https://bugs.llvm.org/show_bug.cgi?id=50953
Bug ID: 50953
Summary: Missing optimization: if constexpr(false) prevents
NRVO
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
Consider the following code:
struct A {
A() = default;
A(A&&);
};
template <bool B>
A foo() {
A a;
if constexpr (B) {
return A();
}
return a;
}
A test() {
return foo<false>();
}
In the above example NRVO for `a` is applied by many compilers, but not clang.
Godbolt playground: https://godbolt.org/z/P8G3zj5GE
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