| /*! |
| * Copyright (c) 2018 by Contributors |
| * \file feature_visitor.cc |
| * \brief Base class for feature extractor. |
| * These features are used for machine learning cost model |
| */ |
| |
| #include "feature_visitor.h" |
| |
| namespace tvm { |
| namespace autotvm { |
| |
| // for loop |
| void FeatureVisitor::Visit_(const For *op) { |
| const auto *extent = op->extent.as<IntImm>(); |
| int64_t loop_extent = -1; |
| if (extent != nullptr) |
| loop_extent = extent->value; |
| AnnotationType ann = kSerial; |
| switch (op->for_type) { |
| case ForType ::Parallel: |
| ann = kParallel; |
| break; |
| case ForType::Unrolled: |
| ann = kUnrolled; |
| break; |
| case ForType::Vectorized: |
| ann = kVectorized; |
| break; |
| case ForType::Serial: |
| ann = kSerial; |
| break; |
| } |
| |
| if (EnterItervar_(op->loop_var, loop_extent, ann)) { |
| IRVisitor::Visit_(op); |
| ExitItervar_(); |
| } |
| } |
| |
| // parallel axis, virtual thread |
| void FeatureVisitor::Visit_(const AttrStmt *op) { |
| if (op->attr_key == attr::thread_extent || |
| op->attr_key == attr::virtual_thread) { |
| VarExpr var = op->node.as<tvm::IterVarNode>()->var; |
| const auto *extent = op->value.as<IntImm>(); |
| CHECK(extent); |
| |
| std::string name = var.get()->name_hint; |
| AnnotationType ann = kParallel; |
| if (op->attr_key == attr::thread_extent) { |
| if (name == "blockIdx.x") |
| ann = kBlockX; |
| else if (name == "blockIdx.y") |
| ann = kBlockY; |
| else if (name == "blockIdx.z") |
| ann = kBlockZ; |
| else if (name == "threadIdx.x") |
| ann = kThreadX; |
| else if (name == "threadIdx.y") |
| ann = kThreadY; |
| else if (name == "threadIdx.z") |
| ann = kThreadZ; |
| else |
| LOG(FATAL) << "invalid thread itervar " + name; |
| } else { |
| ann = kVirtualThread; |
| } |
| |
| if (EnterItervar_(var, extent->value, ann)) { |
| IRVisitor::Visit_(op); |
| ExitItervar_(); |
| } |
| } else { |
| IRVisitor::Visit_(op); |
| } |
| } |
| |
| // memory access |
| void FeatureVisitor::Visit_(const Load *op) { |
| EnterMem_(op->buffer_var, op->index); |
| IRVisitor::Visit_(op); |
| ExitMem_(); |
| } |
| |
| void FeatureVisitor::Visit_(const Store *op) { |
| EnterMem_(op->buffer_var, op->index); |
| IRVisitor::Visit_(op); |
| ExitMem_(); |
| } |
| |
| } // namespace autotvm |
| } // namespace tvm |