[turbofan] Allow tests to enable/disable instruction scheduling.

src/compiler/instruction-selector.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/instruction-selector.h"
 
 #include <limits>
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/pipeline.h"
 #include "src/compiler/schedule.h"
 #include "src/compiler/state-values-utils.h"
 #include "src/deoptimizer.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 InstructionSelector::InstructionSelector(
     Zone* zone, size_t node_count, Linkage* linkage,
     InstructionSequence* sequence, Schedule* schedule,
     SourcePositionTable* source_positions, Frame* frame,
-    SourcePositionMode source_position_mode, Features features)
+    SourcePositionMode source_position_mode, Features features,
+    EnableScheduling enable_scheduling)
     : zone_(zone),
       linkage_(linkage),
       sequence_(sequence),
       source_positions_(source_positions),
       source_position_mode_(source_position_mode),
       features_(features),
       schedule_(schedule),
       current_block_(nullptr),
       instructions_(zone),
       defined_(node_count, false, zone),
       used_(node_count, false, zone),
       effect_level_(node_count, 0, zone),
       virtual_registers_(node_count,
                          InstructionOperand::kInvalidVirtualRegister, zone),
       scheduler_(nullptr),
+      enable_scheduling_(enable_scheduling),
       frame_(frame) {
   instructions_.reserve(node_count);
 }
 
 
 void InstructionSelector::SelectInstructions() {
   // Mark the inputs of all phis in loop headers as used.
   BasicBlockVector* blocks = schedule()->rpo_order();
   for (auto const block : *blocks) {
     if (!block->IsLoopHeader()) continue;
     DCHECK_LE(2u, block->PredecessorCount());
     for (Node* const phi : *block) {
       if (phi->opcode() != IrOpcode::kPhi) continue;
 
       // Mark all inputs as used.
       for (Node* const input : phi->inputs()) {
         MarkAsUsed(input);
       }
     }
   }
 
   // Visit each basic block in post order.
   for (auto i = blocks->rbegin(); i != blocks->rend(); ++i) {
     VisitBlock(*i);
   }
 
   // Schedule the selected instructions.
-  if (FLAG_turbo_instruction_scheduling &&
-      InstructionScheduler::SchedulerSupported()) {
+  if (UseInstructionScheduling()) {
     scheduler_ = new (zone()) InstructionScheduler(zone(), sequence());
   }
 
   for (auto const block : *blocks) {
     InstructionBlock* instruction_block =
         sequence()->InstructionBlockAt(RpoNumber::FromInt(block->rpo_number()));
     size_t end = instruction_block->code_end();
     size_t start = instruction_block->code_start();
     DCHECK_LE(end, start);
     StartBlock(RpoNumber::FromInt(block->rpo_number()));
     while (start-- > end) {
       AddInstruction(instructions_[start]);
     }
     EndBlock(RpoNumber::FromInt(block->rpo_number()));
   }
 #if DEBUG
   sequence()->ValidateSSA();
 #endif
 }
 
 void InstructionSelector::StartBlock(RpoNumber rpo) {
-  if (FLAG_turbo_instruction_scheduling &&
-      InstructionScheduler::SchedulerSupported()) {
+  if (UseInstructionScheduling()) {
     DCHECK_NOT_NULL(scheduler_);
     scheduler_->StartBlock(rpo);
   } else {
     sequence()->StartBlock(rpo);
   }
 }
 
 
 void InstructionSelector::EndBlock(RpoNumber rpo) {
-  if (FLAG_turbo_instruction_scheduling &&
-      InstructionScheduler::SchedulerSupported()) {
+  if (UseInstructionScheduling()) {
     DCHECK_NOT_NULL(scheduler_);
     scheduler_->EndBlock(rpo);
   } else {
     sequence()->EndBlock(rpo);
   }
 }
 
 
 void InstructionSelector::AddInstruction(Instruction* instr) {
-  if (FLAG_turbo_instruction_scheduling &&
-      InstructionScheduler::SchedulerSupported()) {
+  if (UseInstructionScheduling()) {
     DCHECK_NOT_NULL(scheduler_);
     scheduler_->AddInstruction(instr);
   } else {
     sequence()->AddInstruction(instr);
   }
 }
 
 
 Instruction* InstructionSelector::Emit(InstructionCode opcode,
                                        InstructionOperand output,
@@ skipping 1954 matching lines @@
   return new (instruction_zone()) FrameStateDescriptor(
       instruction_zone(), state_info.type(), state_info.bailout_id(),
       state_info.state_combine(), parameters, locals, stack,
       state_info.shared_info(), outer_state);
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8