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Annotation of OpenXM_contrib/gmp/tune/alpha.asm, Revision 1.1.1.2

1.1       maekawa     1: dnl  Alpha time stamp counter access routine.
                      2:
1.1.1.2 ! ohara       3: dnl  Copyright 2000 Free Software Foundation, Inc.
1.1       maekawa     4: dnl
                      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
                      8: dnl  modify it under the terms of the GNU Lesser General Public License as
                      9: dnl  published by the Free Software Foundation; either version 2.1 of the
                     10: dnl  License, or (at your option) any later version.
                     11: dnl
                     12: dnl  The GNU MP Library is distributed in the hope that it will be useful,
                     13: dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
                     14: dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
                     15: dnl  Lesser General Public License for more details.
                     16: dnl
                     17: dnl  You should have received a copy of the GNU Lesser General Public
                     18: dnl  License along with the GNU MP Library; see the file COPYING.LIB.  If
                     19: dnl  not, write to the Free Software Foundation, Inc., 59 Temple Place -
                     20: dnl  Suite 330, Boston, MA 02111-1307, USA.
                     21:
                     22: include(`../config.m4')
                     23:
                     24:
                     25: C void speed_cyclecounter (unsigned int p[2]);
                     26: C
1.1.1.2 ! ohara      27:
        !            28: C The rpcc instruction returns a 64-bit value split into two 32-bit fields.
        !            29: C The lower 32 bits are set by the hardware, and the upper 32 bits are set
        !            30: C by the operating system.  The real per-process cycle count is the sum of
        !            31: C these halves.
        !            32:
        !            33: C Unfortunately, some operating systems don't get this right.  NetBSD 1.3 is
        !            34: C known to sometimes put garbage in the upper half.  Whether newer NetBSD
        !            35: C versions get it right, is unknown to us.
        !            36:
1.1       maekawa    37: C rpcc measures cycles elapsed in the user program and hence should be very
                     38: C accurate even on a busy system.  Losing cache contents due to task
                     39: C switching may have an effect though.
                     40:
                     41: ASM_START()
                     42: PROLOGUE(speed_cyclecounter)
                     43:        rpcc    r0
1.1.1.2 ! ohara      44:        srl     r0,32,r1
        !            45:        addq    r1,r0,r0
1.1       maekawa    46:        stl     r0,0(r16)
1.1.1.2 ! ohara      47:        stl     r31,4(r16)              C zero upper return word
1.1       maekawa    48:        ret     r31,(r26),1
                     49: EPILOGUE(speed_cyclecounter)
                     50: ASM_END()