143 lines
4.5 KiB
C++
143 lines
4.5 KiB
C++
// Copyright 2020 Google LLC
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// SPDX-License-Identifier: Apache-2.0
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Example of unit test for the "skeleton" library.
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#include "hwy/examples/skeleton.h"
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#include <stdint.h>
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#include <stdio.h>
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#undef HWY_TARGET_INCLUDE
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#define HWY_TARGET_INCLUDE "examples/skeleton_test.cc"
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#include "hwy/foreach_target.h" // IWYU pragma: keep
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// Must come after foreach_target.h to avoid redefinition errors.
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#include "hwy/highway.h"
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#include "hwy/nanobenchmark.h" // Unpredictable1
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#include "hwy/tests/test_util-inl.h"
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// Optional: factor out parts of the implementation into *-inl.h
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// (must also come after foreach_target.h to avoid redefinition errors)
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#include "hwy/examples/skeleton-inl.h"
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HWY_BEFORE_NAMESPACE();
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namespace skeleton {
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namespace HWY_NAMESPACE {
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namespace hn = hwy::HWY_NAMESPACE;
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// Calls function defined in skeleton.cc.
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struct TestFloorLog2 {
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template <class T, class DF>
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HWY_NOINLINE void operator()(T /*unused*/, DF df) {
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const size_t count = 5 * hn::Lanes(df);
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auto in = hwy::AllocateAligned<uint8_t>(count);
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auto expected = hwy::AllocateAligned<uint8_t>(count);
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auto out = hwy::AllocateAligned<uint8_t>(count);
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HWY_ASSERT(in && expected && out);
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hwy::RandomState rng;
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for (size_t i = 0; i < count; ++i) {
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expected[i] = Random32(&rng) & 7;
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in[i] = static_cast<uint8_t>(1u << expected[i]);
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}
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CallFloorLog2(in.get(), count, out.get());
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int sum = 0;
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for (size_t i = 0; i < count; ++i) {
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HWY_ASSERT_EQ(expected[i], out[i]);
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sum += out[i];
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}
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for (size_t i = 0; i < count; ++i) {
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out[i] = static_cast<uint8_t>(hwy::Unpredictable1());
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}
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SavedCallFloorLog2(in.get(), count, out.get());
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for (size_t i = 0; i < count; ++i) {
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HWY_ASSERT_EQ(expected[i], out[i]);
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sum += out[i];
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}
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hwy::PreventElision(sum);
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}
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};
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HWY_NOINLINE void TestAllFloorLog2() {
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hn::ForPartialVectors<TestFloorLog2>()(float());
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}
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// Calls function defined in skeleton-inl.h.
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struct TestSumMulAdd {
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template <class T, class D>
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HWY_NOINLINE void operator()(T /*unused*/, D d) {
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hwy::RandomState rng;
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const size_t count = 4096;
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HWY_ASSERT_EQ(size_t{0}, count % hn::Lanes(d));
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auto mul = hwy::AllocateAligned<T>(count);
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auto x = hwy::AllocateAligned<T>(count);
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auto add = hwy::AllocateAligned<T>(count);
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for (size_t i = 0; i < count; ++i) {
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mul[i] = hwy::ConvertScalarTo<T>(Random32(&rng) & 0xF);
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x[i] = hwy::ConvertScalarTo<T>(Random32(&rng) & 0xFF);
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add[i] = hwy::ConvertScalarTo<T>(Random32(&rng) & 0xFF);
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}
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double expected_sum = 0.0;
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for (size_t i = 0; i < count; ++i) {
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expected_sum += hwy::ConvertScalarTo<double>(mul[i]) *
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hwy::ConvertScalarTo<double>(x[i]) +
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hwy::ConvertScalarTo<double>(add[i]);
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}
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MulAddLoop(d, mul.get(), add.get(), count, x.get());
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double vector_sum = 0.0;
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for (size_t i = 0; i < count; ++i) {
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vector_sum += x[i];
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}
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if (hwy::IsSame<T, hwy::float16_t>()) {
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// The expected value for float16 will vary based on the underlying
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// implementation (compiler emulation, ARM ACLE __fp16 vs _Float16, etc).
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// In some cases the scalar and vector paths will have different results;
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// we check them against known values where possible, else we ignore them.
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#if HWY_COMPILER_CLANG && HWY_NEON_HAVE_F16C
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HWY_ASSERT_EQ(4344240.0, expected_sum); // Full-width float
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HWY_ASSERT_EQ(4344235.0, vector_sum); // __fp16
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#endif
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return;
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}
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HWY_ASSERT_EQ(4344240.0, expected_sum);
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HWY_ASSERT_EQ(expected_sum, vector_sum);
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}
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};
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HWY_NOINLINE void TestAllSumMulAdd() {
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hn::ForFloatTypes(hn::ForPartialVectors<TestSumMulAdd>());
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}
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// NOLINTNEXTLINE(google-readability-namespace-comments)
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} // namespace HWY_NAMESPACE
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} // namespace skeleton
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HWY_AFTER_NAMESPACE();
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#if HWY_ONCE
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namespace skeleton {
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HWY_BEFORE_TEST(SkeletonTest);
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HWY_EXPORT_AND_TEST_P(SkeletonTest, TestAllFloorLog2);
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HWY_EXPORT_AND_TEST_P(SkeletonTest, TestAllSumMulAdd);
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} // namespace skeleton
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#endif
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