81ddb09077
- By default, this backend is currently not enabled. PiperOrigin-RevId: 334898563 Change-Id: I07c8b24d3b66249afb6186f25bf3f51b0f632595
148 lines
4.6 KiB
C++
148 lines
4.6 KiB
C++
/* Copyright 2019 The TensorFlow Authors. All Rights Reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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#include "tensorflow/lite/kernels/cpu_backend_context.h"
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#include <memory>
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#ifdef TFLITE_HAVE_CPUINFO
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#include "include/cpuinfo.h"
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#endif
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#include "public/gemmlowp.h"
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#include "ruy/context.h" // from @ruy
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#include "tensorflow/lite/c/common.h"
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#include "tensorflow/lite/external_cpu_backend_context.h"
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#include "tensorflow/lite/kernels/internal/compatibility.h"
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#include "tensorflow/lite/kernels/op_macros.h"
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namespace {
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const int kDefaultNumThreadpoolThreads = 1;
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} // namespace
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namespace tflite {
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#ifdef TFLITE_HAVE_CPUINFO
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CpuBackendContext::CpuInfo::~CpuInfo() {
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if (init_status_ == InitStatus::kInitialized) {
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cpuinfo_deinitialize();
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}
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}
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bool CpuBackendContext::CpuInfo::EnsureInitialized() {
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if (init_status_ == InitStatus::kNotYetAttempted) {
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init_status_ = Initialize();
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}
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return init_status_ == InitStatus::kInitialized;
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}
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CpuBackendContext::CpuInfo::InitStatus
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CpuBackendContext::CpuInfo::Initialize() {
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TFLITE_DCHECK_EQ(init_status_, InitStatus::kNotYetAttempted);
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if (!cpuinfo_initialize()) {
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return InitStatus::kFailed;
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}
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return InitStatus::kInitialized;
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}
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bool CpuBackendContext::CpuInfo::Avx2Fma() {
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return EnsureInitialized() && cpuinfo_has_x86_avx2() &&
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cpuinfo_has_x86_fma3();
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}
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bool CpuBackendContext::CpuInfo::Avx() {
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return EnsureInitialized() && cpuinfo_has_x86_avx();
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}
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bool CpuBackendContext::CpuInfo::Avx512() {
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return EnsureInitialized() && cpuinfo_has_x86_avx512f() &&
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cpuinfo_has_x86_avx512dq() && cpuinfo_has_x86_avx512cd() &&
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cpuinfo_has_x86_avx512bw() && cpuinfo_has_x86_avx512vl();
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}
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#else
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CpuBackendContext::CpuInfo::~CpuInfo() {}
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bool CpuBackendContext::CpuInfo::EnsureInitialized() {
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if (init_status_ == InitStatus::kNotYetAttempted) {
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init_status_ = InitStatus::kInitialized;
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}
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TFLITE_DCHECK_EQ(init_status_, InitStatus::kInitialized);
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return true;
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}
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bool CpuBackendContext::CpuInfo::Avx2Fma() { return false; }
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bool CpuBackendContext::CpuInfo::Avx() { return false; }
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bool CpuBackendContext::CpuInfo::Avx512() { return false; }
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#endif // TFLITE_HAVE_CPUINFO
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CpuBackendContext* CpuBackendContext::GetFromContext(TfLiteContext* context) {
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auto* external_context = static_cast<ExternalCpuBackendContext*>(
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context->GetExternalContext(context, kTfLiteCpuBackendContext));
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if (external_context == nullptr) {
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TF_LITE_FATAL(
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"ExternalCpuBackendContext isn't properly initialized during TFLite "
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"interpreter initialization.");
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}
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auto* cpu_backend_context = static_cast<CpuBackendContext*>(
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external_context->internal_backend_context());
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if (cpu_backend_context == nullptr) {
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// We do the lazy initialization here for the TfLiteInternalBackendContext
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// that's wrapped inside ExternalCpuBackendContext.
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cpu_backend_context = new CpuBackendContext();
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cpu_backend_context->SetMaxNumThreads(context->recommended_num_threads);
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external_context->set_internal_backend_context(
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std::unique_ptr<TfLiteInternalBackendContext>(cpu_backend_context));
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}
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return cpu_backend_context;
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}
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CpuBackendContext::CpuBackendContext()
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: TfLiteInternalBackendContext(),
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ruy_context_(new ruy::Context),
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gemmlowp_context_(new gemmlowp::GemmContext) {
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SetMaxNumThreads(kDefaultNumThreadpoolThreads);
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// TODO(b/148289189) Remove when clients have transitioned to runtime flag.
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#ifdef TFLITE_WITH_RUY_GEMV
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SetUseCaching(true);
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#else
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SetUseCaching(false);
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#endif
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}
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CpuBackendContext::~CpuBackendContext() {}
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void CpuBackendContext::SetMaxNumThreads(int max_num_threads) {
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const int target_num_threads =
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max_num_threads > -1 ? max_num_threads : kDefaultNumThreadpoolThreads;
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max_num_threads_ = target_num_threads;
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ruy_context_->set_max_num_threads(target_num_threads);
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gemmlowp_context_->set_max_num_threads(target_num_threads);
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}
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void CpuBackendContext::SetUseCaching(bool flag) { use_caching_ = flag; }
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bool CpuBackendContext::HasAvxOrAbove() {
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return cpuinfo_.Avx() || cpuinfo_.Avx2Fma() || cpuinfo_.Avx512();
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}
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} // namespace tflite
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