MIPS: Branch delay slot and other optimizations.

src/mips/debug-mips.cc

 // Copyright 2011 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 134 matching lines @@
           }
           __ sll(reg, reg, kSmiTagSize);
         }
       }
       __ MultiPush(object_regs | non_object_regs);
     }
 
 #ifdef DEBUG
     __ RecordComment("// Calling from debug break to runtime - come in - over");
 #endif
-    __ mov(a0, zero_reg);  // No arguments.
-    __ li(a1, Operand(ExternalReference::debug_break(masm->isolate())));
+    __ PrepareCEntryArgs(0);  // No arguments.
+    __ PrepareCEntryFunction(ExternalReference::debug_break(masm->isolate()));
 
     CEntryStub ceb(1);
     __ CallStub(&ceb);
 
     // Restore the register values from the expression stack.
     if ((object_regs | non_object_regs) != 0) {
       __ MultiPop(object_regs | non_object_regs);
       for (int i = 0; i < kNumJSCallerSaved; i++) {
         int r = JSCallerSavedCode(i);
         Register reg = { r };
@@ skipping 159 matching lines @@
 const bool Debug::kFrameDropperSupported = false;
 
 #undef __
 
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS