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

[Chandler Carruth]

Or you could teach mean to handle unreachable blocks... but that is likely
more expensive than removing such blocks...
On Dec 11, 2012 11:39 PM, "Chandler Carruth" <chandlerc at google.com> wrote:

> Why not just remove unreachable blocks in mean directly? It's pretty
> simple and certainly cheaper than a full simplifycfg pass...
> On Dec 11, 2012 11:35 PM, "Evgeniy Stepanov" <eugenis at google.com> wrote:
>
>> 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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>>
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