Intrinsify Double.toInt.

runtime/vm/intrinsifier_x64.cc

 // Copyright (c) 2012, 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 1140 matching lines @@
   __ jmp(&double_op);
 
   __ Bind(&alloc_failed);
   __ ffree(0);
   __ fincstp();
 
   __ Bind(&fall_through);
 }
 
 
+bool Intrinsifier::Double_toInt(Assembler* assembler) {
+  __ movq(RAX, Address(RSP, +1 * kWordSize));
+  __ movsd(XMM0, FieldAddress(RAX, Double::value_offset()));
+  __ cvttsd2siq(RAX, XMM0);
+  // Overflow is signalled with minint.
+  Label fall_through;
+  // Check for overflow and that it fits into Smi.
+  __ cmpq(RAX, Immediate(0xC000000000000000));
+  __ j(NEGATIVE, &fall_through, Assembler::kNearJump);
+  __ SmiTag(RAX);
+  __ ret();
+  __ Bind(&fall_through);
+  return false;
+}
+
+
 bool Intrinsifier::Math_sqrt(Assembler* assembler) {
   Label fall_through, is_smi, double_op;
   TestLastArgumentIsDouble(assembler, &is_smi, &fall_through);
   // Argument is double and is in RAX.
   __ movsd(XMM1, FieldAddress(RAX, Double::value_offset()));
   __ Bind(&double_op);
   __ sqrtsd(XMM0, XMM1);
   const Class& double_class = Class::Handle(
       Isolate::Current()->object_store()->double_class());
   AssemblerMacros::TryAllocate(assembler,
@@ skipping 191 matching lines @@
   __ LoadObject(RAX, bool_true);
   __ ret();
   return true;
 }
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64