1 Copyright 2002, 2005 Free Software Foundation, Inc.
3 This file is part of the GNU MP Library.
5 The GNU MP Library is free software; you can redistribute it and/or modify
6 it under the terms of either:
8 * the GNU Lesser General Public License as published by the Free
9 Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
14 * the GNU General Public License as published by the Free Software
15 Foundation; either version 2 of the License, or (at your option) any
18 or both in parallel, as here.
20 The GNU MP Library is distributed in the hope that it will be useful, but
21 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
22 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
25 You should have received copies of the GNU General Public License and the
26 GNU Lesser General Public License along with the GNU MP Library. If not,
27 see https://www.gnu.org/licenses/.
33 This directory contains assembly code for nails-enabled 21264. The code is not
36 For addmul_N, as N grows larger, we could make multiple loads together, then do
37 about 3.3 i/c. 10 cycles after the last load, we can increase to 4 i/c. This
38 would surely allow addmul_4 to run at 2 c/l, but the same should be possible
39 also for addmul_3 and perhaps even addmul_2.
43 Routine c/l unroll c/l unroll c/l i/c
44 mul_1 3.25 2.75 2.75 3.273
45 addmul_1 4.0 4 3.5 4 14 3.25 3.385
46 addmul_2 4.0 1 2.5 2 10 2.25 3.333
47 addmul_3 3.0 1 2.33 2 14 2 3.333
48 addmul_4 2.5 1 2.125 2 17 2 3.135
54 (The "best" column doesn't account for bookkeeping instructions and
55 thereby assumes infinite unrolling.)
63 5 addmul_3 + addmul_2 2.3998