Refactor to support multiple outputs in location summary

runtime/vm/intermediate_language_arm.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_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 11 matching lines @@
 namespace dart {
 
 DECLARE_FLAG(int, optimization_counter_threshold);
 DECLARE_FLAG(bool, propagate_ic_data);
 DECLARE_FLAG(bool, use_osr);
 
 // Generic summary for call instructions that have all arguments pushed
 // on the stack and return the result in a fixed register R0.
 LocationSummary* Instruction::MakeCallSummary() {
   LocationSummary* result = new LocationSummary(0, 0, LocationSummary::kCall);
-  result->set_out(Location::RegisterLocation(R0));
+  result->set_out(0, Location::RegisterLocation(R0));
   return result;
 }
 
 
 LocationSummary* PushArgumentInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps= 0;
   LocationSummary* locs =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   locs->set_in(0, Location::AnyOrConstant(value()));
@@ skipping 79 matching lines @@
 }
 
 
 LocationSummary* IfThenElseInstr::MakeLocationSummary(bool opt) const {
   comparison()->InitializeLocationSummary(opt);
   return comparison()->locs();
 }
 
 
 void IfThenElseInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  const Register result = locs()->out().reg();
+  const Register result = locs()->out(0).reg();
 
   Location left = locs()->in(0);
   Location right = locs()->in(1);
   ASSERT(!left.IsConstant() || !right.IsConstant());
 
   // Clear out register.
   __ eor(result, result, ShifterOperand(result));
 
   // Emit comparison code. This must not overwrite the result register.
   BranchLabels labels = { NULL, NULL, NULL };
@@ skipping 36 matching lines @@
     }
   }
 }
 
 
 LocationSummary* ClosureCallInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 1;
   LocationSummary* result =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
-  result->set_out(Location::RegisterLocation(R0));
+  result->set_out(0, Location::RegisterLocation(R0));
   result->set_temp(0, Location::RegisterLocation(R4));  // Arg. descriptor.
   return result;
 }
 
 
 void ClosureCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // The arguments to the stub include the closure, as does the arguments
   // descriptor.
   Register temp_reg = locs()->temp(0).reg();
   int argument_count = ArgumentCount();
@@ skipping 12 matching lines @@
 
 
 LocationSummary* LoadLocalInstr::MakeLocationSummary(bool opt) const {
   return LocationSummary::Make(0,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void LoadLocalInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   __ LoadFromOffset(kWord, result, FP, local().index() * kWordSize);
 }
 
 
 LocationSummary* StoreLocalInstr::MakeLocationSummary(bool opt) const {
   return LocationSummary::Make(1,
                                Location::SameAsFirstInput(),
                                LocationSummary::kNoCall);
 }
 
 
 void StoreLocalInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   ASSERT(result == value);  // Assert that register assignment is correct.
   __ str(value, Address(FP, local().index() * kWordSize));
 }
 
 
 LocationSummary* ConstantInstr::MakeLocationSummary(bool opt) const {
   return LocationSummary::Make(0,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void ConstantInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // The register allocator drops constant definitions that have no uses.
-  if (!locs()->out().IsInvalid()) {
-    Register result = locs()->out().reg();
+  if (!locs()->out(0).IsInvalid()) {
+    Register result = locs()->out(0).reg();
     __ LoadObject(result, value());
   }
 }
 
 
 LocationSummary* AssertAssignableInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 3;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
   summary->set_in(0, Location::RegisterLocation(R0));  // Value.
   summary->set_in(1, Location::RegisterLocation(R2));  // Instantiator.
   summary->set_in(2, Location::RegisterLocation(R1));  // Type arguments.
-  summary->set_out(Location::RegisterLocation(R0));
+  summary->set_out(0, Location::RegisterLocation(R0));
   return summary;
 }
 
 
 LocationSummary* AssertBooleanInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* locs =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_in(0, Location::RegisterLocation(R0));
-  locs->set_out(Location::RegisterLocation(R0));
+  locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 static void EmitAssertBoolean(Register reg,
                               intptr_t token_pos,
                               intptr_t deopt_id,
                               LocationSummary* locs,
                               FlowGraphCompiler* compiler) {
   // Check that the type of the value is allowed in conditional context.
@@ skipping 12 matching lines @@
                                 1,
                                 locs);
   // We should never return here.
   __ bkpt(0);
   __ Bind(&done);
 }
 
 
 void AssertBooleanInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register obj = locs()->in(0).reg();
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
 
   EmitAssertBoolean(obj, token_pos(), deopt_id(), locs(), compiler);
   ASSERT(obj == result);
 }
 
 
 static Condition TokenKindToSmiCondition(Token::Kind kind) {
   switch (kind) {
     case Token::kEQ: return EQ;
     case Token::kNE: return NE;
@@ skipping 10 matching lines @@
 
 LocationSummary* EqualityCompareInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   if (operation_cid() == kMintCid) {
     const intptr_t kNumTemps = 1;
     LocationSummary* locs =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
     locs->set_in(0, Location::RequiresFpuRegister());
     locs->set_in(1, Location::RequiresFpuRegister());
     locs->set_temp(0, Location::RequiresRegister());
-    locs->set_out(Location::RequiresRegister());
+    locs->set_out(0, Location::RequiresRegister());
     return locs;
   }
   if (operation_cid() == kDoubleCid) {
     const intptr_t kNumTemps = 0;
     LocationSummary* locs =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
     locs->set_in(0, Location::RequiresFpuRegister());
     locs->set_in(1, Location::RequiresFpuRegister());
-    locs->set_out(Location::RequiresRegister());
+    locs->set_out(0, Location::RequiresRegister());
     return locs;
   }
   if (operation_cid() == kSmiCid) {
     const intptr_t kNumTemps = 0;
     LocationSummary* locs =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
     locs->set_in(0, Location::RegisterOrConstant(left()));
     // Only one input can be a constant operand. The case of two constant
     // operands should be handled by constant propagation.
     locs->set_in(1, locs->in(0).IsConstant()
                         ? Location::RequiresRegister()
                         : Location::RegisterOrConstant(right()));
-    locs->set_out(Location::RequiresRegister());
+    locs->set_out(0, Location::RequiresRegister());
     return locs;
   }
   UNREACHABLE();
   return NULL;
 }
 
 
 static void LoadValueCid(FlowGraphCompiler* compiler,
                          Register value_cid_reg,
                          Register value_reg,
@@ skipping 112 matching lines @@
 }
 
 
 void EqualityCompareInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT((kind() == Token::kNE) || (kind() == Token::kEQ));
 
   // The ARM code does not use true- and false-labels here.
   BranchLabels labels = { NULL, NULL, NULL };
   Condition true_condition = EmitComparisonCode(compiler, labels);
 
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   if (operation_cid() == kSmiCid) {
     __ LoadObject(result, Bool::True(), true_condition);
     __ LoadObject(result, Bool::False(), NegateCondition(true_condition));
   } else {
     ASSERT(operation_cid() == kDoubleCid);
     Label done;
     __ LoadObject(result, Bool::False());
     if (true_condition != NE) {
       __ b(&done, VS);  // x == NaN -> false, x != NaN -> true.
     }
@@ skipping 66 matching lines @@
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   if (operation_cid() == kMintCid) {
     const intptr_t kNumTemps = 2;
     LocationSummary* locs =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
     locs->set_in(0, Location::RequiresFpuRegister());
     locs->set_in(1, Location::RequiresFpuRegister());
     locs->set_temp(0, Location::RequiresRegister());
     locs->set_temp(1, Location::RequiresRegister());
-    locs->set_out(Location::RequiresRegister());
+    locs->set_out(0, Location::RequiresRegister());
     return locs;
   }
   if (operation_cid() == kDoubleCid) {
     LocationSummary* summary =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresFpuRegister());
     summary->set_in(1, Location::RequiresFpuRegister());
-    summary->set_out(Location::RequiresRegister());
+    summary->set_out(0, Location::RequiresRegister());
     return summary;
   }
   ASSERT(operation_cid() == kSmiCid);
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RegisterOrConstant(left()));
   // Only one input can be a constant operand. The case of two constant
   // operands should be handled by constant propagation.
   summary->set_in(1, summary->in(0).IsConstant()
                          ? Location::RequiresRegister()
                          : Location::RegisterOrConstant(right()));
-  summary->set_out(Location::RequiresRegister());
+  summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 Condition RelationalOpInstr::EmitComparisonCode(FlowGraphCompiler* compiler,
                                                 BranchLabels labels) {
   if (operation_cid() == kSmiCid) {
     return EmitSmiComparisonOp(compiler, locs(), kind());
   } else {
     ASSERT(operation_cid() == kDoubleCid);
     return EmitDoubleComparisonOp(compiler, locs(), kind());
   }
 }
 
 
 void RelationalOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // The ARM code does not use true- and false-labels here.
   BranchLabels labels = { NULL, NULL, NULL };
   Condition true_condition = EmitComparisonCode(compiler, labels);
 
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   if (operation_cid() == kSmiCid) {
     __ LoadObject(result, Bool::True(), true_condition);
     __ LoadObject(result, Bool::False(), NegateCondition(true_condition));
   } else {
     ASSERT(operation_cid() == kDoubleCid);
     Label done;
     __ LoadObject(result, Bool::False());
     if (true_condition != NE) {
       __ b(&done, VS);  // x == NaN -> false, x != NaN -> true.
     }
@@ skipping 18 matching lines @@
 
 
 LocationSummary* NativeCallInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 3;
   LocationSummary* locs =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_temp(0, Location::RegisterLocation(R1));
   locs->set_temp(1, Location::RegisterLocation(R2));
   locs->set_temp(2, Location::RegisterLocation(R5));
-  locs->set_out(Location::RegisterLocation(R0));
+  locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 void NativeCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(locs()->temp(0).reg() == R1);
   ASSERT(locs()->temp(1).reg() == R2);
   ASSERT(locs()->temp(2).reg() == R5);
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
 
   // Push the result place holder initialized to NULL.
   __ PushObject(Object::ZoneHandle());
   // Pass a pointer to the first argument in R2.
   if (!function().HasOptionalParameters()) {
     __ AddImmediate(R2, FP, (kParamEndSlotFromFp +
                              function().NumParameters()) * kWordSize);
   } else {
     __ AddImmediate(R2, FP, kFirstLocalSlotFromFp * kWordSize);
   }
@@ skipping 34 matching lines @@
   const intptr_t kNumInputs = 1;
   // TODO(fschneider): Allow immediate operands for the char code.
   return LocationSummary::Make(kNumInputs,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void StringFromCharCodeInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register char_code = locs()->in(0).reg();
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   __ LoadImmediate(result,
                    reinterpret_cast<uword>(Symbols::PredefinedAddress()));
   __ AddImmediate(result, Symbols::kNullCharCodeSymbolOffset * kWordSize);
   __ ldr(result, Address(result, char_code, LSL, 1));  // Char code is a smi.
 }
 
 
 LocationSummary* StringToCharCodeInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   return LocationSummary::Make(kNumInputs,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void StringToCharCodeInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(cid_ == kOneByteStringCid);
   Register str = locs()->in(0).reg();
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   __ ldr(result, FieldAddress(str, String::length_offset()));
   __ cmp(result, ShifterOperand(Smi::RawValue(1)));
   __ LoadImmediate(result, Smi::RawValue(-1), NE);
   __ ldrb(result, FieldAddress(str, OneByteString::data_offset()), EQ);
   __ SmiTag(result);
 }
 
 
 LocationSummary* StringInterpolateInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
   summary->set_in(0, Location::RegisterLocation(R0));
-  summary->set_out(Location::RegisterLocation(R0));
+  summary->set_out(0, Location::RegisterLocation(R0));
   return summary;
 }
 
 
 void StringInterpolateInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register array = locs()->in(0).reg();
   __ Push(array);
   const int kNumberOfArguments = 1;
   const Array& kNoArgumentNames = Object::null_array();
   compiler->GenerateStaticCall(deopt_id(),
                                token_pos(),
                                CallFunction(),
                                kNumberOfArguments,
                                kNoArgumentNames,
                                locs());
-  ASSERT(locs()->out().reg() == R0);
+  ASSERT(locs()->out(0).reg() == R0);
 }
 
 
 LocationSummary* LoadUntaggedInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   return LocationSummary::Make(kNumInputs,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void LoadUntaggedInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register object = locs()->in(0).reg();
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   __ LoadFromOffset(kWord, result, object, offset() - kHeapObjectTag);
 }
 
 
 LocationSummary* LoadClassIdInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   return LocationSummary::Make(kNumInputs,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void LoadClassIdInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register object = locs()->in(0).reg();
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   Label load, done;
   __ tst(object, ShifterOperand(kSmiTagMask));
   __ b(&load, NE);
   __ LoadImmediate(result, Smi::RawValue(kSmiCid));
   __ b(&done);
   __ Bind(&load);
   __ LoadClassId(result, object);
   __ SmiTag(result);
   __ Bind(&done);
 }
@@ skipping 87 matching lines @@
   // TODO(regis): Revisit and see if the index can be immediate.
   locs->set_in(1, Location::WritableRegister());
   if ((representation() == kUnboxedDouble)    ||
       (representation() == kUnboxedFloat32x4) ||
       (representation() == kUnboxedInt32x4)   ||
       (representation() == kUnboxedFloat64x2)) {
     if (class_id() == kTypedDataFloat32ArrayCid) {
       // Need register <= Q7 for float operations.
       // TODO(fschneider): Add a register policy to specify a subset of
       // registers.
-      locs->set_out(Location::FpuRegisterLocation(Q7));
+      locs->set_out(0, Location::FpuRegisterLocation(Q7));
     } else {
-      locs->set_out(Location::RequiresFpuRegister());
+      locs->set_out(0, Location::RequiresFpuRegister());
     }
   } else {
-    locs->set_out(Location::RequiresRegister());
+    locs->set_out(0, Location::RequiresRegister());
   }
   return locs;
 }
 
 
 void LoadIndexedInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register array = locs()->in(0).reg();
   Location index = locs()->in(1);
 
   Address element_address(kNoRegister, 0);
@@ skipping 31 matching lines @@
     __ AddImmediate(index.reg(),
         FlowGraphCompiler::DataOffsetFor(class_id()) - kHeapObjectTag);
   }
   element_address = Address(array, index.reg(), LSL, 0);
 
   if ((representation() == kUnboxedDouble)    ||
       (representation() == kUnboxedMint)      ||
       (representation() == kUnboxedFloat32x4) ||
       (representation() == kUnboxedInt32x4)   ||
       (representation() == kUnboxedFloat64x2)) {
-    QRegister result = locs()->out().fpu_reg();
+    QRegister result = locs()->out(0).fpu_reg();
     DRegister dresult0 = EvenDRegisterOf(result);
     DRegister dresult1 = OddDRegisterOf(result);
     switch (class_id()) {
       case kTypedDataInt32ArrayCid:
         UNIMPLEMENTED();
         break;
       case kTypedDataUint32ArrayCid:
         UNIMPLEMENTED();
         break;
       case kTypedDataFloat32ArrayCid:
@@ skipping 14 matching lines @@
       case kTypedDataFloat32x4ArrayCid:
         __ add(index.reg(), index.reg(), ShifterOperand(array));
         // TODO(zra): Maybe use vldmd here.
         __ LoadDFromOffset(dresult0, index.reg(), 0);
         __ LoadDFromOffset(dresult1, index.reg(), 2 * kWordSize);
         break;
     }
     return;
   }
 
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   switch (class_id()) {
     case kTypedDataInt8ArrayCid:
       ASSERT(index_scale() == 1);
       __ ldrsb(result, element_address);
       __ SmiTag(result);
       break;
     case kTypedDataUint8ArrayCid:
     case kTypedDataUint8ClampedArrayCid:
     case kExternalTypedDataUint8ArrayCid:
     case kExternalTypedDataUint8ClampedArrayCid:
@@ skipping 591 matching lines @@
 
   virtual void EmitNativeCode(FlowGraphCompiler* compiler) {
     __ Comment("StoreInstanceFieldSlowPath");
     __ Bind(entry_label());
 
     const Code& stub =
         Code::Handle(StubCode::GetAllocationStubForClass(cls_));
     const ExternalLabel label(cls_.ToCString(), stub.EntryPoint());
 
     LocationSummary* locs = instruction_->locs();
-    locs->live_registers()->Remove(locs->out());
+    locs->live_registers()->Remove(locs->out(0));
 
     compiler->SaveLiveRegisters(locs);
     compiler->GenerateCall(Scanner::kNoSourcePos,  // No token position.
                            &label,
                            PcDescriptors::kOther,
                            locs);
     __ MoveRegister(locs->temp(0).reg(), R0);
     compiler->RestoreLiveRegisters(locs);
 
     __ b(exit_label());
@@ skipping 272 matching lines @@
   __ Bind(&skip_store);
 }
 
 
 LocationSummary* LoadStaticFieldInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
-  summary->set_out(Location::RequiresRegister());
+  summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 // When the parser is building an implicit static getter for optimization,
 // it can generate a function body where deoptimization ids do not line up
 // with the unoptimized code.
 //
 // This is safe only so long as LoadStaticFieldInstr cannot deoptimize.
 void LoadStaticFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register field = locs()->in(0).reg();
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   __ LoadFromOffset(kWord, result,
                     field, Field::value_offset() - kHeapObjectTag);
 }
 
 
 LocationSummary* StoreStaticFieldInstr::MakeLocationSummary(bool opt) const {
   LocationSummary* locs = new LocationSummary(1, 1, LocationSummary::kNoCall);
   locs->set_in(0, value()->NeedsStoreBuffer() ? Location::WritableRegister()
                                               : Location::RequiresRegister());
   locs->set_temp(0, Location::RequiresRegister());
@@ skipping 17 matching lines @@
 
 
 LocationSummary* InstanceOfInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 3;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
   summary->set_in(0, Location::RegisterLocation(R0));
   summary->set_in(1, Location::RegisterLocation(R2));
   summary->set_in(2, Location::RegisterLocation(R1));
-  summary->set_out(Location::RegisterLocation(R0));
+  summary->set_out(0, Location::RegisterLocation(R0));
   return summary;
 }
 
 
 void InstanceOfInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(locs()->in(0).reg() == R0);  // Value.
   ASSERT(locs()->in(1).reg() == R2);  // Instantiator.
   ASSERT(locs()->in(2).reg() == R1);  // Instantiator type arguments.
 
   compiler->GenerateInstanceOf(token_pos(),
                                deopt_id(),
                                type(),
                                negate_result(),
                                locs());
-  ASSERT(locs()->out().reg() == R0);
+  ASSERT(locs()->out(0).reg() == R0);
 }
 
 
 LocationSummary* CreateArrayInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* locs =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_in(kElementTypePos, Location::RegisterLocation(R1));
   locs->set_in(kLengthPos, Location::RegisterLocation(R2));
-  locs->set_out(Location::RegisterLocation(R0));
+  locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 void CreateArrayInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // Allocate the array.  R2 = length, R1 = element type.
   ASSERT(locs()->in(kElementTypePos).reg() == R1);
   ASSERT(locs()->in(kLengthPos).reg() == R2);
   compiler->GenerateCall(token_pos(),
                          &StubCode::AllocateArrayLabel(),
                          PcDescriptors::kOther,
                          locs());
-  ASSERT(locs()->out().reg() == R0);
+  ASSERT(locs()->out(0).reg() == R0);
 }
 
 
 class BoxDoubleSlowPath : public SlowPathCode {
  public:
   explicit BoxDoubleSlowPath(Instruction* instruction)
       : instruction_(instruction) { }
 
   virtual void EmitNativeCode(FlowGraphCompiler* compiler) {
     __ Comment("BoxDoubleSlowPath");
     __ Bind(entry_label());
     const Class& double_class = compiler->double_class();
     const Code& stub =
         Code::Handle(StubCode::GetAllocationStubForClass(double_class));
     const ExternalLabel label(double_class.ToCString(), stub.EntryPoint());
 
     LocationSummary* locs = instruction_->locs();
-    locs->live_registers()->Remove(locs->out());
+    locs->live_registers()->Remove(locs->out(0));
 
     compiler->SaveLiveRegisters(locs);
     compiler->GenerateCall(Scanner::kNoSourcePos,  // No token position.
                            &label,
                            PcDescriptors::kOther,
                            locs);
-    __ MoveRegister(locs->out().reg(), R0);
+    __ MoveRegister(locs->out(0).reg(), R0);
     compiler->RestoreLiveRegisters(locs);
 
     __ b(exit_label());
   }
 
  private:
   Instruction* instruction_;
 };
 
 
 class BoxFloat32x4SlowPath : public SlowPathCode {
  public:
   explicit BoxFloat32x4SlowPath(Instruction* instruction)
       : instruction_(instruction) { }
 
   virtual void EmitNativeCode(FlowGraphCompiler* compiler) {
     __ Comment("BoxFloat32x4SlowPath");
     __ Bind(entry_label());
     const Class& float32x4_class = compiler->float32x4_class();
     const Code& stub =
         Code::Handle(StubCode::GetAllocationStubForClass(float32x4_class));
     const ExternalLabel label(float32x4_class.ToCString(), stub.EntryPoint());
 
     LocationSummary* locs = instruction_->locs();
-    locs->live_registers()->Remove(locs->out());
+    locs->live_registers()->Remove(locs->out(0));
 
     compiler->SaveLiveRegisters(locs);
     compiler->GenerateCall(Scanner::kNoSourcePos,  // No token position.
                            &label,
                            PcDescriptors::kOther,
                            locs);
-    __ mov(locs->out().reg(), ShifterOperand(R0));
+    __ mov(locs->out(0).reg(), ShifterOperand(R0));
     compiler->RestoreLiveRegisters(locs);
 
     __ b(exit_label());
   }
 
  private:
   Instruction* instruction_;
 };
 
 
 class BoxFloat64x2SlowPath : public SlowPathCode {
  public:
   explicit BoxFloat64x2SlowPath(Instruction* instruction)
       : instruction_(instruction) { }
 
   virtual void EmitNativeCode(FlowGraphCompiler* compiler) {
     __ Comment("BoxFloat64x2SlowPath");
     __ Bind(entry_label());
     const Class& float64x2_class = compiler->float64x2_class();
     const Code& stub =
         Code::Handle(StubCode::GetAllocationStubForClass(float64x2_class));
     const ExternalLabel label(float64x2_class.ToCString(), stub.EntryPoint());
 
     LocationSummary* locs = instruction_->locs();
-    locs->live_registers()->Remove(locs->out());
+    locs->live_registers()->Remove(locs->out(0));
 
     compiler->SaveLiveRegisters(locs);
     compiler->GenerateCall(Scanner::kNoSourcePos,  // No token position.
                            &label,
                            PcDescriptors::kOther,
                            locs);
-    __ mov(locs->out().reg(), ShifterOperand(R0));
+    __ mov(locs->out(0).reg(), ShifterOperand(R0));
     compiler->RestoreLiveRegisters(locs);
 
     __ b(exit_label());
   }
 
  private:
   Instruction* instruction_;
 };
 
 
 LocationSummary* LoadFieldInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* locs =
       new LocationSummary(
           kNumInputs, kNumTemps,
           (opt && !IsPotentialUnboxedLoad())
           ? LocationSummary::kNoCall
           : LocationSummary::kCallOnSlowPath);
 
   locs->set_in(0, Location::RequiresRegister());
 
   if (IsUnboxedLoad() && opt) {
     locs->AddTemp(Location::RequiresRegister());
   } else if (IsPotentialUnboxedLoad()) {
     locs->AddTemp(opt ? Location::RequiresFpuRegister()
                       : Location::FpuRegisterLocation(Q1));
     locs->AddTemp(Location::RequiresRegister());
   }
-  locs->set_out(Location::RequiresRegister());
+  locs->set_out(0, Location::RequiresRegister());
   return locs;
 }
 
 
 void LoadFieldInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register instance_reg = locs()->in(0).reg();
   if (IsUnboxedLoad() && compiler->is_optimizing()) {
-    DRegister result = EvenDRegisterOf(locs()->out().fpu_reg());
-    DRegister result_odd = OddDRegisterOf(locs()->out().fpu_reg());
+    DRegister result = EvenDRegisterOf(locs()->out(0).fpu_reg());
+    DRegister result_odd = OddDRegisterOf(locs()->out(0).fpu_reg());
     Register temp = locs()->temp(0).reg();
     __ ldr(temp, FieldAddress(instance_reg, offset_in_bytes()));
     intptr_t cid = field()->UnboxedFieldCid();
     switch (cid) {
       case kDoubleCid:
         __ Comment("UnboxedDoubleLoadFieldInstr");
         __ LoadDFromOffset(result, temp,
                            Double::value_offset() - kHeapObjectTag);
         break;
       case kFloat32x4Cid:
@@ skipping 12 matching lines @@
         __ LoadDFromOffset(result_odd, temp,
             Float64x2::value_offset() + 2 * kWordSize - kHeapObjectTag);
         break;
       default:
         UNREACHABLE();
     }
     return;
   }
 
   Label done;
-  Register result_reg = locs()->out().reg();
+  Register result_reg = locs()->out(0).reg();
   if (IsPotentialUnboxedLoad()) {
     Register temp = locs()->temp(1).reg();
     DRegister value = EvenDRegisterOf(locs()->temp(0).fpu_reg());
     DRegister value_odd = OddDRegisterOf(locs()->temp(0).fpu_reg());
 
     Label load_pointer;
     Label load_double;
     Label load_float32x4;
     Label load_float64x2;
 
@@ skipping 97 matching lines @@
   __ Bind(&done);
 }
 
 
 LocationSummary* InstantiateTypeInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* locs =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_in(0, Location::RegisterLocation(R0));
-  locs->set_out(Location::RegisterLocation(R0));
+  locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 void InstantiateTypeInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register instantiator_reg = locs()->in(0).reg();
-  Register result_reg = locs()->out().reg();
+  Register result_reg = locs()->out(0).reg();
 
   // 'instantiator_reg' is the instantiator TypeArguments object (or null).
   // A runtime call to instantiate the type is required.
   __ PushObject(Object::ZoneHandle());  // Make room for the result.
   __ PushObject(type());
   __ Push(instantiator_reg);  // Push instantiator type arguments.
   compiler->GenerateRuntimeCall(token_pos(),
                                 deopt_id(),
                                 kInstantiateTypeRuntimeEntry,
                                 2,
                                 locs());
   __ Drop(2);  // Drop instantiator and uninstantiated type.
   __ Pop(result_reg);  // Pop instantiated type.
   ASSERT(instantiator_reg == result_reg);
 }
 
 
 LocationSummary* InstantiateTypeArgumentsInstr::MakeLocationSummary(
     bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* locs =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_in(0, Location::RegisterLocation(R0));
-  locs->set_out(Location::RegisterLocation(R0));
+  locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 void InstantiateTypeArgumentsInstr::EmitNativeCode(
     FlowGraphCompiler* compiler) {
   Register instantiator_reg = locs()->in(0).reg();
-  Register result_reg = locs()->out().reg();
+  Register result_reg = locs()->out(0).reg();
   ASSERT(instantiator_reg == R0);
   ASSERT(instantiator_reg == result_reg);
 
   // 'instantiator_reg' is the instantiator TypeArguments object (or null).
   ASSERT(!type_arguments().IsUninstantiatedIdentity() &&
          !type_arguments().CanShareInstantiatorTypeArguments(
              instantiator_class()));
   // If the instantiator is null and if the type argument vector
   // instantiated from null becomes a vector of dynamic, then use null as
   // the type arguments.
@@ skipping 39 matching lines @@
   __ Bind(&type_arguments_instantiated);
 }
 
 
 LocationSummary* AllocateContextInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 1;
   LocationSummary* locs =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_temp(0, Location::RegisterLocation(R1));
-  locs->set_out(Location::RegisterLocation(R0));
+  locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 void AllocateContextInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(locs()->temp(0).reg() == R1);
-  ASSERT(locs()->out().reg() == R0);
+  ASSERT(locs()->out(0).reg() == R0);
 
   __ LoadImmediate(R1, num_context_variables());
   const ExternalLabel label("alloc_context",
                             StubCode::AllocateContextEntryPoint());
   compiler->GenerateCall(token_pos(),
                          &label,
                          PcDescriptors::kOther,
                          locs());
 }
 
 
 LocationSummary* CloneContextInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* locs =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
   locs->set_in(0, Location::RegisterLocation(R0));
-  locs->set_out(Location::RegisterLocation(R0));
+  locs->set_out(0, Location::RegisterLocation(R0));
   return locs;
 }
 
 
 void CloneContextInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register context_value = locs()->in(0).reg();
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
 
   __ PushObject(Object::ZoneHandle());  // Make room for the result.
   __ Push(context_value);
   compiler->GenerateRuntimeCall(token_pos(),
                                 deopt_id(),
                                 kCloneContextRuntimeEntry,
                                 1,
                                 locs());
   __ Drop(1);  // Remove argument.
   __ Pop(result);  // Get result (cloned context).
@@ skipping 107 matching lines @@
   }
   __ Bind(slow_path->exit_label());
 }
 
 
 static void EmitSmiShiftLeft(FlowGraphCompiler* compiler,
                              BinarySmiOpInstr* shift_left) {
   const bool is_truncating = shift_left->is_truncating();
   const LocationSummary& locs = *shift_left->locs();
   Register left = locs.in(0).reg();
-  Register result = locs.out().reg();
+  Register result = locs.out(0).reg();
   Label* deopt = shift_left->CanDeoptimize() ?
       compiler->AddDeoptStub(shift_left->deopt_id(), kDeoptBinarySmiOp) : NULL;
   if (locs.in(1).IsConstant()) {
     const Object& constant = locs.in(1).constant();
     ASSERT(constant.IsSmi());
     // Immediate shift operation takes 5 bits for the count.
     const intptr_t kCountLimit = 0x1F;
     const intptr_t value = Smi::Cast(constant).Value();
     if (value == 0) {
       __ MoveRegister(result, left);
@@ skipping 101 matching lines @@
     summary->set_in(0, Location::RequiresRegister());
     if (RightIsPowerOfTwoConstant()) {
       ConstantInstr* right_constant = right()->definition()->AsConstant();
       summary->set_in(1, Location::Constant(right_constant->value()));
       summary->AddTemp(Location::RequiresRegister());
     } else {
       summary->set_in(1, Location::RequiresRegister());
       summary->AddTemp(Location::RequiresRegister());
       summary->AddTemp(Location::RequiresFpuRegister());
     }
-    summary->set_out(Location::RequiresRegister());
+    summary->set_out(0, Location::RequiresRegister());
     return summary;
   }
   if (op_kind() == Token::kMOD) {
     summary->set_in(0, Location::RequiresRegister());
     summary->set_in(1, Location::RequiresRegister());
     summary->AddTemp(Location::RequiresRegister());
     summary->AddTemp(Location::RequiresFpuRegister());
-    summary->set_out(Location::RequiresRegister());
+    summary->set_out(0, Location::RequiresRegister());
     return summary;
   }
   summary->set_in(0, Location::RequiresRegister());
   summary->set_in(1, Location::RegisterOrSmiConstant(right()));
   if (((op_kind() == Token::kSHL) && !is_truncating()) ||
       (op_kind() == Token::kSHR)) {
     summary->AddTemp(Location::RequiresRegister());
   }
   // We make use of 3-operand instructions by not requiring result register
   // to be identical to first input register as on Intel.
-  summary->set_out(Location::RequiresRegister());
+  summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void BinarySmiOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   if (op_kind() == Token::kSHL) {
     EmitSmiShiftLeft(compiler, this);
     return;
   }
 
   ASSERT(!is_truncating());
   Register left = locs()->in(0).reg();
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   Label* deopt = NULL;
   if (CanDeoptimize()) {
     deopt = compiler->AddDeoptStub(deopt_id(), kDeoptBinarySmiOp);
   }
 
   if (locs()->in(1).IsConstant()) {
     const Object& constant = locs()->in(1).constant();
     ASSERT(constant.IsSmi());
     int32_t imm = reinterpret_cast<int32_t>(constant.raw());
     switch (op_kind()) {
@@ skipping 303 matching lines @@
 
 LocationSummary* BoxDoubleInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 1;
   LocationSummary* summary =
       new LocationSummary(kNumInputs,
                           kNumTemps,
                           LocationSummary::kCallOnSlowPath);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_temp(0, Location::RequiresRegister());
-  summary->set_out(Location::RequiresRegister());
+  summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void BoxDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   BoxDoubleSlowPath* slow_path = new BoxDoubleSlowPath(this);
   compiler->AddSlowPathCode(slow_path);
 
-  const Register out_reg = locs()->out().reg();
+  const Register out_reg = locs()->out(0).reg();
   const DRegister value = EvenDRegisterOf(locs()->in(0).fpu_reg());
 
   __ TryAllocate(compiler->double_class(),
                  slow_path->entry_label(),
                  out_reg,
                  locs()->temp(0).reg());
   __ Bind(slow_path->exit_label());
   __ StoreDToOffset(value, out_reg, Double::value_offset() - kHeapObjectTag);
 }
 
 
 LocationSummary* UnboxDoubleInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t value_cid = value()->Type()->ToCid();
   const bool needs_temp = ((value_cid != kSmiCid) && (value_cid != kDoubleCid));
   const bool needs_writable_input = (value_cid == kSmiCid);
   const intptr_t kNumTemps = needs_temp ? 1 : 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, needs_writable_input
                      ? Location::WritableRegister()
                      : Location::RequiresRegister());
   if (needs_temp) summary->set_temp(0, Location::RequiresRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void UnboxDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const intptr_t value_cid = value()->Type()->ToCid();
   const Register value = locs()->in(0).reg();
-  const DRegister result = EvenDRegisterOf(locs()->out().fpu_reg());
+  const DRegister result = EvenDRegisterOf(locs()->out(0).fpu_reg());
 
   if (value_cid == kDoubleCid) {
     __ LoadDFromOffset(result, value, Double::value_offset() - kHeapObjectTag);
   } else if (value_cid == kSmiCid) {
     __ SmiUntag(value);  // Untag input before conversion.
     __ vmovsr(STMP, value);
     __ vcvtdi(result, STMP);
   } else {
     Label* deopt = compiler->AddDeoptStub(deopt_id_, kDeoptBinaryDoubleOp);
     Register temp = locs()->temp(0).reg();
@@ skipping 16 matching lines @@
 
 LocationSummary* BoxFloat32x4Instr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 1;
   LocationSummary* summary =
       new LocationSummary(kNumInputs,
                           kNumTemps,
                           LocationSummary::kCallOnSlowPath);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_temp(0, Location::RequiresRegister());
-  summary->set_out(Location::RequiresRegister());
+  summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void BoxFloat32x4Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   BoxFloat32x4SlowPath* slow_path = new BoxFloat32x4SlowPath(this);
   compiler->AddSlowPathCode(slow_path);
 
-  Register out_reg = locs()->out().reg();
+  Register out_reg = locs()->out(0).reg();
   QRegister value = locs()->in(0).fpu_reg();
   DRegister value_even = EvenDRegisterOf(value);
   DRegister value_odd = OddDRegisterOf(value);
 
   __ TryAllocate(compiler->float32x4_class(),
                  slow_path->entry_label(),
                  out_reg,
                  locs()->temp(0).reg());
   __ Bind(slow_path->exit_label());
 
   __ StoreDToOffset(value_even, out_reg,
       Float32x4::value_offset() - kHeapObjectTag);
   __ StoreDToOffset(value_odd, out_reg,
       Float32x4::value_offset() + 2 * kWordSize - kHeapObjectTag);
 }
 
 
 LocationSummary* UnboxFloat32x4Instr::MakeLocationSummary(bool opt) const {
   const intptr_t value_cid = value()->Type()->ToCid();
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = value_cid == kFloat32x4Cid ? 0 : 1;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   if (kNumTemps > 0) {
     ASSERT(kNumTemps == 1);
     summary->set_temp(0, Location::RequiresRegister());
   }
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void UnboxFloat32x4Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const intptr_t value_cid = value()->Type()->ToCid();
   const Register value = locs()->in(0).reg();
-  const QRegister result = locs()->out().fpu_reg();
+  const QRegister result = locs()->out(0).fpu_reg();
 
   if (value_cid != kFloat32x4Cid) {
     const Register temp = locs()->temp(0).reg();
     Label* deopt = compiler->AddDeoptStub(deopt_id_, kDeoptCheckClass);
     __ tst(value, ShifterOperand(kSmiTagMask));
     __ b(deopt, EQ);
     __ CompareClassId(value, kFloat32x4Cid, temp);
     __ b(deopt, NE);
   }
 
   const DRegister result_even = EvenDRegisterOf(result);
   const DRegister result_odd = OddDRegisterOf(result);
   // TODO(zra): Maybe use vldmd here.
   __ LoadDFromOffset(result_even, value,
       Float32x4::value_offset() - kHeapObjectTag);
   __ LoadDFromOffset(result_odd, value,
       Float32x4::value_offset() + 2 * kWordSize - kHeapObjectTag);
 }
 
 
 LocationSummary* BoxFloat64x2Instr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 1;
   LocationSummary* summary =
       new LocationSummary(kNumInputs,
                           kNumTemps,
                           LocationSummary::kCallOnSlowPath);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_temp(0, Location::RequiresRegister());
-  summary->set_out(Location::RequiresRegister());
+  summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void BoxFloat64x2Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   BoxFloat64x2SlowPath* slow_path = new BoxFloat64x2SlowPath(this);
   compiler->AddSlowPathCode(slow_path);
 
-  Register out_reg = locs()->out().reg();
+  Register out_reg = locs()->out(0).reg();
   QRegister value = locs()->in(0).fpu_reg();
   DRegister value_even = EvenDRegisterOf(value);
   DRegister value_odd = OddDRegisterOf(value);
 
   __ TryAllocate(compiler->float64x2_class(),
                  slow_path->entry_label(),
                  out_reg,
                  locs()->temp(0).reg());
   __ Bind(slow_path->exit_label());
 
   __ StoreDToOffset(value_even, out_reg,
       Float64x2::value_offset() - kHeapObjectTag);
   __ StoreDToOffset(value_odd, out_reg,
       Float64x2::value_offset() + 2 * kWordSize - kHeapObjectTag);
 }
 
 
 LocationSummary* UnboxFloat64x2Instr::MakeLocationSummary(bool opt) const {
   const intptr_t value_cid = value()->Type()->ToCid();
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = value_cid == kFloat64x2Cid ? 0 : 1;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   if (kNumTemps > 0) {
     ASSERT(kNumTemps == 1);
     summary->set_temp(0, Location::RequiresRegister());
   }
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void UnboxFloat64x2Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const intptr_t value_cid = value()->Type()->ToCid();
   const Register value = locs()->in(0).reg();
-  const QRegister result = locs()->out().fpu_reg();
+  const QRegister result = locs()->out(0).fpu_reg();
 
   if (value_cid != kFloat64x2Cid) {
     const Register temp = locs()->temp(0).reg();
     Label* deopt = compiler->AddDeoptStub(deopt_id_, kDeoptCheckClass);
     __ tst(value, ShifterOperand(kSmiTagMask));
     __ b(deopt, EQ);
     __ CompareClassId(value, kFloat64x2Cid, temp);
     __ b(deopt, NE);
   }
 
   const DRegister result_even = EvenDRegisterOf(result);
   const DRegister result_odd = OddDRegisterOf(result);
   // TODO(zra): Maybe use vldmd here.
   __ LoadDFromOffset(result_even, value,
       Float64x2::value_offset() - kHeapObjectTag);
   __ LoadDFromOffset(result_odd, value,
       Float64x2::value_offset() + 2 * kWordSize - kHeapObjectTag);
 }
 
 
 LocationSummary* BoxInt32x4Instr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 1;
   LocationSummary* summary =
       new LocationSummary(kNumInputs,
                           kNumTemps,
                           LocationSummary::kCallOnSlowPath);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_temp(0, Location::RequiresRegister());
-  summary->set_out(Location::RequiresRegister());
+  summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 class BoxInt32x4SlowPath : public SlowPathCode {
  public:
   explicit BoxInt32x4SlowPath(BoxInt32x4Instr* instruction)
       : instruction_(instruction) { }
 
   virtual void EmitNativeCode(FlowGraphCompiler* compiler) {
     __ Comment("BoxInt32x4SlowPath");
     __ Bind(entry_label());
     const Class& int32x4_class = compiler->int32x4_class();
     const Code& stub =
         Code::Handle(StubCode::GetAllocationStubForClass(int32x4_class));
     const ExternalLabel label(int32x4_class.ToCString(), stub.EntryPoint());
 
     LocationSummary* locs = instruction_->locs();
-    locs->live_registers()->Remove(locs->out());
+    locs->live_registers()->Remove(locs->out(0));
 
     compiler->SaveLiveRegisters(locs);
     compiler->GenerateCall(Scanner::kNoSourcePos,  // No token position.
                            &label,
                            PcDescriptors::kOther,
                            locs);
-    __ mov(locs->out().reg(), ShifterOperand(R0));
+    __ mov(locs->out(0).reg(), ShifterOperand(R0));
     compiler->RestoreLiveRegisters(locs);
 
     __ b(exit_label());
   }
 
  private:
   BoxInt32x4Instr* instruction_;
 };
 
 
 void BoxInt32x4Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   BoxInt32x4SlowPath* slow_path = new BoxInt32x4SlowPath(this);
   compiler->AddSlowPathCode(slow_path);
 
-  Register out_reg = locs()->out().reg();
+  Register out_reg = locs()->out(0).reg();
   QRegister value = locs()->in(0).fpu_reg();
   DRegister value_even = EvenDRegisterOf(value);
   DRegister value_odd = OddDRegisterOf(value);
 
   __ TryAllocate(compiler->int32x4_class(),
                  slow_path->entry_label(),
                  out_reg,
                  locs()->temp(0).reg());
   __ Bind(slow_path->exit_label());
   __ StoreDToOffset(value_even, out_reg,
       Int32x4::value_offset() - kHeapObjectTag);
   __ StoreDToOffset(value_odd, out_reg,
       Int32x4::value_offset() + 2 * kWordSize - kHeapObjectTag);
 }
 
 
 LocationSummary* UnboxInt32x4Instr::MakeLocationSummary(bool opt) const {
   const intptr_t value_cid = value()->Type()->ToCid();
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = value_cid == kInt32x4Cid ? 0 : 1;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   if (kNumTemps > 0) {
     ASSERT(kNumTemps == 1);
     summary->set_temp(0, Location::RequiresRegister());
   }
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void UnboxInt32x4Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const intptr_t value_cid = value()->Type()->ToCid();
   const Register value = locs()->in(0).reg();
-  const QRegister result = locs()->out().fpu_reg();
+  const QRegister result = locs()->out(0).fpu_reg();
 
   if (value_cid != kInt32x4Cid) {
     const Register temp = locs()->temp(0).reg();
     Label* deopt = compiler->AddDeoptStub(deopt_id_, kDeoptCheckClass);
     __ tst(value, ShifterOperand(kSmiTagMask));
     __ b(deopt, EQ);
     __ CompareClassId(value, kInt32x4Cid, temp);
     __ b(deopt, NE);
   }
 
   const DRegister result_even = EvenDRegisterOf(result);
   const DRegister result_odd = OddDRegisterOf(result);
   // TODO(zra): Maybe use vldmd here.
   __ LoadDFromOffset(result_even, value,
       Int32x4::value_offset() - kHeapObjectTag);
   __ LoadDFromOffset(result_odd, value,
       Int32x4::value_offset() + 2 * kWordSize - kHeapObjectTag);
 }
 
 
 LocationSummary* BinaryDoubleOpInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void BinaryDoubleOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   DRegister left = EvenDRegisterOf(locs()->in(0).fpu_reg());
   DRegister right = EvenDRegisterOf(locs()->in(1).fpu_reg());
-  DRegister result = EvenDRegisterOf(locs()->out().fpu_reg());
+  DRegister result = EvenDRegisterOf(locs()->out(0).fpu_reg());
   switch (op_kind()) {
     case Token::kADD: __ vaddd(result, left, right); break;
     case Token::kSUB: __ vsubd(result, left, right); break;
     case Token::kMUL: __ vmuld(result, left, right); break;
     case Token::kDIV: __ vdivd(result, left, right); break;
     default: UNREACHABLE();
   }
 }
 
 
 LocationSummary* BinaryFloat32x4OpInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void BinaryFloat32x4OpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister left = locs()->in(0).fpu_reg();
   QRegister right = locs()->in(1).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   switch (op_kind()) {
     case Token::kADD: __ vaddqs(result, left, right); break;
     case Token::kSUB: __ vsubqs(result, left, right); break;
     case Token::kMUL: __ vmulqs(result, left, right); break;
     case Token::kDIV: __ Vdivqs(result, left, right); break;
     default: UNREACHABLE();
   }
 }
 
 
 LocationSummary* BinaryFloat64x2OpInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void BinaryFloat64x2OpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister left = locs()->in(0).fpu_reg();
   QRegister right = locs()->in(1).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   DRegister left0 = EvenDRegisterOf(left);
   DRegister left1 = OddDRegisterOf(left);
 
   DRegister right0 = EvenDRegisterOf(right);
   DRegister right1 = OddDRegisterOf(right);
 
   DRegister result0 = EvenDRegisterOf(result);
   DRegister result1 = OddDRegisterOf(result);
 
@@ skipping 19 matching lines @@
 }
 
 
 LocationSummary* Simd32x4ShuffleInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   // Low (< Q7) Q registers are needed for the vcvtds and vmovs instructions.
   summary->set_in(0, Location::FpuRegisterLocation(Q5));
-  summary->set_out(Location::FpuRegisterLocation(Q6));
+  summary->set_out(0, Location::FpuRegisterLocation(Q6));
   return summary;
 }
 
 
 void Simd32x4ShuffleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister value = locs()->in(0).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
   DRegister dresult0 = EvenDRegisterOf(result);
   DRegister dresult1 = OddDRegisterOf(result);
   SRegister sresult0 = EvenSRegisterOf(dresult0);
   SRegister sresult1 = OddSRegisterOf(dresult0);
   SRegister sresult2 = EvenSRegisterOf(dresult1);
   SRegister sresult3 = OddSRegisterOf(dresult1);
 
   DRegister dvalue0 = EvenDRegisterOf(value);
   DRegister dvalue1 = OddDRegisterOf(value);
 
@@ skipping 53 matching lines @@
 
 
 LocationSummary* Simd32x4ShuffleMixInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   // Low (< Q7) Q registers are needed for the vcvtds and vmovs instructions.
   summary->set_in(0, Location::FpuRegisterLocation(Q4));
   summary->set_in(1, Location::FpuRegisterLocation(Q5));
-  summary->set_out(Location::FpuRegisterLocation(Q6));
+  summary->set_out(0, Location::FpuRegisterLocation(Q6));
   return summary;
 }
 
 
 void Simd32x4ShuffleMixInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister left = locs()->in(0).fpu_reg();
   QRegister right = locs()->in(1).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   DRegister dresult0 = EvenDRegisterOf(result);
   DRegister dresult1 = OddDRegisterOf(result);
   SRegister sresult0 = EvenSRegisterOf(dresult0);
   SRegister sresult1 = OddSRegisterOf(dresult0);
   SRegister sresult2 = EvenSRegisterOf(dresult1);
   SRegister sresult3 = OddSRegisterOf(dresult1);
 
   DRegister dleft0 = EvenDRegisterOf(left);
   DRegister dleft1 = OddDRegisterOf(left);
@@ skipping 26 matching lines @@
 }
 
 
 LocationSummary* Simd32x4GetSignMaskInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 1;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::FpuRegisterLocation(Q5));
   summary->set_temp(0, Location::RequiresRegister());
-  summary->set_out(Location::RequiresRegister());
+  summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void Simd32x4GetSignMaskInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister value = locs()->in(0).fpu_reg();
   DRegister dvalue0 = EvenDRegisterOf(value);
   DRegister dvalue1 = OddDRegisterOf(value);
 
-  Register out = locs()->out().reg();
+  Register out = locs()->out(0).reg();
   Register temp = locs()->temp(0).reg();
 
   // X lane.
   __ vmovrs(out, EvenSRegisterOf(dvalue0));
   __ Lsr(out, out, 31);
   // Y lane.
   __ vmovrs(temp, OddSRegisterOf(dvalue0));
   __ Lsr(temp, temp, 31);
   __ orr(out, out, ShifterOperand(temp, LSL, 1));
   // Z lane.
@@ skipping 13 matching lines @@
     bool opt) const {
   const intptr_t kNumInputs = 4;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_in(2, Location::RequiresFpuRegister());
   summary->set_in(3, Location::RequiresFpuRegister());
   // Low (< 7) Q registers are needed for the vcvtsd instruction.
-  summary->set_out(Location::FpuRegisterLocation(Q6));
+  summary->set_out(0, Location::FpuRegisterLocation(Q6));
   return summary;
 }
 
 
 void Float32x4ConstructorInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister q0 = locs()->in(0).fpu_reg();
   QRegister q1 = locs()->in(1).fpu_reg();
   QRegister q2 = locs()->in(2).fpu_reg();
   QRegister q3 = locs()->in(3).fpu_reg();
-  QRegister r = locs()->out().fpu_reg();
+  QRegister r = locs()->out(0).fpu_reg();
 
   DRegister dr0 = EvenDRegisterOf(r);
   DRegister dr1 = OddDRegisterOf(r);
 
   __ vcvtsd(EvenSRegisterOf(dr0), EvenDRegisterOf(q0));
   __ vcvtsd(OddSRegisterOf(dr0), EvenDRegisterOf(q1));
   __ vcvtsd(EvenSRegisterOf(dr1), EvenDRegisterOf(q2));
   __ vcvtsd(OddSRegisterOf(dr1), EvenDRegisterOf(q3));
 }
 
 
 LocationSummary* Float32x4ZeroInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ZeroInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  QRegister q = locs()->out().fpu_reg();
+  QRegister q = locs()->out(0).fpu_reg();
   __ veorq(q, q, q);
 }
 
 
 LocationSummary* Float32x4SplatInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4SplatInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister value = locs()->in(0).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   DRegister dvalue0 = EvenDRegisterOf(value);
 
   // Convert to Float32.
   __ vcvtsd(STMP, dvalue0);
 
   // Splat across all lanes.
   __ vdup(kWord, result, DTMP, 0);
 }
 
 
 LocationSummary* Float32x4ComparisonInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ComparisonInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister left = locs()->in(0).fpu_reg();
   QRegister right = locs()->in(1).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Equal:
       __ vceqqs(result, left, right);
       break;
     case MethodRecognizer::kFloat32x4NotEqual:
       __ vceqqs(result, left, right);
       // Invert the result.
       __ veorq(QTMP, QTMP, QTMP);  // QTMP <- 0.
       __ vornq(result, QTMP, result);  // result <- ~result.
@@ skipping 16 matching lines @@
 }
 
 
 LocationSummary* Float32x4MinMaxInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4MinMaxInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister left = locs()->in(0).fpu_reg();
   QRegister right = locs()->in(1).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Min:
       __ vminqs(result, left, right);
       break;
     case MethodRecognizer::kFloat32x4Max:
       __ vmaxqs(result, left, right);
       break;
     default: UNREACHABLE();
   }
 }
 
 
 LocationSummary* Float32x4SqrtInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 1;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   summary->set_temp(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4SqrtInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister left = locs()->in(0).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
   QRegister temp = locs()->temp(0).fpu_reg();
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Sqrt:
       __ Vsqrtqs(result, left, temp);
       break;
     case MethodRecognizer::kFloat32x4Reciprocal:
       __ Vreciprocalqs(result, left);
       break;
     case MethodRecognizer::kFloat32x4ReciprocalSqrt:
       __ VreciprocalSqrtqs(result, left);
       break;
     default: UNREACHABLE();
   }
 }
 
 
 LocationSummary* Float32x4ScaleInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ScaleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister left = locs()->in(0).fpu_reg();
   QRegister right = locs()->in(1).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Scale:
       __ vcvtsd(STMP, EvenDRegisterOf(left));
       __ vdup(kWord, result, DTMP, 0);
       __ vmulqs(result, result, right);
       break;
     default: UNREACHABLE();
   }
 }
 
 
 LocationSummary* Float32x4ZeroArgInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ZeroArgInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister left = locs()->in(0).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Negate:
       __ vnegqs(result, left);
       break;
     case MethodRecognizer::kFloat32x4Absolute:
       __ vabsqs(result, left);
       break;
     default: UNREACHABLE();
   }
 }
 
 
 LocationSummary* Float32x4ClampInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 3;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_in(2, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ClampInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister left = locs()->in(0).fpu_reg();
   QRegister lower = locs()->in(1).fpu_reg();
   QRegister upper = locs()->in(2).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
   __ vminqs(result, left, upper);
   __ vmaxqs(result, result, lower);
 }
 
 
 LocationSummary* Float32x4WithInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   // Low (< 7) Q registers are needed for the vmovs instruction.
-  summary->set_out(Location::FpuRegisterLocation(Q6));
+  summary->set_out(0, Location::FpuRegisterLocation(Q6));
   return summary;
 }
 
 
 void Float32x4WithInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister replacement = locs()->in(0).fpu_reg();
   QRegister value = locs()->in(1).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   DRegister dresult0 = EvenDRegisterOf(result);
   DRegister dresult1 = OddDRegisterOf(result);
   SRegister sresult0 = EvenSRegisterOf(dresult0);
   SRegister sresult1 = OddSRegisterOf(dresult0);
   SRegister sresult2 = EvenSRegisterOf(dresult1);
   SRegister sresult3 = OddSRegisterOf(dresult1);
 
   __ vcvtsd(STMP, EvenDRegisterOf(replacement));
   if (result != value) {
@@ skipping 17 matching lines @@
   }
 }
 
 
 LocationSummary* Float32x4ToInt32x4Instr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float32x4ToInt32x4Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister value = locs()->in(0).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   if (value != result) {
     __ vmovq(result, value);
   }
 }
 
 
 LocationSummary* Simd64x2ShuffleInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Simd64x2ShuffleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister value = locs()->in(0).fpu_reg();
 
   DRegister dvalue0 = EvenDRegisterOf(value);
   DRegister dvalue1 = OddDRegisterOf(value);
 
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   DRegister dresult0 = EvenDRegisterOf(result);
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat64x2GetX:
       __ vmovd(dresult0, dvalue0);
       break;
     case MethodRecognizer::kFloat64x2GetY:
       __ vmovd(dresult0, dvalue1);
       break;
     default: UNREACHABLE();
   }
 }
 
 
 LocationSummary* Float64x2ZeroInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float64x2ZeroInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  QRegister q = locs()->out().fpu_reg();
+  QRegister q = locs()->out(0).fpu_reg();
   __ veorq(q, q, q);
 }
 
 
 LocationSummary* Float64x2SplatInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float64x2SplatInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister value = locs()->in(0).fpu_reg();
 
   DRegister dvalue = EvenDRegisterOf(value);
 
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   DRegister dresult0 = EvenDRegisterOf(result);
   DRegister dresult1 = OddDRegisterOf(result);
 
   // Splat across all lanes.
   __ vmovd(dresult0, dvalue);
   __ vmovd(dresult1, dvalue);
 }
 
 
 LocationSummary* Float64x2ConstructorInstr::MakeLocationSummary(
     bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Float64x2ConstructorInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister q0 = locs()->in(0).fpu_reg();
   QRegister q1 = locs()->in(1).fpu_reg();
-  QRegister r = locs()->out().fpu_reg();
+  QRegister r = locs()->out(0).fpu_reg();
 
   DRegister d0 = EvenDRegisterOf(q0);
   DRegister d1 = EvenDRegisterOf(q1);
 
   DRegister dr0 = EvenDRegisterOf(r);
   DRegister dr1 = OddDRegisterOf(r);
 
   __ vmovd(dr0, d0);
   __ vmovd(dr1, d1);
 }
 
 
 LocationSummary* Float64x2ToFloat32x4Instr::MakeLocationSummary(
     bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   // Low (< 7) Q registers are needed for the vcvtsd instruction.
-  summary->set_out(Location::FpuRegisterLocation(Q6));
+  summary->set_out(0, Location::FpuRegisterLocation(Q6));
   return summary;
 }
 
 
 void Float64x2ToFloat32x4Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister q = locs()->in(0).fpu_reg();
-  QRegister r = locs()->out().fpu_reg();
+  QRegister r = locs()->out(0).fpu_reg();
 
   DRegister dq0 = EvenDRegisterOf(q);
   DRegister dq1 = OddDRegisterOf(q);
 
   DRegister dr0 = EvenDRegisterOf(r);
 
   // Zero register.
   __ veorq(r, r, r);
   // Set X lane.
   __ vcvtsd(EvenSRegisterOf(dr0), dq0);
   // Set Y lane.
   __ vcvtsd(OddSRegisterOf(dr0), dq1);
 }
 
 
 LocationSummary* Float32x4ToFloat64x2Instr::MakeLocationSummary(
     bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   // Low (< 7) Q registers are needed for the vcvtsd instruction.
-  summary->set_out(Location::FpuRegisterLocation(Q6));
+  summary->set_out(0, Location::FpuRegisterLocation(Q6));
   return summary;
 }
 
 
 void Float32x4ToFloat64x2Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister q = locs()->in(0).fpu_reg();
-  QRegister r = locs()->out().fpu_reg();
+  QRegister r = locs()->out(0).fpu_reg();
 
   DRegister dq0 = EvenDRegisterOf(q);
 
   DRegister dr0 = EvenDRegisterOf(r);
   DRegister dr1 = OddDRegisterOf(r);
 
   // Set X.
   __ vcvtds(dr0, EvenSRegisterOf(dq0));
   // Set Y.
   __ vcvtds(dr1, OddSRegisterOf(dq0));
 }
 
 
 LocationSummary* Float64x2ZeroArgInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
 
   if (representation() == kTagged) {
     ASSERT(op_kind() == MethodRecognizer::kFloat64x2GetSignMask);
     // Grabbing the S components means we need a low (< 7) Q.
     summary->set_in(0, Location::FpuRegisterLocation(Q6));
-    summary->set_out(Location::RequiresRegister());
+    summary->set_out(0, Location::RequiresRegister());
     summary->AddTemp(Location::RequiresRegister());
   } else {
     summary->set_in(0, Location::RequiresFpuRegister());
-    summary->set_out(Location::RequiresFpuRegister());
+    summary->set_out(0, Location::RequiresFpuRegister());
   }
   return summary;
 }
 
 
 void Float64x2ZeroArgInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister q = locs()->in(0).fpu_reg();
 
   if ((op_kind() == MethodRecognizer::kFloat64x2GetSignMask)) {
     DRegister dvalue0 = EvenDRegisterOf(q);
     DRegister dvalue1 = OddDRegisterOf(q);
 
-    Register out = locs()->out().reg();
+    Register out = locs()->out(0).reg();
     Register temp = locs()->temp(0).reg();
 
     // Upper 32-bits of X lane.
     __ vmovrs(out, OddSRegisterOf(dvalue0));
     __ Lsr(out, out, 31);
     // Upper 32-bits of Y lane.
     __ vmovrs(temp, OddSRegisterOf(dvalue1));
     __ Lsr(temp, temp, 31);
     __ orr(out, out, ShifterOperand(temp, LSL, 1));
     // Tag.
     __ SmiTag(out);
     return;
   }
   ASSERT(representation() == kUnboxedFloat64x2);
-  QRegister r = locs()->out().fpu_reg();
+  QRegister r = locs()->out(0).fpu_reg();
 
   DRegister dvalue0 = EvenDRegisterOf(q);
   DRegister dvalue1 = OddDRegisterOf(q);
   DRegister dresult0 = EvenDRegisterOf(r);
   DRegister dresult1 = OddDRegisterOf(r);
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat64x2Negate:
       __ vnegd(dresult0, dvalue0);
       __ vnegd(dresult1, dvalue1);
@@ skipping 11 matching lines @@
 }
 
 
 LocationSummary* Float64x2OneArgInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
-  summary->set_out(Location::SameAsFirstInput());
+  summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void Float64x2OneArgInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister left = locs()->in(0).fpu_reg();
   DRegister left0 = EvenDRegisterOf(left);
   DRegister left1 = OddDRegisterOf(left);
   QRegister right = locs()->in(1).fpu_reg();
   DRegister right0 = EvenDRegisterOf(right);
   DRegister right1 = OddDRegisterOf(right);
-  QRegister out = locs()->out().fpu_reg();
+  QRegister out = locs()->out(0).fpu_reg();
   ASSERT(left == out);
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat64x2Scale:
       __ vmuld(left0, left0, right0);
       __ vmuld(left1, left1, right0);
       break;
     case MethodRecognizer::kFloat64x2WithX:
       __ vmovd(left0, right0);
       break;
@@ skipping 44 matching lines @@
   const intptr_t kNumInputs = 4;
   const intptr_t kNumTemps = 1;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   summary->set_in(1, Location::RequiresRegister());
   summary->set_in(2, Location::RequiresRegister());
   summary->set_in(3, Location::RequiresRegister());
   summary->set_temp(0, Location::RequiresRegister());
   // Low (< 7) Q register needed for the vmovsr instruction.
-  summary->set_out(Location::FpuRegisterLocation(Q6));
+  summary->set_out(0, Location::FpuRegisterLocation(Q6));
   return summary;
 }
 
 
 void Int32x4BoolConstructorInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register v0 = locs()->in(0).reg();
   Register v1 = locs()->in(1).reg();
   Register v2 = locs()->in(2).reg();
   Register v3 = locs()->in(3).reg();
   Register temp = locs()->temp(0).reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
   DRegister dresult0 = EvenDRegisterOf(result);
   DRegister dresult1 = OddDRegisterOf(result);
   SRegister sresult0 = EvenSRegisterOf(dresult0);
   SRegister sresult1 = OddSRegisterOf(dresult0);
   SRegister sresult2 = EvenSRegisterOf(dresult1);
   SRegister sresult3 = OddSRegisterOf(dresult1);
 
   __ veorq(result, result, result);
   __ LoadImmediate(temp, 0xffffffff);
 
@@ skipping 11 matching lines @@
 }
 
 
 LocationSummary* Int32x4GetFlagInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   // Low (< 7) Q registers are needed for the vmovrs instruction.
   summary->set_in(0, Location::FpuRegisterLocation(Q6));
-  summary->set_out(Location::RequiresRegister());
+  summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void Int32x4GetFlagInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister value = locs()->in(0).fpu_reg();
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
 
   DRegister dvalue0 = EvenDRegisterOf(value);
   DRegister dvalue1 = OddDRegisterOf(value);
   SRegister svalue0 = EvenSRegisterOf(dvalue0);
   SRegister svalue1 = OddSRegisterOf(dvalue0);
   SRegister svalue2 = EvenSRegisterOf(dvalue1);
   SRegister svalue3 = OddSRegisterOf(dvalue1);
 
   switch (op_kind()) {
     case MethodRecognizer::kInt32x4GetFlagX:
@@ skipping 19 matching lines @@
 
 LocationSummary* Int32x4SelectInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 3;
   const intptr_t kNumTemps = 1;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
   summary->set_in(2, Location::RequiresFpuRegister());
   summary->set_temp(0, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Int32x4SelectInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister mask = locs()->in(0).fpu_reg();
   QRegister trueValue = locs()->in(1).fpu_reg();
   QRegister falseValue = locs()->in(2).fpu_reg();
-  QRegister out = locs()->out().fpu_reg();
+  QRegister out = locs()->out(0).fpu_reg();
   QRegister temp = locs()->temp(0).fpu_reg();
 
   // Copy mask.
   __ vmovq(temp, mask);
   // Invert it.
   __ veorq(QTMP, QTMP, QTMP);  // QTMP <- 0.
   __ vornq(temp, QTMP, temp);  //  temp <- ~temp.
   // mask = mask & trueValue.
   __ vandq(mask, mask, trueValue);
   // temp = temp & falseValue.
   __ vandq(temp, temp, falseValue);
   // out = mask | temp.
   __ vorrq(out, mask, temp);
 }
 
 
 LocationSummary* Int32x4SetFlagInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresRegister());
   // Low (< 7) Q register needed for the vmovsr instruction.
-  summary->set_out(Location::FpuRegisterLocation(Q6));
+  summary->set_out(0, Location::FpuRegisterLocation(Q6));
   return summary;
 }
 
 
 void Int32x4SetFlagInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister mask = locs()->in(0).fpu_reg();
   Register flag = locs()->in(1).reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   DRegister dresult0 = EvenDRegisterOf(result);
   DRegister dresult1 = OddDRegisterOf(result);
   SRegister sresult0 = EvenSRegisterOf(dresult0);
   SRegister sresult1 = OddSRegisterOf(dresult0);
   SRegister sresult2 = EvenSRegisterOf(dresult1);
   SRegister sresult3 = OddSRegisterOf(dresult1);
 
   if (result != mask) {
     __ vmovq(result, mask);
@@ skipping 19 matching lines @@
   }
 }
 
 
 LocationSummary* Int32x4ToFloat32x4Instr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void Int32x4ToFloat32x4Instr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister value = locs()->in(0).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
 
   if (value != result) {
     __ vmovq(result, value);
   }
 }
 
 
 LocationSummary* BinaryInt32x4OpInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_in(1, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void BinaryInt32x4OpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister left = locs()->in(0).fpu_reg();
   QRegister right = locs()->in(1).fpu_reg();
-  QRegister result = locs()->out().fpu_reg();
+  QRegister result = locs()->out(0).fpu_reg();
   switch (op_kind()) {
     case Token::kBIT_AND: {
       __ vandq(result, left, right);
       break;
     }
     case Token::kBIT_OR: {
       __ vorrq(result, left, right);
       break;
     }
     case Token::kBIT_XOR: {
@@ skipping 12 matching lines @@
 
 
 LocationSummary* MathUnaryInstr::MakeLocationSummary(bool opt) const {
   if ((kind() == MethodRecognizer::kMathSin) ||
       (kind() == MethodRecognizer::kMathCos)) {
     const intptr_t kNumInputs = 1;
     const intptr_t kNumTemps = 0;
     LocationSummary* summary =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
     summary->set_in(0, Location::FpuRegisterLocation(Q0));
-    summary->set_out(Location::FpuRegisterLocation(Q0));
+    summary->set_out(0, Location::FpuRegisterLocation(Q0));
 #if !defined(ARM_FLOAT_ABI_HARD)
     summary->AddTemp(Location::RegisterLocation(R0));
     summary->AddTemp(Location::RegisterLocation(R1));
     summary->AddTemp(Location::RegisterLocation(R2));
     summary->AddTemp(Location::RegisterLocation(R3));
 #endif
     return summary;
   }
   // Sqrt.
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void MathUnaryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   if (kind() == MethodRecognizer::kMathSqrt) {
     DRegister val = EvenDRegisterOf(locs()->in(0).fpu_reg());
-    DRegister result = EvenDRegisterOf(locs()->out().fpu_reg());
+    DRegister result = EvenDRegisterOf(locs()->out(0).fpu_reg());
     __ vsqrtd(result, val);
   } else {
 #if defined(ARM_FLOAT_ABI_HARD)
     __ CallRuntime(TargetFunction(), InputCount());
 #else
     // If we aren't doing "hardfp", then we have to move the double arguments
     // to the integer registers, and take the results from the integer
     // registers.
     __ vmovrrd(R0, R1, D0);
     __ vmovrrd(R2, R3, D1);
     __ CallRuntime(TargetFunction(), InputCount());
     __ vmovdrr(D0, R0, R1);
     __ vmovdrr(D1, R2, R3);
 #endif
   }
 }
 
 
 LocationSummary* MathMinMaxInstr::MakeLocationSummary(bool opt) const {
   if (result_cid() == kDoubleCid) {
     const intptr_t kNumInputs = 2;
     const intptr_t kNumTemps = 1;
     LocationSummary* summary =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresFpuRegister());
     summary->set_in(1, Location::RequiresFpuRegister());
     // Reuse the left register so that code can be made shorter.
-    summary->set_out(Location::SameAsFirstInput());
+    summary->set_out(0, Location::SameAsFirstInput());
     summary->set_temp(0, Location::RequiresRegister());
     return summary;
   }
   ASSERT(result_cid() == kSmiCid);
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   summary->set_in(1, Location::RequiresRegister());
   // Reuse the left register so that code can be made shorter.
-  summary->set_out(Location::SameAsFirstInput());
+  summary->set_out(0, Location::SameAsFirstInput());
   return summary;
 }
 
 
 void MathMinMaxInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT((op_kind() == MethodRecognizer::kMathMin) ||
          (op_kind() == MethodRecognizer::kMathMax));
   const intptr_t is_min = (op_kind() == MethodRecognizer::kMathMin);
   if (result_cid() == kDoubleCid) {
     Label done, returns_nan, are_equal;
     DRegister left = EvenDRegisterOf(locs()->in(0).fpu_reg());
     DRegister right = EvenDRegisterOf(locs()->in(1).fpu_reg());
-    DRegister result = EvenDRegisterOf(locs()->out().fpu_reg());
+    DRegister result = EvenDRegisterOf(locs()->out(0).fpu_reg());
     Register temp = locs()->temp(0).reg();
     __ vcmpd(left, right);
     __ vmstat();
     __ b(&returns_nan, VS);
     __ b(&are_equal, EQ);
     const Condition neg_double_condition =
         is_min ? TokenKindToDoubleCondition(Token::kGTE)
                : TokenKindToDoubleCondition(Token::kLTE);
     ASSERT(left == result);
     __ vmovd(result, right, neg_double_condition);
@@ skipping 19 matching lines @@
       __ vmovd(result, right, LT);
       ASSERT(left == result);
     }
     __ Bind(&done);
     return;
   }
 
   ASSERT(result_cid() == kSmiCid);
   Register left = locs()->in(0).reg();
   Register right = locs()->in(1).reg();
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   __ cmp(left, ShifterOperand(right));
   ASSERT(result == left);
   if (is_min) {
     __ mov(result, ShifterOperand(right), GT);
   } else {
     __ mov(result, ShifterOperand(right), LT);
   }
 }
 
 
 LocationSummary* UnarySmiOpInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   // We make use of 3-operand instructions by not requiring result register
   // to be identical to first input register as on Intel.
-  summary->set_out(Location::RequiresRegister());
+  summary->set_out(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void UnarySmiOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   switch (op_kind()) {
     case Token::kNEGATE: {
       Label* deopt = compiler->AddDeoptStub(deopt_id(),
                                             kDeoptUnaryOp);
       __ rsbs(result, value, ShifterOperand(0));
       __ b(deopt, VS);
       break;
     }
     case Token::kBIT_NOT:
       __ mvn(result, ShifterOperand(value));
       // Remove inverted smi-tag.
       __ bic(result, result, ShifterOperand(kSmiTagMask));
       break;
     default:
       UNREACHABLE();
   }
 }
 
 
 LocationSummary* UnaryDoubleOpInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
-  summary->set_out(Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void UnaryDoubleOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  DRegister result = EvenDRegisterOf(locs()->out().fpu_reg());
+  DRegister result = EvenDRegisterOf(locs()->out(0).fpu_reg());
   DRegister value = EvenDRegisterOf(locs()->in(0).fpu_reg());
   __ vnegd(result, value);
 }
 
 
 LocationSummary* SmiToDoubleInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* result =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   result->set_in(0, Location::WritableRegister());
-  result->set_out(Location::RequiresFpuRegister());
+  result->set_out(0, Location::RequiresFpuRegister());
   return result;
 }
 
 
 void SmiToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
-  DRegister result = EvenDRegisterOf(locs()->out().fpu_reg());
+  DRegister result = EvenDRegisterOf(locs()->out(0).fpu_reg());
   __ SmiUntag(value);
   __ vmovsr(STMP, value);
   __ vcvtdi(result, STMP);
 }
 
 
 LocationSummary* DoubleToIntegerInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* result =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
   result->set_in(0, Location::RegisterLocation(R1));
-  result->set_out(Location::RegisterLocation(R0));
+  result->set_out(0, Location::RegisterLocation(R0));
   return result;
 }
 
 
 void DoubleToIntegerInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   Register value_obj = locs()->in(0).reg();
   ASSERT(result == R0);
   ASSERT(result != value_obj);
   __ LoadDFromOffset(DTMP, value_obj, Double::value_offset() - kHeapObjectTag);
 
   Label do_call, done;
   // First check for NaN. Checking for minint after the conversion doesn't work
   // on ARM because vcvtid gives 0 for NaN.
   __ vcmpd(DTMP, DTMP);
   __ vmstat();
@@ skipping 25 matching lines @@
   __ Bind(&done);
 }
 
 
 LocationSummary* DoubleToSmiInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* result = new LocationSummary(
       kNumInputs, kNumTemps, LocationSummary::kNoCall);
   result->set_in(0, Location::RequiresFpuRegister());
-  result->set_out(Location::RequiresRegister());
+  result->set_out(0, Location::RequiresRegister());
   return result;
 }
 
 
 void DoubleToSmiInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Label* deopt = compiler->AddDeoptStub(deopt_id(), kDeoptDoubleToSmi);
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   DRegister value = EvenDRegisterOf(locs()->in(0).fpu_reg());
   // First check for NaN. Checking for minint after the conversion doesn't work
   // on ARM because vcvtid gives 0 for NaN.
   __ vcmpd(value, value);
   __ vmstat();
   __ b(deopt, VS);
 
   __ vcvtid(STMP, value);
   __ vmovrs(result, STMP);
   // Check for overflow and that it fits into Smi.
@@ skipping 14 matching lines @@
 }
 
 
 LocationSummary* DoubleToFloatInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* result =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   // Low (<= Q7) Q registers are needed for the conversion instructions.
   result->set_in(0, Location::RequiresFpuRegister());
-  result->set_out(Location::FpuRegisterLocation(Q7));
+  result->set_out(0, Location::FpuRegisterLocation(Q7));
   return result;
 }
 
 
 void DoubleToFloatInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   DRegister value = EvenDRegisterOf(locs()->in(0).fpu_reg());
-  SRegister result = EvenSRegisterOf(EvenDRegisterOf(locs()->out().fpu_reg()));
+  SRegister result = EvenSRegisterOf(EvenDRegisterOf(locs()->out(0).fpu_reg()));
   __ vcvtsd(result, value);
 }
 
 
 LocationSummary* FloatToDoubleInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* result =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   // Low (<= Q7) Q registers are needed for the conversion instructions.
   result->set_in(0, Location::FpuRegisterLocation(Q7));
-  result->set_out(Location::RequiresFpuRegister());
+  result->set_out(0, Location::RequiresFpuRegister());
   return result;
 }
 
 
 void FloatToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   SRegister value = EvenSRegisterOf(EvenDRegisterOf(locs()->in(0).fpu_reg()));
-  DRegister result = EvenDRegisterOf(locs()->out().fpu_reg());
+  DRegister result = EvenDRegisterOf(locs()->out(0).fpu_reg());
   __ vcvtds(result, value);
 }
 
 
 LocationSummary* InvokeMathCFunctionInstr::MakeLocationSummary(bool opt) const {
   ASSERT((InputCount() == 1) || (InputCount() == 2));
   const intptr_t kNumTemps = 0;
   LocationSummary* result =
       new LocationSummary(InputCount(), kNumTemps, LocationSummary::kCall);
   result->set_in(0, Location::FpuRegisterLocation(Q0));
   if (InputCount() == 2) {
     result->set_in(1, Location::FpuRegisterLocation(Q1));
   }
   if (recognized_kind() == MethodRecognizer::kMathDoublePow) {
     result->AddTemp(Location::RegisterLocation(R2));
     result->AddTemp(Location::FpuRegisterLocation(Q2));
   }
 #if !defined(ARM_FLOAT_ABI_HARD)
   result->AddTemp(Location::RegisterLocation(R0));
   result->AddTemp(Location::RegisterLocation(R1));
   // Check if R2 is already added.
   if (recognized_kind() != MethodRecognizer::kMathDoublePow) {
     result->AddTemp(Location::RegisterLocation(R2));
   }
   result->AddTemp(Location::RegisterLocation(R3));
 #endif
-  result->set_out(Location::FpuRegisterLocation(Q0));
+  result->set_out(0, Location::FpuRegisterLocation(Q0));
   return result;
 }
 
 
 void InvokeMathCFunctionInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // For pow-function return NaN if exponent is NaN.
   Label do_call, skip_call;
   if (recognized_kind() == MethodRecognizer::kMathDoublePow) {
     // Pseudo code:
     // if (exponent == 0.0) return 0.0;
     // if (base == 1.0) return 1.0;
     // if (base.isNaN || exponent.isNaN) {
     //    return double.NAN;
     // }
     DRegister base = EvenDRegisterOf(locs()->in(0).fpu_reg());
     DRegister exp = EvenDRegisterOf(locs()->in(1).fpu_reg());
-    DRegister result = EvenDRegisterOf(locs()->out().fpu_reg());
+    DRegister result = EvenDRegisterOf(locs()->out(0).fpu_reg());
     Register temp = locs()->temp(0).reg();
     DRegister saved_base = EvenDRegisterOf(locs()->temp(1).fpu_reg());
     ASSERT((base == result) && (result != saved_base));
     Label check_base_is_one;
     // Check if exponent is 0.0 -> return 1.0;
     __ vmovd(saved_base, base);
     __ LoadObject(temp, Double::ZoneHandle(Double::NewCanonical(0)));
     __ LoadDFromOffset(DTMP, temp, Double::value_offset() - kHeapObjectTag);
     __ LoadObject(temp, Double::ZoneHandle(Double::NewCanonical(1)));
     __ LoadDFromOffset(result, temp, Double::value_offset() - kHeapObjectTag);
@@ skipping 36 matching lines @@
     const intptr_t kNumInputs = 2;
     const intptr_t kNumTemps = 4;
     LocationSummary* summary =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
     summary->set_in(0, Location::RequiresRegister());
     summary->set_in(1, Location::RequiresRegister());
     summary->set_temp(0, Location::RequiresRegister());
     summary->set_temp(1, Location::RequiresFpuRegister());
     summary->set_temp(2, Location::RequiresRegister());  // result_div.
     summary->set_temp(3, Location::RequiresRegister());  // result_mod.
-    summary->set_out(Location::RequiresRegister());
+    summary->set_out(0, Location::RequiresRegister());
     return summary;
   }
   UNIMPLEMENTED();
   return NULL;
 }
 
 
 void MergedMathInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Label* deopt = NULL;
   if (CanDeoptimize()) {
     deopt = compiler->AddDeoptStub(deopt_id(), kDeoptBinarySmiOp);
   }
   if (kind() == MergedMathInstr::kTruncDivMod) {
     Register left = locs()->in(0).reg();
     Register right = locs()->in(1).reg();
-    Register result = locs()->out().reg();
+    Register result = locs()->out(0).reg();
     Range* right_range = InputAt(1)->definition()->range();
     if ((right_range == NULL) || right_range->Overlaps(0, 0)) {
       // Handle divide by zero in runtime.
       __ cmp(right, ShifterOperand(0));
       __ b(deopt, EQ);
     }
     Register temp = locs()->temp(0).reg();
     DRegister dtemp = EvenDRegisterOf(locs()->temp(1).fpu_reg());
     Register result_div = locs()->temp(2).reg();
     Register result_mod = locs()->temp(3).reg();
@@ skipping 87 matching lines @@
                             deopt,
                             deopt_id(),
                             instance_call()->token_pos(),
                             locs());
 }
 
 
 LocationSummary* BranchInstr::MakeLocationSummary(bool opt) const {
   comparison()->InitializeLocationSummary(opt);
   // Branches don't produce a result.
-  comparison()->locs()->set_out(Location::NoLocation());
+  comparison()->locs()->set_out(0, Location::NoLocation());
   return comparison()->locs();
 }
 
 
 void BranchInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   comparison()->EmitBranchCode(compiler, this);
 }
 
 
 LocationSummary* CheckClassInstr::MakeLocationSummary(bool opt) const {
@@ skipping 263 matching lines @@
 
 
 LocationSummary* CurrentContextInstr::MakeLocationSummary(bool opt) const {
   return LocationSummary::Make(0,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void CurrentContextInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  __ mov(locs()->out().reg(), ShifterOperand(CTX));
+  __ mov(locs()->out(0).reg(), ShifterOperand(CTX));
 }
 
 
 LocationSummary* StrictCompareInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   if (needs_number_check()) {
     LocationSummary* locs =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
     locs->set_in(0, Location::RegisterLocation(R0));
     locs->set_in(1, Location::RegisterLocation(R1));
-    locs->set_out(Location::RegisterLocation(R0));
+    locs->set_out(0, Location::RegisterLocation(R0));
     return locs;
   }
   LocationSummary* locs =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   locs->set_in(0, Location::RegisterOrConstant(left()));
   // Only one of the inputs can be a constant. Choose register if the first one
   // is a constant.
   locs->set_in(1, locs->in(0).IsConstant()
                       ? Location::RequiresRegister()
                       : Location::RegisterOrConstant(right()));
-  locs->set_out(Location::RequiresRegister());
+  locs->set_out(0, Location::RequiresRegister());
   return locs;
 }
 
 
 Condition StrictCompareInstr::EmitComparisonCode(FlowGraphCompiler* compiler,
                                                  BranchLabels labels) {
   Location left = locs()->in(0);
   Location right = locs()->in(1);
   ASSERT(!left.IsConstant() || !right.IsConstant());
   if (left.IsConstant()) {
@@ skipping 17 matching lines @@
 }
 
 
 void StrictCompareInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(kind() == Token::kEQ_STRICT || kind() == Token::kNE_STRICT);
 
   // The ARM code does not use true- and false-labels here.
   BranchLabels labels = { NULL, NULL, NULL };
   Condition true_condition = EmitComparisonCode(compiler, labels);
 
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
   __ LoadObject(result, Bool::True(), true_condition);
   __ LoadObject(result, Bool::False(), NegateCondition(true_condition));
 }
 
 
 void StrictCompareInstr::EmitBranchCode(FlowGraphCompiler* compiler,
                                         BranchInstr* branch) {
   ASSERT(kind() == Token::kEQ_STRICT || kind() == Token::kNE_STRICT);
 
   BranchLabels labels = compiler->CreateBranchLabels(branch);
   Condition true_condition = EmitComparisonCode(compiler, labels);
   EmitBranchOnCondition(compiler, true_condition, labels);
 }
 
 
 LocationSummary* BooleanNegateInstr::MakeLocationSummary(bool opt) const {
   return LocationSummary::Make(1,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void BooleanNegateInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
-  Register result = locs()->out().reg();
+  Register result = locs()->out(0).reg();
 
   __ LoadObject(result, Bool::True());
   __ cmp(result, ShifterOperand(value));
   __ LoadObject(result, Bool::False(), EQ);
 }
 
 
 LocationSummary* AllocateObjectInstr::MakeLocationSummary(bool opt) const {
   return MakeCallSummary();
 }
 
 
 void AllocateObjectInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Code& stub = Code::Handle(StubCode::GetAllocationStubForClass(cls()));
   const ExternalLabel label(cls().ToCString(), stub.EntryPoint());
   compiler->GenerateCall(token_pos(),
                          &label,
                          PcDescriptors::kOther,
                          locs());
   __ Drop(ArgumentCount());  // Discard arguments.
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM