Add DoubleTestOp instruction

runtime/vm/intermediate_language_ia32.cc

Index: runtime/vm/intermediate_language_ia32.cc
diff --git a/runtime/vm/intermediate_language_ia32.cc b/runtime/vm/intermediate_language_ia32.cc
index 50027124042b40695299f94bd3dcdf134f4bdeb6..4ee2d4f48c047b95ddc0300e80fcf002a2626f3c 100644
--- a/runtime/vm/intermediate_language_ia32.cc
+++ b/runtime/vm/intermediate_language_ia32.cc
@@ -3899,6 +3899,56 @@ void BinaryDoubleOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 }
 
 
+LocationSummary* DoubleTestOpInstr::MakeLocationSummary(Zone* zone,
+                                                        bool opt) const {
+  const intptr_t kNumInputs = 1;
+  const intptr_t kNumTemps = 0;
+  LocationSummary* summary = new(zone) LocationSummary(
+      zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  summary->set_in(0, Location::RequiresFpuRegister());
+  summary->set_out(0, Location::RequiresRegister());
+  return summary;
+}
+
+
+void DoubleTestOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  ASSERT(compiler->is_optimizing());
+  const XmmRegister value = locs()->in(0).fpu_reg();
+  const Register result = locs()->out(0).reg();
+  if (op_kind() == MethodRecognizer::kDoubleIsNaN) {
+    Label is_nan;
+    __ LoadObject(result, Bool::True());
+    __ comisd(value, value);
+    __ j(PARITY_EVEN, &is_nan, Assembler::kNearJump);
+    __ LoadObject(result, Bool::False());
+    __ Bind(&is_nan);
+  } else {
+    ASSERT(op_kind() == MethodRecognizer::kDoubleIsInfinite);
+    Label not_inf, done;
+    __ AddImmediate(ESP, Immediate(-8));

[Florian Schneider, 2016/10/18 20:34:20]

s/-8/-kDoubleSize/

[zra, 2016/10/18 22:36:32]

Done.

+    __ movsd(Address(ESP, 0), value);
+    __ movl(result, Address(ESP, 0));
+    // If the low word isn't zero, then it isn't infinity.
+    __ cmpl(result, Immediate(0));
+    __ j(NOT_EQUAL, &not_inf, Assembler::kNearJump);
+    // Check the high word.
+    __ movl(result, Address(ESP, kWordSize));
+    // Mask off sign bit.
+    __ andl(result, Immediate(0x7FFFFFFF));
+    // Compare with +infinity.
+    __ cmpl(result, Immediate(0x7FF00000));
+    __ j(NOT_EQUAL, &not_inf, Assembler::kNearJump);
+    __ LoadObject(result, Bool::True());
+    __ jmp(&done);
+
+    __ Bind(&not_inf);
+    __ LoadObject(result, Bool::False());
+    __ Bind(&done);
+    __ AddImmediate(ESP, Immediate(8));
+  }
+}
+
+
 LocationSummary* BinaryFloat32x4OpInstr::MakeLocationSummary(Zone* zone,
                                                              bool opt) const {
   const intptr_t kNumInputs = 2;