1dnl HP-PA mpn_rshift -- Shift a number right. 2dnl Optimized for the PA7100, where is runs at 3.25 cycles/limb. 3 4dnl Copyright 1992, 1994, 2000-2003 Free Software Foundation, Inc. 5 6dnl This file is part of the GNU MP Library. 7dnl 8dnl The GNU MP Library is free software; you can redistribute it and/or modify 9dnl it under the terms of either: 10dnl 11dnl * the GNU Lesser General Public License as published by the Free 12dnl Software Foundation; either version 3 of the License, or (at your 13dnl option) any later version. 14dnl 15dnl or 16dnl 17dnl * the GNU General Public License as published by the Free Software 18dnl Foundation; either version 2 of the License, or (at your option) any 19dnl later version. 20dnl 21dnl or both in parallel, as here. 22dnl 23dnl The GNU MP Library is distributed in the hope that it will be useful, but 24dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 25dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 26dnl for more details. 27dnl 28dnl You should have received copies of the GNU General Public License and the 29dnl GNU Lesser General Public License along with the GNU MP Library. If not, 30dnl see https://www.gnu.org/licenses/. 31 32include(`../config.m4') 33 34C INPUT PARAMETERS 35C res_ptr r26 36C s_ptr r25 37C size r24 38C cnt r23 39 40ASM_START() 41PROLOGUE(mpn_rshift) 42 ldws,ma 4(0,%r25),%r22 43 mtsar %r23 44 addib,= -1,%r24,L(0004) 45 vshd %r22,%r0,%r28 C compute carry out limb 46 ldws,ma 4(0,%r25),%r29 47 addib,<= -5,%r24,L(rest) 48 vshd %r29,%r22,%r20 49 50LDEF(loop) 51 ldws,ma 4(0,%r25),%r22 52 stws,ma %r20,4(0,%r26) 53 vshd %r22,%r29,%r20 54 ldws,ma 4(0,%r25),%r29 55 stws,ma %r20,4(0,%r26) 56 vshd %r29,%r22,%r20 57 ldws,ma 4(0,%r25),%r22 58 stws,ma %r20,4(0,%r26) 59 vshd %r22,%r29,%r20 60 ldws,ma 4(0,%r25),%r29 61 stws,ma %r20,4(0,%r26) 62 addib,> -4,%r24,L(loop) 63 vshd %r29,%r22,%r20 64 65LDEF(rest) 66 addib,= 4,%r24,L(end1) 67 nop 68 69LDEF(eloop) 70 ldws,ma 4(0,%r25),%r22 71 stws,ma %r20,4(0,%r26) 72 addib,<= -1,%r24,L(end2) 73 vshd %r22,%r29,%r20 74 ldws,ma 4(0,%r25),%r29 75 stws,ma %r20,4(0,%r26) 76 addib,> -1,%r24,L(eloop) 77 vshd %r29,%r22,%r20 78 79LDEF(end1) 80 stws,ma %r20,4(0,%r26) 81 vshd %r0,%r29,%r20 82 bv 0(%r2) 83 stw %r20,0(0,%r26) 84 85LDEF(end2) 86 stws,ma %r20,4(0,%r26) 87 88LDEF(0004) 89 vshd %r0,%r22,%r20 90 bv 0(%r2) 91 stw %r20,0(0,%r26) 92EPILOGUE() 93