[cfe-commits] [PATCH] [msan] Add simplifycfg before msan at O0

[Evgeniy Stepanov]

Hi kcc,

MemorySanitizer can't handle unreachable BB's

http://llvm-reviews.chandlerc.com/D207

Files:
  lib/CodeGen/BackendUtil.cpp

Index: lib/CodeGen/BackendUtil.cpp
===================================================================
--- lib/CodeGen/BackendUtil.cpp
+++ lib/CodeGen/BackendUtil.cpp
@@ -188,6 +188,9 @@
 
 static void addMemorySanitizerPass(const PassManagerBuilder &Builder,
                                    PassManagerBase &PM) {
+  // MSan does not like unreachable BB's.                                                                                     
+  if (Builder.OptLevel == 0)
+    PM.add(createCFGSimplificationPass());
   PM.add(createMemorySanitizerPass());
 }
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