1dnl IBM POWER mpn_lshift -- Shift a number left. 2 3dnl Copyright 1992, 1994, 1999, 2000, 2001 Free Software Foundation, Inc. 4 5dnl This file is part of the GNU MP Library. 6 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of the GNU Lesser General Public License as published 9dnl by the Free Software Foundation; either version 3 of the License, or (at 10dnl your option) any later version. 11 12dnl The GNU MP Library is distributed in the hope that it will be useful, but 13dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 15dnl License for more details. 16 17dnl You should have received a copy of the GNU Lesser General Public License 18dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. 19 20 21dnl INPUT PARAMETERS 22dnl res_ptr r3 23dnl s_ptr r4 24dnl size r5 25dnl cnt r6 26 27include(`../config.m4') 28 29ASM_START() 30PROLOGUE(mpn_lshift) 31 sli 0,5,2 32 cax 9,3,0 33 cax 4,4,0 34 sfi 8,6,32 35 mtctr 5 C put limb count in CTR loop register 36 lu 0,-4(4) C read most significant limb 37 sre 3,0,8 C compute carry out limb, and init MQ register 38 bdz Lend2 C if just one limb, skip loop 39 lu 0,-4(4) C read 2:nd most significant limb 40 sreq 7,0,8 C compute most significant limb of result 41 bdz Lend C if just two limb, skip loop 42Loop: lu 0,-4(4) C load next lower limb 43 stu 7,-4(9) C store previous result during read latency 44 sreq 7,0,8 C compute result limb 45 bdn Loop C loop back until CTR is zero 46Lend: stu 7,-4(9) C store 2:nd least significant limb 47Lend2: sle 7,0,6 C compute least significant limb 48 st 7,-4(9) C store it 49 br 50EPILOGUE(mpn_lshift) 51