Support array literals with FAST_DOUBLE_ELEMENTS ElementsKind.

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 7a1967e0ccb71af533fd4c4843339aff2432dd30..fe1641c374bc769d2bbb1bde13d2b6a5e2ec1e56 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -239,7 +239,12 @@ void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
   // [esp + (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 ecx and check if we need to create a
@@ -262,6 +267,9 @@ void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
     if (mode_ == CLONE_ELEMENTS) {
       message = "Expected (writable) fixed array";
       expected_map = factory->fixed_array_map();
+    } else if (mode_ == CLONE_DOUBLE_ELEMENTS) {
+      message = "Expected (writable) fixed double array";
+      expected_map = factory->fixed_double_array_map();
     } else {
       ASSERT(mode_ == COPY_ON_WRITE_ELEMENTS);
       message = "Expected copy-on-write fixed array";
@@ -294,9 +302,24 @@ void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
     __ mov(FieldOperand(eax, JSArray::kElementsOffset), edx);
 
     // Copy the elements array.
-    for (int i = 0; i < elements_size; i += kPointerSize) {
-      __ mov(ebx, FieldOperand(ecx, i));
-      __ mov(FieldOperand(edx, i), ebx);
+    if (mode_ == CLONE_ELEMENTS) {
+      for (int i = 0; i < elements_size; i += kPointerSize) {
+        __ mov(ebx, FieldOperand(ecx, i));
+        __ mov(FieldOperand(edx, i), ebx);
+      }
+    } else {
+      ASSERT(mode_ == CLONE_DOUBLE_ELEMENTS);
+      int i;
+      for (i = 0; i < FixedDoubleArray::kHeaderSize; i += kPointerSize) {
+        __ mov(ebx, FieldOperand(ecx, i));
+        __ mov(FieldOperand(edx, i), ebx);
+      }
+      while (i < elements_size) {
+        __ fld_d(FieldOperand(ecx, i));
+        __ fstp_d(FieldOperand(edx, i));
+        i += kDoubleSize;
+      }
+      ASSERT(i == elements_size);
     }
   }