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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - GlobalDCE.cpp / isEmptyFunction doesn't skip debug intrinsics"
href="https://bugs.llvm.org/show_bug.cgi?id=39669">39669</a>
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<th>Summary</th>
<td>GlobalDCE.cpp / isEmptyFunction doesn't skip debug intrinsics
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>DebugInfo
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>aprantl@apple.com
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<th>CC</th>
<td>jdevlieghere@apple.com, keith.walker@arm.com, llvm-bugs@lists.llvm.org
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<pre>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.</pre>
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