http://llvm.org/bugs/show_bug.cgi?id=19580
Bug ID: 19580
Summary: MergeFunctions::removeUsers should guard against
repeated values
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Interprocedural Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
When using -mergefunc on a large project, I found it would hang forever and
slowly chew up all my RAM (up to several tens of GB of it). The issue appears
to be a reference loop encountered while running the
MergeFunctions::removeUsers method, meaning that its worklist grows without
bound.
I haven't managed to figure out exactly what causes the loop or to produce a
testcase, but adding a simple "previously seen values" check seems to be fix
the issue for me. I'm attaching the patch in case it's useful to others, or if
it's obviously correct even without understanding the cause of the bug.
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