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Diffstat (limited to 'sysdeps/rs6000/rshift.s')
| -rw-r--r-- | sysdeps/rs6000/rshift.s | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/sysdeps/rs6000/rshift.s b/sysdeps/rs6000/rshift.s new file mode 100644 index 0000000000..145218fabd --- /dev/null +++ b/sysdeps/rs6000/rshift.s @@ -0,0 +1,57 @@ +# IBM POWER __mpn_rshift -- + +# 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 Lesser General Public License as published by +# the Free Software Foundation; either version 2.1 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 Lesser General Public +# License for more details. + +# You should have received a copy of the GNU Lesser General Public License +# along with the GNU MP Library; see the file COPYING.LIB. If not, write to +# the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, +# MA 02111-1307, USA. + + +# INPUT PARAMETERS +# res_ptr r3 +# s_ptr r4 +# size r5 +# cnt r6 + + .toc + .extern __mpn_rshift[DS] + .extern .__mpn_rshift +.csect [PR] + .align 2 + .globl __mpn_rshift + .globl .__mpn_rshift + .csect __mpn_rshift[DS] +__mpn_rshift: + .long .__mpn_rshift, TOC[tc0], 0 + .csect [PR] +.__mpn_rshift: + sfi 8,6,32 + mtctr 5 # put limb count in CTR loop register + l 0,0(4) # read least significant limb + ai 9,3,-4 # adjust res_ptr since it's offset in the stu:s + sle 3,0,8 # compute carry limb, and init MQ register + bdz Lend2 # if just one limb, skip loop + lu 0,4(4) # read 2:nd least significant limb + sleq 7,0,8 # compute least significant limb of result + bdz Lend # if just two limb, skip loop +Loop: lu 0,4(4) # load next higher limb + stu 7,4(9) # store previous result during read latency + sleq 7,0,8 # compute result limb + bdn Loop # loop back until CTR is zero +Lend: stu 7,4(9) # store 2:nd most significant limb +Lend2: sre 7,0,6 # compute most significant limb + st 7,4(9) # store it" \ + br |