Generate smaller unoptimized code for certain 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/cpu.h"
 #include "vm/dart_entry.h"
@@ skipping 2044 matching lines @@
 }
 
 
 void PushTempInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(!compiler->is_optimizing());
   // Nothing to do.
 }
 
 
 LocationSummary* DropTempsInstr::MakeLocationSummary(bool optimizing) const {
-  return LocationSummary::Make(1,
-                               Location::SameAsFirstInput(),
-                               LocationSummary::kNoCall);
+  return (InputCount() != 0)
+      ? LocationSummary::Make(1,
+                              Location::SameAsFirstInput(),
+                              LocationSummary::kNoCall)
+      : LocationSummary::Make(0,
+                              Location::NoLocation(),
+                              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.
+  // Assert that register assignment is correct.
+  ASSERT((InputCount() == 0) || locs()->out().reg() == locs()->in(0).reg());
   __ 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);
 }
 
 
@@ skipping 1146 matching lines @@
     case Token::kTRUNCDIV: return 0;
     case Token::kMOD: return 1;
     default: UNIMPLEMENTED(); return -1;
   }
 }
 
 
 #undef __
 
 }  // namespace dart