https://bugs.llvm.org/show_bug.cgi?id=39669
Bug ID: 39669
Summary: GlobalDCE.cpp / isEmptyFunction doesn't skip debug
intrinsics
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: DebugInfo
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
GlobalDCE.cpp / isEmptyFunction is defined as follows:
/// Returns true if F contains only a single "ret" instruction.
static bool isEmptyFunction(Function *F) {
BasicBlock &Entry = F->getEntryBlock();
if (Entry.size() != 1 || !isa<ReturnInst>(Entry.front()))
return false;
ReturnInst &RI = cast<ReturnInst>(Entry.front());
return RI.getReturnValue() == nullptr;
}
used thusly:
// Remove empty functions from the global ctors list.
Changed |= optimizeGlobalCtorsList(M, isEmptyFunction);
If I'm reading this correctly, this means that the presence of debug info could
change the behavior of the optimization, which would be a bug.
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