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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LangRef NonAtomic documentation incomplete w.r.t volatile and write-write races"
href="https://bugs.llvm.org/show_bug.cgi?id=42435">42435</a>
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<th>Summary</th>
<td>LangRef NonAtomic documentation incomplete w.r.t volatile and write-write races
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<th>Product</th>
<td>Documentation
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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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>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>General docs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>gonzalobg88@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<pre>The Lang ref mentions here (<a href="https://llvm.org/docs/Atomics.html#notatomic">https://llvm.org/docs/Atomics.html#notatomic</a>) that
when there is a data-race, loads return undef.
What if the load is volatile? Does it also return undef ?
Does this mean that the write that participates in the race does not invoke
undefined behavior?
What happens with write-write races? What if the NonAtomic writes involved are
volatile?</pre>
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