__ add(src_elements, elements,
Operand(FixedDoubleArray::kHeaderSize - kHeapObjectTag + 4));
__ add(dst_elements, array, Operand(FixedArray::kHeaderSize));
- __ add(array, array, Operand(kHeapObjectTag));
__ add(dst_end, dst_elements, Operand(length, LSL, 1));
+
+ // Allocating heap numbers in the loop below can fail and cause a jump to
+ // gc_required. We can't leave a partly initialized FixedArray behind,
+ // so pessimistically fill it with holes now.
+ Label initialization_loop, initialization_loop_entry;
+ __ LoadRoot(scratch, Heap::kTheHoleValueRootIndex);
+ __ b(&initialization_loop_entry);
+ __ bind(&initialization_loop);
+ __ str(scratch, MemOperand(dst_elements, kPointerSize, PostIndex));
+ __ bind(&initialization_loop_entry);
+ __ cmp(dst_elements, dst_end);
+ __ b(lt, &initialization_loop);
+
+ __ add(dst_elements, array, Operand(FixedArray::kHeaderSize));
+ __ add(array, array, Operand(kHeapObjectTag));
__ LoadRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
// Using offsetted addresses in src_elements to fully take advantage of
// post-indexing.