66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
/*
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* 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
|