Add graph intrinsics for many math library functions:

runtime/vm/intrinsifier.cc

Index: runtime/vm/intrinsifier.cc
diff --git a/runtime/vm/intrinsifier.cc b/runtime/vm/intrinsifier.cc
index af15e7a7f2a81df0e199b6cf7518a5bc31da34a0..364004a2a624bb6470065b374e9e5dd30df83ef2 100644
--- a/runtime/vm/intrinsifier.cc
+++ b/runtime/vm/intrinsifier.cc
@@ -21,16 +21,39 @@
 namespace dart {
 
 DEFINE_FLAG(bool, intrinsify, true, "Instrinsify when possible");
+DEFINE_FLAG(bool, trace_intrinsifier, false, "Trace intrinsifier");
 DECLARE_FLAG(bool, code_comments);
 DECLARE_FLAG(bool, print_flow_graph);
 DECLARE_FLAG(bool, print_flow_graph_optimized);
 
 bool Intrinsifier::CanIntrinsify(const Function& function) {
+  if (FLAG_trace_intrinsifier) {
+    THR_Print("CanIntrinsify %s ->", function.ToQualifiedCString());
+  }
   if (!FLAG_intrinsify) return false;
-  if (function.IsClosureFunction()) return false;
+  if (function.IsClosureFunction()) {
+    if (FLAG_trace_intrinsifier) {
+      THR_Print("No, closure function.\n");
+    }
+    return false;
+  }
   // Can occur because of compile-all flag.
-  if (function.is_external()) return false;
-  return function.is_intrinsic();
+  if (function.is_external()) {
+    if (FLAG_trace_intrinsifier) {
+      THR_Print("No, external function.\n");
+    }
+    return false;
+  }
+  if (!function.is_intrinsic()) {
+    if (FLAG_trace_intrinsifier) {
+      THR_Print("No, not intrinsic function.\n");
+    }
+    return false;
+  }
+  if (FLAG_trace_intrinsifier) {
+    THR_Print("Yes.\n");
+  }
+  return true;
 }
 
 
@@ -78,6 +101,7 @@ void Intrinsifier::InitializeState() {
   lib = Library::MathLibrary();
   ASSERT(!lib.IsNull());
   MATH_LIB_INTRINSIC_LIST(SETUP_FUNCTION);
+  GRAPH_MATH_LIB_INTRINSIC_LIST(SETUP_FUNCTION);
 
   // Set up all dart:typed_data lib functions that can be intrinsified.
   lib = Library::TypedDataLibrary();
@@ -94,12 +118,11 @@ void Intrinsifier::InitializeState() {
 }
 #endif  // defined(DART_NO_SNAPSHOT).
 
-
 static void EmitCodeFor(FlowGraphCompiler* compiler,
                         FlowGraph* graph) {
   // The FlowGraph here is constructed by the intrinsics builder methods, and
   // is different from compiler->flow_graph(), the original method's flow graph.
-  compiler->assembler()->Comment("Graph intrinsic");
+  compiler->assembler()->Comment("Graph intrinsic begin");
   for (intptr_t i = 0; i < graph->reverse_postorder().length(); i++) {
     BlockEntryInstr* block = graph->reverse_postorder()[i];
     if (block->IsGraphEntry()) continue;  // No code for graph entry needed.
@@ -115,6 +138,11 @@ static void EmitCodeFor(FlowGraphCompiler* compiler,
       if (instr->IsParallelMove()) {
         compiler->parallel_move_resolver()->EmitNativeCode(
             instr->AsParallelMove());
+      } else if (instr->IsInvokeMathCFunction()) {
+        ASSERT(instr->locs() != NULL);
+        Intrinsifier::IntrinsicCallPrologue(compiler->assembler());
+        instr->EmitNativeCode(compiler);
+        Intrinsifier::IntrinsicCallEpilogue(compiler->assembler());
       } else {
         ASSERT(instr->locs() != NULL);
         // Calls are not supported in intrinsics code.
@@ -123,6 +151,7 @@ static void EmitCodeFor(FlowGraphCompiler* compiler,
       }
     }
   }
+  compiler->assembler()->Comment("Graph intrinsic end");
 }
 
 
@@ -224,6 +253,11 @@ static intptr_t CidForRepresentation(Representation rep) {
 }
 
 
+// Notes about the graph intrinsics:
+//
+// IR instructions which would jump to a deoptimization sequence on failure
+// instead branch to the intrinsic slow path.
+//
 class BlockBuilder : public ValueObject {
  public:
   BlockBuilder(FlowGraph* flow_graph, TargetEntryInstr* entry)
@@ -269,17 +303,45 @@ class BlockBuilder : public ValueObject {
         new ConstantInstr(Object::ZoneHandle(Object::null())));
   }
 
-  Definition* AddUnboxInstr(Representation rep, Value* value) {
+  Definition* AddUnboxInstr(Representation rep,
+                            Value* value,
+                            bool is_checked) {
     Definition* unboxed_value = AddDefinition(
         UnboxInstr::Create(rep, value, Thread::kNoDeoptId));
-    // Manually adjust reaching type because there is no type propagation
-    // when building intrinsics.
-    unboxed_value->AsUnbox()->value()->SetReachingType(ZoneCompileType::Wrap(
-        CompileType::FromCid(CidForRepresentation(rep))));
+    if (is_checked) {
+      // The type of |value| has already been checked and it is safe to
+      // adjust reaching type. This is done manually because there is no type
+      // propagation when building intrinsics.
+      unboxed_value->AsUnbox()->value()->SetReachingType(ZoneCompileType::Wrap(
+          CompileType::FromCid(CidForRepresentation(rep))));
+    }
     return unboxed_value;
   }
 
+  Definition* AddUnboxInstr(Representation rep,
+                            Definition* boxed,
+                            bool is_checked) {
+    return AddUnboxInstr(rep, new Value(boxed), is_checked);
+  }
+
+  Definition* InvokeMathCFunction(MethodRecognizer::Kind recognized_kind,
+                                  ZoneGrowableArray<Value*>* args) {
+    return InvokeMathCFunctionHelper(recognized_kind, args);
+  }
+
  private:
+  Definition* InvokeMathCFunctionHelper(MethodRecognizer::Kind recognized_kind,
+                                        ZoneGrowableArray<Value*>* args) {
+    InvokeMathCFunctionInstr* invoke_math_c_function =
+        new InvokeMathCFunctionInstr(args,
+                                     Thread::kNoDeoptId,
+                                     recognized_kind,
+                                     TokenPos());
+    AddDefinition(invoke_math_c_function);
+    return invoke_math_c_function;
+  }
+
+
   FlowGraph* flow_graph_;
   BlockEntryInstr* entry_;
   Instruction* current_;
@@ -460,7 +522,9 @@ bool Intrinsifier::Build_Uint32ArraySetIndexed(FlowGraph* flow_graph) {
   PrepareIndexedOp(&builder, array, index, TypedData::length_offset());
 
   Definition* unboxed_value =
-      builder.AddUnboxInstr(kUnboxedUint32, new Value(value));
+      builder.AddUnboxInstr(kUnboxedUint32,
+                            new Value(value),
+                            /* is_checked = */ true);
 
   builder.AddInstruction(
       new StoreIndexedInstr(new Value(array),
@@ -528,7 +592,9 @@ bool Intrinsifier::Build_Float64ArraySetIndexed(FlowGraph* flow_graph) {
                           value_check,
                           builder.TokenPos()));
   Definition* double_value =
-      builder.AddUnboxInstr(kUnboxedDouble, new Value(value));
+      builder.AddUnboxInstr(kUnboxedDouble,
+                            new Value(value),
+                            /* is_checked = */ true);
 
   builder.AddInstruction(
       new StoreIndexedInstr(new Value(array),
@@ -596,10 +662,14 @@ static bool BuildBinaryFloat32x4Op(FlowGraph* flow_graph, Token::Kind kind) {
                           value_check,
                           builder.TokenPos()));
   Definition* left_simd =
-      builder.AddUnboxInstr(kUnboxedFloat32x4, new Value(left));
+      builder.AddUnboxInstr(kUnboxedFloat32x4,
+                            new Value(left),
+                            /* is_checked = */ true);
 
   Definition* right_simd =
-      builder.AddUnboxInstr(kUnboxedFloat32x4, new Value(right));
+      builder.AddUnboxInstr(kUnboxedFloat32x4,
+                            new Value(right),
+                            /* is_checked = */ true);
 
   Definition* unboxed_result = builder.AddDefinition(
       new BinaryFloat32x4OpInstr(kind,
@@ -638,7 +708,9 @@ static bool BuildFloat32x4Shuffle(FlowGraph* flow_graph,
   Definition* receiver = builder.AddParameter(1);
 
   Definition* unboxed_receiver =
-      builder.AddUnboxInstr(kUnboxedFloat32x4, new Value(receiver));
+      builder.AddUnboxInstr(kUnboxedFloat32x4,
+                            new Value(receiver),
+                            /* is_checked = */ true);
 
   Definition* unboxed_result = builder.AddDefinition(
       new Simd32x4ShuffleInstr(kind,
@@ -872,7 +944,9 @@ bool Intrinsifier::Build_DoubleFlipSignBit(FlowGraph* flow_graph) {
 
   Definition* receiver = builder.AddParameter(1);
   Definition* unboxed_value =
-      builder.AddUnboxInstr(kUnboxedDouble, new Value(receiver));
+      builder.AddUnboxInstr(kUnboxedDouble,
+                            new Value(receiver),
+                            /* is_checked = */ true);
   Definition* unboxed_result = builder.AddDefinition(
       new UnaryDoubleOpInstr(Token::kNEGATE,
                              new Value(unboxed_value),
@@ -883,4 +957,115 @@ bool Intrinsifier::Build_DoubleFlipSignBit(FlowGraph* flow_graph) {
   return true;
 }
 
+
+static bool BuildInvokeMathCFunction(BlockBuilder* builder,
+                                     MethodRecognizer::Kind kind,
+                                     intptr_t num_parameters = 1) {
+  ZoneGrowableArray<Value*>* args =
+      new ZoneGrowableArray<Value*>(num_parameters);
+
+  for (intptr_t i = 0; i < num_parameters; i++) {
+    const intptr_t parameter_index = (num_parameters - i);
+    Definition* value = builder->AddParameter(parameter_index);
+    Definition* unboxed_value =
+        builder->AddUnboxInstr(kUnboxedDouble, value, /* is_checked = */ false);
+    args->Add(new Value(unboxed_value));
+  }
+
+  Definition* unboxed_result =
+      builder->InvokeMathCFunction(kind, args);
+
+  Definition* result = builder->AddDefinition(
+      BoxInstr::Create(kUnboxedDouble, new Value(unboxed_result)));
+
+  builder->AddIntrinsicReturn(new Value(result));
+
+  return true;
+}
+
+
+bool Intrinsifier::Build_MathSin(FlowGraph* flow_graph) {
+  if (!FlowGraphCompiler::SupportsUnboxedDoubles()) return false;
+
+  GraphEntryInstr* graph_entry = flow_graph->graph_entry();
+  TargetEntryInstr* normal_entry = graph_entry->normal_entry();
+  BlockBuilder builder(flow_graph, normal_entry);
+
+  return BuildInvokeMathCFunction(&builder,
+                                  MethodRecognizer::kMathSin);
+}
+
+
+bool Intrinsifier::Build_MathCos(FlowGraph* flow_graph) {
+  if (!FlowGraphCompiler::SupportsUnboxedDoubles()) return false;
+
+  GraphEntryInstr* graph_entry = flow_graph->graph_entry();
+  TargetEntryInstr* normal_entry = graph_entry->normal_entry();
+  BlockBuilder builder(flow_graph, normal_entry);
+
+  return BuildInvokeMathCFunction(&builder,
+                                  MethodRecognizer::kMathCos);
+}
+
+
+bool Intrinsifier::Build_MathTan(FlowGraph* flow_graph) {
+  if (!FlowGraphCompiler::SupportsUnboxedDoubles()) return false;
+
+  GraphEntryInstr* graph_entry = flow_graph->graph_entry();
+  TargetEntryInstr* normal_entry = graph_entry->normal_entry();
+  BlockBuilder builder(flow_graph, normal_entry);
+
+  return BuildInvokeMathCFunction(&builder,
+                                  MethodRecognizer::kMathTan);
+}
+
+
+bool Intrinsifier::Build_MathAsin(FlowGraph* flow_graph) {
+  if (!FlowGraphCompiler::SupportsUnboxedDoubles()) return false;
+
+  GraphEntryInstr* graph_entry = flow_graph->graph_entry();
+  TargetEntryInstr* normal_entry = graph_entry->normal_entry();
+  BlockBuilder builder(flow_graph, normal_entry);
+
+  return BuildInvokeMathCFunction(&builder,
+                                  MethodRecognizer::kMathAsin);
+}
+
+
+bool Intrinsifier::Build_MathAcos(FlowGraph* flow_graph) {
+  if (!FlowGraphCompiler::SupportsUnboxedDoubles()) return false;
+
+  GraphEntryInstr* graph_entry = flow_graph->graph_entry();
+  TargetEntryInstr* normal_entry = graph_entry->normal_entry();
+  BlockBuilder builder(flow_graph, normal_entry);
+
+  return BuildInvokeMathCFunction(&builder,
+                                  MethodRecognizer::kMathAcos);
+}
+
+
+bool Intrinsifier::Build_MathAtan(FlowGraph* flow_graph) {
+  if (!FlowGraphCompiler::SupportsUnboxedDoubles()) return false;
+
+  GraphEntryInstr* graph_entry = flow_graph->graph_entry();
+  TargetEntryInstr* normal_entry = graph_entry->normal_entry();
+  BlockBuilder builder(flow_graph, normal_entry);
+
+  return BuildInvokeMathCFunction(&builder,
+                                  MethodRecognizer::kMathAtan);
+}
+
+
+bool Intrinsifier::Build_MathAtan2(FlowGraph* flow_graph) {
+  if (!FlowGraphCompiler::SupportsUnboxedDoubles()) return false;
+
+  GraphEntryInstr* graph_entry = flow_graph->graph_entry();
+  TargetEntryInstr* normal_entry = graph_entry->normal_entry();
+  BlockBuilder builder(flow_graph, normal_entry);
+
+  return BuildInvokeMathCFunction(&builder,
+                                  MethodRecognizer::kMathAtan2,
+                                  /* num_parameters = */ 2);
+}
+
 }  // namespace dart