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// Copyright 2019 Google LLC
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Single-element vectors and operations.
// External include guard in highway.h - see comment there.
#include <stdint.h>
#ifndef HWY_NO_LIBCXX
#include <math.h> // sqrtf
#endif
#include "hwy/ops/shared-inl.h"
HWY_BEFORE_NAMESPACE();
namespace hwy {
namespace HWY_NAMESPACE {
// Single instruction, single data.
template <typename T>
using Sisd = Simd<T, 1, 0>;
// (Wrapper class required for overloading comparison operators.)
template <typename T>
struct Vec1 {
using PrivateT = T; // only for DFromV
static constexpr size_t kPrivateN = 1; // only for DFromV
HWY_INLINE Vec1() = default;
Vec1(const Vec1&) = default;
Vec1& operator=(const Vec1&) = default;
HWY_INLINE explicit Vec1(const T t) : raw(t) {}
HWY_INLINE Vec1& operator*=(const Vec1 other) {
return *this = (*this * other);
}
HWY_INLINE Vec1& operator/=(const Vec1 other) {
return *this = (*this / other);
}
HWY_INLINE Vec1& operator+=(const Vec1 other) {
return *this = (*this + other);
}
HWY_INLINE Vec1& operator-=(const Vec1 other) {
return *this = (*this - other);
}
HWY_INLINE Vec1& operator%=(const Vec1 other) {
return *this = (*this % other);
}
HWY_INLINE Vec1& operator&=(const Vec1 other) {
return *this = (*this & other);
}
HWY_INLINE Vec1& operator|=(const Vec1 other) {
return *this = (*this | other);
}
HWY_INLINE Vec1& operator^=(const Vec1 other) {
return *this = (*this ^ other);
}
T raw;
};
// 0 or FF..FF, same size as Vec1.
template <typename T>
class Mask1 {
using Raw = hwy::MakeUnsigned<T>;
public:
static HWY_INLINE Mask1<T> FromBool(bool b) {
Mask1<T> mask;
mask.bits = b ? static_cast<Raw>(~Raw{0}) : 0;
return mask;
}
Raw bits;
};
template <class V>
using DFromV = Simd<typename V::PrivateT, V::kPrivateN, 0>;
template <class V>
using TFromV = typename V::PrivateT;
// ------------------------------ BitCast
template <class DTo, typename TTo = TFromD<DTo>, typename TFrom>
HWY_API Vec1<TTo> BitCast(DTo /* tag */, Vec1<TFrom> v) {
static_assert(sizeof(TTo) <= sizeof(TFrom), "Promoting is undefined");
TTo to;
CopyBytes<sizeof(TTo)>(&v.raw, &to); // not same size - ok to shrink
return Vec1<TTo>(to);
}
// ------------------------------ Zero
template <class D, HWY_IF_LANES_D(D, 1), typename T = TFromD<D>>
HWY_API Vec1<T> Zero(D /* tag */) {
return Vec1<T>(ConvertScalarTo<T>(0));
}
template <class D>
using VFromD = decltype(Zero(D()));
// ------------------------------ Tuple (VFromD)
#include "hwy/ops/tuple-inl.h"
// ------------------------------ Set
template <class D, HWY_IF_LANES_D(D, 1), typename T = TFromD<D>, typename T2>
HWY_API Vec1<T> Set(D /* tag */, const T2 t) {
return Vec1<T>(static_cast<T>(t));
}
// ------------------------------ Undefined
template <class D, HWY_IF_LANES_D(D, 1), typename T = TFromD<D>>
HWY_API Vec1<T> Undefined(D d) {
return Zero(d);
}
// ------------------------------ Iota
template <class D, HWY_IF_LANES_D(D, 1), typename T = TFromD<D>, typename T2>
HWY_API Vec1<T> Iota(const D /* tag */, const T2 first) {
return Vec1<T>(static_cast<T>(first));
}
// ------------------------------ ResizeBitCast
template <class D, typename FromV>
HWY_API VFromD<D> ResizeBitCast(D /* tag */, FromV v) {
using TFrom = TFromV<FromV>;
using TTo = TFromD<D>;
constexpr size_t kCopyLen = HWY_MIN(sizeof(TFrom), sizeof(TTo));
TTo to{};
CopyBytes<kCopyLen>(&v.raw, &to);
return VFromD<D>(to);
}
namespace detail {
// ResizeBitCast on the HWY_SCALAR target has zero-extending semantics if
// sizeof(TFromD<DTo>) is greater than sizeof(TFromV<FromV>)
template <class FromSizeTag, class ToSizeTag, class DTo, class DFrom>
HWY_INLINE VFromD<DTo> ZeroExtendResizeBitCast(FromSizeTag /* from_size_tag */,
ToSizeTag /* to_size_tag */,
DTo d_to, DFrom /*d_from*/,
VFromD<DFrom> v) {
return ResizeBitCast(d_to, v);
}
} // namespace detail
// ------------------------------ Dup128VecFromValues
template <class D, HWY_IF_T_SIZE_D(D, 1)>
HWY_API VFromD<D> Dup128VecFromValues(D /*d*/, TFromD<D> t0, TFromD<D> /*t1*/,
TFromD<D> /*t2*/, TFromD<D> /*t3*/,
TFromD<D> /*t4*/, TFromD<D> /*t5*/,
TFromD<D> /*t6*/, TFromD<D> /*t7*/,
TFromD<D> /*t8*/, TFromD<D> /*t9*/,
TFromD<D> /*t10*/, TFromD<D> /*t11*/,
TFromD<D> /*t12*/, TFromD<D> /*t13*/,
TFromD<D> /*t14*/, TFromD<D> /*t15*/) {
return VFromD<D>(t0);
}
template <class D, HWY_IF_T_SIZE_D(D, 2)>
HWY_API VFromD<D> Dup128VecFromValues(D /*d*/, TFromD<D> t0, TFromD<D> /*t1*/,
TFromD<D> /*t2*/, TFromD<D> /*t3*/,
TFromD<D> /*t4*/, TFromD<D> /*t5*/,
TFromD<D> /*t6*/, TFromD<D> /*t7*/) {
return VFromD<D>(t0);
}
template <class D, HWY_IF_T_SIZE_D(D, 4)>
HWY_API VFromD<D> Dup128VecFromValues(D /*d*/, TFromD<D> t0, TFromD<D> /*t1*/,
TFromD<D> /*t2*/, TFromD<D> /*t3*/) {
return VFromD<D>(t0);
}
template <class D, HWY_IF_T_SIZE_D(D, 8)>
HWY_API VFromD<D> Dup128VecFromValues(D /*d*/, TFromD<D> t0, TFromD<D> /*t1*/) {
return VFromD<D>(t0);
}
// ================================================== LOGICAL
// ------------------------------ Not
template <typename T>
HWY_API Vec1<T> Not(const Vec1<T> v) {
using TU = MakeUnsigned<T>;
const Sisd<TU> du;
return BitCast(Sisd<T>(), Vec1<TU>(static_cast<TU>(~BitCast(du, v).raw)));
}
// ------------------------------ And
template <typename T>
HWY_API Vec1<T> And(const Vec1<T> a, const Vec1<T> b) {
using TU = MakeUnsigned<T>;
const Sisd<TU> du;
return BitCast(Sisd<T>(), Vec1<TU>(BitCast(du, a).raw & BitCast(du, b).raw));
}
template <typename T>
HWY_API Vec1<T> operator&(const Vec1<T> a, const Vec1<T> b) {
return And(a, b);
}
// ------------------------------ AndNot
template <typename T>
HWY_API Vec1<T> AndNot(const Vec1<T> a, const Vec1<T> b) {
using TU = MakeUnsigned<T>;
const Sisd<TU> du;
return BitCast(Sisd<T>(), Vec1<TU>(static_cast<TU>(~BitCast(du, a).raw &
BitCast(du, b).raw)));
}
// ------------------------------ Or
template <typename T>
HWY_API Vec1<T> Or(const Vec1<T> a, const Vec1<T> b) {
using TU = MakeUnsigned<T>;
const Sisd<TU> du;
return BitCast(Sisd<T>(), Vec1<TU>(BitCast(du, a).raw | BitCast(du, b).raw));
}
template <typename T>
HWY_API Vec1<T> operator|(const Vec1<T> a, const Vec1<T> b) {
return Or(a, b);
}
// ------------------------------ Xor
template <typename T>
HWY_API Vec1<T> Xor(const Vec1<T> a, const Vec1<T> b) {
using TU = MakeUnsigned<T>;
const Sisd<TU> du;
return BitCast(Sisd<T>(), Vec1<TU>(BitCast(du, a).raw ^ BitCast(du, b).raw));
}
template <typename T>
HWY_API Vec1<T> operator^(const Vec1<T> a, const Vec1<T> b) {
return Xor(a, b);
}
// ------------------------------ Xor3
template <typename T>
HWY_API Vec1<T> Xor3(Vec1<T> x1, Vec1<T> x2, Vec1<T> x3) {
return Xor(x1, Xor(x2, x3));
}
// ------------------------------ Or3
template <typename T>
HWY_API Vec1<T> Or3(Vec1<T> o1, Vec1<T> o2, Vec1<T> o3) {
return Or(o1, Or(o2, o3));
}
// ------------------------------ OrAnd
template <typename T>
HWY_API Vec1<T> OrAnd(const Vec1<T> o, const Vec1<T> a1, const Vec1<T> a2) {
return Or(o, And(a1, a2));
}
// ------------------------------ Mask
template <class DTo, typename TTo = TFromD<DTo>, typename TFrom>
HWY_API Mask1<TTo> RebindMask(DTo /*tag*/, Mask1<TFrom> m) {
static_assert(sizeof(TFrom) == sizeof(TTo), "Must have same size");
return Mask1<TTo>{m.bits};
}
// v must be 0 or FF..FF.
template <typename T>
HWY_API Mask1<T> MaskFromVec(const Vec1<T> v) {
Mask1<T> mask;
CopySameSize(&v, &mask);
return mask;
}
template <class D>
using MFromD = decltype(MaskFromVec(VFromD<D>()));
template <typename T>
Vec1<T> VecFromMask(const Mask1<T> mask) {
Vec1<T> v;
CopySameSize(&mask, &v);
return v;
}
template <class D, typename T = TFromD<D>>
Vec1<T> VecFromMask(D /* tag */, const Mask1<T> mask) {
Vec1<T> v;
CopySameSize(&mask, &v);
return v;
}
template <class D, HWY_IF_LANES_D(D, 1), typename T = TFromD<D>>
HWY_API Mask1<T> FirstN(D /*tag*/, size_t n) {
return Mask1<T>::FromBool(n != 0);
}
// ------------------------------ IfVecThenElse
template <typename T>
HWY_API Vec1<T> IfVecThenElse(Vec1<T> mask, Vec1<T> yes, Vec1<T> no) {
return IfThenElse(MaskFromVec(mask), yes, no);
}
// ------------------------------ CopySign
template <typename T>
HWY_API Vec1<T> CopySign(const Vec1<T> magn, const Vec1<T> sign) {
static_assert(IsFloat<T>(), "Only makes sense for floating-point");
const DFromV<decltype(magn)> d;
return BitwiseIfThenElse(SignBit(d), sign, magn);
}
// ------------------------------ CopySignToAbs
template <typename T>
HWY_API Vec1<T> CopySignToAbs(const Vec1<T> abs, const Vec1<T> sign) {
static_assert(IsFloat<T>(), "Only makes sense for floating-point");
const Sisd<T> d;
return OrAnd(abs, SignBit(d), sign);
}
// ------------------------------ BroadcastSignBit
template <typename T>
HWY_API Vec1<T> BroadcastSignBit(const Vec1<T> v) {
// This is used inside ShiftRight, so we cannot implement in terms of it.
return v.raw < 0 ? Vec1<T>(T(-1)) : Vec1<T>(0);
}
// ------------------------------ PopulationCount
#ifdef HWY_NATIVE_POPCNT
#undef HWY_NATIVE_POPCNT
#else
#define HWY_NATIVE_POPCNT
#endif
template <typename T>
HWY_API Vec1<T> PopulationCount(Vec1<T> v) {
return Vec1<T>(static_cast<T>(PopCount(v.raw)));
}
// ------------------------------ IfThenElse
// Returns mask ? yes : no.
template <typename T>
HWY_API Vec1<T> IfThenElse(const Mask1<T> mask, const Vec1<T> yes,
const Vec1<T> no) {
return mask.bits ? yes : no;
}
template <typename T>
HWY_API Vec1<T> IfThenElseZero(const Mask1<T> mask, const Vec1<T> yes) {
return mask.bits ? yes : Vec1<T>(ConvertScalarTo<T>(0));
}
template <typename T>
HWY_API Vec1<T> IfThenZeroElse(const Mask1<T> mask, const Vec1<T> no) {
return mask.bits ? Vec1<T>(ConvertScalarTo<T>(0)) : no;
}
template <typename T>
HWY_API Vec1<T> IfNegativeThenElse(Vec1<T> v, Vec1<T> yes, Vec1<T> no) {
const DFromV<decltype(v)> d;
const RebindToSigned<decltype(d)> di;
const auto vi = BitCast(di, v);
return vi.raw < 0 ? yes : no;
}
template <typename T>
HWY_API Vec1<T> ZeroIfNegative(const Vec1<T> v) {
const DFromV<decltype(v)> d;
const RebindToSigned<decltype(d)> di;
const auto vi = BitCast(di, v);
return vi.raw < 0 ? Vec1<T>(ConvertScalarTo<T>(0)) : v;
}
// ------------------------------ Mask logical
template <typename T>
HWY_API Mask1<T> Not(const Mask1<T> m) {
return MaskFromVec(Not(VecFromMask(Sisd<T>(), m)));
}
template <typename T>
HWY_API Mask1<T> And(const Mask1<T> a, Mask1<T> b) {
const Sisd<T> d;
return MaskFromVec(And(VecFromMask(d, a), VecFromMask(d, b)));
}
template <typename T>
HWY_API Mask1<T> AndNot(const Mask1<T> a, Mask1<T> b) {
const Sisd<T> d;
return MaskFromVec(AndNot(VecFromMask(d, a), VecFromMask(d, b)));
}
template <typename T>
HWY_API Mask1<T> Or(const Mask1<T> a, Mask1<T> b) {
const Sisd<T> d;
return MaskFromVec(Or(VecFromMask(d, a), VecFromMask(d, b)));
}
template <typename T>
HWY_API Mask1<T> Xor(const Mask1<T> a, Mask1<T> b) {
const Sisd<T> d;
return MaskFromVec(Xor(VecFromMask(d, a), VecFromMask(d, b)));
}
template <typename T>
HWY_API Mask1<T> ExclusiveNeither(const Mask1<T> a, Mask1<T> b) {
const Sisd<T> d;
return MaskFromVec(AndNot(VecFromMask(d, a), Not(VecFromMask(d, b))));
}
template <class T>
HWY_API Mask1<T> SetAtOrAfterFirst(Mask1<T> mask) {
return mask;
}
template <class T>
HWY_API Mask1<T> SetBeforeFirst(Mask1<T> mask) {
return Not(mask);
}
template <class T>
HWY_API Mask1<T> SetOnlyFirst(Mask1<T> mask) {
return mask;
}
template <class T>
HWY_API Mask1<T> SetAtOrBeforeFirst(Mask1<T> /*mask*/) {
return Mask1<T>::FromBool(true);
}
// ------------------------------ LowerHalfOfMask
#ifdef HWY_NATIVE_LOWER_HALF_OF_MASK
#undef HWY_NATIVE_LOWER_HALF_OF_MASK
#else
#define HWY_NATIVE_LOWER_HALF_OF_MASK
#endif
template <class D>
HWY_API MFromD<D> LowerHalfOfMask(D /*d*/, MFromD<D> m) {
return m;
}
// ================================================== SHIFTS
// ------------------------------ ShiftLeft/ShiftRight (BroadcastSignBit)
template <int kBits, typename T>
HWY_API Vec1<T> ShiftLeft(const Vec1<T> v) {
static_assert(0 <= kBits && kBits < sizeof(T) * 8, "Invalid shift");
return Vec1<T>(
static_cast<T>(static_cast<hwy::MakeUnsigned<T>>(v.raw) << kBits));
}
template <int kBits, typename T>
HWY_API Vec1<T> ShiftRight(const Vec1<T> v) {
static_assert(0 <= kBits && kBits < sizeof(T) * 8, "Invalid shift");
#if __cplusplus >= 202002L
// Signed right shift is now guaranteed to be arithmetic (rounding toward
// negative infinity, i.e. shifting in the sign bit).
return Vec1<T>(static_cast<T>(v.raw >> kBits));
#else
if (IsSigned<T>()) {
// Emulate arithmetic shift using only logical (unsigned) shifts, because
// signed shifts are still implementation-defined.
using TU = hwy::MakeUnsigned<T>;
const Sisd<TU> du;
const TU shifted = static_cast<TU>(BitCast(du, v).raw >> kBits);
const TU sign = BitCast(du, BroadcastSignBit(v)).raw;
const size_t sign_shift =
static_cast<size_t>(static_cast<int>(sizeof(TU)) * 8 - 1 - kBits);
const TU upper = static_cast<TU>(sign << sign_shift);
return BitCast(Sisd<T>(), Vec1<TU>(shifted | upper));
} else { // T is unsigned
return Vec1<T>(static_cast<T>(v.raw >> kBits));
}
#endif
}
// ------------------------------ RotateRight (ShiftRight)
template <int kBits, typename T>
HWY_API Vec1<T> RotateRight(const Vec1<T> v) {
constexpr size_t kSizeInBits = sizeof(T) * 8;
static_assert(0 <= kBits && kBits < kSizeInBits, "Invalid shift");
if (kBits == 0) return v;
return Or(ShiftRight<kBits>(v),
ShiftLeft<HWY_MIN(kSizeInBits - 1, kSizeInBits - kBits)>(v));
}
// ------------------------------ ShiftLeftSame (BroadcastSignBit)
template <typename T>
HWY_API Vec1<T> ShiftLeftSame(const Vec1<T> v, int bits) {
return Vec1<T>(
static_cast<T>(static_cast<hwy::MakeUnsigned<T>>(v.raw) << bits));
}
template <typename T>
HWY_API Vec1<T> ShiftRightSame(const Vec1<T> v, int bits) {
#if __cplusplus >= 202002L
// Signed right shift is now guaranteed to be arithmetic (rounding toward
// negative infinity, i.e. shifting in the sign bit).
return Vec1<T>(static_cast<T>(v.raw >> bits));
#else
if (IsSigned<T>()) {
// Emulate arithmetic shift using only logical (unsigned) shifts, because
// signed shifts are still implementation-defined.
using TU = hwy::MakeUnsigned<T>;
const Sisd<TU> du;
const TU shifted = static_cast<TU>(BitCast(du, v).raw >> bits);
const TU sign = BitCast(du, BroadcastSignBit(v)).raw;
const size_t sign_shift =
static_cast<size_t>(static_cast<int>(sizeof(TU)) * 8 - 1 - bits);
const TU upper = static_cast<TU>(sign << sign_shift);
return BitCast(Sisd<T>(), Vec1<TU>(shifted | upper));
} else { // T is unsigned
return Vec1<T>(static_cast<T>(v.raw >> bits));
}
#endif
}
// ------------------------------ Shl
// Single-lane => same as ShiftLeftSame except for the argument type.
template <typename T>
HWY_API Vec1<T> operator<<(const Vec1<T> v, const Vec1<T> bits) {
return ShiftLeftSame(v, static_cast<int>(bits.raw));
}
template <typename T>
HWY_API Vec1<T> operator>>(const Vec1<T> v, const Vec1<T> bits) {
return ShiftRightSame(v, static_cast<int>(bits.raw));
}
// ================================================== ARITHMETIC
template <typename T>
HWY_API Vec1<T> operator+(Vec1<T> a, Vec1<T> b) {
const uint64_t a64 = static_cast<uint64_t>(a.raw);
const uint64_t b64 = static_cast<uint64_t>(b.raw);
return Vec1<T>(static_cast<T>((a64 + b64) & static_cast<uint64_t>(~T(0))));
}
HWY_API Vec1<float> operator+(const Vec1<float> a, const Vec1<float> b) {
return Vec1<float>(a.raw + b.raw);
}
HWY_API Vec1<double> operator+(const Vec1<double> a, const Vec1<double> b) {
return Vec1<double>(a.raw + b.raw);
}
template <typename T>
HWY_API Vec1<T> operator-(Vec1<T> a, Vec1<T> b) {
const uint64_t a64 = static_cast<uint64_t>(a.raw);
const uint64_t b64 = static_cast<uint64_t>(b.raw);
return Vec1<T>(static_cast<T>((a64 - b64) & static_cast<uint64_t>(~T(0))));
}
HWY_API Vec1<float> operator-(const Vec1<float> a, const Vec1<float> b) {
return Vec1<float>(a.raw - b.raw);
}
HWY_API Vec1<double> operator-(const Vec1<double> a, const Vec1<double> b) {
return Vec1<double>(a.raw - b.raw);
}
// ------------------------------ SumsOf8
HWY_API Vec1<int64_t> SumsOf8(const Vec1<int8_t> v) {
return Vec1<int64_t>(v.raw);
}
HWY_API Vec1<uint64_t> SumsOf8(const Vec1<uint8_t> v) {
return Vec1<uint64_t>(v.raw);
}
// ------------------------------ SumsOf2
template <class T>
HWY_API Vec1<MakeWide<T>> SumsOf2(const Vec1<T> v) {
const DFromV<decltype(v)> d;
const Rebind<MakeWide<T>, decltype(d)> dw;
return PromoteTo(dw, v);
}
// ------------------------------ SaturatedAdd
// Returns a + b clamped to the destination range.
// Unsigned
HWY_API Vec1<uint8_t> SaturatedAdd(const Vec1<uint8_t> a,
const Vec1<uint8_t> b) {
return Vec1<uint8_t>(
static_cast<uint8_t>(HWY_MIN(HWY_MAX(0, a.raw + b.raw), 255)));
}
HWY_API Vec1<uint16_t> SaturatedAdd(const Vec1<uint16_t> a,
const Vec1<uint16_t> b) {
return Vec1<uint16_t>(static_cast<uint16_t>(
HWY_MIN(HWY_MAX(0, static_cast<int32_t>(a.raw) + b.raw), 65535)));
}
// Signed
HWY_API Vec1<int8_t> SaturatedAdd(const Vec1<int8_t> a, const Vec1<int8_t> b) {
return Vec1<int8_t>(
static_cast<int8_t>(HWY_MIN(HWY_MAX(-128, a.raw + b.raw), 127)));
}
HWY_API Vec1<int16_t> SaturatedAdd(const Vec1<int16_t> a,
const Vec1<int16_t> b) {
return Vec1<int16_t>(static_cast<int16_t>(
HWY_MIN(HWY_MAX(-32768, static_cast<int32_t>(a.raw) + b.raw), 32767)));
}
// ------------------------------ Saturating subtraction
// Returns a - b clamped to the destination range.
// Unsigned
HWY_API Vec1<uint8_t> SaturatedSub(const Vec1<uint8_t> a,
const Vec1<uint8_t> b) {
return Vec1<uint8_t>(
static_cast<uint8_t>(HWY_MIN(HWY_MAX(0, a.raw - b.raw), 255)));
}
HWY_API Vec1<uint16_t> SaturatedSub(const Vec1<uint16_t> a,
const Vec1<uint16_t> b) {
return Vec1<uint16_t>(static_cast<uint16_t>(
HWY_MIN(HWY_MAX(0, static_cast<int32_t>(a.raw) - b.raw), 65535)));
}
// Signed
HWY_API Vec1<int8_t> SaturatedSub(const Vec1<int8_t> a, const Vec1<int8_t> b) {
return Vec1<int8_t>(
static_cast<int8_t>(HWY_MIN(HWY_MAX(-128, a.raw - b.raw), 127)));
}
HWY_API Vec1<int16_t> SaturatedSub(const Vec1<int16_t> a,
const Vec1<int16_t> b) {
return Vec1<int16_t>(static_cast<int16_t>(
HWY_MIN(HWY_MAX(-32768, static_cast<int32_t>(a.raw) - b.raw), 32767)));
}
// ------------------------------ Average
// Returns (a + b + 1) / 2
HWY_API Vec1<uint8_t> AverageRound(const Vec1<uint8_t> a,
const Vec1<uint8_t> b) {
return Vec1<uint8_t>(static_cast<uint8_t>((a.raw + b.raw + 1) / 2));
}
HWY_API Vec1<uint16_t> AverageRound(const Vec1<uint16_t> a,
const Vec1<uint16_t> b) {
return Vec1<uint16_t>(static_cast<uint16_t>((a.raw + b.raw + 1) / 2));
}
// ------------------------------ Absolute value
template <typename T>
HWY_API Vec1<T> Abs(const Vec1<T> a) {
return Vec1<T>(ScalarAbs(a.raw));
}
// ------------------------------ Min/Max
// <cmath> may be unavailable, so implement our own.
template <typename T, HWY_IF_NOT_FLOAT(T)>
HWY_API Vec1<T> Min(const Vec1<T> a, const Vec1<T> b) {
return Vec1<T>(HWY_MIN(a.raw, b.raw));
}
template <typename T, HWY_IF_FLOAT(T)>
HWY_API Vec1<T> Min(const Vec1<T> a, const Vec1<T> b) {
if (isnan(a.raw)) return b;
if (isnan(b.raw)) return a;
return Vec1<T>(HWY_MIN(a.raw, b.raw));
}
template <typename T, HWY_IF_NOT_FLOAT(T)>
HWY_API Vec1<T> Max(const Vec1<T> a, const Vec1<T> b) {
return Vec1<T>(HWY_MAX(a.raw, b.raw));
}
template <typename T, HWY_IF_FLOAT(T)>
HWY_API Vec1<T> Max(const Vec1<T> a, const Vec1<T> b) {
if (isnan(a.raw)) return b;
if (isnan(b.raw)) return a;
return Vec1<T>(HWY_MAX(a.raw, b.raw));
}
// ------------------------------ Floating-point negate
template <typename T, HWY_IF_FLOAT_OR_SPECIAL(T)>
HWY_API Vec1<T> Neg(const Vec1<T> v) {
return Xor(v, SignBit(Sisd<T>()));
}
template <typename T, HWY_IF_NOT_FLOAT_NOR_SPECIAL(T)>
HWY_API Vec1<T> Neg(const Vec1<T> v) {
return Zero(Sisd<T>()) - v;
}
// ------------------------------ mul/div
// Per-target flags to prevent generic_ops-inl.h defining 8/64-bit operator*.
#ifdef HWY_NATIVE_MUL_8
#undef HWY_NATIVE_MUL_8
#else
#define HWY_NATIVE_MUL_8
#endif
#ifdef HWY_NATIVE_MUL_64
#undef HWY_NATIVE_MUL_64
#else
#define HWY_NATIVE_MUL_64
#endif
template <typename T, HWY_IF_FLOAT(T)>
HWY_API Vec1<T> operator*(const Vec1<T> a, const Vec1<T> b) {
return Vec1<T>(static_cast<T>(double{a.raw} * b.raw));
}
template <typename T, HWY_IF_NOT_FLOAT(T)>
HWY_API Vec1<T> operator*(const Vec1<T> a, const Vec1<T> b) {
return Vec1<T>(static_cast<T>(static_cast<uint64_t>(a.raw) *
static_cast<uint64_t>(b.raw)));
}
template <typename T, HWY_IF_FLOAT(T)>
HWY_API Vec1<T> operator/(const Vec1<T> a, const Vec1<T> b) {
return Vec1<T>(a.raw / b.raw);
}
// Returns the upper 16 bits of a * b in each lane.
HWY_API Vec1<int16_t> MulHigh(const Vec1<int16_t> a, const Vec1<int16_t> b) {
return Vec1<int16_t>(static_cast<int16_t>((a.raw * b.raw) >> 16));
}
HWY_API Vec1<uint16_t> MulHigh(const Vec1<uint16_t> a, const Vec1<uint16_t> b) {
// Cast to uint32_t first to prevent overflow. Otherwise the result of
// uint16_t * uint16_t is in "int" which may overflow. In practice the result
// is the same but this way it is also defined.
return Vec1<uint16_t>(static_cast<uint16_t>(
(static_cast<uint32_t>(a.raw) * static_cast<uint32_t>(b.raw)) >> 16));
}
HWY_API Vec1<int16_t> MulFixedPoint15(Vec1<int16_t> a, Vec1<int16_t> b) {
return Vec1<int16_t>(static_cast<int16_t>((a.raw * b.raw + 16384) >> 15));
}
// Multiplies even lanes (0, 2 ..) and returns the double-wide result.
template <class T, HWY_IF_T_SIZE_ONE_OF(T, (1 << 1) | (1 << 2) | (1 << 4)),
HWY_IF_NOT_FLOAT_NOR_SPECIAL(T)>
HWY_API Vec1<MakeWide<T>> MulEven(const Vec1<T> a, const Vec1<T> b) {
using TW = MakeWide<T>;
const TW a_wide = a.raw;
return Vec1<TW>(static_cast<TW>(a_wide * b.raw));
}
// Approximate reciprocal
HWY_API Vec1<float> ApproximateReciprocal(const Vec1<float> v) {
// Zero inputs are allowed, but callers are responsible for replacing the
// return value with something else (typically using IfThenElse). This check
// avoids a ubsan error. The return value is arbitrary.
if (v.raw == 0.0f) return Vec1<float>(0.0f);
return Vec1<float>(1.0f / v.raw);
}
// generic_ops takes care of integer T.
template <typename T, HWY_IF_FLOAT(T)>
HWY_API Vec1<T> AbsDiff(const Vec1<T> a, const Vec1<T> b) {
return Abs(a - b);
}
// ------------------------------ Floating-point multiply-add variants
template <typename T, HWY_IF_FLOAT(T)>
HWY_API Vec1<T> MulAdd(const Vec1<T> mul, const Vec1<T> x, const Vec1<T> add) {
return mul * x + add;
}
template <typename T, HWY_IF_FLOAT(T)>
HWY_API Vec1<T> NegMulAdd(const Vec1<T> mul, const Vec1<T> x,
const Vec1<T> add) {
return add - mul * x;
}
template <typename T, HWY_IF_FLOAT(T)>
HWY_API Vec1<T> MulSub(const Vec1<T> mul, const Vec1<T> x, const Vec1<T> sub) {
return mul * x - sub;
}
template <typename T, HWY_IF_FLOAT(T)>
HWY_API Vec1<T> NegMulSub(const Vec1<T> mul, const Vec1<T> x,
const Vec1<T> sub) {
return Neg(mul) * x - sub;
}
// ------------------------------ Floating-point square root
// Approximate reciprocal square root
HWY_API Vec1<float> ApproximateReciprocalSqrt(const Vec1<float> v) {
float f = v.raw;
const float half = f * 0.5f;
uint32_t bits;
CopySameSize(&f, &bits);
// Initial guess based on log2(f)
bits = 0x5F3759DF - (bits >> 1);
CopySameSize(&bits, &f);
// One Newton-Raphson iteration
return Vec1<float>(f * (1.5f - (half * f * f)));
}
// Square root
HWY_API Vec1<float> Sqrt(Vec1<float> v) {
#if defined(HWY_NO_LIBCXX)
#if HWY_COMPILER_GCC_ACTUAL
return Vec1<float>(__builtin_sqrt(v.raw));
#else
uint32_t bits;
CopyBytes<sizeof(bits)>(&v, &bits);
// Coarse approximation, letting the exponent LSB leak into the mantissa
bits = (1 << 29) + (bits >> 1) - (1 << 22);
CopyBytes<sizeof(bits)>(&bits, &v);
return v;
#endif // !HWY_COMPILER_GCC_ACTUAL
#else
return Vec1<float>(sqrtf(v.raw));
#endif // !HWY_NO_LIBCXX
}
HWY_API Vec1<double> Sqrt(Vec1<double> v) {
#if defined(HWY_NO_LIBCXX)
#if HWY_COMPILER_GCC_ACTUAL
return Vec1<double>(__builtin_sqrt(v.raw));
#else
uint64_t bits;
CopyBytes<sizeof(bits)>(&v, &bits);
// Coarse approximation, letting the exponent LSB leak into the mantissa
bits = (1ULL << 61) + (bits >> 1) - (1ULL << 51);
CopyBytes<sizeof(bits)>(&bits, &v);
return v;
#endif // !HWY_COMPILER_GCC_ACTUAL
#else
return Vec1<double>(sqrt(v.raw));
#endif // HWY_NO_LIBCXX
}
// ------------------------------ Floating-point rounding
template <typename T>
HWY_API Vec1<T> Round(const Vec1<T> v) {
using TI = MakeSigned<T>;
if (!(Abs(v).raw < MantissaEnd<T>())) { // Huge or NaN
return v;
}
const T k0 = ConvertScalarTo<T>(0);
const T bias = ConvertScalarTo<T>(v.raw < k0 ? -0.5 : 0.5);
const TI rounded = ConvertScalarTo<TI>(v.raw + bias);
if (rounded == 0) return CopySignToAbs(Vec1<T>(k0), v);
TI offset = 0;
// Round to even
if ((rounded & 1) && ScalarAbs(ConvertScalarTo<T>(rounded) - v.raw) ==
ConvertScalarTo<T>(0.5)) {
offset = v.raw < k0 ? -1 : 1;
}
return Vec1<T>(ConvertScalarTo<T>(rounded - offset));
}
// Round-to-nearest even.
HWY_API Vec1<int32_t> NearestInt(const Vec1<float> v) {
using T = float;
using TI = int32_t;
const T abs = Abs(v).raw;
const bool is_sign = ScalarSignBit(v.raw);
if (!(abs < MantissaEnd<T>())) { // Huge or NaN
// Check if too large to cast or NaN
if (!(abs <= ConvertScalarTo<T>(LimitsMax<TI>()))) {
return Vec1<TI>(is_sign ? LimitsMin<TI>() : LimitsMax<TI>());
}
return Vec1<int32_t>(ConvertScalarTo<TI>(v.raw));
}
const T bias =
ConvertScalarTo<T>(v.raw < ConvertScalarTo<T>(0.0) ? -0.5 : 0.5);
const TI rounded = ConvertScalarTo<TI>(v.raw + bias);
if (rounded == 0) return Vec1<int32_t>(0);
TI offset = 0;
// Round to even
if ((rounded & 1) && ScalarAbs(ConvertScalarTo<T>(rounded) - v.raw) ==
ConvertScalarTo<T>(0.5)) {
offset = is_sign ? -1 : 1;
}
return Vec1<TI>(rounded - offset);
}
template <typename T>
HWY_API Vec1<T> Trunc(const Vec1<T> v) {
using TI = MakeSigned<T>;
if (!(Abs(v).raw <= MantissaEnd<T>())) { // Huge or NaN
return v;
}
const TI truncated = ConvertScalarTo<TI>(v.raw);
if (truncated == 0) return CopySignToAbs(Vec1<T>(0), v);
return Vec1<T>(ConvertScalarTo<T>(truncated));
}
template <typename Float, typename Bits, int kMantissaBits, int kExponentBits,
class V>
V Ceiling(const V v) {
const Bits kExponentMask = (1ull << kExponentBits) - 1;
const Bits kMantissaMask = (1ull << kMantissaBits) - 1;
const Bits kBias = kExponentMask / 2;
Float f = v.raw;
const bool positive = f > Float(0.0);
Bits bits;
CopySameSize(&v, &bits);
const int exponent =
static_cast<int>(((bits >> kMantissaBits) & kExponentMask) - kBias);
// Already an integer.
if (exponent >= kMantissaBits) return v;
// |v| <= 1 => 0 or 1.
if (exponent < 0) return positive ? V(1) : V(-0.0);
const Bits mantissa_mask = kMantissaMask >> exponent;
// Already an integer
if ((bits & mantissa_mask) == 0) return v;
// Clear fractional bits and round up
if (positive) bits += (kMantissaMask + 1) >> exponent;
bits &= ~mantissa_mask;
CopySameSize(&bits, &f);
return V(f);
}
template <typename Float, typename Bits, int kMantissaBits, int kExponentBits,
class V>
V Floor(const V v) {
const Bits kExponentMask = (1ull << kExponentBits) - 1;
const Bits kMantissaMask = (1ull << kMantissaBits) - 1;
const Bits kBias = kExponentMask / 2;
Float f = v.raw;
const bool negative = f < Float(0.0);
Bits bits;
CopySameSize(&v, &bits);
const int exponent =
static_cast<int>(((bits >> kMantissaBits) & kExponentMask) - kBias);
// Already an integer.
if (exponent >= kMantissaBits) return v;
// |v| <= 1 => -1 or 0.
if (exponent < 0) return V(negative ? Float(-1.0) : Float(0.0));
const Bits mantissa_mask = kMantissaMask >> exponent;
// Already an integer
if ((bits & mantissa_mask) == 0) return v;
// Clear fractional bits and round down
if (negative) bits += (kMantissaMask + 1) >> exponent;
bits &= ~mantissa_mask;
CopySameSize(&bits, &f);
return V(f);
}
// Toward +infinity, aka ceiling
HWY_API Vec1<float> Ceil(const Vec1<float> v) {
return Ceiling<float, uint32_t, 23, 8>(v);
}
HWY_API Vec1<double> Ceil(const Vec1<double> v) {
return Ceiling<double, uint64_t, 52, 11>(v);
}
// Toward -infinity, aka floor
HWY_API Vec1<float> Floor(const Vec1<float> v) {
return Floor<float, uint32_t, 23, 8>(v);
}
HWY_API Vec1<double> Floor(const Vec1<double> v) {
return Floor<double, uint64_t, 52, 11>(v);
}
// ================================================== COMPARE
template <typename T>
HWY_API Mask1<T> operator==(const Vec1<T> a, const Vec1<T> b) {
return Mask1<T>::FromBool(a.raw == b.raw);
}
template <typename T>
HWY_API Mask1<T> operator!=(const Vec1<T> a, const Vec1<T> b) {
return Mask1<T>::FromBool(a.raw != b.raw);
}
template <typename T>
HWY_API Mask1<T> TestBit(const Vec1<T> v, const Vec1<T> bit) {
static_assert(!hwy::IsFloat<T>(), "Only integer vectors supported");
return (v & bit) == bit;
}
template <typename T>
HWY_API Mask1<T> operator<(const Vec1<T> a, const Vec1<T> b) {
return Mask1<T>::FromBool(a.raw < b.raw);
}
template <typename T>
HWY_API Mask1<T> operator>(const Vec1<T> a, const Vec1<T> b) {
return Mask1<T>::FromBool(a.raw > b.raw);
}
template <typename T>
HWY_API Mask1<T> operator<=(const Vec1<T> a, const Vec1<T> b) {
return Mask1<T>::FromBool(a.raw <= b.raw);
}
template <typename T>
HWY_API Mask1<T> operator>=(const Vec1<T> a, const Vec1<T> b) {
return Mask1<T>::FromBool(a.raw >= b.raw);
}
// ------------------------------ Floating-point classification (==)
template <typename T>
HWY_API Mask1<T> IsNaN(const Vec1<T> v) {
// std::isnan returns false for 0x7F..FF in clang AVX3 builds, so DIY.
MakeUnsigned<T> bits;
CopySameSize(&v, &bits);
bits += bits;
bits >>= 1; // clear sign bit
// NaN if all exponent bits are set and the mantissa is not zero.
return Mask1<T>::FromBool(bits > ExponentMask<T>());
}
// Per-target flag to prevent generic_ops-inl.h from defining IsInf / IsFinite.
#ifdef HWY_NATIVE_ISINF
#undef HWY_NATIVE_ISINF
#else
#define HWY_NATIVE_ISINF
#endif
HWY_API Mask1<float> IsInf(const Vec1<float> v) {
const Sisd<float> d;
const RebindToUnsigned<decltype(d)> du;
const Vec1<uint32_t> vu = BitCast(du, v);
// 'Shift left' to clear the sign bit, check for exponent=max and mantissa=0.
return RebindMask(d, (vu + vu) == Set(du, 0xFF000000u));
}
HWY_API Mask1<double> IsInf(const Vec1<double> v) {
const Sisd<double> d;
const RebindToUnsigned<decltype(d)> du;
const Vec1<uint64_t> vu = BitCast(du, v);
// 'Shift left' to clear the sign bit, check for exponent=max and mantissa=0.
return RebindMask(d, (vu + vu) == Set(du, 0xFFE0000000000000ull));
}
HWY_API Mask1<float> IsFinite(const Vec1<float> v) {
const Vec1<uint32_t> vu = BitCast(Sisd<uint32_t>(), v);
// Shift left to clear the sign bit, check whether exponent != max value.
return Mask1<float>::FromBool((vu.raw << 1) < 0xFF000000u);
}
HWY_API Mask1<double> IsFinite(const Vec1<double> v) {
const Vec1<uint64_t> vu = BitCast(Sisd<uint64_t>(), v);
// Shift left to clear the sign bit, check whether exponent != max value.
return Mask1<double>::FromBool((vu.raw << 1) < 0xFFE0000000000000ull);
}
// ================================================== MEMORY
// ------------------------------ Load
template <class D, HWY_IF_LANES_D(D, 1), typename T = TFromD<D>>
HWY_API Vec1<T> Load(D /* tag */, const T* HWY_RESTRICT aligned) {
T t;
CopySameSize(aligned, &t);
return Vec1<T>(t);
}
template <class D, typename T = TFromD<D>>
HWY_API Vec1<T> MaskedLoad(Mask1<T> m, D d, const T* HWY_RESTRICT aligned) {
return IfThenElseZero(m, Load(d, aligned));
}
template <class D, typename T = TFromD<D>>
HWY_API Vec1<T> MaskedLoadOr(Vec1<T> v, Mask1<T> m, D d,
const T* HWY_RESTRICT aligned) {
return IfThenElse(m, Load(d, aligned), v);
}
template <class D, HWY_IF_LANES_D(D, 1), typename T = TFromD<D>>
HWY_API Vec1<T> LoadU(D d, const T* HWY_RESTRICT p) {
return Load(d, p);
}
// In some use cases, "load single lane" is sufficient; otherwise avoid this.
template <class D, HWY_IF_LANES_D(D, 1), typename T = TFromD<D>>
HWY_API Vec1<T> LoadDup128(D d, const T* HWY_RESTRICT aligned) {
return Load(d, aligned);
}
#ifdef HWY_NATIVE_LOAD_N
#undef HWY_NATIVE_LOAD_N
#else
#define HWY_NATIVE_LOAD_N
#endif
template <class D, typename T = TFromD<D>>
HWY_API VFromD<D> LoadN(D d, const T* HWY_RESTRICT p,
size_t max_lanes_to_load) {
return (max_lanes_to_load > 0) ? Load(d, p) : Zero(d);
}
template <class D, typename T = TFromD<D>>
HWY_API VFromD<D> LoadNOr(VFromD<D> no, D d, const T* HWY_RESTRICT p,
size_t max_lanes_to_load) {
return (max_lanes_to_load > 0) ? Load(d, p) : no;
}
// ------------------------------ Store
template <class D, typename T = TFromD<D>>
HWY_API void Store(const Vec1<T> v, D /* tag */, T* HWY_RESTRICT aligned) {
CopySameSize(&v.raw, aligned);
}
template <class D, typename T = TFromD<D>>
HWY_API void StoreU(const Vec1<T> v, D d, T* HWY_RESTRICT p) {
return Store(v, d, p);
}
template <class D, typename T = TFromD<D>>
HWY_API void BlendedStore(const Vec1<T> v, Mask1<T> m, D d, T* HWY_RESTRICT p) {
if (!m.bits) return;
StoreU(v, d, p);
}
#ifdef HWY_NATIVE_STORE_N
#undef HWY_NATIVE_STORE_N
#else
#define HWY_NATIVE_STORE_N
#endif
template <class D, typename T = TFromD<D>>
HWY_API void StoreN(VFromD<D> v, D d, T* HWY_RESTRICT p,
size_t max_lanes_to_store) {
if (max_lanes_to_store > 0) {
Store(v, d, p);
}
}
// ------------------------------ LoadInterleaved2/3/4
// Per-target flag to prevent generic_ops-inl.h from defining StoreInterleaved2.
#ifdef HWY_NATIVE_LOAD_STORE_INTERLEAVED
#undef HWY_NATIVE_LOAD_STORE_INTERLEAVED
#else
#define HWY_NATIVE_LOAD_STORE_INTERLEAVED
#endif
template <class D, typename T = TFromD<D>>
HWY_API void LoadInterleaved2(D d, const T* HWY_RESTRICT unaligned, Vec1<T>& v0,
Vec1<T>& v1) {
v0 = LoadU(d, unaligned + 0);
v1 = LoadU(d, unaligned + 1);
}
template <class D, typename T = TFromD<D>>
HWY_API void LoadInterleaved3(D d, const T* HWY_RESTRICT unaligned, Vec1<T>& v0,
Vec1<T>& v1, Vec1<T>& v2) {
v0 = LoadU(d, unaligned + 0);
v1 = LoadU(d, unaligned + 1);
v2 = LoadU(d, unaligned + 2);
}
template <class D, typename T = TFromD<D>>
HWY_API void LoadInterleaved4(D d, const T* HWY_RESTRICT unaligned, Vec1<T>& v0,
Vec1<T>& v1, Vec1<T>& v2, Vec1<T>& v3) {
v0 = LoadU(d, unaligned + 0);
v1 = LoadU(d, unaligned + 1);
v2 = LoadU(d, unaligned + 2);
v3 = LoadU(d, unaligned + 3);
}
// ------------------------------ StoreInterleaved2/3/4
template <class D, typename T = TFromD<D>>
HWY_API void StoreInterleaved2(const Vec1<T> v0, const Vec1<T> v1, D d,
T* HWY_RESTRICT unaligned) {
StoreU(v0, d, unaligned + 0);
StoreU(v1, d, unaligned + 1);
}
template <class D, typename T = TFromD<D>>
HWY_API void StoreInterleaved3(const Vec1<T> v0, const Vec1<T> v1,
const Vec1<T> v2, D d,
T* HWY_RESTRICT unaligned) {
StoreU(v0, d, unaligned + 0);
StoreU(v1, d, unaligned + 1);
StoreU(v2, d, unaligned + 2);
}
template <class D, typename T = TFromD<D>>
HWY_API void StoreInterleaved4(const Vec1<T> v0, const Vec1<T> v1,
const Vec1<T> v2, const Vec1<T> v3, D d,
T* HWY_RESTRICT unaligned) {
StoreU(v0, d, unaligned + 0);
StoreU(v1, d, unaligned + 1);
StoreU(v2, d, unaligned + 2);
StoreU(v3, d, unaligned + 3);
}
// ------------------------------ Stream
template <class D, typename T = TFromD<D>>
HWY_API void Stream(const Vec1<T> v, D d, T* HWY_RESTRICT aligned) {
return Store(v, d, aligned);
}
// ------------------------------ Scatter
#ifdef HWY_NATIVE_SCATTER
#undef HWY_NATIVE_SCATTER
#else
#define HWY_NATIVE_SCATTER
#endif
template <class D, typename T = TFromD<D>, typename TI>
HWY_API void ScatterOffset(Vec1<T> v, D d, T* base, Vec1<TI> offset) {
static_assert(sizeof(T) == sizeof(TI), "Index/lane size must match");
const intptr_t addr =
reinterpret_cast<intptr_t>(base) + static_cast<intptr_t>(offset.raw);
Store(v, d, reinterpret_cast<T*>(addr));
}
template <class D, typename T = TFromD<D>, typename TI>
HWY_API void ScatterIndex(Vec1<T> v, D d, T* HWY_RESTRICT base,
Vec1<TI> index) {
static_assert(sizeof(T) == sizeof(TI), "Index/lane size must match");
Store(v, d, base + index.raw);
}
template <class D, typename T = TFromD<D>, typename TI>
HWY_API void MaskedScatterIndex(Vec1<T> v, Mask1<T> m, D d,
T* HWY_RESTRICT base, Vec1<TI> index) {
static_assert(sizeof(T) == sizeof(TI), "Index/lane size must match");
if (m.bits) Store(v, d, base + index.raw);
}
// ------------------------------ Gather
#ifdef HWY_NATIVE_GATHER
#undef HWY_NATIVE_GATHER
#else
#define HWY_NATIVE_GATHER
#endif
template <class D, typename T = TFromD<D>>
HWY_API Vec1<T> GatherOffset(D d, const T* base, Vec1<MakeSigned<T>> offset) {
HWY_DASSERT(offset.raw >= 0);
const intptr_t addr =
reinterpret_cast<intptr_t>(base) + static_cast<intptr_t>(offset.raw);
return Load(d, reinterpret_cast<const T*>(addr));
}
template <class D, typename T = TFromD<D>>
HWY_API Vec1<T> GatherIndex(D d, const T* HWY_RESTRICT base,
Vec1<MakeSigned<T>> index) {
HWY_DASSERT(index.raw >= 0);
return Load(d, base + index.raw);
}
template <class D, typename T = TFromD<D>>
HWY_API Vec1<T> MaskedGatherIndex(Mask1<T> m, D d, const T* HWY_RESTRICT base,
Vec1<MakeSigned<T>> index) {
HWY_DASSERT(index.raw >= 0);
return MaskedLoad(m, d, base + index.raw);
}
template <class D, typename T = TFromD<D>>
HWY_API Vec1<T> MaskedGatherIndexOr(Vec1<T> no, Mask1<T> m, D d,
const T* HWY_RESTRICT base,
Vec1<MakeSigned<T>> index) {
HWY_DASSERT(index.raw >= 0);
return MaskedLoadOr(no, m, d, base + index.raw);
}
// ================================================== CONVERT
// ConvertTo and DemoteTo with floating-point input and integer output truncate
// (rounding toward zero).
namespace detail {
template <class ToT, class FromT>
HWY_INLINE ToT CastValueForF2IConv(FromT val) {
// Prevent ubsan errors when converting float to narrower integer
using FromTU = MakeUnsigned<FromT>;
using ToTU = MakeUnsigned<ToT>;
constexpr unsigned kMaxExpField =
static_cast<unsigned>(MaxExponentField<FromT>());
constexpr unsigned kExpBias = kMaxExpField >> 1;
constexpr unsigned kMinOutOfRangeExpField = static_cast<unsigned>(HWY_MIN(
kExpBias + sizeof(ToT) * 8 - static_cast<unsigned>(IsSigned<ToT>()),
kMaxExpField));
// If ToT is signed, compare only the exponent bits of val against
// kMinOutOfRangeExpField.
//
// Otherwise, if ToT is unsigned, compare the sign bit plus exponent bits of
// val against kMinOutOfRangeExpField as a negative value is outside of the
// range of an unsigned integer type.
const FromT val_to_compare =
static_cast<FromT>(IsSigned<ToT>() ? ScalarAbs(val) : val);
// val is within the range of ToT if
// (BitCastScalar<FromTU>(val_to_compare) >> MantissaBits<FromT>()) is less
// than kMinOutOfRangeExpField
//
// Otherwise, val is either outside of the range of ToT or equal to
// LimitsMin<ToT>() if
// (BitCastScalar<FromTU>(val_to_compare) >> MantissaBits<FromT>()) is greater
// than or equal to kMinOutOfRangeExpField.
return (static_cast<unsigned>(BitCastScalar<FromTU>(val_to_compare) >>
MantissaBits<FromT>()) < kMinOutOfRangeExpField)
? static_cast<ToT>(val)
: static_cast<ToT>(static_cast<ToTU>(LimitsMax<ToT>()) +
static_cast<ToTU>(ScalarSignBit(val)));
}
template <class ToT, class ToTypeTag, class FromT>
HWY_INLINE ToT CastValueForPromoteTo(ToTypeTag /* to_type_tag */, FromT val) {
return ConvertScalarTo<ToT>(val);
}
template <class ToT>
HWY_INLINE ToT CastValueForPromoteTo(hwy::SignedTag /*to_type_tag*/,
float val) {
return CastValueForF2IConv<ToT>(val);
}
template <class ToT>
HWY_INLINE ToT CastValueForPromoteTo(hwy::UnsignedTag /*to_type_tag*/,
float val) {
return CastValueForF2IConv<ToT>(val);
}
} // namespace detail
#ifdef HWY_NATIVE_PROMOTE_F16_TO_F64
#undef HWY_NATIVE_PROMOTE_F16_TO_F64
#else
#define HWY_NATIVE_PROMOTE_F16_TO_F64
#endif
template <class DTo, typename TTo = TFromD<DTo>, typename TFrom>
HWY_API Vec1<TTo> PromoteTo(DTo /* tag */, Vec1<TFrom> from) {
static_assert(sizeof(TTo) > sizeof(TFrom), "Not promoting");
// For bits Y > X, floatX->floatY and intX->intY are always representable.
return Vec1<TTo>(
detail::CastValueForPromoteTo<TTo>(hwy::TypeTag<TTo>(), from.raw));
}
// MSVC 19.10 cannot deduce the argument type if HWY_IF_FLOAT(TFrom) is here,
// so we overload for TFrom=double and TTo={float,int32_t}.
template <class D, HWY_IF_F32_D(D)>
HWY_API Vec1<float> DemoteTo(D /* tag */, Vec1<double> from) {
// Prevent ubsan errors when converting float to narrower integer/float
if (IsInf(from).bits ||
Abs(from).raw > static_cast<double>(HighestValue<float>())) {
return Vec1<float>(ScalarSignBit(from.raw) ? LowestValue<float>()
: HighestValue<float>());
}
return Vec1<float>(static_cast<float>(from.raw));
}
template <class D, HWY_IF_UI32_D(D)>
HWY_API VFromD<D> DemoteTo(D /* tag */, Vec1<double> from) {
// Prevent ubsan errors when converting int32_t to narrower integer/int32_t
return Vec1<TFromD<D>>(detail::CastValueForF2IConv<TFromD<D>>(from.raw));
}
template <class DTo, typename TTo = TFromD<DTo>, typename TFrom,
HWY_IF_SIGNED(TFrom), HWY_IF_NOT_FLOAT_NOR_SPECIAL(TFromD<DTo>)>
HWY_API Vec1<TTo> DemoteTo(DTo /* tag */, Vec1<TFrom> from) {
static_assert(!IsFloat<TFrom>(), "TFrom=double are handled above");
static_assert(sizeof(TTo) < sizeof(TFrom), "Not demoting");
// Int to int: choose closest value in TTo to `from` (avoids UB)
from.raw = HWY_MIN(HWY_MAX(LimitsMin<TTo>(), from.raw), LimitsMax<TTo>());
return Vec1<TTo>(static_cast<TTo>(from.raw));
}
template <class DTo, typename TTo = TFromD<DTo>, typename TFrom,
HWY_IF_UNSIGNED(TFrom), HWY_IF_UNSIGNED_D(DTo)>
HWY_API Vec1<TTo> DemoteTo(DTo /* tag */, Vec1<TFrom> from) {
static_assert(!IsFloat<TFrom>(), "TFrom=double are handled above");
static_assert(sizeof(TTo) < sizeof(TFrom), "Not demoting");
// Int to int: choose closest value in TTo to `from` (avoids UB)
from.raw = HWY_MIN(from.raw, LimitsMax<TTo>());
return Vec1<TTo>(static_cast<TTo>(from.raw));
}
template <class DTo, typename TTo = TFromD<DTo>, typename TFrom,
HWY_IF_UI64(TFrom), HWY_IF_F32_D(DTo)>
HWY_API Vec1<TTo> DemoteTo(DTo /* tag */, Vec1<TFrom> from) {
// int64_t/uint64_t to float: simply cast to TTo
return Vec1<TTo>(static_cast<TTo>(from.raw));
}
// Per-target flag to prevent generic_ops-inl.h from defining f16 conversions;
// use this scalar version to verify the vector implementation.
#ifdef HWY_NATIVE_F16C
#undef HWY_NATIVE_F16C
#else
#define HWY_NATIVE_F16C
#endif
template <class D, HWY_IF_F32_D(D)>
HWY_API Vec1<float> PromoteTo(D /* tag */, const Vec1<float16_t> v) {
return Vec1<float>(F32FromF16(v.raw));
}
template <class D, HWY_IF_F32_D(D)>
HWY_API Vec1<float> PromoteTo(D d, const Vec1<bfloat16_t> v) {
return Set(d, F32FromBF16(v.raw));
}
template <class DTo, typename TFrom>
HWY_API VFromD<DTo> PromoteEvenTo(DTo d_to, Vec1<TFrom> v) {
return PromoteTo(d_to, v);
}
template <class D, HWY_IF_F16_D(D)>
HWY_API Vec1<float16_t> DemoteTo(D /* tag */, const Vec1<float> v) {
return Vec1<float16_t>(F16FromF32(v.raw));
}
template <class D, HWY_IF_BF16_D(D)>
HWY_API Vec1<bfloat16_t> DemoteTo(D d, const Vec1<float> v) {
return Set(d, BF16FromF32(v.raw));
}
template <class DTo, typename TTo = TFromD<DTo>, typename TFrom,
HWY_IF_FLOAT(TFrom)>
HWY_API Vec1<TTo> ConvertTo(DTo /* tag */, Vec1<TFrom> from) {
static_assert(sizeof(TTo) == sizeof(TFrom), "Should have same size");
// float## -> int##: return closest representable value.
return Vec1<TTo>(detail::CastValueForF2IConv<TTo>(from.raw));
}
template <class DTo, typename TTo = TFromD<DTo>, typename TFrom,
HWY_IF_NOT_FLOAT(TFrom)>
HWY_API Vec1<TTo> ConvertTo(DTo /* tag */, Vec1<TFrom> from) {
static_assert(sizeof(TTo) == sizeof(TFrom), "Should have same size");
// int## -> float##: no check needed
return Vec1<TTo>(static_cast<TTo>(from.raw));
}
HWY_API Vec1<uint8_t> U8FromU32(const Vec1<uint32_t> v) {
return DemoteTo(Sisd<uint8_t>(), v);
}
// ------------------------------ TruncateTo
template <class D, HWY_IF_U8_D(D)>
HWY_API Vec1<uint8_t> TruncateTo(D /* tag */, Vec1<uint64_t> v) {
return Vec1<uint8_t>{static_cast<uint8_t>(v.raw & 0xFF)};
}
template <class D, HWY_IF_U16_D(D)>
HWY_API Vec1<uint16_t> TruncateTo(D /* tag */, Vec1<uint64_t> v) {
return Vec1<uint16_t>{static_cast<uint16_t>(v.raw & 0xFFFF)};
}
template <class D, HWY_IF_U32_D(D)>
HWY_API Vec1<uint32_t> TruncateTo(D /* tag */, Vec1<uint64_t> v) {
return Vec1<uint32_t>{static_cast<uint32_t>(v.raw & 0xFFFFFFFFu)};
}
template <class D, HWY_IF_U8_D(D)>
HWY_API Vec1<uint8_t> TruncateTo(D /* tag */, Vec1<uint32_t> v) {
return Vec1<uint8_t>{static_cast<uint8_t>(v.raw & 0xFF)};
}
template <class D, HWY_IF_U16_D(D)>
HWY_API Vec1<uint16_t> TruncateTo(D /* tag */, Vec1<uint32_t> v) {
return Vec1<uint16_t>{static_cast<uint16_t>(v.raw & 0xFFFF)};
}
template <class D, HWY_IF_U8_D(D)>
HWY_API Vec1<uint8_t> TruncateTo(D /* tag */, Vec1<uint16_t> v) {
return Vec1<uint8_t>{static_cast<uint8_t>(v.raw & 0xFF)};
}
// ================================================== COMBINE
// UpperHalf, ZeroExtendVector, Combine, Concat* are unsupported.
template <typename T>
HWY_API Vec1<T> LowerHalf(Vec1<T> v) {
return v;
}
template <class D, typename T = TFromD<D>>
HWY_API Vec1<T> LowerHalf(D /* tag */, Vec1<T> v) {
return v;
}
// ================================================== SWIZZLE
template <typename T>
HWY_API T GetLane(const Vec1<T> v) {
return v.raw;
}
template <typename T>
HWY_API T ExtractLane(const Vec1<T> v, size_t i) {
HWY_DASSERT(i == 0);
(void)i;
return v.raw;
}
template <typename T>
HWY_API Vec1<T> InsertLane(Vec1<T> v, size_t i, T t) {
HWY_DASSERT(i == 0);
(void)i;
v.raw = t;
return v;
}
template <typename T>
HWY_API Vec1<T> DupEven(Vec1<T> v) {
return v;
}
// DupOdd is unsupported.
template <typename T>
HWY_API Vec1<T> OddEven(Vec1<T> /* odd */, Vec1<T> even) {
return even;
}
template <typename T>
HWY_API Vec1<T> OddEvenBlocks(Vec1<T> /* odd */, Vec1<T> even) {
return even;
}
// ------------------------------ SwapAdjacentBlocks
template <typename T>
HWY_API Vec1<T> SwapAdjacentBlocks(Vec1<T> v) {
return v;
}
// ------------------------------ TableLookupLanes
// Returned by SetTableIndices for use by TableLookupLanes.
template <typename T>
struct Indices1 {
MakeSigned<T> raw;
};
template <class D, typename T = TFromD<D>, typename TI>
HWY_API Indices1<T> IndicesFromVec(D, Vec1<TI> vec) {
static_assert(sizeof(T) == sizeof(TI), "Index size must match lane size");
HWY_DASSERT(vec.raw <= 1);
return Indices1<T>{static_cast<MakeSigned<T>>(vec.raw)};
}
template <class D, HWY_IF_LANES_D(D, 1), typename T = TFromD<D>, typename TI>
HWY_API Indices1<T> SetTableIndices(D d, const TI* idx) {
return IndicesFromVec(d, LoadU(Sisd<TI>(), idx));
}
template <typename T>
HWY_API Vec1<T> TableLookupLanes(const Vec1<T> v, const Indices1<T> /* idx */) {
return v;
}
template <typename T>
HWY_API Vec1<T> TwoTablesLookupLanes(const Vec1<T> a, const Vec1<T> b,
const Indices1<T> idx) {
return (idx.raw == 0) ? a : b;
}
// ------------------------------ ReverseBlocks
// Single block: no change
template <class D, typename T = TFromD<D>>
HWY_API Vec1<T> ReverseBlocks(D /* tag */, const Vec1<T> v) {
return v;
}
// ------------------------------ Reverse
template <class D, typename T = TFromD<D>>
HWY_API Vec1<T> Reverse(D /* tag */, const Vec1<T> v) {
return v;
}
// Per-target flag to prevent generic_ops-inl.h defining 8-bit Reverse2/4/8.
#ifdef HWY_NATIVE_REVERSE2_8
#undef HWY_NATIVE_REVERSE2_8
#else
#define HWY_NATIVE_REVERSE2_8
#endif
// Must not be called:
template <class D, typename T = TFromD<D>>
HWY_API Vec1<T> Reverse2(D /* tag */, const Vec1<T> v) {
return v;
}
template <class D, typename T = TFromD<D>>
HWY_API Vec1<T> Reverse4(D /* tag */, const Vec1<T> v) {
return v;
}
template <class D, typename T = TFromD<D>>
HWY_API Vec1<T> Reverse8(D /* tag */, const Vec1<T> v) {
return v;
}
// ------------------------------ ReverseLaneBytes
#ifdef HWY_NATIVE_REVERSE_LANE_BYTES
#undef HWY_NATIVE_REVERSE_LANE_BYTES
#else
#define HWY_NATIVE_REVERSE_LANE_BYTES
#endif
HWY_API Vec1<uint16_t> ReverseLaneBytes(Vec1<uint16_t> v) {
const uint32_t val{v.raw};
return Vec1<uint16_t>(
static_cast<uint16_t>(((val << 8) & 0xFF00u) | ((val >> 8) & 0x00FFu)));
}
HWY_API Vec1<uint32_t> ReverseLaneBytes(Vec1<uint32_t> v) {
const uint32_t val = v.raw;
return Vec1<uint32_t>(static_cast<uint32_t>(
((val << 24) & 0xFF000000u) | ((val << 8) & 0x00FF0000u) |
((val >> 8) & 0x0000FF00u) | ((val >> 24) & 0x000000FFu)));
}
HWY_API Vec1<uint64_t> ReverseLaneBytes(Vec1<uint64_t> v) {
const uint64_t val = v.raw;
return Vec1<uint64_t>(static_cast<uint64_t>(
((val << 56) & 0xFF00000000000000u) |
((val << 40) & 0x00FF000000000000u) |
((val << 24) & 0x0000FF0000000000u) | ((val << 8) & 0x000000FF00000000u) |
((val >> 8) & 0x00000000FF000000u) | ((val >> 24) & 0x0000000000FF0000u) |
((val >> 40) & 0x000000000000FF00u) |
((val >> 56) & 0x00000000000000FFu)));
}
template <class V, HWY_IF_SIGNED_V(V),
HWY_IF_T_SIZE_ONE_OF_V(V, (1 << 2) | (1 << 4) | (1 << 8))>
HWY_API V ReverseLaneBytes(V v) {
const DFromV<decltype(v)> d;
const RebindToUnsigned<decltype(d)> du;
return BitCast(d, ReverseLaneBytes(BitCast(du, v)));
}
// ------------------------------ ReverseBits
#ifdef HWY_NATIVE_REVERSE_BITS_UI8
#undef HWY_NATIVE_REVERSE_BITS_UI8
#else
#define HWY_NATIVE_REVERSE_BITS_UI8
#endif
#ifdef HWY_NATIVE_REVERSE_BITS_UI16_32_64
#undef HWY_NATIVE_REVERSE_BITS_UI16_32_64
#else
#define HWY_NATIVE_REVERSE_BITS_UI16_32_64
#endif
namespace detail {
template <class T>
HWY_INLINE T ReverseBitsOfEachByte(T val) {
using TU = MakeUnsigned<T>;
constexpr TU kMaxUnsignedVal{LimitsMax<TU>()};
constexpr TU kShrMask1 =
static_cast<TU>(0x5555555555555555u & kMaxUnsignedVal);
constexpr TU kShrMask2 =
static_cast<TU>(0x3333333333333333u & kMaxUnsignedVal);
constexpr TU kShrMask3 =
static_cast<TU>(0x0F0F0F0F0F0F0F0Fu & kMaxUnsignedVal);
constexpr TU kShlMask1 = static_cast<TU>(~kShrMask1);
constexpr TU kShlMask2 = static_cast<TU>(~kShrMask2);
constexpr TU kShlMask3 = static_cast<TU>(~kShrMask3);
TU result = static_cast<TU>(val);
result = static_cast<TU>(((result << 1) & kShlMask1) |
((result >> 1) & kShrMask1));
result = static_cast<TU>(((result << 2) & kShlMask2) |
((result >> 2) & kShrMask2));
result = static_cast<TU>(((result << 4) & kShlMask3) |
((result >> 4) & kShrMask3));
return static_cast<T>(result);
}
} // namespace detail
template <class V, HWY_IF_UNSIGNED_V(V), HWY_IF_T_SIZE_V(V, 1)>
HWY_API V ReverseBits(V v) {
return V(detail::ReverseBitsOfEachByte(v.raw));
}
template <class V, HWY_IF_UNSIGNED_V(V),
HWY_IF_T_SIZE_ONE_OF_V(V, (1 << 2) | (1 << 4) | (1 << 8))>
HWY_API V ReverseBits(V v) {
return ReverseLaneBytes(V(detail::ReverseBitsOfEachByte(v.raw)));
}
template <class V, HWY_IF_SIGNED_V(V)>
HWY_API V ReverseBits(V v) {
const DFromV<decltype(v)> d;
const RebindToUnsigned<decltype(d)> du;
return BitCast(d, ReverseBits(BitCast(du, v)));
}
// ------------------------------ SlideUpLanes
template <typename D>
HWY_API VFromD<D> SlideUpLanes(D /*d*/, VFromD<D> v, size_t /*amt*/) {
return v;
}
// ------------------------------ SlideDownLanes
template <typename D>
HWY_API VFromD<D> SlideDownLanes(D /*d*/, VFromD<D> v, size_t /*amt*/) {
return v;
}
// ================================================== BLOCKWISE
// Shift*Bytes, CombineShiftRightBytes, Interleave*, Shuffle* are unsupported.
// ------------------------------ Broadcast/splat any lane
template <int kLane, typename T>
HWY_API Vec1<T> Broadcast(const Vec1<T> v) {
static_assert(kLane == 0, "Scalar only has one lane");
return v;
}
// ------------------------------ TableLookupBytes, TableLookupBytesOr0
template <typename T, typename TI>
HWY_API Vec1<TI> TableLookupBytes(const Vec1<T> in, const Vec1<TI> indices) {
uint8_t in_bytes[sizeof(T)];
uint8_t idx_bytes[sizeof(T)];
uint8_t out_bytes[sizeof(T)];
CopyBytes<sizeof(T)>(&in, &in_bytes); // copy to bytes
CopyBytes<sizeof(T)>(&indices, &idx_bytes);
for (size_t i = 0; i < sizeof(T); ++i) {
out_bytes[i] = in_bytes[idx_bytes[i]];
}
TI out;
CopyBytes<sizeof(TI)>(&out_bytes, &out);
return Vec1<TI>{out};
}
template <typename T, typename TI>
HWY_API Vec1<TI> TableLookupBytesOr0(const Vec1<T> in, const Vec1<TI> indices) {
uint8_t in_bytes[sizeof(T)];
uint8_t idx_bytes[sizeof(T)];
uint8_t out_bytes[sizeof(T)];
CopyBytes<sizeof(T)>(&in, &in_bytes); // copy to bytes
CopyBytes<sizeof(T)>(&indices, &idx_bytes);
for (size_t i = 0; i < sizeof(T); ++i) {
out_bytes[i] = idx_bytes[i] & 0x80 ? 0 : in_bytes[idx_bytes[i]];
}
TI out;
CopyBytes<sizeof(TI)>(&out_bytes, &out);
return Vec1<TI>{out};
}
// ------------------------------ ZipLower
HWY_API Vec1<uint16_t> ZipLower(Vec1<uint8_t> a, Vec1<uint8_t> b) {
return Vec1<uint16_t>(static_cast<uint16_t>((uint32_t{b.raw} << 8) + a.raw));
}
HWY_API Vec1<uint32_t> ZipLower(Vec1<uint16_t> a, Vec1<uint16_t> b) {
return Vec1<uint32_t>((uint32_t{b.raw} << 16) + a.raw);
}
HWY_API Vec1<uint64_t> ZipLower(Vec1<uint32_t> a, Vec1<uint32_t> b) {
return Vec1<uint64_t>((uint64_t{b.raw} << 32) + a.raw);
}
HWY_API Vec1<int16_t> ZipLower(Vec1<int8_t> a, Vec1<int8_t> b) {
return Vec1<int16_t>(static_cast<int16_t>((int32_t{b.raw} << 8) + a.raw));
}
HWY_API Vec1<int32_t> ZipLower(Vec1<int16_t> a, Vec1<int16_t> b) {
return Vec1<int32_t>((int32_t{b.raw} << 16) + a.raw);
}
HWY_API Vec1<int64_t> ZipLower(Vec1<int32_t> a, Vec1<int32_t> b) {
return Vec1<int64_t>((int64_t{b.raw} << 32) + a.raw);
}
template <class DW, typename TW = TFromD<DW>, typename TN = MakeNarrow<TW>>
HWY_API Vec1<TW> ZipLower(DW /* tag */, Vec1<TN> a, Vec1<TN> b) {
return Vec1<TW>(static_cast<TW>((TW{b.raw} << (sizeof(TN) * 8)) + a.raw));
}
// ================================================== MASK
template <class D, typename T = TFromD<D>>
HWY_API bool AllFalse(D /* tag */, const Mask1<T> mask) {
return mask.bits == 0;
}
template <class D, typename T = TFromD<D>>
HWY_API bool AllTrue(D /* tag */, const Mask1<T> mask) {
return mask.bits != 0;
}
// `p` points to at least 8 readable bytes, not all of which need be valid.
template <class D, HWY_IF_LANES_D(D, 1), typename T = TFromD<D>>
HWY_API Mask1<T> LoadMaskBits(D /* tag */, const uint8_t* HWY_RESTRICT bits) {
return Mask1<T>::FromBool((bits[0] & 1) != 0);
}
template <class D, HWY_IF_LANES_D(D, 1)>
HWY_API MFromD<D> Dup128MaskFromMaskBits(D /*d*/, unsigned mask_bits) {
return MFromD<D>::FromBool((mask_bits & 1) != 0);
}
// `p` points to at least 8 writable bytes.
template <class D, typename T = TFromD<D>>
HWY_API size_t StoreMaskBits(D d, const Mask1<T> mask, uint8_t* bits) {
*bits = AllTrue(d, mask);
return 1;
}
template <class D, typename T = TFromD<D>>
HWY_API size_t CountTrue(D /* tag */, const Mask1<T> mask) {
return mask.bits == 0 ? 0 : 1;
}
template <class D, typename T = TFromD<D>>
HWY_API intptr_t FindFirstTrue(D /* tag */, const Mask1<T> mask) {
return mask.bits == 0 ? -1 : 0;
}
template <class D, typename T = TFromD<D>>
HWY_API size_t FindKnownFirstTrue(D /* tag */, const Mask1<T> /* m */) {
return 0; // There is only one lane and we know it is true.
}
template <class D, typename T = TFromD<D>>
HWY_API intptr_t FindLastTrue(D /* tag */, const Mask1<T> mask) {
return mask.bits == 0 ? -1 : 0;
}
template <class D, typename T = TFromD<D>>
HWY_API size_t FindKnownLastTrue(D /* tag */, const Mask1<T> /* m */) {
return 0; // There is only one lane and we know it is true.
}
// ------------------------------ Compress, CompressBits
template <typename T>
struct CompressIsPartition {
enum { value = 1 };
};
template <typename T>
HWY_API Vec1<T> Compress(Vec1<T> v, const Mask1<T> /* mask */) {
// A single lane is already partitioned by definition.
return v;
}
template <typename T>
HWY_API Vec1<T> CompressNot(Vec1<T> v, const Mask1<T> /* mask */) {
// A single lane is already partitioned by definition.
return v;
}
// ------------------------------ CompressStore
template <class D, typename T = TFromD<D>>
HWY_API size_t CompressStore(Vec1<T> v, const Mask1<T> mask, D d,
T* HWY_RESTRICT unaligned) {
StoreU(Compress(v, mask), d, unaligned);
return CountTrue(d, mask);
}
// ------------------------------ CompressBlendedStore
template <class D, typename T = TFromD<D>>
HWY_API size_t CompressBlendedStore(Vec1<T> v, const Mask1<T> mask, D d,
T* HWY_RESTRICT unaligned) {
if (!mask.bits) return 0;
StoreU(v, d, unaligned);
return 1;
}
// ------------------------------ CompressBits
template <typename T>
HWY_API Vec1<T> CompressBits(Vec1<T> v, const uint8_t* HWY_RESTRICT /*bits*/) {
return v;
}
// ------------------------------ CompressBitsStore
template <class D, typename T = TFromD<D>>
HWY_API size_t CompressBitsStore(Vec1<T> v, const uint8_t* HWY_RESTRICT bits,
D d, T* HWY_RESTRICT unaligned) {
const Mask1<T> mask = LoadMaskBits(d, bits);
StoreU(Compress(v, mask), d, unaligned);
return CountTrue(d, mask);
}
// ------------------------------ Expand
// generic_ops-inl.h requires Vec64/128, so implement [Load]Expand here.
#ifdef HWY_NATIVE_EXPAND
#undef HWY_NATIVE_EXPAND
#else
#define HWY_NATIVE_EXPAND
#endif
template <typename T>
HWY_API Vec1<T> Expand(Vec1<T> v, const Mask1<T> mask) {
return IfThenElseZero(mask, v);
}
// ------------------------------ LoadExpand
template <class D>
HWY_API VFromD<D> LoadExpand(MFromD<D> mask, D d,
const TFromD<D>* HWY_RESTRICT unaligned) {
return MaskedLoad(mask, d, unaligned);
}
// ------------------------------ WidenMulPairwiseAdd
template <class D32, HWY_IF_F32_D(D32)>
HWY_API Vec1<float> WidenMulPairwiseAdd(D32 /* tag */, Vec1<bfloat16_t> a,
Vec1<bfloat16_t> b) {
return Vec1<float>(F32FromBF16(a.raw)) * Vec1<float>(F32FromBF16(b.raw));
}
template <class D32, HWY_IF_I32_D(D32)>
HWY_API Vec1<int32_t> WidenMulPairwiseAdd(D32 /* tag */, Vec1<int16_t> a,
Vec1<int16_t> b) {
return Vec1<int32_t>(a.raw * b.raw);
}
// ------------------------------ SatWidenMulPairwiseAdd
#ifdef HWY_NATIVE_U8_I8_SATWIDENMULPAIRWISEADD
#undef HWY_NATIVE_U8_I8_SATWIDENMULPAIRWISEADD
#else
#define HWY_NATIVE_U8_I8_SATWIDENMULPAIRWISEADD
#endif
template <class DI16, HWY_IF_I16_D(DI16)>
HWY_API Vec1<int16_t> SatWidenMulPairwiseAdd(DI16 /* tag */, Vec1<uint8_t> a,
Vec1<int8_t> b) {
// Saturation of a.raw * b.raw is not needed on the HWY_SCALAR target as the
// input vectors only have 1 lane on the HWY_SCALAR target and as
// a.raw * b.raw is between -32640 and 32385, which is already within the
// range of an int16_t.
// On other targets, a saturated addition of a[0]*b[0] + a[1]*b[1] is needed
// as it is possible for the addition of a[0]*b[0] + a[1]*b[1] to overflow if
// a[0], a[1], b[0], and b[1] are all non-zero and b[0] and b[1] both have the
// same sign.
return Vec1<int16_t>(static_cast<int16_t>(a.raw) *
static_cast<int16_t>(b.raw));
}
// ------------------------------ ReorderWidenMulAccumulate (MulAdd, ZipLower)
template <class D32, HWY_IF_F32_D(D32)>
HWY_API Vec1<float> ReorderWidenMulAccumulate(D32 /* tag */, Vec1<bfloat16_t> a,
Vec1<bfloat16_t> b,
const Vec1<float> sum0,
Vec1<float>& /* sum1 */) {
return MulAdd(Vec1<float>(F32FromBF16(a.raw)),
Vec1<float>(F32FromBF16(b.raw)), sum0);
}
template <class D32, HWY_IF_I32_D(D32)>
HWY_API Vec1<int32_t> ReorderWidenMulAccumulate(D32 /* tag */, Vec1<int16_t> a,
Vec1<int16_t> b,
const Vec1<int32_t> sum0,
Vec1<int32_t>& /* sum1 */) {
return Vec1<int32_t>(a.raw * b.raw + sum0.raw);
}
template <class DU32, HWY_IF_U32_D(DU32)>
HWY_API Vec1<uint32_t> ReorderWidenMulAccumulate(DU32 /* tag */,
Vec1<uint16_t> a,
Vec1<uint16_t> b,
const Vec1<uint32_t> sum0,
Vec1<uint32_t>& /* sum1 */) {
return Vec1<uint32_t>(static_cast<uint32_t>(a.raw) * b.raw + sum0.raw);
}
// ------------------------------ RearrangeToOddPlusEven
template <typename TW>
HWY_API Vec1<TW> RearrangeToOddPlusEven(Vec1<TW> sum0, Vec1<TW> /* sum1 */) {
return sum0; // invariant already holds
}
// ================================================== REDUCTIONS
// Nothing native, generic_ops-inl defines SumOfLanes and ReduceSum.
// NOLINTNEXTLINE(google-readability-namespace-comments)
} // namespace HWY_NAMESPACE
} // namespace hwy
HWY_AFTER_NAMESPACE();