Add DoubleTestOp instruction

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 1416 matching lines @@
   __ comisd(XMM0, XMM0);
   __ j(PARITY_EVEN, &is_true, Assembler::kNearJump);  // NaN -> true;
   __ LoadObject(RAX, Bool::False());
   __ ret();
   __ Bind(&is_true);
   __ LoadObject(RAX, Bool::True());
   __ ret();
 }
 
 
+void Intrinsifier::Double_getIsInfinite(Assembler* assembler) {
+  Label is_inf, done;
+  __ movq(RAX, Address(RSP, +1 * kWordSize));
+  __ movq(RAX, FieldAddress(RAX, Double::value_offset()));
+  // Mask off the sign.
+  __ AndImmediate(RAX, Immediate(0x7FFFFFFFFFFFFFFFLL));
+  // Compare with +infinity.
+  __ CompareImmediate(RAX, Immediate(0x7FF0000000000000LL));
+  __ j(EQUAL, &is_inf, Assembler::kNearJump);
+  __ LoadObject(RAX, Bool::False());
+  __ jmp(&done);
+
+  __ Bind(&is_inf);
+  __ LoadObject(RAX, Bool::True());
+
+  __ Bind(&done);
+  __ ret();
+}
+
+
 void Intrinsifier::Double_getIsNegative(Assembler* assembler) {
   Label is_false, is_true, is_zero;
   __ movq(RAX, Address(RSP, +1 * kWordSize));
   __ movsd(XMM0, FieldAddress(RAX, Double::value_offset()));
   __ xorpd(XMM1, XMM1);  // 0.0 -> XMM1.
   __ comisd(XMM0, XMM1);
   __ j(PARITY_EVEN, &is_false, Assembler::kNearJump);  // NaN -> false.
   __ j(EQUAL, &is_zero, Assembler::kNearJump);  // Check for negative zero.
   __ j(ABOVE_EQUAL, &is_false, Assembler::kNearJump);  // >= 0 -> false.
   __ Bind(&is_true);
@@ skipping 677 matching lines @@
   __ Bind(&true_label);
   __ LoadObject(RAX, Bool::True());
   __ ret();
 }
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64