Fast elements conversions in crankshaft using generated code.

src/ia32/code-stubs-ia32.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 7026 matching lines @@
                       HeapObject::kMapOffset,
                       ebx,
                       edi,
                       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 -------------
   //  -- eax    : value
   //  -- ebx    : target map
   //  -- ecx    : key
   //  -- edx    : receiver
   //  -- esp[0] : return address
   // -----------------------------------
   Label loop, entry, convert_hole, gc_required;
   __ push(eax);
   __ push(ebx);
@@ skipping 37 matching lines @@
               Operand::StaticVariable(canonical_the_hole_nan_reference));
   }
   __ jmp(&entry);
 
   // Call into runtime if GC is required.
   __ bind(&gc_required);
   // Restore registers before jumping into runtime.
   __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
   __ pop(ebx);
   __ pop(eax);
-  KeyedStoreIC::GenerateRuntimeSetProperty(masm, strict_mode);
+  if (type == TRANSITION_ONLY) {
+    __ pop(ebx);
+    __ push(edx);
+    __ push(ebx);  // return address
+    __ TailCallRuntime(Runtime::kTransitionElementsSmiToDouble, 1, 1);
+  } else {
+    ASSERT(type == TRANSITION_AND_STORE);
+    KeyedStoreIC::GenerateRuntimeSetProperty(masm, strict_mode);
+  }
 
   // Convert and copy elements
   // esi: source FixedArray
   // edi: number of elements to convert/copy
   __ bind(&loop);
   __ sub(edi, Immediate(Smi::FromInt(1)));
   __ mov(ebx, FieldOperand(esi, edi, times_2, FixedArray::kHeaderSize));
   // ebx: current element from source
   // edi: index of current element
   __ JumpIfNotSmi(ebx, &convert_hole);
@@ skipping 36 matching lines @@
   __ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx);
   __ RecordWriteField(edx,
                       HeapObject::kMapOffset,
                       ebx,
                       edi,
                       kDontSaveFPRegs,
                       EMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
   // Restore esi.
   __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
+
+  if (type == TRANSITION_ONLY) {
+    __ mov(eax, edx);
+    __ Ret();
+  }
 }
 
 
 void FastElementsConversionStub::GenerateDoubleToObject(
-    MacroAssembler* masm, StrictModeFlag strict_mode) {
+    MacroAssembler* masm, Type type, StrictModeFlag strict_mode) {
   // ----------- S t a t e -------------
   //  -- eax    : value
   //  -- ebx    : target map
   //  -- ecx    : key
   //  -- edx    : receiver
   //  -- esp[0] : return address
   // -----------------------------------
   Label loop, entry, convert_hole, gc_required;
   __ push(eax);
   __ push(edx);
@@ skipping 15 matching lines @@
   __ mov(edi, FieldOperand(edx, JSObject::kElementsOffset));
 
   __ jmp(&entry);
 
   // Call into runtime if GC is required.
   __ bind(&gc_required);
   __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
   __ pop(ebx);
   __ pop(edx);
   __ pop(eax);
-  KeyedStoreIC::GenerateRuntimeSetProperty(masm, strict_mode);
-
+  if (type == TRANSITION_ONLY) {
+    __ pop(ebx);
+    __ push(edx);
+    __ push(ebx);  // return address
+    __ TailCallRuntime(Runtime::kTransitionElementsDoubleToObject, 1, 1);
+  } else {
+    ASSERT(type == TRANSITION_AND_STORE);
+    KeyedStoreIC::GenerateRuntimeSetProperty(masm, strict_mode);
+  }
   // Box doubles into heap numbers.
   // edi: source FixedDoubleArray
   // eax: destination FixedArray
   __ bind(&loop);
   __ sub(ebx, Immediate(Smi::FromInt(1)));
   // ebx: index of current element (smi-tagged)
   uint32_t offset = FixedDoubleArray::kHeaderSize + sizeof(kHoleNanLower32);
   __ cmp(FieldOperand(edi, ebx, times_4, offset), Immediate(kHoleNanUpper32));
   __ j(equal, &convert_hole);
 
@@ skipping 49 matching lines @@
                       JSObject::kElementsOffset,
                       eax,
                       edi,
                       kDontSaveFPRegs,
                       EMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
 
   // Restore registers.
   __ pop(eax);
   __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
+
+  if (type == TRANSITION_ONLY) {
+    __ mov(eax, edx);
+    __ Ret();
+  }
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32