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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - std::nullptr_t in aggregates does not follow ABI"
href="https://bugs.llvm.org/show_bug.cgi?id=42642">42642</a>
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<th>Summary</th>
<td>std::nullptr_t in aggregates does not follow ABI
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
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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>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>mvels@google.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>When you create a trivial aggregate containing std::nullptr_t, it does not get
passed through RDI/RSI, but gets classified as a memory arg
E.g.:
struct MyVar1 {
int x = 3;
std::nullptr_t n = nullptr;
};
void Foo(MyVar1 x);
void CallMyVar1() {
MyVar1 m;
Foo(m); // Sets up stack frame and passes as pointer / MEMORY
}
GCC does this correct.
More elaborate examples: <a href="https://gcc.godbolt.org/z/IxLudk">https://gcc.godbolt.org/z/IxLudk</a></pre>
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