Fast elements conversions in crankshaft using generated code.

src/arm/code-stubs-arm.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 7185 matching lines @@
                       r3,
                       r9,
                       kLRHasNotBeenSaved,
                       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 -------------
   //  -- r0    : value
   //  -- r1    : key
   //  -- r2    : receiver
   //  -- lr    : return address
   //  -- r3    : target map, scratch for subsequent call
   //  -- r4    : scratch (elements)
   // -----------------------------------
   Label loop, entry, convert_hole, gc_required, fail;
   bool vfp3_supported = CpuFeatures::IsSupported(VFP3);
@@ skipping 46 matching lines @@
   // r4: kHoleNanLower32
   // r5: kHoleNanUpper32
   // r6: end of destination FixedDoubleArray, not tagged
   // r7: begin of FixedDoubleArray element fields, not tagged
   if (vfp3_supported) __ Push(r1, r0);
 
   __ b(&entry);
 
   // Call into runtime if GC is required.
   __ bind(&gc_required);
-  KeyedStoreIC::GenerateRuntimeSetProperty(masm, strict_mode);
+  if (type == TRANSITION_ONLY) {
+    __ push(r2);
+    __ TailCallRuntime(Runtime::kTransitionElementsSmiToDouble, 1, 1);
+  } else {
+    ASSERT(type == TRANSITION_AND_STORE);
+    KeyedStoreIC::GenerateRuntimeSetProperty(masm, strict_mode);
+  }
 
   // Convert and copy elements.
   __ bind(&loop);
   __ ldr(r9, MemOperand(r3, 4, PostIndex));
   // r9: current element
   __ JumpIfNotSmi(r9, &convert_hole);
 
   // Normal smi, convert to double and store.
   __ SmiUntag(r9);
   if (vfp3_supported) {
@@ skipping 17 matching lines @@
 
   // Hole found, store the-hole NaN.
   __ bind(&convert_hole);
   __ Strd(r4, r5, MemOperand(r7, 8, PostIndex));
 
   __ bind(&entry);
   __ cmp(r7, r6);
   __ b(lt, &loop);
 
   if (vfp3_supported) __ Pop(r1, r0);
+
+  if (type == TRANSITION_ONLY) {
+    __ mov(r0, r2);
+    __ Ret();
+  }
 }
 
 
 void FastElementsConversionStub::GenerateDoubleToObject(
-    MacroAssembler* masm, StrictModeFlag strict_mode) {
+    MacroAssembler* masm, Type type, StrictModeFlag strict_mode) {
   // ----------- S t a t e -------------
   //  -- r0    : value
   //  -- r1    : key
   //  -- r2    : receiver
   //  -- lr    : return address
   //  -- r3    : target map, scratch for subsequent call
   //  -- r4    : scratch (elements)
   // -----------------------------------
   Label entry, loop, convert_hole, gc_required;
 
@@ skipping 28 matching lines @@
   // r5: end of destination FixedArray, not tagged
   // r6: destination FixedArray
   // r7: the-hole pointer
   // r9: heap number map
   __ b(&entry);
 
   // Call into runtime if GC is required.
   __ bind(&gc_required);
   __ Pop(r3, r2, r1, r0);
   __ pop(lr);
-  KeyedStoreIC::GenerateRuntimeSetProperty(masm, strict_mode);
+  if (type == TRANSITION_ONLY) {
+    __ push(r2);
+    __ TailCallRuntime(Runtime::kTransitionElementsDoubleToObject, 1, 1);
+  } else {
+    ASSERT(type == TRANSITION_AND_STORE);
+    KeyedStoreIC::GenerateRuntimeSetProperty(masm, strict_mode);
+  }
 
   __ bind(&loop);
   __ ldr(r1, MemOperand(r4, 8, PostIndex));
   // lr: current element's upper 32 bit
   // r4: address of next element's upper 32 bit
   __ cmp(r1, Operand(kHoleNanUpper32));
   __ b(eq, &convert_hole);
 
   // Non-hole double, copy value into a heap number.
   __ AllocateHeapNumber(r2, r0, lr, r9, &gc_required);
@@ skipping 34 matching lines @@
   __ str(r6, FieldMemOperand(r2, JSObject::kElementsOffset));
   __ RecordWriteField(r2,
                       JSObject::kElementsOffset,
                       r6,
                       r9,
                       kLRHasBeenSaved,
                       kDontSaveFPRegs,
                       EMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
   __ pop(lr);
+
+  if (type == TRANSITION_ONLY) {
+    __ mov(r0, r2);
+    __ Ret();
+  }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM