https://bugs.llvm.org/show_bug.cgi?id=46745
Bug ID: 46745
Summary: Assertion `(LocalChanged || (RefHash ==
StructuralHash(F))) && "Pass modifies its input and
doesn't report it."' for -loop-idiom pass
Product: new-bugs
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: david.stenb...@ericsson.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
sguel...@redhat.com
Created attachment 23728
--> https://bugs.llvm.org/attachment.cgi?id=23728&action=edit
IR reproducer.
LLVM commit: 274332282cb4ce167de8e73fb9c59d2eecd67c25
Requires an expensive checks build to reproduce.
$ opt -loop-idiom -disable-basic-aa -S loop-idiom.ll
opt: ../lib/IR/LegacyPassManager.cpp:1591: bool
llvm::FPPassManager::runOnFunction(llvm::Function &): Assertion `(LocalChanged
|| (RefHash == StructuralHash(F))) && "Pass modifies its input and doesn't
report it."' failed.
After some very shallow troubleshooting, the issue seems to be that we return
false in this case:
if (mayLoopAccessLocation(BasePtr, ModRefInfo::ModRef, CurLoop, BECount,
StoreSize, *AA, Stores)) {
Expander.clear();
// If we generated new code for the base pointer, clean up.
RecursivelyDeleteTriviallyDeadInstructions(BasePtr, TLI);
return false;
}
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