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ircd::simd: Improve lane_cast related template.

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This commit is contained in:
Jason Volk 2020-06-27 15:42:15 -07:00
parent d26fed6a20
commit cdc6c03ec6
1 changed files with 14 additions and 6 deletions
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20
include/ircd/simd/simd.h
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@ -25,9 +25,7 @@ namespace ircd::simd
template<int bits> u256x1 shl(const u256x1 &a) noexcept;
template<int bits> u256x1 shr(const u256x1 &a) noexcept;
// Convert each lane from a smaller type to a larger type
template<class R, class T> R explode(const T &);
template<class R> R explode(const u8x16 &);
template<class R, class T> R lane_cast(const T &);
}
namespace ircd
@ -36,12 +34,22 @@ namespace ircd
using simd::shr;
}
template<class R>
/// Convert each lane from a smaller type to a larger type
template<class R,
class T>
inline R
ircd::simd::explode(const u8x16 &in)
ircd::simd::lane_cast(const T &in)
{
static_assert
(
lanes<R>() == lanes<T>(), "Types must have matching number of lanes."
);
if constexpr(__has_builtin(__builtin_convertvector))
return __builtin_convertvector(in, R);
R ret;
for(size_t i(0); i < 16; ++i)
for(size_t i(0); i < lanes<R>(); ++i)
ret[i] = in[i];
return ret;