Add fast Smi op version of switchable instance calls.

runtime/vm/flow_graph_compiler_arm64.cc

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 1239 matching lines @@
     intptr_t token_pos,
     LocationSummary* locs) {
   const String& name = String::Handle(zone(), ic_data.target_name());
   const Array& arguments_descriptor =
       Array::ZoneHandle(zone(), ic_data.arguments_descriptor());
   ASSERT(!arguments_descriptor.IsNull() && (arguments_descriptor.Length() > 0));
   const MegamorphicCache& cache = MegamorphicCache::ZoneHandle(zone(),
       MegamorphicCacheTable::Lookup(isolate(), name, arguments_descriptor));
 
   __ Comment("MegamorphicCall");
-  __ LoadFromOffset(R0, SP, (argument_count - 1) * kWordSize);
+  __ LoadFromOffset(R1, SP, (argument_count - 1) * kWordSize);
   __ LoadObject(R5, cache);
   if (FLAG_use_megamorphic_stub) {
     __ BranchLink(*StubCode::MegamorphicLookup_entry());
   } else  {
     StubCode::EmitMegamorphicLookup(assembler());
   }
   __ blr(R1);
 
   AddCurrentDescriptor(RawPcDescriptors::kOther,
       Thread::kNoDeoptId, token_pos);
@@ skipping 10 matching lines @@
 }
 
 
 void FlowGraphCompiler::EmitSwitchableInstanceCall(
     const ICData& ic_data,
     intptr_t argument_count,
     intptr_t deopt_id,
     intptr_t token_pos,
     LocationSummary* locs) {
   __ Comment("SwitchableCall");
-  __ LoadFromOffset(R0, SP, (argument_count - 1) * kWordSize);
+  __ LoadFromOffset(R1, SP, (argument_count - 1) * kWordSize);
   if (ic_data.NumArgsTested() == 1) {
     __ LoadUniqueObject(R5, ic_data);
     __ BranchLinkPatchable(*StubCode::ICLookup_entry());
   } else {
     const String& name = String::Handle(zone(), ic_data.target_name());
-    const Array& arguments_descriptor =
-        Array::ZoneHandle(zone(), ic_data.arguments_descriptor());
-    ASSERT(!arguments_descriptor.IsNull() &&
-           (arguments_descriptor.Length() > 0));
-    const MegamorphicCache& cache = MegamorphicCache::ZoneHandle(zone(),
-        MegamorphicCacheTable::Lookup(isolate(), name, arguments_descriptor));
 
-    __ LoadUniqueObject(R5, cache);
-    __ BranchLinkPatchable(*StubCode::MegamorphicLookup_entry());
+    if (name.raw() == Symbols::Plus().raw()) {
+      __ LoadUniqueObject(R5, ic_data);
+      __ BranchLinkPatchable(*StubCode::ICSmiAddLookup_entry());
+    } else if (name.raw() == Symbols::Minus().raw()) {
+      __ LoadUniqueObject(R5, ic_data);
+      __ BranchLinkPatchable(*StubCode::ICSmiSubLookup_entry());
+    } else if (name.raw() == Symbols::Equals().raw()) {
+      __ LoadUniqueObject(R5, ic_data);
+      __ BranchLinkPatchable(*StubCode::ICSmiEqualLookup_entry());
+    } else {
+      const Array& arguments_descriptor =
+          Array::ZoneHandle(zone(), ic_data.arguments_descriptor());
+      ASSERT(!arguments_descriptor.IsNull() &&
+             (arguments_descriptor.Length() > 0));
+      const MegamorphicCache& cache = MegamorphicCache::ZoneHandle(zone(),
+          MegamorphicCacheTable::Lookup(isolate(), name, arguments_descriptor));
+
+      __ LoadUniqueObject(R5, cache);
+      __ BranchLinkPatchable(*StubCode::MegamorphicLookup_entry());
+    }
   }
-  __ blr(R1);
+  __ blr(R1);  // A fast Smi operation may return past this call.
 
   AddCurrentDescriptor(RawPcDescriptors::kOther,
       Thread::kNoDeoptId, token_pos);
   RecordSafepoint(locs);
   const intptr_t deopt_id_after = Thread::ToDeoptAfter(deopt_id);
   if (is_optimizing()) {
     AddDeoptIndexAtCall(deopt_id_after, token_pos);
   } else {
     // Add deoptimization continuation point after the call and before the
     // arguments are removed.
@@ skipping 539 matching lines @@
 void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
   __ PopDouble(reg);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64