Support array literals with FAST_DOUBLE_ELEMENTS ElementsKind.

src/x64/code-stubs-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 209 matching lines @@
 
 
 void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
   // Stack layout on entry:
   //
   // [rsp + kPointerSize]: constant elements.
   // [rsp + (2 * kPointerSize)]: literal index.
   // [rsp + (3 * kPointerSize)]: literals array.
 
   // All sizes here are multiples of kPointerSize.
-  int elements_size = (length_ > 0) ? FixedArray::SizeFor(length_) : 0;
+  int elements_size = 0;
+  if (length_ > 0) {
+    elements_size = mode_ == CLONE_DOUBLE_ELEMENTS
+        ? FixedDoubleArray::SizeFor(length_)
+        : FixedArray::SizeFor(length_);
+  }
   int size = JSArray::kSize + elements_size;
 
   // Load boilerplate object into rcx and check if we need to create a
   // boilerplate.
   Label slow_case;
   __ movq(rcx, Operand(rsp, 3 * kPointerSize));
   __ movq(rax, Operand(rsp, 2 * kPointerSize));
   SmiIndex index = masm->SmiToIndex(rax, rax, kPointerSizeLog2);
   __ movq(rcx,
           FieldOperand(rcx, index.reg, index.scale, FixedArray::kHeaderSize));
   __ CompareRoot(rcx, Heap::kUndefinedValueRootIndex);
   __ j(equal, &slow_case);
 
   if (FLAG_debug_code) {
     const char* message;
     Heap::RootListIndex expected_map_index;
     if (mode_ == CLONE_ELEMENTS) {
       message = "Expected (writable) fixed array";
       expected_map_index = Heap::kFixedArrayMapRootIndex;
+    } else if (mode_ == CLONE_DOUBLE_ELEMENTS) {
+      message = "Expected (writable) fixed double array";
+      expected_map_index = Heap::kFixedDoubleArrayMapRootIndex;
     } else {
       ASSERT(mode_ == COPY_ON_WRITE_ELEMENTS);
       message = "Expected copy-on-write fixed array";
       expected_map_index = Heap::kFixedCOWArrayMapRootIndex;
     }
     __ push(rcx);
     __ movq(rcx, FieldOperand(rcx, JSArray::kElementsOffset));
     __ CompareRoot(FieldOperand(rcx, HeapObject::kMapOffset),
                    expected_map_index);
     __ Assert(equal, message);
@@ skipping 13 matching lines @@
   }
 
   if (length_ > 0) {
     // Get hold of the elements array of the boilerplate and setup the
     // elements pointer in the resulting object.
     __ movq(rcx, FieldOperand(rcx, JSArray::kElementsOffset));
     __ lea(rdx, Operand(rax, JSArray::kSize));
     __ movq(FieldOperand(rax, JSArray::kElementsOffset), rdx);
 
     // Copy the elements array.
-    for (int i = 0; i < elements_size; i += kPointerSize) {
-      __ movq(rbx, FieldOperand(rcx, i));
-      __ movq(FieldOperand(rdx, i), rbx);
+    // Copy the elements array.
+    if (mode_ == CLONE_ELEMENTS) {
+      for (int i = 0; i < elements_size; i += kPointerSize) {
+        __ movq(rbx, FieldOperand(rcx, i));
+        __ movq(FieldOperand(rdx, i), rbx);
+      }
+    } else {
+      ASSERT(mode_ == CLONE_DOUBLE_ELEMENTS);
+      int i;
+      for (i = 0; i < FixedDoubleArray::kHeaderSize; i += kPointerSize) {
+        __ movq(rbx, FieldOperand(rcx, i));
+        __ movq(FieldOperand(rdx, i), rbx);
+      }
+      while (i < elements_size) {
+        __ movsd(xmm0, FieldOperand(rcx, i));
+        __ movsd(FieldOperand(rdx, i), xmm0);
+        i += kDoubleSize;
+      }
+      ASSERT(i == elements_size);
     }
   }
 
   // Return and remove the on-stack parameters.
   __ ret(3 * kPointerSize);
 
   __ bind(&slow_case);
   __ TailCallRuntime(Runtime::kCreateArrayLiteralShallow, 3, 1);
 }
 
@@ skipping 5796 matching lines @@
                       OMIT_SMI_CHECK);
   __ pop(rax);
   __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64