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