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git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1431 0778d3d1-df1d-0410-868b-ea421aaaa00d
111 lines
2.2 KiB
C
111 lines
2.2 KiB
C
/*
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* lmms_math.h - defines math functions
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*
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* Copyright (c) 2004-2008 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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*
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* This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef _LMMS_MATH_H
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#define _LMMS_MATH_H
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#ifdef __INTEL_COMPILER
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#include <math.h>
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static inline float absFraction( const float _x )
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{
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return( _x - ( _x >= 0.0f ? floorf( _x ) : floorf( _x ) - 1 ) );
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}
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static inline float fraction( const float _x )
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{
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return( _x - floorf( _x ) );
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}
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#else
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static inline float absFraction( const float _x )
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{
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return( _x - ( _x >= 0.0f ? static_cast<int>( _x ) :
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static_cast<int>( _x ) - 1 ) );
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}
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static inline float fraction( const float _x )
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{
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return( _x - static_cast<int>( _x ) );
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}
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#if 0
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// SSE3-version
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static inline float absFraction( float _x )
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{
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unsigned int tmp;
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asm(
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"fld %%st\n\t"
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"fisttp %1\n\t"
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"fild %1\n\t"
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"ftst\n\t"
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"sahf\n\t"
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"jae 1f\n\t"
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"fld1\n\t"
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"fsubrp %%st, %%st(1)\n\t"
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"1:\n\t"
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"fsubrp %%st, %%st(1)"
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: "+t"( _x ), "=m"( tmp )
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:
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: "st(1)", "cc" );
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return( _x );
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}
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static inline float absFraction( float _x )
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{
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unsigned int tmp;
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asm(
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"fld %%st\n\t"
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"fisttp %1\n\t"
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"fild %1\n\t"
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"fsubrp %%st, %%st(1)"
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: "+t"( _x ), "=m"( tmp )
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:
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: "st(1)" );
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return( _x );
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}
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#endif
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#endif
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#define FAST_RAND_MAX 32767
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static inline int fast_rand( void )
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{
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static unsigned long next = 1;
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next = next * 1103515245 + 12345;
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return( (unsigned)( next / 65536 ) % 32768 );
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}
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#endif
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