Fast elements conversions in crankshaft using generated code.

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 5945 matching lines @@
                       HeapObject::kMapOffset,
                       rbx,
                       rdi,
                       kDontSaveFPRegs,
                       EMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
 }
 
 
 void FastElementsConversionStub::GenerateSmiOnlyToDouble(
-    MacroAssembler* masm, StrictModeFlag strict_mode) {
+    MacroAssembler* masm, Type type, StrictModeFlag strict_mode) {
   // ----------- S t a t e -------------
   //  -- rax    : value
   //  -- rbx    : target map
   //  -- rcx    : key
   //  -- rdx    : receiver
   //  -- rsp[0] : return address
   // -----------------------------------
   // Set transitioned map.
   __ movq(FieldOperand(rdx, HeapObject::kMapOffset), rbx);
   __ RecordWriteField(rdx,
@@ skipping 29 matching lines @@
   __ SmiToInteger32(rbx, rbx);
   __ cvtlsi2sd(xmm0, rbx);
   __ movsd(FieldOperand(r8, r9, times_8, FixedDoubleArray::kHeaderSize),
            xmm0);
   __ jmp(&entry);
   __ bind(&convert_hole);
   __ movq(FieldOperand(r8, r9, times_8, FixedDoubleArray::kHeaderSize), r15);
   __ bind(&entry);
   __ testq(r9, r9);
   __ j(not_zero, &loop);
+
+  if (type == TRANSITION_ONLY) {
+    __ movq(rax, rdx);
+    __ Ret();
+  }
 }
 
 
 void FastElementsConversionStub::GenerateDoubleToObject(
-    MacroAssembler* masm, StrictModeFlag strict_mode) {
+    MacroAssembler* masm, Type type, StrictModeFlag strict_mode) {
   // ----------- S t a t e -------------
   //  -- rax    : value
   //  -- rbx    : target map
   //  -- rcx    : key
   //  -- rdx    : receiver
   //  -- rsp[0] : return address
   // -----------------------------------
   Label loop, entry, convert_hole, gc_required;
   __ push(rax);
 
@@ skipping 13 matching lines @@
   __ movq(rsi, BitCast<int64_t, uint64_t>(kHoleNanInt64), RelocInfo::NONE);
   __ LoadRoot(rdi, Heap::kTheHoleValueRootIndex);
   // rsi: the-hole NaN
   // rdi: pointer to the-hole
   __ jmp(&entry);
 
   // Call into runtime if GC is required.
   __ bind(&gc_required);
   __ pop(rax);
   __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
-  KeyedStoreIC::GenerateRuntimeSetProperty(masm, strict_mode);
+  if (type == TRANSITION_ONLY) {
+    __ pop(rbx);
+    __ push(rdx);
+    __ push(rbx);  // return address
+    __ TailCallRuntime(Runtime::kTransitionElementsDoubleToObject, 1, 1);
+  } else {
+    ASSERT(type == TRANSITION_AND_STORE);
+    KeyedStoreIC::GenerateRuntimeSetProperty(masm, strict_mode);
+  }
 
   // Box doubles into heap numbers.
   __ bind(&loop);
   __ decq(r9);
   __ movq(r14, FieldOperand(r8,
                             r9,
                             times_pointer_size,
                             FixedDoubleArray::kHeaderSize));
   // r9 : current element's index
   // r14: current element
@@ skipping 43 matching lines @@
   __ movq(FieldOperand(rdx, JSObject::kElementsOffset), rax);
   __ RecordWriteField(rdx,
                       JSObject::kElementsOffset,
                       rax,
                       rdi,
                       kDontSaveFPRegs,
                       EMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
   __ pop(rax);
   __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
+
+  if (type == TRANSITION_ONLY) {
+    __ movq(rax, rdx);
+    __ Ret();
+  }
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64