https://llvm.org/bugs/show_bug.cgi?id=26196
Bug ID: 26196
Summary: CodeGenMapTable can fail to delete duplicate
ColFieldValueMap entries
Product: tools
Version: 3.7
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: TableGen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
There is a loop in emitEnums() (CodeGenMapTable.cpp) whose purpose is to remove
duplicate column field values. I think this loop is wrong because it increments
the loop counter regardless of whether a duplicate value is deleted or not.
When a duplicate _is_ deleted, the next value is skipped. So two duplicate
values is OK but if there are 3 consecutive duplicates, the third one isn't
deleted.
This is a problem, for me at least, because I end up with an enum that has
duplicate enumerators and my instruction mapping code won't compile.
I guess an easy fix would be to decrement j whenever a value is deleted.
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