github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/tune/powerpc.asm (about)

     1  dnl  PowerPC mftb_function -- read time base registers.
     2  
     3  dnl  Copyright 2002 Free Software Foundation, Inc.
     4  
     5  dnl  This file is part of the GNU MP Library.
     6  dnl
     7  dnl  The GNU MP Library is free software; you can redistribute it and/or modify
     8  dnl  it under the terms of either:
     9  dnl
    10  dnl    * the GNU Lesser General Public License as published by the Free
    11  dnl      Software Foundation; either version 3 of the License, or (at your
    12  dnl      option) any later version.
    13  dnl
    14  dnl  or
    15  dnl
    16  dnl    * the GNU General Public License as published by the Free Software
    17  dnl      Foundation; either version 2 of the License, or (at your option) any
    18  dnl      later version.
    19  dnl
    20  dnl  or both in parallel, as here.
    21  dnl
    22  dnl  The GNU MP Library is distributed in the hope that it will be useful, but
    23  dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    24  dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    25  dnl  for more details.
    26  dnl
    27  dnl  You should have received copies of the GNU General Public License and the
    28  dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
    29  dnl  see https://www.gnu.org/licenses/.
    30  
    31  include(`../config.m4')
    32  
    33  
    34  C void mftb_function (unsigned a[2]);
    35  C
    36  
    37  ASM_START()
    38  PROLOGUE(mftb_function)
    39  
    40  	C r3	a
    41  
    42  L(again):
    43  	mftbu	r4
    44  	mftb	r5
    45  	mftbu	r6
    46  	cmpw	cr0, r4, r6
    47  	bne	L(again)
    48  
    49  	stw	r5, 0(r3)
    50  	stw	r4, 4(r3)
    51  	blr
    52  
    53  EPILOGUE()