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Daan Leijen 2025-01-03 17:56:15 -08:00
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<title>mi-malloc: Aligned Allocation</title>
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<div class="headertitle"><div class="title">Aligned Allocation</div></div>
</div><!--header-->
<div class="contents">
<p>Allocating aligned memory blocks.
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga69578ff1a98ca16e1dcd02c0995cd65c" id="r_ga69578ff1a98ca16e1dcd02c0995cd65c"><td class="memItemLeft" align="right" valign="top">void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ga69578ff1a98ca16e1dcd02c0995cd65c">mi_malloc_aligned</a> (size_t size, size_t alignment)</td></tr>
<tr class="memdesc:ga69578ff1a98ca16e1dcd02c0995cd65c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Allocate <em>size</em> bytes aligned by <em>alignment</em>. <br /></td></tr>
<tr class="memdesc:ga69578ff1a98ca16e1dcd02c0995cd65c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Allocate <em class="arg">size</em> bytes aligned by <em class="arg">alignment</em>. <br /></td></tr>
<tr class="separator:ga69578ff1a98ca16e1dcd02c0995cd65c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gaac7d0beb782f9b9ac31f47492b130f82" id="r_gaac7d0beb782f9b9ac31f47492b130f82"><td class="memItemLeft" align="right" valign="top">void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#gaac7d0beb782f9b9ac31f47492b130f82">mi_zalloc_aligned</a> (size_t size, size_t alignment)</td></tr>
<tr class="separator:gaac7d0beb782f9b9ac31f47492b130f82"><td class="memSeparator" colspan="2">&#160;</td></tr>
@ -122,7 +125,7 @@ Functions</h2></td></tr>
<tr class="memitem:ga5d7a46d054b4d7abe9d8d2474add2edf" id="r_ga5d7a46d054b4d7abe9d8d2474add2edf"><td class="memItemLeft" align="right" valign="top">void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ga5d7a46d054b4d7abe9d8d2474add2edf">mi_realloc_aligned</a> (void *p, size_t newsize, size_t alignment)</td></tr>
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<tr class="memdesc:ga2022f71b95a7cd6cce1b6e07752ae8ca"><td class="mdescLeft">&#160;</td><td class="mdescRight">Allocate <em>size</em> bytes aligned by <em>alignment</em> at a specified <em>offset</em>. <br /></td></tr>
<tr class="memdesc:ga2022f71b95a7cd6cce1b6e07752ae8ca"><td class="mdescLeft">&#160;</td><td class="mdescRight">Allocate <em class="arg">size</em> bytes aligned by <em class="arg">alignment</em> at a specified <em class="arg">offset</em>. <br /></td></tr>
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<tr class="memitem:ga7c1778805ce50ebbf02ccbd5e39d5dba" id="r_ga7c1778805ce50ebbf02ccbd5e39d5dba"><td class="memItemLeft" align="right" valign="top">void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ga7c1778805ce50ebbf02ccbd5e39d5dba">mi_zalloc_aligned_at</a> (size_t size, size_t alignment, size_t offset)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>Allocating aligned memory blocks. Note that <code>alignment</code> always follows <code>size</code> for consistency with the unaligned allocation API, but unfortunately this differs from <code>posix_memalign</code> and <code>aligned_alloc</code> in the C library. </p>
<p>Allocating aligned memory blocks. </p>
<p>Note that <code>alignment</code> always follows <code>size</code> for consistency with the unaligned allocation API, but unfortunately this differs from <code>posix_memalign</code> and <code>aligned_alloc</code> in the C library. </p>
<h2 class="groupheader">Function Documentation</h2>
<a id="ga424ef386fb1f9f8e0a86ab53f16eaaf1" name="ga424ef386fb1f9f8e0a86ab53f16eaaf1"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga424ef386fb1f9f8e0a86ab53f16eaaf1">&#9670;&#160;</a></span>mi_calloc_aligned()</h2>
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</table>
</div><div class="memdoc">
<p>Allocate <em>size</em> bytes aligned by <em>alignment</em>. </p>
<p>Allocate <em class="arg">size</em> bytes aligned by <em class="arg">alignment</em>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">size</td><td>number of bytes to allocate. </td></tr>
<tr><td class="paramname">alignment</td><td>the minimal alignment of the allocated memory. <br />
</td></tr>
<tr><td class="paramname">alignment</td><td>the minimal alignment of the allocated memory. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>pointer to the allocated memory or <em>NULL</em> if out of memory, or if the alignment is not a power of 2 (including 0). The <em>size</em> is unrestricted (and does not have to be an integral multiple of the <em>alignment</em>). The returned pointer is aligned by <em>alignment</em>, i.e. <code>(uintptr_t)p % alignment == 0</code>. Returns a unique pointer if called with <em>size</em> 0.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd>pointer to the allocated memory or <em class="arg">NULL</em> if out of memory, or if the alignment is not a power of 2 (including 0). The <em class="arg">size</em> is unrestricted (and does not have to be an integral multiple of the <em class="arg">alignment</em>). The returned pointer is aligned by <em class="arg">alignment</em>, i.e. <code>(uintptr_t)p % alignment == 0</code>. Returns a unique pointer if called with <em class="arg">size</em> 0.</dd></dl>
<p>Note that <code>alignment</code> always follows <code>size</code> for consistency with the unaligned allocation API, but unfortunately this differs from <code>posix_memalign</code> and <code>aligned_alloc</code> in the C library.</p>
<dl class="section see"><dt>See also</dt><dd><a href="https://en.cppreference.com/w/c/memory/aligned_alloc">aligned_alloc</a> (in the standard C11 library, with switched arguments!) </dd>
<dd>
@ -257,16 +260,16 @@ Functions</h2></td></tr>
</table>
</div><div class="memdoc">
<p>Allocate <em>size</em> bytes aligned by <em>alignment</em> at a specified <em>offset</em>. </p>
<p>Allocate <em class="arg">size</em> bytes aligned by <em class="arg">alignment</em> at a specified <em class="arg">offset</em>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">size</td><td>number of bytes to allocate. </td></tr>
<tr><td class="paramname">alignment</td><td>the minimal alignment of the allocated memory at <em>offset</em>. </td></tr>
<tr><td class="paramname">alignment</td><td>the minimal alignment of the allocated memory at <em class="arg">offset</em>. </td></tr>
<tr><td class="paramname">offset</td><td>the offset that should be aligned. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>pointer to the allocated memory or <em>NULL</em> if out of memory, or if the alignment is not a power of 2 (including 0). The <em>size</em> is unrestricted (and does not have to be an integral multiple of the <em>alignment</em>). The returned pointer is aligned by <em>alignment</em>, i.e. <code>(uintptr_t)p % alignment == 0</code>. Returns a unique pointer if called with <em>size</em> 0.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd>pointer to the allocated memory or <em class="arg">NULL</em> if out of memory, or if the alignment is not a power of 2 (including 0). The <em class="arg">size</em> is unrestricted (and does not have to be an integral multiple of the <em class="arg">alignment</em>). The returned pointer is aligned by <em class="arg">alignment</em>, i.e. <code>(uintptr_t)p % alignment == 0</code>. Returns a unique pointer if called with <em class="arg">size</em> 0.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a href="https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/aligned-offset-malloc?view=vs-2017">_aligned_offset_malloc</a> (on Windows) </dd></dl>
</div>
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