| Copyright 2002, 2005 Free Software Foundation, Inc. |
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| 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/. |
| |
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| 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 |
