Fix for an ARM register allocation bug.

src/arm/assembler-arm.h

Index: src/arm/assembler-arm.h
diff --git a/src/arm/assembler-arm.h b/src/arm/assembler-arm.h
index 247479d730b834aaae5612374ea680274c759e44..cc74d17034506803c0cca19bd53e29b73e493b3e 100644
--- a/src/arm/assembler-arm.h
+++ b/src/arm/assembler-arm.h
@@ -32,7 +32,7 @@
 
 // The original source code covered by the above license above has been
 // modified significantly by Google Inc.
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 
 // A light-weight ARM Assembler
 // Generates user mode instructions for the ARM architecture up to version 5
@@ -177,13 +177,13 @@ struct DwVfpRegister {
       kNumReservedRegisters;
 
   static int ToAllocationIndex(DwVfpRegister reg) {
-    ASSERT(reg.code() != 0);
-    return reg.code() - 1;
+    ASSERT(reg.code() != 14 && reg.code() != 15);

[Vyacheslav Egorov (Chromium), 2012/01/10 15:28:27]

I don't like this magic constants a bit.

+    return reg.code();
   }
 
   static DwVfpRegister FromAllocationIndex(int index) {
     ASSERT(index >= 0 && index < kNumAllocatableRegisters);
-    return from_code(index + 1);
+    return from_code(index);
   }
 
   static const char* AllocationIndexToString(int index) {