66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
/*
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* Copyright 2018-present Facebook, Inc.
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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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*/
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#pragma once
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#include <folly/Portability.h>
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// F14 has been implemented for SSE2 and NEON (so far).
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//
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// This platform detection is a bit of a mess because it combines the
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// detection of supported platforms (FOLLY_SSE >= 2 || FOLLY_NEON) with
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// the selection of platforms on which we want to use it.
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//
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// Currently no 32-bit ARM versions are desired because we don't want to
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// need a separate build for chips that don't have NEON. AARCH64 support
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// is enabled for non-mobile platforms, but on mobile platforms there
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// are downstream iteration order effects that have not yet been resolved.
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//
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// If FOLLY_F14_VECTOR_INTRINSICS_AVAILABLE differs across compilation
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// units the program will fail to link due to a missing definition of
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// folly::container::detail::F14LinkCheck<X>::check() for some X.
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#if (FOLLY_SSE >= 2 || (FOLLY_NEON && FOLLY_AARCH64)) && !FOLLY_MOBILE
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#define FOLLY_F14_VECTOR_INTRINSICS_AVAILABLE 1
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#else
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#define FOLLY_F14_VECTOR_INTRINSICS_AVAILABLE 0
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#endif
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#if FOLLY_SSE_PREREQ(4, 2) || __ARM_FEATURE_CRC32
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#define FOLLY_F14_CRC_INTRINSIC_AVAILABLE 1
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#else
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#define FOLLY_F14_CRC_INTRINSIC_AVAILABLE 0
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#endif
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namespace folly {
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namespace f14 {
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namespace detail {
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enum class F14IntrinsicsMode { None, Simd, SimdAndCrc };
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static constexpr F14IntrinsicsMode getF14IntrinsicsMode() {
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#if !FOLLY_F14_VECTOR_INTRINSICS_AVAILABLE
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return F14IntrinsicsMode::None;
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#elif !FOLLY_F14_CRC_INTRINSIC_AVAILABLE
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return F14IntrinsicsMode::Simd;
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#else
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return F14IntrinsicsMode::SimdAndCrc;
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#endif
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}
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} // namespace detail
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} // namespace f14
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} // namespace folly
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