Fast elements conversions in crankshaft using generated code.

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index fa7cd119a6ccd1eb8f6799fa274e37574697088f..827cd3f3bd942f4da2d19b4895a9bc0c98bb1684 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -7203,7 +7203,7 @@ void FastElementsConversionStub::GenerateSmiOnlyToObject(MacroAssembler* masm) {
 
 
 void FastElementsConversionStub::GenerateSmiOnlyToDouble(
-    MacroAssembler* masm, StrictModeFlag strict_mode) {
+    MacroAssembler* masm, Type type, StrictModeFlag strict_mode) {
   // ----------- S t a t e -------------
   //  -- r0    : value
   //  -- r1    : key
@@ -7270,7 +7270,13 @@ void FastElementsConversionStub::GenerateSmiOnlyToDouble(
 
   // 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);
@@ -7308,11 +7314,16 @@ void FastElementsConversionStub::GenerateSmiOnlyToDouble(
   __ 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
@@ -7361,7 +7372,13 @@ void FastElementsConversionStub::GenerateDoubleToObject(
   __ 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));
@@ -7416,6 +7433,11 @@ void FastElementsConversionStub::GenerateDoubleToObject(
                       EMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
   __ pop(lr);
+
+  if (type == TRANSITION_ONLY) {
+    __ mov(r0, r2);
+    __ Ret();
+  }
 }