<p dir="ltr">Why not just remove unreachable blocks in mean directly? It's pretty simple and certainly cheaper than a full simplifycfg pass...</p>
<div class="gmail_quote">On Dec 11, 2012 11:35 PM, "Evgeniy Stepanov" <<a href="mailto:eugenis@google.com">eugenis@google.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi kcc,<br>
<br>
MemorySanitizer can't handle unreachable BB's<br>
<br>
<a href="http://llvm-reviews.chandlerc.com/D207" target="_blank">http://llvm-reviews.chandlerc.com/D207</a><br>
<br>
Files:<br>
  lib/CodeGen/BackendUtil.cpp<br>
<br>
Index: lib/CodeGen/BackendUtil.cpp<br>
===================================================================<br>
--- lib/CodeGen/BackendUtil.cpp<br>
+++ lib/CodeGen/BackendUtil.cpp<br>
@@ -188,6 +188,9 @@<br>
<br>
 static void addMemorySanitizerPass(const PassManagerBuilder &Builder,<br>
                                    PassManagerBase &PM) {<br>
+  // MSan does not like unreachable BB's.<br>
+  if (Builder.OptLevel == 0)<br>
+    PM.add(createCFGSimplificationPass());<br>
   PM.add(createMemorySanitizerPass());<br>
 }<br>
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<br></blockquote></div>