the GNU Library General Public License
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# along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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1996-05-07 21:04:45 +00:00
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# the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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# MA 02111-1307, USA.
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1995-10-16 01:18:40 +00:00
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# INPUT PARAMETERS
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# res_ptr r3
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# s_ptr r4
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# size r5
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# cnt r6
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.toc
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.extern __mpn_rshift[DS]
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.extern .__mpn_rshift
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.csect [PR]
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.align 2
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.globl __mpn_rshift
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.globl .__mpn_rshift
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.csect __mpn_rshift[DS]
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__mpn_rshift:
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.long .__mpn_rshift, TOC[tc0], 0
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.csect [PR]
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.__mpn_rshift:
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sfi 8,6,32
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mtctr 5 # put limb count in CTR loop register
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l 0,0(4) # read least significant limb
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ai 9,3,-4 # adjust res_ptr since it's offset in the stu:s
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sle 3,0,8 # compute carry limb, and init MQ register
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bdz Lend2 # if just one limb, skip loop
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lu 0,4(4) # read 2:nd least significant limb
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sleq 7,0,8 # compute least significant limb of result
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bdz Lend # if just two limb, skip loop
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Loop: lu 0,4(4) # load next higher limb
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stu 7,4(9) # store previous result during read latency
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sleq 7,0,8 # compute result limb
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bdn Loop # loop back until CTR is zero
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Lend: stu 7,4(9) # store 2:nd most significant limb
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Lend2: sre 7,0,6 # compute most significant limb
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st 7,4(9) # store it" \
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br
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