https://llvm.org/bugs/show_bug.cgi?id=28754
Bug ID: 28754
Summary: UBSan reports false positives on unaligned memory
accesses on MS ABI
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: resis...@mac.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Microsoft explicitly documents unaligned memory accesses on scalar types to be
allowed under their ABI, though natural alignment is still recommended for
performance reasons. UBSan still reports errors on unaligned scalar accesses,
leading to false positives on code that is compliant with the MS ABI.
Note that Microsoft's document does still require natural alignment for members
of unions and aggregates.
MS alignment documentation for scalar types:
https://msdn.microsoft.com/en-us/library/94z15h2c.aspx
MS alignment documentation for unions and aggregates:
https://msdn.microsoft.com/en-us/library/9dbwhz68.aspx
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