README
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- Copyright 2002, 2005 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 Lesser General Public License as published by the
- Free Software Foundation; either version 3 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 Lesser General Public License
- for more details.
- You should have received a copy of the GNU Lesser General Public License along
- with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
- This directory contains assembly code for nails-enabled 21264. The code is not
- very well optimized.
- For addmul_N, as N grows larger, we could make multiple loads together, then do
- about 3.3 i/c. 10 cycles after the last load, we can increase to 4 i/c. This
- would surely allow addmul_4 to run at 2 c/l, but the same should be possible
- also for addmul_3 and perhaps even addmul_2.
- current fair best
- Routine c/l unroll c/l unroll c/l i/c
- mul_1 3.25 2.75 2.75 3.273
- addmul_1 4.0 4 3.5 4 14 3.25 3.385
- addmul_2 4.0 1 2.5 2 10 2.25 3.333
- addmul_3 3.0 1 2.33 2 14 2 3.333
- addmul_4 2.5 1 2.125 2 17 2 3.135
- addmul_5 2 1 10
- addmul_6 2 1 12
- addmul_7 2 1 14
- (The "best" column doesn't account for bookkeeping instructions and
- thereby assumes infinite unrolling.)
- Basecase usages:
- 1 addmul_1
- 2 addmul_2
- 3 addmul_3
- 4 addmul_4
- 5 addmul_3 + addmul_2 2.3998
- 6 addmul_4 + addmul_2
- 7 addmul_4 + addmul_3