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Annotation of OpenXM_contrib/gmp/mpn/mips64/README, Revision 1.1

1.1     ! ohara       1: Copyright 1996 Free Software Foundation, Inc.
        !             2:
        !             3: This file is part of the GNU MP Library.
        !             4:
        !             5: The GNU MP Library is free software; you can redistribute it and/or modify
        !             6: it under the terms of the GNU Lesser General Public License as published by
        !             7: the Free Software Foundation; either version 2.1 of the License, or (at your
        !             8: option) any later version.
        !             9:
        !            10: The GNU MP Library is distributed in the hope that it will be useful, but
        !            11: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            12: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            13: License for more details.
        !            14:
        !            15: You should have received a copy of the GNU Lesser General Public License
        !            16: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            17: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
        !            18: 02111-1307, USA.
        !            19:
        !            20:
        !            21:
        !            22:
        !            23:
        !            24: This directory contains mpn functions optimized for MIPS3.  Example of
        !            25: processors that implement MIPS3 are R4000, R4400, R4600, R4700, and R8000.
        !            26:
        !            27: RELEVANT OPTIMIZATION ISSUES
        !            28:
        !            29: 1. On the R4000 and R4400, branches, both the plain and the "likely" ones,
        !            30:    take 3 cycles to execute.  (The fastest possible loop will take 4 cycles,
        !            31:    because of the delay insn.)
        !            32:
        !            33:    On the R4600, branches takes a single cycle
        !            34:
        !            35:    On the R8000, branches often take no noticable cycles, as they are
        !            36:    executed in a separate function unit..
        !            37:
        !            38: 2. The R4000 and R4400 have a load latency of 4 cycles.
        !            39:
        !            40: 3. On the R4000 and R4400, multiplies take a data-dependent number of
        !            41:    cycles, contrary to the SGI documentation.  There seem to be 3 or 4
        !            42:    possible latencies.
        !            43:
        !            44: STATUS
        !            45:
        !            46: Good...