VM: Intrinsify double arithmetic operations with a smi rhs.

runtime/vm/intrinsifier_x64.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_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 1277 matching lines @@
 
 
 void Intrinsifier::Double_lessEqualThan(Assembler* assembler) {
   CompareDoubles(assembler, BELOW_EQUAL);
 }
 
 
 // Expects left argument to be double (receiver). Right argument is unknown.
 // Both arguments are on stack.
 static void DoubleArithmeticOperations(Assembler* assembler, Token::Kind kind) {
-  Label fall_through;
-  TestLastArgumentIsDouble(assembler, &fall_through, &fall_through);
+  Label fall_through, is_smi, double_op;
+  TestLastArgumentIsDouble(assembler, &is_smi, &fall_through);
   // Both arguments are double, right operand is in RAX.
   __ movsd(XMM1, FieldAddress(RAX, Double::value_offset()));
+  __ Bind(&double_op);
   __ movq(RAX, Address(RSP, + 2 * kWordSize));  // Left argument.
   __ movsd(XMM0, FieldAddress(RAX, Double::value_offset()));
   switch (kind) {
     case Token::kADD: __ addsd(XMM0, XMM1); break;
     case Token::kSUB: __ subsd(XMM0, XMM1); break;
     case Token::kMUL: __ mulsd(XMM0, XMM1); break;
     case Token::kDIV: __ divsd(XMM0, XMM1); break;
     default: UNREACHABLE();
   }
   const Class& double_class = Class::Handle(
       Isolate::Current()->object_store()->double_class());
   __ TryAllocate(double_class,
                  &fall_through,
                  Assembler::kFarJump,
                  RAX,  // Result register.
                  R13);
   __ movsd(FieldAddress(RAX, Double::value_offset()), XMM0);
   __ ret();
+  __ Bind(&is_smi);
+  __ SmiUntag(RAX);
+  __ cvtsi2sdq(XMM1, RAX);
+  __ jmp(&double_op);
   __ Bind(&fall_through);
 }
 
 
 void Intrinsifier::Double_add(Assembler* assembler) {
   DoubleArithmeticOperations(assembler, Token::kADD);
 }
 
 
 void Intrinsifier::Double_mul(Assembler* assembler) {
@@ skipping 770 matching lines @@
   __ LoadIsolate(RAX);
   __ movq(RAX, Address(RAX, Isolate::current_tag_offset()));
   __ ret();
 }
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64