You cannot optimize integral division like this. You end up multiplying by 0, 1 or 2 instead of whole spectre of ratios.
(*
* Hedgewars, a free turn based strategy game
* Copyright (c) 2004-2015 Andrey Korotaev <unC0Rr@gmail.com>
*
* 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; version 2 of the License
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*)
{$IFNDEF FPC}
{$ERROR Only FreePascal Compiler is supported!}
{$ENDIF}
{$MACRO ON}
{$MODE OBJFPC}
{$DEFINE GLunit:=GL}
{$WRITEABLECONST OFF}
{$IMPLICITEXCEPTIONS OFF}
{$VARSTRINGCHECKS ON}
{$DEFINE USE_LUA_SCRIPT}
{$IFDEF ANDROID}
{$DEFINE MOBILE}
{$DEFINE USE_CONTEXT_RESTORE}
{$DEFINE Java_Prefix:= 'Java_org_hedgewars_hedgeroid_EngineProtocol_PascalExports_'}
{$ENDIF}
{$IFDEF IPHONEOS}
{$DEFINE MOBILE}
{$ENDIF}
{$IFDEF MOBILE}
{$DEFINE HWLIBRARY}
{$DEFINE GLunit:=gles11}
{$DEFINE USE_LANDSCAPE_AMMOMENU}
{$DEFINE USE_TOUCH_INTERFACE}
{$ELSE}
{$DEFINE USE_AM_NUMCOLUMN}
{$IFNDEF WEBGL}
{$DEFINE USE_S3D_RENDERING}
{$ENDIF}
{$ENDIF}
{$IFDEF WIN32}
{$DEFINE USE_CONTEXT_RESTORE}
{$ENDIF}
{$IFDEF DARWIN}
{$IFNDEF IPHONEOS}
{$DEFINE USE_CONTEXT_RESTORE}
{$ENDIF}
{$ENDIF}
{$DEFINE _S:=}
{$DEFINE _P:=}
//{$DEFINE TRACEAIACTIONS}
//{$DEFINE COUNTTICKS}