1 files changed, 543 insertions, 0 deletions
diff --git a/third_party/highway/hwy/tests/arithmetic_test.cc b/third_party/highway/hwy/tests/arithmetic_test.cc
new file mode 100644
index 0000000000..5ce93db608
--- /dev/null
+++ b/third_party/highway/hwy/tests/arithmetic_test.cc
@@ -0,0 +1,543 @@
+// 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
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// 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.
+
+#undef HWY_TARGET_INCLUDE
+#define HWY_TARGET_INCLUDE "tests/arithmetic_test.cc"
+#include "hwy/foreach_target.h"  // IWYU pragma: keep
+#include "hwy/highway.h"
+#include "hwy/tests/test_util-inl.h"
+
+HWY_BEFORE_NAMESPACE();
+namespace hwy {
+namespace HWY_NAMESPACE {
+
+struct TestPlusMinus {
+  template <class T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    const auto v2 = Iota(d, T{2});
+    const auto v3 = Iota(d, T{3});
+    const auto v4 = Iota(d, T{4});
+
+    const size_t N = Lanes(d);
+    auto lanes = AllocateAligned<T>(N);
+    HWY_ASSERT(lanes);
+    for (size_t i = 0; i < N; ++i) {
+      lanes[i] = static_cast<T>((2 + i) + (3 + i));
+    }
+    HWY_ASSERT_VEC_EQ(d, lanes.get(), Add(v2, v3));
+    HWY_ASSERT_VEC_EQ(d, Set(d, T{2}), Sub(v4, v2));
+
+    for (size_t i = 0; i < N; ++i) {
+      lanes[i] = static_cast<T>((2 + i) + (4 + i));
+    }
+    auto sum = v2;
+    sum = Add(sum, v4);  // sum == 6,8..
+    HWY_ASSERT_VEC_EQ(d, Load(d, lanes.get()), sum);
+
+    sum = Sub(sum, v4);
+    HWY_ASSERT_VEC_EQ(d, v2, sum);
+  }
+};
+
+struct TestPlusMinusOverflow {
+  template <class T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    const auto v1 = Iota(d, T(1));
+    const auto vMax = Iota(d, LimitsMax<T>());
+    const auto vMin = Iota(d, LimitsMin<T>());
+
+    // Check that no UB triggered.
+    // "assert" here is formal - to avoid compiler dropping calculations
+    HWY_ASSERT_VEC_EQ(d, Add(v1, vMax), Add(vMax, v1));
+    HWY_ASSERT_VEC_EQ(d, Add(vMax, vMax), Add(vMax, vMax));
+    HWY_ASSERT_VEC_EQ(d, Sub(vMin, v1), Sub(vMin, v1));
+    HWY_ASSERT_VEC_EQ(d, Sub(vMin, vMax), Sub(vMin, vMax));
+  }
+};
+
+HWY_NOINLINE void TestAllPlusMinus() {
+  ForAllTypes(ForPartialVectors<TestPlusMinus>());
+  ForIntegerTypes(ForPartialVectors<TestPlusMinusOverflow>());
+}
+
+struct TestUnsignedSaturatingArithmetic {
+  template <typename T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    const auto v0 = Zero(d);
+    const auto vi = Iota(d, T{1});
+    const auto vm = Set(d, LimitsMax<T>());
+
+    HWY_ASSERT_VEC_EQ(d, Add(v0, v0), SaturatedAdd(v0, v0));
+    HWY_ASSERT_VEC_EQ(d, Add(v0, vi), SaturatedAdd(v0, vi));
+    HWY_ASSERT_VEC_EQ(d, Add(v0, vm), SaturatedAdd(v0, vm));
+    HWY_ASSERT_VEC_EQ(d, vm, SaturatedAdd(vi, vm));
+    HWY_ASSERT_VEC_EQ(d, vm, SaturatedAdd(vm, vm));
+
+    HWY_ASSERT_VEC_EQ(d, v0, SaturatedSub(v0, v0));
+    HWY_ASSERT_VEC_EQ(d, v0, SaturatedSub(v0, vi));
+    HWY_ASSERT_VEC_EQ(d, v0, SaturatedSub(vi, vi));
+    HWY_ASSERT_VEC_EQ(d, v0, SaturatedSub(vi, vm));
+    HWY_ASSERT_VEC_EQ(d, Sub(vm, vi), SaturatedSub(vm, vi));
+  }
+};
+
+struct TestSignedSaturatingArithmetic {
+  template <typename T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    const auto v0 = Zero(d);
+    const auto vpm = Set(d, LimitsMax<T>());
+    // Ensure all lanes are positive, even if Iota wraps around
+    const auto vi = Or(And(Iota(d, 0), vpm), Set(d, T{1}));
+    const auto vn = Sub(v0, vi);
+    const auto vnm = Set(d, LimitsMin<T>());
+    HWY_ASSERT_MASK_EQ(d, MaskTrue(d), Gt(vi, v0));
+    HWY_ASSERT_MASK_EQ(d, MaskTrue(d), Lt(vn, v0));
+
+    HWY_ASSERT_VEC_EQ(d, v0, SaturatedAdd(v0, v0));
+    HWY_ASSERT_VEC_EQ(d, vi, SaturatedAdd(v0, vi));
+    HWY_ASSERT_VEC_EQ(d, vpm, SaturatedAdd(v0, vpm));
+    HWY_ASSERT_VEC_EQ(d, vpm, SaturatedAdd(vi, vpm));
+    HWY_ASSERT_VEC_EQ(d, vpm, SaturatedAdd(vpm, vpm));
+
+    HWY_ASSERT_VEC_EQ(d, v0, SaturatedSub(v0, v0));
+    HWY_ASSERT_VEC_EQ(d, Sub(v0, vi), SaturatedSub(v0, vi));
+    HWY_ASSERT_VEC_EQ(d, vn, SaturatedSub(vn, v0));
+    HWY_ASSERT_VEC_EQ(d, vnm, SaturatedSub(vnm, vi));
+    HWY_ASSERT_VEC_EQ(d, vnm, SaturatedSub(vnm, vpm));
+  }
+};
+
+struct TestSaturatingArithmeticOverflow {
+  template <class T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    const auto v1 = Iota(d, T(1));
+    const auto vMax = Iota(d, LimitsMax<T>());
+    const auto vMin = Iota(d, LimitsMin<T>());
+
+    // Check that no UB triggered.
+    // "assert" here is formal - to avoid compiler dropping calculations
+    HWY_ASSERT_VEC_EQ(d, SaturatedAdd(v1, vMax), SaturatedAdd(vMax, v1));
+    HWY_ASSERT_VEC_EQ(d, SaturatedAdd(vMax, vMax), SaturatedAdd(vMax, vMax));
+    HWY_ASSERT_VEC_EQ(d, SaturatedAdd(vMin, vMax), SaturatedAdd(vMin, vMax));
+    HWY_ASSERT_VEC_EQ(d, SaturatedAdd(vMin, vMin), SaturatedAdd(vMin, vMin));
+    HWY_ASSERT_VEC_EQ(d, SaturatedSub(vMin, v1), SaturatedSub(vMin, v1));
+    HWY_ASSERT_VEC_EQ(d, SaturatedSub(vMin, vMax), SaturatedSub(vMin, vMax));
+    HWY_ASSERT_VEC_EQ(d, SaturatedSub(vMax, vMin), SaturatedSub(vMax, vMin));
+    HWY_ASSERT_VEC_EQ(d, SaturatedSub(vMin, vMin), SaturatedSub(vMin, vMin));
+  }
+};
+
+HWY_NOINLINE void TestAllSaturatingArithmetic() {
+  ForUnsignedTypes(ForPartialVectors<TestUnsignedSaturatingArithmetic>());
+  ForSignedTypes(ForPartialVectors<TestSignedSaturatingArithmetic>());
+  ForIntegerTypes(ForPartialVectors<TestSaturatingArithmeticOverflow>());
+}
+
+struct TestAverage {
+  template <typename T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    const auto v0 = Zero(d);
+    const auto v1 = Set(d, T{1});
+    const auto v2 = Set(d, T{2});
+
+    HWY_ASSERT_VEC_EQ(d, v0, AverageRound(v0, v0));
+    HWY_ASSERT_VEC_EQ(d, v1, AverageRound(v0, v1));
+    HWY_ASSERT_VEC_EQ(d, v1, AverageRound(v1, v1));
+    HWY_ASSERT_VEC_EQ(d, v2, AverageRound(v1, v2));
+    HWY_ASSERT_VEC_EQ(d, v2, AverageRound(v2, v2));
+  }
+};
+
+HWY_NOINLINE void TestAllAverage() {
+  const ForPartialVectors<TestAverage> test;
+  test(uint8_t());
+  test(uint16_t());
+}
+
+struct TestAbs {
+  template <typename T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    const auto v0 = Zero(d);
+    const auto vp1 = Set(d, T{1});
+    const auto vn1 = Set(d, T{-1});
+    const auto vpm = Set(d, LimitsMax<T>());
+    const auto vnm = Set(d, LimitsMin<T>());
+
+    HWY_ASSERT_VEC_EQ(d, v0, Abs(v0));
+    HWY_ASSERT_VEC_EQ(d, vp1, Abs(vp1));
+    HWY_ASSERT_VEC_EQ(d, vp1, Abs(vn1));
+    HWY_ASSERT_VEC_EQ(d, vpm, Abs(vpm));
+    HWY_ASSERT_VEC_EQ(d, vnm, Abs(vnm));
+  }
+};
+
+struct TestFloatAbs {
+  template <typename T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    const auto v0 = Zero(d);
+    const auto vp1 = Set(d, T{1});
+    const auto vn1 = Set(d, T{-1});
+    const auto vp2 = Set(d, static_cast<T>(0.01));
+    const auto vn2 = Set(d, static_cast<T>(-0.01));
+
+    HWY_ASSERT_VEC_EQ(d, v0, Abs(v0));
+    HWY_ASSERT_VEC_EQ(d, vp1, Abs(vp1));
+    HWY_ASSERT_VEC_EQ(d, vp1, Abs(vn1));
+    HWY_ASSERT_VEC_EQ(d, vp2, Abs(vp2));
+    HWY_ASSERT_VEC_EQ(d, vp2, Abs(vn2));
+  }
+};
+
+HWY_NOINLINE void TestAllAbs() {
+  ForSignedTypes(ForPartialVectors<TestAbs>());
+  ForFloatTypes(ForPartialVectors<TestFloatAbs>());
+}
+
+struct TestNeg {
+  template <typename T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    const auto v0 = Zero(d);
+    const auto vn = Set(d, T{-3});
+    const auto vp = Set(d, T{3});
+    HWY_ASSERT_VEC_EQ(d, v0, Neg(v0));
+    HWY_ASSERT_VEC_EQ(d, vp, Neg(vn));
+    HWY_ASSERT_VEC_EQ(d, vn, Neg(vp));
+  }
+};
+
+struct TestNegOverflow {
+  template <typename T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    const auto vn = Set(d, LimitsMin<T>());
+    const auto vp = Set(d, LimitsMax<T>());
+    HWY_ASSERT_VEC_EQ(d, Neg(vn), Neg(vn));
+    HWY_ASSERT_VEC_EQ(d, Neg(vp), Neg(vp));
+  }
+};
+
+HWY_NOINLINE void TestAllNeg() {
+  ForSignedTypes(ForPartialVectors<TestNeg>());
+  ForFloatTypes(ForPartialVectors<TestNeg>());
+  ForSignedTypes(ForPartialVectors<TestNegOverflow>());
+}
+
+struct TestUnsignedMinMax {
+  template <typename T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    const auto v0 = Zero(d);
+    // Leave headroom such that v1 < v2 even after wraparound.
+    const auto mod = And(Iota(d, 0), Set(d, LimitsMax<T>() >> 1));
+    const auto v1 = Add(mod, Set(d, T{1}));
+    const auto v2 = Add(mod, Set(d, T{2}));
+    HWY_ASSERT_VEC_EQ(d, v1, Min(v1, v2));
+    HWY_ASSERT_VEC_EQ(d, v2, Max(v1, v2));
+    HWY_ASSERT_VEC_EQ(d, v0, Min(v1, v0));
+    HWY_ASSERT_VEC_EQ(d, v1, Max(v1, v0));
+
+    const auto vmin = Set(d, LimitsMin<T>());
+    const auto vmax = Set(d, LimitsMax<T>());
+
+    HWY_ASSERT_VEC_EQ(d, vmin, Min(vmin, vmax));
+    HWY_ASSERT_VEC_EQ(d, vmin, Min(vmax, vmin));
+
+    HWY_ASSERT_VEC_EQ(d, vmax, Max(vmin, vmax));
+    HWY_ASSERT_VEC_EQ(d, vmax, Max(vmax, vmin));
+  }
+};
+
+struct TestSignedMinMax {
+  template <typename T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    // Leave headroom such that v1 < v2 even after wraparound.
+    const auto mod =
+        And(Iota(d, 0), Set(d, static_cast<T>(LimitsMax<T>() >> 1)));
+    const auto v1 = Add(mod, Set(d, T{1}));
+    const auto v2 = Add(mod, Set(d, T{2}));
+    const auto v_neg = Sub(Zero(d), v1);
+    HWY_ASSERT_VEC_EQ(d, v1, Min(v1, v2));
+    HWY_ASSERT_VEC_EQ(d, v2, Max(v1, v2));
+    HWY_ASSERT_VEC_EQ(d, v_neg, Min(v1, v_neg));
+    HWY_ASSERT_VEC_EQ(d, v1, Max(v1, v_neg));
+
+    const auto v0 = Zero(d);
+    const auto vmin = Set(d, LimitsMin<T>());
+    const auto vmax = Set(d, LimitsMax<T>());
+    HWY_ASSERT_VEC_EQ(d, vmin, Min(v0, vmin));
+    HWY_ASSERT_VEC_EQ(d, vmin, Min(vmin, v0));
+    HWY_ASSERT_VEC_EQ(d, v0, Max(v0, vmin));
+    HWY_ASSERT_VEC_EQ(d, v0, Max(vmin, v0));
+
+    HWY_ASSERT_VEC_EQ(d, vmin, Min(vmin, vmax));
+    HWY_ASSERT_VEC_EQ(d, vmin, Min(vmax, vmin));
+
+    HWY_ASSERT_VEC_EQ(d, vmax, Max(vmin, vmax));
+    HWY_ASSERT_VEC_EQ(d, vmax, Max(vmax, vmin));
+  }
+};
+
+struct TestFloatMinMax {
+  template <typename T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    const auto v1 = Iota(d, 1);
+    const auto v2 = Iota(d, 2);
+    const auto v_neg = Iota(d, -T(Lanes(d)));
+    HWY_ASSERT_VEC_EQ(d, v1, Min(v1, v2));
+    HWY_ASSERT_VEC_EQ(d, v2, Max(v1, v2));
+    HWY_ASSERT_VEC_EQ(d, v_neg, Min(v1, v_neg));
+    HWY_ASSERT_VEC_EQ(d, v1, Max(v1, v_neg));
+
+    const auto v0 = Zero(d);
+    const auto vmin = Set(d, static_cast<T>(-1E30));
+    const auto vmax = Set(d, static_cast<T>(1E30));
+    HWY_ASSERT_VEC_EQ(d, vmin, Min(v0, vmin));
+    HWY_ASSERT_VEC_EQ(d, vmin, Min(vmin, v0));
+    HWY_ASSERT_VEC_EQ(d, v0, Max(v0, vmin));
+    HWY_ASSERT_VEC_EQ(d, v0, Max(vmin, v0));
+
+    HWY_ASSERT_VEC_EQ(d, vmin, Min(vmin, vmax));
+    HWY_ASSERT_VEC_EQ(d, vmin, Min(vmax, vmin));
+
+    HWY_ASSERT_VEC_EQ(d, vmax, Max(vmin, vmax));
+    HWY_ASSERT_VEC_EQ(d, vmax, Max(vmax, vmin));
+  }
+};
+
+HWY_NOINLINE void TestAllMinMax() {
+  ForUnsignedTypes(ForPartialVectors<TestUnsignedMinMax>());
+  ForSignedTypes(ForPartialVectors<TestSignedMinMax>());
+  ForFloatTypes(ForPartialVectors<TestFloatMinMax>());
+}
+
+template <class D>
+static HWY_NOINLINE Vec<D> Make128(D d, uint64_t hi, uint64_t lo) {
+  alignas(16) uint64_t in[2];
+  in[0] = lo;
+  in[1] = hi;
+  return LoadDup128(d, in);
+}
+
+struct TestMinMax128 {
+  template <typename T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    using V = Vec<D>;
+    const size_t N = Lanes(d);
+    auto a_lanes = AllocateAligned<T>(N);
+    auto b_lanes = AllocateAligned<T>(N);
+    auto min_lanes = AllocateAligned<T>(N);
+    auto max_lanes = AllocateAligned<T>(N);
+    RandomState rng;
+
+    const V v00 = Zero(d);
+    const V v01 = Make128(d, 0, 1);
+    const V v10 = Make128(d, 1, 0);
+    const V v11 = Add(v01, v10);
+
+    // Same arg
+    HWY_ASSERT_VEC_EQ(d, v00, Min128(d, v00, v00));
+    HWY_ASSERT_VEC_EQ(d, v01, Min128(d, v01, v01));
+    HWY_ASSERT_VEC_EQ(d, v10, Min128(d, v10, v10));
+    HWY_ASSERT_VEC_EQ(d, v11, Min128(d, v11, v11));
+    HWY_ASSERT_VEC_EQ(d, v00, Max128(d, v00, v00));
+    HWY_ASSERT_VEC_EQ(d, v01, Max128(d, v01, v01));
+    HWY_ASSERT_VEC_EQ(d, v10, Max128(d, v10, v10));
+    HWY_ASSERT_VEC_EQ(d, v11, Max128(d, v11, v11));
+
+    // First arg less
+    HWY_ASSERT_VEC_EQ(d, v00, Min128(d, v00, v01));
+    HWY_ASSERT_VEC_EQ(d, v01, Min128(d, v01, v10));
+    HWY_ASSERT_VEC_EQ(d, v10, Min128(d, v10, v11));
+    HWY_ASSERT_VEC_EQ(d, v01, Max128(d, v00, v01));
+    HWY_ASSERT_VEC_EQ(d, v10, Max128(d, v01, v10));
+    HWY_ASSERT_VEC_EQ(d, v11, Max128(d, v10, v11));
+
+    // Second arg less
+    HWY_ASSERT_VEC_EQ(d, v00, Min128(d, v01, v00));
+    HWY_ASSERT_VEC_EQ(d, v01, Min128(d, v10, v01));
+    HWY_ASSERT_VEC_EQ(d, v10, Min128(d, v11, v10));
+    HWY_ASSERT_VEC_EQ(d, v01, Max128(d, v01, v00));
+    HWY_ASSERT_VEC_EQ(d, v10, Max128(d, v10, v01));
+    HWY_ASSERT_VEC_EQ(d, v11, Max128(d, v11, v10));
+
+    // Also check 128-bit blocks are independent
+    for (size_t rep = 0; rep < AdjustedReps(1000); ++rep) {
+      for (size_t i = 0; i < N; ++i) {
+        a_lanes[i] = Random64(&rng);
+        b_lanes[i] = Random64(&rng);
+      }
+      const V a = Load(d, a_lanes.get());
+      const V b = Load(d, b_lanes.get());
+      for (size_t i = 0; i < N; i += 2) {
+        const bool lt = a_lanes[i + 1] == b_lanes[i + 1]
+                            ? (a_lanes[i] < b_lanes[i])
+                            : (a_lanes[i + 1] < b_lanes[i + 1]);
+        min_lanes[i + 0] = lt ? a_lanes[i + 0] : b_lanes[i + 0];
+        min_lanes[i + 1] = lt ? a_lanes[i + 1] : b_lanes[i + 1];
+        max_lanes[i + 0] = lt ? b_lanes[i + 0] : a_lanes[i + 0];
+        max_lanes[i + 1] = lt ? b_lanes[i + 1] : a_lanes[i + 1];
+      }
+      HWY_ASSERT_VEC_EQ(d, min_lanes.get(), Min128(d, a, b));
+      HWY_ASSERT_VEC_EQ(d, max_lanes.get(), Max128(d, a, b));
+    }
+  }
+};
+
+HWY_NOINLINE void TestAllMinMax128() {
+  ForGEVectors<128, TestMinMax128>()(uint64_t());
+}
+
+struct TestMinMax128Upper {
+  template <typename T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    using V = Vec<D>;
+    const size_t N = Lanes(d);
+    auto a_lanes = AllocateAligned<T>(N);
+    auto b_lanes = AllocateAligned<T>(N);
+    auto min_lanes = AllocateAligned<T>(N);
+    auto max_lanes = AllocateAligned<T>(N);
+    RandomState rng;
+
+    const V v00 = Zero(d);
+    const V v01 = Make128(d, 0, 1);
+    const V v10 = Make128(d, 1, 0);
+    const V v11 = Add(v01, v10);
+
+    // Same arg
+    HWY_ASSERT_VEC_EQ(d, v00, Min128Upper(d, v00, v00));
+    HWY_ASSERT_VEC_EQ(d, v01, Min128Upper(d, v01, v01));
+    HWY_ASSERT_VEC_EQ(d, v10, Min128Upper(d, v10, v10));
+    HWY_ASSERT_VEC_EQ(d, v11, Min128Upper(d, v11, v11));
+    HWY_ASSERT_VEC_EQ(d, v00, Max128Upper(d, v00, v00));
+    HWY_ASSERT_VEC_EQ(d, v01, Max128Upper(d, v01, v01));
+    HWY_ASSERT_VEC_EQ(d, v10, Max128Upper(d, v10, v10));
+    HWY_ASSERT_VEC_EQ(d, v11, Max128Upper(d, v11, v11));
+
+    // Equivalent but not equal (chooses second arg)
+    HWY_ASSERT_VEC_EQ(d, v01, Min128Upper(d, v00, v01));
+    HWY_ASSERT_VEC_EQ(d, v11, Min128Upper(d, v10, v11));
+    HWY_ASSERT_VEC_EQ(d, v00, Min128Upper(d, v01, v00));
+    HWY_ASSERT_VEC_EQ(d, v10, Min128Upper(d, v11, v10));
+    HWY_ASSERT_VEC_EQ(d, v00, Max128Upper(d, v01, v00));
+    HWY_ASSERT_VEC_EQ(d, v10, Max128Upper(d, v11, v10));
+    HWY_ASSERT_VEC_EQ(d, v01, Max128Upper(d, v00, v01));
+    HWY_ASSERT_VEC_EQ(d, v11, Max128Upper(d, v10, v11));
+
+    // First arg less
+    HWY_ASSERT_VEC_EQ(d, v01, Min128Upper(d, v01, v10));
+    HWY_ASSERT_VEC_EQ(d, v10, Max128Upper(d, v01, v10));
+
+    // Second arg less
+    HWY_ASSERT_VEC_EQ(d, v01, Min128Upper(d, v10, v01));
+    HWY_ASSERT_VEC_EQ(d, v10, Max128Upper(d, v10, v01));
+
+    // Also check 128-bit blocks are independent
+    for (size_t rep = 0; rep < AdjustedReps(1000); ++rep) {
+      for (size_t i = 0; i < N; ++i) {
+        a_lanes[i] = Random64(&rng);
+        b_lanes[i] = Random64(&rng);
+      }
+      const V a = Load(d, a_lanes.get());
+      const V b = Load(d, b_lanes.get());
+      for (size_t i = 0; i < N; i += 2) {
+        const bool lt = a_lanes[i + 1] < b_lanes[i + 1];
+        min_lanes[i + 0] = lt ? a_lanes[i + 0] : b_lanes[i + 0];
+        min_lanes[i + 1] = lt ? a_lanes[i + 1] : b_lanes[i + 1];
+        max_lanes[i + 0] = lt ? b_lanes[i + 0] : a_lanes[i + 0];
+        max_lanes[i + 1] = lt ? b_lanes[i + 1] : a_lanes[i + 1];
+      }
+      HWY_ASSERT_VEC_EQ(d, min_lanes.get(), Min128Upper(d, a, b));
+      HWY_ASSERT_VEC_EQ(d, max_lanes.get(), Max128Upper(d, a, b));
+    }
+  }
+};
+
+HWY_NOINLINE void TestAllMinMax128Upper() {
+  ForGEVectors<128, TestMinMax128Upper>()(uint64_t());
+}
+
+struct TestIntegerAbsDiff {
+  template<typename T, HWY_IF_T_SIZE_ONE_OF(T, (1 << 1) | (1 << 2) | (1 << 4))>
+  static inline T ScalarAbsDiff(T a, T b) {
+    using TW = MakeSigned<MakeWide<T>>;
+    const TW diff = static_cast<TW>(a) - static_cast<TW>(b);
+    return static_cast<T>((diff >= 0) ? diff : -diff);
+  }
+  template<typename T, HWY_IF_T_SIZE(T, 8)>
+  static inline T ScalarAbsDiff(T a, T b) {
+    if (a >= b) {
+      return a - b;
+    } else {
+      return b - a;
+    }
+  }
+
+  template <typename T, class D>
+  HWY_NOINLINE void operator()(T /*unused*/, D d) {
+    const size_t N = Lanes(d);
+    auto in_lanes_a = AllocateAligned<T>(N);
+    auto in_lanes_b = AllocateAligned<T>(N);
+    auto out_lanes = AllocateAligned<T>(N);
+    constexpr size_t shift_amt_mask = sizeof(T) * 8 - 1;
+    for (size_t i = 0; i < N; ++i) {
+      // Need to mask out shift_amt as i can be greater than or equal to
+      // the number of bits in T if T is int8_t, uint8_t, int16_t, or uint16_t.
+      const auto shift_amt = i & shift_amt_mask;
+      in_lanes_a[i] =
+        static_cast<T>((static_cast<uint64_t>(i) ^ 1u) << shift_amt);
+      in_lanes_b[i] =
+        static_cast<T>(static_cast<uint64_t>(i) << shift_amt);
+      out_lanes[i] = ScalarAbsDiff(in_lanes_a[i], in_lanes_b[i]);
+    }
+    const auto a = Load(d, in_lanes_a.get());
+    const auto b = Load(d, in_lanes_b.get());
+    const auto expected = Load(d, out_lanes.get());
+    HWY_ASSERT_VEC_EQ(d, expected, AbsDiff(a, b));
+    HWY_ASSERT_VEC_EQ(d, expected, AbsDiff(b, a));
+  }
+};
+
+HWY_NOINLINE void TestAllIntegerAbsDiff() {
+  ForPartialVectors<TestIntegerAbsDiff>()(int8_t());
+  ForPartialVectors<TestIntegerAbsDiff>()(uint8_t());
+  ForPartialVectors<TestIntegerAbsDiff>()(int16_t());
+  ForPartialVectors<TestIntegerAbsDiff>()(uint16_t());
+  ForPartialVectors<TestIntegerAbsDiff>()(int32_t());
+  ForPartialVectors<TestIntegerAbsDiff>()(uint32_t());
+#if HWY_HAVE_INTEGER64
+  ForPartialVectors<TestIntegerAbsDiff>()(int64_t());
+  ForPartialVectors<TestIntegerAbsDiff>()(uint64_t());
+#endif
+}
+
+// NOLINTNEXTLINE(google-readability-namespace-comments)
+}  // namespace HWY_NAMESPACE
+}  // namespace hwy
+HWY_AFTER_NAMESPACE();
+
+#if HWY_ONCE
+
+namespace hwy {
+HWY_BEFORE_TEST(HwyArithmeticTest);
+HWY_EXPORT_AND_TEST_P(HwyArithmeticTest, TestAllPlusMinus);
+HWY_EXPORT_AND_TEST_P(HwyArithmeticTest, TestAllSaturatingArithmetic);
+HWY_EXPORT_AND_TEST_P(HwyArithmeticTest, TestAllAverage);
+HWY_EXPORT_AND_TEST_P(HwyArithmeticTest, TestAllAbs);
+HWY_EXPORT_AND_TEST_P(HwyArithmeticTest, TestAllNeg);
+HWY_EXPORT_AND_TEST_P(HwyArithmeticTest, TestAllMinMax);
+HWY_EXPORT_AND_TEST_P(HwyArithmeticTest, TestAllMinMax128);
+HWY_EXPORT_AND_TEST_P(HwyArithmeticTest, TestAllMinMax128Upper);
+HWY_EXPORT_AND_TEST_P(HwyArithmeticTest, TestAllIntegerAbsDiff);
+}  // namespace hwy
+
+#endif