[builtins] Introduce proper Float64Exp operator.

src/crankshaft/arm/lithium-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/arm/lithium-arm.h"
 
 #include <sstream>
 
 #include "src/crankshaft/arm/lithium-codegen-arm.h"
 #include "src/crankshaft/hydrogen-osr.h"
@@ skipping 1120 matching lines @@
 LInstruction* LChunkBuilder::DoMathClz32(HUnaryMathOperation* instr) {
   LOperand* input = UseRegisterAtStart(instr->value());
   LMathClz32* result = new(zone()) LMathClz32(input);
   return DefineAsRegister(result);
 }
 
 
 LInstruction* LChunkBuilder::DoMathExp(HUnaryMathOperation* instr) {
   DCHECK(instr->representation().IsDouble());
   DCHECK(instr->value()->representation().IsDouble());
-  LOperand* input = UseRegister(instr->value());
-  LOperand* temp1 = TempRegister();
-  LOperand* temp2 = TempRegister();
-  LOperand* double_temp = TempDoubleRegister();
-  LMathExp* result = new(zone()) LMathExp(input, double_temp, temp1, temp2);
-  return DefineAsRegister(result);
+  LOperand* input = UseFixedDouble(instr->value(), d0);
+  return MarkAsCall(DefineFixedDouble(new (zone()) LMathExp(input), d0), instr);
 }
 
 
 LInstruction* LChunkBuilder::DoMathSqrt(HUnaryMathOperation* instr) {
   LOperand* input = UseRegisterAtStart(instr->value());
   LMathSqrt* result = new(zone()) LMathSqrt(input);
   return DefineAsRegister(result);
 }
 
 
@@ skipping 1343 matching lines @@
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseTempRegister(instr->index());
   LLoadFieldByIndex* load = new(zone()) LLoadFieldByIndex(object, index);
   LInstruction* result = DefineSameAsFirst(load);
   return AssignPointerMap(result);
 }
 
 }  // namespace internal
 }  // namespace v8