github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/pa32/hppa1_1/pa7100/rshift.asm (about)

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