https://llvm.org/bugs/show_bug.cgi?id=30370
Bug ID: 30370
Summary: Assert in LegacyPassManager when adding
PostDominatorTree to analysis pass
Product: new-bugs
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: christof.do...@arm.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17255
--> https://llvm.org/bugs/attachment.cgi?id=17255&action=edit
reproducer - created against svn revision 281213.
When I add PostDominatorTree analysis pass to scalar-evolution (as a transitive
requirement) the LegacyPassManager run into an assert:
opt: ../lib/IR/LegacyPassManager.cpp:520: void
llvm::PMTopLevelManager::setLastUser(llvm::ArrayRef<llvm::Pass*>, llvm::Pass*):
Assertion `AnalysisPass && "Expected analysis pass to exist."' failed.
This looks like a bad interaction between the new PassManager and the
LegacyPassManager.
To reproduce, use the attached patch on ScalarEvolution.cpp that only adds
PostDominatorTree as a required pass and run using:
true | opt -loop-idiom -loop-unroll
This currently blocks my attempt to solve bug 28429.
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