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Add llvm.stacksave and llvm.stackrestore.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25264 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -127,6 +127,8 @@
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<ol>
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<li><a href="#i_returnaddress">'<tt>llvm.returnaddress</tt>' Intrinsic</a></li>
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<li><a href="#i_frameaddress">'<tt>llvm.frameaddress</tt>' Intrinsic</a></li>
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<li><a href="#i_stacksave">'<tt>llvm.stacksave</tt>' Intrinsic</a></li>
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<li><a href="#i_stackrestore">'<tt>llvm.stackrestore</tt>' Intrinsic</a></li>
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<li><a href="#i_prefetch">'<tt>llvm.prefetch</tt>' Intrinsic</a></li>
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<li><a href="#i_pcmarker">'<tt>llvm.pcmarker</tt>' Intrinsic</a></li>
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<li><a href="#i_readcyclecounter"><tt>llvm.readcyclecounter</tt>' Intrinsic</a></li>
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@ -2787,6 +2789,72 @@ source-language caller.
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</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="i_stacksave">'<tt>llvm.stacksave</tt>' Intrinsic</a>
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</div>
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<div class="doc_text">
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<h5>Syntax:</h5>
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<pre>
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declare sbyte *%llvm.stacksave()
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</pre>
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<h5>Overview:</h5>
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<p>
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The '<tt>llvm.stacksave</tt>' intrinsic is used to remember the current state of
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the function stack, for use with <a href="#i_stackrestore">
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<tt>llvm.stackrestore</tt></a>. This is useful for implementing language
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features like scoped automatic variable sized arrays in C99.
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</p>
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<h5>Semantics:</h5>
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<p>
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This intrinsic returns a opaque pointer value that can be passed to <a
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href="#i_stackrestore"><tt>llvm.stackrestore</tt></a>. When an
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<tt>llvm.stackrestore</tt> intrinsic is executed with a value saved from
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<tt>llvm.stacksave</tt>, it effectively restores the state of the stack to the
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state it was in when the <tt>llvm.stacksave</tt> intrinsic executed. In
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practice, this pops any <a href="#i_alloca">alloca</a> blocks from the stack
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that were allocated after the <tt>llvm.stacksave</tt> was executed.
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</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="i_stackrestore">'<tt>llvm.stackrestore</tt>' Intrinsic</a>
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</div>
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<div class="doc_text">
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<h5>Syntax:</h5>
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<pre>
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declare void %llvm.stackrestore(sbyte* %ptr)
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</pre>
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<h5>Overview:</h5>
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<p>
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The '<tt>llvm.stackrestore</tt>' intrinsic is used to restore the state of
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the function stack to the state it was in when the corresponding <a
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href="#llvm.stacksave"><tt>llvm.stacksave</tt></a> intrinsic executed. This is
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useful for implementing language features like scoped automatic variable sized
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arrays in C99.
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</p>
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<h5>Semantics:</h5>
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<p>
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See the description for <a href="#i_stacksave"><tt>llvm.stacksave</tt></a>.
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</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="i_prefetch">'<tt>llvm.prefetch</tt>' Intrinsic</a>
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