[llvm-commits] CVS: llvm/docs/AliasAnalysis.html
Chris Lattner
lattner at cs.uiuc.edu
Mon Jun 28 14:21:02 PDT 2004
Changes in directory llvm/docs:
AliasAnalysis.html updated: 1.20 -> 1.21
---
Log message:
document new pass
---
Diffs of the changes: (+22 -1)
Index: llvm/docs/AliasAnalysis.html
diff -u llvm/docs/AliasAnalysis.html:1.20 llvm/docs/AliasAnalysis.html:1.21
--- llvm/docs/AliasAnalysis.html:1.20 Mon Jun 21 17:52:48 2004
+++ llvm/docs/AliasAnalysis.html Mon Jun 28 14:19:47 2004
@@ -690,6 +690,27 @@
</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>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection">
@@ -916,7 +937,7 @@
<a href="mailto:sabre at nondot.org">Chris Lattner</a><br>
<a href="http://llvm.cs.uiuc.edu">LLVM Compiler Infrastructure</a><br>
- Last modified: $Date: 2004/06/21 22:52:48 $
+ Last modified: $Date: 2004/06/28 19:19:47 $
</address>
</body>
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