[llvm-bugs] [Bug 26656] New: std::swap does not work with vector types

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26656

            Bug ID: 26656
           Summary: std::swap does not work with vector types
           Product: libc++
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: eugeni.stepanov at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

#include <utility>

typedef float T  __attribute__((__vector_size__(16)));

void f(T &a, T &b) {
  std::swap(a, b);
}


1.cc:7:3: error: no matching function for call to 'swap'
  std::swap(a, b);
  ^~~~~~~~~
/code/build-llvm/bin/../include/c++/v1/type_traits:4240:5: note: candidate
template ignored: disabled by 'enable_if' [with _Tp =
      __attribute__((__vector_size__(4 * sizeof(float)))) float]
    is_move_constructible<_Tp>::value &&
    ^
/code/build-llvm/bin/../include/c++/v1/utility:245:1: note: candidate template
ignored: could not match '_Tp [_Np]' against 'T'
      (vector of 4 'float' values)
swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np])
_NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
^
/code/build-llvm/bin/../include/c++/v1/utility:495:1: note: candidate template
ignored: could not match
      'pair<type-parameter-0-0, type-parameter-0-1>' against
'__attribute__((__vector_size__(4 * sizeof(float)))) float'
      (vector of 4 'float' values)
swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
^
1 error generated.

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