Inline toDouble calls on mints

runtime/vm/intermediate_language_ia32.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/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 4837 matching lines @@
 
 
 void SmiToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
   FpuRegister result = locs()->out(0).fpu_reg();
   __ SmiUntag(value);
   __ cvtsi2sd(result, value);
 }
 
 
+LocationSummary* MintToDoubleInstr::MakeLocationSummary(Isolate* isolate,
+                                                        bool opt) const {
+  const intptr_t kNumInputs = 1;
+  const intptr_t kNumTemps = 0;
+  LocationSummary* result = new(isolate) LocationSummary(
+      isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  result->set_in(0, Location::Pair(Location::RequiresRegister(),
+                                   Location::RequiresRegister()));
+  result->set_out(0, Location::RequiresFpuRegister());
+  return result;
+}
+
+
+void MintToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  PairLocation* pair = locs()->in(0).AsPairLocation();
+  Register in_lo = pair->At(0).reg();
+  Register in_hi = pair->At(1).reg();
+
+  FpuRegister result = locs()->out(0).fpu_reg();
+
+  // Push hi.
+  __ pushl(in_hi);
+  // Push lo.
+  __ pushl(in_lo);
+  // Perform conversion from Mint to double.
+  __ fildl(Address(ESP, 0));
+  // Pop FPU stack onto regular stack.
+  __ fstpl(Address(ESP, 0));
+  // Copy into result.
+  __ movsd(result, Address(ESP, 0));
+  // Pop args.
+  __ addl(ESP, Immediate(2 * kWordSize));
+}
+
+
 LocationSummary* DoubleToIntegerInstr::MakeLocationSummary(Isolate* isolate,
                                                            bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* result = new(isolate) LocationSummary(
       isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
   result->set_in(0, Location::RegisterLocation(ECX));
   result->set_out(0, Location::RegisterLocation(EAX));
   return result;
 }
@@ skipping 1877 matching lines @@
   __ movl(EDX, Immediate(kInvalidObjectPointer));
   __ movl(EDX, Immediate(kInvalidObjectPointer));
 #endif
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_IA32