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Mark as unreachable the default cases in mp_with_index to improve code generation

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This commit is contained in:
Peter Dimov
2018-09-03 17:45:30 +03:00
parent 2364f79088
commit 025779ec15
1 changed files with 37 additions and 15 deletions
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52
include/boost/mp11/detail/mp_with_index.hpp
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@@ -20,6 +20,12 @@
# define BOOST_MP11_CONSTEXPR14 # define BOOST_MP11_CONSTEXPR14
#endif #endif
#if defined( _MSC_VER ) && !defined( __clang__ )
# define BOOST_MP11_UNREACHABLE() __assume(false)
#else
# define BOOST_MP11_UNREACHABLE() __builtin_unreachable()
#endif
namespace boost namespace boost
{ {
namespace mp11 namespace mp11
@@ -75,7 +81,8 @@ template<> struct mp_with_index_impl_<2>
switch( i ) switch( i )
{ {
case 0: return std::forward<F>(f)( mp_size_t<K+0>() ); case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
default: return std::forward<F>(f)( mp_size_t<K+1>() ); case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -88,7 +95,8 @@ template<> struct mp_with_index_impl_<3>
{ {
case 0: return std::forward<F>(f)( mp_size_t<K+0>() ); case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() ); case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
default: return std::forward<F>(f)( mp_size_t<K+2>() ); case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -102,7 +110,8 @@ template<> struct mp_with_index_impl_<4>
case 0: return std::forward<F>(f)( mp_size_t<K+0>() ); case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() ); case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() ); case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
default: return std::forward<F>(f)( mp_size_t<K+3>() ); case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -117,7 +126,8 @@ template<> struct mp_with_index_impl_<5>
case 1: return std::forward<F>(f)( mp_size_t<K+1>() ); case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() ); case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() ); case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
default: return std::forward<F>(f)( mp_size_t<K+4>() ); case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -133,7 +143,8 @@ template<> struct mp_with_index_impl_<6>
case 2: return std::forward<F>(f)( mp_size_t<K+2>() ); case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() ); case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() ); case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
default: return std::forward<F>(f)( mp_size_t<K+5>() ); case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -150,7 +161,8 @@ template<> struct mp_with_index_impl_<7>
case 3: return std::forward<F>(f)( mp_size_t<K+3>() ); case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() ); case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() ); case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
default: return std::forward<F>(f)( mp_size_t<K+6>() ); case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -168,7 +180,8 @@ template<> struct mp_with_index_impl_<8>
case 4: return std::forward<F>(f)( mp_size_t<K+4>() ); case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() ); case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
case 6: return std::forward<F>(f)( mp_size_t<K+6>() ); case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
default: return std::forward<F>(f)( mp_size_t<K+7>() ); case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -187,7 +200,8 @@ template<> struct mp_with_index_impl_<9>
case 5: return std::forward<F>(f)( mp_size_t<K+5>() ); case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
case 6: return std::forward<F>(f)( mp_size_t<K+6>() ); case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
case 7: return std::forward<F>(f)( mp_size_t<K+7>() ); case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
default: return std::forward<F>(f)( mp_size_t<K+8>() ); case 8: return std::forward<F>(f)( mp_size_t<K+8>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -207,7 +221,8 @@ template<> struct mp_with_index_impl_<10>
case 6: return std::forward<F>(f)( mp_size_t<K+6>() ); case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
case 7: return std::forward<F>(f)( mp_size_t<K+7>() ); case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
case 8: return std::forward<F>(f)( mp_size_t<K+8>() ); case 8: return std::forward<F>(f)( mp_size_t<K+8>() );
default: return std::forward<F>(f)( mp_size_t<K+9>() ); case 9: return std::forward<F>(f)( mp_size_t<K+9>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -228,7 +243,8 @@ template<> struct mp_with_index_impl_<11>
case 7: return std::forward<F>(f)( mp_size_t<K+7>() ); case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
case 8: return std::forward<F>(f)( mp_size_t<K+8>() ); case 8: return std::forward<F>(f)( mp_size_t<K+8>() );
case 9: return std::forward<F>(f)( mp_size_t<K+9>() ); case 9: return std::forward<F>(f)( mp_size_t<K+9>() );
default: return std::forward<F>(f)( mp_size_t<K+10>() ); case 10: return std::forward<F>(f)( mp_size_t<K+10>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -250,7 +266,8 @@ template<> struct mp_with_index_impl_<12>
case 8: return std::forward<F>(f)( mp_size_t<K+8>() ); case 8: return std::forward<F>(f)( mp_size_t<K+8>() );
case 9: return std::forward<F>(f)( mp_size_t<K+9>() ); case 9: return std::forward<F>(f)( mp_size_t<K+9>() );
case 10: return std::forward<F>(f)( mp_size_t<K+10>() ); case 10: return std::forward<F>(f)( mp_size_t<K+10>() );
default: return std::forward<F>(f)( mp_size_t<K+11>() ); case 11: return std::forward<F>(f)( mp_size_t<K+11>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -273,7 +290,8 @@ template<> struct mp_with_index_impl_<13>
case 9: return std::forward<F>(f)( mp_size_t<K+9>() ); case 9: return std::forward<F>(f)( mp_size_t<K+9>() );
case 10: return std::forward<F>(f)( mp_size_t<K+10>() ); case 10: return std::forward<F>(f)( mp_size_t<K+10>() );
case 11: return std::forward<F>(f)( mp_size_t<K+11>() ); case 11: return std::forward<F>(f)( mp_size_t<K+11>() );
default: return std::forward<F>(f)( mp_size_t<K+12>() ); case 12: return std::forward<F>(f)( mp_size_t<K+12>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -297,7 +315,8 @@ template<> struct mp_with_index_impl_<14>
case 10: return std::forward<F>(f)( mp_size_t<K+10>() ); case 10: return std::forward<F>(f)( mp_size_t<K+10>() );
case 11: return std::forward<F>(f)( mp_size_t<K+11>() ); case 11: return std::forward<F>(f)( mp_size_t<K+11>() );
case 12: return std::forward<F>(f)( mp_size_t<K+12>() ); case 12: return std::forward<F>(f)( mp_size_t<K+12>() );
default: return std::forward<F>(f)( mp_size_t<K+13>() ); case 13: return std::forward<F>(f)( mp_size_t<K+13>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -322,7 +341,8 @@ template<> struct mp_with_index_impl_<15>
case 11: return std::forward<F>(f)( mp_size_t<K+11>() ); case 11: return std::forward<F>(f)( mp_size_t<K+11>() );
case 12: return std::forward<F>(f)( mp_size_t<K+12>() ); case 12: return std::forward<F>(f)( mp_size_t<K+12>() );
case 13: return std::forward<F>(f)( mp_size_t<K+13>() ); case 13: return std::forward<F>(f)( mp_size_t<K+13>() );
default: return std::forward<F>(f)( mp_size_t<K+14>() ); case 14: return std::forward<F>(f)( mp_size_t<K+14>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -348,7 +368,8 @@ template<> struct mp_with_index_impl_<16>
case 12: return std::forward<F>(f)( mp_size_t<K+12>() ); case 12: return std::forward<F>(f)( mp_size_t<K+12>() );
case 13: return std::forward<F>(f)( mp_size_t<K+13>() ); case 13: return std::forward<F>(f)( mp_size_t<K+13>() );
case 14: return std::forward<F>(f)( mp_size_t<K+14>() ); case 14: return std::forward<F>(f)( mp_size_t<K+14>() );
default: return std::forward<F>(f)( mp_size_t<K+15>() ); case 15: return std::forward<F>(f)( mp_size_t<K+15>() );
default: BOOST_MP11_UNREACHABLE();
} }
} }
}; };
@@ -367,6 +388,7 @@ template<class N, class F> inline BOOST_MP11_CONSTEXPR14 decltype(std::declval<F
} }
#undef BOOST_MP11_CONSTEXPR14 #undef BOOST_MP11_CONSTEXPR14
#undef BOOST_MP11_UNREACHABLE
} // namespace mp11 } // namespace mp11
} // namespace boost } // namespace boost