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Add support for the llvm.memmove intrinsic.

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Patch graciously contributed by Reid Spencer!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11354 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-02-12 18:10:10 +00:00
parent 5ab827ff4a
commit 0eb51b440c
2 changed files with 50 additions and 1 deletions
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47
docs/LangRef.html
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@ -98,6 +98,7 @@
<li><a href="#int_libc">Standard C Library Intrinsics</a>
<ol>
<li><a href="#i_memcpy">'<tt>llvm.memcpy</tt>' Intrinsic</a></li>
<li><a href="#i_memmove">'<tt>llvm.memmove</tt>' Intrinsic</a></li>
</ol>
</li>
<li><a href="#int_debugger">Debugger intrinsics</a>
@ -1790,6 +1791,52 @@ be set to 0 or 1.
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection">
<a name="i_memmove">'<tt>llvm.memmove</tt>' Intrinsic</a>
</div>
<div class="doc_text">
<h5>Syntax:</h5>
<pre>
call void (sbyte*, sbyte*, uint, uint)* %llvm.memmove(sbyte* &lt;dest&gt;, sbyte* &lt;src&gt;,
uint &lt;len&gt;, uint &lt;align&gt;)
</pre>
<h5>Overview:</h5>
<p>
The '<tt>llvm.memmove</tt>' intrinsic moves a block of memory from the source
location to the destination location. It is similar to the '<tt>llvm.memcpy</tt>'
intrinsic but allows the two memory locations to overlap.
</p>
<p>
Note that, unlike the standard libc function, the <tt>llvm.memmove</tt> intrinsic
does not return a value, and takes an extra alignment argument.
</p>
<h5>Arguments:</h5>
<p>
The first argument is a pointer to the destination, the second is a pointer to
the source. The third argument is an (arbitrarily sized) integer argument
specifying the number of bytes to copy, and the fourth argument is the alignment
of the source and destination locations.
</p>
<h5>Semantics:</h5>
<p>
The '<tt>llvm.memmove</tt>' intrinsic copies a block of memory from the source
location to the destination location, which may overlap. It
copies "len" bytes of memory over. If the argument is known to be aligned to
some boundary, this can be specified as the fourth argument, otherwise it should
be set to 0 or 1.
</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection">

4
include/llvm/Intrinsics.h
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@ -45,7 +45,9 @@ namespace Intrinsic {
dbg_declare, // Declare a local object
// Standard libc functions...
memcpy,
memcpy, // Used to copy non-overlapping memory blocks
memmove, // Used to copy overlapping memory blocks
// Standard libm functions...