https://llvm.org/bugs/show_bug.cgi?id=28326
Bug ID: 28326
Summary: Clang implementation of _InterlockedAnd in intrin.h
doesn't follow official behavior
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Headers
Assignee: unassignedclangb...@nondot.org
Reporter: chris.cavala...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Looking at the source of intrin.h
(https://github.com/llvm-mirror/clang/blob/c0be6ec1bf4aeb27228c27cd807c3d4a9b759c4a/lib/Headers/intrin.h
for the most recent version) I can see that _InterlockedAnd is implemented with
a call to __atomic_and_fetch which if I'm not wrong returns the value in the
variable after then "and" is done. But the MSDN suggests it should return the
value before the "and"
https://msdn.microsoft.com/en-us/library/dsx2t7yd.aspx
Return Value
The original value of the first operand.
It should probably be a call to __atomic_fetch_and instead.
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