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Annotation of OpenXM_contrib/gmp/mpn/powerpc32/README, Revision 1.1.1.1

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:
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