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<h1>csutil/fpu80x86.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> Copyright (C) 1998 by Jorrit Tyberghein</span>
<a name="l00003"></a>00003 <span class="comment"> </span>
<a name="l00004"></a>00004 <span class="comment"> This library is free software; you can redistribute it and/or</span>
<a name="l00005"></a>00005 <span class="comment"> modify it under the terms of the GNU Library General Public</span>
<a name="l00006"></a>00006 <span class="comment"> License as published by the Free Software Foundation; either</span>
<a name="l00007"></a>00007 <span class="comment"> version 2 of the License, or (at your option) any later version.</span>
<a name="l00008"></a>00008 <span class="comment"> </span>
<a name="l00009"></a>00009 <span class="comment"> This library is distributed in the hope that it will be useful,</span>
<a name="l00010"></a>00010 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00011"></a>00011 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00012"></a>00012 <span class="comment"> Library General Public License for more details.</span>
<a name="l00013"></a>00013 <span class="comment"> </span>
<a name="l00014"></a>00014 <span class="comment"> You should have received a copy of the GNU Library General Public</span>
<a name="l00015"></a>00015 <span class="comment"> License along with this library; if not, write to the Free</span>
<a name="l00016"></a>00016 <span class="comment"> Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.</span>
<a name="l00017"></a>00017 <span class="comment">*/</span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="preprocessor">#ifndef __CS_FPU80X86_H__</span>
<a name="l00020"></a>00020 <span class="preprocessor"></span><span class="preprocessor">#define __CS_FPU80X86_H__</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span>
<a name="l00022"></a>00022 <span class="preprocessor">#if defined(CS_PROCESSOR_X86) && defined(CS_COMPILER_GCC)</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span>
<a name="l00024"></a>00024 <span class="comment">/*</span>
<a name="l00025"></a>00025 <span class="comment"> ---- ---- --XX XXXX = MCW_EM - exception masks (1=handle exception internally, 0=fault)</span>
<a name="l00026"></a>00026 <span class="comment"> ---- ---- ---- ---X = EM_INVALID - invalid operation</span>
<a name="l00027"></a>00027 <span class="comment"> ---- ---- ---- --X- = EM_DENORMAL - denormal operand</span>
<a name="l00028"></a>00028 <span class="comment"> ---- ---- ---- -X-- = EM_ZERODIVIDE - divide by zero</span>
<a name="l00029"></a>00029 <span class="comment"> ---- ---- ---- X--- = EM_OVERFLOW - overflow</span>
<a name="l00030"></a>00030 <span class="comment"> ---- ---- ---X ---- = EM_UNDERFLOW - underflow</span>
<a name="l00031"></a>00031 <span class="comment"> ---- ---- --X- ---- = EM_INEXACT - rounding was required</span>
<a name="l00032"></a>00032 <span class="comment"> ---- --XX ---- ---- = MCW_PC - precision control</span>
<a name="l00033"></a>00033 <span class="comment"> ---- --00 ---- ---- = PC_24 - single precision</span>
<a name="l00034"></a>00034 <span class="comment"> ---- --10 ---- ---- = PC_53 - double precision</span>
<a name="l00035"></a>00035 <span class="comment"> ---- --11 ---- ---- = PC_64 - extended precision</span>
<a name="l00036"></a>00036 <span class="comment"> ---- XX-- ---- ---- = MCW_RC - rounding control</span>
<a name="l00037"></a>00037 <span class="comment"> ---- 00-- ---- ---- = RC_NEAR - round to nearest</span>
<a name="l00038"></a>00038 <span class="comment"> ---- 01-- ---- ---- = RC_DOWN - round towards -Inf</span>
<a name="l00039"></a>00039 <span class="comment"> ---- 10-- ---- ---- = RC_UP - round towards +Inf</span>
<a name="l00040"></a>00040 <span class="comment"> ---- 11-- ---- ---- = RC_CHOP - round towards zero</span>
<a name="l00041"></a>00041 <span class="comment"> ---X ---- ---- ---- = MCW_IC - infinity control (obsolete, always affine)</span>
<a name="l00042"></a>00042 <span class="comment"> ---0 ---- ---- ---- = IC_AFFINE - -Inf < +Inf</span>
<a name="l00043"></a>00043 <span class="comment"> ---1 ---- ---- ---- = IC_PROJECTIVE - -Inf == +Inf</span>
<a name="l00044"></a>00044 <span class="comment">*/</span>
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> csControl87(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> newcw, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> mask)
<a name="l00047"></a>00047 {
<a name="l00048"></a>00048 <span class="keywordtype">int</span> oldcw;
<a name="l00049"></a>00049 <span class="keyword">asm</span> __volatile__
<a name="l00050"></a>00050 (
<a name="l00051"></a>00051 <span class="stringliteral">" fclex \n"</span> <span class="comment">// clear exceptions</span>
<a name="l00052"></a>00052 <span class="stringliteral">" fstcw %3 \n"</span> <span class="comment">// oldcw = FPU control word</span>
<a name="l00053"></a>00053 <span class="stringliteral">" andl %3,%%eax \n"</span> <span class="comment">// eax &= oldcw;</span>
<a name="l00054"></a>00054 <span class="stringliteral">" andl %0,%%ecx \n"</span> <span class="comment">// ecx &= newcw</span>
<a name="l00055"></a>00055 <span class="stringliteral">" orl %%ecx,%%eax \n"</span> <span class="comment">// eax |= ecx</span>
<a name="l00056"></a>00056 <span class="stringliteral">" movl %%eax,%3 \n"</span> <span class="comment">// tmpcw = ebx</span>
<a name="l00057"></a>00057 <span class="stringliteral">" fldcw %3 \n"</span> <span class="comment">// load FPU control word</span>
<a name="l00058"></a>00058 :
<a name="l00059"></a>00059 : <span class="stringliteral">"g"</span> (newcw), <span class="stringliteral">"a"</span> (~mask), <span class="stringliteral">"c"</span> (mask), <span class="stringliteral">"m"</span> (oldcw)
<a name="l00060"></a>00060 : <span class="stringliteral">"memory"</span>
<a name="l00061"></a>00061 );
<a name="l00062"></a>00062 <span class="comment">// NOTE: oldcw is modified by the asm. workaround for gcc 3.0</span>
<a name="l00063"></a>00063 <span class="keywordflow">return</span> oldcw & 0xffff;
<a name="l00064"></a>00064 }
<a name="l00065"></a>00065
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="preprocessor">#else</span>
<a name="l00068"></a>00068 <span class="preprocessor"></span>
<a name="l00069"></a>00069 <span class="preprocessor">#if defined(CS_COMPILER_MSVC)</span>
<a name="l00070"></a>00070 <span class="preprocessor"></span><span class="preprocessor">#define csControl87 _control87</span>
<a name="l00071"></a>00071 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00072"></a>00072 <span class="preprocessor"></span><span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> csControl87(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>) { <span class="keywordflow">return</span> 0; }
<a name="l00073"></a>00073 <span class="preprocessor">#endif</span>
<a name="l00074"></a>00074 <span class="preprocessor"></span>
<a name="l00075"></a>00075 <span class="preprocessor">#endif</span>
<a name="l00076"></a>00076 <span class="preprocessor"></span>
<a name="l00077"></a>00077 <span class="preprocessor">#endif // __CS_FPU80X86_H__</span>
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