From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 19:32:43 +0200 Subject: Adding upstream version 1:115.7.0. Signed-off-by: Daniel Baumann --- third_party/highway/hwy/contrib/algo/find_test.cc | 219 ++++++++++++++++++++++ 1 file changed, 219 insertions(+) create mode 100644 third_party/highway/hwy/contrib/algo/find_test.cc (limited to 'third_party/highway/hwy/contrib/algo/find_test.cc') diff --git a/third_party/highway/hwy/contrib/algo/find_test.cc b/third_party/highway/hwy/contrib/algo/find_test.cc new file mode 100644 index 0000000000..f438a18ba0 --- /dev/null +++ b/third_party/highway/hwy/contrib/algo/find_test.cc @@ -0,0 +1,219 @@ +// 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 // std::find_if +#include + +#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/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 +T Random(RandomState& rng) { + const int32_t bits = static_cast(Random32(&rng)) & 1023; + const double val = (bits - 512) / 64.0; + // Clamp negative to zero for unsigned types. + return static_cast(HWY_MAX(hwy::LowestValue(), 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 + Mask operator()(D d, V v) const { + return Gt(v, Set(d, static_cast>(val_))); + } + + private: + int val_; +}; + +#endif // !HWY_GENERIC_LAMBDA + +// Invokes Test (e.g. TestFind) with all arg combinations. +template +struct ForeachCountAndMisalign { + template + 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 counts(AdjustedReps(512)); + for (size_t& count : counts) { + count = static_cast(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 + void operator()(D d, size_t count, size_t misalign, RandomState& rng) { + using T = TFromD; + // Must allocate at least one even if count is zero. + AlignedFreeUniquePtr storage = + AllocateAligned(HWY_MAX(1, misalign + count)); + T* in = storage.get() + misalign; + for (size_t i = 0; i < count; ++i) { + in[i] = Random(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(count), + static_cast(in[actual]), static_cast(actual), + static_cast(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(count), + static_cast(in[i]), static_cast(i), + static_cast(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(-9), in, count)); + } +}; + +void TestAllFind() { + ForAllTypes(ForPartialVectors>()); +} + +struct TestFindIf { + template + void operator()(D d, size_t count, size_t misalign, RandomState& rng) { + using T = TFromD; + using TI = MakeSigned; + // Must allocate at least one even if count is zero. + AlignedFreeUniquePtr storage = + AllocateAligned(HWY_MAX(1, misalign + count)); + T* in = storage.get() + misalign; + for (size_t i = 0; i < count; ++i) { + in[i] = Random(rng); + HWY_ASSERT(in[i] < 8); + HWY_ASSERT(!hwy::IsSigned() || static_cast(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() ? -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(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(val); }); + // Convert returned iterator to index. + const size_t expected = static_cast(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(count), + val, static_cast(expected), static_cast(actual)); + hwy::detail::PrintArray(hwy::detail::MakeTypeInfo(), "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>()); +} + +// 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 -- cgit v1.2.3