[llvm-bugs] [Bug 49221] New: [C++4OpenCL] reinterpret_cast from T to T not allowed in some cases

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49221

            Bug ID: 49221
           Summary: [C++4OpenCL] reinterpret_cast from T to T not allowed
                    in some cases
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: OpenCL
          Assignee: unassignedclangbugs at nondot.org
          Reporter: marco.antognini at arm.com
                CC: anastasia.stulova at arm.com, llvm-bugs at lists.llvm.org

When casting T to T using reinterpret_cast is often not allowed. This might be
on purpose sometimes, but there are cases when I believe it should be
supported. For example:


kernel void foo() {
  int x;
  auto y = reinterpret_cast<decltype(x)>(x);
  // error: reinterpret_cast from 'int' to 'decltype(x)' (aka '__private int')
is not allowed
}

kernel void goo() {
  reserve_id_t x;
  auto y = reinterpret_cast<reserve_id_t>(x);
  // error: reinterpret_cast from 'reserve_id_t' to 'reserve_id_t' is not
allowed

}

https://godbolt.org/z/e7zqTG


While this is allowed:

kernel void foo() {
  int x;
  auto y = (decltype(x))(x);
}

kernel void goo() {
  reserve_id_t x;
  auto y = (reserve_id_t)(x);
}


https://godbolt.org/z/s7x5zd

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