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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - DenseMapInfo for PointerEmbeddedInt runs afoul of assertions"
href="https://llvm.org/bugs/show_bug.cgi?id=31764">31764</a>
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<th>Summary</th>
<td>DenseMapInfo for PointerEmbeddedInt runs afoul of assertions
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
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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>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Support Libraries
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>jordan_rose@apple.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
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<pre>The DenseMapInfo for PointerEmbeddedInt looks like this:
static inline T getEmptyKey() { return IntInfo::getEmptyKey(); }
static inline T getTombstoneKey() { return IntInfo::getTombstoneKey(); }
But the empty and tombstone values for a pointer-sized integer are likely out
of range for a PointerEmbeddedInt, which means we immediately get assertion
failures when DenseMap tries to use these values. At the very least we should
be truncating the right number of bits; a more holistic solution would allow
DenseMap to store a different representation than the formal key type.</pre>
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