https://bugs.llvm.org/show_bug.cgi?id=42642
Bug ID: 42642
Summary: std::nullptr_t in aggregates does not follow ABI
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: mv...@google.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
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: https://gcc.godbolt.org/z/IxLudk
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