_GLIBCXX_SIMD_INTRINSIC constexpr _To
__bit_cast(const _From __x)
{
- // TODO: implement with / replace by __builtin_bit_cast ASAP
+#if __has_builtin(__builtin_bit_cast)
+ return __builtin_bit_cast(_To, __x);
+#else
static_assert(sizeof(_To) == sizeof(_From));
constexpr bool __to_is_vectorizable
= is_arithmetic_v<_To> || is_enum_v<_To>;
reinterpret_cast<const char*>(&__x), sizeof(_To));
return __r;
}
+#endif
}
// }}}
return {__private_init, _RM::abi_type::_MaskImpl::template _S_convert<
typename _RM::simd_type::value_type>(__x)};
}
+
+template <typename _To, typename _Up, typename _Abi>
+ _GLIBCXX_SIMD_INTRINSIC _GLIBCXX_SIMD_CONSTEXPR
+ _To
+ simd_bit_cast(const simd<_Up, _Abi>& __x)
+ {
+ using _Tp = typename _To::value_type;
+ using _ToMember = typename _SimdTraits<_Tp, typename _To::abi_type>::_SimdMember;
+ using _From = simd<_Up, _Abi>;
+ using _FromMember = typename _SimdTraits<_Up, _Abi>::_SimdMember;
+ // with concepts, the following should be constraints
+ static_assert(sizeof(_To) == sizeof(_From));
+ static_assert(is_trivially_copyable_v<_Tp> && is_trivially_copyable_v<_Up>);
+ static_assert(is_trivially_copyable_v<_ToMember> && is_trivially_copyable_v<_FromMember>);
+#if __has_builtin(__builtin_bit_cast)
+ return {__private_init, __builtin_bit_cast(_ToMember, __data(__x))};
+#else
+ return {__private_init, __bit_cast<_ToMember>(__data(__x))};
+#endif
+ }
+
+template <typename _To, typename _Up, typename _Abi>
+ _GLIBCXX_SIMD_INTRINSIC _GLIBCXX_SIMD_CONSTEXPR
+ _To
+ simd_bit_cast(const simd_mask<_Up, _Abi>& __x)
+ {
+ using _From = simd_mask<_Up, _Abi>;
+ static_assert(sizeof(_To) == sizeof(_From));
+ static_assert(is_trivially_copyable_v<_From>);
+ // _To can be simd<T, A>, specifically simd<T, fixed_size<N>> in which case _To is not trivially
+ // copyable.
+ if constexpr (is_simd_v<_To>)
+ {
+ using _Tp = typename _To::value_type;
+ using _ToMember = typename _SimdTraits<_Tp, typename _To::abi_type>::_SimdMember;
+ static_assert(is_trivially_copyable_v<_ToMember>);
+#if __has_builtin(__builtin_bit_cast)
+ return {__private_init, __builtin_bit_cast(_ToMember, __x)};
+#else
+ return {__private_init, __bit_cast<_ToMember>(__x)};
+#endif
+ }
+ else
+ {
+ static_assert(is_trivially_copyable_v<_To>);
+#if __has_builtin(__builtin_bit_cast)
+ return __builtin_bit_cast(_To, __x);
+#else
+ return __bit_cast<_To>(__x);
+#endif
+ }
+ }
} // namespace __proposed
// simd_cast {{{2
using _Vp = simd<_Tp, _Abi>;
using _Up = make_unsigned_t<__int_for_sizeof_t<_Tp>>;
using namespace std::experimental::__float_bitwise_operators;
+ using namespace std::experimental::__proposed;
const _Vp __exponent_mask
= __infinity_v<_Tp>; // 0x7f800000 or 0x7ff0000000000000
return static_simd_cast<rebind_simd_t<int, _Vp>>(
- __bit_cast<rebind_simd_t<_Up, _Vp>>(__v & __exponent_mask)
+ simd_bit_cast<rebind_simd_t<_Up, _Vp>>(__v & __exponent_mask)
>> (__digits_v<_Tp> - 1));
}
// (inf and NaN are excluded by -ffinite-math-only)
const auto __iszero_inf_nan = __x == 0;
#else
- const auto __as_int
- = __bit_cast<rebind_simd_t<__int_for_sizeof_t<_Tp>, _V>>(abs(__x));
- const auto __inf
- = __bit_cast<rebind_simd_t<__int_for_sizeof_t<_Tp>, _V>>(
- _V(__infinity_v<_Tp>));
+ using _Ip = __int_for_sizeof_t<_Tp>;
+ const auto __as_int = simd_bit_cast<rebind_simd_t<_Ip, _V>>(abs(__x));
+ const auto __inf = simd_bit_cast<rebind_simd_t<_Ip, _V>>(_V(__infinity_v<_Tp>));
const auto __iszero_inf_nan = static_simd_cast<typename _V::mask_type>(
__as_int == 0 || __as_int >= __inf);
#endif
where(__value_isnormal.__cvt(), __e) = __exponent_bits;
static_assert(sizeof(_IV) == sizeof(__value_isnormal));
const _IV __offset
- = (__bit_cast<_IV>(__value_isnormal) & _IV(__exp_adjust))
- | (__bit_cast<_IV>(static_simd_cast<_MaskType>(__exponent_bits == 0)
- & static_simd_cast<_MaskType>(__x != 0))
- & _IV(__exp_adjust + __exp_offset));
+ = (simd_bit_cast<_IV>(__value_isnormal) & _IV(__exp_adjust))
+ | (simd_bit_cast<_IV>(static_simd_cast<_MaskType>(__exponent_bits == 0)
+ & static_simd_cast<_MaskType>(__x != 0))
+ & _IV(__exp_adjust + __exp_offset));
*__exp = simd_cast<_Samesize<int, _V>>(__e - __offset);
return __mant;
}
using namespace std::experimental::__proposed;
using _IV = rebind_simd_t<
conditional_t<sizeof(_Tp) == sizeof(_LLong), _LLong, int>, _V>;
- return (__bit_cast<_IV>(__v) >> (__digits_v<_Tp> - 1))
+ return (simd_bit_cast<_IV>(__v) >> (__digits_v<_Tp> - 1))
- (__max_exponent_v<_Tp> - 1);
};
_V __r = static_simd_cast<_V>(__exponent(abs_x));
// Skylake-AVX512 (not even for SSE and AVX vectors, and really bad for
// AVX-512).
using namespace __float_bitwise_operators;
+ using namespace __proposed;
_V __absx = abs(__x); // no error
_V __absy = abs(__y); // no error
_V __hi = max(__absx, __absy); // no error
#ifdef __FAST_MATH__
using _Ip = __int_for_sizeof_t<_Tp>;
using _IV = rebind_simd_t<_Ip, _V>;
- const auto __as_int = __bit_cast<_IV>(__hi_exp);
+ const auto __as_int = simd_bit_cast<_IV>(__hi_exp);
const _V __scale
- = __bit_cast<_V>(2 * __bit_cast<_Ip>(_Tp(1)) - __as_int);
+ = simd_bit_cast<_V>(2 * simd_bit_cast<_Ip>(_Tp(1)) - __as_int);
#else
const _V __scale = (__hi_exp ^ __inf) * _Tp(.5);
#endif
else
{
using namespace __float_bitwise_operators;
+ using namespace __proposed;
const _V __absx = abs(__x); // no error
const _V __absy = abs(__y); // no error
const _V __absz = abs(__z); // no error
#ifdef __FAST_MATH__
using _Ip = __int_for_sizeof_t<_Tp>;
using _IV = rebind_simd_t<_Ip, _V>;
- const auto __as_int = __bit_cast<_IV>(__hi_exp);
+ const auto __as_int = simd_bit_cast<_IV>(__hi_exp);
const _V __scale
- = __bit_cast<_V>(2 * __bit_cast<_Ip>(_Tp(1)) - __as_int);
+ = simd_bit_cast<_V>(2 * simd_bit_cast<_Ip>(_Tp(1)) - __as_int);
#else
const _V __scale = (__hi_exp ^ __inf) * _Tp(.5);
#endif
return std::copysign(__x[0], __y[0]);
else if constexpr (__is_fixed_size_abi_v<_Abi>)
return {__private_init, _Abi::_SimdImpl::_S_copysign(__data(__x), __data(__y))};
- else if constexpr (is_same_v<_Tp, long double> && sizeof(_Tp) == 12)
- // Remove this case once __bit_cast is implemented via __builtin_bit_cast.
- // It is necessary, because __signmask below cannot be computed at compile
- // time.
- return simd<_Tp, _Abi>(
- [&](auto __i) { return std::copysign(__x[__i], __y[__i]); });
else
{
using _V = simd<_Tp, _Abi>;