[LLVMdev] DebugAA, GVN bug?

Will Dietz willdtz at gmail.com
Thu Jul 8 11:09:34 PDT 2010

Hi all,

While testing my own AA, I found it being queried for values that
didn't exist previously.  Luckily there's a pass built into LLVM for
catching such things, "Debug-AA", and I used that to confirm that GVN
does this fairly frequently.

I've attached a test case that triggers the bug (reduced from
Stanford/Treesort, for whatever that's worth), this is on LLVM 2.7.

Should this be filed as a bug....?

Additionally it just seems.. /unfortunate/ that we have a pass
specifically designed to catch bugs like this, yet it's not being
used.  Don't suppose this is something someone would feel motivated to
add this to some LLVM testing code? :)

Thanks for your time,

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