Intrinsify Double.toInt.

runtime/vm/intrinsifier_x64.cc

Index: runtime/vm/intrinsifier_x64.cc
===================================================================
--- runtime/vm/intrinsifier_x64.cc	(revision 12015)
+++ runtime/vm/intrinsifier_x64.cc	(working copy)
@@ -1158,6 +1158,22 @@
 }
 
 
+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);