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document new pass

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14471 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2004-06-28 19:19:47 +00:00
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docs/AliasAnalysis.html
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@ -690,6 +690,27 @@ aggressive local analysis that "knows" many important facts:</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection">
<a name="globalsmodref">The <tt>-globalsmodref-aa</tt> pass</a>
</div>
<div class="doc_text">
<p>This pass implements a simple context-sensitive mod/ref and alias analysis
for internal global variables that don't "have their address taken". If a
global does not have its address taken, the pass knows that no pointers alias
the global.
</p>
<p>The real power of this pass is that it provides context-sensitive mod/ref
information for call instructions. This allows the optimizer to know that
calls to a function do not clobber or read the value of the global, allowing
loads and stores to be eliminated.</p>
<p>Note that this pass is somewhat limited in its scope (only support
non-address taken globals), but is very quick analysis.</p>
</div>
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<div class="doc_subsubsection">