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<h1>include/sphinxbase/fixpoint.h</h1> </div>
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<div class="contents">
<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */</span>
<a name="l00002"></a>00002 <span class="comment">/* ====================================================================</span>
<a name="l00003"></a>00003 <span class="comment"> * Copyright (c) 2005 Carnegie Mellon University. All rights </span>
<a name="l00004"></a>00004 <span class="comment"> * reserved.</span>
<a name="l00005"></a>00005 <span class="comment"> *</span>
<a name="l00006"></a>00006 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
<a name="l00007"></a>00007 <span class="comment"> * modification, are permitted provided that the following conditions</span>
<a name="l00008"></a>00008 <span class="comment"> * are met:</span>
<a name="l00009"></a>00009 <span class="comment"> *</span>
<a name="l00010"></a>00010 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
<a name="l00011"></a>00011 <span class="comment"> * notice, this list of conditions and the following disclaimer. </span>
<a name="l00012"></a>00012 <span class="comment"> *</span>
<a name="l00013"></a>00013 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
<a name="l00014"></a>00014 <span class="comment"> * notice, this list of conditions and the following disclaimer in</span>
<a name="l00015"></a>00015 <span class="comment"> * the documentation and/or other materials provided with the</span>
<a name="l00016"></a>00016 <span class="comment"> * distribution.</span>
<a name="l00017"></a>00017 <span class="comment"> *</span>
<a name="l00018"></a>00018 <span class="comment"> * This work was supported in part by funding from the Defense Advanced </span>
<a name="l00019"></a>00019 <span class="comment"> * Research Projects Agency and the National Science Foundation of the </span>
<a name="l00020"></a>00020 <span class="comment"> * United States of America, and the CMU Sphinx Speech Consortium.</span>
<a name="l00021"></a>00021 <span class="comment"> *</span>
<a name="l00022"></a>00022 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND </span>
<a name="l00023"></a>00023 <span class="comment"> * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, </span>
<a name="l00024"></a>00024 <span class="comment"> * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR</span>
<a name="l00025"></a>00025 <span class="comment"> * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY</span>
<a name="l00026"></a>00026 <span class="comment"> * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00027"></a>00027 <span class="comment"> * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT </span>
<a name="l00028"></a>00028 <span class="comment"> * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, </span>
<a name="l00029"></a>00029 <span class="comment"> * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY </span>
<a name="l00030"></a>00030 <span class="comment"> * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT </span>
<a name="l00031"></a>00031 <span class="comment"> * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE </span>
<a name="l00032"></a>00032 <span class="comment"> * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00033"></a>00033 <span class="comment"> *</span>
<a name="l00034"></a>00034 <span class="comment"> * ==================================================================== */</span>
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="comment">/* Fixed-point arithmetic macros.</span>
<a name="l00037"></a>00037 <span class="comment"> *</span>
<a name="l00038"></a>00038 <span class="comment"> * Author: David Huggins-Daines <dhuggins@cs.cmu.edu></span>
<a name="l00039"></a>00039 <span class="comment"> */</span>
<a name="l00040"></a>00040
<a name="l00041"></a>00041 <span class="preprocessor">#ifndef _FIXPOINT_H_</span>
<a name="l00042"></a>00042 <span class="preprocessor"></span><span class="preprocessor">#define _FIXPOINT_H_</span>
<a name="l00043"></a>00043 <span class="preprocessor"></span>
<a name="l00044"></a>00044 <span class="preprocessor">#include <limits.h></span>
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="comment">/* Win32/WinCE DLL gunk */</span>
<a name="l00047"></a>00047 <span class="preprocessor">#include <sphinxbase/sphinxbase_export.h></span>
<a name="l00048"></a>00048 <span class="preprocessor">#include <sphinxbase/prim_type.h></span>
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00051"></a>00051 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {
<a name="l00052"></a>00052 <span class="preprocessor">#endif</span>
<a name="l00053"></a>00053 <span class="preprocessor"></span><span class="preprocessor">#if 0</span>
<a name="l00054"></a>00054 <span class="preprocessor"></span><span class="comment">/* Fool Emacs. */</span>
<a name="l00055"></a>00055 }
<a name="l00056"></a>00056 <span class="preprocessor">#endif</span>
<a name="l00057"></a>00057 <span class="preprocessor"></span>
<a name="l00058"></a>00058 <span class="preprocessor">#ifndef DEFAULT_RADIX</span>
<a name="l00059"></a>00059 <span class="preprocessor"></span><span class="preprocessor">#define DEFAULT_RADIX 12</span>
<a name="l00060"></a>00060 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00061"></a>00061 <span class="preprocessor"></span>
<a name="l00063"></a>00063 <span class="keyword">typedef</span> int32 fixed32;
<a name="l00064"></a>00064
<a name="l00066"></a>00066 <span class="preprocessor">#define FLOAT2FIX_ANY(x,radix) \</span>
<a name="l00067"></a>00067 <span class="preprocessor"> (((x)<0.0) ? \</span>
<a name="l00068"></a>00068 <span class="preprocessor"> ((fixed32)((x)*(float32)(1<<(radix)) - 0.5)) \</span>
<a name="l00069"></a>00069 <span class="preprocessor"> : ((fixed32)((x)*(float32)(1<<(radix)) + 0.5)))</span>
<a name="l00070"></a>00070 <span class="preprocessor"></span><span class="preprocessor">#define FLOAT2FIX(x) FLOAT2FIX_ANY(x,DEFAULT_RADIX)</span>
<a name="l00071"></a>00071 <span class="preprocessor"></span>
<a name="l00072"></a>00072 <span class="preprocessor">#define FIX2FLOAT_ANY(x,radix) ((float32)(x)/(1<<(radix)))</span>
<a name="l00073"></a>00073 <span class="preprocessor"></span><span class="preprocessor">#define FIX2FLOAT(x) FIX2FLOAT_ANY(x,DEFAULT_RADIX)</span>
<a name="l00074"></a>00074 <span class="preprocessor"></span>
<a name="l00083"></a>00083 <span class="comment">/* </span>
<a name="l00084"></a>00084 <span class="comment"> * This works on most modern ARMs but *only* in ARM mode (for obvious</span>
<a name="l00085"></a>00085 <span class="comment"> * reasons), so don't use it in Thumb mode (but why are you building</span>
<a name="l00086"></a>00086 <span class="comment"> * signal processing code in Thumb mode?!)</span>
<a name="l00087"></a>00087 <span class="comment"> */</span>
<a name="l00088"></a>00088 <span class="preprocessor">#if defined(__arm__) && !defined(__thumb__)</span>
<a name="l00089"></a>00089 <span class="preprocessor"></span><span class="preprocessor">#define FIXMUL(a,b) FIXMUL_ANY(a,b,DEFAULT_RADIX)</span>
<a name="l00090"></a>00090 <span class="preprocessor"></span><span class="preprocessor">#define FIXMUL_ANY(a,b,r) ({ \</span>
<a name="l00091"></a>00091 <span class="preprocessor"> int cl, ch, _a = a, _b = b; \</span>
<a name="l00092"></a>00092 <span class="preprocessor"> __asm__ ("smull %0, %1, %2, %3\n" \</span>
<a name="l00093"></a>00093 <span class="preprocessor"> "mov %0, %0, lsr %4\n" \</span>
<a name="l00094"></a>00094 <span class="preprocessor"> "orr %0, %0, %1, lsl %5\n" \</span>
<a name="l00095"></a>00095 <span class="preprocessor"> : "=&r" (cl), "=&r" (ch) \</span>
<a name="l00096"></a>00096 <span class="preprocessor"> : "r" (_a), "r" (_b), "i" (r), "i" (32-(r)));\</span>
<a name="l00097"></a>00097 <span class="preprocessor"> cl; })</span>
<a name="l00098"></a>00098 <span class="preprocessor"></span><span class="preprocessor">#elif defined(BFIN) && DEFAULT_RADIX == 16</span>
<a name="l00099"></a>00099 <span class="preprocessor"></span><span class="comment">/* Blackfin magic */</span>
<a name="l00100"></a>00100 <span class="preprocessor">#undef FIXMUL</span>
<a name="l00101"></a>00101 <span class="preprocessor"></span><span class="comment">/* Use the accumulators for the 16.16 case (probably not as efficient as it could be). */</span>
<a name="l00102"></a>00102 <span class="preprocessor">#define FIXMUL(a,b) ({ \</span>
<a name="l00103"></a>00103 <span class="preprocessor"> int c, _a = a, _b = b; \</span>
<a name="l00104"></a>00104 <span class="preprocessor"> __asm__("%0.L = %1.l * %2.l (FU);\n\t" \</span>
<a name="l00105"></a>00105 <span class="preprocessor"> "%0.H = %1.h * %2.h (IS);\n\t" \</span>
<a name="l00106"></a>00106 <span class="preprocessor"> "A1 = %0;\n\t" \</span>
<a name="l00107"></a>00107 <span class="preprocessor"> "A1 += %1.h * %2.l (IS, M);\n\t" \</span>
<a name="l00108"></a>00108 <span class="preprocessor"> "%0 = (A1 += %2.h * %1.l) (IS, M);\n\t" \</span>
<a name="l00109"></a>00109 <span class="preprocessor"> : "=&W" (c) \</span>
<a name="l00110"></a>00110 <span class="preprocessor"> : "d" (_a), "d" (_b) \</span>
<a name="l00111"></a>00111 <span class="preprocessor"> : "A1", "cc"); \</span>
<a name="l00112"></a>00112 <span class="preprocessor"> c; })</span>
<a name="l00113"></a>00113 <span class="preprocessor"></span><span class="preprocessor">#define FIXMUL_ANY(a,b,radix) ((fixed32)(((int64)(a)*(b))>>(radix)))</span>
<a name="l00114"></a>00114 <span class="preprocessor"></span><span class="preprocessor">#elif defined(_MSC_VER) || (defined(HAVE_LONG_LONG) && SIZEOF_LONG_LONG == 8)</span>
<a name="l00115"></a>00115 <span class="preprocessor"></span><span class="preprocessor">#define FIXMUL(a,b) FIXMUL_ANY(a,b,DEFAULT_RADIX)</span>
<a name="l00116"></a>00116 <span class="preprocessor"></span><span class="preprocessor">#define FIXMUL_ANY(a,b,radix) ((fixed32)(((int64)(a)*(b))>>(radix)))</span>
<a name="l00117"></a>00117 <span class="preprocessor"></span><span class="preprocessor">#else </span><span class="comment">/* Most general case where 'long long' doesn't exist or is slow. */</span>
<a name="l00118"></a>00118 <span class="preprocessor">#define FIXMUL(a,b) FIXMUL_ANY(a,b,DEFAULT_RADIX)</span>
<a name="l00119"></a>00119 <span class="preprocessor"></span><span class="preprocessor">#define FIXMUL_ANY(a,b,radix) \</span>
<a name="l00120"></a>00120 <span class="preprocessor"> (fixed32)(((((uint32)(a))&((1<<(radix))-1)) \</span>
<a name="l00121"></a>00121 <span class="preprocessor"> * (((uint32)(b))&((1<<(radix))-1)) >> (radix)) \</span>
<a name="l00122"></a>00122 <span class="preprocessor"> + (((((int32)(a))>>(radix)) * (((int32)(b))>>(radix))) << (radix)) \</span>
<a name="l00123"></a>00123 <span class="preprocessor"> + ((((uint32)(a))&((1<<(radix))-1)) * (((int32)(b))>>(radix))) \</span>
<a name="l00124"></a>00124 <span class="preprocessor"> + ((((uint32)(b))&((1<<(radix))-1)) * (((int32)(a))>>(radix))))</span>
<a name="l00125"></a>00125 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00126"></a>00126 <span class="preprocessor"></span>
<a name="l00127"></a>00127 <span class="comment">/* Various fixed-point logarithmic functions that we need. */</span>
<a name="l00129"></a>00129 <span class="preprocessor">#define MIN_FIXLOG -2829416 </span><span class="comment">/* log(1e-300) * (1<<DEFAULT_RADIX) */</span>
<a name="l00130"></a>00130 <span class="preprocessor">#define MIN_FIXLOG2 -4081985 </span><span class="comment">/* log2(1e-300) * (1<<DEFAULT_RADIX) */</span>
<a name="l00131"></a>00131
<a name="l00132"></a>00132 <span class="preprocessor">#define FIXLN_2 ((fixed32)(0.693147180559945 * (1<<DEFAULT_RADIX)))</span>
<a name="l00133"></a>00133 <span class="preprocessor"></span>
<a name="l00134"></a>00134 <span class="preprocessor">#define FIXLN(x) (fixlog(x) - (FIXLN_2 * DEFAULT_RADIX))</span>
<a name="l00135"></a>00135 <span class="preprocessor"></span>
<a name="l00139"></a>00139 int32 fixlog(uint32 x);
<a name="l00144"></a>00144 int32 fixlog2(uint32 x);
<a name="l00145"></a>00145
<a name="l00146"></a>00146 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00147"></a>00147 <span class="preprocessor"></span>}
<a name="l00148"></a>00148 <span class="preprocessor">#endif</span>
<a name="l00149"></a>00149 <span class="preprocessor"></span>
<a name="l00150"></a>00150
<a name="l00151"></a>00151 <span class="preprocessor">#endif </span><span class="comment">/* _FIXPOINT_H_ */</span>
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