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// Copyright 2022 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.
#include <stdio.h>
#include <algorithm> // std::find_if
#include <vector>
#include "hwy/aligned_allocator.h"
#include "hwy/base.h"
#include "hwy/print.h"
// clang-format off
#undef HWY_TARGET_INCLUDE
#define HWY_TARGET_INCLUDE "hwy/contrib/algo/find_test.cc"
#include "hwy/foreach_target.h" // IWYU pragma: keep
#include "hwy/highway.h"
#include "hwy/contrib/algo/find-inl.h"
#include "hwy/tests/test_util-inl.h"
// clang-format on
// If your project requires C++14 or later, you can ignore this and pass lambdas
// directly to FindIf, without requiring an lvalue as we do here for C++11.
#if __cplusplus < 201402L
#define HWY_GENERIC_LAMBDA 0
#else
#define HWY_GENERIC_LAMBDA 1
#endif
HWY_BEFORE_NAMESPACE();
namespace hwy {
namespace HWY_NAMESPACE {
// Returns random number in [-8, 8) - we use knowledge of the range to Find()
// values we know are not present.
template <typename T>
T Random(RandomState& rng) {
const int32_t bits = static_cast<int32_t>(Random32(&rng)) & 1023;
const double val = (bits - 512) / 64.0;
// Clamp negative to zero for unsigned types.
return static_cast<T>(HWY_MAX(hwy::LowestValue<T>(), val));
}
// In C++14, we can instead define these as generic lambdas next to where they
// are invoked.
#if !HWY_GENERIC_LAMBDA
class GreaterThan {
public:
GreaterThan(int val) : val_(val) {}
template <class D, class V>
Mask<D> operator()(D d, V v) const {
return Gt(v, Set(d, static_cast<TFromD<D>>(val_)));
}
private:
int val_;
};
#endif // !HWY_GENERIC_LAMBDA
// Invokes Test (e.g. TestFind) with all arg combinations.
template <class Test>
struct ForeachCountAndMisalign {
template <typename T, class D>
HWY_NOINLINE void operator()(T /*unused*/, D d) const {
RandomState rng;
const size_t N = Lanes(d);
const size_t misalignments[3] = {0, N / 4, 3 * N / 5};
// Find() checks 8 vectors at a time, so we want to cover a fairly large
// range without oversampling (checking every possible count).
std::vector<size_t> counts(AdjustedReps(512));
for (size_t& count : counts) {
count = static_cast<size_t>(rng()) % (16 * N + 1);
}
counts[0] = 0; // ensure we test count=0.
for (size_t count : counts) {
for (size_t m : misalignments) {
Test()(d, count, m, rng);
}
}
}
};
struct TestFind {
template <class D>
void operator()(D d, size_t count, size_t misalign, RandomState& rng) {
using T = TFromD<D>;
// Must allocate at least one even if count is zero.
AlignedFreeUniquePtr<T[]> storage =
AllocateAligned<T>(HWY_MAX(1, misalign + count));
HWY_ASSERT(storage);
T* in = storage.get() + misalign;
for (size_t i = 0; i < count; ++i) {
in[i] = Random<T>(rng);
}
// For each position, search for that element (which we know is there)
for (size_t pos = 0; pos < count; ++pos) {
const size_t actual = Find(d, in[pos], in, count);
// We may have found an earlier occurrence of the same value; ensure the
// value is the same, and that it is the first.
if (!IsEqual(in[pos], in[actual])) {
fprintf(stderr, "%s count %d, found %.15f at %d but wanted %.15f\n",
hwy::TypeName(T(), Lanes(d)).c_str(), static_cast<int>(count),
static_cast<double>(in[actual]), static_cast<int>(actual),
static_cast<double>(in[pos]));
HWY_ASSERT(false);
}
for (size_t i = 0; i < actual; ++i) {
if (IsEqual(in[i], in[pos])) {
fprintf(stderr, "%s count %d, found %f at %d but Find returned %d\n",
hwy::TypeName(T(), Lanes(d)).c_str(), static_cast<int>(count),
static_cast<double>(in[i]), static_cast<int>(i),
static_cast<int>(actual));
HWY_ASSERT(false);
}
}
}
// Also search for values we know not to be present (out of range)
HWY_ASSERT_EQ(count, Find(d, T{9}, in, count));
HWY_ASSERT_EQ(count, Find(d, static_cast<T>(-9), in, count));
}
};
void TestAllFind() {
ForAllTypes(ForPartialVectors<ForeachCountAndMisalign<TestFind>>());
}
struct TestFindIf {
template <class D>
void operator()(D d, size_t count, size_t misalign, RandomState& rng) {
using T = TFromD<D>;
using TI = MakeSigned<T>;
// Must allocate at least one even if count is zero.
AlignedFreeUniquePtr<T[]> storage =
AllocateAligned<T>(HWY_MAX(1, misalign + count));
HWY_ASSERT(storage);
T* in = storage.get() + misalign;
for (size_t i = 0; i < count; ++i) {
in[i] = Random<T>(rng);
HWY_ASSERT(in[i] < 8);
HWY_ASSERT(!hwy::IsSigned<T>() || static_cast<TI>(in[i]) >= -8);
}
bool found_any = false;
bool not_found_any = false;
// unsigned T would be promoted to signed and compare greater than any
// negative val, whereas Set() would just cast to an unsigned value and the
// comparison remains unsigned, so avoid negative numbers there.
const int min_val = IsSigned<T>() ? -9 : 0;
// Includes out-of-range value 9 to test the not-found path.
for (int val = min_val; val <= 9; ++val) {
#if HWY_GENERIC_LAMBDA
const auto greater = [val](const auto d, const auto v) HWY_ATTR {
return Gt(v, Set(d, static_cast<T>(val)));
};
#else
const GreaterThan greater(val);
#endif
const size_t actual = FindIf(d, in, count, greater);
found_any |= actual < count;
not_found_any |= actual == count;
const auto pos = std::find_if(
in, in + count, [val](T x) { return x > static_cast<T>(val); });
// Convert returned iterator to index.
const size_t expected = static_cast<size_t>(pos - in);
if (expected != actual) {
fprintf(stderr, "%s count %d val %d, expected %d actual %d\n",
hwy::TypeName(T(), Lanes(d)).c_str(), static_cast<int>(count),
val, static_cast<int>(expected), static_cast<int>(actual));
hwy::detail::PrintArray(hwy::detail::MakeTypeInfo<T>(), "in", in, count,
0, count);
HWY_ASSERT(false);
}
}
// We will always not-find something due to val=9.
HWY_ASSERT(not_found_any);
// We'll find something unless the input is empty or {0} - because 0 > i
// is false for all i=[0,9].
if (count != 0 && in[0] != 0) {
HWY_ASSERT(found_any);
}
}
};
void TestAllFindIf() {
ForAllTypes(ForPartialVectors<ForeachCountAndMisalign<TestFindIf>>());
}
// NOLINTNEXTLINE(google-readability-namespace-comments)
} // namespace HWY_NAMESPACE
} // namespace hwy
HWY_AFTER_NAMESPACE();
#if HWY_ONCE
namespace hwy {
HWY_BEFORE_TEST(FindTest);
HWY_EXPORT_AND_TEST_P(FindTest, TestAllFind);
HWY_EXPORT_AND_TEST_P(FindTest, TestAllFindIf);
} // namespace hwy
#endif
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