[project @ 1998-06-05 14:37:58 by simonm]

Import GMP 2.0.2

ghc/rts/gmp/mpn/x86/pentium/README

+This directory contains mpn functions optimized for Intel Pentium
+processors.
+
+RELEVANT OPTIMIZATION ISSUES
+
+1. Pentium doesn't allocate cache lines on writes, unlike most other modern
+processors.  Since the functions in the mpn class do array writes, we have to
+handle allocating the destination cache lines by reading a word from it in the
+loops, to achieve the best performance.
+
+2. Pairing of memory operations requires that the two issued operations refer
+to different cache banks.  The simplest way to insure this is to read/write
+two words from the same object.  If we make operations on different objects,
+they might or might not be to the same cache bank.
+
+STATUS
+
+1. mpn_lshift and mpn_rshift run at about 6 cycles/limb, but the Pentium
+documentation indicates that they should take only 43/8 = 5.375 cycles/limb,
+or 5 cycles/limb asymptotically.
+
+2. mpn_add_n and mpn_sub_n run at asymptotically 2 cycles/limb.  Due to loop
+overhead and other delays (cache refill?), they run at or near 2.5 cycles/limb.
+
+3. mpn_mul_1, mpn_addmul_1, mpn_submul_1 all run 1 cycle faster than they
+should...

ghc/rts/gmp/mpn/z8000/gmp-mparam.h

+/* gmp-mparam.h -- Compiler/machine parameter header file.
+
+Copyright (C) 1991, 1993, 1994 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Library General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at your
+option) any later version.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library General Public License
+along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#define BITS_PER_MP_LIMB 16
+#define BYTES_PER_MP_LIMB 2
+#define BITS_PER_LONGINT 32
+#define BITS_PER_INT 16
+#define BITS_PER_SHORTINT 16
+#define BITS_PER_CHAR 8