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// Copyright 2021 The libgav1 Authors
//
// 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 "src/dsp/x86/common_sse4.h"
#include "gtest/gtest.h"
#if LIBGAV1_TARGETING_SSE4_1
#include <cstdint>
#include "src/utils/common.h"
namespace libgav1 {
namespace dsp {
namespace {
// Show that RightShiftWithRounding_S16() is equal to
// RightShiftWithRounding() only for values less than or equal to
// INT16_MAX - ((1 << bits) >> 1). In particular, if bits == 16, then
// RightShiftWithRounding_S16() is equal to RightShiftWithRounding() only for
// negative values.
TEST(CommonDspTest, SSE4RightShiftWithRoundingS16) {
for (int bits = 0; bits < 16; ++bits) {
const int bias = (1 << bits) >> 1;
for (int32_t value = INT16_MIN; value <= INT16_MAX; ++value) {
const __m128i v_val_d = _mm_set1_epi16(value);
const __m128i v_result_d = RightShiftWithRounding_S16(v_val_d, bits);
const int16_t result = _mm_extract_epi16(v_result_d, 0);
const int32_t expected = RightShiftWithRounding(value, bits);
if (value <= INT16_MAX - bias) {
EXPECT_EQ(result, expected) << "value: " << value << ", bits: " << bits;
} else {
EXPECT_EQ(expected, 1 << (15 - bits));
EXPECT_EQ(result, -expected)
<< "value: " << value << ", bits: " << bits;
}
}
}
}
} // namespace
} // namespace dsp
} // namespace libgav1
#else // !LIBGAV1_TARGETING_SSE4_1
TEST(CommonDspTest, SSE4) {
GTEST_SKIP() << "Build this module for x86(-64) with SSE4 enabled to enable "
"the tests.";
}
#endif // LIBGAV1_TARGETING_SSE4_1
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