1/* IBM POWER lshift 2 * 3 * Copyright (C) 1992, 1994, 1999, 2002 Free Software Foundation, Inc. 4 * 5 * This file is part of Libgcrypt. 6 * 7 * Libgcrypt is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU Lesser General Public License as 9 * published by the Free Software Foundation; either version 2.1 of 10 * the License, or (at your option) any later version. 11 * 12 * Libgcrypt is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 20 */ 21 22#include "sysdep.h" 23#include "asm-syntax.h" 24 25/* 26# INPUT PARAMETERS 27# res_ptr r3 28# s_ptr r4 29# size r5 30# cnt r6 31 */ 32 33 .toc 34 .extern _gcry_mpih_lshift[DS] 35 .extern ._gcry_mpih_lshift 36.csect [PR] 37 .align 2 38 .globl _gcry_mpih_lshift 39 .globl ._gcry_mpih_lshift 40 .csect _gcry_mpih_lshift[DS] 41_gcry_mpih_lshift: 42 .long ._gcry_mpih_lshift, TOC[tc0], 0 43 .csect [PR] 44._gcry_mpih_lshift: 45 sli 0,5,2 46 cax 9,3,0 47 cax 4,4,0 48 sfi 8,6,32 49 mtctr 5 # put limb count in CTR loop register 50 lu 0,-4(4) # read most significant limb 51 sre 3,0,8 # compute carry out limb, and init MQ register 52 bdz Lend2 # if just one limb, skip loop 53 lu 0,-4(4) # read 2:nd most significant limb 54 sreq 7,0,8 # compute most significant limb of result 55 bdz Lend # if just two limb, skip loop 56Loop: lu 0,-4(4) # load next lower limb 57 stu 7,-4(9) # store previous result during read latency 58 sreq 7,0,8 # compute result limb 59 bdn Loop # loop back until CTR is zero 60Lend: stu 7,-4(9) # store 2:nd least significant limb 61Lend2: sle 7,0,6 # compute least significant limb 62 st 7,-4(9) # store it 63 br 64 65