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Annotation of OpenXM_contrib/gmp/mpn/powerpc32/README, Revision 1.1

1.1     ! ohara       1: Copyright 2002 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:                     POWERPC 32-BIT MPN SUBROUTINES
        !            25:
        !            26:
        !            27: This directory contains mpn functions for various 32-bit PowerPC chips.
        !            28:
        !            29:
        !            30: CODE ORGANIZATION
        !            31:
        !            32:        powerpc           generic, 604, 604e
        !            33:        powerpc/750       740, 750, 7400
        !            34:
        !            35:
        !            36: The top-level powerpc directory is currently mostly aimed at 604/604e but
        !            37: should be reasonable on all powerpcs.
        !            38:
        !            39:
        !            40:
        !            41: STATUS
        !            42:
        !            43: The code is quite well optimized for the 604e, other chips have had less
        !            44: attention.
        !            45:
        !            46: Altivec SIMD available in 7400 might hold some promise, but unfortunately
        !            47: GMP only guarantees 32-bit data alignment, so there's lots of fiddling
        !            48: around with partial operations at the start and end of limb vectors.  A
        !            49: 128-bit limb would be a novel idea, but is unlikely to be practical, since
        !            50: it would have to work with ordinary +, -, * etc in the C code.
        !            51:
        !            52:
        !            53:
        !            54: REGISTER NAMES
        !            55:
        !            56: The normal powerpc convention is to give registers as plain numbers, like
        !            57: "mtctr 6", but on Apple MacOS X (powerpc*-*-rhapsody* and
        !            58: powerpc*-*-darwin*) the assembler demands an "r" like "mtctr r6".  Note
        !            59: however when register 0 in an instruction means a literal zero the "r" is
        !            60: omitted, for instance "lwzx r6,0,r7".
        !            61:
        !            62: The GMP code uses the "r" forms, powerpc-defs.m4 transforms them to plain
        !            63: numbers according to what GMP_ASM_POWERPC_R_REGISTERS finds is needed.
        !            64:
        !            65:
        !            66:
        !            67:
        !            68: REFERENCES
        !            69:
        !            70: PowerPC Microprocessor Family: The Programming Environments for 32-bit
        !            71: Microprocessors, IBM document G522-0290-01, 2000.
        !            72:
        !            73: PowerPC 604e RISC Microprocessor User's Manual with Supplement for PowerPC
        !            74: 604 Microprocessor, IBM document G552-0330-00, Motorola document
        !            75: MPC604EUM/AD, 1998.
        !            76:
        !            77: MPC7400 RISC Microprocessor User's Manual, Motorola document MPC7400UM/D,
        !            78: rev 0, 3/2000.
        !            79:
        !            80: The above are available online from
        !            81:
        !            82:        http://chips.ibm.com/techlib/products/powerpc/manuals
        !            83:        http://www.mot.com/PowerPC
        !            84:
        !            85:
        !            86:
        !            87: ----------------
        !            88: Local variables:
        !            89: mode: text
        !            90: fill-column: 76
        !            91: End: