Eliminate temporary locals for some expressions

runtime/vm/intermediate_language.cc

 // Copyright (c) 2013, 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/intermediate_language.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/bit_vector.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_allocator.h"
@@ skipping 1561 matching lines @@
 LocationSummary* StoreContextInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RegisterLocation(CTX));
   return summary;
 }
 
 
+LocationSummary* PushTempInstr::MakeLocationSummary() const {
+  return LocationSummary::Make(1,
+                               Location::NoLocation(),
+                               LocationSummary::kNoCall);
+}
+
+
+void PushTempInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  ASSERT(!compiler->is_optimizing());
+  // Nothing to do.
+}
+
+
+LocationSummary* DropTempsInstr::MakeLocationSummary() const {
+  return LocationSummary::Make(1,
+                               Location::SameAsFirstInput(),
+                               LocationSummary::kNoCall);
+}
+
+
+void DropTempsInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  ASSERT(!compiler->is_optimizing());
+  Register value = locs()->in(0).reg();
+  Register result = locs()->out().reg();
+  ASSERT(result == value);  // Assert that register assignment is correct.
+  __ Drop(num_temps());
+}
+
+
 void StoreContextInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // Nothing to do.  Context register was loaded by the register allocator.
   ASSERT(locs()->in(0).reg() == CTX);
 }
 
 
 StrictCompareInstr::StrictCompareInstr(intptr_t token_pos,
                                        Token::Kind kind,
                                        Value* left,
                                        Value* right)
@@ skipping 882 matching lines @@
     default:
       UNREACHABLE();
   }
   return kPowRuntimeEntry;
 }
 
 
 #undef __
 
 }  // namespace dart