Porting r9392 to arm (smi-only arrays).

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index 8068da48628b9362862c926aa564506267d5f5c3..6c9bfefb96947ecc8a2b4e14dc1a401bcc3e593b 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -1504,15 +1504,25 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
     VisitForAccumulatorValue(subexpr);
 
     // Store the subexpression value in the array's elements.
-    __ ldr(r1, MemOperand(sp));  // Copy of array literal.
-    __ ldr(r1, FieldMemOperand(r1, JSObject::kElementsOffset));
+    __ ldr(r6, MemOperand(sp));  // Copy of array literal.
+    __ ldr(r1, FieldMemOperand(r6, JSObject::kElementsOffset));
     int offset = FixedArray::kHeaderSize + (i * kPointerSize);
     __ str(result_register(), FieldMemOperand(r1, offset));
 
+    Label no_map_change;
+    __ JumpIfSmi(result_register(), &no_map_change);
     // Update the write barrier for the array store with r0 as the scratch
     // register.
     __ RecordWriteField(
-        r1, offset, result_register(), r2, kLRHasBeenSaved, kDontSaveFPRegs);
+        r1, offset, result_register(), r2, kLRHasBeenSaved, kDontSaveFPRegs,
+        EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
+    if (FLAG_smi_only_arrays) {
+      __ ldr(r3, FieldMemOperand(r1, HeapObject::kMapOffset));
+      __ CheckFastSmiOnlyElements(r3, r2, &no_map_change);
+      __ push(r6);

[Rico, 2011/09/22 17:06:07]

maybe a comment here:
__ push(r6);  // Copy of array literal

+      __ CallRuntime(Runtime::kNonSmiElementStored, 1);
+    }
+    __ bind(&no_map_change);
 
     PrepareForBailoutForId(expr->GetIdForElement(i), NO_REGISTERS);
   }