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<a href="#define-members">Macros</a> |
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<div class="title">SDL_cpuinfo.h File Reference</div> </div>
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<div class="textblock"><code>#include "<a class="el" href="SDL__stdinc_8h_source.html">SDL_stdinc.h</a>"</code><br />
<code>#include "<a class="el" href="begin__code_8h_source.html">begin_code.h</a>"</code><br />
<code>#include "<a class="el" href="close__code_8h_source.html">close_code.h</a>"</code><br />
</div>
<p><a href="SDL__cpuinfo_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:a05d74b2aab28d821ea7f3f78372fd00e"><td class="memItemLeft" align="right" valign="top"><a id="a05d74b2aab28d821ea7f3f78372fd00e"></a>
#define </td><td class="memItemRight" valign="bottom"><b>SDL_CACHELINE_SIZE</b>   128</td></tr>
<tr class="separator:a05d74b2aab28d821ea7f3f78372fd00e"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:a888cf77e53a67803402e1740a9639bd7"><td class="memItemLeft" align="right" valign="top">DECLSPEC int SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#a888cf77e53a67803402e1740a9639bd7">SDL_GetCPUCount</a> (void)</td></tr>
<tr class="separator:a888cf77e53a67803402e1740a9639bd7"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa699924d6c33d2cac8f1983c4ae4091c"><td class="memItemLeft" align="right" valign="top">DECLSPEC int SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#aa699924d6c33d2cac8f1983c4ae4091c">SDL_GetCPUCacheLineSize</a> (void)</td></tr>
<tr class="separator:aa699924d6c33d2cac8f1983c4ae4091c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:afea666a39b6be7821303adcf16e83c47"><td class="memItemLeft" align="right" valign="top">DECLSPEC SDL_bool SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#afea666a39b6be7821303adcf16e83c47">SDL_HasRDTSC</a> (void)</td></tr>
<tr class="separator:afea666a39b6be7821303adcf16e83c47"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9bc2024dc37b1d318eb197c161f8e50b"><td class="memItemLeft" align="right" valign="top">DECLSPEC SDL_bool SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#a9bc2024dc37b1d318eb197c161f8e50b">SDL_HasAltiVec</a> (void)</td></tr>
<tr class="separator:a9bc2024dc37b1d318eb197c161f8e50b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aecec2f1434aa2eb5c82f974880f5181f"><td class="memItemLeft" align="right" valign="top">DECLSPEC SDL_bool SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#aecec2f1434aa2eb5c82f974880f5181f">SDL_HasMMX</a> (void)</td></tr>
<tr class="separator:aecec2f1434aa2eb5c82f974880f5181f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a57efd279a93553cf43a54e3a49db6305"><td class="memItemLeft" align="right" valign="top">DECLSPEC SDL_bool SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#a57efd279a93553cf43a54e3a49db6305">SDL_Has3DNow</a> (void)</td></tr>
<tr class="separator:a57efd279a93553cf43a54e3a49db6305"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aed4b71a601e3a12786a5280f59c0e26d"><td class="memItemLeft" align="right" valign="top">DECLSPEC SDL_bool SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#aed4b71a601e3a12786a5280f59c0e26d">SDL_HasSSE</a> (void)</td></tr>
<tr class="separator:aed4b71a601e3a12786a5280f59c0e26d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aadc66ce3d29c669f6c78ee17c592336e"><td class="memItemLeft" align="right" valign="top">DECLSPEC SDL_bool SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#aadc66ce3d29c669f6c78ee17c592336e">SDL_HasSSE2</a> (void)</td></tr>
<tr class="separator:aadc66ce3d29c669f6c78ee17c592336e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab0dfbc5d529ba0b65d1fff744da69f5e"><td class="memItemLeft" align="right" valign="top">DECLSPEC SDL_bool SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#ab0dfbc5d529ba0b65d1fff744da69f5e">SDL_HasSSE3</a> (void)</td></tr>
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<tr class="memitem:a6719853bee3dd03b8823540705a55932"><td class="memItemLeft" align="right" valign="top">DECLSPEC SDL_bool SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#a6719853bee3dd03b8823540705a55932">SDL_HasSSE41</a> (void)</td></tr>
<tr class="separator:a6719853bee3dd03b8823540705a55932"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9fea35e1593bb7981cdc1da4d0b2dccb"><td class="memItemLeft" align="right" valign="top">DECLSPEC SDL_bool SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#a9fea35e1593bb7981cdc1da4d0b2dccb">SDL_HasSSE42</a> (void)</td></tr>
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<tr class="memitem:aec739a6c622987314d9a22899c4ba673"><td class="memItemLeft" align="right" valign="top">DECLSPEC SDL_bool SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#aec739a6c622987314d9a22899c4ba673">SDL_HasAVX</a> (void)</td></tr>
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<tr class="memitem:a1fa7d982a27fb5a29fc1b291fc1054f4"><td class="memItemLeft" align="right" valign="top">DECLSPEC SDL_bool SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#a1fa7d982a27fb5a29fc1b291fc1054f4">SDL_HasAVX2</a> (void)</td></tr>
<tr class="separator:a1fa7d982a27fb5a29fc1b291fc1054f4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5108ee8d59a6d8a0a978f96b799bd3b1"><td class="memItemLeft" align="right" valign="top">DECLSPEC SDL_bool SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#a5108ee8d59a6d8a0a978f96b799bd3b1">SDL_HasAVX512F</a> (void)</td></tr>
<tr class="separator:a5108ee8d59a6d8a0a978f96b799bd3b1"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ac5096ea77af07eb4a9d4c754289b2a2b"><td class="memItemLeft" align="right" valign="top">DECLSPEC SDL_bool SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#ac5096ea77af07eb4a9d4c754289b2a2b">SDL_HasNEON</a> (void)</td></tr>
<tr class="separator:ac5096ea77af07eb4a9d4c754289b2a2b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af672834675f296bed0e226113695bebd"><td class="memItemLeft" align="right" valign="top">DECLSPEC int SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#af672834675f296bed0e226113695bebd">SDL_GetSystemRAM</a> (void)</td></tr>
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<tr class="memitem:a99cf6527faa408c398a5a678aaf892d5"><td class="memItemLeft" align="right" valign="top">DECLSPEC size_t SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#a99cf6527faa408c398a5a678aaf892d5">SDL_SIMDGetAlignment</a> (void)</td></tr>
<tr class="memdesc:a99cf6527faa408c398a5a678aaf892d5"><td class="mdescLeft"> </td><td class="mdescRight">Report the alignment this system needs for SIMD allocations. <a href="#a99cf6527faa408c398a5a678aaf892d5">More...</a><br /></td></tr>
<tr class="separator:a99cf6527faa408c398a5a678aaf892d5"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a90747fee878a98aaba20e615f749308b"><td class="memItemLeft" align="right" valign="top">DECLSPEC void *SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#a90747fee878a98aaba20e615f749308b">SDL_SIMDAlloc</a> (const size_t len)</td></tr>
<tr class="memdesc:a90747fee878a98aaba20e615f749308b"><td class="mdescLeft"> </td><td class="mdescRight">Allocate memory in a SIMD-friendly way. <a href="#a90747fee878a98aaba20e615f749308b">More...</a><br /></td></tr>
<tr class="separator:a90747fee878a98aaba20e615f749308b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5bd4b538ff298ee8f2c31ed9da3253d4"><td class="memItemLeft" align="right" valign="top">DECLSPEC void SDLCALL </td><td class="memItemRight" valign="bottom"><a class="el" href="SDL__cpuinfo_8h.html#a5bd4b538ff298ee8f2c31ed9da3253d4">SDL_SIMDFree</a> (void *ptr)</td></tr>
<tr class="memdesc:a5bd4b538ff298ee8f2c31ed9da3253d4"><td class="mdescLeft"> </td><td class="mdescRight">Deallocate memory obtained from SDL_SIMDAlloc. <a href="#a5bd4b538ff298ee8f2c31ed9da3253d4">More...</a><br /></td></tr>
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</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>CPU feature detection for SDL. </p>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="aa699924d6c33d2cac8f1983c4ae4091c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa699924d6c33d2cac8f1983c4ae4091c">◆ </a></span>SDL_GetCPUCacheLineSize()</h2>
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<td class="memname">DECLSPEC int SDLCALL SDL_GetCPUCacheLineSize </td>
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<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>This function returns the L1 cache line size of the CPU</p>
<p>This is useful for determining multi-threaded structure padding or SIMD prefetch sizes. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a888cf77e53a67803402e1740a9639bd7">◆ </a></span>SDL_GetCPUCount()</h2>
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<td class="memname">DECLSPEC int SDLCALL SDL_GetCPUCount </td>
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<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>This function returns the number of CPU cores available. </p>
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<a id="af672834675f296bed0e226113695bebd"></a>
<h2 class="memtitle"><span class="permalink"><a href="#af672834675f296bed0e226113695bebd">◆ </a></span>SDL_GetSystemRAM()</h2>
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<td class="memname">DECLSPEC int SDLCALL SDL_GetSystemRAM </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>This function returns the amount of RAM configured in the system, in MB. </p>
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<a id="a57efd279a93553cf43a54e3a49db6305"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a57efd279a93553cf43a54e3a49db6305">◆ </a></span>SDL_Has3DNow()</h2>
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<td class="memname">DECLSPEC SDL_bool SDLCALL SDL_Has3DNow </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>This function returns true if the CPU has 3DNow! features. </p>
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<a id="a9bc2024dc37b1d318eb197c161f8e50b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a9bc2024dc37b1d318eb197c161f8e50b">◆ </a></span>SDL_HasAltiVec()</h2>
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<td class="memname">DECLSPEC SDL_bool SDLCALL SDL_HasAltiVec </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>This function returns true if the CPU has AltiVec features. </p>
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<a id="aec739a6c622987314d9a22899c4ba673"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aec739a6c622987314d9a22899c4ba673">◆ </a></span>SDL_HasAVX()</h2>
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<td class="memname">DECLSPEC SDL_bool SDLCALL SDL_HasAVX </td>
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<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>This function returns true if the CPU has AVX features. </p>
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<a id="a1fa7d982a27fb5a29fc1b291fc1054f4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a1fa7d982a27fb5a29fc1b291fc1054f4">◆ </a></span>SDL_HasAVX2()</h2>
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<td class="memname">DECLSPEC SDL_bool SDLCALL SDL_HasAVX2 </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>This function returns true if the CPU has AVX2 features. </p>
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<a id="a5108ee8d59a6d8a0a978f96b799bd3b1"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a5108ee8d59a6d8a0a978f96b799bd3b1">◆ </a></span>SDL_HasAVX512F()</h2>
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<td class="memname">DECLSPEC SDL_bool SDLCALL SDL_HasAVX512F </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>This function returns true if the CPU has AVX-512F (foundation) features. </p>
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<a id="aecec2f1434aa2eb5c82f974880f5181f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aecec2f1434aa2eb5c82f974880f5181f">◆ </a></span>SDL_HasMMX()</h2>
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<td class="memname">DECLSPEC SDL_bool SDLCALL SDL_HasMMX </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>This function returns true if the CPU has MMX features. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac5096ea77af07eb4a9d4c754289b2a2b">◆ </a></span>SDL_HasNEON()</h2>
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<td class="memname">DECLSPEC SDL_bool SDLCALL SDL_HasNEON </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>This function returns true if the CPU has NEON (ARM SIMD) features. </p>
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<a id="afea666a39b6be7821303adcf16e83c47"></a>
<h2 class="memtitle"><span class="permalink"><a href="#afea666a39b6be7821303adcf16e83c47">◆ </a></span>SDL_HasRDTSC()</h2>
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<td class="memname">DECLSPEC SDL_bool SDLCALL SDL_HasRDTSC </td>
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<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>This function returns true if the CPU has the RDTSC instruction. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#aed4b71a601e3a12786a5280f59c0e26d">◆ </a></span>SDL_HasSSE()</h2>
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<td class="memname">DECLSPEC SDL_bool SDLCALL SDL_HasSSE </td>
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<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>This function returns true if the CPU has SSE features. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#aadc66ce3d29c669f6c78ee17c592336e">◆ </a></span>SDL_HasSSE2()</h2>
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<td class="memname">DECLSPEC SDL_bool SDLCALL SDL_HasSSE2 </td>
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<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>This function returns true if the CPU has SSE2 features. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ab0dfbc5d529ba0b65d1fff744da69f5e">◆ </a></span>SDL_HasSSE3()</h2>
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<td class="memname">DECLSPEC SDL_bool SDLCALL SDL_HasSSE3 </td>
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<p>This function returns true if the CPU has SSE3 features. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a6719853bee3dd03b8823540705a55932">◆ </a></span>SDL_HasSSE41()</h2>
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<td class="memname">DECLSPEC SDL_bool SDLCALL SDL_HasSSE41 </td>
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<p>This function returns true if the CPU has SSE4.1 features. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a9fea35e1593bb7981cdc1da4d0b2dccb">◆ </a></span>SDL_HasSSE42()</h2>
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<td class="memname">DECLSPEC SDL_bool SDLCALL SDL_HasSSE42 </td>
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<p>This function returns true if the CPU has SSE4.2 features. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a90747fee878a98aaba20e615f749308b">◆ </a></span>SDL_SIMDAlloc()</h2>
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<td class="memname">DECLSPEC void* SDLCALL SDL_SIMDAlloc </td>
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<p>Allocate memory in a SIMD-friendly way. </p>
<p>This will allocate a block of memory that is suitable for use with SIMD instructions. Specifically, it will be properly aligned and padded for the system's supported vector instructions.</p>
<p>The memory returned will be padded such that it is safe to read or write an incomplete vector at the end of the memory block. This can be useful so you don't have to drop back to a scalar fallback at the end of your SIMD processing loop to deal with the final elements without overflowing the allocated buffer.</p>
<p>You must free this memory with SDL_FreeSIMD(), not free() or SDL_free() or delete[], etc.</p>
<p>Note that SDL will only deal with SIMD instruction sets it is aware of; for example, SDL 2.0.8 knows that SSE wants 16-byte vectors (<a class="el" href="SDL__cpuinfo_8h.html#aed4b71a601e3a12786a5280f59c0e26d">SDL_HasSSE()</a>), and AVX2 wants 32 bytes (<a class="el" href="SDL__cpuinfo_8h.html#a1fa7d982a27fb5a29fc1b291fc1054f4">SDL_HasAVX2()</a>), but doesn't know that AVX-512 wants 64. To be clear: if you can't decide to use an instruction set with an SDL_Has*() function, don't use that instruction set with memory allocated through here.</p>
<p>SDL_AllocSIMD(0) will return a non-NULL pointer, assuming the system isn't out of memory.</p>
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<dl class="section return"><dt>Returns</dt><dd>Pointer to newly-allocated block, NULL if out of memory.</dd></dl>
<dl class="section see"><dt>See also</dt><dd>SDL_SIMDAlignment </dd>
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<a class="el" href="SDL__cpuinfo_8h.html#a5bd4b538ff298ee8f2c31ed9da3253d4" title="Deallocate memory obtained from SDL_SIMDAlloc.">SDL_SIMDFree</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a5bd4b538ff298ee8f2c31ed9da3253d4">◆ </a></span>SDL_SIMDFree()</h2>
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<td class="memname">DECLSPEC void SDLCALL SDL_SIMDFree </td>
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<p>Deallocate memory obtained from SDL_SIMDAlloc. </p>
<p>It is not valid to use this function on a pointer from anything but <a class="el" href="SDL__cpuinfo_8h.html#a90747fee878a98aaba20e615f749308b" title="Allocate memory in a SIMD-friendly way.">SDL_SIMDAlloc()</a>. It can't be used on pointers from malloc, realloc, SDL_malloc, memalign, new[], etc.</p>
<p>However, SDL_SIMDFree(NULL) is a legal no-op.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="SDL__cpuinfo_8h.html#a90747fee878a98aaba20e615f749308b" title="Allocate memory in a SIMD-friendly way.">SDL_SIMDAlloc</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a99cf6527faa408c398a5a678aaf892d5">◆ </a></span>SDL_SIMDGetAlignment()</h2>
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<td class="memname">DECLSPEC size_t SDLCALL SDL_SIMDGetAlignment </td>
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<p>Report the alignment this system needs for SIMD allocations. </p>
<p>This will return the minimum number of bytes to which a pointer must be aligned to be compatible with SIMD instructions on the current machine. For example, if the machine supports SSE only, it will return 16, but if it supports AVX-512F, it'll return 64 (etc). This only reports values for instruction sets SDL knows about, so if your SDL build doesn't have <a class="el" href="SDL__cpuinfo_8h.html#a5108ee8d59a6d8a0a978f96b799bd3b1">SDL_HasAVX512F()</a>, then it might return 16 for the SSE support it sees and not 64 for the AVX-512 instructions that exist but SDL doesn't know about. Plan accordingly. </p>
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