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Build by default with optimization level -O2 for GCC

2018-05-25, Andrey Skvortsov

a66062a205ae

Build by default with optimization level -O2 for GCC

before -O0 was used by default, that caused pretty bad performance.

Amd64, i6700k, 4200MHz, GNU/Linux (non-RT kernel), gcc 7.2.0

-------------------------------------
Optimization | EN/ENO |no EN/ENO |
-------------------------------------
default | 11 | 9.5 |
-O3 | 3.9 | 5.2 |
-O2 | 4 | 4.8 |
-Os | 4.1 | 3.5 |
-Ofast | 3.9 | 5.2 |
-------------------------------------

ARM, BBB Cortex-A8, 600Mhz, GNU/Linux, gcc 4.6.3

-------------------------------------
Optimization | EN/ENO |no EN/ENO |
-------------------------------------
default | 273 | 226 |
-O3 | 141.8 | 106.2 |
-O2 | 142 | 107 |
-Os | 152.5 | 112.2 |
-Ofast | 141.7 | 106.2 |
-------------------------------------

For embedded systems with size constaints (like Cortex-Mx, AVR and so
on) I usually use -Os. It gets pretty good results. For
GNU/Linux-based systems -O2 is usually a good choice, as you see the
test results.

#!/usr/bin/env python

# -*- coding: utf-8 -*-

# This file is part of Beremiz, a Integrated Development Environment for

# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.

# See COPYING file for copyrights details.

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; either version 2

# of the License, or (at your option) any later version.

# This program 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 General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

from __future__ import absolute_import

import os

from POULibrary import POULibrary

from py_ext.PythonFileCTNMixin import PythonFileCTNMixin

import util.paths as paths

class PythonLibrary(POULibrary):

def GetLibraryPath(self):

return paths.AbsNeighbourFile(__file__, "pous.xml")

def Generate_C(self, buildpath, varlist, IECCFLAGS):

plc_python_filepath = paths.AbsNeighbourFile(__file__, "plc_python.c")

plc_python_file = open(plc_python_filepath, 'r')

plc_python_code = plc_python_file.read()

plc_python_file.close()

python_eval_fb_list = []

for v in varlist:

if v["vartype"] == "FB" and v["type"] in ["PYTHON_EVAL",

"PYTHON_POLL"]:

python_eval_fb_list.append(v)

python_eval_fb_count = max(1, len(python_eval_fb_list))

# prepare python code

plc_python_code = plc_python_code % {

"python_eval_fb_count": python_eval_fb_count}

Gen_Pythonfile_path = os.path.join(buildpath, "py_ext.c")

pythonfile = open(Gen_Pythonfile_path, 'w')

pythonfile.write(plc_python_code)

pythonfile.close()

return (["py_ext"], [(Gen_Pythonfile_path, IECCFLAGS)], True), ""

class PythonFile(PythonFileCTNMixin):

def GetIconName(self):

return "Pyfile"

beremiz