[Bug libstdc++/58625] New: std::signbit always converts to double

[olegendo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58625

            Bug ID: 58625
           Summary: std::signbit always converts to double
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: olegendo at gcc dot gnu.org

In file libstdc++-v4/include/c_global:

  constexpr bool
  signbit(float __x)
  { return __builtin_signbit(__x); }

  constexpr bool
  signbit(double __x)
  { return __builtin_signbit(__x); }

  constexpr bool
  signbit(long double __x)
  { return __builtin_signbit(__x); }


I believe this is supposed to be:

  constexpr bool
  signbit(float __x)
  { return __builtin_signbitf(__x); }

  constexpr bool
  signbit(double __x)
  { return __builtin_signbit(__x); }

  constexpr bool
  signbit(long double __x)
  { return __builtin_signbitl(__x); }

As it is right now, std::signbit always does a conversion to double.