http://llvm.org/bugs/show_bug.cgi?id=4029
Summary: CallGraph not always deleted before running
gvn/simplifycfg
Product: new-bugs
Version: unspecified
Platform: Other
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Created an attachment (id=2851)
--> (http://llvm.org/bugs/attachment.cgi?id=2851)
Debugging patch that fires an assertion if the callgraph contains deleted
instructions
The test Analysis/GlobalsModRef/purecse.ll runs opt -globalsmodref-aa -gvn
-instcombine. The callgraph constructed for globalsmodref-aa is not destroyed
before gvn is run. Similarly, the test
Transforms/CondProp/2007-08-01-InvalidRead.ll runs opt -inline -tailduplicate
-condprop -simplifycfg, and
the callgraph constructed for -inline is not destroyed before simplifycfg is
run. This is in spite of the fact that gvn/simplifycfg neither require nor
preserve the callgraph.
Spotted using the attached debugging patch (which would be good to commit
one day). My guess is that this is essentially the same problem as PR3601.
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