Skip to content

Add AVX512VL gather scatter kernels #1373

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
DiamonDinoia merged 1 commit into from
Jul 8, 2026
+132 −0
Merged

Add AVX512VL gather scatter kernels #1373

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
66 changes: 66 additions & 0 deletions include/xsimd/arch/xsimd_avx512vl_128.hpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -335,6 +335,72 @@ namespace xsimd
detail::maskstore128(mem, src, mask.mask(), Mode {});
}

// gather
template <class T, class A, class U, detail::enable_sized_integral_t<T, 4> = 0, detail::enable_sized_integral_t<U, 4> = 0>
XSIMD_INLINE batch<T, A> gather(batch<T, A> const&, T const* src, batch<U, A> const& index,
kernel::requires_arch<avx512vl_128>) noexcept
{
return _mm_mmask_i32gather_epi32(_mm_setzero_si128(), (__mmask8)0xF, index, static_cast<const void*>(src), sizeof(T));
}

template <class T, class A, class U, detail::enable_sized_integral_t<T, 8> = 0, detail::enable_sized_integral_t<U, 8> = 0>
XSIMD_INLINE batch<T, A> gather(batch<T, A> const&, T const* src, batch<U, A> const& index,
kernel::requires_arch<avx512vl_128>) noexcept
{
return _mm_mmask_i64gather_epi64(_mm_setzero_si128(), (__mmask8)0x3, index, static_cast<const void*>(src), sizeof(T));
}

template <class A, class U, detail::enable_sized_integral_t<U, 4> = 0>
XSIMD_INLINE batch<float, A> gather(batch<float, A> const&, float const* src,
batch<U, A> const& index,
kernel::requires_arch<avx512vl_128>) noexcept
{
return _mm_mmask_i32gather_ps(_mm_setzero_ps(), (__mmask8)0xF, index, src, sizeof(float));
}

template <class A, class U, detail::enable_sized_integral_t<U, 8> = 0>
XSIMD_INLINE batch<double, A> gather(batch<double, A> const&, double const* src,
batch<U, A> const& index,
requires_arch<avx512vl_128>) noexcept
{
return _mm_mmask_i64gather_pd(_mm_setzero_pd(), (__mmask8)0x3, index, src, sizeof(double));
}

// scatter
template <class A, class T,
class = std::enable_if_t<std::is_same<uint32_t, T>::value || std::is_same<int32_t, T>::value>>
XSIMD_INLINE void scatter(batch<T, A> const& src, T* dst,
batch<int32_t, A> const& index,
kernel::requires_arch<avx512vl_128>) noexcept
{
_mm_i32scatter_epi32(dst, index, src, sizeof(T));
}

template <class A, class T,
class = std::enable_if_t<std::is_same<uint64_t, T>::value || std::is_same<int64_t, T>::value>>
XSIMD_INLINE void scatter(batch<T, A> const& src, T* dst,
batch<int64_t, A> const& index,
kernel::requires_arch<avx512vl_128>) noexcept
{
_mm_i64scatter_epi64(dst, index, src, sizeof(T));
}

template <class A>
XSIMD_INLINE void scatter(batch<float, A> const& src, float* dst,
batch<int32_t, A> const& index,
kernel::requires_arch<avx512vl_128>) noexcept
{
_mm_i32scatter_ps(dst, index, src, sizeof(float));
}

template <class A>
XSIMD_INLINE void scatter(batch<double, A> const& src, double* dst,
batch<int64_t, A> const& index,
kernel::requires_arch<avx512vl_128>) noexcept
{
_mm_i64scatter_pd(dst, index, src, sizeof(double));
}

// max
template <class A>
XSIMD_INLINE batch<int64_t, A> max(batch<int64_t, A> const& self, batch<int64_t, A> const& other, requires_arch<avx512vl_128>) noexcept
Expand Down
66 changes: 66 additions & 0 deletions include/xsimd/arch/xsimd_avx512vl_256.hpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -334,6 +334,72 @@ namespace xsimd
detail::maskstore256(mem, src, mask.mask(), Mode {});
}

// gather
template <class T, class A, class U, detail::enable_sized_integral_t<T, 4> = 0, detail::enable_sized_integral_t<U, 4> = 0>
XSIMD_INLINE batch<T, A> gather(batch<T, A> const&, T const* src, batch<U, A> const& index,
kernel::requires_arch<avx512vl_256>) noexcept
{
return _mm256_mmask_i32gather_epi32(_mm256_setzero_si256(), (__mmask8)0xFF, index, static_cast<const void*>(src), sizeof(T));
}

template <class T, class A, class U, detail::enable_sized_integral_t<T, 8> = 0, detail::enable_sized_integral_t<U, 8> = 0>
XSIMD_INLINE batch<T, A> gather(batch<T, A> const&, T const* src, batch<U, A> const& index,
kernel::requires_arch<avx512vl_256>) noexcept
{
return _mm256_mmask_i64gather_epi64(_mm256_setzero_si256(), (__mmask8)0xF, index, static_cast<const void*>(src), sizeof(T));
}

template <class A, class U, detail::enable_sized_integral_t<U, 4> = 0>
XSIMD_INLINE batch<float, A> gather(batch<float, A> const&, float const* src,
batch<U, A> const& index,
kernel::requires_arch<avx512vl_256>) noexcept
{
return _mm256_mmask_i32gather_ps(_mm256_setzero_ps(), (__mmask8)0xFF, index, src, sizeof(float));
}

template <class A, class U, detail::enable_sized_integral_t<U, 8> = 0>
XSIMD_INLINE batch<double, A> gather(batch<double, A> const&, double const* src,
batch<U, A> const& index,
requires_arch<avx512vl_256>) noexcept
{
return _mm256_mmask_i64gather_pd(_mm256_setzero_pd(), (__mmask8)0xF, index, src, sizeof(double));
}

// scatter
template <class A, class T,
class = std::enable_if_t<std::is_same<uint32_t, T>::value || std::is_same<int32_t, T>::value>>
XSIMD_INLINE void scatter(batch<T, A> const& src, T* dst,
batch<int32_t, A> const& index,
kernel::requires_arch<avx512vl_256>) noexcept
{
_mm256_i32scatter_epi32(dst, index, src, sizeof(T));
}

template <class A, class T,
class = std::enable_if_t<std::is_same<uint64_t, T>::value || std::is_same<int64_t, T>::value>>
XSIMD_INLINE void scatter(batch<T, A> const& src, T* dst,
batch<int64_t, A> const& index,
kernel::requires_arch<avx512vl_256>) noexcept
{
_mm256_i64scatter_epi64(dst, index, src, sizeof(T));
}

template <class A>
XSIMD_INLINE void scatter(batch<float, A> const& src, float* dst,
batch<int32_t, A> const& index,
kernel::requires_arch<avx512vl_256>) noexcept
{
_mm256_i32scatter_ps(dst, index, src, sizeof(float));
}

template <class A>
XSIMD_INLINE void scatter(batch<double, A> const& src, double* dst,
batch<int64_t, A> const& index,
kernel::requires_arch<avx512vl_256>) noexcept
{
_mm256_i64scatter_pd(dst, index, src, sizeof(double));
}

// max
template <class A>
XSIMD_INLINE batch<int64_t, A> max(batch<int64_t, A> const& self, batch<int64_t, A> const& other, requires_arch<avx512vl_256>) noexcept
Expand Down
Loading