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ircd::utf: Add glue for missing GCC vector scaling.

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This commit is contained in:
Jason Volk 2020-07-14 17:48:29 -07:00
parent 566029bdb0
commit 1fa358d9a8
1 changed files with 82 additions and 4 deletions
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86
ircd/utf.cc
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@ -366,7 +366,8 @@ noexcept
namespace ircd::utf8
{
template<class u32xN> static u32xN _encode(const u32xN codepoint) noexcept;
template<class u32xN>
static u32xN _encode(const u32xN codepoint) noexcept;
}
ircd::u32x4
@ -379,22 +380,60 @@ noexcept
ircd::u32x8
ircd::utf8::encode(const u32x8 codepoint)
noexcept
#ifdef __AVX2__
{
return _encode(codepoint);
}
#else // This block is only effective for GCC. Clang performs this automatically.
{
u32x4 cp[2];
for(size_t i(0); i < 2; ++i)
for(size_t j(0); j < 4; ++j)
cp[i][j] = codepoint[(i + 1) * j];
cp[0] = _encode(cp[0]);
cp[1] = _encode(cp[1]);
u32x8 ret;
for(size_t i(0); i < 2; ++i)
for(size_t j(0); j < 4; ++j)
ret[(i + 1) * j] = cp[i][j];
return ret;
}
#endif
ircd::u32x16
ircd::utf8::encode(const u32x16 codepoint)
noexcept
#ifdef __AVX512F__
{
return _encode(codepoint);
}
#else // This block is only effective for GCC. Clang performs this automatically.
{
u32x8 cp[2];
for(size_t i(0); i < 2; ++i)
for(size_t j(0); j < 8; ++j)
cp[i][j] = codepoint[(i + 1) * j];
cp[0] = encode(cp[0]);
cp[1] = encode(cp[1]);
u32x16 ret;
for(size_t i(0); i < 2; ++i)
for(size_t j(0); j < 8; ++j)
ret[(i + 1) * j] = cp[i][j];
return ret;
}
#endif
/// Transform multiple char32_t codepoints to their utf-8 encodings in
/// parallel, returning a sparse result in each char32_t (this does not
/// compress the result down).
template<class u32xN>
u32xN
inline u32xN
ircd::utf8::_encode(const u32xN codepoint)
noexcept
{
@ -435,7 +474,8 @@ noexcept
namespace ircd::utf8
{
template<class u32xN> static u32xN _length(const u32xN codepoint) noexcept;
template<class u32xN>
static u32xN _length(const u32xN codepoint) noexcept;
}
ircd::u32x4
@ -448,22 +488,60 @@ noexcept
ircd::u32x8
ircd::utf8::length(const u32x8 codepoint)
noexcept
#ifdef __AVX2__
{
return _length(codepoint);
}
#else // This block is only effective for GCC. Clang performs this automatically.
{
u32x4 cp[2];
for(size_t i(0); i < 2; ++i)
for(size_t j(0); j < 4; ++j)
cp[i][j] = codepoint[(i + 1) * j];
cp[0] = _length(cp[0]);
cp[1] = _length(cp[1]);
u32x8 ret;
for(size_t i(0); i < 2; ++i)
for(size_t j(0); j < 4; ++j)
ret[(i + 1) * j] = cp[i][j];
return ret;
}
#endif
ircd::u32x16
ircd::utf8::length(const u32x16 codepoint)
noexcept
#ifdef __AVX512F__
{
return _length(codepoint);
}
#else // This block is only effective for GCC. Clang performs this automatically.
{
u32x8 cp[2];
for(size_t i(0); i < 2; ++i)
for(size_t j(0); j < 8; ++j)
cp[i][j] = codepoint[(i + 1) * j];
cp[0] = length(cp[0]);
cp[1] = length(cp[1]);
u32x16 ret;
for(size_t i(0); i < 2; ++i)
for(size_t j(0); j < 8; ++j)
ret[(i + 1) * j] = cp[i][j];
return ret;
}
#endif
/// Determine the utf-8 encoding length of multiple codepoints in parallel.
/// The input vector char32_t codepoints and the output yields an integer
/// of 0-4 for each lane.
template<class u32xN>
u32xN
inline u32xN
ircd::utf8::_length(const u32xN codepoint)
noexcept
{