DBC: UnboxedConstantInstr

runtime/vm/flow_graph_compiler_dbc.cc

 // Copyright (c) 2016, 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_DBC.
 #if defined(TARGET_ARCH_DBC)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 409 matching lines @@
   const Location source = move->src();
   const Location destination = move->dest();
   if (source.IsStackSlot() && destination.IsRegister()) {
     // Only allow access to the arguments.
     ASSERT(source.base_reg() == FPREG);
     ASSERT(source.stack_index() < 0);
     __ Move(destination.reg(), -kParamEndSlotFromFp + source.stack_index());
   } else if (source.IsRegister() && destination.IsRegister()) {
     __ Move(destination.reg(), source.reg());
   } else if (source.IsConstant() && destination.IsRegister()) {
-    __ LoadConstant(destination.reg(), source.constant());
+    if (source.constant_instruction()->representation() == kUnboxedDouble) {
+      const Register result = destination.reg();
+      const Object& constant = source.constant();
+      if (Utils::DoublesBitEqual(Double::Cast(constant).value(), 0.0)) {
+        __ BitXor(result, result, result);
+      } else {
+        __ LoadConstant(result, constant);
+        __ UnboxDouble(result, result);
+      }
+    } else {
+      __ LoadConstant(destination.reg(), source.constant());
+    }
   } else {
     compiler_->Bailout("Unsupported move");
     UNREACHABLE();
   }
 
   move->Eliminate();
 }
 
 
 void ParallelMoveResolver::EmitSwap(int index) {
@@ skipping 79 matching lines @@
 void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
   UNIMPLEMENTED();
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_DBC