[CINN] Update compute at dependency graph (#71111)

Dmovic · web-flow · commit f162e99cb96a · 2025-02-13T17:18:28.000+08:00
diff --git a/paddle/cinn/ir/group_schedule/tactic/compute_at_reduction_tactic.cc b/paddle/cinn/ir/group_schedule/tactic/compute_at_reduction_tactic.cc
@@ -13,8 +13,10 @@
 // limitations under the License.
 
 #include "paddle/cinn/ir/group_schedule/tactic/compute_at_reduction_tactic.h"
+#include "paddle/cinn/ir/ir_analyzer/data_dependency_graph.h"
 #include "paddle/cinn/ir/ir_analyzer/ir_analyzer.h"
 #include "paddle/cinn/ir/utils/ir_compare.h"
+#include "paddle/cinn/ir/utils/stmt_converter.h"
 #include "paddle/cinn/optim/replace_var_with_expr.h"
 
 namespace cinn {
@@ -104,7 +106,6 @@ class ComputeAtReductionTactic final : public ScheduleTactic {
   // A copy of the IRSchedule and ScheduleBlockGraph, with all loop vars
   // unifiedly rewritten to the form `$<loop_index>` (e.g. $0, $1).
   std::unique_ptr<ir::IRSchedule> sch_;
-  std::unique_ptr<ir::ScheduleBlockGraph> graph_;
 
   // Cache of the results of GetUnifiedControlFlow, GetLoopVariantLoads,
   // GetSerialLoopExtent and IsReductionSBlock because these functions are too
@@ -241,7 +242,6 @@ void ComputeAtReductionTactic::Init(ScheduleContext* context,
   serial_loop_extent_.clear();
 
   sch_ = std::make_unique<ir::IRSchedule>(*sch);
-  graph_ = std::make_unique<ir::ScheduleBlockGraph>(*sch_);
 
   for (auto& block : sch_->GetAllBlocks()) {
     // Replace loop_vars to the unified form `$<loop_index>`
@@ -373,10 +373,8 @@ std::vector<std::string>
 ComputeAtReductionTactic::GetDependencyHarzardFreeBlocks(
     ir::IRSchedule* sch, const std::string& block_id) {
   std::vector<std::string> results;
-  std::vector<ir::Expr> blocks = sch->GetAllBlocks();
-  auto* graph_node = graph_->RetrieveNode(block_id);
-  std::unordered_set<std::string> upstreams = graph_node->UpstreamNodes();
-  std::unordered_set<std::string> downstreams = graph_node->DownstreamNodes();
+  std::vector<stmt::StmtRef> stmts = sch->GetAllSchedules();
+  analyzer::DataDependencyGraph dep_graph(stmts);
 
   // Find the position of the current block in the graph, then search upwards
   // and downwards until a denepency harzard is met.
@@ -397,25 +395,25 @@ ComputeAtReductionTactic::GetDependencyHarzardFreeBlocks(
   // C has denepency harzard with B because it directly depends on B. C also has
   // dependency harzard with A, because if we move C to the position of A, we
   // will violate the dependency of B->C. C is only harzard-free with D and E.
-  auto this_it =
-      std::find_if(blocks.begin(), blocks.end(), [&](const ir::Expr& block) {
-        return analyzer::GetBlockName(block) == block_id;
+  auto this_it = std::find_if(
+      stmts.begin(), stmts.end(), [&](const ir::stmt::StmtRef& stmt) {
+        return stmt.as<stmt::Schedule>()->name() == block_id;
       });
 
   // Search upwards
   auto this_it_rev = std::make_reverse_iterator(this_it);
-  for (auto it = this_it_rev; it != blocks.rend(); ++it) {
-    std::string other_id = analyzer::GetBlockName(*it);
+  for (auto it = this_it_rev; it != stmts.rend(); ++it) {
+    std::string other_id = (*it).as<stmt::Schedule>()->name();
     // As a special case, we can ignore the `reduce_init` in front of Reduce.
     if (IsReduceInitTensorName(other_id)) continue;
-    if (upstreams.count(other_id) > 0) break;
+    if (dep_graph.HasDependency(*it, *this_it) == analyzer::DepKind::DEP) break;
     results.push_back(other_id);
   }
 
   // Search downwards
-  for (auto it = this_it + 1; it != blocks.end(); ++it) {
-    std::string other_id = analyzer::GetBlockName(*it);
-    if (downstreams.count(other_id) > 0) break;
+  for (auto it = this_it + 1; it != stmts.end(); ++it) {
+    std::string other_id = (*it).as<stmt::Schedule>()->name();
+    if (dep_graph.HasDependency(*this_it, *it) == analyzer::DepKind::DEP) break;
     results.push_back(other_id);
   }
 
diff --git a/paddle/cinn/ir/ir_analyzer/ir_analyzer.cc b/paddle/cinn/ir/ir_analyzer/ir_analyzer.cc
@@ -34,6 +34,7 @@
 #include "paddle/cinn/ir/schedule/schedule_desc.h"
 #include "paddle/cinn/ir/tensor.h"
 #include "paddle/cinn/ir/utils/ir_nodes_collector.h"
+#include "paddle/cinn/ir/utils/stmt_converter.h"
 #include "paddle/cinn/utils/random_engine.h"
 #include "paddle/common/enforce.h"
 #include "paddle/fluid/platform/enforce.h"
@@ -110,6 +111,27 @@ std::vector<Expr> GetAllBlocks(const std::vector<Expr>& exprs) {
   return result;
 }
 
+std::vector<stmt::StmtRef> GetAllSchedules(const std::vector<Expr>& exprs) {
+  std::vector<stmt::StmtRef> result;
+  for (auto& it_expr : exprs) {
+    stmt::BlockRef stmt_block;
+    if (it_expr.As<ir::Block>()) {
+      stmt_block = ConvertExprBlockToStmtBlock(it_expr);
+    } else {
+      stmt_block = ConvertExprBlockToStmtBlock(
+          ir::Block::Make(std::vector<ir::Expr>{it_expr}));
+    }
+    FindSchedulesVisitor visitor;
+    auto find_blocks = visitor(stmt_block);
+    result.insert(result.end(), find_blocks.begin(), find_blocks.end());
+  }
+  PADDLE_ENFORCE_EQ(
+      result.empty(),
+      false,
+      ::common::errors::InvalidArgument("Didn't find schedules in expr."));
+  return result;
+}
+
 std::vector<Expr> GetChildBlocks(const Expr& expr) {
   if (!expr.As<ir::ScheduleBlockRealize>()) {
     PADDLE_ENFORCE_NOT_NULL(expr.As<ir::For>(),
diff --git a/paddle/cinn/ir/ir_analyzer/ir_analyzer.h b/paddle/cinn/ir/ir_analyzer/ir_analyzer.h
@@ -35,6 +35,8 @@ std::vector<Expr> GetLoops(const std::vector<Expr>& exprs, const Expr& block);
 
 std::vector<Expr> GetAllBlocks(const std::vector<Expr>& exprs);
 
+std::vector<stmt::StmtRef> GetAllSchedules(const std::vector<Expr>& exprs);
+
 std::vector<Expr> GetChildBlocks(const Expr& expr);
 
 Expr GetBlock(const std::vector<Expr>& exprs, const std::string& block_name);
diff --git a/paddle/cinn/ir/schedule/impl/base.cc b/paddle/cinn/ir/schedule/impl/base.cc
@@ -167,6 +167,15 @@ std::vector<Expr> DyScheduleImpl::GetAllBlocks() const {
   CINN_IR_SCHEDULE_END(this->err_msg_level_);
 }
 
+std::vector<stmt::StmtRef> DyScheduleImpl::GetAllSchedules() const {
+  CINN_IR_SCHEDULE_BEGIN();
+  std::string primitive = "GetAllSchedules";
+  std::ostringstream os;
+  auto exprs = module_expr_.GetExprs();
+  return analyzer::GetAllSchedules(exprs);
+  CINN_IR_SCHEDULE_END(this->err_msg_level_);
+}
+
 std::vector<Expr> DyScheduleImpl::GetChildBlocks(const Expr& expr) const {
   CINN_IR_SCHEDULE_BEGIN();
   std::string primitive = "GetChildBlocks";
diff --git a/paddle/cinn/ir/schedule/impl/ir_schedule.h b/paddle/cinn/ir/schedule/impl/ir_schedule.h
@@ -46,6 +46,7 @@ class DyScheduleImpl : public ScheduleBase {
   std::vector<Expr> GetLoops(const Expr& block) const;
   std::vector<Expr> GetLoops(const std::string& block_name) const;
   std::vector<Expr> GetAllBlocks() const;
+  std::vector<stmt::StmtRef> GetAllSchedules() const;
   std::vector<Expr> GetChildBlocks(const Expr& expr) const;
   Expr GetBlock(const std::string& block_name) const;
   std::vector<Expr> Split(const Expr& loop, const std::vector<int>& factors);
diff --git a/paddle/cinn/ir/schedule/ir_schedule.cc b/paddle/cinn/ir/schedule/ir_schedule.cc
@@ -354,6 +354,12 @@ std::vector<Expr> IRSchedule::GetAllBlocks() const {
   return results;
 }
 
+std::vector<stmt::StmtRef> IRSchedule::GetAllSchedules() const {
+  auto results = impl_->GetAllSchedules();
+  trace_.Append(ScheduleDesc::Step("GetAllSchedules", {}, {}, {}, results));
+  return results;
+}
+
 std::vector<Expr> IRSchedule::GetChildBlocks(const Expr& expr) const {
   auto results = impl_->GetChildBlocks(expr);
   trace_.Append(ScheduleDesc::Step(
diff --git a/paddle/cinn/ir/schedule/ir_schedule.h b/paddle/cinn/ir/schedule/ir_schedule.h
@@ -90,6 +90,9 @@ class IRSchedule {
   //! Get all blocks stored in this ModuleExpr.
   std::vector<Expr> GetAllBlocks() const;
 
+  //! Get all schedules stored in this ModuleExpr.
+  std::vector<stmt::StmtRef> GetAllSchedules() const;
+
   //! Get a block with the specific name.
   Expr GetBlock(const std::string& block_name) const;
 
diff --git a/paddle/cinn/ir/schedule/ir_schedule_util.h b/paddle/cinn/ir/schedule/ir_schedule_util.h
@@ -1180,6 +1180,48 @@ struct FindBlocksVisitor {
   std::vector<Expr> result{};
 };
 
+struct FindSchedulesVisitor {
+  explicit FindSchedulesVisitor(const std::string& schedule_name = "")
+      : schedule_name_(schedule_name) {}
+
+  std::vector<stmt::StmtRef> operator()(const stmt::BlockRef& block) {
+    VisitBlock(block);
+    return result;
+  }
+
+ private:
+  void VisitStmt(const stmt::StmtRef& stmt) {
+    if (!stmt.defined()) return;
+    if (!schedule_name_.empty() && !result.empty()) return;
+    if (stmt.isa<stmt::For>()) {
+      VisitBlock(stmt.as<stmt::For>()->body());
+    } else if (stmt.isa<stmt::Schedule>()) {
+      if (stmt.as<stmt::Schedule>()->name().substr(0, 4) != "root") {
+        auto schedule_block = stmt.as<stmt::Schedule>();
+        if (schedule_name_.empty() ||
+            schedule_block->name() == schedule_name_) {
+          result.emplace_back(stmt);
+        }
+      } else {
+        VisitBlock(stmt.as<stmt::Schedule>()->body());
+      }
+    } else if (stmt.isa<stmt::IfThenElse>()) {
+      VisitBlock(stmt.as<stmt::IfThenElse>()->true_case());
+      if (stmt.as<stmt::IfThenElse>()->false_case().defined())
+        VisitBlock(stmt.as<stmt::IfThenElse>()->false_case());
+    }
+  }
+
+  void VisitBlock(const stmt::BlockRef& block) {
+    for (const stmt::StmtRef& inner_stmt : block->stmts()) {
+      VisitStmt(inner_stmt);
+    }
+  }
+
+  std::string schedule_name_;
+  std::vector<stmt::StmtRef> result{};
+};
+
 struct FindLoopsVisitor {
   explicit FindLoopsVisitor(const Expr& block) : block_(block) {}
 
diff --git a/paddle/cinn/ir/schedule/schedule_base.h b/paddle/cinn/ir/schedule/schedule_base.h
@@ -108,6 +108,7 @@ class ScheduleBase {
   virtual std::vector<Expr> GetLoops(const Expr& block) const = 0;
   virtual std::vector<Expr> GetLoops(const std::string& block_name) const = 0;
   virtual std::vector<Expr> GetAllBlocks() const = 0;
+  virtual std::vector<stmt::StmtRef> GetAllSchedules() const = 0;
   virtual std::vector<Expr> GetChildBlocks(const Expr& expr) const = 0;
   virtual Expr GetBlock(const std::string& block_name) const = 0;
 
diff --git a/paddle/cinn/ir/schedule/schedule_desc.h b/paddle/cinn/ir/schedule/schedule_desc.h
@@ -21,6 +21,7 @@
 
 #include "paddle/cinn/ir/ir.h"
 #include "paddle/cinn/ir/schedule/schedule_desc.pb.h"
+#include "paddle/cinn/ir/stmt.h"
 #include "paddle/cinn/utils/registry.h"
 #include "paddle/cinn/utils/type_defs.h"
 
@@ -43,12 +44,23 @@ class ScheduleDesc {
     absl::flat_hash_map<std::string, std::vector<Expr>> inputs;
     utils::AttributeMap attrs;
     std::vector<Expr> outputs;
+    std::vector<stmt::StmtRef> stmt_outputs;
     Step() = default;
     Step(std::string type_i,
          absl::flat_hash_map<std::string, std::vector<Expr>> inputs_i,
          utils::AttributeMap attrs_i,
          std::vector<Expr> outputs_i)
         : type(type_i), inputs(inputs_i), attrs(attrs_i), outputs(outputs_i) {}
+    Step(std::string type_i,
+         absl::flat_hash_map<std::string, std::vector<Expr>> inputs_i,
+         utils::AttributeMap attrs_i,
+         std::vector<Expr> outputs_i,
+         std::vector<stmt::StmtRef> stmt_outputs_i)
+        : type(type_i),
+          inputs(inputs_i),
+          attrs(attrs_i),
+          outputs(outputs_i),
+          stmt_outputs(stmt_outputs_i) {}
   };
 
   /**
