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cocos-engine-external/sources/enoki/array_kmask.h

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/*
enoki/array_kmask.h -- Abstraction around AVX512 'k' mask registers
Enoki is a C++ template library that enables transparent vectorization
of numerical kernels using ENOKI instruction sets available on current
processor architectures.
Copyright (c) 2019 Wenzel Jakob <wenzel.jakob@epfl.ch>
All rights reserved. Use of this source code is governed by a BSD-style
license that can be found in the LICENSE file.
*/
#pragma once
NAMESPACE_BEGIN(enoki)
/// SFINAE macro for constructors that reinterpret another type
#define ENOKI_REINTERPRET_KMASK(Value) \
template <typename Value2, typename Derived2, bool IsMask2, \
enable_if_t<detail::is_same_v<Value2, Value>> = 0> \
ENOKI_INLINE KMaskBase( \
const StaticArrayBase<Value2, Size, IsMask2, Derived2> &a, \
detail::reinterpret_flag)
#define ENOKI_REINTERPRET_KMASK_SIZE(Value, Size) \
template <typename Value2, typename Derived2, bool IsMask2, \
enable_if_t<detail::is_same_v<Value2, Value>> = 0> \
ENOKI_INLINE KMaskBase( \
const StaticArrayBase<Value2, Size, IsMask2, Derived2> &a, \
detail::reinterpret_flag)
template <typename Value_, size_t Size_> struct KMask;
template <typename Value_, size_t Size_, typename Derived_>
struct KMaskBase : StaticArrayBase<Value_, Size_, true, Derived_> {
using Register = std::conditional_t<(Size_ > 8), __mmask16, __mmask8>;
using Derived = Derived_;
using Base = StaticArrayBase<Value_, Size_, true, Derived_>;
using Base::Size;
using Base::derived;
static constexpr bool IsNative = true;
static constexpr bool IsKMask = true;
static constexpr Register BitMask = Register((1 << Size_) - 1);
ENOKI_ARRAY_DEFAULTS(KMaskBase)
#if defined(NDEBUG)
KMaskBase() = default;
#else
KMaskBase() : k(BitMask) { }
#endif
template <typename Array, enable_if_t<std::is_same_v<Register, typename Array::Derived::Register>> = 0>
ENOKI_INLINE KMaskBase(const Array &other, detail::reinterpret_flag) : k(other.derived().k) { }
template <typename T, enable_if_t<std::is_same_v<bool, T> || std::is_same_v<int, T>> = 0>
ENOKI_INLINE KMaskBase(const T &b, detail::reinterpret_flag)
: k(bool(b) ? BitMask : Register(0)) { }
ENOKI_REINTERPRET_KMASK(bool) {
__m128i value;
if constexpr (Size == 16)
value = _mm_loadu_si128((__m128i *) a.derived().data());
else if constexpr (Size == 8)
value = _mm_loadl_epi64((const __m128i *) a.derived().data());
else if constexpr (Size == 4 || Size == 3)
value = _mm_cvtsi32_si128(*((const int *) a.derived().data()));
else if constexpr (Size == 2)
value = _mm_cvtsi32_si128((int) *((const short *) a.derived().data()));
else
static_assert(detail::false_v<Value2>, "Unsupported number of elements");
#if defined(ENOKI_X86_AVX512VL) && defined(ENOKI_X86_AVX512BW)
k = (Register) _mm_test_epi8_mask(value, _mm_set1_epi8((char) 0xFF));
#else
k = (Register) _mm512_test_epi32_mask(_mm512_cvtepi8_epi32(value),
_mm512_set1_epi8((char) 0xFF));
#endif
}
#if !defined(ENOKI_X86_AVX512VL)
ENOKI_REINTERPRET_KMASK_SIZE(float, 8) : k((Register) _mm256_movemask_ps(a.derived().m)) { }
ENOKI_REINTERPRET_KMASK_SIZE(int32_t, 8) : k((Register) _mm256_movemask_ps(_mm256_castsi256_ps(a.derived().m))) { }
ENOKI_REINTERPRET_KMASK_SIZE(uint32_t, 8) : k((Register) _mm256_movemask_ps(_mm256_castsi256_ps(a.derived().m))) { }
#endif
ENOKI_REINTERPRET_KMASK_SIZE(double, 16) { k = _mm512_kunpackb(high(a).k, low(a).k); }
ENOKI_REINTERPRET_KMASK_SIZE(int64_t, 16) { k = _mm512_kunpackb(high(a).k, low(a).k); }
ENOKI_REINTERPRET_KMASK_SIZE(uint64_t, 16) { k = _mm512_kunpackb(high(a).k, low(a).k); }
template <typename T> ENOKI_INLINE static Derived from_k(const T &k) {
Derived result;
result.k = (Register) k;
return result;
}
ENOKI_INLINE Derived eq_(const Derived &a) const {
if constexpr (Size_ == 16) /* Use intrinsic if possible */
return Derived::from_k(_mm512_kxnor(k, a.k));
else
return Derived::from_k(~(k ^ a.k));
}
ENOKI_INLINE Derived neq_(const Derived &a) const {
if constexpr (Size_ == 16) /* Use intrinsic if possible */
return Derived::from_k(_mm512_kxor(k, a.k));
else
return Derived::from_k(k ^ a.k);
}
ENOKI_INLINE Derived or_(const Derived &a) const {
if constexpr (Size_ == 16) /* Use intrinsic if possible */
return Derived::from_k(_mm512_kor(k, a.k));
else
return Derived::from_k(k | a.k);
}
ENOKI_INLINE Derived and_(const Derived &a) const {
if constexpr (Size_ == 16) /* Use intrinsic if possible */
return Derived::from_k(_mm512_kand(k, a.k));
else
return Derived::from_k(k & a.k);
}
ENOKI_INLINE Derived andnot_(const Derived &a) const {
if constexpr (Size_ == 16) /* Use intrinsic if possible */
return Derived::from_k(_mm512_kandn(a.k, k));
else
return Derived::from_k(k & ~a.k);
}
ENOKI_INLINE Derived xor_(const Derived &a) const {
if constexpr (Size_ == 16) /* Use intrinsic if possible */
return Derived::from_k(_mm512_kxor(k, a.k));
else
return Derived::from_k(k ^ a.k);
}
ENOKI_INLINE Derived not_() const {
if constexpr (Size_ == 16)
return Derived::from_k(_mm512_knot(k));
else
return Derived::from_k(~k);
}
static ENOKI_INLINE Derived select_(const Derived &m, const Derived &t, const Derived &f) {
if constexpr (Size_ == 16)
return Derived::from_k(_mm512_kor(_mm512_kand (m.k, t.k),
_mm512_kandn(m.k, f.k)));
else
return Derived::from_k((m.k & t.k) | (~m.k & f.k));
}
ENOKI_INLINE bool all_() const {
if constexpr (Size_ == 16)
return _mm512_kortestc(k, k);
else if constexpr (Size_ == 8)
return k == BitMask;
else
return (k & BitMask) == BitMask;
}
ENOKI_INLINE bool any_() const {
if constexpr (Size_ == 16)
return !_mm512_kortestz(k, k);
else if constexpr (Size_ == 8)
return k != 0;
else
return (k & BitMask) != 0;
}
ENOKI_INLINE uint32_t bitmask_() const {
if constexpr (Size_ == 8 || Size_ == 16)
return (uint32_t) k;
else
return (uint32_t) (k & BitMask);
}
ENOKI_INLINE size_t count_() const {
return (size_t) _mm_popcnt_u32(bitmask_());
}
ENOKI_INLINE bool bit_(size_t i) const {
return (k & ((Register) 1 << i)) != 0;
}
ENOKI_INLINE void set_bit_(size_t i, bool value) {
k = (Register) (k ^ ((-value ^ k) & ((Register) 1 << i)));
}
ENOKI_INLINE auto coeff(size_t i) const {
return MaskBit<const Derived &>(derived(), i);
}
ENOKI_INLINE auto coeff(size_t i) {
return MaskBit<Derived &>(derived(), i);
}
static Derived zero_() { return Derived::from_k(0); }
template <typename Return = KMask<Value_, Size_ / 2>>
ENOKI_INLINE Return low_() const {
if constexpr (Size == 16)
return Return::from_k(__mmask8(k));
else
return Return::from_k(Return::BitMask & k);
}
template <typename Return = KMask<Value_, Size_ / 2>>
ENOKI_INLINE Return high_() const {
return Return::from_k(k >> (Size_ / 2));
}
ENOKI_INLINE void store_(void *ptr) const {
store_unaligned_(ptr);
}
ENOKI_INLINE void store_unaligned_(void *ptr) const {
memcpy(ptr, &k, sizeof(Register));
}
static ENOKI_INLINE Derived load_(const void *ptr) {
return load_unaligned_(ptr);
}
static ENOKI_INLINE Derived load_unaligned_(const void *ptr) {
Derived result;
memcpy(&result.k, ptr, sizeof(Register));
return result;
}
template <size_t Stride, typename Index, typename Mask>
static ENOKI_INLINE Derived gather_(const void *ptr, const Index &index_, const Mask &mask) {
using UInt32 = Array<uint32_t, Size>;
UInt32 index_32 = UInt32(index_),
index, offset;
if (Size == 2) {
index = sr<1>(index_32);
offset = Index(1) << (index_32 & (uint32_t) 0x1);
} else if (Size == 4) {
index = sr<2>(index_32);
offset = Index(1) << (index_32 & (uint32_t) 0x3);
} else {
index = sr<3>(index_32);
offset = Index(1) << (index_32 & (uint32_t) 0x7);
}
#if 0
const uint8_t *in = (const uint8_t *) ptr;
Register bit = 1, accum = 0;
for (size_t i = 0; i < Size; ++i) {
if ((bool) mask.coeff(i) && (in[index.coeff(i)] & offset.coeff(i)) != 0)
accum |= bit;
bit <<= 1;
}
return Derived::from_k(accum);
#else
return Derived(neq(gather<UInt32, 1>(ptr, index, mask) & offset, (uint32_t) 0));
#endif
}
template <typename Array, enable_if_t<std::is_same_v<Register, typename Array::Derived::Register>> = 0>
ENOKI_INLINE Derived& operator=(const Array &other) {
k = other.derived().k;
return derived();
}
template <typename T, enable_if_t<std::is_same_v<bool, T> || std::is_same_v<int, T>> = 0>
ENOKI_INLINE Derived& operator=(const T &b) {
k = bool(b) ? BitMask : Register(0);
return derived();
}
Register k;
};
template <typename Value_, size_t Size_>
struct KMask : KMaskBase<Value_, Size_, KMask<Value_, Size_>> {
using Base = KMaskBase<Value_, Size_, KMask<Value_, Size_>>;
ENOKI_ARRAY_IMPORT(Base, KMask)
};
#define ENOKI_DECLARE_KMASK(Type, Size, Derived, SFINAE) \
struct StaticArrayImpl<Type, Size, true, Derived, SFINAE> \
: KMaskBase<Type, Size, Derived> { \
using Base = KMaskBase<Type, Size, Derived>; \
ENOKI_ARRAY_DEFAULTS(StaticArrayImpl) \
using Base::Base; \
using Base::operator=; \
};
NAMESPACE_END(enoki)
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