1dnl IBM POWER mpn_lshift -- Shift a number left. 2 3dnl Copyright 1992, 1994, 1999-2001 Free Software Foundation, Inc. 4 5dnl This file is part of the GNU MP Library. 6dnl 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of either: 9dnl 10dnl * the GNU Lesser General Public License as published by the Free 11dnl Software Foundation; either version 3 of the License, or (at your 12dnl option) any later version. 13dnl 14dnl or 15dnl 16dnl * the GNU General Public License as published by the Free Software 17dnl Foundation; either version 2 of the License, or (at your option) any 18dnl later version. 19dnl 20dnl or both in parallel, as here. 21dnl 22dnl The GNU MP Library is distributed in the hope that it will be useful, but 23dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 24dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 25dnl for more details. 26dnl 27dnl You should have received copies of the GNU General Public License and the 28dnl GNU Lesser General Public License along with the GNU MP Library. If not, 29dnl see https://www.gnu.org/licenses/. 30 31 32dnl INPUT PARAMETERS 33dnl res_ptr r3 34dnl s_ptr r4 35dnl size r5 36dnl cnt r6 37 38include(`../config.m4') 39 40ASM_START() 41PROLOGUE(mpn_lshift) 42 sli 0,5,2 43 cax 9,3,0 44 cax 4,4,0 45 sfi 8,6,32 46 mtctr 5 C put limb count in CTR loop register 47 lu 0,-4(4) C read most significant limb 48 sre 3,0,8 C compute carry out limb, and init MQ register 49 bdz Lend2 C if just one limb, skip loop 50 lu 0,-4(4) C read 2:nd most significant limb 51 sreq 7,0,8 C compute most significant limb of result 52 bdz Lend C if just two limb, skip loop 53Loop: lu 0,-4(4) C load next lower limb 54 stu 7,-4(9) C store previous result during read latency 55 sreq 7,0,8 C compute result limb 56 bdn Loop C loop back until CTR is zero 57Lend: stu 7,-4(9) C store 2:nd least significant limb 58Lend2: sle 7,0,6 C compute least significant limb 59 st 7,-4(9) C store it 60 br 61EPILOGUE(mpn_lshift) 62