60 lines
1.8 KiB
ArmAsm
60 lines
1.8 KiB
ArmAsm
# IBM POWER __mpn_lshift --
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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 Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 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 Lesser General Public
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# License for more details.
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# You should have received a copy of the GNU Lesser 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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# the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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# MA 02111-1307, USA.
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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_lshift[DS]
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.extern .__mpn_lshift
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.csect [PR]
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.align 2
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.globl __mpn_lshift
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.globl .__mpn_lshift
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.csect __mpn_lshift[DS]
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__mpn_lshift:
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.long .__mpn_lshift, TOC[tc0], 0
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.csect [PR]
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.__mpn_lshift:
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sli 0,5,2
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cax 9,3,0
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cax 4,4,0
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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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lu 0,-4(4) # read most significant limb
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sre 3,0,8 # compute carry out 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 most significant limb
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sreq 7,0,8 # compute most 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 lower limb
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stu 7,-4(9) # store previous result during read latency
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sreq 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 least significant limb
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Lend2: sle 7,0,6 # compute least significant limb
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st 7,-4(9) # store it" \
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br
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