Using array index hash code for string-to-number conversion.

src/arm/codegen-arm.cc

 // Copyright 2010 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 5618 matching lines @@
   __ cmp(tmp, Operand(tmp2));
   __ b(ne, &done);
   __ ldr(tmp, FieldMemOperand(left, JSRegExp::kDataOffset));
   __ ldr(tmp2, FieldMemOperand(right, JSRegExp::kDataOffset));
   __ cmp(tmp, tmp2);
   __ bind(&done);
   cc_reg_ = eq;
 }
 
 
+void CodeGenerator::GenerateHasCachedArrayIndex(ZoneList<Expression*>* args) {
+  ASSERT(args->length() == 1);
+  Load(args->at(0));
+  Register value = frame_->PopToRegister();
+  Register tmp = frame_->scratch0();
+  __ ldr(tmp, FieldMemOperand(value, String::kHashFieldOffset));
+  __ tst(tmp, Operand(String::kContainsCachedArrayIndexMask));
+  cc_reg_ = eq;
+}
+
+
+void CodeGenerator::GenerateGetCachedArrayIndex(ZoneList<Expression*>* args) {
+  ASSERT(args->length() == 1);
+  Load(args->at(0));
+  Register value = frame_->PopToRegister();
+
+  __ ldr(value, FieldMemOperand(value, String::kHashFieldOffset));
+  __ IndexFromHash(value, value);
+  frame_->EmitPush(value);
+}
+
 
 void CodeGenerator::VisitCallRuntime(CallRuntime* node) {
 #ifdef DEBUG
   int original_height = frame_->height();
 #endif
   if (CheckForInlineRuntimeCall(node)) {
     ASSERT((has_cc() && frame_->height() == original_height) ||
            (!has_cc() && frame_->height() == original_height + 1));
     return;
   }
@@ skipping 1434 matching lines @@
                BinaryOpIC::GetName(runtime_operands_type_));
   return name_;
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM