ARM: Improve register allocation and constraints....

src/arm/frames-arm.h

 // Copyright 2006-2008 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 54 matching lines @@
   1 <<  5 |  //  r5 v2
   1 <<  6 |  //  r6 v3
   1 <<  7 |  //  r7 v4
   1 <<  8 |  //  r8 v5 (cp in JavaScript code)
   kR9Available <<  9 |  //  r9 v6
   1 << 10 |  // r10 v7
   1 << 11;   // r11 v8 (fp in JavaScript code)
 
 static const int kNumCalleeSaved = 7 + kR9Available;
 
+// Double registers d8 to d15 are callee-saved.
+static const int kNumDoubleCalleeSaved = 8;
 
 // Number of registers for which space is reserved in safepoints. Must be a
 // multiple of 8.
 // TODO(regis): Only 8 registers may actually be sufficient. Revisit.
 static const int kNumSafepointRegisters = 16;
 
 // Define the list of registers actually saved at safepoints.
 // Note that the number of saved registers may be smaller than the reserved
 // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters.
 static const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved;
@@ skipping 74 matching lines @@
 
 inline Object* JavaScriptFrame::function_slot_object() const {
   const int offset = JavaScriptFrameConstants::kFunctionOffset;
   return Memory::Object_at(fp() + offset);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_FRAMES_ARM_H_