https://llvm.org/bugs/show_bug.cgi?id=31764
Bug ID: 31764
Summary: DenseMapInfo for PointerEmbeddedInt runs afoul of
assertions
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Support Libraries
Assignee: unassignedb...@nondot.org
Reporter: jordan_r...@apple.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
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.
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