https://bugs.llvm.org/show_bug.cgi?id=36105
Bug ID: 36105
Summary: Infinite loop in -callsite-splitting
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: mikael.hol...@ericsson.com
CC: llvm-bugs@lists.llvm.org
Created attachment 19755
--> https://bugs.llvm.org/attachment.cgi?id=19755&action=edit
reproducer
Running
opt -S -o - foo.ll -callsite-splitting
we get stuck and loop forever in function recordConditions in
CallSitesplitting.cpp:
/// Record ICmp conditions relevant to any argument in CS following Pred's
/// single successors. If there are conflicting conditions along a path, like
/// x == 1 and x == 0, the first condition will be used.
static void recordConditions(CallSite CS, BasicBlock *Pred,
ConditionsTy &Conditions) {
recordCondition(CS, Pred, CS.getInstruction()->getParent(), Conditions);
BasicBlock *From = Pred;
BasicBlock *To = Pred;
SmallPtrSet<BasicBlock *, 4> Visited = {From};
while (!Visited.count(From->getSinglePredecessor()) &&
(From = From->getSinglePredecessor())) {
recordCondition(CS, From, To, Conditions);
To = From;
}
}
It looks suspicious to me that Visited isn't updated in the loop.
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