[LLVMdev] Non-immutable alias analysis

Shacham, Ohad ohad.shacham at intel.com
Tue Dec 4 23:11:49 PST 2012


I wrote a module pass that uses Alias Analysis.
For this reason I added AU.addRequired<AliasAnalysis>() to function getAnalysisUsage and used getAnalysis<AliasAnalysis>() in my pass.
I tried a few types of alias analyses and I discovered that only alias analyses which are ImmutablePasses are returned using getAnalysis<AliasAnalysis>(). Moreover, when I added both ImmutablePass and FunctionPass, getAnalysis<AliasAnalysis>() returned the ImmutablePass while the FunctionPass did not even appear in the AA chain ( I assume it is because building the chain uses getAnalysis as well).

Does this feature should be supported?


Intel Israel (74) Limited

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