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Build by default with optimization level -O2 for GCC

2018-05-25, Andrey Skvortsov

a66062a205ae

Executable

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.

# Package initialisation

"""

Beremiz Targets

- Target are python packages, containing at least one "XSD" file

- Target class may inherit from a toolchain_(toolchainname)

- The target folder's name must match to name define in the XSD for TargetType

"""

from __future__ import absolute_import

from os import listdir, path

import util.paths as paths

_base_path = paths.AbsDir(__file__)

def _GetLocalTargetClassFactory(name):

return lambda: getattr(__import__(name, globals(), locals()), name+"_target")

targets = dict([(name, {"xsd": path.join(_base_path, name, "XSD"),

"class": _GetLocalTargetClassFactory(name),

"code": {fname: path.join(_base_path, name, fname)

for fname in listdir(path.join(_base_path, name))

if (fname.startswith("plc_%s_main" % name) and

fname.endswith(".c"))}})

for name in listdir(_base_path)

if (path.isdir(path.join(_base_path, name)) and

not name.startswith("__"))])

toolchains = {"gcc": path.join(_base_path, "XSD_toolchain_gcc"),

"makefile": path.join(_base_path, "XSD_toolchain_makefile")}

def GetBuilder(targetname):

return targets[targetname]["class"]()

def GetTargetChoices():

DictXSD_toolchain = {}

targetchoices = ""

# Get all xsd toolchains

for toolchainname, xsdfilename in toolchains.iteritems():

if path.isfile(xsdfilename):

DictXSD_toolchain["toolchain_"+toolchainname] = open(xsdfilename).read()

# Get all xsd targets

for _targetname, nfo in targets.iteritems():

xsd_string = open(nfo["xsd"]).read()

targetchoices += xsd_string % DictXSD_toolchain

return targetchoices

def GetTargetCode(targetname):

codedesc = targets[targetname]["code"]

code = "\n".join([open(fpath).read() for _fname, fpath in sorted(codedesc.items())])

return code

def GetHeader():

filename = paths.AbsNeighbourFile(__file__, "beremiz.h")

return open(filename).read()

def GetCode(name):

filename = paths.AbsNeighbourFile(__file__, name)

return open(filename).read()