ARM: Load the heap number map into a register and keep it...

src/arm/full-codegen-arm.cc

 // Copyright 2009 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 2138 matching lines @@
   Apply(context_, r0);
 }
 
 
 void FullCodeGenerator::EmitRandomHeapNumber(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 0);
 
   Label slow_allocate_heapnumber;
   Label heapnumber_allocated;
 
-  __ AllocateHeapNumber(r4, r1, r2, &slow_allocate_heapnumber);
+  __ LoadRoot(r6, Heap::kHeapNumberMapRootIndex);
+  __ AllocateHeapNumber(r4, r1, r2, r6, &slow_allocate_heapnumber);
   __ jmp(&heapnumber_allocated);
 
   __ bind(&slow_allocate_heapnumber);
   // To allocate a heap number, and ensure that it is not a smi, we
   // call the runtime function FUnaryMinus on 0, returning the double
   // -0.0. A new, distinct heap number is returned each time.
   __ mov(r0, Operand(Smi::FromInt(0)));
   __ push(r0);
   __ CallRuntime(Runtime::kNumberUnaryMinus, 1);
   __ mov(r4, Operand(r0));
@@ skipping 980 matching lines @@
   __ mov(r1, Operand(r1, ASR, 1));  // Un-smi-tag value.
   __ add(pc, r1, Operand(masm_->CodeObject()));
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM