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Clang doesn't generate a function when using __array_rank #57133

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philnik777 opened this issue Aug 13, 2022 · 4 comments
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Clang doesn't generate a function when using __array_rank #57133

philnik777 opened this issue Aug 13, 2022 · 4 comments
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clang:codegen IR generation bugs: mangling, exceptions, etc. clang:frontend Language frontend issues, e.g. anything involving "Sema"

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@philnik777
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The code (Godbolt)

#include <__type_traits/integral_constant.h>

template <class T>
struct rank : std::integral_constant<int, __array_rank(T)> {};

template <class T>
void test_rank() {
  static_assert(rank<T>::value == 0);
}

void func() {
  test_rank<void>();
}

generates func(), but doesn't generate test_rank<void>().
@philnik777 philnik777 added the clang:codegen IR generation bugs: mangling, exceptions, etc. label Aug 13, 2022
@llvmbot
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llvmbot commented Aug 13, 2022

@llvm/issue-subscribers-clang-codegen

@cjdb
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cjdb commented Sep 25, 2022

Potentially related: return statement in f is ignored.

template<auto v>
struct integral_constant {
    static inline constexpr auto value = v;
};

template<class T>
struct rank : integral_constant<__array_rank(T)> {};

__SIZE_TYPE__ f()
{
  return rank<int[1]>::value;
}

@cjdb cjdb added the clang:frontend Language frontend issues, e.g. anything involving "Sema" label Sep 25, 2022
@llvmbot
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llvmbot commented Sep 25, 2022

@llvm/issue-subscribers-clang-frontend

@philnik777
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Looks like this got fixed in 19: https://godbolt.org/z/WWqdnnYPs

@pinskia pinskia mentioned this issue Jan 19, 2025
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clang:codegen IR generation bugs: mangling, exceptions, etc. clang:frontend Language frontend issues, e.g. anything involving "Sema"
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