Crankshaft support for FixedDoubleArrays

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 98667ce87e35070f7410da03248b62363a847a02..c62d7d470830c5908b563610b626d8da6a9856df 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -2245,10 +2245,35 @@ void LCodeGen::DoLoadKeyedFastElement(LLoadKeyedFastElement* instr) {
 }
 
 
-Operand LCodeGen::BuildExternalArrayOperand(
+void LCodeGen::DoLoadKeyedFastDoubleElement(
+    LLoadKeyedFastDoubleElement* instr) {
+  Register elements = ToRegister(instr->elements());
+  XMMRegister result(ToDoubleRegister(instr->result()));
+
+  if (instr->hydrogen()->RequiresHoleCheck()) {
+    int offset = FixedDoubleArray::kHeaderSize - kHeapObjectTag +
+        sizeof(kHoleNanLower32);
+    Operand hole_check_operand = BuildFastArrayOperand(
+        instr->elements(),
+        instr->key(),
+        JSObject::FAST_DOUBLE_ELEMENTS,
+        offset);
+    __ cmpl(hole_check_operand, Immediate(kHoleNanUpper32));
+    DeoptimizeIf(equal, instr->environment());
+  }
+
+  Operand double_load_operand = BuildFastArrayOperand(
+      instr->elements(), instr->key(), JSObject::FAST_DOUBLE_ELEMENTS,
+      FixedDoubleArray::kHeaderSize - kHeapObjectTag);
+  __ movsd(result, double_load_operand);
+}
+
+
+Operand LCodeGen::BuildFastArrayOperand(
     LOperand* external_pointer,
     LOperand* key,
-    JSObject::ElementsKind elements_kind) {
+    JSObject::ElementsKind elements_kind,
+    uint32_t offset) {
   Register external_pointer_reg = ToRegister(external_pointer);
   int shift_size = ElementsKindToShiftSize(elements_kind);
   if (key->IsConstantOperand()) {
@@ -2256,10 +2281,12 @@ Operand LCodeGen::BuildExternalArrayOperand(
     if (constant_value & 0xF0000000) {
       Abort("array index constant value too big");
     }
-    return Operand(external_pointer_reg, constant_value * (1 << shift_size));
+    return Operand(external_pointer_reg,
+                   constant_value * (1 << shift_size) + offset);
   } else {
     ScaleFactor scale_factor = static_cast<ScaleFactor>(shift_size);
-    return Operand(external_pointer_reg, ToRegister(key), scale_factor, 0);
+    return Operand(external_pointer_reg, ToRegister(key),
+                   scale_factor, offset);
   }
 }
 
@@ -2267,8 +2294,8 @@ Operand LCodeGen::BuildExternalArrayOperand(
 void LCodeGen::DoLoadKeyedSpecializedArrayElement(
     LLoadKeyedSpecializedArrayElement* instr) {
   JSObject::ElementsKind elements_kind = instr->elements_kind();
-  Operand operand(BuildExternalArrayOperand(instr->external_pointer(),
-                                            instr->key(), elements_kind));
+  Operand operand(BuildFastArrayOperand(instr->external_pointer(),
+                                        instr->key(), elements_kind, 0));
   if (elements_kind == JSObject::EXTERNAL_FLOAT_ELEMENTS) {
     XMMRegister result(ToDoubleRegister(instr->result()));
     __ movss(result, operand);
@@ -2994,8 +3021,8 @@ void LCodeGen::DoStoreNamedGeneric(LStoreNamedGeneric* instr) {
 void LCodeGen::DoStoreKeyedSpecializedArrayElement(
     LStoreKeyedSpecializedArrayElement* instr) {
   JSObject::ElementsKind elements_kind = instr->elements_kind();
-  Operand operand(BuildExternalArrayOperand(instr->external_pointer(),
-                                            instr->key(), elements_kind));
+  Operand operand(BuildFastArrayOperand(instr->external_pointer(),
+                                        instr->key(), elements_kind, 0));
   if (elements_kind == JSObject::EXTERNAL_FLOAT_ELEMENTS) {
     XMMRegister value(ToDoubleRegister(instr->value()));
     __ cvtsd2ss(value, value);
@@ -3072,6 +3099,28 @@ void LCodeGen::DoStoreKeyedFastElement(LStoreKeyedFastElement* instr) {
 }
 
 
+void LCodeGen::DoStoreKeyedFastDoubleElement(
+    LStoreKeyedFastDoubleElement* instr) {
+  XMMRegister value = ToDoubleRegister(instr->value());
+  Register elements = ToRegister(instr->elements());
+  Label have_value;
+
+  __ ucomisd(value, value);
+  __ j(parity_odd, &have_value);  // NaN.
+
+  ExternalReference canonical_nan_reference =
+      ExternalReference::address_of_canonical_non_hole_nan();
+  __ Set(kScratchRegister, BitCast<uint64_t>(
+      FixedDoubleArray::canonical_not_the_hole_nan_as_double()));
+  __ movq(value, kScratchRegister);
+
+  __ bind(&have_value);
+  Operand double_store_operand = BuildFastArrayOperand(
+      instr->elements(), instr->key(), JSObject::FAST_DOUBLE_ELEMENTS,
+      FixedDoubleArray::kHeaderSize - kHeapObjectTag);
+  __ movsd(double_store_operand, value);
+}
+
 void LCodeGen::DoStoreKeyedGeneric(LStoreKeyedGeneric* instr) {
   ASSERT(ToRegister(instr->object()).is(rdx));
   ASSERT(ToRegister(instr->key()).is(rcx));