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Paddle/paddle/utils/CpuId.h

101 lines
2.5 KiB

/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
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 "Common.h"
namespace paddle {
// clang-format off
enum simd_t {
SIMD_NONE = 0, ///< None
SIMD_SSE = 1 << 0, ///< SSE
SIMD_SSE2 = 1 << 1, ///< SSE 2
SIMD_SSE3 = 1 << 2, ///< SSE 3
SIMD_SSSE3 = 1 << 3, ///< SSSE 3
SIMD_SSE41 = 1 << 4, ///< SSE 4.1
SIMD_SSE42 = 1 << 5, ///< SSE 4.2
SIMD_FMA3 = 1 << 6, ///< FMA 3
SIMD_FMA4 = 1 << 7, ///< FMA 4
SIMD_AVX = 1 << 8, ///< AVX
SIMD_AVX2 = 1 << 9, ///< AVX 2
SIMD_AVX512 = 1 << 10, ///< AVX 512
};
// clang-format on
class SIMDFlags final {
public:
DISABLE_COPY(SIMDFlags);
SIMDFlags();
static SIMDFlags const* instance();
inline bool check(int flags) const {
return !((simd_flags_ & flags) ^ flags);
}
private:
int simd_flags_ = SIMD_NONE;
};
/**
* @brief Check SIMD flags at runtime.
*
* For example.
* @code{.cpp}
*
* if (HAS_SIMD(SIMD_AVX2 | SIMD_FMA4)) {
* avx2_fm4_stub();
* } else if (HAS_SIMD(SIMD_AVX)) {
* avx_stub();
* }
*
* @endcode
*/
#define HAS_SIMD(__flags) SIMDFlags::instance()->check(__flags)
/**
* @brief Check SIMD flags at runtime.
*
* 1. Check all SIMD flags at runtime:
*
* @code{.cpp}
* if (HAS_AVX && HAS_AVX2) {
* avx2_stub();
* }
* @endcod
*
* 2. Check one SIMD flag at runtime:
*
* @code{.cpp}
* if (HAS_SSE41 || HAS_SSE42) {
* sse4_stub();
* }
* @endcode
*/
// clang-format off
#define HAS_SSE HAS_SIMD(SIMD_SSE)
#define HAS_SSE2 HAS_SIMD(SIMD_SSE2)
#define HAS_SSE3 HAS_SIMD(SIMD_SSE3)
#define HAS_SSSE3 HAS_SIMD(SIMD_SSSE3)
#define HAS_SSE41 HAS_SIMD(SIMD_SSE41)
#define HAS_SSE42 HAS_SIMD(SIMD_SSE42)
#define HAS_FMA3 HAS_SIMD(SIMD_FMA3)
#define HAS_FMA4 HAS_SIMD(SIMD_FMA4)
#define HAS_AVX HAS_SIMD(SIMD_AVX)
#define HAS_AVX2 HAS_SIMD(SIMD_AVX2)
#define HAS_AVX512 HAS_SIMD(SIMD_AVX512)
// clang-format on
} // namespace paddle