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Diffstat (limited to 'sysdeps/rs6000/lshift.s')
| -rw-r--r-- | sysdeps/rs6000/lshift.s | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/sysdeps/rs6000/lshift.s b/sysdeps/rs6000/lshift.s new file mode 100644 index 0000000000..69c7502061 --- /dev/null +++ b/sysdeps/rs6000/lshift.s @@ -0,0 +1,58 @@ +# IBM POWER __mpn_lshift -- + +# Copyright (C) 1992, 1994 Free Software Foundation, Inc. + +# This file is part of the GNU MP Library. + +# The GNU MP Library is free software; you can redistribute it and/or modify +# it under the terms of the GNU Library General Public License as published by +# the Free Software Foundation; either version 2 of the License, or (at your +# option) any later version. + +# The GNU MP Library is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public +# License for more details. + +# You should have received a copy of the GNU Library General Public License +# along with the GNU MP Library; see the file COPYING.LIB. If not, write to +# the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + +# INPUT PARAMETERS +# res_ptr r3 +# s_ptr r4 +# size r5 +# cnt r6 + + .toc + .extern __mpn_lshift[DS] + .extern .__mpn_lshift +.csect [PR] + .align 2 + .globl __mpn_lshift + .globl .__mpn_lshift + .csect __mpn_lshift[DS] +__mpn_lshift: + .long .__mpn_lshift, TOC[tc0], 0 + .csect [PR] +.__mpn_lshift: + sli 0,5,2 + cax 9,3,0 + cax 4,4,0 + sfi 8,6,32 + mtctr 5 # put limb count in CTR loop register + lu 0,-4(4) # read most significant limb + sre 3,0,8 # compute carry out limb, and init MQ register + bdz Lend2 # if just one limb, skip loop + lu 0,-4(4) # read 2:nd most significant limb + sreq 7,0,8 # compute most significant limb of result + bdz Lend # if just two limb, skip loop +Loop: lu 0,-4(4) # load next lower limb + stu 7,-4(9) # store previous result during read latency + sreq 7,0,8 # compute result limb + bdn Loop # loop back until CTR is zero +Lend: stu 7,-4(9) # store 2:nd least significant limb +Lend2: sle 7,0,6 # compute least significant limb + st 7,-4(9) # store it" \ + br |